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2514 lines
71 KiB
2514 lines
71 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2017, Microsoft Corporation. |
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* |
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* Author(s): Long Li <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/highmem.h> |
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#include "smbdirect.h" |
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#include "cifs_debug.h" |
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#include "cifsproto.h" |
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#include "smb2proto.h" |
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|
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static struct smbd_response *get_empty_queue_buffer( |
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struct smbd_connection *info); |
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static struct smbd_response *get_receive_buffer( |
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struct smbd_connection *info); |
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static void put_receive_buffer( |
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struct smbd_connection *info, |
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struct smbd_response *response); |
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static int allocate_receive_buffers(struct smbd_connection *info, int num_buf); |
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static void destroy_receive_buffers(struct smbd_connection *info); |
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|
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static void put_empty_packet( |
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struct smbd_connection *info, struct smbd_response *response); |
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static void enqueue_reassembly( |
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struct smbd_connection *info, |
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struct smbd_response *response, int data_length); |
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static struct smbd_response *_get_first_reassembly( |
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struct smbd_connection *info); |
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|
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static int smbd_post_recv( |
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struct smbd_connection *info, |
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struct smbd_response *response); |
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|
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static int smbd_post_send_empty(struct smbd_connection *info); |
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static int smbd_post_send_data( |
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struct smbd_connection *info, |
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struct kvec *iov, int n_vec, int remaining_data_length); |
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static int smbd_post_send_page(struct smbd_connection *info, |
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struct page *page, unsigned long offset, |
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size_t size, int remaining_data_length); |
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|
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static void destroy_mr_list(struct smbd_connection *info); |
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static int allocate_mr_list(struct smbd_connection *info); |
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|
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/* SMBD version number */ |
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#define SMBD_V1 0x0100 |
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|
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/* Port numbers for SMBD transport */ |
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#define SMB_PORT 445 |
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#define SMBD_PORT 5445 |
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|
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/* Address lookup and resolve timeout in ms */ |
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#define RDMA_RESOLVE_TIMEOUT 5000 |
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|
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/* SMBD negotiation timeout in seconds */ |
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#define SMBD_NEGOTIATE_TIMEOUT 120 |
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|
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/* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */ |
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#define SMBD_MIN_RECEIVE_SIZE 128 |
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#define SMBD_MIN_FRAGMENTED_SIZE 131072 |
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|
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/* |
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* Default maximum number of RDMA read/write outstanding on this connection |
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* This value is possibly decreased during QP creation on hardware limit |
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*/ |
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#define SMBD_CM_RESPONDER_RESOURCES 32 |
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|
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/* Maximum number of retries on data transfer operations */ |
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#define SMBD_CM_RETRY 6 |
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/* No need to retry on Receiver Not Ready since SMBD manages credits */ |
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#define SMBD_CM_RNR_RETRY 0 |
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|
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/* |
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* User configurable initial values per SMBD transport connection |
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* as defined in [MS-SMBD] 3.1.1.1 |
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* Those may change after a SMBD negotiation |
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*/ |
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/* The local peer's maximum number of credits to grant to the peer */ |
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int smbd_receive_credit_max = 255; |
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|
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/* The remote peer's credit request of local peer */ |
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int smbd_send_credit_target = 255; |
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|
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/* The maximum single message size can be sent to remote peer */ |
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int smbd_max_send_size = 1364; |
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|
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/* The maximum fragmented upper-layer payload receive size supported */ |
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int smbd_max_fragmented_recv_size = 1024 * 1024; |
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|
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/* The maximum single-message size which can be received */ |
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int smbd_max_receive_size = 8192; |
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|
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/* The timeout to initiate send of a keepalive message on idle */ |
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int smbd_keep_alive_interval = 120; |
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/* |
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* User configurable initial values for RDMA transport |
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* The actual values used may be lower and are limited to hardware capabilities |
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*/ |
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/* Default maximum number of SGEs in a RDMA write/read */ |
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int smbd_max_frmr_depth = 2048; |
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|
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/* If payload is less than this byte, use RDMA send/recv not read/write */ |
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int rdma_readwrite_threshold = 4096; |
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|
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/* Transport logging functions |
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* Logging are defined as classes. They can be OR'ed to define the actual |
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* logging level via module parameter smbd_logging_class |
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* e.g. cifs.smbd_logging_class=0xa0 will log all log_rdma_recv() and |
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* log_rdma_event() |
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*/ |
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#define LOG_OUTGOING 0x1 |
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#define LOG_INCOMING 0x2 |
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#define LOG_READ 0x4 |
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#define LOG_WRITE 0x8 |
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#define LOG_RDMA_SEND 0x10 |
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#define LOG_RDMA_RECV 0x20 |
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#define LOG_KEEP_ALIVE 0x40 |
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#define LOG_RDMA_EVENT 0x80 |
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#define LOG_RDMA_MR 0x100 |
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static unsigned int smbd_logging_class; |
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module_param(smbd_logging_class, uint, 0644); |
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MODULE_PARM_DESC(smbd_logging_class, |
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"Logging class for SMBD transport 0x0 to 0x100"); |
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|
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#define ERR 0x0 |
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#define INFO 0x1 |
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static unsigned int smbd_logging_level = ERR; |
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module_param(smbd_logging_level, uint, 0644); |
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MODULE_PARM_DESC(smbd_logging_level, |
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"Logging level for SMBD transport, 0 (default): error, 1: info"); |
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|
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#define log_rdma(level, class, fmt, args...) \ |
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do { \ |
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if (level <= smbd_logging_level || class & smbd_logging_class) \ |
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cifs_dbg(VFS, "%s:%d " fmt, __func__, __LINE__, ##args);\ |
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} while (0) |
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|
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#define log_outgoing(level, fmt, args...) \ |
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log_rdma(level, LOG_OUTGOING, fmt, ##args) |
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#define log_incoming(level, fmt, args...) \ |
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log_rdma(level, LOG_INCOMING, fmt, ##args) |
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#define log_read(level, fmt, args...) log_rdma(level, LOG_READ, fmt, ##args) |
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#define log_write(level, fmt, args...) log_rdma(level, LOG_WRITE, fmt, ##args) |
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#define log_rdma_send(level, fmt, args...) \ |
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log_rdma(level, LOG_RDMA_SEND, fmt, ##args) |
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#define log_rdma_recv(level, fmt, args...) \ |
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log_rdma(level, LOG_RDMA_RECV, fmt, ##args) |
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#define log_keep_alive(level, fmt, args...) \ |
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log_rdma(level, LOG_KEEP_ALIVE, fmt, ##args) |
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#define log_rdma_event(level, fmt, args...) \ |
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log_rdma(level, LOG_RDMA_EVENT, fmt, ##args) |
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#define log_rdma_mr(level, fmt, args...) \ |
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log_rdma(level, LOG_RDMA_MR, fmt, ##args) |
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|
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static void smbd_disconnect_rdma_work(struct work_struct *work) |
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{ |
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struct smbd_connection *info = |
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container_of(work, struct smbd_connection, disconnect_work); |
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|
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if (info->transport_status == SMBD_CONNECTED) { |
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info->transport_status = SMBD_DISCONNECTING; |
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rdma_disconnect(info->id); |
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} |
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} |
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static void smbd_disconnect_rdma_connection(struct smbd_connection *info) |
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{ |
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queue_work(info->workqueue, &info->disconnect_work); |
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} |
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|
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/* Upcall from RDMA CM */ |
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static int smbd_conn_upcall( |
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struct rdma_cm_id *id, struct rdma_cm_event *event) |
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{ |
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struct smbd_connection *info = id->context; |
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|
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log_rdma_event(INFO, "event=%d status=%d\n", |
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event->event, event->status); |
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|
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switch (event->event) { |
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case RDMA_CM_EVENT_ADDR_RESOLVED: |
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case RDMA_CM_EVENT_ROUTE_RESOLVED: |
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info->ri_rc = 0; |
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complete(&info->ri_done); |
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break; |
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|
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case RDMA_CM_EVENT_ADDR_ERROR: |
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info->ri_rc = -EHOSTUNREACH; |
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complete(&info->ri_done); |
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break; |
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case RDMA_CM_EVENT_ROUTE_ERROR: |
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info->ri_rc = -ENETUNREACH; |
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complete(&info->ri_done); |
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break; |
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|
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case RDMA_CM_EVENT_ESTABLISHED: |
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log_rdma_event(INFO, "connected event=%d\n", event->event); |
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info->transport_status = SMBD_CONNECTED; |
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wake_up_interruptible(&info->conn_wait); |
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break; |
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|
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case RDMA_CM_EVENT_CONNECT_ERROR: |
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case RDMA_CM_EVENT_UNREACHABLE: |
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case RDMA_CM_EVENT_REJECTED: |
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log_rdma_event(INFO, "connecting failed event=%d\n", event->event); |
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info->transport_status = SMBD_DISCONNECTED; |
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wake_up_interruptible(&info->conn_wait); |
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break; |
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|
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case RDMA_CM_EVENT_DEVICE_REMOVAL: |
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case RDMA_CM_EVENT_DISCONNECTED: |
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/* This happenes when we fail the negotiation */ |
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if (info->transport_status == SMBD_NEGOTIATE_FAILED) { |
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info->transport_status = SMBD_DISCONNECTED; |
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wake_up(&info->conn_wait); |
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break; |
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} |
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info->transport_status = SMBD_DISCONNECTED; |
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wake_up_interruptible(&info->disconn_wait); |
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wake_up_interruptible(&info->wait_reassembly_queue); |
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wake_up_interruptible_all(&info->wait_send_queue); |
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break; |
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|
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default: |
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break; |
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} |
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|
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return 0; |
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} |
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|
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/* Upcall from RDMA QP */ |
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static void |
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smbd_qp_async_error_upcall(struct ib_event *event, void *context) |
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{ |
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struct smbd_connection *info = context; |
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log_rdma_event(ERR, "%s on device %s info %p\n", |
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ib_event_msg(event->event), event->device->name, info); |
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|
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switch (event->event) { |
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case IB_EVENT_CQ_ERR: |
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case IB_EVENT_QP_FATAL: |
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smbd_disconnect_rdma_connection(info); |
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break; |
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default: |
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break; |
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} |
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} |
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static inline void *smbd_request_payload(struct smbd_request *request) |
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{ |
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return (void *)request->packet; |
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} |
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static inline void *smbd_response_payload(struct smbd_response *response) |
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{ |
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return (void *)response->packet; |
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} |
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/* Called when a RDMA send is done */ |
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static void send_done(struct ib_cq *cq, struct ib_wc *wc) |
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{ |
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int i; |
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struct smbd_request *request = |
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container_of(wc->wr_cqe, struct smbd_request, cqe); |
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log_rdma_send(INFO, "smbd_request %p completed wc->status=%d\n", |
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request, wc->status); |
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if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { |
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log_rdma_send(ERR, "wc->status=%d wc->opcode=%d\n", |
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wc->status, wc->opcode); |
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smbd_disconnect_rdma_connection(request->info); |
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} |
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for (i = 0; i < request->num_sge; i++) |
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ib_dma_unmap_single(request->info->id->device, |
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request->sge[i].addr, |
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request->sge[i].length, |
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DMA_TO_DEVICE); |
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if (atomic_dec_and_test(&request->info->send_pending)) |
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wake_up(&request->info->wait_send_pending); |
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wake_up(&request->info->wait_post_send); |
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mempool_free(request, request->info->request_mempool); |
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} |
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static void dump_smbd_negotiate_resp(struct smbd_negotiate_resp *resp) |
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{ |
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log_rdma_event(INFO, "resp message min_version %u max_version %u negotiated_version %u credits_requested %u credits_granted %u status %u max_readwrite_size %u preferred_send_size %u max_receive_size %u max_fragmented_size %u\n", |
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resp->min_version, resp->max_version, |
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resp->negotiated_version, resp->credits_requested, |
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resp->credits_granted, resp->status, |
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resp->max_readwrite_size, resp->preferred_send_size, |
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resp->max_receive_size, resp->max_fragmented_size); |
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} |
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/* |
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* Process a negotiation response message, according to [MS-SMBD]3.1.5.7 |
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* response, packet_length: the negotiation response message |
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* return value: true if negotiation is a success, false if failed |
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*/ |
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static bool process_negotiation_response( |
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struct smbd_response *response, int packet_length) |
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{ |
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struct smbd_connection *info = response->info; |
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struct smbd_negotiate_resp *packet = smbd_response_payload(response); |
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|
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if (packet_length < sizeof(struct smbd_negotiate_resp)) { |
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log_rdma_event(ERR, |
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"error: packet_length=%d\n", packet_length); |
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return false; |
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} |
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|
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if (le16_to_cpu(packet->negotiated_version) != SMBD_V1) { |
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log_rdma_event(ERR, "error: negotiated_version=%x\n", |
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le16_to_cpu(packet->negotiated_version)); |
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return false; |
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} |
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info->protocol = le16_to_cpu(packet->negotiated_version); |
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|
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if (packet->credits_requested == 0) { |
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log_rdma_event(ERR, "error: credits_requested==0\n"); |
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return false; |
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} |
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info->receive_credit_target = le16_to_cpu(packet->credits_requested); |
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|
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if (packet->credits_granted == 0) { |
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log_rdma_event(ERR, "error: credits_granted==0\n"); |
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return false; |
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} |
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atomic_set(&info->send_credits, le16_to_cpu(packet->credits_granted)); |
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|
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atomic_set(&info->receive_credits, 0); |
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|
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if (le32_to_cpu(packet->preferred_send_size) > info->max_receive_size) { |
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log_rdma_event(ERR, "error: preferred_send_size=%d\n", |
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le32_to_cpu(packet->preferred_send_size)); |
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return false; |
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} |
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info->max_receive_size = le32_to_cpu(packet->preferred_send_size); |
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|
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if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) { |
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log_rdma_event(ERR, "error: max_receive_size=%d\n", |
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le32_to_cpu(packet->max_receive_size)); |
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return false; |
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} |
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info->max_send_size = min_t(int, info->max_send_size, |
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le32_to_cpu(packet->max_receive_size)); |
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|
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if (le32_to_cpu(packet->max_fragmented_size) < |
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SMBD_MIN_FRAGMENTED_SIZE) { |
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log_rdma_event(ERR, "error: max_fragmented_size=%d\n", |
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le32_to_cpu(packet->max_fragmented_size)); |
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return false; |
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} |
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info->max_fragmented_send_size = |
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le32_to_cpu(packet->max_fragmented_size); |
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info->rdma_readwrite_threshold = |
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rdma_readwrite_threshold > info->max_fragmented_send_size ? |
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info->max_fragmented_send_size : |
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rdma_readwrite_threshold; |
|
|
|
|
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info->max_readwrite_size = min_t(u32, |
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le32_to_cpu(packet->max_readwrite_size), |
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info->max_frmr_depth * PAGE_SIZE); |
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info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE; |
|
|
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return true; |
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} |
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|
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static void smbd_post_send_credits(struct work_struct *work) |
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{ |
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int ret = 0; |
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int use_receive_queue = 1; |
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int rc; |
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struct smbd_response *response; |
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struct smbd_connection *info = |
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container_of(work, struct smbd_connection, |
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post_send_credits_work); |
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|
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if (info->transport_status != SMBD_CONNECTED) { |
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wake_up(&info->wait_receive_queues); |
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return; |
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} |
|
|
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if (info->receive_credit_target > |
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atomic_read(&info->receive_credits)) { |
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while (true) { |
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if (use_receive_queue) |
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response = get_receive_buffer(info); |
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else |
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response = get_empty_queue_buffer(info); |
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if (!response) { |
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/* now switch to emtpy packet queue */ |
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if (use_receive_queue) { |
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use_receive_queue = 0; |
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continue; |
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} else |
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break; |
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} |
|
|
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response->type = SMBD_TRANSFER_DATA; |
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response->first_segment = false; |
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rc = smbd_post_recv(info, response); |
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if (rc) { |
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log_rdma_recv(ERR, |
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"post_recv failed rc=%d\n", rc); |
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put_receive_buffer(info, response); |
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break; |
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} |
|
|
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ret++; |
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} |
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} |
|
|
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spin_lock(&info->lock_new_credits_offered); |
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info->new_credits_offered += ret; |
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spin_unlock(&info->lock_new_credits_offered); |
|
|
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/* Promptly send an immediate packet as defined in [MS-SMBD] 3.1.1.1 */ |
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info->send_immediate = true; |
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if (atomic_read(&info->receive_credits) < |
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info->receive_credit_target - 1) { |
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if (info->keep_alive_requested == KEEP_ALIVE_PENDING || |
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info->send_immediate) { |
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log_keep_alive(INFO, "send an empty message\n"); |
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smbd_post_send_empty(info); |
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} |
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} |
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} |
|
|
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/* Called from softirq, when recv is done */ |
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static void recv_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
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struct smbd_data_transfer *data_transfer; |
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struct smbd_response *response = |
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container_of(wc->wr_cqe, struct smbd_response, cqe); |
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struct smbd_connection *info = response->info; |
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int data_length = 0; |
|
|
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log_rdma_recv(INFO, "response=%p type=%d wc status=%d wc opcode %d byte_len=%d pkey_index=%x\n", |
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response, response->type, wc->status, wc->opcode, |
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wc->byte_len, wc->pkey_index); |
|
|
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if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { |
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log_rdma_recv(INFO, "wc->status=%d opcode=%d\n", |
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wc->status, wc->opcode); |
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smbd_disconnect_rdma_connection(info); |
|
goto error; |
|
} |
|
|
|
ib_dma_sync_single_for_cpu( |
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wc->qp->device, |
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response->sge.addr, |
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response->sge.length, |
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DMA_FROM_DEVICE); |
|
|
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switch (response->type) { |
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/* SMBD negotiation response */ |
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case SMBD_NEGOTIATE_RESP: |
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dump_smbd_negotiate_resp(smbd_response_payload(response)); |
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info->full_packet_received = true; |
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info->negotiate_done = |
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process_negotiation_response(response, wc->byte_len); |
|
complete(&info->negotiate_completion); |
|
break; |
|
|
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/* SMBD data transfer packet */ |
|
case SMBD_TRANSFER_DATA: |
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data_transfer = smbd_response_payload(response); |
|
data_length = le32_to_cpu(data_transfer->data_length); |
|
|
|
/* |
|
* If this is a packet with data playload place the data in |
|
* reassembly queue and wake up the reading thread |
|
*/ |
|
if (data_length) { |
|
if (info->full_packet_received) |
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response->first_segment = true; |
|
|
|
if (le32_to_cpu(data_transfer->remaining_data_length)) |
|
info->full_packet_received = false; |
|
else |
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info->full_packet_received = true; |
|
|
|
enqueue_reassembly( |
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info, |
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response, |
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data_length); |
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} else |
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put_empty_packet(info, response); |
|
|
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if (data_length) |
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wake_up_interruptible(&info->wait_reassembly_queue); |
|
|
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atomic_dec(&info->receive_credits); |
|
info->receive_credit_target = |
|
le16_to_cpu(data_transfer->credits_requested); |
|
if (le16_to_cpu(data_transfer->credits_granted)) { |
|
atomic_add(le16_to_cpu(data_transfer->credits_granted), |
|
&info->send_credits); |
|
/* |
|
* We have new send credits granted from remote peer |
|
* If any sender is waiting for credits, unblock it |
|
*/ |
|
wake_up_interruptible(&info->wait_send_queue); |
|
} |
|
|
|
log_incoming(INFO, "data flags %d data_offset %d data_length %d remaining_data_length %d\n", |
|
le16_to_cpu(data_transfer->flags), |
|
le32_to_cpu(data_transfer->data_offset), |
|
le32_to_cpu(data_transfer->data_length), |
|
le32_to_cpu(data_transfer->remaining_data_length)); |
|
|
|
/* Send a KEEP_ALIVE response right away if requested */ |
|
info->keep_alive_requested = KEEP_ALIVE_NONE; |
|
if (le16_to_cpu(data_transfer->flags) & |
|
SMB_DIRECT_RESPONSE_REQUESTED) { |
|
info->keep_alive_requested = KEEP_ALIVE_PENDING; |
|
} |
|
|
|
return; |
|
|
|
default: |
|
log_rdma_recv(ERR, |
|
"unexpected response type=%d\n", response->type); |
|
} |
|
|
|
error: |
|
put_receive_buffer(info, response); |
|
} |
|
|
|
static struct rdma_cm_id *smbd_create_id( |
|
struct smbd_connection *info, |
|
struct sockaddr *dstaddr, int port) |
|
{ |
|
struct rdma_cm_id *id; |
|
int rc; |
|
__be16 *sport; |
|
|
|
id = rdma_create_id(&init_net, smbd_conn_upcall, info, |
|
RDMA_PS_TCP, IB_QPT_RC); |
|
if (IS_ERR(id)) { |
|
rc = PTR_ERR(id); |
|
log_rdma_event(ERR, "rdma_create_id() failed %i\n", rc); |
|
return id; |
|
} |
|
|
|
if (dstaddr->sa_family == AF_INET6) |
|
sport = &((struct sockaddr_in6 *)dstaddr)->sin6_port; |
|
else |
|
sport = &((struct sockaddr_in *)dstaddr)->sin_port; |
|
|
|
*sport = htons(port); |
|
|
|
init_completion(&info->ri_done); |
|
info->ri_rc = -ETIMEDOUT; |
|
|
|
rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr, |
|
RDMA_RESOLVE_TIMEOUT); |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc); |
|
goto out; |
|
} |
|
wait_for_completion_interruptible_timeout( |
|
&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); |
|
rc = info->ri_rc; |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc); |
|
goto out; |
|
} |
|
|
|
info->ri_rc = -ETIMEDOUT; |
|
rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc); |
|
goto out; |
|
} |
|
wait_for_completion_interruptible_timeout( |
|
&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); |
|
rc = info->ri_rc; |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc); |
|
goto out; |
|
} |
|
|
|
return id; |
|
|
|
out: |
|
rdma_destroy_id(id); |
|
return ERR_PTR(rc); |
|
} |
|
|
|
/* |
|
* Test if FRWR (Fast Registration Work Requests) is supported on the device |
|
* This implementation requries FRWR on RDMA read/write |
|
* return value: true if it is supported |
|
*/ |
|
static bool frwr_is_supported(struct ib_device_attr *attrs) |
|
{ |
|
if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) |
|
return false; |
|
if (attrs->max_fast_reg_page_list_len == 0) |
|
return false; |
|
return true; |
|
} |
|
|
|
static int smbd_ia_open( |
|
struct smbd_connection *info, |
|
struct sockaddr *dstaddr, int port) |
|
{ |
|
int rc; |
|
|
|
info->id = smbd_create_id(info, dstaddr, port); |
|
if (IS_ERR(info->id)) { |
|
rc = PTR_ERR(info->id); |
|
goto out1; |
|
} |
|
|
|
if (!frwr_is_supported(&info->id->device->attrs)) { |
|
log_rdma_event(ERR, "Fast Registration Work Requests (FRWR) is not supported\n"); |
|
log_rdma_event(ERR, "Device capability flags = %llx max_fast_reg_page_list_len = %u\n", |
|
info->id->device->attrs.device_cap_flags, |
|
info->id->device->attrs.max_fast_reg_page_list_len); |
|
rc = -EPROTONOSUPPORT; |
|
goto out2; |
|
} |
|
info->max_frmr_depth = min_t(int, |
|
smbd_max_frmr_depth, |
|
info->id->device->attrs.max_fast_reg_page_list_len); |
|
info->mr_type = IB_MR_TYPE_MEM_REG; |
|
if (info->id->device->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) |
|
info->mr_type = IB_MR_TYPE_SG_GAPS; |
|
|
|
info->pd = ib_alloc_pd(info->id->device, 0); |
|
if (IS_ERR(info->pd)) { |
|
rc = PTR_ERR(info->pd); |
|
log_rdma_event(ERR, "ib_alloc_pd() returned %d\n", rc); |
|
goto out2; |
|
} |
|
|
|
return 0; |
|
|
|
out2: |
|
rdma_destroy_id(info->id); |
|
info->id = NULL; |
|
|
|
out1: |
|
return rc; |
|
} |
|
|
|
/* |
|
* Send a negotiation request message to the peer |
|
* The negotiation procedure is in [MS-SMBD] 3.1.5.2 and 3.1.5.3 |
|
* After negotiation, the transport is connected and ready for |
|
* carrying upper layer SMB payload |
|
*/ |
|
static int smbd_post_send_negotiate_req(struct smbd_connection *info) |
|
{ |
|
struct ib_send_wr send_wr; |
|
int rc = -ENOMEM; |
|
struct smbd_request *request; |
|
struct smbd_negotiate_req *packet; |
|
|
|
request = mempool_alloc(info->request_mempool, GFP_KERNEL); |
|
if (!request) |
|
return rc; |
|
|
|
request->info = info; |
|
|
|
packet = smbd_request_payload(request); |
|
packet->min_version = cpu_to_le16(SMBD_V1); |
|
packet->max_version = cpu_to_le16(SMBD_V1); |
|
packet->reserved = 0; |
|
packet->credits_requested = cpu_to_le16(info->send_credit_target); |
|
packet->preferred_send_size = cpu_to_le32(info->max_send_size); |
|
packet->max_receive_size = cpu_to_le32(info->max_receive_size); |
|
packet->max_fragmented_size = |
|
cpu_to_le32(info->max_fragmented_recv_size); |
|
|
|
request->num_sge = 1; |
|
request->sge[0].addr = ib_dma_map_single( |
|
info->id->device, (void *)packet, |
|
sizeof(*packet), DMA_TO_DEVICE); |
|
if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { |
|
rc = -EIO; |
|
goto dma_mapping_failed; |
|
} |
|
|
|
request->sge[0].length = sizeof(*packet); |
|
request->sge[0].lkey = info->pd->local_dma_lkey; |
|
|
|
ib_dma_sync_single_for_device( |
|
info->id->device, request->sge[0].addr, |
|
request->sge[0].length, DMA_TO_DEVICE); |
|
|
|
request->cqe.done = send_done; |
|
|
|
send_wr.next = NULL; |
|
send_wr.wr_cqe = &request->cqe; |
|
send_wr.sg_list = request->sge; |
|
send_wr.num_sge = request->num_sge; |
|
send_wr.opcode = IB_WR_SEND; |
|
send_wr.send_flags = IB_SEND_SIGNALED; |
|
|
|
log_rdma_send(INFO, "sge addr=%llx length=%x lkey=%x\n", |
|
request->sge[0].addr, |
|
request->sge[0].length, request->sge[0].lkey); |
|
|
|
atomic_inc(&info->send_pending); |
|
rc = ib_post_send(info->id->qp, &send_wr, NULL); |
|
if (!rc) |
|
return 0; |
|
|
|
/* if we reach here, post send failed */ |
|
log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); |
|
atomic_dec(&info->send_pending); |
|
ib_dma_unmap_single(info->id->device, request->sge[0].addr, |
|
request->sge[0].length, DMA_TO_DEVICE); |
|
|
|
smbd_disconnect_rdma_connection(info); |
|
|
|
dma_mapping_failed: |
|
mempool_free(request, info->request_mempool); |
|
return rc; |
|
} |
|
|
|
/* |
|
* Extend the credits to remote peer |
|
* This implements [MS-SMBD] 3.1.5.9 |
|
* The idea is that we should extend credits to remote peer as quickly as |
|
* it's allowed, to maintain data flow. We allocate as much receive |
|
* buffer as possible, and extend the receive credits to remote peer |
|
* return value: the new credtis being granted. |
|
*/ |
|
static int manage_credits_prior_sending(struct smbd_connection *info) |
|
{ |
|
int new_credits; |
|
|
|
spin_lock(&info->lock_new_credits_offered); |
|
new_credits = info->new_credits_offered; |
|
info->new_credits_offered = 0; |
|
spin_unlock(&info->lock_new_credits_offered); |
|
|
|
return new_credits; |
|
} |
|
|
|
/* |
|
* Check if we need to send a KEEP_ALIVE message |
|
* The idle connection timer triggers a KEEP_ALIVE message when expires |
|
* SMB_DIRECT_RESPONSE_REQUESTED is set in the message flag to have peer send |
|
* back a response. |
|
* return value: |
|
* 1 if SMB_DIRECT_RESPONSE_REQUESTED needs to be set |
|
* 0: otherwise |
|
*/ |
|
static int manage_keep_alive_before_sending(struct smbd_connection *info) |
|
{ |
|
if (info->keep_alive_requested == KEEP_ALIVE_PENDING) { |
|
info->keep_alive_requested = KEEP_ALIVE_SENT; |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
/* Post the send request */ |
|
static int smbd_post_send(struct smbd_connection *info, |
|
struct smbd_request *request) |
|
{ |
|
struct ib_send_wr send_wr; |
|
int rc, i; |
|
|
|
for (i = 0; i < request->num_sge; i++) { |
|
log_rdma_send(INFO, |
|
"rdma_request sge[%d] addr=%llu length=%u\n", |
|
i, request->sge[i].addr, request->sge[i].length); |
|
ib_dma_sync_single_for_device( |
|
info->id->device, |
|
request->sge[i].addr, |
|
request->sge[i].length, |
|
DMA_TO_DEVICE); |
|
} |
|
|
|
request->cqe.done = send_done; |
|
|
|
send_wr.next = NULL; |
|
send_wr.wr_cqe = &request->cqe; |
|
send_wr.sg_list = request->sge; |
|
send_wr.num_sge = request->num_sge; |
|
send_wr.opcode = IB_WR_SEND; |
|
send_wr.send_flags = IB_SEND_SIGNALED; |
|
|
|
rc = ib_post_send(info->id->qp, &send_wr, NULL); |
|
if (rc) { |
|
log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); |
|
smbd_disconnect_rdma_connection(info); |
|
rc = -EAGAIN; |
|
} else |
|
/* Reset timer for idle connection after packet is sent */ |
|
mod_delayed_work(info->workqueue, &info->idle_timer_work, |
|
info->keep_alive_interval*HZ); |
|
|
|
return rc; |
|
} |
|
|
|
static int smbd_post_send_sgl(struct smbd_connection *info, |
|
struct scatterlist *sgl, int data_length, int remaining_data_length) |
|
{ |
|
int num_sgs; |
|
int i, rc; |
|
int header_length; |
|
struct smbd_request *request; |
|
struct smbd_data_transfer *packet; |
|
int new_credits; |
|
struct scatterlist *sg; |
|
|
|
wait_credit: |
|
/* Wait for send credits. A SMBD packet needs one credit */ |
|
rc = wait_event_interruptible(info->wait_send_queue, |
|
atomic_read(&info->send_credits) > 0 || |
|
info->transport_status != SMBD_CONNECTED); |
|
if (rc) |
|
goto err_wait_credit; |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
log_outgoing(ERR, "disconnected not sending on wait_credit\n"); |
|
rc = -EAGAIN; |
|
goto err_wait_credit; |
|
} |
|
if (unlikely(atomic_dec_return(&info->send_credits) < 0)) { |
|
atomic_inc(&info->send_credits); |
|
goto wait_credit; |
|
} |
|
|
|
wait_send_queue: |
|
wait_event(info->wait_post_send, |
|
atomic_read(&info->send_pending) < info->send_credit_target || |
|
info->transport_status != SMBD_CONNECTED); |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
log_outgoing(ERR, "disconnected not sending on wait_send_queue\n"); |
|
rc = -EAGAIN; |
|
goto err_wait_send_queue; |
|
} |
|
|
|
if (unlikely(atomic_inc_return(&info->send_pending) > |
|
info->send_credit_target)) { |
|
atomic_dec(&info->send_pending); |
|
goto wait_send_queue; |
|
} |
|
|
|
request = mempool_alloc(info->request_mempool, GFP_KERNEL); |
|
if (!request) { |
|
rc = -ENOMEM; |
|
goto err_alloc; |
|
} |
|
|
|
request->info = info; |
|
|
|
/* Fill in the packet header */ |
|
packet = smbd_request_payload(request); |
|
packet->credits_requested = cpu_to_le16(info->send_credit_target); |
|
|
|
new_credits = manage_credits_prior_sending(info); |
|
atomic_add(new_credits, &info->receive_credits); |
|
packet->credits_granted = cpu_to_le16(new_credits); |
|
|
|
info->send_immediate = false; |
|
|
|
packet->flags = 0; |
|
if (manage_keep_alive_before_sending(info)) |
|
packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED); |
|
|
|
packet->reserved = 0; |
|
if (!data_length) |
|
packet->data_offset = 0; |
|
else |
|
packet->data_offset = cpu_to_le32(24); |
|
packet->data_length = cpu_to_le32(data_length); |
|
packet->remaining_data_length = cpu_to_le32(remaining_data_length); |
|
packet->padding = 0; |
|
|
|
log_outgoing(INFO, "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n", |
|
le16_to_cpu(packet->credits_requested), |
|
le16_to_cpu(packet->credits_granted), |
|
le32_to_cpu(packet->data_offset), |
|
le32_to_cpu(packet->data_length), |
|
le32_to_cpu(packet->remaining_data_length)); |
|
|
|
/* Map the packet to DMA */ |
|
header_length = sizeof(struct smbd_data_transfer); |
|
/* If this is a packet without payload, don't send padding */ |
|
if (!data_length) |
|
header_length = offsetof(struct smbd_data_transfer, padding); |
|
|
|
request->num_sge = 1; |
|
request->sge[0].addr = ib_dma_map_single(info->id->device, |
|
(void *)packet, |
|
header_length, |
|
DMA_TO_DEVICE); |
|
if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { |
|
rc = -EIO; |
|
request->sge[0].addr = 0; |
|
goto err_dma; |
|
} |
|
|
|
request->sge[0].length = header_length; |
|
request->sge[0].lkey = info->pd->local_dma_lkey; |
|
|
|
/* Fill in the packet data payload */ |
|
num_sgs = sgl ? sg_nents(sgl) : 0; |
|
for_each_sg(sgl, sg, num_sgs, i) { |
|
request->sge[i+1].addr = |
|
ib_dma_map_page(info->id->device, sg_page(sg), |
|
sg->offset, sg->length, DMA_TO_DEVICE); |
|
if (ib_dma_mapping_error( |
|
info->id->device, request->sge[i+1].addr)) { |
|
rc = -EIO; |
|
request->sge[i+1].addr = 0; |
|
goto err_dma; |
|
} |
|
request->sge[i+1].length = sg->length; |
|
request->sge[i+1].lkey = info->pd->local_dma_lkey; |
|
request->num_sge++; |
|
} |
|
|
|
rc = smbd_post_send(info, request); |
|
if (!rc) |
|
return 0; |
|
|
|
err_dma: |
|
for (i = 0; i < request->num_sge; i++) |
|
if (request->sge[i].addr) |
|
ib_dma_unmap_single(info->id->device, |
|
request->sge[i].addr, |
|
request->sge[i].length, |
|
DMA_TO_DEVICE); |
|
mempool_free(request, info->request_mempool); |
|
|
|
/* roll back receive credits and credits to be offered */ |
|
spin_lock(&info->lock_new_credits_offered); |
|
info->new_credits_offered += new_credits; |
|
spin_unlock(&info->lock_new_credits_offered); |
|
atomic_sub(new_credits, &info->receive_credits); |
|
|
|
err_alloc: |
|
if (atomic_dec_and_test(&info->send_pending)) |
|
wake_up(&info->wait_send_pending); |
|
|
|
err_wait_send_queue: |
|
/* roll back send credits and pending */ |
|
atomic_inc(&info->send_credits); |
|
|
|
err_wait_credit: |
|
return rc; |
|
} |
|
|
|
/* |
|
* Send a page |
|
* page: the page to send |
|
* offset: offset in the page to send |
|
* size: length in the page to send |
|
* remaining_data_length: remaining data to send in this payload |
|
*/ |
|
static int smbd_post_send_page(struct smbd_connection *info, struct page *page, |
|
unsigned long offset, size_t size, int remaining_data_length) |
|
{ |
|
struct scatterlist sgl; |
|
|
|
sg_init_table(&sgl, 1); |
|
sg_set_page(&sgl, page, size, offset); |
|
|
|
return smbd_post_send_sgl(info, &sgl, size, remaining_data_length); |
|
} |
|
|
|
/* |
|
* Send an empty message |
|
* Empty message is used to extend credits to peer to for keep live |
|
* while there is no upper layer payload to send at the time |
|
*/ |
|
static int smbd_post_send_empty(struct smbd_connection *info) |
|
{ |
|
info->count_send_empty++; |
|
return smbd_post_send_sgl(info, NULL, 0, 0); |
|
} |
|
|
|
/* |
|
* Send a data buffer |
|
* iov: the iov array describing the data buffers |
|
* n_vec: number of iov array |
|
* remaining_data_length: remaining data to send following this packet |
|
* in segmented SMBD packet |
|
*/ |
|
static int smbd_post_send_data( |
|
struct smbd_connection *info, struct kvec *iov, int n_vec, |
|
int remaining_data_length) |
|
{ |
|
int i; |
|
u32 data_length = 0; |
|
struct scatterlist sgl[SMBDIRECT_MAX_SGE]; |
|
|
|
if (n_vec > SMBDIRECT_MAX_SGE) { |
|
cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec); |
|
return -EINVAL; |
|
} |
|
|
|
sg_init_table(sgl, n_vec); |
|
for (i = 0; i < n_vec; i++) { |
|
data_length += iov[i].iov_len; |
|
sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len); |
|
} |
|
|
|
return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length); |
|
} |
|
|
|
/* |
|
* Post a receive request to the transport |
|
* The remote peer can only send data when a receive request is posted |
|
* The interaction is controlled by send/receive credit system |
|
*/ |
|
static int smbd_post_recv( |
|
struct smbd_connection *info, struct smbd_response *response) |
|
{ |
|
struct ib_recv_wr recv_wr; |
|
int rc = -EIO; |
|
|
|
response->sge.addr = ib_dma_map_single( |
|
info->id->device, response->packet, |
|
info->max_receive_size, DMA_FROM_DEVICE); |
|
if (ib_dma_mapping_error(info->id->device, response->sge.addr)) |
|
return rc; |
|
|
|
response->sge.length = info->max_receive_size; |
|
response->sge.lkey = info->pd->local_dma_lkey; |
|
|
|
response->cqe.done = recv_done; |
|
|
|
recv_wr.wr_cqe = &response->cqe; |
|
recv_wr.next = NULL; |
|
recv_wr.sg_list = &response->sge; |
|
recv_wr.num_sge = 1; |
|
|
|
rc = ib_post_recv(info->id->qp, &recv_wr, NULL); |
|
if (rc) { |
|
ib_dma_unmap_single(info->id->device, response->sge.addr, |
|
response->sge.length, DMA_FROM_DEVICE); |
|
smbd_disconnect_rdma_connection(info); |
|
log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc); |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
/* Perform SMBD negotiate according to [MS-SMBD] 3.1.5.2 */ |
|
static int smbd_negotiate(struct smbd_connection *info) |
|
{ |
|
int rc; |
|
struct smbd_response *response = get_receive_buffer(info); |
|
|
|
response->type = SMBD_NEGOTIATE_RESP; |
|
rc = smbd_post_recv(info, response); |
|
log_rdma_event(INFO, "smbd_post_recv rc=%d iov.addr=%llx iov.length=%x iov.lkey=%x\n", |
|
rc, response->sge.addr, |
|
response->sge.length, response->sge.lkey); |
|
if (rc) |
|
return rc; |
|
|
|
init_completion(&info->negotiate_completion); |
|
info->negotiate_done = false; |
|
rc = smbd_post_send_negotiate_req(info); |
|
if (rc) |
|
return rc; |
|
|
|
rc = wait_for_completion_interruptible_timeout( |
|
&info->negotiate_completion, SMBD_NEGOTIATE_TIMEOUT * HZ); |
|
log_rdma_event(INFO, "wait_for_completion_timeout rc=%d\n", rc); |
|
|
|
if (info->negotiate_done) |
|
return 0; |
|
|
|
if (rc == 0) |
|
rc = -ETIMEDOUT; |
|
else if (rc == -ERESTARTSYS) |
|
rc = -EINTR; |
|
else |
|
rc = -ENOTCONN; |
|
|
|
return rc; |
|
} |
|
|
|
static void put_empty_packet( |
|
struct smbd_connection *info, struct smbd_response *response) |
|
{ |
|
spin_lock(&info->empty_packet_queue_lock); |
|
list_add_tail(&response->list, &info->empty_packet_queue); |
|
info->count_empty_packet_queue++; |
|
spin_unlock(&info->empty_packet_queue_lock); |
|
|
|
queue_work(info->workqueue, &info->post_send_credits_work); |
|
} |
|
|
|
/* |
|
* Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1 |
|
* This is a queue for reassembling upper layer payload and present to upper |
|
* layer. All the inncoming payload go to the reassembly queue, regardless of |
|
* if reassembly is required. The uuper layer code reads from the queue for all |
|
* incoming payloads. |
|
* Put a received packet to the reassembly queue |
|
* response: the packet received |
|
* data_length: the size of payload in this packet |
|
*/ |
|
static void enqueue_reassembly( |
|
struct smbd_connection *info, |
|
struct smbd_response *response, |
|
int data_length) |
|
{ |
|
spin_lock(&info->reassembly_queue_lock); |
|
list_add_tail(&response->list, &info->reassembly_queue); |
|
info->reassembly_queue_length++; |
|
/* |
|
* Make sure reassembly_data_length is updated after list and |
|
* reassembly_queue_length are updated. On the dequeue side |
|
* reassembly_data_length is checked without a lock to determine |
|
* if reassembly_queue_length and list is up to date |
|
*/ |
|
virt_wmb(); |
|
info->reassembly_data_length += data_length; |
|
spin_unlock(&info->reassembly_queue_lock); |
|
info->count_reassembly_queue++; |
|
info->count_enqueue_reassembly_queue++; |
|
} |
|
|
|
/* |
|
* Get the first entry at the front of reassembly queue |
|
* Caller is responsible for locking |
|
* return value: the first entry if any, NULL if queue is empty |
|
*/ |
|
static struct smbd_response *_get_first_reassembly(struct smbd_connection *info) |
|
{ |
|
struct smbd_response *ret = NULL; |
|
|
|
if (!list_empty(&info->reassembly_queue)) { |
|
ret = list_first_entry( |
|
&info->reassembly_queue, |
|
struct smbd_response, list); |
|
} |
|
return ret; |
|
} |
|
|
|
static struct smbd_response *get_empty_queue_buffer( |
|
struct smbd_connection *info) |
|
{ |
|
struct smbd_response *ret = NULL; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&info->empty_packet_queue_lock, flags); |
|
if (!list_empty(&info->empty_packet_queue)) { |
|
ret = list_first_entry( |
|
&info->empty_packet_queue, |
|
struct smbd_response, list); |
|
list_del(&ret->list); |
|
info->count_empty_packet_queue--; |
|
} |
|
spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Get a receive buffer |
|
* For each remote send, we need to post a receive. The receive buffers are |
|
* pre-allocated in advance. |
|
* return value: the receive buffer, NULL if none is available |
|
*/ |
|
static struct smbd_response *get_receive_buffer(struct smbd_connection *info) |
|
{ |
|
struct smbd_response *ret = NULL; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&info->receive_queue_lock, flags); |
|
if (!list_empty(&info->receive_queue)) { |
|
ret = list_first_entry( |
|
&info->receive_queue, |
|
struct smbd_response, list); |
|
list_del(&ret->list); |
|
info->count_receive_queue--; |
|
info->count_get_receive_buffer++; |
|
} |
|
spin_unlock_irqrestore(&info->receive_queue_lock, flags); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Return a receive buffer |
|
* Upon returning of a receive buffer, we can post new receive and extend |
|
* more receive credits to remote peer. This is done immediately after a |
|
* receive buffer is returned. |
|
*/ |
|
static void put_receive_buffer( |
|
struct smbd_connection *info, struct smbd_response *response) |
|
{ |
|
unsigned long flags; |
|
|
|
ib_dma_unmap_single(info->id->device, response->sge.addr, |
|
response->sge.length, DMA_FROM_DEVICE); |
|
|
|
spin_lock_irqsave(&info->receive_queue_lock, flags); |
|
list_add_tail(&response->list, &info->receive_queue); |
|
info->count_receive_queue++; |
|
info->count_put_receive_buffer++; |
|
spin_unlock_irqrestore(&info->receive_queue_lock, flags); |
|
|
|
queue_work(info->workqueue, &info->post_send_credits_work); |
|
} |
|
|
|
/* Preallocate all receive buffer on transport establishment */ |
|
static int allocate_receive_buffers(struct smbd_connection *info, int num_buf) |
|
{ |
|
int i; |
|
struct smbd_response *response; |
|
|
|
INIT_LIST_HEAD(&info->reassembly_queue); |
|
spin_lock_init(&info->reassembly_queue_lock); |
|
info->reassembly_data_length = 0; |
|
info->reassembly_queue_length = 0; |
|
|
|
INIT_LIST_HEAD(&info->receive_queue); |
|
spin_lock_init(&info->receive_queue_lock); |
|
info->count_receive_queue = 0; |
|
|
|
INIT_LIST_HEAD(&info->empty_packet_queue); |
|
spin_lock_init(&info->empty_packet_queue_lock); |
|
info->count_empty_packet_queue = 0; |
|
|
|
init_waitqueue_head(&info->wait_receive_queues); |
|
|
|
for (i = 0; i < num_buf; i++) { |
|
response = mempool_alloc(info->response_mempool, GFP_KERNEL); |
|
if (!response) |
|
goto allocate_failed; |
|
|
|
response->info = info; |
|
list_add_tail(&response->list, &info->receive_queue); |
|
info->count_receive_queue++; |
|
} |
|
|
|
return 0; |
|
|
|
allocate_failed: |
|
while (!list_empty(&info->receive_queue)) { |
|
response = list_first_entry( |
|
&info->receive_queue, |
|
struct smbd_response, list); |
|
list_del(&response->list); |
|
info->count_receive_queue--; |
|
|
|
mempool_free(response, info->response_mempool); |
|
} |
|
return -ENOMEM; |
|
} |
|
|
|
static void destroy_receive_buffers(struct smbd_connection *info) |
|
{ |
|
struct smbd_response *response; |
|
|
|
while ((response = get_receive_buffer(info))) |
|
mempool_free(response, info->response_mempool); |
|
|
|
while ((response = get_empty_queue_buffer(info))) |
|
mempool_free(response, info->response_mempool); |
|
} |
|
|
|
/* Implement idle connection timer [MS-SMBD] 3.1.6.2 */ |
|
static void idle_connection_timer(struct work_struct *work) |
|
{ |
|
struct smbd_connection *info = container_of( |
|
work, struct smbd_connection, |
|
idle_timer_work.work); |
|
|
|
if (info->keep_alive_requested != KEEP_ALIVE_NONE) { |
|
log_keep_alive(ERR, |
|
"error status info->keep_alive_requested=%d\n", |
|
info->keep_alive_requested); |
|
smbd_disconnect_rdma_connection(info); |
|
return; |
|
} |
|
|
|
log_keep_alive(INFO, "about to send an empty idle message\n"); |
|
smbd_post_send_empty(info); |
|
|
|
/* Setup the next idle timeout work */ |
|
queue_delayed_work(info->workqueue, &info->idle_timer_work, |
|
info->keep_alive_interval*HZ); |
|
} |
|
|
|
/* |
|
* Destroy the transport and related RDMA and memory resources |
|
* Need to go through all the pending counters and make sure on one is using |
|
* the transport while it is destroyed |
|
*/ |
|
void smbd_destroy(struct TCP_Server_Info *server) |
|
{ |
|
struct smbd_connection *info = server->smbd_conn; |
|
struct smbd_response *response; |
|
unsigned long flags; |
|
|
|
if (!info) { |
|
log_rdma_event(INFO, "rdma session already destroyed\n"); |
|
return; |
|
} |
|
|
|
log_rdma_event(INFO, "destroying rdma session\n"); |
|
if (info->transport_status != SMBD_DISCONNECTED) { |
|
rdma_disconnect(server->smbd_conn->id); |
|
log_rdma_event(INFO, "wait for transport being disconnected\n"); |
|
wait_event_interruptible( |
|
info->disconn_wait, |
|
info->transport_status == SMBD_DISCONNECTED); |
|
} |
|
|
|
log_rdma_event(INFO, "destroying qp\n"); |
|
ib_drain_qp(info->id->qp); |
|
rdma_destroy_qp(info->id); |
|
|
|
log_rdma_event(INFO, "cancelling idle timer\n"); |
|
cancel_delayed_work_sync(&info->idle_timer_work); |
|
|
|
log_rdma_event(INFO, "wait for all send posted to IB to finish\n"); |
|
wait_event(info->wait_send_pending, |
|
atomic_read(&info->send_pending) == 0); |
|
|
|
/* It's not posssible for upper layer to get to reassembly */ |
|
log_rdma_event(INFO, "drain the reassembly queue\n"); |
|
do { |
|
spin_lock_irqsave(&info->reassembly_queue_lock, flags); |
|
response = _get_first_reassembly(info); |
|
if (response) { |
|
list_del(&response->list); |
|
spin_unlock_irqrestore( |
|
&info->reassembly_queue_lock, flags); |
|
put_receive_buffer(info, response); |
|
} else |
|
spin_unlock_irqrestore( |
|
&info->reassembly_queue_lock, flags); |
|
} while (response); |
|
info->reassembly_data_length = 0; |
|
|
|
log_rdma_event(INFO, "free receive buffers\n"); |
|
wait_event(info->wait_receive_queues, |
|
info->count_receive_queue + info->count_empty_packet_queue |
|
== info->receive_credit_max); |
|
destroy_receive_buffers(info); |
|
|
|
/* |
|
* For performance reasons, memory registration and deregistration |
|
* are not locked by srv_mutex. It is possible some processes are |
|
* blocked on transport srv_mutex while holding memory registration. |
|
* Release the transport srv_mutex to allow them to hit the failure |
|
* path when sending data, and then release memory registartions. |
|
*/ |
|
log_rdma_event(INFO, "freeing mr list\n"); |
|
wake_up_interruptible_all(&info->wait_mr); |
|
while (atomic_read(&info->mr_used_count)) { |
|
mutex_unlock(&server->srv_mutex); |
|
msleep(1000); |
|
mutex_lock(&server->srv_mutex); |
|
} |
|
destroy_mr_list(info); |
|
|
|
ib_free_cq(info->send_cq); |
|
ib_free_cq(info->recv_cq); |
|
ib_dealloc_pd(info->pd); |
|
rdma_destroy_id(info->id); |
|
|
|
/* free mempools */ |
|
mempool_destroy(info->request_mempool); |
|
kmem_cache_destroy(info->request_cache); |
|
|
|
mempool_destroy(info->response_mempool); |
|
kmem_cache_destroy(info->response_cache); |
|
|
|
info->transport_status = SMBD_DESTROYED; |
|
|
|
destroy_workqueue(info->workqueue); |
|
log_rdma_event(INFO, "rdma session destroyed\n"); |
|
kfree(info); |
|
} |
|
|
|
/* |
|
* Reconnect this SMBD connection, called from upper layer |
|
* return value: 0 on success, or actual error code |
|
*/ |
|
int smbd_reconnect(struct TCP_Server_Info *server) |
|
{ |
|
log_rdma_event(INFO, "reconnecting rdma session\n"); |
|
|
|
if (!server->smbd_conn) { |
|
log_rdma_event(INFO, "rdma session already destroyed\n"); |
|
goto create_conn; |
|
} |
|
|
|
/* |
|
* This is possible if transport is disconnected and we haven't received |
|
* notification from RDMA, but upper layer has detected timeout |
|
*/ |
|
if (server->smbd_conn->transport_status == SMBD_CONNECTED) { |
|
log_rdma_event(INFO, "disconnecting transport\n"); |
|
smbd_destroy(server); |
|
} |
|
|
|
create_conn: |
|
log_rdma_event(INFO, "creating rdma session\n"); |
|
server->smbd_conn = smbd_get_connection( |
|
server, (struct sockaddr *) &server->dstaddr); |
|
|
|
if (server->smbd_conn) |
|
cifs_dbg(VFS, "RDMA transport re-established\n"); |
|
|
|
return server->smbd_conn ? 0 : -ENOENT; |
|
} |
|
|
|
static void destroy_caches_and_workqueue(struct smbd_connection *info) |
|
{ |
|
destroy_receive_buffers(info); |
|
destroy_workqueue(info->workqueue); |
|
mempool_destroy(info->response_mempool); |
|
kmem_cache_destroy(info->response_cache); |
|
mempool_destroy(info->request_mempool); |
|
kmem_cache_destroy(info->request_cache); |
|
} |
|
|
|
#define MAX_NAME_LEN 80 |
|
static int allocate_caches_and_workqueue(struct smbd_connection *info) |
|
{ |
|
char name[MAX_NAME_LEN]; |
|
int rc; |
|
|
|
scnprintf(name, MAX_NAME_LEN, "smbd_request_%p", info); |
|
info->request_cache = |
|
kmem_cache_create( |
|
name, |
|
sizeof(struct smbd_request) + |
|
sizeof(struct smbd_data_transfer), |
|
0, SLAB_HWCACHE_ALIGN, NULL); |
|
if (!info->request_cache) |
|
return -ENOMEM; |
|
|
|
info->request_mempool = |
|
mempool_create(info->send_credit_target, mempool_alloc_slab, |
|
mempool_free_slab, info->request_cache); |
|
if (!info->request_mempool) |
|
goto out1; |
|
|
|
scnprintf(name, MAX_NAME_LEN, "smbd_response_%p", info); |
|
info->response_cache = |
|
kmem_cache_create( |
|
name, |
|
sizeof(struct smbd_response) + |
|
info->max_receive_size, |
|
0, SLAB_HWCACHE_ALIGN, NULL); |
|
if (!info->response_cache) |
|
goto out2; |
|
|
|
info->response_mempool = |
|
mempool_create(info->receive_credit_max, mempool_alloc_slab, |
|
mempool_free_slab, info->response_cache); |
|
if (!info->response_mempool) |
|
goto out3; |
|
|
|
scnprintf(name, MAX_NAME_LEN, "smbd_%p", info); |
|
info->workqueue = create_workqueue(name); |
|
if (!info->workqueue) |
|
goto out4; |
|
|
|
rc = allocate_receive_buffers(info, info->receive_credit_max); |
|
if (rc) { |
|
log_rdma_event(ERR, "failed to allocate receive buffers\n"); |
|
goto out5; |
|
} |
|
|
|
return 0; |
|
|
|
out5: |
|
destroy_workqueue(info->workqueue); |
|
out4: |
|
mempool_destroy(info->response_mempool); |
|
out3: |
|
kmem_cache_destroy(info->response_cache); |
|
out2: |
|
mempool_destroy(info->request_mempool); |
|
out1: |
|
kmem_cache_destroy(info->request_cache); |
|
return -ENOMEM; |
|
} |
|
|
|
/* Create a SMBD connection, called by upper layer */ |
|
static struct smbd_connection *_smbd_get_connection( |
|
struct TCP_Server_Info *server, struct sockaddr *dstaddr, int port) |
|
{ |
|
int rc; |
|
struct smbd_connection *info; |
|
struct rdma_conn_param conn_param; |
|
struct ib_qp_init_attr qp_attr; |
|
struct sockaddr_in *addr_in = (struct sockaddr_in *) dstaddr; |
|
struct ib_port_immutable port_immutable; |
|
u32 ird_ord_hdr[2]; |
|
|
|
info = kzalloc(sizeof(struct smbd_connection), GFP_KERNEL); |
|
if (!info) |
|
return NULL; |
|
|
|
info->transport_status = SMBD_CONNECTING; |
|
rc = smbd_ia_open(info, dstaddr, port); |
|
if (rc) { |
|
log_rdma_event(INFO, "smbd_ia_open rc=%d\n", rc); |
|
goto create_id_failed; |
|
} |
|
|
|
if (smbd_send_credit_target > info->id->device->attrs.max_cqe || |
|
smbd_send_credit_target > info->id->device->attrs.max_qp_wr) { |
|
log_rdma_event(ERR, "consider lowering send_credit_target = %d. Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n", |
|
smbd_send_credit_target, |
|
info->id->device->attrs.max_cqe, |
|
info->id->device->attrs.max_qp_wr); |
|
goto config_failed; |
|
} |
|
|
|
if (smbd_receive_credit_max > info->id->device->attrs.max_cqe || |
|
smbd_receive_credit_max > info->id->device->attrs.max_qp_wr) { |
|
log_rdma_event(ERR, "consider lowering receive_credit_max = %d. Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n", |
|
smbd_receive_credit_max, |
|
info->id->device->attrs.max_cqe, |
|
info->id->device->attrs.max_qp_wr); |
|
goto config_failed; |
|
} |
|
|
|
info->receive_credit_max = smbd_receive_credit_max; |
|
info->send_credit_target = smbd_send_credit_target; |
|
info->max_send_size = smbd_max_send_size; |
|
info->max_fragmented_recv_size = smbd_max_fragmented_recv_size; |
|
info->max_receive_size = smbd_max_receive_size; |
|
info->keep_alive_interval = smbd_keep_alive_interval; |
|
|
|
if (info->id->device->attrs.max_send_sge < SMBDIRECT_MAX_SGE) { |
|
log_rdma_event(ERR, |
|
"warning: device max_send_sge = %d too small\n", |
|
info->id->device->attrs.max_send_sge); |
|
log_rdma_event(ERR, "Queue Pair creation may fail\n"); |
|
} |
|
if (info->id->device->attrs.max_recv_sge < SMBDIRECT_MAX_SGE) { |
|
log_rdma_event(ERR, |
|
"warning: device max_recv_sge = %d too small\n", |
|
info->id->device->attrs.max_recv_sge); |
|
log_rdma_event(ERR, "Queue Pair creation may fail\n"); |
|
} |
|
|
|
info->send_cq = NULL; |
|
info->recv_cq = NULL; |
|
info->send_cq = |
|
ib_alloc_cq_any(info->id->device, info, |
|
info->send_credit_target, IB_POLL_SOFTIRQ); |
|
if (IS_ERR(info->send_cq)) { |
|
info->send_cq = NULL; |
|
goto alloc_cq_failed; |
|
} |
|
|
|
info->recv_cq = |
|
ib_alloc_cq_any(info->id->device, info, |
|
info->receive_credit_max, IB_POLL_SOFTIRQ); |
|
if (IS_ERR(info->recv_cq)) { |
|
info->recv_cq = NULL; |
|
goto alloc_cq_failed; |
|
} |
|
|
|
memset(&qp_attr, 0, sizeof(qp_attr)); |
|
qp_attr.event_handler = smbd_qp_async_error_upcall; |
|
qp_attr.qp_context = info; |
|
qp_attr.cap.max_send_wr = info->send_credit_target; |
|
qp_attr.cap.max_recv_wr = info->receive_credit_max; |
|
qp_attr.cap.max_send_sge = SMBDIRECT_MAX_SGE; |
|
qp_attr.cap.max_recv_sge = SMBDIRECT_MAX_SGE; |
|
qp_attr.cap.max_inline_data = 0; |
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
|
qp_attr.qp_type = IB_QPT_RC; |
|
qp_attr.send_cq = info->send_cq; |
|
qp_attr.recv_cq = info->recv_cq; |
|
qp_attr.port_num = ~0; |
|
|
|
rc = rdma_create_qp(info->id, info->pd, &qp_attr); |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_create_qp failed %i\n", rc); |
|
goto create_qp_failed; |
|
} |
|
|
|
memset(&conn_param, 0, sizeof(conn_param)); |
|
conn_param.initiator_depth = 0; |
|
|
|
conn_param.responder_resources = |
|
info->id->device->attrs.max_qp_rd_atom |
|
< SMBD_CM_RESPONDER_RESOURCES ? |
|
info->id->device->attrs.max_qp_rd_atom : |
|
SMBD_CM_RESPONDER_RESOURCES; |
|
info->responder_resources = conn_param.responder_resources; |
|
log_rdma_mr(INFO, "responder_resources=%d\n", |
|
info->responder_resources); |
|
|
|
/* Need to send IRD/ORD in private data for iWARP */ |
|
info->id->device->ops.get_port_immutable( |
|
info->id->device, info->id->port_num, &port_immutable); |
|
if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { |
|
ird_ord_hdr[0] = info->responder_resources; |
|
ird_ord_hdr[1] = 1; |
|
conn_param.private_data = ird_ord_hdr; |
|
conn_param.private_data_len = sizeof(ird_ord_hdr); |
|
} else { |
|
conn_param.private_data = NULL; |
|
conn_param.private_data_len = 0; |
|
} |
|
|
|
conn_param.retry_count = SMBD_CM_RETRY; |
|
conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY; |
|
conn_param.flow_control = 0; |
|
|
|
log_rdma_event(INFO, "connecting to IP %pI4 port %d\n", |
|
&addr_in->sin_addr, port); |
|
|
|
init_waitqueue_head(&info->conn_wait); |
|
init_waitqueue_head(&info->disconn_wait); |
|
init_waitqueue_head(&info->wait_reassembly_queue); |
|
rc = rdma_connect(info->id, &conn_param); |
|
if (rc) { |
|
log_rdma_event(ERR, "rdma_connect() failed with %i\n", rc); |
|
goto rdma_connect_failed; |
|
} |
|
|
|
wait_event_interruptible( |
|
info->conn_wait, info->transport_status != SMBD_CONNECTING); |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
log_rdma_event(ERR, "rdma_connect failed port=%d\n", port); |
|
goto rdma_connect_failed; |
|
} |
|
|
|
log_rdma_event(INFO, "rdma_connect connected\n"); |
|
|
|
rc = allocate_caches_and_workqueue(info); |
|
if (rc) { |
|
log_rdma_event(ERR, "cache allocation failed\n"); |
|
goto allocate_cache_failed; |
|
} |
|
|
|
init_waitqueue_head(&info->wait_send_queue); |
|
INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer); |
|
queue_delayed_work(info->workqueue, &info->idle_timer_work, |
|
info->keep_alive_interval*HZ); |
|
|
|
init_waitqueue_head(&info->wait_send_pending); |
|
atomic_set(&info->send_pending, 0); |
|
|
|
init_waitqueue_head(&info->wait_post_send); |
|
|
|
INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work); |
|
INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits); |
|
info->new_credits_offered = 0; |
|
spin_lock_init(&info->lock_new_credits_offered); |
|
|
|
rc = smbd_negotiate(info); |
|
if (rc) { |
|
log_rdma_event(ERR, "smbd_negotiate rc=%d\n", rc); |
|
goto negotiation_failed; |
|
} |
|
|
|
rc = allocate_mr_list(info); |
|
if (rc) { |
|
log_rdma_mr(ERR, "memory registration allocation failed\n"); |
|
goto allocate_mr_failed; |
|
} |
|
|
|
return info; |
|
|
|
allocate_mr_failed: |
|
/* At this point, need to a full transport shutdown */ |
|
smbd_destroy(server); |
|
return NULL; |
|
|
|
negotiation_failed: |
|
cancel_delayed_work_sync(&info->idle_timer_work); |
|
destroy_caches_and_workqueue(info); |
|
info->transport_status = SMBD_NEGOTIATE_FAILED; |
|
init_waitqueue_head(&info->conn_wait); |
|
rdma_disconnect(info->id); |
|
wait_event(info->conn_wait, |
|
info->transport_status == SMBD_DISCONNECTED); |
|
|
|
allocate_cache_failed: |
|
rdma_connect_failed: |
|
rdma_destroy_qp(info->id); |
|
|
|
create_qp_failed: |
|
alloc_cq_failed: |
|
if (info->send_cq) |
|
ib_free_cq(info->send_cq); |
|
if (info->recv_cq) |
|
ib_free_cq(info->recv_cq); |
|
|
|
config_failed: |
|
ib_dealloc_pd(info->pd); |
|
rdma_destroy_id(info->id); |
|
|
|
create_id_failed: |
|
kfree(info); |
|
return NULL; |
|
} |
|
|
|
struct smbd_connection *smbd_get_connection( |
|
struct TCP_Server_Info *server, struct sockaddr *dstaddr) |
|
{ |
|
struct smbd_connection *ret; |
|
int port = SMBD_PORT; |
|
|
|
try_again: |
|
ret = _smbd_get_connection(server, dstaddr, port); |
|
|
|
/* Try SMB_PORT if SMBD_PORT doesn't work */ |
|
if (!ret && port == SMBD_PORT) { |
|
port = SMB_PORT; |
|
goto try_again; |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* Receive data from receive reassembly queue |
|
* All the incoming data packets are placed in reassembly queue |
|
* buf: the buffer to read data into |
|
* size: the length of data to read |
|
* return value: actual data read |
|
* Note: this implementation copies the data from reassebmly queue to receive |
|
* buffers used by upper layer. This is not the optimal code path. A better way |
|
* to do it is to not have upper layer allocate its receive buffers but rather |
|
* borrow the buffer from reassembly queue, and return it after data is |
|
* consumed. But this will require more changes to upper layer code, and also |
|
* need to consider packet boundaries while they still being reassembled. |
|
*/ |
|
static int smbd_recv_buf(struct smbd_connection *info, char *buf, |
|
unsigned int size) |
|
{ |
|
struct smbd_response *response; |
|
struct smbd_data_transfer *data_transfer; |
|
int to_copy, to_read, data_read, offset; |
|
u32 data_length, remaining_data_length, data_offset; |
|
int rc; |
|
|
|
again: |
|
/* |
|
* No need to hold the reassembly queue lock all the time as we are |
|
* the only one reading from the front of the queue. The transport |
|
* may add more entries to the back of the queue at the same time |
|
*/ |
|
log_read(INFO, "size=%d info->reassembly_data_length=%d\n", size, |
|
info->reassembly_data_length); |
|
if (info->reassembly_data_length >= size) { |
|
int queue_length; |
|
int queue_removed = 0; |
|
|
|
/* |
|
* Need to make sure reassembly_data_length is read before |
|
* reading reassembly_queue_length and calling |
|
* _get_first_reassembly. This call is lock free |
|
* as we never read at the end of the queue which are being |
|
* updated in SOFTIRQ as more data is received |
|
*/ |
|
virt_rmb(); |
|
queue_length = info->reassembly_queue_length; |
|
data_read = 0; |
|
to_read = size; |
|
offset = info->first_entry_offset; |
|
while (data_read < size) { |
|
response = _get_first_reassembly(info); |
|
data_transfer = smbd_response_payload(response); |
|
data_length = le32_to_cpu(data_transfer->data_length); |
|
remaining_data_length = |
|
le32_to_cpu( |
|
data_transfer->remaining_data_length); |
|
data_offset = le32_to_cpu(data_transfer->data_offset); |
|
|
|
/* |
|
* The upper layer expects RFC1002 length at the |
|
* beginning of the payload. Return it to indicate |
|
* the total length of the packet. This minimize the |
|
* change to upper layer packet processing logic. This |
|
* will be eventually remove when an intermediate |
|
* transport layer is added |
|
*/ |
|
if (response->first_segment && size == 4) { |
|
unsigned int rfc1002_len = |
|
data_length + remaining_data_length; |
|
*((__be32 *)buf) = cpu_to_be32(rfc1002_len); |
|
data_read = 4; |
|
response->first_segment = false; |
|
log_read(INFO, "returning rfc1002 length %d\n", |
|
rfc1002_len); |
|
goto read_rfc1002_done; |
|
} |
|
|
|
to_copy = min_t(int, data_length - offset, to_read); |
|
memcpy( |
|
buf + data_read, |
|
(char *)data_transfer + data_offset + offset, |
|
to_copy); |
|
|
|
/* move on to the next buffer? */ |
|
if (to_copy == data_length - offset) { |
|
queue_length--; |
|
/* |
|
* No need to lock if we are not at the |
|
* end of the queue |
|
*/ |
|
if (queue_length) |
|
list_del(&response->list); |
|
else { |
|
spin_lock_irq( |
|
&info->reassembly_queue_lock); |
|
list_del(&response->list); |
|
spin_unlock_irq( |
|
&info->reassembly_queue_lock); |
|
} |
|
queue_removed++; |
|
info->count_reassembly_queue--; |
|
info->count_dequeue_reassembly_queue++; |
|
put_receive_buffer(info, response); |
|
offset = 0; |
|
log_read(INFO, "put_receive_buffer offset=0\n"); |
|
} else |
|
offset += to_copy; |
|
|
|
to_read -= to_copy; |
|
data_read += to_copy; |
|
|
|
log_read(INFO, "_get_first_reassembly memcpy %d bytes data_transfer_length-offset=%d after that to_read=%d data_read=%d offset=%d\n", |
|
to_copy, data_length - offset, |
|
to_read, data_read, offset); |
|
} |
|
|
|
spin_lock_irq(&info->reassembly_queue_lock); |
|
info->reassembly_data_length -= data_read; |
|
info->reassembly_queue_length -= queue_removed; |
|
spin_unlock_irq(&info->reassembly_queue_lock); |
|
|
|
info->first_entry_offset = offset; |
|
log_read(INFO, "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n", |
|
data_read, info->reassembly_data_length, |
|
info->first_entry_offset); |
|
read_rfc1002_done: |
|
return data_read; |
|
} |
|
|
|
log_read(INFO, "wait_event on more data\n"); |
|
rc = wait_event_interruptible( |
|
info->wait_reassembly_queue, |
|
info->reassembly_data_length >= size || |
|
info->transport_status != SMBD_CONNECTED); |
|
/* Don't return any data if interrupted */ |
|
if (rc) |
|
return rc; |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
log_read(ERR, "disconnected\n"); |
|
return -ECONNABORTED; |
|
} |
|
|
|
goto again; |
|
} |
|
|
|
/* |
|
* Receive a page from receive reassembly queue |
|
* page: the page to read data into |
|
* to_read: the length of data to read |
|
* return value: actual data read |
|
*/ |
|
static int smbd_recv_page(struct smbd_connection *info, |
|
struct page *page, unsigned int page_offset, |
|
unsigned int to_read) |
|
{ |
|
int ret; |
|
char *to_address; |
|
void *page_address; |
|
|
|
/* make sure we have the page ready for read */ |
|
ret = wait_event_interruptible( |
|
info->wait_reassembly_queue, |
|
info->reassembly_data_length >= to_read || |
|
info->transport_status != SMBD_CONNECTED); |
|
if (ret) |
|
return ret; |
|
|
|
/* now we can read from reassembly queue and not sleep */ |
|
page_address = kmap_atomic(page); |
|
to_address = (char *) page_address + page_offset; |
|
|
|
log_read(INFO, "reading from page=%p address=%p to_read=%d\n", |
|
page, to_address, to_read); |
|
|
|
ret = smbd_recv_buf(info, to_address, to_read); |
|
kunmap_atomic(page_address); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Receive data from transport |
|
* msg: a msghdr point to the buffer, can be ITER_KVEC or ITER_BVEC |
|
* return: total bytes read, or 0. SMB Direct will not do partial read. |
|
*/ |
|
int smbd_recv(struct smbd_connection *info, struct msghdr *msg) |
|
{ |
|
char *buf; |
|
struct page *page; |
|
unsigned int to_read, page_offset; |
|
int rc; |
|
|
|
if (iov_iter_rw(&msg->msg_iter) == WRITE) { |
|
/* It's a bug in upper layer to get there */ |
|
cifs_dbg(VFS, "Invalid msg iter dir %u\n", |
|
iov_iter_rw(&msg->msg_iter)); |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
|
|
switch (iov_iter_type(&msg->msg_iter)) { |
|
case ITER_KVEC: |
|
buf = msg->msg_iter.kvec->iov_base; |
|
to_read = msg->msg_iter.kvec->iov_len; |
|
rc = smbd_recv_buf(info, buf, to_read); |
|
break; |
|
|
|
case ITER_BVEC: |
|
page = msg->msg_iter.bvec->bv_page; |
|
page_offset = msg->msg_iter.bvec->bv_offset; |
|
to_read = msg->msg_iter.bvec->bv_len; |
|
rc = smbd_recv_page(info, page, page_offset, to_read); |
|
break; |
|
|
|
default: |
|
/* It's a bug in upper layer to get there */ |
|
cifs_dbg(VFS, "Invalid msg type %d\n", |
|
iov_iter_type(&msg->msg_iter)); |
|
rc = -EINVAL; |
|
} |
|
|
|
out: |
|
/* SMBDirect will read it all or nothing */ |
|
if (rc > 0) |
|
msg->msg_iter.count = 0; |
|
return rc; |
|
} |
|
|
|
/* |
|
* Send data to transport |
|
* Each rqst is transported as a SMBDirect payload |
|
* rqst: the data to write |
|
* return value: 0 if successfully write, otherwise error code |
|
*/ |
|
int smbd_send(struct TCP_Server_Info *server, |
|
int num_rqst, struct smb_rqst *rqst_array) |
|
{ |
|
struct smbd_connection *info = server->smbd_conn; |
|
struct kvec vec; |
|
int nvecs; |
|
int size; |
|
unsigned int buflen, remaining_data_length; |
|
int start, i, j; |
|
int max_iov_size = |
|
info->max_send_size - sizeof(struct smbd_data_transfer); |
|
struct kvec *iov; |
|
int rc; |
|
struct smb_rqst *rqst; |
|
int rqst_idx; |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
rc = -EAGAIN; |
|
goto done; |
|
} |
|
|
|
/* |
|
* Add in the page array if there is one. The caller needs to set |
|
* rq_tailsz to PAGE_SIZE when the buffer has multiple pages and |
|
* ends at page boundary |
|
*/ |
|
remaining_data_length = 0; |
|
for (i = 0; i < num_rqst; i++) |
|
remaining_data_length += smb_rqst_len(server, &rqst_array[i]); |
|
|
|
if (remaining_data_length > info->max_fragmented_send_size) { |
|
log_write(ERR, "payload size %d > max size %d\n", |
|
remaining_data_length, info->max_fragmented_send_size); |
|
rc = -EINVAL; |
|
goto done; |
|
} |
|
|
|
log_write(INFO, "num_rqst=%d total length=%u\n", |
|
num_rqst, remaining_data_length); |
|
|
|
rqst_idx = 0; |
|
next_rqst: |
|
rqst = &rqst_array[rqst_idx]; |
|
iov = rqst->rq_iov; |
|
|
|
cifs_dbg(FYI, "Sending smb (RDMA): idx=%d smb_len=%lu\n", |
|
rqst_idx, smb_rqst_len(server, rqst)); |
|
for (i = 0; i < rqst->rq_nvec; i++) |
|
dump_smb(iov[i].iov_base, iov[i].iov_len); |
|
|
|
|
|
log_write(INFO, "rqst_idx=%d nvec=%d rqst->rq_npages=%d rq_pagesz=%d rq_tailsz=%d buflen=%lu\n", |
|
rqst_idx, rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz, |
|
rqst->rq_tailsz, smb_rqst_len(server, rqst)); |
|
|
|
start = i = 0; |
|
buflen = 0; |
|
while (true) { |
|
buflen += iov[i].iov_len; |
|
if (buflen > max_iov_size) { |
|
if (i > start) { |
|
remaining_data_length -= |
|
(buflen-iov[i].iov_len); |
|
log_write(INFO, "sending iov[] from start=%d i=%d nvecs=%d remaining_data_length=%d\n", |
|
start, i, i - start, |
|
remaining_data_length); |
|
rc = smbd_post_send_data( |
|
info, &iov[start], i-start, |
|
remaining_data_length); |
|
if (rc) |
|
goto done; |
|
} else { |
|
/* iov[start] is too big, break it */ |
|
nvecs = (buflen+max_iov_size-1)/max_iov_size; |
|
log_write(INFO, "iov[%d] iov_base=%p buflen=%d break to %d vectors\n", |
|
start, iov[start].iov_base, |
|
buflen, nvecs); |
|
for (j = 0; j < nvecs; j++) { |
|
vec.iov_base = |
|
(char *)iov[start].iov_base + |
|
j*max_iov_size; |
|
vec.iov_len = max_iov_size; |
|
if (j == nvecs-1) |
|
vec.iov_len = |
|
buflen - |
|
max_iov_size*(nvecs-1); |
|
remaining_data_length -= vec.iov_len; |
|
log_write(INFO, |
|
"sending vec j=%d iov_base=%p iov_len=%zu remaining_data_length=%d\n", |
|
j, vec.iov_base, vec.iov_len, |
|
remaining_data_length); |
|
rc = smbd_post_send_data( |
|
info, &vec, 1, |
|
remaining_data_length); |
|
if (rc) |
|
goto done; |
|
} |
|
i++; |
|
if (i == rqst->rq_nvec) |
|
break; |
|
} |
|
start = i; |
|
buflen = 0; |
|
} else { |
|
i++; |
|
if (i == rqst->rq_nvec) { |
|
/* send out all remaining vecs */ |
|
remaining_data_length -= buflen; |
|
log_write(INFO, "sending iov[] from start=%d i=%d nvecs=%d remaining_data_length=%d\n", |
|
start, i, i - start, |
|
remaining_data_length); |
|
rc = smbd_post_send_data(info, &iov[start], |
|
i-start, remaining_data_length); |
|
if (rc) |
|
goto done; |
|
break; |
|
} |
|
} |
|
log_write(INFO, "looping i=%d buflen=%d\n", i, buflen); |
|
} |
|
|
|
/* now sending pages if there are any */ |
|
for (i = 0; i < rqst->rq_npages; i++) { |
|
unsigned int offset; |
|
|
|
rqst_page_get_length(rqst, i, &buflen, &offset); |
|
nvecs = (buflen + max_iov_size - 1) / max_iov_size; |
|
log_write(INFO, "sending pages buflen=%d nvecs=%d\n", |
|
buflen, nvecs); |
|
for (j = 0; j < nvecs; j++) { |
|
size = max_iov_size; |
|
if (j == nvecs-1) |
|
size = buflen - j*max_iov_size; |
|
remaining_data_length -= size; |
|
log_write(INFO, "sending pages i=%d offset=%d size=%d remaining_data_length=%d\n", |
|
i, j * max_iov_size + offset, size, |
|
remaining_data_length); |
|
rc = smbd_post_send_page( |
|
info, rqst->rq_pages[i], |
|
j*max_iov_size + offset, |
|
size, remaining_data_length); |
|
if (rc) |
|
goto done; |
|
} |
|
} |
|
|
|
rqst_idx++; |
|
if (rqst_idx < num_rqst) |
|
goto next_rqst; |
|
|
|
done: |
|
/* |
|
* As an optimization, we don't wait for individual I/O to finish |
|
* before sending the next one. |
|
* Send them all and wait for pending send count to get to 0 |
|
* that means all the I/Os have been out and we are good to return |
|
*/ |
|
|
|
wait_event(info->wait_send_pending, |
|
atomic_read(&info->send_pending) == 0); |
|
|
|
return rc; |
|
} |
|
|
|
static void register_mr_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct smbd_mr *mr; |
|
struct ib_cqe *cqe; |
|
|
|
if (wc->status) { |
|
log_rdma_mr(ERR, "status=%d\n", wc->status); |
|
cqe = wc->wr_cqe; |
|
mr = container_of(cqe, struct smbd_mr, cqe); |
|
smbd_disconnect_rdma_connection(mr->conn); |
|
} |
|
} |
|
|
|
/* |
|
* The work queue function that recovers MRs |
|
* We need to call ib_dereg_mr() and ib_alloc_mr() before this MR can be used |
|
* again. Both calls are slow, so finish them in a workqueue. This will not |
|
* block I/O path. |
|
* There is one workqueue that recovers MRs, there is no need to lock as the |
|
* I/O requests calling smbd_register_mr will never update the links in the |
|
* mr_list. |
|
*/ |
|
static void smbd_mr_recovery_work(struct work_struct *work) |
|
{ |
|
struct smbd_connection *info = |
|
container_of(work, struct smbd_connection, mr_recovery_work); |
|
struct smbd_mr *smbdirect_mr; |
|
int rc; |
|
|
|
list_for_each_entry(smbdirect_mr, &info->mr_list, list) { |
|
if (smbdirect_mr->state == MR_ERROR) { |
|
|
|
/* recover this MR entry */ |
|
rc = ib_dereg_mr(smbdirect_mr->mr); |
|
if (rc) { |
|
log_rdma_mr(ERR, |
|
"ib_dereg_mr failed rc=%x\n", |
|
rc); |
|
smbd_disconnect_rdma_connection(info); |
|
continue; |
|
} |
|
|
|
smbdirect_mr->mr = ib_alloc_mr( |
|
info->pd, info->mr_type, |
|
info->max_frmr_depth); |
|
if (IS_ERR(smbdirect_mr->mr)) { |
|
log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x max_frmr_depth=%x\n", |
|
info->mr_type, |
|
info->max_frmr_depth); |
|
smbd_disconnect_rdma_connection(info); |
|
continue; |
|
} |
|
} else |
|
/* This MR is being used, don't recover it */ |
|
continue; |
|
|
|
smbdirect_mr->state = MR_READY; |
|
|
|
/* smbdirect_mr->state is updated by this function |
|
* and is read and updated by I/O issuing CPUs trying |
|
* to get a MR, the call to atomic_inc_return |
|
* implicates a memory barrier and guarantees this |
|
* value is updated before waking up any calls to |
|
* get_mr() from the I/O issuing CPUs |
|
*/ |
|
if (atomic_inc_return(&info->mr_ready_count) == 1) |
|
wake_up_interruptible(&info->wait_mr); |
|
} |
|
} |
|
|
|
static void destroy_mr_list(struct smbd_connection *info) |
|
{ |
|
struct smbd_mr *mr, *tmp; |
|
|
|
cancel_work_sync(&info->mr_recovery_work); |
|
list_for_each_entry_safe(mr, tmp, &info->mr_list, list) { |
|
if (mr->state == MR_INVALIDATED) |
|
ib_dma_unmap_sg(info->id->device, mr->sgl, |
|
mr->sgl_count, mr->dir); |
|
ib_dereg_mr(mr->mr); |
|
kfree(mr->sgl); |
|
kfree(mr); |
|
} |
|
} |
|
|
|
/* |
|
* Allocate MRs used for RDMA read/write |
|
* The number of MRs will not exceed hardware capability in responder_resources |
|
* All MRs are kept in mr_list. The MR can be recovered after it's used |
|
* Recovery is done in smbd_mr_recovery_work. The content of list entry changes |
|
* as MRs are used and recovered for I/O, but the list links will not change |
|
*/ |
|
static int allocate_mr_list(struct smbd_connection *info) |
|
{ |
|
int i; |
|
struct smbd_mr *smbdirect_mr, *tmp; |
|
|
|
INIT_LIST_HEAD(&info->mr_list); |
|
init_waitqueue_head(&info->wait_mr); |
|
spin_lock_init(&info->mr_list_lock); |
|
atomic_set(&info->mr_ready_count, 0); |
|
atomic_set(&info->mr_used_count, 0); |
|
init_waitqueue_head(&info->wait_for_mr_cleanup); |
|
/* Allocate more MRs (2x) than hardware responder_resources */ |
|
for (i = 0; i < info->responder_resources * 2; i++) { |
|
smbdirect_mr = kzalloc(sizeof(*smbdirect_mr), GFP_KERNEL); |
|
if (!smbdirect_mr) |
|
goto out; |
|
smbdirect_mr->mr = ib_alloc_mr(info->pd, info->mr_type, |
|
info->max_frmr_depth); |
|
if (IS_ERR(smbdirect_mr->mr)) { |
|
log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x max_frmr_depth=%x\n", |
|
info->mr_type, info->max_frmr_depth); |
|
goto out; |
|
} |
|
smbdirect_mr->sgl = kcalloc( |
|
info->max_frmr_depth, |
|
sizeof(struct scatterlist), |
|
GFP_KERNEL); |
|
if (!smbdirect_mr->sgl) { |
|
log_rdma_mr(ERR, "failed to allocate sgl\n"); |
|
ib_dereg_mr(smbdirect_mr->mr); |
|
goto out; |
|
} |
|
smbdirect_mr->state = MR_READY; |
|
smbdirect_mr->conn = info; |
|
|
|
list_add_tail(&smbdirect_mr->list, &info->mr_list); |
|
atomic_inc(&info->mr_ready_count); |
|
} |
|
INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work); |
|
return 0; |
|
|
|
out: |
|
kfree(smbdirect_mr); |
|
|
|
list_for_each_entry_safe(smbdirect_mr, tmp, &info->mr_list, list) { |
|
ib_dereg_mr(smbdirect_mr->mr); |
|
kfree(smbdirect_mr->sgl); |
|
kfree(smbdirect_mr); |
|
} |
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* Get a MR from mr_list. This function waits until there is at least one |
|
* MR available in the list. It may access the list while the |
|
* smbd_mr_recovery_work is recovering the MR list. This doesn't need a lock |
|
* as they never modify the same places. However, there may be several CPUs |
|
* issueing I/O trying to get MR at the same time, mr_list_lock is used to |
|
* protect this situation. |
|
*/ |
|
static struct smbd_mr *get_mr(struct smbd_connection *info) |
|
{ |
|
struct smbd_mr *ret; |
|
int rc; |
|
again: |
|
rc = wait_event_interruptible(info->wait_mr, |
|
atomic_read(&info->mr_ready_count) || |
|
info->transport_status != SMBD_CONNECTED); |
|
if (rc) { |
|
log_rdma_mr(ERR, "wait_event_interruptible rc=%x\n", rc); |
|
return NULL; |
|
} |
|
|
|
if (info->transport_status != SMBD_CONNECTED) { |
|
log_rdma_mr(ERR, "info->transport_status=%x\n", |
|
info->transport_status); |
|
return NULL; |
|
} |
|
|
|
spin_lock(&info->mr_list_lock); |
|
list_for_each_entry(ret, &info->mr_list, list) { |
|
if (ret->state == MR_READY) { |
|
ret->state = MR_REGISTERED; |
|
spin_unlock(&info->mr_list_lock); |
|
atomic_dec(&info->mr_ready_count); |
|
atomic_inc(&info->mr_used_count); |
|
return ret; |
|
} |
|
} |
|
|
|
spin_unlock(&info->mr_list_lock); |
|
/* |
|
* It is possible that we could fail to get MR because other processes may |
|
* try to acquire a MR at the same time. If this is the case, retry it. |
|
*/ |
|
goto again; |
|
} |
|
|
|
/* |
|
* Register memory for RDMA read/write |
|
* pages[]: the list of pages to register memory with |
|
* num_pages: the number of pages to register |
|
* tailsz: if non-zero, the bytes to register in the last page |
|
* writing: true if this is a RDMA write (SMB read), false for RDMA read |
|
* need_invalidate: true if this MR needs to be locally invalidated after I/O |
|
* return value: the MR registered, NULL if failed. |
|
*/ |
|
struct smbd_mr *smbd_register_mr( |
|
struct smbd_connection *info, struct page *pages[], int num_pages, |
|
int offset, int tailsz, bool writing, bool need_invalidate) |
|
{ |
|
struct smbd_mr *smbdirect_mr; |
|
int rc, i; |
|
enum dma_data_direction dir; |
|
struct ib_reg_wr *reg_wr; |
|
|
|
if (num_pages > info->max_frmr_depth) { |
|
log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n", |
|
num_pages, info->max_frmr_depth); |
|
return NULL; |
|
} |
|
|
|
smbdirect_mr = get_mr(info); |
|
if (!smbdirect_mr) { |
|
log_rdma_mr(ERR, "get_mr returning NULL\n"); |
|
return NULL; |
|
} |
|
smbdirect_mr->need_invalidate = need_invalidate; |
|
smbdirect_mr->sgl_count = num_pages; |
|
sg_init_table(smbdirect_mr->sgl, num_pages); |
|
|
|
log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n", |
|
num_pages, offset, tailsz); |
|
|
|
if (num_pages == 1) { |
|
sg_set_page(&smbdirect_mr->sgl[0], pages[0], tailsz, offset); |
|
goto skip_multiple_pages; |
|
} |
|
|
|
/* We have at least two pages to register */ |
|
sg_set_page( |
|
&smbdirect_mr->sgl[0], pages[0], PAGE_SIZE - offset, offset); |
|
i = 1; |
|
while (i < num_pages - 1) { |
|
sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0); |
|
i++; |
|
} |
|
sg_set_page(&smbdirect_mr->sgl[i], pages[i], |
|
tailsz ? tailsz : PAGE_SIZE, 0); |
|
|
|
skip_multiple_pages: |
|
dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; |
|
smbdirect_mr->dir = dir; |
|
rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir); |
|
if (!rc) { |
|
log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n", |
|
num_pages, dir, rc); |
|
goto dma_map_error; |
|
} |
|
|
|
rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages, |
|
NULL, PAGE_SIZE); |
|
if (rc != num_pages) { |
|
log_rdma_mr(ERR, |
|
"ib_map_mr_sg failed rc = %d num_pages = %x\n", |
|
rc, num_pages); |
|
goto map_mr_error; |
|
} |
|
|
|
ib_update_fast_reg_key(smbdirect_mr->mr, |
|
ib_inc_rkey(smbdirect_mr->mr->rkey)); |
|
reg_wr = &smbdirect_mr->wr; |
|
reg_wr->wr.opcode = IB_WR_REG_MR; |
|
smbdirect_mr->cqe.done = register_mr_done; |
|
reg_wr->wr.wr_cqe = &smbdirect_mr->cqe; |
|
reg_wr->wr.num_sge = 0; |
|
reg_wr->wr.send_flags = IB_SEND_SIGNALED; |
|
reg_wr->mr = smbdirect_mr->mr; |
|
reg_wr->key = smbdirect_mr->mr->rkey; |
|
reg_wr->access = writing ? |
|
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : |
|
IB_ACCESS_REMOTE_READ; |
|
|
|
/* |
|
* There is no need for waiting for complemtion on ib_post_send |
|
* on IB_WR_REG_MR. Hardware enforces a barrier and order of execution |
|
* on the next ib_post_send when we actaully send I/O to remote peer |
|
*/ |
|
rc = ib_post_send(info->id->qp, ®_wr->wr, NULL); |
|
if (!rc) |
|
return smbdirect_mr; |
|
|
|
log_rdma_mr(ERR, "ib_post_send failed rc=%x reg_wr->key=%x\n", |
|
rc, reg_wr->key); |
|
|
|
/* If all failed, attempt to recover this MR by setting it MR_ERROR*/ |
|
map_mr_error: |
|
ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl, |
|
smbdirect_mr->sgl_count, smbdirect_mr->dir); |
|
|
|
dma_map_error: |
|
smbdirect_mr->state = MR_ERROR; |
|
if (atomic_dec_and_test(&info->mr_used_count)) |
|
wake_up(&info->wait_for_mr_cleanup); |
|
|
|
smbd_disconnect_rdma_connection(info); |
|
|
|
return NULL; |
|
} |
|
|
|
static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct smbd_mr *smbdirect_mr; |
|
struct ib_cqe *cqe; |
|
|
|
cqe = wc->wr_cqe; |
|
smbdirect_mr = container_of(cqe, struct smbd_mr, cqe); |
|
smbdirect_mr->state = MR_INVALIDATED; |
|
if (wc->status != IB_WC_SUCCESS) { |
|
log_rdma_mr(ERR, "invalidate failed status=%x\n", wc->status); |
|
smbdirect_mr->state = MR_ERROR; |
|
} |
|
complete(&smbdirect_mr->invalidate_done); |
|
} |
|
|
|
/* |
|
* Deregister a MR after I/O is done |
|
* This function may wait if remote invalidation is not used |
|
* and we have to locally invalidate the buffer to prevent data is being |
|
* modified by remote peer after upper layer consumes it |
|
*/ |
|
int smbd_deregister_mr(struct smbd_mr *smbdirect_mr) |
|
{ |
|
struct ib_send_wr *wr; |
|
struct smbd_connection *info = smbdirect_mr->conn; |
|
int rc = 0; |
|
|
|
if (smbdirect_mr->need_invalidate) { |
|
/* Need to finish local invalidation before returning */ |
|
wr = &smbdirect_mr->inv_wr; |
|
wr->opcode = IB_WR_LOCAL_INV; |
|
smbdirect_mr->cqe.done = local_inv_done; |
|
wr->wr_cqe = &smbdirect_mr->cqe; |
|
wr->num_sge = 0; |
|
wr->ex.invalidate_rkey = smbdirect_mr->mr->rkey; |
|
wr->send_flags = IB_SEND_SIGNALED; |
|
|
|
init_completion(&smbdirect_mr->invalidate_done); |
|
rc = ib_post_send(info->id->qp, wr, NULL); |
|
if (rc) { |
|
log_rdma_mr(ERR, "ib_post_send failed rc=%x\n", rc); |
|
smbd_disconnect_rdma_connection(info); |
|
goto done; |
|
} |
|
wait_for_completion(&smbdirect_mr->invalidate_done); |
|
smbdirect_mr->need_invalidate = false; |
|
} else |
|
/* |
|
* For remote invalidation, just set it to MR_INVALIDATED |
|
* and defer to mr_recovery_work to recover the MR for next use |
|
*/ |
|
smbdirect_mr->state = MR_INVALIDATED; |
|
|
|
if (smbdirect_mr->state == MR_INVALIDATED) { |
|
ib_dma_unmap_sg( |
|
info->id->device, smbdirect_mr->sgl, |
|
smbdirect_mr->sgl_count, |
|
smbdirect_mr->dir); |
|
smbdirect_mr->state = MR_READY; |
|
if (atomic_inc_return(&info->mr_ready_count) == 1) |
|
wake_up_interruptible(&info->wait_mr); |
|
} else |
|
/* |
|
* Schedule the work to do MR recovery for future I/Os MR |
|
* recovery is slow and don't want it to block current I/O |
|
*/ |
|
queue_work(info->workqueue, &info->mr_recovery_work); |
|
|
|
done: |
|
if (atomic_dec_and_test(&info->mr_used_count)) |
|
wake_up(&info->wait_for_mr_cleanup); |
|
|
|
return rc; |
|
}
|
|
|