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9931a07d51
Pull AFS updates from Al Viro: "AFS series, with some iov_iter bits included" * 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (26 commits) missing bits of "iov_iter: Separate type from direction and use accessor functions" afs: Probe multiple fileservers simultaneously afs: Fix callback handling afs: Eliminate the address pointer from the address list cursor afs: Allow dumping of server cursor on operation failure afs: Implement YFS support in the fs client afs: Expand data structure fields to support YFS afs: Get the target vnode in afs_rmdir() and get a callback on it afs: Calc callback expiry in op reply delivery afs: Fix FS.FetchStatus delivery from updating wrong vnode afs: Implement the YFS cache manager service afs: Remove callback details from afs_callback_break struct afs: Commit the status on a new file/dir/symlink afs: Increase to 64-bit volume ID and 96-bit vnode ID for YFS afs: Don't invoke the server to read data beyond EOF afs: Add a couple of tracepoints to log I/O errors afs: Handle EIO from delivery function afs: Fix TTL on VL server and address lists afs: Implement VL server rotation afs: Improve FS server rotation error handling ...
2652 lines
75 KiB
C
2652 lines
75 KiB
C
/*
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* Copyright (C) 2017, Microsoft Corporation.
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*
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* Author(s): Long Li <longli@microsoft.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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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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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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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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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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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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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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/* SMBD version number */
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#define SMBD_V1 0x0100
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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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/* Address lookup and resolve timeout in ms */
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#define RDMA_RESOLVE_TIMEOUT 5000
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/* SMBD negotiation timeout in seconds */
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#define SMBD_NEGOTIATE_TIMEOUT 120
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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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* 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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/* 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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* 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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/* The remote peer's credit request of local peer */
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int smbd_send_credit_target = 255;
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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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/* 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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/* The maximum single-message size which can be received */
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int smbd_max_receive_size = 8192;
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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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/* 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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/* 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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#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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#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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#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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* Destroy the transport and related RDMA and memory resources
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* Need to go through all the pending counters and make sure on one is using
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* the transport while it is destroyed
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*/
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static void smbd_destroy_rdma_work(struct work_struct *work)
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{
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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, destroy_work);
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unsigned long flags;
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log_rdma_event(INFO, "destroying qp\n");
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ib_drain_qp(info->id->qp);
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rdma_destroy_qp(info->id);
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/* Unblock all I/O waiting on the send queue */
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wake_up_interruptible_all(&info->wait_send_queue);
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log_rdma_event(INFO, "cancelling idle timer\n");
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cancel_delayed_work_sync(&info->idle_timer_work);
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log_rdma_event(INFO, "cancelling send immediate work\n");
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cancel_delayed_work_sync(&info->send_immediate_work);
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log_rdma_event(INFO, "wait for all send to finish\n");
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wait_event(info->wait_smbd_send_pending,
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info->smbd_send_pending == 0);
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log_rdma_event(INFO, "wait for all recv to finish\n");
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wake_up_interruptible(&info->wait_reassembly_queue);
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wait_event(info->wait_smbd_recv_pending,
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info->smbd_recv_pending == 0);
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log_rdma_event(INFO, "wait for all send posted to IB to finish\n");
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wait_event(info->wait_send_pending,
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atomic_read(&info->send_pending) == 0);
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wait_event(info->wait_send_payload_pending,
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atomic_read(&info->send_payload_pending) == 0);
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log_rdma_event(INFO, "freeing mr list\n");
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wake_up_interruptible_all(&info->wait_mr);
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wait_event(info->wait_for_mr_cleanup,
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atomic_read(&info->mr_used_count) == 0);
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destroy_mr_list(info);
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/* It's not posssible for upper layer to get to reassembly */
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log_rdma_event(INFO, "drain the reassembly queue\n");
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do {
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spin_lock_irqsave(&info->reassembly_queue_lock, flags);
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response = _get_first_reassembly(info);
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if (response) {
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list_del(&response->list);
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spin_unlock_irqrestore(
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&info->reassembly_queue_lock, flags);
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put_receive_buffer(info, response);
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} else
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spin_unlock_irqrestore(&info->reassembly_queue_lock, flags);
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} while (response);
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info->reassembly_data_length = 0;
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log_rdma_event(INFO, "free receive buffers\n");
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wait_event(info->wait_receive_queues,
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info->count_receive_queue + info->count_empty_packet_queue
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== info->receive_credit_max);
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destroy_receive_buffers(info);
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ib_free_cq(info->send_cq);
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ib_free_cq(info->recv_cq);
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ib_dealloc_pd(info->pd);
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rdma_destroy_id(info->id);
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/* free mempools */
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mempool_destroy(info->request_mempool);
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kmem_cache_destroy(info->request_cache);
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mempool_destroy(info->response_mempool);
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kmem_cache_destroy(info->response_cache);
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info->transport_status = SMBD_DESTROYED;
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wake_up_all(&info->wait_destroy);
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}
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static int smbd_process_disconnected(struct smbd_connection *info)
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{
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schedule_work(&info->destroy_work);
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return 0;
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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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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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/* 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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log_rdma_event(INFO, "event=%d status=%d\n",
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event->event, event->status);
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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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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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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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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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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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smbd_process_disconnected(info);
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break;
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default:
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break;
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}
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return 0;
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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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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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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 (request->has_payload) {
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if (atomic_dec_and_test(&request->info->send_payload_pending))
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wake_up(&request->info->wait_send_payload_pending);
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} else {
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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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}
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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 "
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"negotiated_version %u credits_requested %u "
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"credits_granted %u status %u max_readwrite_size %u "
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"preferred_send_size %u max_receive_size %u "
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"max_fragmented_size %u\n",
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resp->min_version, resp->max_version, resp->negotiated_version,
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resp->credits_requested, 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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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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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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atomic_set(&info->receive_credits, 0);
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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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}
|
|
info->max_receive_size = le32_to_cpu(packet->preferred_send_size);
|
|
|
|
if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) {
|
|
log_rdma_event(ERR, "error: max_receive_size=%d\n",
|
|
le32_to_cpu(packet->max_receive_size));
|
|
return false;
|
|
}
|
|
info->max_send_size = min_t(int, info->max_send_size,
|
|
le32_to_cpu(packet->max_receive_size));
|
|
|
|
if (le32_to_cpu(packet->max_fragmented_size) <
|
|
SMBD_MIN_FRAGMENTED_SIZE) {
|
|
log_rdma_event(ERR, "error: max_fragmented_size=%d\n",
|
|
le32_to_cpu(packet->max_fragmented_size));
|
|
return false;
|
|
}
|
|
info->max_fragmented_send_size =
|
|
le32_to_cpu(packet->max_fragmented_size);
|
|
info->rdma_readwrite_threshold =
|
|
rdma_readwrite_threshold > info->max_fragmented_send_size ?
|
|
info->max_fragmented_send_size :
|
|
rdma_readwrite_threshold;
|
|
|
|
|
|
info->max_readwrite_size = min_t(u32,
|
|
le32_to_cpu(packet->max_readwrite_size),
|
|
info->max_frmr_depth * PAGE_SIZE);
|
|
info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Check and schedule to send an immediate packet
|
|
* This is used to extend credtis to remote peer to keep the transport busy
|
|
*/
|
|
static void check_and_send_immediate(struct smbd_connection *info)
|
|
{
|
|
if (info->transport_status != SMBD_CONNECTED)
|
|
return;
|
|
|
|
info->send_immediate = true;
|
|
|
|
/*
|
|
* Promptly send a packet if our peer is running low on receive
|
|
* credits
|
|
*/
|
|
if (atomic_read(&info->receive_credits) <
|
|
info->receive_credit_target - 1)
|
|
queue_delayed_work(
|
|
info->workqueue, &info->send_immediate_work, 0);
|
|
}
|
|
|
|
static void smbd_post_send_credits(struct work_struct *work)
|
|
{
|
|
int ret = 0;
|
|
int use_receive_queue = 1;
|
|
int rc;
|
|
struct smbd_response *response;
|
|
struct smbd_connection *info =
|
|
container_of(work, struct smbd_connection,
|
|
post_send_credits_work);
|
|
|
|
if (info->transport_status != SMBD_CONNECTED) {
|
|
wake_up(&info->wait_receive_queues);
|
|
return;
|
|
}
|
|
|
|
if (info->receive_credit_target >
|
|
atomic_read(&info->receive_credits)) {
|
|
while (true) {
|
|
if (use_receive_queue)
|
|
response = get_receive_buffer(info);
|
|
else
|
|
response = get_empty_queue_buffer(info);
|
|
if (!response) {
|
|
/* now switch to emtpy packet queue */
|
|
if (use_receive_queue) {
|
|
use_receive_queue = 0;
|
|
continue;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
response->type = SMBD_TRANSFER_DATA;
|
|
response->first_segment = false;
|
|
rc = smbd_post_recv(info, response);
|
|
if (rc) {
|
|
log_rdma_recv(ERR,
|
|
"post_recv failed rc=%d\n", rc);
|
|
put_receive_buffer(info, response);
|
|
break;
|
|
}
|
|
|
|
ret++;
|
|
}
|
|
}
|
|
|
|
spin_lock(&info->lock_new_credits_offered);
|
|
info->new_credits_offered += ret;
|
|
spin_unlock(&info->lock_new_credits_offered);
|
|
|
|
atomic_add(ret, &info->receive_credits);
|
|
|
|
/* Check if we can post new receive and grant credits to peer */
|
|
check_and_send_immediate(info);
|
|
}
|
|
|
|
static void smbd_recv_done_work(struct work_struct *work)
|
|
{
|
|
struct smbd_connection *info =
|
|
container_of(work, struct smbd_connection, recv_done_work);
|
|
|
|
/*
|
|
* We may have new send credits granted from remote peer
|
|
* If any sender is blcoked on lack of credets, unblock it
|
|
*/
|
|
if (atomic_read(&info->send_credits))
|
|
wake_up_interruptible(&info->wait_send_queue);
|
|
|
|
/*
|
|
* Check if we need to send something to remote peer to
|
|
* grant more credits or respond to KEEP_ALIVE packet
|
|
*/
|
|
check_and_send_immediate(info);
|
|
}
|
|
|
|
/* Called from softirq, when recv is done */
|
|
static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct smbd_data_transfer *data_transfer;
|
|
struct smbd_response *response =
|
|
container_of(wc->wr_cqe, struct smbd_response, cqe);
|
|
struct smbd_connection *info = response->info;
|
|
int data_length = 0;
|
|
|
|
log_rdma_recv(INFO, "response=%p type=%d wc status=%d wc opcode %d "
|
|
"byte_len=%d pkey_index=%x\n",
|
|
response, response->type, wc->status, wc->opcode,
|
|
wc->byte_len, wc->pkey_index);
|
|
|
|
if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) {
|
|
log_rdma_recv(INFO, "wc->status=%d opcode=%d\n",
|
|
wc->status, wc->opcode);
|
|
smbd_disconnect_rdma_connection(info);
|
|
goto error;
|
|
}
|
|
|
|
ib_dma_sync_single_for_cpu(
|
|
wc->qp->device,
|
|
response->sge.addr,
|
|
response->sge.length,
|
|
DMA_FROM_DEVICE);
|
|
|
|
switch (response->type) {
|
|
/* SMBD negotiation response */
|
|
case SMBD_NEGOTIATE_RESP:
|
|
dump_smbd_negotiate_resp(smbd_response_payload(response));
|
|
info->full_packet_received = true;
|
|
info->negotiate_done =
|
|
process_negotiation_response(response, wc->byte_len);
|
|
complete(&info->negotiate_completion);
|
|
break;
|
|
|
|
/* SMBD data transfer packet */
|
|
case SMBD_TRANSFER_DATA:
|
|
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)
|
|
response->first_segment = true;
|
|
|
|
if (le32_to_cpu(data_transfer->remaining_data_length))
|
|
info->full_packet_received = false;
|
|
else
|
|
info->full_packet_received = true;
|
|
|
|
enqueue_reassembly(
|
|
info,
|
|
response,
|
|
data_length);
|
|
} else
|
|
put_empty_packet(info, response);
|
|
|
|
if (data_length)
|
|
wake_up_interruptible(&info->wait_reassembly_queue);
|
|
|
|
atomic_dec(&info->receive_credits);
|
|
info->receive_credit_target =
|
|
le16_to_cpu(data_transfer->credits_requested);
|
|
atomic_add(le16_to_cpu(data_transfer->credits_granted),
|
|
&info->send_credits);
|
|
|
|
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;
|
|
}
|
|
|
|
queue_work(info->workqueue, &info->recv_done_work);
|
|
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);
|
|
|
|
request->has_payload = false;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Build and prepare the SMBD packet header
|
|
* This function waits for avaialbe send credits and build a SMBD packet
|
|
* header. The caller then optional append payload to the packet after
|
|
* the header
|
|
* intput values
|
|
* size: the size of the payload
|
|
* remaining_data_length: remaining data to send if this is part of a
|
|
* fragmented packet
|
|
* output values
|
|
* request_out: the request allocated from this function
|
|
* return values: 0 on success, otherwise actual error code returned
|
|
*/
|
|
static int smbd_create_header(struct smbd_connection *info,
|
|
int size, int remaining_data_length,
|
|
struct smbd_request **request_out)
|
|
{
|
|
struct smbd_request *request;
|
|
struct smbd_data_transfer *packet;
|
|
int header_length;
|
|
int rc;
|
|
|
|
/* 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)
|
|
return rc;
|
|
|
|
if (info->transport_status != SMBD_CONNECTED) {
|
|
log_outgoing(ERR, "disconnected not sending\n");
|
|
return -ENOENT;
|
|
}
|
|
atomic_dec(&info->send_credits);
|
|
|
|
request = mempool_alloc(info->request_mempool, GFP_KERNEL);
|
|
if (!request) {
|
|
rc = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
request->info = info;
|
|
|
|
/* Fill in the packet header */
|
|
packet = smbd_request_payload(request);
|
|
packet->credits_requested = cpu_to_le16(info->send_credit_target);
|
|
packet->credits_granted =
|
|
cpu_to_le16(manage_credits_prior_sending(info));
|
|
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 (!size)
|
|
packet->data_offset = 0;
|
|
else
|
|
packet->data_offset = cpu_to_le32(24);
|
|
packet->data_length = cpu_to_le32(size);
|
|
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 (!size)
|
|
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_BIDIRECTIONAL);
|
|
if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
|
|
mempool_free(request, info->request_mempool);
|
|
rc = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
request->sge[0].length = header_length;
|
|
request->sge[0].lkey = info->pd->local_dma_lkey;
|
|
|
|
*request_out = request;
|
|
return 0;
|
|
|
|
err:
|
|
atomic_inc(&info->send_credits);
|
|
return rc;
|
|
}
|
|
|
|
static void smbd_destroy_header(struct smbd_connection *info,
|
|
struct smbd_request *request)
|
|
{
|
|
|
|
ib_dma_unmap_single(info->id->device,
|
|
request->sge[0].addr,
|
|
request->sge[0].length,
|
|
DMA_TO_DEVICE);
|
|
mempool_free(request, info->request_mempool);
|
|
atomic_inc(&info->send_credits);
|
|
}
|
|
|
|
/* Post the send request */
|
|
static int smbd_post_send(struct smbd_connection *info,
|
|
struct smbd_request *request, bool has_payload)
|
|
{
|
|
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;
|
|
|
|
if (has_payload) {
|
|
request->has_payload = true;
|
|
atomic_inc(&info->send_payload_pending);
|
|
} else {
|
|
request->has_payload = false;
|
|
atomic_inc(&info->send_pending);
|
|
}
|
|
|
|
rc = ib_post_send(info->id->qp, &send_wr, NULL);
|
|
if (rc) {
|
|
log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
|
|
if (has_payload) {
|
|
if (atomic_dec_and_test(&info->send_payload_pending))
|
|
wake_up(&info->wait_send_payload_pending);
|
|
} else {
|
|
if (atomic_dec_and_test(&info->send_pending))
|
|
wake_up(&info->wait_send_pending);
|
|
}
|
|
smbd_disconnect_rdma_connection(info);
|
|
} 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;
|
|
struct smbd_request *request;
|
|
struct scatterlist *sg;
|
|
|
|
rc = smbd_create_header(
|
|
info, data_length, remaining_data_length, &request);
|
|
if (rc)
|
|
return rc;
|
|
|
|
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_BIDIRECTIONAL);
|
|
if (ib_dma_mapping_error(
|
|
info->id->device, request->sge[i+1].addr)) {
|
|
rc = -EIO;
|
|
request->sge[i+1].addr = 0;
|
|
goto dma_mapping_failure;
|
|
}
|
|
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, data_length);
|
|
if (!rc)
|
|
return 0;
|
|
|
|
dma_mapping_failure:
|
|
for (i = 1; 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);
|
|
smbd_destroy_header(info, request);
|
|
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 -ENOMEM;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Check and send an immediate or keep alive packet
|
|
* The condition to send those packets are defined in [MS-SMBD] 3.1.1.1
|
|
* Connection.KeepaliveRequested and Connection.SendImmediate
|
|
* The idea is to extend credits to server as soon as it becomes available
|
|
*/
|
|
static void send_immediate_work(struct work_struct *work)
|
|
{
|
|
struct smbd_connection *info = container_of(
|
|
work, struct smbd_connection,
|
|
send_immediate_work.work);
|
|
|
|
if (info->keep_alive_requested == KEEP_ALIVE_PENDING ||
|
|
info->send_immediate) {
|
|
log_keep_alive(INFO, "send an empty message\n");
|
|
smbd_post_send_empty(info);
|
|
}
|
|
}
|
|
|
|
/* 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 this SMBD connection, called from upper layer */
|
|
void smbd_destroy(struct smbd_connection *info)
|
|
{
|
|
log_rdma_event(INFO, "destroying rdma session\n");
|
|
|
|
/* Kick off the disconnection process */
|
|
smbd_disconnect_rdma_connection(info);
|
|
|
|
log_rdma_event(INFO, "wait for transport being destroyed\n");
|
|
wait_event(info->wait_destroy,
|
|
info->transport_status == SMBD_DESTROYED);
|
|
|
|
destroy_workqueue(info->workqueue);
|
|
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_disconnect_rdma_connection(server->smbd_conn);
|
|
}
|
|
|
|
/* wait until the transport is destroyed */
|
|
if (!wait_event_timeout(server->smbd_conn->wait_destroy,
|
|
server->smbd_conn->transport_status == SMBD_DESTROYED, 5*HZ))
|
|
return -EAGAIN;
|
|
|
|
destroy_workqueue(server->smbd_conn->workqueue);
|
|
kfree(server->smbd_conn);
|
|
|
|
create_conn:
|
|
log_rdma_event(INFO, "creating rdma session\n");
|
|
server->smbd_conn = smbd_get_connection(
|
|
server, (struct sockaddr *) &server->dstaddr);
|
|
log_rdma_event(INFO, "created rdma session info=%p\n",
|
|
server->smbd_conn);
|
|
|
|
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;
|
|
|
|
snprintf(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;
|
|
|
|
snprintf(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;
|
|
|
|
snprintf(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(info->id->device, info,
|
|
info->send_credit_target, 0, IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(info->send_cq)) {
|
|
info->send_cq = NULL;
|
|
goto alloc_cq_failed;
|
|
}
|
|
|
|
info->recv_cq = ib_alloc_cq(info->id->device, info,
|
|
info->receive_credit_max, 0, 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->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;
|
|
init_waitqueue_head(&info->wait_destroy);
|
|
|
|
log_rdma_event(INFO, "connecting to IP %pI4 port %d\n",
|
|
&addr_in->sin_addr, port);
|
|
|
|
init_waitqueue_head(&info->conn_wait);
|
|
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_waitqueue_head(&info->wait_reassembly_queue);
|
|
|
|
INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer);
|
|
INIT_DELAYED_WORK(&info->send_immediate_work, send_immediate_work);
|
|
queue_delayed_work(info->workqueue, &info->idle_timer_work,
|
|
info->keep_alive_interval*HZ);
|
|
|
|
init_waitqueue_head(&info->wait_smbd_send_pending);
|
|
info->smbd_send_pending = 0;
|
|
|
|
init_waitqueue_head(&info->wait_smbd_recv_pending);
|
|
info->smbd_recv_pending = 0;
|
|
|
|
init_waitqueue_head(&info->wait_send_pending);
|
|
atomic_set(&info->send_pending, 0);
|
|
|
|
init_waitqueue_head(&info->wait_send_payload_pending);
|
|
atomic_set(&info->send_payload_pending, 0);
|
|
|
|
INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work);
|
|
INIT_WORK(&info->destroy_work, smbd_destroy_rdma_work);
|
|
INIT_WORK(&info->recv_done_work, smbd_recv_done_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(info);
|
|
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:
|
|
if (info->transport_status != SMBD_CONNECTED) {
|
|
log_read(ERR, "disconnected\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* 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 -ENODEV;
|
|
|
|
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;
|
|
|
|
info->smbd_recv_pending++;
|
|
|
|
if (iov_iter_rw(&msg->msg_iter) == WRITE) {
|
|
/* It's a bug in upper layer to get there */
|
|
cifs_dbg(VFS, "CIFS: 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, "CIFS: invalid msg type %d\n",
|
|
iov_iter_type(&msg->msg_iter));
|
|
rc = -EINVAL;
|
|
}
|
|
|
|
out:
|
|
info->smbd_recv_pending--;
|
|
wake_up(&info->wait_smbd_recv_pending);
|
|
|
|
/* 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, struct smb_rqst *rqst)
|
|
{
|
|
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;
|
|
|
|
info->smbd_send_pending++;
|
|
if (info->transport_status != SMBD_CONNECTED) {
|
|
rc = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Skip the RFC1002 length defined in MS-SMB2 section 2.1
|
|
* It is used only for TCP transport in the iov[0]
|
|
* In future we may want to add a transport layer under protocol
|
|
* layer so this will only be issued to TCP transport
|
|
*/
|
|
|
|
if (rqst->rq_iov[0].iov_len != 4) {
|
|
log_write(ERR, "expected the pdu length in 1st iov, but got %zu\n", rqst->rq_iov[0].iov_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
buflen = smb_rqst_len(server, rqst);
|
|
|
|
if (buflen + sizeof(struct smbd_data_transfer) >
|
|
info->max_fragmented_send_size) {
|
|
log_write(ERR, "payload size %d > max size %d\n",
|
|
buflen, info->max_fragmented_send_size);
|
|
rc = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
iov = &rqst->rq_iov[1];
|
|
|
|
cifs_dbg(FYI, "Sending smb (RDMA): smb_len=%u\n", buflen);
|
|
for (i = 0; i < rqst->rq_nvec-1; i++)
|
|
dump_smb(iov[i].iov_base, iov[i].iov_len);
|
|
|
|
remaining_data_length = buflen;
|
|
|
|
log_write(INFO, "rqst->rq_nvec=%d rqst->rq_npages=%d rq_pagesz=%d "
|
|
"rq_tailsz=%d buflen=%d\n",
|
|
rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz,
|
|
rqst->rq_tailsz, buflen);
|
|
|
|
start = i = iov[0].iov_len ? 0 : 1;
|
|
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-1)
|
|
break;
|
|
}
|
|
start = i;
|
|
buflen = 0;
|
|
} else {
|
|
i++;
|
|
if (i == rqst->rq_nvec-1) {
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
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_payload_pending,
|
|
atomic_read(&info->send_payload_pending) == 0);
|
|
|
|
info->smbd_send_pending--;
|
|
wake_up(&info->wait_smbd_send_pending);
|
|
|
|
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_INVALIDATED)
|
|
ib_dma_unmap_sg(
|
|
info->id->device, smbdirect_mr->sgl,
|
|
smbdirect_mr->sgl_count,
|
|
smbdirect_mr->dir);
|
|
else 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;
|
|
|
|
/*
|
|
* Schedule the work to do MR recovery for future I/Os
|
|
* MR recovery is slow and we don't want it to block the 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;
|
|
}
|