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607 lines
17 KiB
607 lines
17 KiB
/* |
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* Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved. |
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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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#include <linux/kernel.h> |
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#include <linux/in.h> |
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#include <linux/if.h> |
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#include <linux/netdevice.h> |
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#include <linux/inetdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <net/addrconf.h> |
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|
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#include "rds_single_path.h" |
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#include "rds.h" |
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#include "ib.h" |
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#include "ib_mr.h" |
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|
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static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE; |
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static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE; |
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unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT; |
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static atomic_t rds_ib_unloading; |
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|
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module_param(rds_ib_mr_1m_pool_size, int, 0444); |
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MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA"); |
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module_param(rds_ib_mr_8k_pool_size, int, 0444); |
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MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA"); |
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module_param(rds_ib_retry_count, int, 0444); |
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MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error"); |
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|
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/* |
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* we have a clumsy combination of RCU and a rwsem protecting this list |
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* because it is used both in the get_mr fast path and while blocking in |
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* the FMR flushing path. |
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*/ |
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DECLARE_RWSEM(rds_ib_devices_lock); |
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struct list_head rds_ib_devices; |
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|
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/* NOTE: if also grabbing ibdev lock, grab this first */ |
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DEFINE_SPINLOCK(ib_nodev_conns_lock); |
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LIST_HEAD(ib_nodev_conns); |
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static void rds_ib_nodev_connect(void) |
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{ |
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struct rds_ib_connection *ic; |
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spin_lock(&ib_nodev_conns_lock); |
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list_for_each_entry(ic, &ib_nodev_conns, ib_node) |
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rds_conn_connect_if_down(ic->conn); |
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spin_unlock(&ib_nodev_conns_lock); |
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} |
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static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev) |
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{ |
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struct rds_ib_connection *ic; |
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unsigned long flags; |
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spin_lock_irqsave(&rds_ibdev->spinlock, flags); |
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list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node) |
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rds_conn_path_drop(&ic->conn->c_path[0], true); |
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spin_unlock_irqrestore(&rds_ibdev->spinlock, flags); |
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} |
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/* |
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* rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references |
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* from interrupt context so we push freing off into a work struct in krdsd. |
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*/ |
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static void rds_ib_dev_free(struct work_struct *work) |
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{ |
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struct rds_ib_ipaddr *i_ipaddr, *i_next; |
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struct rds_ib_device *rds_ibdev = container_of(work, |
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struct rds_ib_device, free_work); |
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|
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if (rds_ibdev->mr_8k_pool) |
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rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool); |
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if (rds_ibdev->mr_1m_pool) |
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rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool); |
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if (rds_ibdev->pd) |
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ib_dealloc_pd(rds_ibdev->pd); |
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list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) { |
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list_del(&i_ipaddr->list); |
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kfree(i_ipaddr); |
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} |
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kfree(rds_ibdev->vector_load); |
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kfree(rds_ibdev); |
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} |
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void rds_ib_dev_put(struct rds_ib_device *rds_ibdev) |
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{ |
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BUG_ON(refcount_read(&rds_ibdev->refcount) == 0); |
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if (refcount_dec_and_test(&rds_ibdev->refcount)) |
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queue_work(rds_wq, &rds_ibdev->free_work); |
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} |
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static int rds_ib_add_one(struct ib_device *device) |
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{ |
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struct rds_ib_device *rds_ibdev; |
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int ret; |
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/* Only handle IB (no iWARP) devices */ |
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if (device->node_type != RDMA_NODE_IB_CA) |
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return -EOPNOTSUPP; |
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|
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/* Device must support FRWR */ |
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if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) |
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return -EOPNOTSUPP; |
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rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL, |
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ibdev_to_node(device)); |
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if (!rds_ibdev) |
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return -ENOMEM; |
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spin_lock_init(&rds_ibdev->spinlock); |
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refcount_set(&rds_ibdev->refcount, 1); |
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INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); |
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INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); |
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INIT_LIST_HEAD(&rds_ibdev->conn_list); |
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rds_ibdev->max_wrs = device->attrs.max_qp_wr; |
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rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE); |
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rds_ibdev->odp_capable = |
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!!(device->attrs.device_cap_flags & |
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IB_DEVICE_ON_DEMAND_PAGING) && |
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!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps & |
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IB_ODP_SUPPORT_WRITE) && |
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!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps & |
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IB_ODP_SUPPORT_READ); |
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rds_ibdev->max_1m_mrs = device->attrs.max_mr ? |
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min_t(unsigned int, (device->attrs.max_mr / 2), |
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rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size; |
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rds_ibdev->max_8k_mrs = device->attrs.max_mr ? |
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min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE), |
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rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size; |
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rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom; |
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rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom; |
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rds_ibdev->vector_load = kcalloc(device->num_comp_vectors, |
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sizeof(int), |
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GFP_KERNEL); |
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if (!rds_ibdev->vector_load) { |
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pr_err("RDS/IB: %s failed to allocate vector memory\n", |
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__func__); |
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ret = -ENOMEM; |
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goto put_dev; |
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} |
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rds_ibdev->dev = device; |
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rds_ibdev->pd = ib_alloc_pd(device, 0); |
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if (IS_ERR(rds_ibdev->pd)) { |
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ret = PTR_ERR(rds_ibdev->pd); |
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rds_ibdev->pd = NULL; |
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goto put_dev; |
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} |
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rds_ibdev->mr_1m_pool = |
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rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL); |
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if (IS_ERR(rds_ibdev->mr_1m_pool)) { |
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ret = PTR_ERR(rds_ibdev->mr_1m_pool); |
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rds_ibdev->mr_1m_pool = NULL; |
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goto put_dev; |
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} |
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rds_ibdev->mr_8k_pool = |
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rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL); |
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if (IS_ERR(rds_ibdev->mr_8k_pool)) { |
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ret = PTR_ERR(rds_ibdev->mr_8k_pool); |
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rds_ibdev->mr_8k_pool = NULL; |
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goto put_dev; |
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} |
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rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, max_1m_mrs = %d, max_8k_mrs = %d\n", |
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device->attrs.max_mr, rds_ibdev->max_wrs, rds_ibdev->max_sge, |
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rds_ibdev->max_1m_mrs, rds_ibdev->max_8k_mrs); |
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pr_info("RDS/IB: %s: added\n", device->name); |
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down_write(&rds_ib_devices_lock); |
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list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices); |
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up_write(&rds_ib_devices_lock); |
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refcount_inc(&rds_ibdev->refcount); |
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ib_set_client_data(device, &rds_ib_client, rds_ibdev); |
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rds_ib_nodev_connect(); |
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return 0; |
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put_dev: |
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rds_ib_dev_put(rds_ibdev); |
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return ret; |
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} |
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/* |
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* New connections use this to find the device to associate with the |
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* connection. It's not in the fast path so we're not concerned about the |
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* performance of the IB call. (As of this writing, it uses an interrupt |
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* blocking spinlock to serialize walking a per-device list of all registered |
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* clients.) |
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* |
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* RCU is used to handle incoming connections racing with device teardown. |
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* Rather than use a lock to serialize removal from the client_data and |
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* getting a new reference, we use an RCU grace period. The destruction |
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* path removes the device from client_data and then waits for all RCU |
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* readers to finish. |
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* |
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* A new connection can get NULL from this if its arriving on a |
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* device that is in the process of being removed. |
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*/ |
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struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device) |
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{ |
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struct rds_ib_device *rds_ibdev; |
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rcu_read_lock(); |
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rds_ibdev = ib_get_client_data(device, &rds_ib_client); |
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if (rds_ibdev) |
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refcount_inc(&rds_ibdev->refcount); |
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rcu_read_unlock(); |
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return rds_ibdev; |
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} |
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/* |
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* The IB stack is letting us know that a device is going away. This can |
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* happen if the underlying HCA driver is removed or if PCI hotplug is removing |
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* the pci function, for example. |
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* |
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* This can be called at any time and can be racing with any other RDS path. |
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*/ |
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static void rds_ib_remove_one(struct ib_device *device, void *client_data) |
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{ |
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struct rds_ib_device *rds_ibdev = client_data; |
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rds_ib_dev_shutdown(rds_ibdev); |
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/* stop connection attempts from getting a reference to this device. */ |
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ib_set_client_data(device, &rds_ib_client, NULL); |
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down_write(&rds_ib_devices_lock); |
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list_del_rcu(&rds_ibdev->list); |
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up_write(&rds_ib_devices_lock); |
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/* |
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* This synchronize rcu is waiting for readers of both the ib |
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* client data and the devices list to finish before we drop |
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* both of those references. |
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*/ |
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synchronize_rcu(); |
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rds_ib_dev_put(rds_ibdev); |
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rds_ib_dev_put(rds_ibdev); |
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} |
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struct ib_client rds_ib_client = { |
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.name = "rds_ib", |
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.add = rds_ib_add_one, |
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.remove = rds_ib_remove_one |
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}; |
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static int rds_ib_conn_info_visitor(struct rds_connection *conn, |
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void *buffer) |
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{ |
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struct rds_info_rdma_connection *iinfo = buffer; |
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struct rds_ib_connection *ic = conn->c_transport_data; |
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|
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/* We will only ever look at IB transports */ |
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if (conn->c_trans != &rds_ib_transport) |
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return 0; |
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if (conn->c_isv6) |
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return 0; |
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iinfo->src_addr = conn->c_laddr.s6_addr32[3]; |
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iinfo->dst_addr = conn->c_faddr.s6_addr32[3]; |
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if (ic) { |
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iinfo->tos = conn->c_tos; |
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iinfo->sl = ic->i_sl; |
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} |
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|
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memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); |
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memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); |
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if (rds_conn_state(conn) == RDS_CONN_UP) { |
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struct rds_ib_device *rds_ibdev; |
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rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid, |
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(union ib_gid *)&iinfo->dst_gid); |
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rds_ibdev = ic->rds_ibdev; |
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iinfo->max_send_wr = ic->i_send_ring.w_nr; |
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iinfo->max_recv_wr = ic->i_recv_ring.w_nr; |
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iinfo->max_send_sge = rds_ibdev->max_sge; |
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rds_ib_get_mr_info(rds_ibdev, iinfo); |
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iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs); |
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} |
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return 1; |
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} |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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/* IPv6 version of rds_ib_conn_info_visitor(). */ |
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static int rds6_ib_conn_info_visitor(struct rds_connection *conn, |
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void *buffer) |
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{ |
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struct rds6_info_rdma_connection *iinfo6 = buffer; |
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struct rds_ib_connection *ic = conn->c_transport_data; |
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|
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/* We will only ever look at IB transports */ |
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if (conn->c_trans != &rds_ib_transport) |
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return 0; |
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iinfo6->src_addr = conn->c_laddr; |
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iinfo6->dst_addr = conn->c_faddr; |
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if (ic) { |
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iinfo6->tos = conn->c_tos; |
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iinfo6->sl = ic->i_sl; |
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} |
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|
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memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid)); |
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memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid)); |
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|
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if (rds_conn_state(conn) == RDS_CONN_UP) { |
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struct rds_ib_device *rds_ibdev; |
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rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid, |
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(union ib_gid *)&iinfo6->dst_gid); |
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rds_ibdev = ic->rds_ibdev; |
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iinfo6->max_send_wr = ic->i_send_ring.w_nr; |
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iinfo6->max_recv_wr = ic->i_recv_ring.w_nr; |
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iinfo6->max_send_sge = rds_ibdev->max_sge; |
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rds6_ib_get_mr_info(rds_ibdev, iinfo6); |
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iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs); |
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} |
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return 1; |
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} |
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#endif |
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static void rds_ib_ic_info(struct socket *sock, unsigned int len, |
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struct rds_info_iterator *iter, |
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struct rds_info_lengths *lens) |
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{ |
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u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8]; |
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|
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rds_for_each_conn_info(sock, len, iter, lens, |
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rds_ib_conn_info_visitor, |
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buffer, |
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sizeof(struct rds_info_rdma_connection)); |
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} |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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/* IPv6 version of rds_ib_ic_info(). */ |
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static void rds6_ib_ic_info(struct socket *sock, unsigned int len, |
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struct rds_info_iterator *iter, |
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struct rds_info_lengths *lens) |
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{ |
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u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8]; |
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|
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rds_for_each_conn_info(sock, len, iter, lens, |
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rds6_ib_conn_info_visitor, |
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buffer, |
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sizeof(struct rds6_info_rdma_connection)); |
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} |
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#endif |
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|
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/* |
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* Early RDS/IB was built to only bind to an address if there is an IPoIB |
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* device with that address set. |
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* |
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* If it were me, I'd advocate for something more flexible. Sending and |
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* receiving should be device-agnostic. Transports would try and maintain |
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* connections between peers who have messages queued. Userspace would be |
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* allowed to influence which paths have priority. We could call userspace |
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* asserting this policy "routing". |
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*/ |
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static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr, |
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__u32 scope_id) |
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{ |
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int ret; |
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struct rdma_cm_id *cm_id; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct sockaddr_in6 sin6; |
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#endif |
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struct sockaddr_in sin; |
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struct sockaddr *sa; |
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bool isv4; |
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|
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isv4 = ipv6_addr_v4mapped(addr); |
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/* Create a CMA ID and try to bind it. This catches both |
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* IB and iWARP capable NICs. |
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*/ |
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cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, |
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NULL, RDMA_PS_TCP, IB_QPT_RC); |
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if (IS_ERR(cm_id)) |
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return PTR_ERR(cm_id); |
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|
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if (isv4) { |
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memset(&sin, 0, sizeof(sin)); |
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sin.sin_family = AF_INET; |
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sin.sin_addr.s_addr = addr->s6_addr32[3]; |
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sa = (struct sockaddr *)&sin; |
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} else { |
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#if IS_ENABLED(CONFIG_IPV6) |
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memset(&sin6, 0, sizeof(sin6)); |
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sin6.sin6_family = AF_INET6; |
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sin6.sin6_addr = *addr; |
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sin6.sin6_scope_id = scope_id; |
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sa = (struct sockaddr *)&sin6; |
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|
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/* XXX Do a special IPv6 link local address check here. The |
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* reason is that rdma_bind_addr() always succeeds with IPv6 |
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* link local address regardless it is indeed configured in a |
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* system. |
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*/ |
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if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) { |
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struct net_device *dev; |
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|
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if (scope_id == 0) { |
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ret = -EADDRNOTAVAIL; |
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goto out; |
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} |
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|
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/* Use init_net for now as RDS is not network |
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* name space aware. |
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*/ |
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dev = dev_get_by_index(&init_net, scope_id); |
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if (!dev) { |
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ret = -EADDRNOTAVAIL; |
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goto out; |
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} |
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if (!ipv6_chk_addr(&init_net, addr, dev, 1)) { |
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dev_put(dev); |
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ret = -EADDRNOTAVAIL; |
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goto out; |
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} |
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dev_put(dev); |
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} |
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#else |
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ret = -EADDRNOTAVAIL; |
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goto out; |
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#endif |
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} |
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|
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/* rdma_bind_addr will only succeed for IB & iWARP devices */ |
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ret = rdma_bind_addr(cm_id, sa); |
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/* due to this, we will claim to support iWARP devices unless we |
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check node_type. */ |
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if (ret || !cm_id->device || |
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cm_id->device->node_type != RDMA_NODE_IB_CA) |
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ret = -EADDRNOTAVAIL; |
|
|
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rdsdebug("addr %pI6c%%%u ret %d node type %d\n", |
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addr, scope_id, ret, |
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cm_id->device ? cm_id->device->node_type : -1); |
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|
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out: |
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rdma_destroy_id(cm_id); |
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|
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return ret; |
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} |
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|
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static void rds_ib_unregister_client(void) |
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{ |
|
ib_unregister_client(&rds_ib_client); |
|
/* wait for rds_ib_dev_free() to complete */ |
|
flush_workqueue(rds_wq); |
|
} |
|
|
|
static void rds_ib_set_unloading(void) |
|
{ |
|
atomic_set(&rds_ib_unloading, 1); |
|
} |
|
|
|
static bool rds_ib_is_unloading(struct rds_connection *conn) |
|
{ |
|
struct rds_conn_path *cp = &conn->c_path[0]; |
|
|
|
return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) || |
|
atomic_read(&rds_ib_unloading) != 0); |
|
} |
|
|
|
void rds_ib_exit(void) |
|
{ |
|
rds_ib_set_unloading(); |
|
synchronize_rcu(); |
|
rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info); |
|
#endif |
|
rds_ib_unregister_client(); |
|
rds_ib_destroy_nodev_conns(); |
|
rds_ib_sysctl_exit(); |
|
rds_ib_recv_exit(); |
|
rds_trans_unregister(&rds_ib_transport); |
|
rds_ib_mr_exit(); |
|
} |
|
|
|
static u8 rds_ib_get_tos_map(u8 tos) |
|
{ |
|
/* 1:1 user to transport map for RDMA transport. |
|
* In future, if custom map is desired, hook can export |
|
* user configurable map. |
|
*/ |
|
return tos; |
|
} |
|
|
|
struct rds_transport rds_ib_transport = { |
|
.laddr_check = rds_ib_laddr_check, |
|
.xmit_path_complete = rds_ib_xmit_path_complete, |
|
.xmit = rds_ib_xmit, |
|
.xmit_rdma = rds_ib_xmit_rdma, |
|
.xmit_atomic = rds_ib_xmit_atomic, |
|
.recv_path = rds_ib_recv_path, |
|
.conn_alloc = rds_ib_conn_alloc, |
|
.conn_free = rds_ib_conn_free, |
|
.conn_path_connect = rds_ib_conn_path_connect, |
|
.conn_path_shutdown = rds_ib_conn_path_shutdown, |
|
.inc_copy_to_user = rds_ib_inc_copy_to_user, |
|
.inc_free = rds_ib_inc_free, |
|
.cm_initiate_connect = rds_ib_cm_initiate_connect, |
|
.cm_handle_connect = rds_ib_cm_handle_connect, |
|
.cm_connect_complete = rds_ib_cm_connect_complete, |
|
.stats_info_copy = rds_ib_stats_info_copy, |
|
.exit = rds_ib_exit, |
|
.get_mr = rds_ib_get_mr, |
|
.sync_mr = rds_ib_sync_mr, |
|
.free_mr = rds_ib_free_mr, |
|
.flush_mrs = rds_ib_flush_mrs, |
|
.get_tos_map = rds_ib_get_tos_map, |
|
.t_owner = THIS_MODULE, |
|
.t_name = "infiniband", |
|
.t_unloading = rds_ib_is_unloading, |
|
.t_type = RDS_TRANS_IB |
|
}; |
|
|
|
int rds_ib_init(void) |
|
{ |
|
int ret; |
|
|
|
INIT_LIST_HEAD(&rds_ib_devices); |
|
|
|
ret = rds_ib_mr_init(); |
|
if (ret) |
|
goto out; |
|
|
|
ret = ib_register_client(&rds_ib_client); |
|
if (ret) |
|
goto out_mr_exit; |
|
|
|
ret = rds_ib_sysctl_init(); |
|
if (ret) |
|
goto out_ibreg; |
|
|
|
ret = rds_ib_recv_init(); |
|
if (ret) |
|
goto out_sysctl; |
|
|
|
rds_trans_register(&rds_ib_transport); |
|
|
|
rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info); |
|
#endif |
|
|
|
goto out; |
|
|
|
out_sysctl: |
|
rds_ib_sysctl_exit(); |
|
out_ibreg: |
|
rds_ib_unregister_client(); |
|
out_mr_exit: |
|
rds_ib_mr_exit(); |
|
out: |
|
return ret; |
|
} |
|
|
|
MODULE_LICENSE("GPL");
|
|
|