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3921 lines
105 KiB
3921 lines
105 KiB
/* |
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* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. |
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* Copyright (C) 2008 - 2011 Bart Van Assche <[email protected]>. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/ctype.h> |
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#include <linux/kthread.h> |
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#include <linux/string.h> |
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#include <linux/delay.h> |
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#include <linux/atomic.h> |
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#include <linux/inet.h> |
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#include <rdma/ib_cache.h> |
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#include <scsi/scsi_proto.h> |
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#include <scsi/scsi_tcq.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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#include "ib_srpt.h" |
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|
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/* Name of this kernel module. */ |
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#define DRV_NAME "ib_srpt" |
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|
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#define SRPT_ID_STRING "Linux SRP target" |
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|
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#undef pr_fmt |
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#define pr_fmt(fmt) DRV_NAME " " fmt |
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|
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MODULE_AUTHOR("Vu Pham and Bart Van Assche"); |
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MODULE_DESCRIPTION("SCSI RDMA Protocol target driver"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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|
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/* |
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* Global Variables |
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*/ |
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|
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static u64 srpt_service_guid; |
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static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */ |
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static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */ |
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|
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static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE; |
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module_param(srp_max_req_size, int, 0444); |
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MODULE_PARM_DESC(srp_max_req_size, |
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"Maximum size of SRP request messages in bytes."); |
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|
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static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE; |
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module_param(srpt_srq_size, int, 0444); |
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MODULE_PARM_DESC(srpt_srq_size, |
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"Shared receive queue (SRQ) size."); |
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|
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static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp) |
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{ |
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return sprintf(buffer, "0x%016llx\n", *(u64 *)kp->arg); |
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} |
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module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid, |
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0444); |
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MODULE_PARM_DESC(srpt_service_guid, |
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"Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA."); |
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|
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static struct ib_client srpt_client; |
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/* Protects both rdma_cm_port and rdma_cm_id. */ |
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static DEFINE_MUTEX(rdma_cm_mutex); |
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/* Port number RDMA/CM will bind to. */ |
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static u16 rdma_cm_port; |
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static struct rdma_cm_id *rdma_cm_id; |
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static void srpt_release_cmd(struct se_cmd *se_cmd); |
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static void srpt_free_ch(struct kref *kref); |
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static int srpt_queue_status(struct se_cmd *cmd); |
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static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
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static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc); |
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static void srpt_process_wait_list(struct srpt_rdma_ch *ch); |
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|
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/* |
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* The only allowed channel state changes are those that change the channel |
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* state into a state with a higher numerical value. Hence the new > prev test. |
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*/ |
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static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new) |
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{ |
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unsigned long flags; |
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enum rdma_ch_state prev; |
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bool changed = false; |
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|
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spin_lock_irqsave(&ch->spinlock, flags); |
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prev = ch->state; |
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if (new > prev) { |
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ch->state = new; |
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changed = true; |
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} |
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spin_unlock_irqrestore(&ch->spinlock, flags); |
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|
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return changed; |
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} |
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|
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/** |
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* srpt_event_handler - asynchronous IB event callback function |
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* @handler: IB event handler registered by ib_register_event_handler(). |
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* @event: Description of the event that occurred. |
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* |
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* Callback function called by the InfiniBand core when an asynchronous IB |
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* event occurs. This callback may occur in interrupt context. See also |
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* section 11.5.2, Set Asynchronous Event Handler in the InfiniBand |
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* Architecture Specification. |
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*/ |
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static void srpt_event_handler(struct ib_event_handler *handler, |
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struct ib_event *event) |
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{ |
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struct srpt_device *sdev = |
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container_of(handler, struct srpt_device, event_handler); |
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struct srpt_port *sport; |
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u8 port_num; |
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|
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pr_debug("ASYNC event= %d on device= %s\n", event->event, |
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dev_name(&sdev->device->dev)); |
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|
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switch (event->event) { |
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case IB_EVENT_PORT_ERR: |
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port_num = event->element.port_num - 1; |
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if (port_num < sdev->device->phys_port_cnt) { |
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sport = &sdev->port[port_num]; |
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sport->lid = 0; |
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sport->sm_lid = 0; |
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} else { |
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WARN(true, "event %d: port_num %d out of range 1..%d\n", |
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event->event, port_num + 1, |
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sdev->device->phys_port_cnt); |
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} |
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break; |
|
case IB_EVENT_PORT_ACTIVE: |
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case IB_EVENT_LID_CHANGE: |
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case IB_EVENT_PKEY_CHANGE: |
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case IB_EVENT_SM_CHANGE: |
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case IB_EVENT_CLIENT_REREGISTER: |
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case IB_EVENT_GID_CHANGE: |
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/* Refresh port data asynchronously. */ |
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port_num = event->element.port_num - 1; |
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if (port_num < sdev->device->phys_port_cnt) { |
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sport = &sdev->port[port_num]; |
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if (!sport->lid && !sport->sm_lid) |
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schedule_work(&sport->work); |
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} else { |
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WARN(true, "event %d: port_num %d out of range 1..%d\n", |
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event->event, port_num + 1, |
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sdev->device->phys_port_cnt); |
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} |
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break; |
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default: |
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pr_err("received unrecognized IB event %d\n", event->event); |
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break; |
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} |
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} |
|
|
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/** |
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* srpt_srq_event - SRQ event callback function |
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* @event: Description of the event that occurred. |
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* @ctx: Context pointer specified at SRQ creation time. |
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*/ |
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static void srpt_srq_event(struct ib_event *event, void *ctx) |
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{ |
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pr_debug("SRQ event %d\n", event->event); |
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} |
|
|
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static const char *get_ch_state_name(enum rdma_ch_state s) |
|
{ |
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switch (s) { |
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case CH_CONNECTING: |
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return "connecting"; |
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case CH_LIVE: |
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return "live"; |
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case CH_DISCONNECTING: |
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return "disconnecting"; |
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case CH_DRAINING: |
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return "draining"; |
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case CH_DISCONNECTED: |
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return "disconnected"; |
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} |
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return "???"; |
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} |
|
|
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/** |
|
* srpt_qp_event - QP event callback function |
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* @event: Description of the event that occurred. |
|
* @ch: SRPT RDMA channel. |
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*/ |
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static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) |
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{ |
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pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n", |
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event->event, ch, ch->sess_name, ch->qp->qp_num, |
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get_ch_state_name(ch->state)); |
|
|
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switch (event->event) { |
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case IB_EVENT_COMM_EST: |
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if (ch->using_rdma_cm) |
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rdma_notify(ch->rdma_cm.cm_id, event->event); |
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else |
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ib_cm_notify(ch->ib_cm.cm_id, event->event); |
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break; |
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case IB_EVENT_QP_LAST_WQE_REACHED: |
|
pr_debug("%s-%d, state %s: received Last WQE event.\n", |
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ch->sess_name, ch->qp->qp_num, |
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get_ch_state_name(ch->state)); |
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break; |
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default: |
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pr_err("received unrecognized IB QP event %d\n", event->event); |
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break; |
|
} |
|
} |
|
|
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/** |
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* srpt_set_ioc - initialize a IOUnitInfo structure |
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* @c_list: controller list. |
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* @slot: one-based slot number. |
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* @value: four-bit value. |
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* |
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* Copies the lowest four bits of value in element slot of the array of four |
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* bit elements called c_list (controller list). The index slot is one-based. |
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*/ |
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static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) |
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{ |
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u16 id; |
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u8 tmp; |
|
|
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id = (slot - 1) / 2; |
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if (slot & 0x1) { |
|
tmp = c_list[id] & 0xf; |
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c_list[id] = (value << 4) | tmp; |
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} else { |
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tmp = c_list[id] & 0xf0; |
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c_list[id] = (value & 0xf) | tmp; |
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} |
|
} |
|
|
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/** |
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* srpt_get_class_port_info - copy ClassPortInfo to a management datagram |
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* @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO. |
|
* |
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* See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture |
|
* Specification. |
|
*/ |
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static void srpt_get_class_port_info(struct ib_dm_mad *mad) |
|
{ |
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struct ib_class_port_info *cif; |
|
|
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cif = (struct ib_class_port_info *)mad->data; |
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memset(cif, 0, sizeof(*cif)); |
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cif->base_version = 1; |
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cif->class_version = 1; |
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|
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ib_set_cpi_resp_time(cif, 20); |
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mad->mad_hdr.status = 0; |
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} |
|
|
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/** |
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* srpt_get_iou - write IOUnitInfo to a management datagram |
|
* @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO. |
|
* |
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* See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture |
|
* Specification. See also section B.7, table B.6 in the SRP r16a document. |
|
*/ |
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static void srpt_get_iou(struct ib_dm_mad *mad) |
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{ |
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struct ib_dm_iou_info *ioui; |
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u8 slot; |
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int i; |
|
|
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ioui = (struct ib_dm_iou_info *)mad->data; |
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ioui->change_id = cpu_to_be16(1); |
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ioui->max_controllers = 16; |
|
|
|
/* set present for slot 1 and empty for the rest */ |
|
srpt_set_ioc(ioui->controller_list, 1, 1); |
|
for (i = 1, slot = 2; i < 16; i++, slot++) |
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srpt_set_ioc(ioui->controller_list, slot, 0); |
|
|
|
mad->mad_hdr.status = 0; |
|
} |
|
|
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/** |
|
* srpt_get_ioc - write IOControllerprofile to a management datagram |
|
* @sport: HCA port through which the MAD has been received. |
|
* @slot: Slot number specified in DM_ATTR_IOC_PROFILE query. |
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* @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE. |
|
* |
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* See also section 16.3.3.4 IOControllerProfile in the InfiniBand |
|
* Architecture Specification. See also section B.7, table B.7 in the SRP |
|
* r16a document. |
|
*/ |
|
static void srpt_get_ioc(struct srpt_port *sport, u32 slot, |
|
struct ib_dm_mad *mad) |
|
{ |
|
struct srpt_device *sdev = sport->sdev; |
|
struct ib_dm_ioc_profile *iocp; |
|
int send_queue_depth; |
|
|
|
iocp = (struct ib_dm_ioc_profile *)mad->data; |
|
|
|
if (!slot || slot > 16) { |
|
mad->mad_hdr.status |
|
= cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
|
return; |
|
} |
|
|
|
if (slot > 2) { |
|
mad->mad_hdr.status |
|
= cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
|
return; |
|
} |
|
|
|
if (sdev->use_srq) |
|
send_queue_depth = sdev->srq_size; |
|
else |
|
send_queue_depth = min(MAX_SRPT_RQ_SIZE, |
|
sdev->device->attrs.max_qp_wr); |
|
|
|
memset(iocp, 0, sizeof(*iocp)); |
|
strcpy(iocp->id_string, SRPT_ID_STRING); |
|
iocp->guid = cpu_to_be64(srpt_service_guid); |
|
iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
|
iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id); |
|
iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver); |
|
iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
|
iocp->subsys_device_id = 0x0; |
|
iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
|
iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); |
|
iocp->protocol = cpu_to_be16(SRP_PROTOCOL); |
|
iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); |
|
iocp->send_queue_depth = cpu_to_be16(send_queue_depth); |
|
iocp->rdma_read_depth = 4; |
|
iocp->send_size = cpu_to_be32(srp_max_req_size); |
|
iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, |
|
1U << 24)); |
|
iocp->num_svc_entries = 1; |
|
iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | |
|
SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; |
|
|
|
mad->mad_hdr.status = 0; |
|
} |
|
|
|
/** |
|
* srpt_get_svc_entries - write ServiceEntries to a management datagram |
|
* @ioc_guid: I/O controller GUID to use in reply. |
|
* @slot: I/O controller number. |
|
* @hi: End of the range of service entries to be specified in the reply. |
|
* @lo: Start of the range of service entries to be specified in the reply.. |
|
* @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES. |
|
* |
|
* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture |
|
* Specification. See also section B.7, table B.8 in the SRP r16a document. |
|
*/ |
|
static void srpt_get_svc_entries(u64 ioc_guid, |
|
u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) |
|
{ |
|
struct ib_dm_svc_entries *svc_entries; |
|
|
|
WARN_ON(!ioc_guid); |
|
|
|
if (!slot || slot > 16) { |
|
mad->mad_hdr.status |
|
= cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
|
return; |
|
} |
|
|
|
if (slot > 2 || lo > hi || hi > 1) { |
|
mad->mad_hdr.status |
|
= cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
|
return; |
|
} |
|
|
|
svc_entries = (struct ib_dm_svc_entries *)mad->data; |
|
memset(svc_entries, 0, sizeof(*svc_entries)); |
|
svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
|
snprintf(svc_entries->service_entries[0].name, |
|
sizeof(svc_entries->service_entries[0].name), |
|
"%s%016llx", |
|
SRP_SERVICE_NAME_PREFIX, |
|
ioc_guid); |
|
|
|
mad->mad_hdr.status = 0; |
|
} |
|
|
|
/** |
|
* srpt_mgmt_method_get - process a received management datagram |
|
* @sp: HCA port through which the MAD has been received. |
|
* @rq_mad: received MAD. |
|
* @rsp_mad: response MAD. |
|
*/ |
|
static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, |
|
struct ib_dm_mad *rsp_mad) |
|
{ |
|
u16 attr_id; |
|
u32 slot; |
|
u8 hi, lo; |
|
|
|
attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); |
|
switch (attr_id) { |
|
case DM_ATTR_CLASS_PORT_INFO: |
|
srpt_get_class_port_info(rsp_mad); |
|
break; |
|
case DM_ATTR_IOU_INFO: |
|
srpt_get_iou(rsp_mad); |
|
break; |
|
case DM_ATTR_IOC_PROFILE: |
|
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); |
|
srpt_get_ioc(sp, slot, rsp_mad); |
|
break; |
|
case DM_ATTR_SVC_ENTRIES: |
|
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); |
|
hi = (u8) ((slot >> 8) & 0xff); |
|
lo = (u8) (slot & 0xff); |
|
slot = (u16) ((slot >> 16) & 0xffff); |
|
srpt_get_svc_entries(srpt_service_guid, |
|
slot, hi, lo, rsp_mad); |
|
break; |
|
default: |
|
rsp_mad->mad_hdr.status = |
|
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
|
break; |
|
} |
|
} |
|
|
|
/** |
|
* srpt_mad_send_handler - MAD send completion callback |
|
* @mad_agent: Return value of ib_register_mad_agent(). |
|
* @mad_wc: Work completion reporting that the MAD has been sent. |
|
*/ |
|
static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, |
|
struct ib_mad_send_wc *mad_wc) |
|
{ |
|
rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE); |
|
ib_free_send_mad(mad_wc->send_buf); |
|
} |
|
|
|
/** |
|
* srpt_mad_recv_handler - MAD reception callback function |
|
* @mad_agent: Return value of ib_register_mad_agent(). |
|
* @send_buf: Not used. |
|
* @mad_wc: Work completion reporting that a MAD has been received. |
|
*/ |
|
static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, |
|
struct ib_mad_send_buf *send_buf, |
|
struct ib_mad_recv_wc *mad_wc) |
|
{ |
|
struct srpt_port *sport = (struct srpt_port *)mad_agent->context; |
|
struct ib_ah *ah; |
|
struct ib_mad_send_buf *rsp; |
|
struct ib_dm_mad *dm_mad; |
|
|
|
if (!mad_wc || !mad_wc->recv_buf.mad) |
|
return; |
|
|
|
ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, |
|
mad_wc->recv_buf.grh, mad_agent->port_num); |
|
if (IS_ERR(ah)) |
|
goto err; |
|
|
|
BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); |
|
|
|
rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, |
|
mad_wc->wc->pkey_index, 0, |
|
IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, |
|
GFP_KERNEL, |
|
IB_MGMT_BASE_VERSION); |
|
if (IS_ERR(rsp)) |
|
goto err_rsp; |
|
|
|
rsp->ah = ah; |
|
|
|
dm_mad = rsp->mad; |
|
memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
|
dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
|
dm_mad->mad_hdr.status = 0; |
|
|
|
switch (mad_wc->recv_buf.mad->mad_hdr.method) { |
|
case IB_MGMT_METHOD_GET: |
|
srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); |
|
break; |
|
case IB_MGMT_METHOD_SET: |
|
dm_mad->mad_hdr.status = |
|
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
|
break; |
|
default: |
|
dm_mad->mad_hdr.status = |
|
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
|
break; |
|
} |
|
|
|
if (!ib_post_send_mad(rsp, NULL)) { |
|
ib_free_recv_mad(mad_wc); |
|
/* will destroy_ah & free_send_mad in send completion */ |
|
return; |
|
} |
|
|
|
ib_free_send_mad(rsp); |
|
|
|
err_rsp: |
|
rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); |
|
err: |
|
ib_free_recv_mad(mad_wc); |
|
} |
|
|
|
static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid) |
|
{ |
|
const __be16 *g = (const __be16 *)guid; |
|
|
|
return snprintf(buf, size, "%04x:%04x:%04x:%04x", |
|
be16_to_cpu(g[0]), be16_to_cpu(g[1]), |
|
be16_to_cpu(g[2]), be16_to_cpu(g[3])); |
|
} |
|
|
|
/** |
|
* srpt_refresh_port - configure a HCA port |
|
* @sport: SRPT HCA port. |
|
* |
|
* Enable InfiniBand management datagram processing, update the cached sm_lid, |
|
* lid and gid values, and register a callback function for processing MADs |
|
* on the specified port. |
|
* |
|
* Note: It is safe to call this function more than once for the same port. |
|
*/ |
|
static int srpt_refresh_port(struct srpt_port *sport) |
|
{ |
|
struct ib_mad_reg_req reg_req; |
|
struct ib_port_modify port_modify; |
|
struct ib_port_attr port_attr; |
|
int ret; |
|
|
|
ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); |
|
if (ret) |
|
return ret; |
|
|
|
sport->sm_lid = port_attr.sm_lid; |
|
sport->lid = port_attr.lid; |
|
|
|
ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid); |
|
if (ret) |
|
return ret; |
|
|
|
sport->port_guid_id.wwn.priv = sport; |
|
srpt_format_guid(sport->port_guid_id.name, |
|
sizeof(sport->port_guid_id.name), |
|
&sport->gid.global.interface_id); |
|
sport->port_gid_id.wwn.priv = sport; |
|
snprintf(sport->port_gid_id.name, sizeof(sport->port_gid_id.name), |
|
"0x%016llx%016llx", |
|
be64_to_cpu(sport->gid.global.subnet_prefix), |
|
be64_to_cpu(sport->gid.global.interface_id)); |
|
|
|
if (rdma_protocol_iwarp(sport->sdev->device, sport->port)) |
|
return 0; |
|
|
|
memset(&port_modify, 0, sizeof(port_modify)); |
|
port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
|
port_modify.clr_port_cap_mask = 0; |
|
|
|
ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); |
|
if (ret) { |
|
pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n", |
|
dev_name(&sport->sdev->device->dev), sport->port, ret); |
|
return 0; |
|
} |
|
|
|
if (!sport->mad_agent) { |
|
memset(®_req, 0, sizeof(reg_req)); |
|
reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
|
reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; |
|
set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); |
|
set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); |
|
|
|
sport->mad_agent = ib_register_mad_agent(sport->sdev->device, |
|
sport->port, |
|
IB_QPT_GSI, |
|
®_req, 0, |
|
srpt_mad_send_handler, |
|
srpt_mad_recv_handler, |
|
sport, 0); |
|
if (IS_ERR(sport->mad_agent)) { |
|
pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n", |
|
dev_name(&sport->sdev->device->dev), sport->port, |
|
PTR_ERR(sport->mad_agent)); |
|
sport->mad_agent = NULL; |
|
memset(&port_modify, 0, sizeof(port_modify)); |
|
port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
|
ib_modify_port(sport->sdev->device, sport->port, 0, |
|
&port_modify); |
|
|
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* srpt_unregister_mad_agent - unregister MAD callback functions |
|
* @sdev: SRPT HCA pointer. |
|
* @port_cnt: number of ports with registered MAD |
|
* |
|
* Note: It is safe to call this function more than once for the same device. |
|
*/ |
|
static void srpt_unregister_mad_agent(struct srpt_device *sdev, int port_cnt) |
|
{ |
|
struct ib_port_modify port_modify = { |
|
.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, |
|
}; |
|
struct srpt_port *sport; |
|
int i; |
|
|
|
for (i = 1; i <= port_cnt; i++) { |
|
sport = &sdev->port[i - 1]; |
|
WARN_ON(sport->port != i); |
|
if (sport->mad_agent) { |
|
ib_modify_port(sdev->device, i, 0, &port_modify); |
|
ib_unregister_mad_agent(sport->mad_agent); |
|
sport->mad_agent = NULL; |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* srpt_alloc_ioctx - allocate a SRPT I/O context structure |
|
* @sdev: SRPT HCA pointer. |
|
* @ioctx_size: I/O context size. |
|
* @buf_cache: I/O buffer cache. |
|
* @dir: DMA data direction. |
|
*/ |
|
static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, |
|
int ioctx_size, |
|
struct kmem_cache *buf_cache, |
|
enum dma_data_direction dir) |
|
{ |
|
struct srpt_ioctx *ioctx; |
|
|
|
ioctx = kzalloc(ioctx_size, GFP_KERNEL); |
|
if (!ioctx) |
|
goto err; |
|
|
|
ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL); |
|
if (!ioctx->buf) |
|
goto err_free_ioctx; |
|
|
|
ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, |
|
kmem_cache_size(buf_cache), dir); |
|
if (ib_dma_mapping_error(sdev->device, ioctx->dma)) |
|
goto err_free_buf; |
|
|
|
return ioctx; |
|
|
|
err_free_buf: |
|
kmem_cache_free(buf_cache, ioctx->buf); |
|
err_free_ioctx: |
|
kfree(ioctx); |
|
err: |
|
return NULL; |
|
} |
|
|
|
/** |
|
* srpt_free_ioctx - free a SRPT I/O context structure |
|
* @sdev: SRPT HCA pointer. |
|
* @ioctx: I/O context pointer. |
|
* @buf_cache: I/O buffer cache. |
|
* @dir: DMA data direction. |
|
*/ |
|
static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, |
|
struct kmem_cache *buf_cache, |
|
enum dma_data_direction dir) |
|
{ |
|
if (!ioctx) |
|
return; |
|
|
|
ib_dma_unmap_single(sdev->device, ioctx->dma, |
|
kmem_cache_size(buf_cache), dir); |
|
kmem_cache_free(buf_cache, ioctx->buf); |
|
kfree(ioctx); |
|
} |
|
|
|
/** |
|
* srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures |
|
* @sdev: Device to allocate the I/O context ring for. |
|
* @ring_size: Number of elements in the I/O context ring. |
|
* @ioctx_size: I/O context size. |
|
* @buf_cache: I/O buffer cache. |
|
* @alignment_offset: Offset in each ring buffer at which the SRP information |
|
* unit starts. |
|
* @dir: DMA data direction. |
|
*/ |
|
static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, |
|
int ring_size, int ioctx_size, |
|
struct kmem_cache *buf_cache, |
|
int alignment_offset, |
|
enum dma_data_direction dir) |
|
{ |
|
struct srpt_ioctx **ring; |
|
int i; |
|
|
|
WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) && |
|
ioctx_size != sizeof(struct srpt_send_ioctx)); |
|
|
|
ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL); |
|
if (!ring) |
|
goto out; |
|
for (i = 0; i < ring_size; ++i) { |
|
ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir); |
|
if (!ring[i]) |
|
goto err; |
|
ring[i]->index = i; |
|
ring[i]->offset = alignment_offset; |
|
} |
|
goto out; |
|
|
|
err: |
|
while (--i >= 0) |
|
srpt_free_ioctx(sdev, ring[i], buf_cache, dir); |
|
kvfree(ring); |
|
ring = NULL; |
|
out: |
|
return ring; |
|
} |
|
|
|
/** |
|
* srpt_free_ioctx_ring - free the ring of SRPT I/O context structures |
|
* @ioctx_ring: I/O context ring to be freed. |
|
* @sdev: SRPT HCA pointer. |
|
* @ring_size: Number of ring elements. |
|
* @buf_cache: I/O buffer cache. |
|
* @dir: DMA data direction. |
|
*/ |
|
static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, |
|
struct srpt_device *sdev, int ring_size, |
|
struct kmem_cache *buf_cache, |
|
enum dma_data_direction dir) |
|
{ |
|
int i; |
|
|
|
if (!ioctx_ring) |
|
return; |
|
|
|
for (i = 0; i < ring_size; ++i) |
|
srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir); |
|
kvfree(ioctx_ring); |
|
} |
|
|
|
/** |
|
* srpt_set_cmd_state - set the state of a SCSI command |
|
* @ioctx: Send I/O context. |
|
* @new: New I/O context state. |
|
* |
|
* Does not modify the state of aborted commands. Returns the previous command |
|
* state. |
|
*/ |
|
static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, |
|
enum srpt_command_state new) |
|
{ |
|
enum srpt_command_state previous; |
|
|
|
previous = ioctx->state; |
|
if (previous != SRPT_STATE_DONE) |
|
ioctx->state = new; |
|
|
|
return previous; |
|
} |
|
|
|
/** |
|
* srpt_test_and_set_cmd_state - test and set the state of a command |
|
* @ioctx: Send I/O context. |
|
* @old: Current I/O context state. |
|
* @new: New I/O context state. |
|
* |
|
* Returns true if and only if the previous command state was equal to 'old'. |
|
*/ |
|
static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, |
|
enum srpt_command_state old, |
|
enum srpt_command_state new) |
|
{ |
|
enum srpt_command_state previous; |
|
|
|
WARN_ON(!ioctx); |
|
WARN_ON(old == SRPT_STATE_DONE); |
|
WARN_ON(new == SRPT_STATE_NEW); |
|
|
|
previous = ioctx->state; |
|
if (previous == old) |
|
ioctx->state = new; |
|
|
|
return previous == old; |
|
} |
|
|
|
/** |
|
* srpt_post_recv - post an IB receive request |
|
* @sdev: SRPT HCA pointer. |
|
* @ch: SRPT RDMA channel. |
|
* @ioctx: Receive I/O context pointer. |
|
*/ |
|
static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch, |
|
struct srpt_recv_ioctx *ioctx) |
|
{ |
|
struct ib_sge list; |
|
struct ib_recv_wr wr; |
|
|
|
BUG_ON(!sdev); |
|
list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset; |
|
list.length = srp_max_req_size; |
|
list.lkey = sdev->lkey; |
|
|
|
ioctx->ioctx.cqe.done = srpt_recv_done; |
|
wr.wr_cqe = &ioctx->ioctx.cqe; |
|
wr.next = NULL; |
|
wr.sg_list = &list; |
|
wr.num_sge = 1; |
|
|
|
if (sdev->use_srq) |
|
return ib_post_srq_recv(sdev->srq, &wr, NULL); |
|
else |
|
return ib_post_recv(ch->qp, &wr, NULL); |
|
} |
|
|
|
/** |
|
* srpt_zerolength_write - perform a zero-length RDMA write |
|
* @ch: SRPT RDMA channel. |
|
* |
|
* A quote from the InfiniBand specification: C9-88: For an HCA responder |
|
* using Reliable Connection service, for each zero-length RDMA READ or WRITE |
|
* request, the R_Key shall not be validated, even if the request includes |
|
* Immediate data. |
|
*/ |
|
static int srpt_zerolength_write(struct srpt_rdma_ch *ch) |
|
{ |
|
struct ib_rdma_wr wr = { |
|
.wr = { |
|
.next = NULL, |
|
{ .wr_cqe = &ch->zw_cqe, }, |
|
.opcode = IB_WR_RDMA_WRITE, |
|
.send_flags = IB_SEND_SIGNALED, |
|
} |
|
}; |
|
|
|
pr_debug("%s-%d: queued zerolength write\n", ch->sess_name, |
|
ch->qp->qp_num); |
|
|
|
return ib_post_send(ch->qp, &wr.wr, NULL); |
|
} |
|
|
|
static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct srpt_rdma_ch *ch = wc->qp->qp_context; |
|
|
|
pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num, |
|
wc->status); |
|
|
|
if (wc->status == IB_WC_SUCCESS) { |
|
srpt_process_wait_list(ch); |
|
} else { |
|
if (srpt_set_ch_state(ch, CH_DISCONNECTED)) |
|
schedule_work(&ch->release_work); |
|
else |
|
pr_debug("%s-%d: already disconnected.\n", |
|
ch->sess_name, ch->qp->qp_num); |
|
} |
|
} |
|
|
|
static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx, |
|
struct srp_direct_buf *db, int nbufs, struct scatterlist **sg, |
|
unsigned *sg_cnt) |
|
{ |
|
enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); |
|
struct srpt_rdma_ch *ch = ioctx->ch; |
|
struct scatterlist *prev = NULL; |
|
unsigned prev_nents; |
|
int ret, i; |
|
|
|
if (nbufs == 1) { |
|
ioctx->rw_ctxs = &ioctx->s_rw_ctx; |
|
} else { |
|
ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs), |
|
GFP_KERNEL); |
|
if (!ioctx->rw_ctxs) |
|
return -ENOMEM; |
|
} |
|
|
|
for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) { |
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; |
|
u64 remote_addr = be64_to_cpu(db->va); |
|
u32 size = be32_to_cpu(db->len); |
|
u32 rkey = be32_to_cpu(db->key); |
|
|
|
ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false, |
|
i < nbufs - 1); |
|
if (ret) |
|
goto unwind; |
|
|
|
ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port, |
|
ctx->sg, ctx->nents, 0, remote_addr, rkey, dir); |
|
if (ret < 0) { |
|
target_free_sgl(ctx->sg, ctx->nents); |
|
goto unwind; |
|
} |
|
|
|
ioctx->n_rdma += ret; |
|
ioctx->n_rw_ctx++; |
|
|
|
if (prev) { |
|
sg_unmark_end(&prev[prev_nents - 1]); |
|
sg_chain(prev, prev_nents + 1, ctx->sg); |
|
} else { |
|
*sg = ctx->sg; |
|
} |
|
|
|
prev = ctx->sg; |
|
prev_nents = ctx->nents; |
|
|
|
*sg_cnt += ctx->nents; |
|
} |
|
|
|
return 0; |
|
|
|
unwind: |
|
while (--i >= 0) { |
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; |
|
|
|
rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, |
|
ctx->sg, ctx->nents, dir); |
|
target_free_sgl(ctx->sg, ctx->nents); |
|
} |
|
if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) |
|
kfree(ioctx->rw_ctxs); |
|
return ret; |
|
} |
|
|
|
static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch, |
|
struct srpt_send_ioctx *ioctx) |
|
{ |
|
enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); |
|
int i; |
|
|
|
for (i = 0; i < ioctx->n_rw_ctx; i++) { |
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; |
|
|
|
rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, |
|
ctx->sg, ctx->nents, dir); |
|
target_free_sgl(ctx->sg, ctx->nents); |
|
} |
|
|
|
if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) |
|
kfree(ioctx->rw_ctxs); |
|
} |
|
|
|
static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd) |
|
{ |
|
/* |
|
* The pointer computations below will only be compiled correctly |
|
* if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check |
|
* whether srp_cmd::add_data has been declared as a byte pointer. |
|
*/ |
|
BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) && |
|
!__same_type(srp_cmd->add_data[0], (u8)0)); |
|
|
|
/* |
|
* According to the SRP spec, the lower two bits of the 'ADDITIONAL |
|
* CDB LENGTH' field are reserved and the size in bytes of this field |
|
* is four times the value specified in bits 3..7. Hence the "& ~3". |
|
*/ |
|
return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3); |
|
} |
|
|
|
/** |
|
* srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request |
|
* @recv_ioctx: I/O context associated with the received command @srp_cmd. |
|
* @ioctx: I/O context that will be used for responding to the initiator. |
|
* @srp_cmd: Pointer to the SRP_CMD request data. |
|
* @dir: Pointer to the variable to which the transfer direction will be |
|
* written. |
|
* @sg: [out] scatterlist for the parsed SRP_CMD. |
|
* @sg_cnt: [out] length of @sg. |
|
* @data_len: Pointer to the variable to which the total data length of all |
|
* descriptors in the SRP_CMD request will be written. |
|
* @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data |
|
* starts. |
|
* |
|
* This function initializes ioctx->nrbuf and ioctx->r_bufs. |
|
* |
|
* Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; |
|
* -ENOMEM when memory allocation fails and zero upon success. |
|
*/ |
|
static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx, |
|
struct srpt_send_ioctx *ioctx, |
|
struct srp_cmd *srp_cmd, enum dma_data_direction *dir, |
|
struct scatterlist **sg, unsigned int *sg_cnt, u64 *data_len, |
|
u16 imm_data_offset) |
|
{ |
|
BUG_ON(!dir); |
|
BUG_ON(!data_len); |
|
|
|
/* |
|
* The lower four bits of the buffer format field contain the DATA-IN |
|
* buffer descriptor format, and the highest four bits contain the |
|
* DATA-OUT buffer descriptor format. |
|
*/ |
|
if (srp_cmd->buf_fmt & 0xf) |
|
/* DATA-IN: transfer data from target to initiator (read). */ |
|
*dir = DMA_FROM_DEVICE; |
|
else if (srp_cmd->buf_fmt >> 4) |
|
/* DATA-OUT: transfer data from initiator to target (write). */ |
|
*dir = DMA_TO_DEVICE; |
|
else |
|
*dir = DMA_NONE; |
|
|
|
/* initialize data_direction early as srpt_alloc_rw_ctxs needs it */ |
|
ioctx->cmd.data_direction = *dir; |
|
|
|
if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || |
|
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { |
|
struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd); |
|
|
|
*data_len = be32_to_cpu(db->len); |
|
return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt); |
|
} else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || |
|
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { |
|
struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd); |
|
int nbufs = be32_to_cpu(idb->table_desc.len) / |
|
sizeof(struct srp_direct_buf); |
|
|
|
if (nbufs > |
|
(srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { |
|
pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n", |
|
srp_cmd->data_out_desc_cnt, |
|
srp_cmd->data_in_desc_cnt, |
|
be32_to_cpu(idb->table_desc.len), |
|
sizeof(struct srp_direct_buf)); |
|
return -EINVAL; |
|
} |
|
|
|
*data_len = be32_to_cpu(idb->len); |
|
return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs, |
|
sg, sg_cnt); |
|
} else if ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_IMM) { |
|
struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd); |
|
void *data = (void *)srp_cmd + imm_data_offset; |
|
uint32_t len = be32_to_cpu(imm_buf->len); |
|
uint32_t req_size = imm_data_offset + len; |
|
|
|
if (req_size > srp_max_req_size) { |
|
pr_err("Immediate data (length %d + %d) exceeds request size %d\n", |
|
imm_data_offset, len, srp_max_req_size); |
|
return -EINVAL; |
|
} |
|
if (recv_ioctx->byte_len < req_size) { |
|
pr_err("Received too few data - %d < %d\n", |
|
recv_ioctx->byte_len, req_size); |
|
return -EIO; |
|
} |
|
/* |
|
* The immediate data buffer descriptor must occur before the |
|
* immediate data itself. |
|
*/ |
|
if ((void *)(imm_buf + 1) > (void *)data) { |
|
pr_err("Received invalid write request\n"); |
|
return -EINVAL; |
|
} |
|
*data_len = len; |
|
ioctx->recv_ioctx = recv_ioctx; |
|
if ((uintptr_t)data & 511) { |
|
pr_warn_once("Internal error - the receive buffers are not aligned properly.\n"); |
|
return -EINVAL; |
|
} |
|
sg_init_one(&ioctx->imm_sg, data, len); |
|
*sg = &ioctx->imm_sg; |
|
*sg_cnt = 1; |
|
return 0; |
|
} else { |
|
*data_len = 0; |
|
return 0; |
|
} |
|
} |
|
|
|
/** |
|
* srpt_init_ch_qp - initialize queue pair attributes |
|
* @ch: SRPT RDMA channel. |
|
* @qp: Queue pair pointer. |
|
* |
|
* Initialized the attributes of queue pair 'qp' by allowing local write, |
|
* remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. |
|
*/ |
|
static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
|
{ |
|
struct ib_qp_attr *attr; |
|
int ret; |
|
|
|
WARN_ON_ONCE(ch->using_rdma_cm); |
|
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
|
if (!attr) |
|
return -ENOMEM; |
|
|
|
attr->qp_state = IB_QPS_INIT; |
|
attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
|
attr->port_num = ch->sport->port; |
|
|
|
ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port, |
|
ch->pkey, &attr->pkey_index); |
|
if (ret < 0) |
|
pr_err("Translating pkey %#x failed (%d) - using index 0\n", |
|
ch->pkey, ret); |
|
|
|
ret = ib_modify_qp(qp, attr, |
|
IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | |
|
IB_QP_PKEY_INDEX); |
|
|
|
kfree(attr); |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR) |
|
* @ch: channel of the queue pair. |
|
* @qp: queue pair to change the state of. |
|
* |
|
* Returns zero upon success and a negative value upon failure. |
|
* |
|
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. |
|
* If this structure ever becomes larger, it might be necessary to allocate |
|
* it dynamically instead of on the stack. |
|
*/ |
|
static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
|
{ |
|
struct ib_qp_attr qp_attr; |
|
int attr_mask; |
|
int ret; |
|
|
|
WARN_ON_ONCE(ch->using_rdma_cm); |
|
|
|
qp_attr.qp_state = IB_QPS_RTR; |
|
ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
|
if (ret) |
|
goto out; |
|
|
|
qp_attr.max_dest_rd_atomic = 4; |
|
|
|
ret = ib_modify_qp(qp, &qp_attr, attr_mask); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS) |
|
* @ch: channel of the queue pair. |
|
* @qp: queue pair to change the state of. |
|
* |
|
* Returns zero upon success and a negative value upon failure. |
|
* |
|
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. |
|
* If this structure ever becomes larger, it might be necessary to allocate |
|
* it dynamically instead of on the stack. |
|
*/ |
|
static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) |
|
{ |
|
struct ib_qp_attr qp_attr; |
|
int attr_mask; |
|
int ret; |
|
|
|
qp_attr.qp_state = IB_QPS_RTS; |
|
ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
|
if (ret) |
|
goto out; |
|
|
|
qp_attr.max_rd_atomic = 4; |
|
|
|
ret = ib_modify_qp(qp, &qp_attr, attr_mask); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_ch_qp_err - set the channel queue pair state to 'error' |
|
* @ch: SRPT RDMA channel. |
|
*/ |
|
static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) |
|
{ |
|
struct ib_qp_attr qp_attr; |
|
|
|
qp_attr.qp_state = IB_QPS_ERR; |
|
return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); |
|
} |
|
|
|
/** |
|
* srpt_get_send_ioctx - obtain an I/O context for sending to the initiator |
|
* @ch: SRPT RDMA channel. |
|
*/ |
|
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) |
|
{ |
|
struct srpt_send_ioctx *ioctx; |
|
int tag, cpu; |
|
|
|
BUG_ON(!ch); |
|
|
|
tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu); |
|
if (tag < 0) |
|
return NULL; |
|
|
|
ioctx = ch->ioctx_ring[tag]; |
|
BUG_ON(ioctx->ch != ch); |
|
ioctx->state = SRPT_STATE_NEW; |
|
WARN_ON_ONCE(ioctx->recv_ioctx); |
|
ioctx->n_rdma = 0; |
|
ioctx->n_rw_ctx = 0; |
|
ioctx->queue_status_only = false; |
|
/* |
|
* transport_init_se_cmd() does not initialize all fields, so do it |
|
* here. |
|
*/ |
|
memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); |
|
memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); |
|
ioctx->cmd.map_tag = tag; |
|
ioctx->cmd.map_cpu = cpu; |
|
|
|
return ioctx; |
|
} |
|
|
|
/** |
|
* srpt_abort_cmd - abort a SCSI command |
|
* @ioctx: I/O context associated with the SCSI command. |
|
*/ |
|
static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) |
|
{ |
|
enum srpt_command_state state; |
|
|
|
BUG_ON(!ioctx); |
|
|
|
/* |
|
* If the command is in a state where the target core is waiting for |
|
* the ib_srpt driver, change the state to the next state. |
|
*/ |
|
|
|
state = ioctx->state; |
|
switch (state) { |
|
case SRPT_STATE_NEED_DATA: |
|
ioctx->state = SRPT_STATE_DATA_IN; |
|
break; |
|
case SRPT_STATE_CMD_RSP_SENT: |
|
case SRPT_STATE_MGMT_RSP_SENT: |
|
ioctx->state = SRPT_STATE_DONE; |
|
break; |
|
default: |
|
WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
|
__func__, state); |
|
break; |
|
} |
|
|
|
pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state, |
|
ioctx->state, ioctx->cmd.tag); |
|
|
|
switch (state) { |
|
case SRPT_STATE_NEW: |
|
case SRPT_STATE_DATA_IN: |
|
case SRPT_STATE_MGMT: |
|
case SRPT_STATE_DONE: |
|
/* |
|
* Do nothing - defer abort processing until |
|
* srpt_queue_response() is invoked. |
|
*/ |
|
break; |
|
case SRPT_STATE_NEED_DATA: |
|
pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
|
transport_generic_request_failure(&ioctx->cmd, |
|
TCM_CHECK_CONDITION_ABORT_CMD); |
|
break; |
|
case SRPT_STATE_CMD_RSP_SENT: |
|
/* |
|
* SRP_RSP sending failed or the SRP_RSP send completion has |
|
* not been received in time. |
|
*/ |
|
transport_generic_free_cmd(&ioctx->cmd, 0); |
|
break; |
|
case SRPT_STATE_MGMT_RSP_SENT: |
|
transport_generic_free_cmd(&ioctx->cmd, 0); |
|
break; |
|
default: |
|
WARN(1, "Unexpected command state (%d)", state); |
|
break; |
|
} |
|
|
|
return state; |
|
} |
|
|
|
/** |
|
* srpt_rdma_read_done - RDMA read completion callback |
|
* @cq: Completion queue. |
|
* @wc: Work completion. |
|
* |
|
* XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
|
* the data that has been transferred via IB RDMA had to be postponed until the |
|
* check_stop_free() callback. None of this is necessary anymore and needs to |
|
* be cleaned up. |
|
*/ |
|
static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct srpt_rdma_ch *ch = wc->qp->qp_context; |
|
struct srpt_send_ioctx *ioctx = |
|
container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
|
|
|
WARN_ON(ioctx->n_rdma <= 0); |
|
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); |
|
ioctx->n_rdma = 0; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", |
|
ioctx, wc->status); |
|
srpt_abort_cmd(ioctx); |
|
return; |
|
} |
|
|
|
if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, |
|
SRPT_STATE_DATA_IN)) |
|
target_execute_cmd(&ioctx->cmd); |
|
else |
|
pr_err("%s[%d]: wrong state = %d\n", __func__, |
|
__LINE__, ioctx->state); |
|
} |
|
|
|
/** |
|
* srpt_build_cmd_rsp - build a SRP_RSP response |
|
* @ch: RDMA channel through which the request has been received. |
|
* @ioctx: I/O context associated with the SRP_CMD request. The response will |
|
* be built in the buffer ioctx->buf points at and hence this function will |
|
* overwrite the request data. |
|
* @tag: tag of the request for which this response is being generated. |
|
* @status: value for the STATUS field of the SRP_RSP information unit. |
|
* |
|
* Returns the size in bytes of the SRP_RSP response. |
|
* |
|
* An SRP_RSP response contains a SCSI status or service response. See also |
|
* section 6.9 in the SRP r16a document for the format of an SRP_RSP |
|
* response. See also SPC-2 for more information about sense data. |
|
*/ |
|
static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, |
|
struct srpt_send_ioctx *ioctx, u64 tag, |
|
int status) |
|
{ |
|
struct se_cmd *cmd = &ioctx->cmd; |
|
struct srp_rsp *srp_rsp; |
|
const u8 *sense_data; |
|
int sense_data_len, max_sense_len; |
|
u32 resid = cmd->residual_count; |
|
|
|
/* |
|
* The lowest bit of all SAM-3 status codes is zero (see also |
|
* paragraph 5.3 in SAM-3). |
|
*/ |
|
WARN_ON(status & 1); |
|
|
|
srp_rsp = ioctx->ioctx.buf; |
|
BUG_ON(!srp_rsp); |
|
|
|
sense_data = ioctx->sense_data; |
|
sense_data_len = ioctx->cmd.scsi_sense_length; |
|
WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); |
|
|
|
memset(srp_rsp, 0, sizeof(*srp_rsp)); |
|
srp_rsp->opcode = SRP_RSP; |
|
srp_rsp->req_lim_delta = |
|
cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
|
srp_rsp->tag = tag; |
|
srp_rsp->status = status; |
|
|
|
if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
|
if (cmd->data_direction == DMA_TO_DEVICE) { |
|
/* residual data from an underflow write */ |
|
srp_rsp->flags = SRP_RSP_FLAG_DOUNDER; |
|
srp_rsp->data_out_res_cnt = cpu_to_be32(resid); |
|
} else if (cmd->data_direction == DMA_FROM_DEVICE) { |
|
/* residual data from an underflow read */ |
|
srp_rsp->flags = SRP_RSP_FLAG_DIUNDER; |
|
srp_rsp->data_in_res_cnt = cpu_to_be32(resid); |
|
} |
|
} else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { |
|
if (cmd->data_direction == DMA_TO_DEVICE) { |
|
/* residual data from an overflow write */ |
|
srp_rsp->flags = SRP_RSP_FLAG_DOOVER; |
|
srp_rsp->data_out_res_cnt = cpu_to_be32(resid); |
|
} else if (cmd->data_direction == DMA_FROM_DEVICE) { |
|
/* residual data from an overflow read */ |
|
srp_rsp->flags = SRP_RSP_FLAG_DIOVER; |
|
srp_rsp->data_in_res_cnt = cpu_to_be32(resid); |
|
} |
|
} |
|
|
|
if (sense_data_len) { |
|
BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); |
|
max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); |
|
if (sense_data_len > max_sense_len) { |
|
pr_warn("truncated sense data from %d to %d bytes\n", |
|
sense_data_len, max_sense_len); |
|
sense_data_len = max_sense_len; |
|
} |
|
|
|
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; |
|
srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); |
|
memcpy(srp_rsp + 1, sense_data, sense_data_len); |
|
} |
|
|
|
return sizeof(*srp_rsp) + sense_data_len; |
|
} |
|
|
|
/** |
|
* srpt_build_tskmgmt_rsp - build a task management response |
|
* @ch: RDMA channel through which the request has been received. |
|
* @ioctx: I/O context in which the SRP_RSP response will be built. |
|
* @rsp_code: RSP_CODE that will be stored in the response. |
|
* @tag: Tag of the request for which this response is being generated. |
|
* |
|
* Returns the size in bytes of the SRP_RSP response. |
|
* |
|
* An SRP_RSP response contains a SCSI status or service response. See also |
|
* section 6.9 in the SRP r16a document for the format of an SRP_RSP |
|
* response. |
|
*/ |
|
static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, |
|
struct srpt_send_ioctx *ioctx, |
|
u8 rsp_code, u64 tag) |
|
{ |
|
struct srp_rsp *srp_rsp; |
|
int resp_data_len; |
|
int resp_len; |
|
|
|
resp_data_len = 4; |
|
resp_len = sizeof(*srp_rsp) + resp_data_len; |
|
|
|
srp_rsp = ioctx->ioctx.buf; |
|
BUG_ON(!srp_rsp); |
|
memset(srp_rsp, 0, sizeof(*srp_rsp)); |
|
|
|
srp_rsp->opcode = SRP_RSP; |
|
srp_rsp->req_lim_delta = |
|
cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
|
srp_rsp->tag = tag; |
|
|
|
srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
|
srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); |
|
srp_rsp->data[3] = rsp_code; |
|
|
|
return resp_len; |
|
} |
|
|
|
static int srpt_check_stop_free(struct se_cmd *cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx = container_of(cmd, |
|
struct srpt_send_ioctx, cmd); |
|
|
|
return target_put_sess_cmd(&ioctx->cmd); |
|
} |
|
|
|
/** |
|
* srpt_handle_cmd - process a SRP_CMD information unit |
|
* @ch: SRPT RDMA channel. |
|
* @recv_ioctx: Receive I/O context. |
|
* @send_ioctx: Send I/O context. |
|
*/ |
|
static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
|
struct srpt_recv_ioctx *recv_ioctx, |
|
struct srpt_send_ioctx *send_ioctx) |
|
{ |
|
struct se_cmd *cmd; |
|
struct srp_cmd *srp_cmd; |
|
struct scatterlist *sg = NULL; |
|
unsigned sg_cnt = 0; |
|
u64 data_len; |
|
enum dma_data_direction dir; |
|
int rc; |
|
|
|
BUG_ON(!send_ioctx); |
|
|
|
srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
|
cmd = &send_ioctx->cmd; |
|
cmd->tag = srp_cmd->tag; |
|
|
|
switch (srp_cmd->task_attr) { |
|
case SRP_CMD_SIMPLE_Q: |
|
cmd->sam_task_attr = TCM_SIMPLE_TAG; |
|
break; |
|
case SRP_CMD_ORDERED_Q: |
|
default: |
|
cmd->sam_task_attr = TCM_ORDERED_TAG; |
|
break; |
|
case SRP_CMD_HEAD_OF_Q: |
|
cmd->sam_task_attr = TCM_HEAD_TAG; |
|
break; |
|
case SRP_CMD_ACA: |
|
cmd->sam_task_attr = TCM_ACA_TAG; |
|
break; |
|
} |
|
|
|
rc = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir, |
|
&sg, &sg_cnt, &data_len, ch->imm_data_offset); |
|
if (rc) { |
|
if (rc != -EAGAIN) { |
|
pr_err("0x%llx: parsing SRP descriptor table failed.\n", |
|
srp_cmd->tag); |
|
} |
|
goto busy; |
|
} |
|
|
|
rc = target_init_cmd(cmd, ch->sess, &send_ioctx->sense_data[0], |
|
scsilun_to_int(&srp_cmd->lun), data_len, |
|
TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF); |
|
if (rc != 0) { |
|
pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
|
srp_cmd->tag); |
|
goto busy; |
|
} |
|
|
|
if (target_submit_prep(cmd, srp_cmd->cdb, sg, sg_cnt, NULL, 0, NULL, 0, |
|
GFP_KERNEL)) |
|
return; |
|
|
|
target_submit(cmd); |
|
return; |
|
|
|
busy: |
|
target_send_busy(cmd); |
|
} |
|
|
|
static int srp_tmr_to_tcm(int fn) |
|
{ |
|
switch (fn) { |
|
case SRP_TSK_ABORT_TASK: |
|
return TMR_ABORT_TASK; |
|
case SRP_TSK_ABORT_TASK_SET: |
|
return TMR_ABORT_TASK_SET; |
|
case SRP_TSK_CLEAR_TASK_SET: |
|
return TMR_CLEAR_TASK_SET; |
|
case SRP_TSK_LUN_RESET: |
|
return TMR_LUN_RESET; |
|
case SRP_TSK_CLEAR_ACA: |
|
return TMR_CLEAR_ACA; |
|
default: |
|
return -1; |
|
} |
|
} |
|
|
|
/** |
|
* srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit |
|
* @ch: SRPT RDMA channel. |
|
* @recv_ioctx: Receive I/O context. |
|
* @send_ioctx: Send I/O context. |
|
* |
|
* Returns 0 if and only if the request will be processed by the target core. |
|
* |
|
* For more information about SRP_TSK_MGMT information units, see also section |
|
* 6.7 in the SRP r16a document. |
|
*/ |
|
static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, |
|
struct srpt_recv_ioctx *recv_ioctx, |
|
struct srpt_send_ioctx *send_ioctx) |
|
{ |
|
struct srp_tsk_mgmt *srp_tsk; |
|
struct se_cmd *cmd; |
|
struct se_session *sess = ch->sess; |
|
int tcm_tmr; |
|
int rc; |
|
|
|
BUG_ON(!send_ioctx); |
|
|
|
srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
|
cmd = &send_ioctx->cmd; |
|
|
|
pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n", |
|
srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch, |
|
ch->sess); |
|
|
|
srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); |
|
send_ioctx->cmd.tag = srp_tsk->tag; |
|
tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
|
rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
|
scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, |
|
GFP_KERNEL, srp_tsk->task_tag, |
|
TARGET_SCF_ACK_KREF); |
|
if (rc != 0) { |
|
send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; |
|
cmd->se_tfo->queue_tm_rsp(cmd); |
|
} |
|
return; |
|
} |
|
|
|
/** |
|
* srpt_handle_new_iu - process a newly received information unit |
|
* @ch: RDMA channel through which the information unit has been received. |
|
* @recv_ioctx: Receive I/O context associated with the information unit. |
|
*/ |
|
static bool |
|
srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx) |
|
{ |
|
struct srpt_send_ioctx *send_ioctx = NULL; |
|
struct srp_cmd *srp_cmd; |
|
bool res = false; |
|
u8 opcode; |
|
|
|
BUG_ON(!ch); |
|
BUG_ON(!recv_ioctx); |
|
|
|
if (unlikely(ch->state == CH_CONNECTING)) |
|
goto push; |
|
|
|
ib_dma_sync_single_for_cpu(ch->sport->sdev->device, |
|
recv_ioctx->ioctx.dma, |
|
recv_ioctx->ioctx.offset + srp_max_req_size, |
|
DMA_FROM_DEVICE); |
|
|
|
srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset; |
|
opcode = srp_cmd->opcode; |
|
if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) { |
|
send_ioctx = srpt_get_send_ioctx(ch); |
|
if (unlikely(!send_ioctx)) |
|
goto push; |
|
} |
|
|
|
if (!list_empty(&recv_ioctx->wait_list)) { |
|
WARN_ON_ONCE(!ch->processing_wait_list); |
|
list_del_init(&recv_ioctx->wait_list); |
|
} |
|
|
|
switch (opcode) { |
|
case SRP_CMD: |
|
srpt_handle_cmd(ch, recv_ioctx, send_ioctx); |
|
break; |
|
case SRP_TSK_MGMT: |
|
srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); |
|
break; |
|
case SRP_I_LOGOUT: |
|
pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
|
break; |
|
case SRP_CRED_RSP: |
|
pr_debug("received SRP_CRED_RSP\n"); |
|
break; |
|
case SRP_AER_RSP: |
|
pr_debug("received SRP_AER_RSP\n"); |
|
break; |
|
case SRP_RSP: |
|
pr_err("Received SRP_RSP\n"); |
|
break; |
|
default: |
|
pr_err("received IU with unknown opcode 0x%x\n", opcode); |
|
break; |
|
} |
|
|
|
if (!send_ioctx || !send_ioctx->recv_ioctx) |
|
srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
|
res = true; |
|
|
|
out: |
|
return res; |
|
|
|
push: |
|
if (list_empty(&recv_ioctx->wait_list)) { |
|
WARN_ON_ONCE(ch->processing_wait_list); |
|
list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); |
|
} |
|
goto out; |
|
} |
|
|
|
static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct srpt_rdma_ch *ch = wc->qp->qp_context; |
|
struct srpt_recv_ioctx *ioctx = |
|
container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); |
|
|
|
if (wc->status == IB_WC_SUCCESS) { |
|
int req_lim; |
|
|
|
req_lim = atomic_dec_return(&ch->req_lim); |
|
if (unlikely(req_lim < 0)) |
|
pr_err("req_lim = %d < 0\n", req_lim); |
|
ioctx->byte_len = wc->byte_len; |
|
srpt_handle_new_iu(ch, ioctx); |
|
} else { |
|
pr_info_ratelimited("receiving failed for ioctx %p with status %d\n", |
|
ioctx, wc->status); |
|
} |
|
} |
|
|
|
/* |
|
* This function must be called from the context in which RDMA completions are |
|
* processed because it accesses the wait list without protection against |
|
* access from other threads. |
|
*/ |
|
static void srpt_process_wait_list(struct srpt_rdma_ch *ch) |
|
{ |
|
struct srpt_recv_ioctx *recv_ioctx, *tmp; |
|
|
|
WARN_ON_ONCE(ch->state == CH_CONNECTING); |
|
|
|
if (list_empty(&ch->cmd_wait_list)) |
|
return; |
|
|
|
WARN_ON_ONCE(ch->processing_wait_list); |
|
ch->processing_wait_list = true; |
|
list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list, |
|
wait_list) { |
|
if (!srpt_handle_new_iu(ch, recv_ioctx)) |
|
break; |
|
} |
|
ch->processing_wait_list = false; |
|
} |
|
|
|
/** |
|
* srpt_send_done - send completion callback |
|
* @cq: Completion queue. |
|
* @wc: Work completion. |
|
* |
|
* Note: Although this has not yet been observed during tests, at least in |
|
* theory it is possible that the srpt_get_send_ioctx() call invoked by |
|
* srpt_handle_new_iu() fails. This is possible because the req_lim_delta |
|
* value in each response is set to one, and it is possible that this response |
|
* makes the initiator send a new request before the send completion for that |
|
* response has been processed. This could e.g. happen if the call to |
|
* srpt_put_send_iotcx() is delayed because of a higher priority interrupt or |
|
* if IB retransmission causes generation of the send completion to be |
|
* delayed. Incoming information units for which srpt_get_send_ioctx() fails |
|
* are queued on cmd_wait_list. The code below processes these delayed |
|
* requests one at a time. |
|
*/ |
|
static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct srpt_rdma_ch *ch = wc->qp->qp_context; |
|
struct srpt_send_ioctx *ioctx = |
|
container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); |
|
enum srpt_command_state state; |
|
|
|
state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
|
|
|
WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && |
|
state != SRPT_STATE_MGMT_RSP_SENT); |
|
|
|
atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); |
|
|
|
if (wc->status != IB_WC_SUCCESS) |
|
pr_info("sending response for ioctx 0x%p failed with status %d\n", |
|
ioctx, wc->status); |
|
|
|
if (state != SRPT_STATE_DONE) { |
|
transport_generic_free_cmd(&ioctx->cmd, 0); |
|
} else { |
|
pr_err("IB completion has been received too late for wr_id = %u.\n", |
|
ioctx->ioctx.index); |
|
} |
|
|
|
srpt_process_wait_list(ch); |
|
} |
|
|
|
/** |
|
* srpt_create_ch_ib - create receive and send completion queues |
|
* @ch: SRPT RDMA channel. |
|
*/ |
|
static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) |
|
{ |
|
struct ib_qp_init_attr *qp_init; |
|
struct srpt_port *sport = ch->sport; |
|
struct srpt_device *sdev = sport->sdev; |
|
const struct ib_device_attr *attrs = &sdev->device->attrs; |
|
int sq_size = sport->port_attrib.srp_sq_size; |
|
int i, ret; |
|
|
|
WARN_ON(ch->rq_size < 1); |
|
|
|
ret = -ENOMEM; |
|
qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
|
if (!qp_init) |
|
goto out; |
|
|
|
retry: |
|
ch->cq = ib_cq_pool_get(sdev->device, ch->rq_size + sq_size, -1, |
|
IB_POLL_WORKQUEUE); |
|
if (IS_ERR(ch->cq)) { |
|
ret = PTR_ERR(ch->cq); |
|
pr_err("failed to create CQ cqe= %d ret= %d\n", |
|
ch->rq_size + sq_size, ret); |
|
goto out; |
|
} |
|
ch->cq_size = ch->rq_size + sq_size; |
|
|
|
qp_init->qp_context = (void *)ch; |
|
qp_init->event_handler |
|
= (void(*)(struct ib_event *, void*))srpt_qp_event; |
|
qp_init->send_cq = ch->cq; |
|
qp_init->recv_cq = ch->cq; |
|
qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; |
|
qp_init->qp_type = IB_QPT_RC; |
|
/* |
|
* We divide up our send queue size into half SEND WRs to send the |
|
* completions, and half R/W contexts to actually do the RDMA |
|
* READ/WRITE transfers. Note that we need to allocate CQ slots for |
|
* both both, as RDMA contexts will also post completions for the |
|
* RDMA READ case. |
|
*/ |
|
qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr); |
|
qp_init->cap.max_rdma_ctxs = sq_size / 2; |
|
qp_init->cap.max_send_sge = attrs->max_send_sge; |
|
qp_init->cap.max_recv_sge = 1; |
|
qp_init->port_num = ch->sport->port; |
|
if (sdev->use_srq) |
|
qp_init->srq = sdev->srq; |
|
else |
|
qp_init->cap.max_recv_wr = ch->rq_size; |
|
|
|
if (ch->using_rdma_cm) { |
|
ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init); |
|
ch->qp = ch->rdma_cm.cm_id->qp; |
|
} else { |
|
ch->qp = ib_create_qp(sdev->pd, qp_init); |
|
if (!IS_ERR(ch->qp)) { |
|
ret = srpt_init_ch_qp(ch, ch->qp); |
|
if (ret) |
|
ib_destroy_qp(ch->qp); |
|
} else { |
|
ret = PTR_ERR(ch->qp); |
|
} |
|
} |
|
if (ret) { |
|
bool retry = sq_size > MIN_SRPT_SQ_SIZE; |
|
|
|
if (retry) { |
|
pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n", |
|
sq_size, ret); |
|
ib_cq_pool_put(ch->cq, ch->cq_size); |
|
sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE); |
|
goto retry; |
|
} else { |
|
pr_err("failed to create queue pair with sq_size = %d (%d)\n", |
|
sq_size, ret); |
|
goto err_destroy_cq; |
|
} |
|
} |
|
|
|
atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); |
|
|
|
pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n", |
|
__func__, ch->cq->cqe, qp_init->cap.max_send_sge, |
|
qp_init->cap.max_send_wr, ch); |
|
|
|
if (!sdev->use_srq) |
|
for (i = 0; i < ch->rq_size; i++) |
|
srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]); |
|
|
|
out: |
|
kfree(qp_init); |
|
return ret; |
|
|
|
err_destroy_cq: |
|
ch->qp = NULL; |
|
ib_cq_pool_put(ch->cq, ch->cq_size); |
|
goto out; |
|
} |
|
|
|
static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) |
|
{ |
|
ib_destroy_qp(ch->qp); |
|
ib_cq_pool_put(ch->cq, ch->cq_size); |
|
} |
|
|
|
/** |
|
* srpt_close_ch - close a RDMA channel |
|
* @ch: SRPT RDMA channel. |
|
* |
|
* Make sure all resources associated with the channel will be deallocated at |
|
* an appropriate time. |
|
* |
|
* Returns true if and only if the channel state has been modified into |
|
* CH_DRAINING. |
|
*/ |
|
static bool srpt_close_ch(struct srpt_rdma_ch *ch) |
|
{ |
|
int ret; |
|
|
|
if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
|
pr_debug("%s: already closed\n", ch->sess_name); |
|
return false; |
|
} |
|
|
|
kref_get(&ch->kref); |
|
|
|
ret = srpt_ch_qp_err(ch); |
|
if (ret < 0) |
|
pr_err("%s-%d: changing queue pair into error state failed: %d\n", |
|
ch->sess_name, ch->qp->qp_num, ret); |
|
|
|
ret = srpt_zerolength_write(ch); |
|
if (ret < 0) { |
|
pr_err("%s-%d: queuing zero-length write failed: %d\n", |
|
ch->sess_name, ch->qp->qp_num, ret); |
|
if (srpt_set_ch_state(ch, CH_DISCONNECTED)) |
|
schedule_work(&ch->release_work); |
|
else |
|
WARN_ON_ONCE(true); |
|
} |
|
|
|
kref_put(&ch->kref, srpt_free_ch); |
|
|
|
return true; |
|
} |
|
|
|
/* |
|
* Change the channel state into CH_DISCONNECTING. If a channel has not yet |
|
* reached the connected state, close it. If a channel is in the connected |
|
* state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is |
|
* the responsibility of the caller to ensure that this function is not |
|
* invoked concurrently with the code that accepts a connection. This means |
|
* that this function must either be invoked from inside a CM callback |
|
* function or that it must be invoked with the srpt_port.mutex held. |
|
*/ |
|
static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
|
{ |
|
int ret; |
|
|
|
if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
|
return -ENOTCONN; |
|
|
|
if (ch->using_rdma_cm) { |
|
ret = rdma_disconnect(ch->rdma_cm.cm_id); |
|
} else { |
|
ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0); |
|
if (ret < 0) |
|
ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0); |
|
} |
|
|
|
if (ret < 0 && srpt_close_ch(ch)) |
|
ret = 0; |
|
|
|
return ret; |
|
} |
|
|
|
/* Send DREQ and wait for DREP. */ |
|
static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch) |
|
{ |
|
DECLARE_COMPLETION_ONSTACK(closed); |
|
struct srpt_port *sport = ch->sport; |
|
|
|
pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, |
|
ch->state); |
|
|
|
ch->closed = &closed; |
|
|
|
mutex_lock(&sport->mutex); |
|
srpt_disconnect_ch(ch); |
|
mutex_unlock(&sport->mutex); |
|
|
|
while (wait_for_completion_timeout(&closed, 5 * HZ) == 0) |
|
pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, |
|
ch->sess_name, ch->qp->qp_num, ch->state); |
|
|
|
} |
|
|
|
static void __srpt_close_all_ch(struct srpt_port *sport) |
|
{ |
|
struct srpt_nexus *nexus; |
|
struct srpt_rdma_ch *ch; |
|
|
|
lockdep_assert_held(&sport->mutex); |
|
|
|
list_for_each_entry(nexus, &sport->nexus_list, entry) { |
|
list_for_each_entry(ch, &nexus->ch_list, list) { |
|
if (srpt_disconnect_ch(ch) >= 0) |
|
pr_info("Closing channel %s-%d because target %s_%d has been disabled\n", |
|
ch->sess_name, ch->qp->qp_num, |
|
dev_name(&sport->sdev->device->dev), |
|
sport->port); |
|
srpt_close_ch(ch); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if |
|
* it does not yet exist. |
|
*/ |
|
static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport, |
|
const u8 i_port_id[16], |
|
const u8 t_port_id[16]) |
|
{ |
|
struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n; |
|
|
|
for (;;) { |
|
mutex_lock(&sport->mutex); |
|
list_for_each_entry(n, &sport->nexus_list, entry) { |
|
if (memcmp(n->i_port_id, i_port_id, 16) == 0 && |
|
memcmp(n->t_port_id, t_port_id, 16) == 0) { |
|
nexus = n; |
|
break; |
|
} |
|
} |
|
if (!nexus && tmp_nexus) { |
|
list_add_tail_rcu(&tmp_nexus->entry, |
|
&sport->nexus_list); |
|
swap(nexus, tmp_nexus); |
|
} |
|
mutex_unlock(&sport->mutex); |
|
|
|
if (nexus) |
|
break; |
|
tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); |
|
if (!tmp_nexus) { |
|
nexus = ERR_PTR(-ENOMEM); |
|
break; |
|
} |
|
INIT_LIST_HEAD(&tmp_nexus->ch_list); |
|
memcpy(tmp_nexus->i_port_id, i_port_id, 16); |
|
memcpy(tmp_nexus->t_port_id, t_port_id, 16); |
|
} |
|
|
|
kfree(tmp_nexus); |
|
|
|
return nexus; |
|
} |
|
|
|
static void srpt_set_enabled(struct srpt_port *sport, bool enabled) |
|
__must_hold(&sport->mutex) |
|
{ |
|
lockdep_assert_held(&sport->mutex); |
|
|
|
if (sport->enabled == enabled) |
|
return; |
|
sport->enabled = enabled; |
|
if (!enabled) |
|
__srpt_close_all_ch(sport); |
|
} |
|
|
|
static void srpt_drop_sport_ref(struct srpt_port *sport) |
|
{ |
|
if (atomic_dec_return(&sport->refcount) == 0 && sport->freed_channels) |
|
complete(sport->freed_channels); |
|
} |
|
|
|
static void srpt_free_ch(struct kref *kref) |
|
{ |
|
struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); |
|
|
|
srpt_drop_sport_ref(ch->sport); |
|
kfree_rcu(ch, rcu); |
|
} |
|
|
|
/* |
|
* Shut down the SCSI target session, tell the connection manager to |
|
* disconnect the associated RDMA channel, transition the QP to the error |
|
* state and remove the channel from the channel list. This function is |
|
* typically called from inside srpt_zerolength_write_done(). Concurrent |
|
* srpt_zerolength_write() calls from inside srpt_close_ch() are possible |
|
* as long as the channel is on sport->nexus_list. |
|
*/ |
|
static void srpt_release_channel_work(struct work_struct *w) |
|
{ |
|
struct srpt_rdma_ch *ch; |
|
struct srpt_device *sdev; |
|
struct srpt_port *sport; |
|
struct se_session *se_sess; |
|
|
|
ch = container_of(w, struct srpt_rdma_ch, release_work); |
|
pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num); |
|
|
|
sdev = ch->sport->sdev; |
|
BUG_ON(!sdev); |
|
|
|
se_sess = ch->sess; |
|
BUG_ON(!se_sess); |
|
|
|
target_stop_session(se_sess); |
|
target_wait_for_sess_cmds(se_sess); |
|
|
|
target_remove_session(se_sess); |
|
ch->sess = NULL; |
|
|
|
if (ch->using_rdma_cm) |
|
rdma_destroy_id(ch->rdma_cm.cm_id); |
|
else |
|
ib_destroy_cm_id(ch->ib_cm.cm_id); |
|
|
|
sport = ch->sport; |
|
mutex_lock(&sport->mutex); |
|
list_del_rcu(&ch->list); |
|
mutex_unlock(&sport->mutex); |
|
|
|
if (ch->closed) |
|
complete(ch->closed); |
|
|
|
srpt_destroy_ch_ib(ch); |
|
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, |
|
ch->sport->sdev, ch->rq_size, |
|
ch->rsp_buf_cache, DMA_TO_DEVICE); |
|
|
|
kmem_cache_destroy(ch->rsp_buf_cache); |
|
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
|
sdev, ch->rq_size, |
|
ch->req_buf_cache, DMA_FROM_DEVICE); |
|
|
|
kmem_cache_destroy(ch->req_buf_cache); |
|
|
|
kref_put(&ch->kref, srpt_free_ch); |
|
} |
|
|
|
/** |
|
* srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED |
|
* @sdev: HCA through which the login request was received. |
|
* @ib_cm_id: IB/CM connection identifier in case of IB/CM. |
|
* @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM. |
|
* @port_num: Port through which the REQ message was received. |
|
* @pkey: P_Key of the incoming connection. |
|
* @req: SRP login request. |
|
* @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted |
|
* the login request. |
|
* |
|
* Ownership of the cm_id is transferred to the target session if this |
|
* function returns zero. Otherwise the caller remains the owner of cm_id. |
|
*/ |
|
static int srpt_cm_req_recv(struct srpt_device *const sdev, |
|
struct ib_cm_id *ib_cm_id, |
|
struct rdma_cm_id *rdma_cm_id, |
|
u8 port_num, __be16 pkey, |
|
const struct srp_login_req *req, |
|
const char *src_addr) |
|
{ |
|
struct srpt_port *sport = &sdev->port[port_num - 1]; |
|
struct srpt_nexus *nexus; |
|
struct srp_login_rsp *rsp = NULL; |
|
struct srp_login_rej *rej = NULL; |
|
union { |
|
struct rdma_conn_param rdma_cm; |
|
struct ib_cm_rep_param ib_cm; |
|
} *rep_param = NULL; |
|
struct srpt_rdma_ch *ch = NULL; |
|
char i_port_id[36]; |
|
u32 it_iu_len; |
|
int i, tag_num, tag_size, ret; |
|
struct srpt_tpg *stpg; |
|
|
|
WARN_ON_ONCE(irqs_disabled()); |
|
|
|
it_iu_len = be32_to_cpu(req->req_it_iu_len); |
|
|
|
pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n", |
|
req->initiator_port_id, req->target_port_id, it_iu_len, |
|
port_num, &sport->gid, be16_to_cpu(pkey)); |
|
|
|
nexus = srpt_get_nexus(sport, req->initiator_port_id, |
|
req->target_port_id); |
|
if (IS_ERR(nexus)) { |
|
ret = PTR_ERR(nexus); |
|
goto out; |
|
} |
|
|
|
ret = -ENOMEM; |
|
rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
|
rej = kzalloc(sizeof(*rej), GFP_KERNEL); |
|
rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); |
|
if (!rsp || !rej || !rep_param) |
|
goto out; |
|
|
|
ret = -EINVAL; |
|
if (it_iu_len > srp_max_req_size || it_iu_len < 64) { |
|
rej->reason = cpu_to_be32( |
|
SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); |
|
pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n", |
|
it_iu_len, 64, srp_max_req_size); |
|
goto reject; |
|
} |
|
|
|
if (!sport->enabled) { |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n", |
|
dev_name(&sport->sdev->device->dev), port_num); |
|
goto reject; |
|
} |
|
|
|
if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) |
|
|| *(__be64 *)(req->target_port_id + 8) != |
|
cpu_to_be64(srpt_service_guid)) { |
|
rej->reason = cpu_to_be32( |
|
SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); |
|
pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n"); |
|
goto reject; |
|
} |
|
|
|
ret = -ENOMEM; |
|
ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
|
if (!ch) { |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_err("rejected SRP_LOGIN_REQ because out of memory.\n"); |
|
goto reject; |
|
} |
|
|
|
kref_init(&ch->kref); |
|
ch->pkey = be16_to_cpu(pkey); |
|
ch->nexus = nexus; |
|
ch->zw_cqe.done = srpt_zerolength_write_done; |
|
INIT_WORK(&ch->release_work, srpt_release_channel_work); |
|
ch->sport = sport; |
|
if (ib_cm_id) { |
|
ch->ib_cm.cm_id = ib_cm_id; |
|
ib_cm_id->context = ch; |
|
} else { |
|
ch->using_rdma_cm = true; |
|
ch->rdma_cm.cm_id = rdma_cm_id; |
|
rdma_cm_id->context = ch; |
|
} |
|
/* |
|
* ch->rq_size should be at least as large as the initiator queue |
|
* depth to avoid that the initiator driver has to report QUEUE_FULL |
|
* to the SCSI mid-layer. |
|
*/ |
|
ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr); |
|
spin_lock_init(&ch->spinlock); |
|
ch->state = CH_CONNECTING; |
|
INIT_LIST_HEAD(&ch->cmd_wait_list); |
|
ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size; |
|
|
|
ch->rsp_buf_cache = kmem_cache_create("srpt-rsp-buf", ch->max_rsp_size, |
|
512, 0, NULL); |
|
if (!ch->rsp_buf_cache) |
|
goto free_ch; |
|
|
|
ch->ioctx_ring = (struct srpt_send_ioctx **) |
|
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, |
|
sizeof(*ch->ioctx_ring[0]), |
|
ch->rsp_buf_cache, 0, DMA_TO_DEVICE); |
|
if (!ch->ioctx_ring) { |
|
pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n"); |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
goto free_rsp_cache; |
|
} |
|
|
|
for (i = 0; i < ch->rq_size; i++) |
|
ch->ioctx_ring[i]->ch = ch; |
|
if (!sdev->use_srq) { |
|
u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ? |
|
be16_to_cpu(req->imm_data_offset) : 0; |
|
u16 alignment_offset; |
|
u32 req_sz; |
|
|
|
if (req->req_flags & SRP_IMMED_REQUESTED) |
|
pr_debug("imm_data_offset = %d\n", |
|
be16_to_cpu(req->imm_data_offset)); |
|
if (imm_data_offset >= sizeof(struct srp_cmd)) { |
|
ch->imm_data_offset = imm_data_offset; |
|
rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP; |
|
} else { |
|
ch->imm_data_offset = 0; |
|
} |
|
alignment_offset = round_up(imm_data_offset, 512) - |
|
imm_data_offset; |
|
req_sz = alignment_offset + imm_data_offset + srp_max_req_size; |
|
ch->req_buf_cache = kmem_cache_create("srpt-req-buf", req_sz, |
|
512, 0, NULL); |
|
if (!ch->req_buf_cache) |
|
goto free_rsp_ring; |
|
|
|
ch->ioctx_recv_ring = (struct srpt_recv_ioctx **) |
|
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, |
|
sizeof(*ch->ioctx_recv_ring[0]), |
|
ch->req_buf_cache, |
|
alignment_offset, |
|
DMA_FROM_DEVICE); |
|
if (!ch->ioctx_recv_ring) { |
|
pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n"); |
|
rej->reason = |
|
cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
goto free_recv_cache; |
|
} |
|
for (i = 0; i < ch->rq_size; i++) |
|
INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list); |
|
} |
|
|
|
ret = srpt_create_ch_ib(ch); |
|
if (ret) { |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n"); |
|
goto free_recv_ring; |
|
} |
|
|
|
strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name)); |
|
snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx", |
|
be64_to_cpu(*(__be64 *)nexus->i_port_id), |
|
be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8))); |
|
|
|
pr_debug("registering src addr %s or i_port_id %s\n", ch->sess_name, |
|
i_port_id); |
|
|
|
tag_num = ch->rq_size; |
|
tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */ |
|
|
|
mutex_lock(&sport->port_guid_id.mutex); |
|
list_for_each_entry(stpg, &sport->port_guid_id.tpg_list, entry) { |
|
if (!IS_ERR_OR_NULL(ch->sess)) |
|
break; |
|
ch->sess = target_setup_session(&stpg->tpg, tag_num, |
|
tag_size, TARGET_PROT_NORMAL, |
|
ch->sess_name, ch, NULL); |
|
} |
|
mutex_unlock(&sport->port_guid_id.mutex); |
|
|
|
mutex_lock(&sport->port_gid_id.mutex); |
|
list_for_each_entry(stpg, &sport->port_gid_id.tpg_list, entry) { |
|
if (!IS_ERR_OR_NULL(ch->sess)) |
|
break; |
|
ch->sess = target_setup_session(&stpg->tpg, tag_num, |
|
tag_size, TARGET_PROT_NORMAL, i_port_id, |
|
ch, NULL); |
|
if (!IS_ERR_OR_NULL(ch->sess)) |
|
break; |
|
/* Retry without leading "0x" */ |
|
ch->sess = target_setup_session(&stpg->tpg, tag_num, |
|
tag_size, TARGET_PROT_NORMAL, |
|
i_port_id + 2, ch, NULL); |
|
} |
|
mutex_unlock(&sport->port_gid_id.mutex); |
|
|
|
if (IS_ERR_OR_NULL(ch->sess)) { |
|
WARN_ON_ONCE(ch->sess == NULL); |
|
ret = PTR_ERR(ch->sess); |
|
ch->sess = NULL; |
|
pr_info("Rejected login for initiator %s: ret = %d.\n", |
|
ch->sess_name, ret); |
|
rej->reason = cpu_to_be32(ret == -ENOMEM ? |
|
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES : |
|
SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); |
|
goto destroy_ib; |
|
} |
|
|
|
/* |
|
* Once a session has been created destruction of srpt_rdma_ch objects |
|
* will decrement sport->refcount. Hence increment sport->refcount now. |
|
*/ |
|
atomic_inc(&sport->refcount); |
|
|
|
mutex_lock(&sport->mutex); |
|
|
|
if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { |
|
struct srpt_rdma_ch *ch2; |
|
|
|
list_for_each_entry(ch2, &nexus->ch_list, list) { |
|
if (srpt_disconnect_ch(ch2) < 0) |
|
continue; |
|
pr_info("Relogin - closed existing channel %s\n", |
|
ch2->sess_name); |
|
rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED; |
|
} |
|
} else { |
|
rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; |
|
} |
|
|
|
list_add_tail_rcu(&ch->list, &nexus->ch_list); |
|
|
|
if (!sport->enabled) { |
|
rej->reason = cpu_to_be32( |
|
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n", |
|
dev_name(&sdev->device->dev), port_num); |
|
mutex_unlock(&sport->mutex); |
|
ret = -EINVAL; |
|
goto reject; |
|
} |
|
|
|
mutex_unlock(&sport->mutex); |
|
|
|
ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp); |
|
if (ret) { |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n", |
|
ret); |
|
goto reject; |
|
} |
|
|
|
pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess, |
|
ch->sess_name, ch); |
|
|
|
/* create srp_login_response */ |
|
rsp->opcode = SRP_LOGIN_RSP; |
|
rsp->tag = req->tag; |
|
rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size); |
|
rsp->max_ti_iu_len = req->req_it_iu_len; |
|
ch->max_ti_iu_len = it_iu_len; |
|
rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
|
SRP_BUF_FORMAT_INDIRECT); |
|
rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
|
atomic_set(&ch->req_lim, ch->rq_size); |
|
atomic_set(&ch->req_lim_delta, 0); |
|
|
|
/* create cm reply */ |
|
if (ch->using_rdma_cm) { |
|
rep_param->rdma_cm.private_data = (void *)rsp; |
|
rep_param->rdma_cm.private_data_len = sizeof(*rsp); |
|
rep_param->rdma_cm.rnr_retry_count = 7; |
|
rep_param->rdma_cm.flow_control = 1; |
|
rep_param->rdma_cm.responder_resources = 4; |
|
rep_param->rdma_cm.initiator_depth = 4; |
|
} else { |
|
rep_param->ib_cm.qp_num = ch->qp->qp_num; |
|
rep_param->ib_cm.private_data = (void *)rsp; |
|
rep_param->ib_cm.private_data_len = sizeof(*rsp); |
|
rep_param->ib_cm.rnr_retry_count = 7; |
|
rep_param->ib_cm.flow_control = 1; |
|
rep_param->ib_cm.failover_accepted = 0; |
|
rep_param->ib_cm.srq = 1; |
|
rep_param->ib_cm.responder_resources = 4; |
|
rep_param->ib_cm.initiator_depth = 4; |
|
} |
|
|
|
/* |
|
* Hold the sport mutex while accepting a connection to avoid that |
|
* srpt_disconnect_ch() is invoked concurrently with this code. |
|
*/ |
|
mutex_lock(&sport->mutex); |
|
if (sport->enabled && ch->state == CH_CONNECTING) { |
|
if (ch->using_rdma_cm) |
|
ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm); |
|
else |
|
ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm); |
|
} else { |
|
ret = -EINVAL; |
|
} |
|
mutex_unlock(&sport->mutex); |
|
|
|
switch (ret) { |
|
case 0: |
|
break; |
|
case -EINVAL: |
|
goto reject; |
|
default: |
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
|
pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n", |
|
ret); |
|
goto reject; |
|
} |
|
|
|
goto out; |
|
|
|
destroy_ib: |
|
srpt_destroy_ch_ib(ch); |
|
|
|
free_recv_ring: |
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
|
ch->sport->sdev, ch->rq_size, |
|
ch->req_buf_cache, DMA_FROM_DEVICE); |
|
|
|
free_recv_cache: |
|
kmem_cache_destroy(ch->req_buf_cache); |
|
|
|
free_rsp_ring: |
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, |
|
ch->sport->sdev, ch->rq_size, |
|
ch->rsp_buf_cache, DMA_TO_DEVICE); |
|
|
|
free_rsp_cache: |
|
kmem_cache_destroy(ch->rsp_buf_cache); |
|
|
|
free_ch: |
|
if (rdma_cm_id) |
|
rdma_cm_id->context = NULL; |
|
else |
|
ib_cm_id->context = NULL; |
|
kfree(ch); |
|
ch = NULL; |
|
|
|
WARN_ON_ONCE(ret == 0); |
|
|
|
reject: |
|
pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason)); |
|
rej->opcode = SRP_LOGIN_REJ; |
|
rej->tag = req->tag; |
|
rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
|
SRP_BUF_FORMAT_INDIRECT); |
|
|
|
if (rdma_cm_id) |
|
rdma_reject(rdma_cm_id, rej, sizeof(*rej), |
|
IB_CM_REJ_CONSUMER_DEFINED); |
|
else |
|
ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, |
|
rej, sizeof(*rej)); |
|
|
|
if (ch && ch->sess) { |
|
srpt_close_ch(ch); |
|
/* |
|
* Tell the caller not to free cm_id since |
|
* srpt_release_channel_work() will do that. |
|
*/ |
|
ret = 0; |
|
} |
|
|
|
out: |
|
kfree(rep_param); |
|
kfree(rsp); |
|
kfree(rej); |
|
|
|
return ret; |
|
} |
|
|
|
static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id, |
|
const struct ib_cm_req_event_param *param, |
|
void *private_data) |
|
{ |
|
char sguid[40]; |
|
|
|
srpt_format_guid(sguid, sizeof(sguid), |
|
¶m->primary_path->dgid.global.interface_id); |
|
|
|
return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port, |
|
param->primary_path->pkey, |
|
private_data, sguid); |
|
} |
|
|
|
static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id, |
|
struct rdma_cm_event *event) |
|
{ |
|
struct srpt_device *sdev; |
|
struct srp_login_req req; |
|
const struct srp_login_req_rdma *req_rdma; |
|
struct sa_path_rec *path_rec = cm_id->route.path_rec; |
|
char src_addr[40]; |
|
|
|
sdev = ib_get_client_data(cm_id->device, &srpt_client); |
|
if (!sdev) |
|
return -ECONNREFUSED; |
|
|
|
if (event->param.conn.private_data_len < sizeof(*req_rdma)) |
|
return -EINVAL; |
|
|
|
/* Transform srp_login_req_rdma into srp_login_req. */ |
|
req_rdma = event->param.conn.private_data; |
|
memset(&req, 0, sizeof(req)); |
|
req.opcode = req_rdma->opcode; |
|
req.tag = req_rdma->tag; |
|
req.req_it_iu_len = req_rdma->req_it_iu_len; |
|
req.req_buf_fmt = req_rdma->req_buf_fmt; |
|
req.req_flags = req_rdma->req_flags; |
|
memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16); |
|
memcpy(req.target_port_id, req_rdma->target_port_id, 16); |
|
req.imm_data_offset = req_rdma->imm_data_offset; |
|
|
|
snprintf(src_addr, sizeof(src_addr), "%pIS", |
|
&cm_id->route.addr.src_addr); |
|
|
|
return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num, |
|
path_rec ? path_rec->pkey : 0, &req, src_addr); |
|
} |
|
|
|
static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
|
enum ib_cm_rej_reason reason, |
|
const u8 *private_data, |
|
u8 private_data_len) |
|
{ |
|
char *priv = NULL; |
|
int i; |
|
|
|
if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, |
|
GFP_KERNEL))) { |
|
for (i = 0; i < private_data_len; i++) |
|
sprintf(priv + 3 * i, " %02x", private_data[i]); |
|
} |
|
pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", |
|
ch->sess_name, ch->qp->qp_num, reason, private_data_len ? |
|
"; private data" : "", priv ? priv : " (?)"); |
|
kfree(priv); |
|
} |
|
|
|
/** |
|
* srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event |
|
* @ch: SRPT RDMA channel. |
|
* |
|
* An RTU (ready to use) message indicates that the connection has been |
|
* established and that the recipient may begin transmitting. |
|
*/ |
|
static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
|
{ |
|
int ret; |
|
|
|
ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp); |
|
if (ret < 0) { |
|
pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name, |
|
ch->qp->qp_num); |
|
srpt_close_ch(ch); |
|
return; |
|
} |
|
|
|
/* |
|
* Note: calling srpt_close_ch() if the transition to the LIVE state |
|
* fails is not necessary since that means that that function has |
|
* already been invoked from another thread. |
|
*/ |
|
if (!srpt_set_ch_state(ch, CH_LIVE)) { |
|
pr_err("%s-%d: channel transition to LIVE state failed\n", |
|
ch->sess_name, ch->qp->qp_num); |
|
return; |
|
} |
|
|
|
/* Trigger wait list processing. */ |
|
ret = srpt_zerolength_write(ch); |
|
WARN_ONCE(ret < 0, "%d\n", ret); |
|
} |
|
|
|
/** |
|
* srpt_cm_handler - IB connection manager callback function |
|
* @cm_id: IB/CM connection identifier. |
|
* @event: IB/CM event. |
|
* |
|
* A non-zero return value will cause the caller destroy the CM ID. |
|
* |
|
* Note: srpt_cm_handler() must only return a non-zero value when transferring |
|
* ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning |
|
* a non-zero value in any other case will trigger a race with the |
|
* ib_destroy_cm_id() call in srpt_release_channel(). |
|
*/ |
|
static int srpt_cm_handler(struct ib_cm_id *cm_id, |
|
const struct ib_cm_event *event) |
|
{ |
|
struct srpt_rdma_ch *ch = cm_id->context; |
|
int ret; |
|
|
|
ret = 0; |
|
switch (event->event) { |
|
case IB_CM_REQ_RECEIVED: |
|
ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd, |
|
event->private_data); |
|
break; |
|
case IB_CM_REJ_RECEIVED: |
|
srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
|
event->private_data, |
|
IB_CM_REJ_PRIVATE_DATA_SIZE); |
|
break; |
|
case IB_CM_RTU_RECEIVED: |
|
case IB_CM_USER_ESTABLISHED: |
|
srpt_cm_rtu_recv(ch); |
|
break; |
|
case IB_CM_DREQ_RECEIVED: |
|
srpt_disconnect_ch(ch); |
|
break; |
|
case IB_CM_DREP_RECEIVED: |
|
pr_info("Received CM DREP message for ch %s-%d.\n", |
|
ch->sess_name, ch->qp->qp_num); |
|
srpt_close_ch(ch); |
|
break; |
|
case IB_CM_TIMEWAIT_EXIT: |
|
pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
|
ch->sess_name, ch->qp->qp_num); |
|
srpt_close_ch(ch); |
|
break; |
|
case IB_CM_REP_ERROR: |
|
pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
|
ch->qp->qp_num); |
|
break; |
|
case IB_CM_DREQ_ERROR: |
|
pr_info("Received CM DREQ ERROR event.\n"); |
|
break; |
|
case IB_CM_MRA_RECEIVED: |
|
pr_info("Received CM MRA event\n"); |
|
break; |
|
default: |
|
pr_err("received unrecognized CM event %d\n", event->event); |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id, |
|
struct rdma_cm_event *event) |
|
{ |
|
struct srpt_rdma_ch *ch = cm_id->context; |
|
int ret = 0; |
|
|
|
switch (event->event) { |
|
case RDMA_CM_EVENT_CONNECT_REQUEST: |
|
ret = srpt_rdma_cm_req_recv(cm_id, event); |
|
break; |
|
case RDMA_CM_EVENT_REJECTED: |
|
srpt_cm_rej_recv(ch, event->status, |
|
event->param.conn.private_data, |
|
event->param.conn.private_data_len); |
|
break; |
|
case RDMA_CM_EVENT_ESTABLISHED: |
|
srpt_cm_rtu_recv(ch); |
|
break; |
|
case RDMA_CM_EVENT_DISCONNECTED: |
|
if (ch->state < CH_DISCONNECTING) |
|
srpt_disconnect_ch(ch); |
|
else |
|
srpt_close_ch(ch); |
|
break; |
|
case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
|
srpt_close_ch(ch); |
|
break; |
|
case RDMA_CM_EVENT_UNREACHABLE: |
|
pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
|
ch->qp->qp_num); |
|
break; |
|
case RDMA_CM_EVENT_DEVICE_REMOVAL: |
|
case RDMA_CM_EVENT_ADDR_CHANGE: |
|
break; |
|
default: |
|
pr_err("received unrecognized RDMA CM event %d\n", |
|
event->event); |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* srpt_write_pending - Start data transfer from initiator to target (write). |
|
*/ |
|
static int srpt_write_pending(struct se_cmd *se_cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx = |
|
container_of(se_cmd, struct srpt_send_ioctx, cmd); |
|
struct srpt_rdma_ch *ch = ioctx->ch; |
|
struct ib_send_wr *first_wr = NULL; |
|
struct ib_cqe *cqe = &ioctx->rdma_cqe; |
|
enum srpt_command_state new_state; |
|
int ret, i; |
|
|
|
if (ioctx->recv_ioctx) { |
|
srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN); |
|
target_execute_cmd(&ioctx->cmd); |
|
return 0; |
|
} |
|
|
|
new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); |
|
WARN_ON(new_state == SRPT_STATE_DONE); |
|
|
|
if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) { |
|
pr_warn("%s: IB send queue full (needed %d)\n", |
|
__func__, ioctx->n_rdma); |
|
ret = -ENOMEM; |
|
goto out_undo; |
|
} |
|
|
|
cqe->done = srpt_rdma_read_done; |
|
for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { |
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; |
|
|
|
first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port, |
|
cqe, first_wr); |
|
cqe = NULL; |
|
} |
|
|
|
ret = ib_post_send(ch->qp, first_wr, NULL); |
|
if (ret) { |
|
pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n", |
|
__func__, ret, ioctx->n_rdma, |
|
atomic_read(&ch->sq_wr_avail)); |
|
goto out_undo; |
|
} |
|
|
|
return 0; |
|
out_undo: |
|
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); |
|
return ret; |
|
} |
|
|
|
static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) |
|
{ |
|
switch (tcm_mgmt_status) { |
|
case TMR_FUNCTION_COMPLETE: |
|
return SRP_TSK_MGMT_SUCCESS; |
|
case TMR_FUNCTION_REJECTED: |
|
return SRP_TSK_MGMT_FUNC_NOT_SUPP; |
|
} |
|
return SRP_TSK_MGMT_FAILED; |
|
} |
|
|
|
/** |
|
* srpt_queue_response - transmit the response to a SCSI command |
|
* @cmd: SCSI target command. |
|
* |
|
* Callback function called by the TCM core. Must not block since it can be |
|
* invoked on the context of the IB completion handler. |
|
*/ |
|
static void srpt_queue_response(struct se_cmd *cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx = |
|
container_of(cmd, struct srpt_send_ioctx, cmd); |
|
struct srpt_rdma_ch *ch = ioctx->ch; |
|
struct srpt_device *sdev = ch->sport->sdev; |
|
struct ib_send_wr send_wr, *first_wr = &send_wr; |
|
struct ib_sge sge; |
|
enum srpt_command_state state; |
|
int resp_len, ret, i; |
|
u8 srp_tm_status; |
|
|
|
state = ioctx->state; |
|
switch (state) { |
|
case SRPT_STATE_NEW: |
|
case SRPT_STATE_DATA_IN: |
|
ioctx->state = SRPT_STATE_CMD_RSP_SENT; |
|
break; |
|
case SRPT_STATE_MGMT: |
|
ioctx->state = SRPT_STATE_MGMT_RSP_SENT; |
|
break; |
|
default: |
|
WARN(true, "ch %p; cmd %d: unexpected command state %d\n", |
|
ch, ioctx->ioctx.index, ioctx->state); |
|
break; |
|
} |
|
|
|
if (WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)) |
|
return; |
|
|
|
/* For read commands, transfer the data to the initiator. */ |
|
if (ioctx->cmd.data_direction == DMA_FROM_DEVICE && |
|
ioctx->cmd.data_length && |
|
!ioctx->queue_status_only) { |
|
for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { |
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; |
|
|
|
first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, |
|
ch->sport->port, NULL, first_wr); |
|
} |
|
} |
|
|
|
if (state != SRPT_STATE_MGMT) |
|
resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
|
cmd->scsi_status); |
|
else { |
|
srp_tm_status |
|
= tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); |
|
resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, |
|
ioctx->cmd.tag); |
|
} |
|
|
|
atomic_inc(&ch->req_lim); |
|
|
|
if (unlikely(atomic_sub_return(1 + ioctx->n_rdma, |
|
&ch->sq_wr_avail) < 0)) { |
|
pr_warn("%s: IB send queue full (needed %d)\n", |
|
__func__, ioctx->n_rdma); |
|
goto out; |
|
} |
|
|
|
ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len, |
|
DMA_TO_DEVICE); |
|
|
|
sge.addr = ioctx->ioctx.dma; |
|
sge.length = resp_len; |
|
sge.lkey = sdev->lkey; |
|
|
|
ioctx->ioctx.cqe.done = srpt_send_done; |
|
send_wr.next = NULL; |
|
send_wr.wr_cqe = &ioctx->ioctx.cqe; |
|
send_wr.sg_list = &sge; |
|
send_wr.num_sge = 1; |
|
send_wr.opcode = IB_WR_SEND; |
|
send_wr.send_flags = IB_SEND_SIGNALED; |
|
|
|
ret = ib_post_send(ch->qp, first_wr, NULL); |
|
if (ret < 0) { |
|
pr_err("%s: sending cmd response failed for tag %llu (%d)\n", |
|
__func__, ioctx->cmd.tag, ret); |
|
goto out; |
|
} |
|
|
|
return; |
|
|
|
out: |
|
atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); |
|
atomic_dec(&ch->req_lim); |
|
srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
|
target_put_sess_cmd(&ioctx->cmd); |
|
} |
|
|
|
static int srpt_queue_data_in(struct se_cmd *cmd) |
|
{ |
|
srpt_queue_response(cmd); |
|
return 0; |
|
} |
|
|
|
static void srpt_queue_tm_rsp(struct se_cmd *cmd) |
|
{ |
|
srpt_queue_response(cmd); |
|
} |
|
|
|
/* |
|
* This function is called for aborted commands if no response is sent to the |
|
* initiator. Make sure that the credits freed by aborting a command are |
|
* returned to the initiator the next time a response is sent by incrementing |
|
* ch->req_lim_delta. |
|
*/ |
|
static void srpt_aborted_task(struct se_cmd *cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx = container_of(cmd, |
|
struct srpt_send_ioctx, cmd); |
|
struct srpt_rdma_ch *ch = ioctx->ch; |
|
|
|
atomic_inc(&ch->req_lim_delta); |
|
} |
|
|
|
static int srpt_queue_status(struct se_cmd *cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx; |
|
|
|
ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); |
|
BUG_ON(ioctx->sense_data != cmd->sense_buffer); |
|
if (cmd->se_cmd_flags & |
|
(SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) |
|
WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); |
|
ioctx->queue_status_only = true; |
|
srpt_queue_response(cmd); |
|
return 0; |
|
} |
|
|
|
static void srpt_refresh_port_work(struct work_struct *work) |
|
{ |
|
struct srpt_port *sport = container_of(work, struct srpt_port, work); |
|
|
|
srpt_refresh_port(sport); |
|
} |
|
|
|
/** |
|
* srpt_release_sport - disable login and wait for associated channels |
|
* @sport: SRPT HCA port. |
|
*/ |
|
static int srpt_release_sport(struct srpt_port *sport) |
|
{ |
|
DECLARE_COMPLETION_ONSTACK(c); |
|
struct srpt_nexus *nexus, *next_n; |
|
struct srpt_rdma_ch *ch; |
|
|
|
WARN_ON_ONCE(irqs_disabled()); |
|
|
|
sport->freed_channels = &c; |
|
|
|
mutex_lock(&sport->mutex); |
|
srpt_set_enabled(sport, false); |
|
mutex_unlock(&sport->mutex); |
|
|
|
while (atomic_read(&sport->refcount) > 0 && |
|
wait_for_completion_timeout(&c, 5 * HZ) <= 0) { |
|
pr_info("%s_%d: waiting for unregistration of %d sessions ...\n", |
|
dev_name(&sport->sdev->device->dev), sport->port, |
|
atomic_read(&sport->refcount)); |
|
rcu_read_lock(); |
|
list_for_each_entry(nexus, &sport->nexus_list, entry) { |
|
list_for_each_entry(ch, &nexus->ch_list, list) { |
|
pr_info("%s-%d: state %s\n", |
|
ch->sess_name, ch->qp->qp_num, |
|
get_ch_state_name(ch->state)); |
|
} |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
mutex_lock(&sport->mutex); |
|
list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) { |
|
list_del(&nexus->entry); |
|
kfree_rcu(nexus, rcu); |
|
} |
|
mutex_unlock(&sport->mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static struct se_wwn *__srpt_lookup_wwn(const char *name) |
|
{ |
|
struct ib_device *dev; |
|
struct srpt_device *sdev; |
|
struct srpt_port *sport; |
|
int i; |
|
|
|
list_for_each_entry(sdev, &srpt_dev_list, list) { |
|
dev = sdev->device; |
|
if (!dev) |
|
continue; |
|
|
|
for (i = 0; i < dev->phys_port_cnt; i++) { |
|
sport = &sdev->port[i]; |
|
|
|
if (strcmp(sport->port_guid_id.name, name) == 0) |
|
return &sport->port_guid_id.wwn; |
|
if (strcmp(sport->port_gid_id.name, name) == 0) |
|
return &sport->port_gid_id.wwn; |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static struct se_wwn *srpt_lookup_wwn(const char *name) |
|
{ |
|
struct se_wwn *wwn; |
|
|
|
spin_lock(&srpt_dev_lock); |
|
wwn = __srpt_lookup_wwn(name); |
|
spin_unlock(&srpt_dev_lock); |
|
|
|
return wwn; |
|
} |
|
|
|
static void srpt_free_srq(struct srpt_device *sdev) |
|
{ |
|
if (!sdev->srq) |
|
return; |
|
|
|
ib_destroy_srq(sdev->srq); |
|
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, |
|
sdev->srq_size, sdev->req_buf_cache, |
|
DMA_FROM_DEVICE); |
|
kmem_cache_destroy(sdev->req_buf_cache); |
|
sdev->srq = NULL; |
|
} |
|
|
|
static int srpt_alloc_srq(struct srpt_device *sdev) |
|
{ |
|
struct ib_srq_init_attr srq_attr = { |
|
.event_handler = srpt_srq_event, |
|
.srq_context = (void *)sdev, |
|
.attr.max_wr = sdev->srq_size, |
|
.attr.max_sge = 1, |
|
.srq_type = IB_SRQT_BASIC, |
|
}; |
|
struct ib_device *device = sdev->device; |
|
struct ib_srq *srq; |
|
int i; |
|
|
|
WARN_ON_ONCE(sdev->srq); |
|
srq = ib_create_srq(sdev->pd, &srq_attr); |
|
if (IS_ERR(srq)) { |
|
pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq)); |
|
return PTR_ERR(srq); |
|
} |
|
|
|
pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size, |
|
sdev->device->attrs.max_srq_wr, dev_name(&device->dev)); |
|
|
|
sdev->req_buf_cache = kmem_cache_create("srpt-srq-req-buf", |
|
srp_max_req_size, 0, 0, NULL); |
|
if (!sdev->req_buf_cache) |
|
goto free_srq; |
|
|
|
sdev->ioctx_ring = (struct srpt_recv_ioctx **) |
|
srpt_alloc_ioctx_ring(sdev, sdev->srq_size, |
|
sizeof(*sdev->ioctx_ring[0]), |
|
sdev->req_buf_cache, 0, DMA_FROM_DEVICE); |
|
if (!sdev->ioctx_ring) |
|
goto free_cache; |
|
|
|
sdev->use_srq = true; |
|
sdev->srq = srq; |
|
|
|
for (i = 0; i < sdev->srq_size; ++i) { |
|
INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list); |
|
srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]); |
|
} |
|
|
|
return 0; |
|
|
|
free_cache: |
|
kmem_cache_destroy(sdev->req_buf_cache); |
|
|
|
free_srq: |
|
ib_destroy_srq(srq); |
|
return -ENOMEM; |
|
} |
|
|
|
static int srpt_use_srq(struct srpt_device *sdev, bool use_srq) |
|
{ |
|
struct ib_device *device = sdev->device; |
|
int ret = 0; |
|
|
|
if (!use_srq) { |
|
srpt_free_srq(sdev); |
|
sdev->use_srq = false; |
|
} else if (use_srq && !sdev->srq) { |
|
ret = srpt_alloc_srq(sdev); |
|
} |
|
pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, |
|
dev_name(&device->dev), sdev->use_srq, ret); |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_add_one - InfiniBand device addition callback function |
|
* @device: Describes a HCA. |
|
*/ |
|
static int srpt_add_one(struct ib_device *device) |
|
{ |
|
struct srpt_device *sdev; |
|
struct srpt_port *sport; |
|
int ret; |
|
u32 i; |
|
|
|
pr_debug("device = %p\n", device); |
|
|
|
sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt), |
|
GFP_KERNEL); |
|
if (!sdev) |
|
return -ENOMEM; |
|
|
|
sdev->device = device; |
|
mutex_init(&sdev->sdev_mutex); |
|
|
|
sdev->pd = ib_alloc_pd(device, 0); |
|
if (IS_ERR(sdev->pd)) { |
|
ret = PTR_ERR(sdev->pd); |
|
goto free_dev; |
|
} |
|
|
|
sdev->lkey = sdev->pd->local_dma_lkey; |
|
|
|
sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
|
|
|
srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq); |
|
|
|
if (!srpt_service_guid) |
|
srpt_service_guid = be64_to_cpu(device->node_guid); |
|
|
|
if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND) |
|
sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); |
|
if (IS_ERR(sdev->cm_id)) { |
|
pr_info("ib_create_cm_id() failed: %ld\n", |
|
PTR_ERR(sdev->cm_id)); |
|
ret = PTR_ERR(sdev->cm_id); |
|
sdev->cm_id = NULL; |
|
if (!rdma_cm_id) |
|
goto err_ring; |
|
} |
|
|
|
/* print out target login information */ |
|
pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n", |
|
srpt_service_guid, srpt_service_guid, srpt_service_guid); |
|
|
|
/* |
|
* We do not have a consistent service_id (ie. also id_ext of target_id) |
|
* to identify this target. We currently use the guid of the first HCA |
|
* in the system as service_id; therefore, the target_id will change |
|
* if this HCA is gone bad and replaced by different HCA |
|
*/ |
|
ret = sdev->cm_id ? |
|
ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0) : |
|
0; |
|
if (ret < 0) { |
|
pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret, |
|
sdev->cm_id->state); |
|
goto err_cm; |
|
} |
|
|
|
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, |
|
srpt_event_handler); |
|
ib_register_event_handler(&sdev->event_handler); |
|
|
|
for (i = 1; i <= sdev->device->phys_port_cnt; i++) { |
|
sport = &sdev->port[i - 1]; |
|
INIT_LIST_HEAD(&sport->nexus_list); |
|
mutex_init(&sport->mutex); |
|
sport->sdev = sdev; |
|
sport->port = i; |
|
sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; |
|
sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; |
|
sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; |
|
sport->port_attrib.use_srq = false; |
|
INIT_WORK(&sport->work, srpt_refresh_port_work); |
|
mutex_init(&sport->port_guid_id.mutex); |
|
INIT_LIST_HEAD(&sport->port_guid_id.tpg_list); |
|
mutex_init(&sport->port_gid_id.mutex); |
|
INIT_LIST_HEAD(&sport->port_gid_id.tpg_list); |
|
|
|
ret = srpt_refresh_port(sport); |
|
if (ret) { |
|
pr_err("MAD registration failed for %s-%d.\n", |
|
dev_name(&sdev->device->dev), i); |
|
i--; |
|
goto err_port; |
|
} |
|
} |
|
|
|
spin_lock(&srpt_dev_lock); |
|
list_add_tail(&sdev->list, &srpt_dev_list); |
|
spin_unlock(&srpt_dev_lock); |
|
|
|
ib_set_client_data(device, &srpt_client, sdev); |
|
pr_debug("added %s.\n", dev_name(&device->dev)); |
|
return 0; |
|
|
|
err_port: |
|
srpt_unregister_mad_agent(sdev, i); |
|
ib_unregister_event_handler(&sdev->event_handler); |
|
err_cm: |
|
if (sdev->cm_id) |
|
ib_destroy_cm_id(sdev->cm_id); |
|
err_ring: |
|
srpt_free_srq(sdev); |
|
ib_dealloc_pd(sdev->pd); |
|
free_dev: |
|
kfree(sdev); |
|
pr_info("%s(%s) failed.\n", __func__, dev_name(&device->dev)); |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_remove_one - InfiniBand device removal callback function |
|
* @device: Describes a HCA. |
|
* @client_data: The value passed as the third argument to ib_set_client_data(). |
|
*/ |
|
static void srpt_remove_one(struct ib_device *device, void *client_data) |
|
{ |
|
struct srpt_device *sdev = client_data; |
|
int i; |
|
|
|
srpt_unregister_mad_agent(sdev, sdev->device->phys_port_cnt); |
|
|
|
ib_unregister_event_handler(&sdev->event_handler); |
|
|
|
/* Cancel any work queued by the just unregistered IB event handler. */ |
|
for (i = 0; i < sdev->device->phys_port_cnt; i++) |
|
cancel_work_sync(&sdev->port[i].work); |
|
|
|
if (sdev->cm_id) |
|
ib_destroy_cm_id(sdev->cm_id); |
|
|
|
ib_set_client_data(device, &srpt_client, NULL); |
|
|
|
/* |
|
* Unregistering a target must happen after destroying sdev->cm_id |
|
* such that no new SRP_LOGIN_REQ information units can arrive while |
|
* destroying the target. |
|
*/ |
|
spin_lock(&srpt_dev_lock); |
|
list_del(&sdev->list); |
|
spin_unlock(&srpt_dev_lock); |
|
|
|
for (i = 0; i < sdev->device->phys_port_cnt; i++) |
|
srpt_release_sport(&sdev->port[i]); |
|
|
|
srpt_free_srq(sdev); |
|
|
|
ib_dealloc_pd(sdev->pd); |
|
|
|
kfree(sdev); |
|
} |
|
|
|
static struct ib_client srpt_client = { |
|
.name = DRV_NAME, |
|
.add = srpt_add_one, |
|
.remove = srpt_remove_one |
|
}; |
|
|
|
static int srpt_check_true(struct se_portal_group *se_tpg) |
|
{ |
|
return 1; |
|
} |
|
|
|
static int srpt_check_false(struct se_portal_group *se_tpg) |
|
{ |
|
return 0; |
|
} |
|
|
|
static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg) |
|
{ |
|
return tpg->se_tpg_wwn->priv; |
|
} |
|
|
|
static struct srpt_port_id *srpt_wwn_to_sport_id(struct se_wwn *wwn) |
|
{ |
|
struct srpt_port *sport = wwn->priv; |
|
|
|
if (wwn == &sport->port_guid_id.wwn) |
|
return &sport->port_guid_id; |
|
if (wwn == &sport->port_gid_id.wwn) |
|
return &sport->port_gid_id; |
|
WARN_ON_ONCE(true); |
|
return NULL; |
|
} |
|
|
|
static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
|
{ |
|
struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg); |
|
|
|
return stpg->sport_id->name; |
|
} |
|
|
|
static u16 srpt_get_tag(struct se_portal_group *tpg) |
|
{ |
|
return 1; |
|
} |
|
|
|
static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
|
{ |
|
return 1; |
|
} |
|
|
|
static void srpt_release_cmd(struct se_cmd *se_cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
|
struct srpt_send_ioctx, cmd); |
|
struct srpt_rdma_ch *ch = ioctx->ch; |
|
struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx; |
|
|
|
WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE && |
|
!(ioctx->cmd.transport_state & CMD_T_ABORTED)); |
|
|
|
if (recv_ioctx) { |
|
WARN_ON_ONCE(!list_empty(&recv_ioctx->wait_list)); |
|
ioctx->recv_ioctx = NULL; |
|
srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
|
} |
|
|
|
if (ioctx->n_rw_ctx) { |
|
srpt_free_rw_ctxs(ch, ioctx); |
|
ioctx->n_rw_ctx = 0; |
|
} |
|
|
|
target_free_tag(se_cmd->se_sess, se_cmd); |
|
} |
|
|
|
/** |
|
* srpt_close_session - forcibly close a session |
|
* @se_sess: SCSI target session. |
|
* |
|
* Callback function invoked by the TCM core to clean up sessions associated |
|
* with a node ACL when the user invokes |
|
* rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id |
|
*/ |
|
static void srpt_close_session(struct se_session *se_sess) |
|
{ |
|
struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
|
|
|
srpt_disconnect_ch_sync(ch); |
|
} |
|
|
|
/** |
|
* srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB) |
|
* @se_sess: SCSI target session. |
|
* |
|
* A quote from RFC 4455 (SCSI-MIB) about this MIB object: |
|
* This object represents an arbitrary integer used to uniquely identify a |
|
* particular attached remote initiator port to a particular SCSI target port |
|
* within a particular SCSI target device within a particular SCSI instance. |
|
*/ |
|
static u32 srpt_sess_get_index(struct se_session *se_sess) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void srpt_set_default_node_attrs(struct se_node_acl *nacl) |
|
{ |
|
} |
|
|
|
/* Note: only used from inside debug printk's by the TCM core. */ |
|
static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) |
|
{ |
|
struct srpt_send_ioctx *ioctx; |
|
|
|
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); |
|
return ioctx->state; |
|
} |
|
|
|
static int srpt_parse_guid(u64 *guid, const char *name) |
|
{ |
|
u16 w[4]; |
|
int ret = -EINVAL; |
|
|
|
if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4) |
|
goto out; |
|
*guid = get_unaligned_be64(w); |
|
ret = 0; |
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* srpt_parse_i_port_id - parse an initiator port ID |
|
* @name: ASCII representation of a 128-bit initiator port ID. |
|
* @i_port_id: Binary 128-bit port ID. |
|
*/ |
|
static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) |
|
{ |
|
const char *p; |
|
unsigned len, count, leading_zero_bytes; |
|
int ret; |
|
|
|
p = name; |
|
if (strncasecmp(p, "0x", 2) == 0) |
|
p += 2; |
|
ret = -EINVAL; |
|
len = strlen(p); |
|
if (len % 2) |
|
goto out; |
|
count = min(len / 2, 16U); |
|
leading_zero_bytes = 16 - count; |
|
memset(i_port_id, 0, leading_zero_bytes); |
|
ret = hex2bin(i_port_id + leading_zero_bytes, p, count); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* |
|
* configfs callback function invoked for mkdir |
|
* /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id |
|
* |
|
* i_port_id must be an initiator port GUID, GID or IP address. See also the |
|
* target_alloc_session() calls in this driver. Examples of valid initiator |
|
* port IDs: |
|
* 0x0000000000000000505400fffe4a0b7b |
|
* 0000000000000000505400fffe4a0b7b |
|
* 5054:00ff:fe4a:0b7b |
|
* 192.168.122.76 |
|
*/ |
|
static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
|
{ |
|
struct sockaddr_storage sa; |
|
u64 guid; |
|
u8 i_port_id[16]; |
|
int ret; |
|
|
|
ret = srpt_parse_guid(&guid, name); |
|
if (ret < 0) |
|
ret = srpt_parse_i_port_id(i_port_id, name); |
|
if (ret < 0) |
|
ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL, |
|
&sa); |
|
if (ret < 0) |
|
pr_err("invalid initiator port ID %s\n", name); |
|
return ret; |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
|
char *page) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rdma_size); |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(page, 0, &val); |
|
if (ret < 0) { |
|
pr_err("kstrtoul() failed with ret: %d\n", ret); |
|
return -EINVAL; |
|
} |
|
if (val > MAX_SRPT_RDMA_SIZE) { |
|
pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, |
|
MAX_SRPT_RDMA_SIZE); |
|
return -EINVAL; |
|
} |
|
if (val < DEFAULT_MAX_RDMA_SIZE) { |
|
pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", |
|
val, DEFAULT_MAX_RDMA_SIZE); |
|
return -EINVAL; |
|
} |
|
sport->port_attrib.srp_max_rdma_size = val; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
|
char *page) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rsp_size); |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(page, 0, &val); |
|
if (ret < 0) { |
|
pr_err("kstrtoul() failed with ret: %d\n", ret); |
|
return -EINVAL; |
|
} |
|
if (val > MAX_SRPT_RSP_SIZE) { |
|
pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, |
|
MAX_SRPT_RSP_SIZE); |
|
return -EINVAL; |
|
} |
|
if (val < MIN_MAX_RSP_SIZE) { |
|
pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, |
|
MIN_MAX_RSP_SIZE); |
|
return -EINVAL; |
|
} |
|
sport->port_attrib.srp_max_rsp_size = val; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
|
char *page) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_sq_size); |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
unsigned long val; |
|
int ret; |
|
|
|
ret = kstrtoul(page, 0, &val); |
|
if (ret < 0) { |
|
pr_err("kstrtoul() failed with ret: %d\n", ret); |
|
return -EINVAL; |
|
} |
|
if (val > MAX_SRPT_SRQ_SIZE) { |
|
pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, |
|
MAX_SRPT_SRQ_SIZE); |
|
return -EINVAL; |
|
} |
|
if (val < MIN_SRPT_SRQ_SIZE) { |
|
pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, |
|
MIN_SRPT_SRQ_SIZE); |
|
return -EINVAL; |
|
} |
|
sport->port_attrib.srp_sq_size = val; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item, |
|
char *page) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
|
|
return sysfs_emit(page, "%d\n", sport->port_attrib.use_srq); |
|
} |
|
|
|
static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = attrib_to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
struct srpt_device *sdev = sport->sdev; |
|
unsigned long val; |
|
bool enabled; |
|
int ret; |
|
|
|
ret = kstrtoul(page, 0, &val); |
|
if (ret < 0) |
|
return ret; |
|
if (val != !!val) |
|
return -EINVAL; |
|
|
|
ret = mutex_lock_interruptible(&sdev->sdev_mutex); |
|
if (ret < 0) |
|
return ret; |
|
ret = mutex_lock_interruptible(&sport->mutex); |
|
if (ret < 0) |
|
goto unlock_sdev; |
|
enabled = sport->enabled; |
|
/* Log out all initiator systems before changing 'use_srq'. */ |
|
srpt_set_enabled(sport, false); |
|
sport->port_attrib.use_srq = val; |
|
srpt_use_srq(sdev, sport->port_attrib.use_srq); |
|
srpt_set_enabled(sport, enabled); |
|
ret = count; |
|
mutex_unlock(&sport->mutex); |
|
unlock_sdev: |
|
mutex_unlock(&sdev->sdev_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); |
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); |
|
CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq); |
|
|
|
static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { |
|
&srpt_tpg_attrib_attr_srp_max_rdma_size, |
|
&srpt_tpg_attrib_attr_srp_max_rsp_size, |
|
&srpt_tpg_attrib_attr_srp_sq_size, |
|
&srpt_tpg_attrib_attr_use_srq, |
|
NULL, |
|
}; |
|
|
|
static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr) |
|
{ |
|
struct rdma_cm_id *rdma_cm_id; |
|
int ret; |
|
|
|
rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler, |
|
NULL, RDMA_PS_TCP, IB_QPT_RC); |
|
if (IS_ERR(rdma_cm_id)) { |
|
pr_err("RDMA/CM ID creation failed: %ld\n", |
|
PTR_ERR(rdma_cm_id)); |
|
goto out; |
|
} |
|
|
|
ret = rdma_bind_addr(rdma_cm_id, listen_addr); |
|
if (ret) { |
|
char addr_str[64]; |
|
|
|
snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr); |
|
pr_err("Binding RDMA/CM ID to address %s failed: %d\n", |
|
addr_str, ret); |
|
rdma_destroy_id(rdma_cm_id); |
|
rdma_cm_id = ERR_PTR(ret); |
|
goto out; |
|
} |
|
|
|
ret = rdma_listen(rdma_cm_id, 128); |
|
if (ret) { |
|
pr_err("rdma_listen() failed: %d\n", ret); |
|
rdma_destroy_id(rdma_cm_id); |
|
rdma_cm_id = ERR_PTR(ret); |
|
} |
|
|
|
out: |
|
return rdma_cm_id; |
|
} |
|
|
|
static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page) |
|
{ |
|
return sysfs_emit(page, "%d\n", rdma_cm_port); |
|
} |
|
|
|
static ssize_t srpt_rdma_cm_port_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct sockaddr_in addr4 = { .sin_family = AF_INET }; |
|
struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 }; |
|
struct rdma_cm_id *new_id = NULL; |
|
u16 val; |
|
int ret; |
|
|
|
ret = kstrtou16(page, 0, &val); |
|
if (ret < 0) |
|
return ret; |
|
ret = count; |
|
if (rdma_cm_port == val) |
|
goto out; |
|
|
|
if (val) { |
|
addr6.sin6_port = cpu_to_be16(val); |
|
new_id = srpt_create_rdma_id((struct sockaddr *)&addr6); |
|
if (IS_ERR(new_id)) { |
|
addr4.sin_port = cpu_to_be16(val); |
|
new_id = srpt_create_rdma_id((struct sockaddr *)&addr4); |
|
if (IS_ERR(new_id)) { |
|
ret = PTR_ERR(new_id); |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
mutex_lock(&rdma_cm_mutex); |
|
rdma_cm_port = val; |
|
swap(rdma_cm_id, new_id); |
|
mutex_unlock(&rdma_cm_mutex); |
|
|
|
if (new_id) |
|
rdma_destroy_id(new_id); |
|
ret = count; |
|
out: |
|
return ret; |
|
} |
|
|
|
CONFIGFS_ATTR(srpt_, rdma_cm_port); |
|
|
|
static struct configfs_attribute *srpt_da_attrs[] = { |
|
&srpt_attr_rdma_cm_port, |
|
NULL, |
|
}; |
|
|
|
static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
|
{ |
|
struct se_portal_group *se_tpg = to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
|
|
return sysfs_emit(page, "%d\n", sport->enabled); |
|
} |
|
|
|
static ssize_t srpt_tpg_enable_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct se_portal_group *se_tpg = to_tpg(item); |
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
|
unsigned long tmp; |
|
int ret; |
|
|
|
ret = kstrtoul(page, 0, &tmp); |
|
if (ret < 0) { |
|
pr_err("Unable to extract srpt_tpg_store_enable\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if ((tmp != 0) && (tmp != 1)) { |
|
pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
|
return -EINVAL; |
|
} |
|
|
|
mutex_lock(&sport->mutex); |
|
srpt_set_enabled(sport, tmp); |
|
mutex_unlock(&sport->mutex); |
|
|
|
return count; |
|
} |
|
|
|
CONFIGFS_ATTR(srpt_tpg_, enable); |
|
|
|
static struct configfs_attribute *srpt_tpg_attrs[] = { |
|
&srpt_tpg_attr_enable, |
|
NULL, |
|
}; |
|
|
|
/** |
|
* srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg |
|
* @wwn: Corresponds to $driver/$port. |
|
* @name: $tpg. |
|
*/ |
|
static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, |
|
const char *name) |
|
{ |
|
struct srpt_port_id *sport_id = srpt_wwn_to_sport_id(wwn); |
|
struct srpt_tpg *stpg; |
|
int res = -ENOMEM; |
|
|
|
stpg = kzalloc(sizeof(*stpg), GFP_KERNEL); |
|
if (!stpg) |
|
return ERR_PTR(res); |
|
stpg->sport_id = sport_id; |
|
res = core_tpg_register(wwn, &stpg->tpg, SCSI_PROTOCOL_SRP); |
|
if (res) { |
|
kfree(stpg); |
|
return ERR_PTR(res); |
|
} |
|
|
|
mutex_lock(&sport_id->mutex); |
|
list_add_tail(&stpg->entry, &sport_id->tpg_list); |
|
mutex_unlock(&sport_id->mutex); |
|
|
|
return &stpg->tpg; |
|
} |
|
|
|
/** |
|
* srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg |
|
* @tpg: Target portal group to deregister. |
|
*/ |
|
static void srpt_drop_tpg(struct se_portal_group *tpg) |
|
{ |
|
struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg); |
|
struct srpt_port_id *sport_id = stpg->sport_id; |
|
struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
|
|
|
mutex_lock(&sport_id->mutex); |
|
list_del(&stpg->entry); |
|
mutex_unlock(&sport_id->mutex); |
|
|
|
sport->enabled = false; |
|
core_tpg_deregister(tpg); |
|
kfree(stpg); |
|
} |
|
|
|
/** |
|
* srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port |
|
* @tf: Not used. |
|
* @group: Not used. |
|
* @name: $port. |
|
*/ |
|
static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, |
|
struct config_group *group, |
|
const char *name) |
|
{ |
|
return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL); |
|
} |
|
|
|
/** |
|
* srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port |
|
* @wwn: $port. |
|
*/ |
|
static void srpt_drop_tport(struct se_wwn *wwn) |
|
{ |
|
} |
|
|
|
static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
|
{ |
|
return sysfs_emit(buf, "\n"); |
|
} |
|
|
|
CONFIGFS_ATTR_RO(srpt_wwn_, version); |
|
|
|
static struct configfs_attribute *srpt_wwn_attrs[] = { |
|
&srpt_wwn_attr_version, |
|
NULL, |
|
}; |
|
|
|
static const struct target_core_fabric_ops srpt_template = { |
|
.module = THIS_MODULE, |
|
.fabric_name = "srpt", |
|
.tpg_get_wwn = srpt_get_fabric_wwn, |
|
.tpg_get_tag = srpt_get_tag, |
|
.tpg_check_demo_mode = srpt_check_false, |
|
.tpg_check_demo_mode_cache = srpt_check_true, |
|
.tpg_check_demo_mode_write_protect = srpt_check_true, |
|
.tpg_check_prod_mode_write_protect = srpt_check_false, |
|
.tpg_get_inst_index = srpt_tpg_get_inst_index, |
|
.release_cmd = srpt_release_cmd, |
|
.check_stop_free = srpt_check_stop_free, |
|
.close_session = srpt_close_session, |
|
.sess_get_index = srpt_sess_get_index, |
|
.sess_get_initiator_sid = NULL, |
|
.write_pending = srpt_write_pending, |
|
.set_default_node_attributes = srpt_set_default_node_attrs, |
|
.get_cmd_state = srpt_get_tcm_cmd_state, |
|
.queue_data_in = srpt_queue_data_in, |
|
.queue_status = srpt_queue_status, |
|
.queue_tm_rsp = srpt_queue_tm_rsp, |
|
.aborted_task = srpt_aborted_task, |
|
/* |
|
* Setup function pointers for generic logic in |
|
* target_core_fabric_configfs.c |
|
*/ |
|
.fabric_make_wwn = srpt_make_tport, |
|
.fabric_drop_wwn = srpt_drop_tport, |
|
.fabric_make_tpg = srpt_make_tpg, |
|
.fabric_drop_tpg = srpt_drop_tpg, |
|
.fabric_init_nodeacl = srpt_init_nodeacl, |
|
|
|
.tfc_discovery_attrs = srpt_da_attrs, |
|
.tfc_wwn_attrs = srpt_wwn_attrs, |
|
.tfc_tpg_base_attrs = srpt_tpg_attrs, |
|
.tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, |
|
}; |
|
|
|
/** |
|
* srpt_init_module - kernel module initialization |
|
* |
|
* Note: Since ib_register_client() registers callback functions, and since at |
|
* least one of these callback functions (srpt_add_one()) calls target core |
|
* functions, this driver must be registered with the target core before |
|
* ib_register_client() is called. |
|
*/ |
|
static int __init srpt_init_module(void) |
|
{ |
|
int ret; |
|
|
|
ret = -EINVAL; |
|
if (srp_max_req_size < MIN_MAX_REQ_SIZE) { |
|
pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n", |
|
srp_max_req_size, MIN_MAX_REQ_SIZE); |
|
goto out; |
|
} |
|
|
|
if (srpt_srq_size < MIN_SRPT_SRQ_SIZE |
|
|| srpt_srq_size > MAX_SRPT_SRQ_SIZE) { |
|
pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n", |
|
srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); |
|
goto out; |
|
} |
|
|
|
ret = target_register_template(&srpt_template); |
|
if (ret) |
|
goto out; |
|
|
|
ret = ib_register_client(&srpt_client); |
|
if (ret) { |
|
pr_err("couldn't register IB client\n"); |
|
goto out_unregister_target; |
|
} |
|
|
|
return 0; |
|
|
|
out_unregister_target: |
|
target_unregister_template(&srpt_template); |
|
out: |
|
return ret; |
|
} |
|
|
|
static void __exit srpt_cleanup_module(void) |
|
{ |
|
if (rdma_cm_id) |
|
rdma_destroy_id(rdma_cm_id); |
|
ib_unregister_client(&srpt_client); |
|
target_unregister_template(&srpt_template); |
|
} |
|
|
|
module_init(srpt_init_module); |
|
module_exit(srpt_cleanup_module);
|
|
|