![Chuck Lever](/assets/img/avatar_default.png)
Send and Receive completion is handled on a single CPU selected at the time each Completion Queue is allocated. Typically this is when an initiator instantiates an RDMA transport, or when a target accepts an RDMA connection. Some ULPs cannot open a connection per CPU to spread completion workload across available CPUs and MSI vectors. For such ULPs, provide an API that allows the RDMA core to select a completion vector based on the device's complement of available comp_vecs. ULPs that invoke ib_alloc_cq() with only comp_vector 0 are converted to use the new API so that their completion workloads interfere less with each other. Suggested-by: HÃ¥kon Bugge <haakon.bugge@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Cc: <linux-cifs@vger.kernel.org> Cc: <v9fs-developer@lists.sourceforge.net> Link: https://lore.kernel.org/r/20190729171923.13428.52555.stgit@manet.1015granger.net Signed-off-by: Doug Ledford <dledford@redhat.com>
771 lines
18 KiB
C
771 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/9p/trans_rdma.c
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*
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* RDMA transport layer based on the trans_fd.c implementation.
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*
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* Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com>
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* Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
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* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/in.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/kthread.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/un.h>
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#include <linux/uaccess.h>
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#include <linux/inet.h>
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#include <linux/idr.h>
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#include <linux/file.h>
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#include <linux/parser.h>
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#include <linux/semaphore.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#define P9_PORT 5640
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#define P9_RDMA_SQ_DEPTH 32
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#define P9_RDMA_RQ_DEPTH 32
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#define P9_RDMA_SEND_SGE 4
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#define P9_RDMA_RECV_SGE 4
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#define P9_RDMA_IRD 0
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#define P9_RDMA_ORD 0
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#define P9_RDMA_TIMEOUT 30000 /* 30 seconds */
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#define P9_RDMA_MAXSIZE (1024*1024) /* 1MB */
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/**
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* struct p9_trans_rdma - RDMA transport instance
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*
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* @state: tracks the transport state machine for connection setup and tear down
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* @cm_id: The RDMA CM ID
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* @pd: Protection Domain pointer
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* @qp: Queue Pair pointer
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* @cq: Completion Queue pointer
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* @timeout: Number of uSecs to wait for connection management events
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* @privport: Whether a privileged port may be used
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* @port: The port to use
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* @sq_depth: The depth of the Send Queue
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* @sq_sem: Semaphore for the SQ
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* @rq_depth: The depth of the Receive Queue.
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* @rq_sem: Semaphore for the RQ
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* @excess_rc : Amount of posted Receive Contexts without a pending request.
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* See rdma_request()
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* @addr: The remote peer's address
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* @req_lock: Protects the active request list
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* @cm_done: Completion event for connection management tracking
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*/
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struct p9_trans_rdma {
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enum {
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P9_RDMA_INIT,
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P9_RDMA_ADDR_RESOLVED,
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P9_RDMA_ROUTE_RESOLVED,
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P9_RDMA_CONNECTED,
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P9_RDMA_FLUSHING,
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P9_RDMA_CLOSING,
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P9_RDMA_CLOSED,
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} state;
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struct rdma_cm_id *cm_id;
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struct ib_pd *pd;
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struct ib_qp *qp;
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struct ib_cq *cq;
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long timeout;
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bool privport;
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u16 port;
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int sq_depth;
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struct semaphore sq_sem;
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int rq_depth;
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struct semaphore rq_sem;
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atomic_t excess_rc;
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struct sockaddr_in addr;
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spinlock_t req_lock;
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struct completion cm_done;
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};
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/**
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* p9_rdma_context - Keeps track of in-process WR
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*
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* @busa: Bus address to unmap when the WR completes
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* @req: Keeps track of requests (send)
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* @rc: Keepts track of replies (receive)
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*/
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struct p9_rdma_req;
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struct p9_rdma_context {
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struct ib_cqe cqe;
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dma_addr_t busa;
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union {
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struct p9_req_t *req;
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struct p9_fcall rc;
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};
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};
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/**
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* p9_rdma_opts - Collection of mount options
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* @port: port of connection
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* @sq_depth: The requested depth of the SQ. This really doesn't need
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* to be any deeper than the number of threads used in the client
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* @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth
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* @timeout: Time to wait in msecs for CM events
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*/
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struct p9_rdma_opts {
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short port;
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bool privport;
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int sq_depth;
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int rq_depth;
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long timeout;
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};
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/*
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* Option Parsing (code inspired by NFS code)
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*/
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enum {
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/* Options that take integer arguments */
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Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout,
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/* Options that take no argument */
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Opt_privport,
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Opt_err,
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};
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static match_table_t tokens = {
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{Opt_port, "port=%u"},
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{Opt_sq_depth, "sq=%u"},
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{Opt_rq_depth, "rq=%u"},
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{Opt_timeout, "timeout=%u"},
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{Opt_privport, "privport"},
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{Opt_err, NULL},
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};
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static int p9_rdma_show_options(struct seq_file *m, struct p9_client *clnt)
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{
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struct p9_trans_rdma *rdma = clnt->trans;
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if (rdma->port != P9_PORT)
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seq_printf(m, ",port=%u", rdma->port);
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if (rdma->sq_depth != P9_RDMA_SQ_DEPTH)
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seq_printf(m, ",sq=%u", rdma->sq_depth);
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if (rdma->rq_depth != P9_RDMA_RQ_DEPTH)
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seq_printf(m, ",rq=%u", rdma->rq_depth);
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if (rdma->timeout != P9_RDMA_TIMEOUT)
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seq_printf(m, ",timeout=%lu", rdma->timeout);
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if (rdma->privport)
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seq_puts(m, ",privport");
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return 0;
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}
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/**
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* parse_opts - parse mount options into rdma options structure
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* @params: options string passed from mount
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* @opts: rdma transport-specific structure to parse options into
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*
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* Returns 0 upon success, -ERRNO upon failure
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*/
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static int parse_opts(char *params, struct p9_rdma_opts *opts)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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char *options, *tmp_options;
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opts->port = P9_PORT;
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opts->sq_depth = P9_RDMA_SQ_DEPTH;
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opts->rq_depth = P9_RDMA_RQ_DEPTH;
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opts->timeout = P9_RDMA_TIMEOUT;
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opts->privport = false;
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if (!params)
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return 0;
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tmp_options = kstrdup(params, GFP_KERNEL);
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if (!tmp_options) {
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p9_debug(P9_DEBUG_ERROR,
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"failed to allocate copy of option string\n");
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return -ENOMEM;
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}
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options = tmp_options;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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int r;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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if ((token != Opt_err) && (token != Opt_privport)) {
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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continue;
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}
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}
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switch (token) {
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case Opt_port:
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opts->port = option;
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break;
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case Opt_sq_depth:
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opts->sq_depth = option;
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break;
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case Opt_rq_depth:
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opts->rq_depth = option;
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break;
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case Opt_timeout:
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opts->timeout = option;
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break;
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case Opt_privport:
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opts->privport = true;
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break;
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default:
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continue;
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}
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}
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/* RQ must be at least as large as the SQ */
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opts->rq_depth = max(opts->rq_depth, opts->sq_depth);
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kfree(tmp_options);
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return 0;
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}
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static int
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p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
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{
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struct p9_client *c = id->context;
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struct p9_trans_rdma *rdma = c->trans;
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switch (event->event) {
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case RDMA_CM_EVENT_ADDR_RESOLVED:
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BUG_ON(rdma->state != P9_RDMA_INIT);
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rdma->state = P9_RDMA_ADDR_RESOLVED;
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break;
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
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BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED);
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rdma->state = P9_RDMA_ROUTE_RESOLVED;
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break;
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case RDMA_CM_EVENT_ESTABLISHED:
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BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED);
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rdma->state = P9_RDMA_CONNECTED;
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break;
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case RDMA_CM_EVENT_DISCONNECTED:
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if (rdma)
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rdma->state = P9_RDMA_CLOSED;
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c->status = Disconnected;
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break;
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case RDMA_CM_EVENT_TIMEWAIT_EXIT:
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break;
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case RDMA_CM_EVENT_ADDR_CHANGE:
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case RDMA_CM_EVENT_ROUTE_ERROR:
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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case RDMA_CM_EVENT_MULTICAST_JOIN:
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case RDMA_CM_EVENT_MULTICAST_ERROR:
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case RDMA_CM_EVENT_REJECTED:
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case RDMA_CM_EVENT_CONNECT_REQUEST:
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case RDMA_CM_EVENT_CONNECT_RESPONSE:
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case RDMA_CM_EVENT_CONNECT_ERROR:
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case RDMA_CM_EVENT_ADDR_ERROR:
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case RDMA_CM_EVENT_UNREACHABLE:
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c->status = Disconnected;
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rdma_disconnect(rdma->cm_id);
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break;
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default:
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BUG();
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}
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complete(&rdma->cm_done);
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return 0;
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}
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static void
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recv_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct p9_client *client = cq->cq_context;
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struct p9_trans_rdma *rdma = client->trans;
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struct p9_rdma_context *c =
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container_of(wc->wr_cqe, struct p9_rdma_context, cqe);
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struct p9_req_t *req;
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int err = 0;
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int16_t tag;
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req = NULL;
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ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize,
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DMA_FROM_DEVICE);
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if (wc->status != IB_WC_SUCCESS)
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goto err_out;
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c->rc.size = wc->byte_len;
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err = p9_parse_header(&c->rc, NULL, NULL, &tag, 1);
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if (err)
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goto err_out;
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req = p9_tag_lookup(client, tag);
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if (!req)
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goto err_out;
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/* Check that we have not yet received a reply for this request.
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*/
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if (unlikely(req->rc.sdata)) {
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pr_err("Duplicate reply for request %d", tag);
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goto err_out;
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}
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req->rc.size = c->rc.size;
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req->rc.sdata = c->rc.sdata;
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p9_client_cb(client, req, REQ_STATUS_RCVD);
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out:
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up(&rdma->rq_sem);
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kfree(c);
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return;
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err_out:
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p9_debug(P9_DEBUG_ERROR, "req %p err %d status %d\n",
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req, err, wc->status);
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rdma->state = P9_RDMA_FLUSHING;
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client->status = Disconnected;
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goto out;
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}
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static void
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send_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct p9_client *client = cq->cq_context;
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struct p9_trans_rdma *rdma = client->trans;
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struct p9_rdma_context *c =
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container_of(wc->wr_cqe, struct p9_rdma_context, cqe);
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ib_dma_unmap_single(rdma->cm_id->device,
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c->busa, c->req->tc.size,
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DMA_TO_DEVICE);
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up(&rdma->sq_sem);
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p9_req_put(c->req);
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kfree(c);
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}
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static void qp_event_handler(struct ib_event *event, void *context)
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{
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p9_debug(P9_DEBUG_ERROR, "QP event %d context %p\n",
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event->event, context);
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}
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static void rdma_destroy_trans(struct p9_trans_rdma *rdma)
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{
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if (!rdma)
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return;
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if (rdma->qp && !IS_ERR(rdma->qp))
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ib_destroy_qp(rdma->qp);
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if (rdma->pd && !IS_ERR(rdma->pd))
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ib_dealloc_pd(rdma->pd);
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if (rdma->cq && !IS_ERR(rdma->cq))
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ib_free_cq(rdma->cq);
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if (rdma->cm_id && !IS_ERR(rdma->cm_id))
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rdma_destroy_id(rdma->cm_id);
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kfree(rdma);
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}
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static int
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post_recv(struct p9_client *client, struct p9_rdma_context *c)
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{
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struct p9_trans_rdma *rdma = client->trans;
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struct ib_recv_wr wr;
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struct ib_sge sge;
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c->busa = ib_dma_map_single(rdma->cm_id->device,
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c->rc.sdata, client->msize,
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DMA_FROM_DEVICE);
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if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
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goto error;
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c->cqe.done = recv_done;
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sge.addr = c->busa;
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sge.length = client->msize;
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sge.lkey = rdma->pd->local_dma_lkey;
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wr.next = NULL;
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wr.wr_cqe = &c->cqe;
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wr.sg_list = &sge;
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wr.num_sge = 1;
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return ib_post_recv(rdma->qp, &wr, NULL);
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error:
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p9_debug(P9_DEBUG_ERROR, "EIO\n");
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return -EIO;
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}
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static int rdma_request(struct p9_client *client, struct p9_req_t *req)
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{
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struct p9_trans_rdma *rdma = client->trans;
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struct ib_send_wr wr;
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struct ib_sge sge;
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int err = 0;
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unsigned long flags;
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struct p9_rdma_context *c = NULL;
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struct p9_rdma_context *rpl_context = NULL;
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/* When an error occurs between posting the recv and the send,
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* there will be a receive context posted without a pending request.
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* Since there is no way to "un-post" it, we remember it and skip
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* post_recv() for the next request.
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* So here,
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* see if we are this `next request' and need to absorb an excess rc.
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* If yes, then drop and free our own, and do not recv_post().
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**/
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if (unlikely(atomic_read(&rdma->excess_rc) > 0)) {
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if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) {
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/* Got one! */
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p9_fcall_fini(&req->rc);
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req->rc.sdata = NULL;
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goto dont_need_post_recv;
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} else {
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/* We raced and lost. */
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atomic_inc(&rdma->excess_rc);
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}
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}
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/* Allocate an fcall for the reply */
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rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS);
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if (!rpl_context) {
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err = -ENOMEM;
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goto recv_error;
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}
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rpl_context->rc.sdata = req->rc.sdata;
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/*
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* Post a receive buffer for this request. We need to ensure
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* there is a reply buffer available for every outstanding
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* request. A flushed request can result in no reply for an
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* outstanding request, so we must keep a count to avoid
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* overflowing the RQ.
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*/
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if (down_interruptible(&rdma->rq_sem)) {
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err = -EINTR;
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goto recv_error;
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}
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err = post_recv(client, rpl_context);
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if (err) {
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p9_debug(P9_DEBUG_ERROR, "POST RECV failed: %d\n", err);
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goto recv_error;
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}
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/* remove posted receive buffer from request structure */
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req->rc.sdata = NULL;
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dont_need_post_recv:
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/* Post the request */
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c = kmalloc(sizeof *c, GFP_NOFS);
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if (!c) {
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err = -ENOMEM;
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goto send_error;
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}
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c->req = req;
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c->busa = ib_dma_map_single(rdma->cm_id->device,
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c->req->tc.sdata, c->req->tc.size,
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DMA_TO_DEVICE);
|
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if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) {
|
|
err = -EIO;
|
|
goto send_error;
|
|
}
|
|
|
|
c->cqe.done = send_done;
|
|
|
|
sge.addr = c->busa;
|
|
sge.length = c->req->tc.size;
|
|
sge.lkey = rdma->pd->local_dma_lkey;
|
|
|
|
wr.next = NULL;
|
|
wr.wr_cqe = &c->cqe;
|
|
wr.opcode = IB_WR_SEND;
|
|
wr.send_flags = IB_SEND_SIGNALED;
|
|
wr.sg_list = &sge;
|
|
wr.num_sge = 1;
|
|
|
|
if (down_interruptible(&rdma->sq_sem)) {
|
|
err = -EINTR;
|
|
goto send_error;
|
|
}
|
|
|
|
/* Mark request as `sent' *before* we actually send it,
|
|
* because doing if after could erase the REQ_STATUS_RCVD
|
|
* status in case of a very fast reply.
|
|
*/
|
|
req->status = REQ_STATUS_SENT;
|
|
err = ib_post_send(rdma->qp, &wr, NULL);
|
|
if (err)
|
|
goto send_error;
|
|
|
|
/* Success */
|
|
return 0;
|
|
|
|
/* Handle errors that happened during or while preparing the send: */
|
|
send_error:
|
|
req->status = REQ_STATUS_ERROR;
|
|
kfree(c);
|
|
p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err);
|
|
|
|
/* Ach.
|
|
* We did recv_post(), but not send. We have one recv_post in excess.
|
|
*/
|
|
atomic_inc(&rdma->excess_rc);
|
|
return err;
|
|
|
|
/* Handle errors that happened during or while preparing post_recv(): */
|
|
recv_error:
|
|
kfree(rpl_context);
|
|
spin_lock_irqsave(&rdma->req_lock, flags);
|
|
if (err != -EINTR && rdma->state < P9_RDMA_CLOSING) {
|
|
rdma->state = P9_RDMA_CLOSING;
|
|
spin_unlock_irqrestore(&rdma->req_lock, flags);
|
|
rdma_disconnect(rdma->cm_id);
|
|
} else
|
|
spin_unlock_irqrestore(&rdma->req_lock, flags);
|
|
return err;
|
|
}
|
|
|
|
static void rdma_close(struct p9_client *client)
|
|
{
|
|
struct p9_trans_rdma *rdma;
|
|
|
|
if (!client)
|
|
return;
|
|
|
|
rdma = client->trans;
|
|
if (!rdma)
|
|
return;
|
|
|
|
client->status = Disconnected;
|
|
rdma_disconnect(rdma->cm_id);
|
|
rdma_destroy_trans(rdma);
|
|
}
|
|
|
|
/**
|
|
* alloc_rdma - Allocate and initialize the rdma transport structure
|
|
* @opts: Mount options structure
|
|
*/
|
|
static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts)
|
|
{
|
|
struct p9_trans_rdma *rdma;
|
|
|
|
rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL);
|
|
if (!rdma)
|
|
return NULL;
|
|
|
|
rdma->port = opts->port;
|
|
rdma->privport = opts->privport;
|
|
rdma->sq_depth = opts->sq_depth;
|
|
rdma->rq_depth = opts->rq_depth;
|
|
rdma->timeout = opts->timeout;
|
|
spin_lock_init(&rdma->req_lock);
|
|
init_completion(&rdma->cm_done);
|
|
sema_init(&rdma->sq_sem, rdma->sq_depth);
|
|
sema_init(&rdma->rq_sem, rdma->rq_depth);
|
|
atomic_set(&rdma->excess_rc, 0);
|
|
|
|
return rdma;
|
|
}
|
|
|
|
static int rdma_cancel(struct p9_client *client, struct p9_req_t *req)
|
|
{
|
|
/* Nothing to do here.
|
|
* We will take care of it (if we have to) in rdma_cancelled()
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
/* A request has been fully flushed without a reply.
|
|
* That means we have posted one buffer in excess.
|
|
*/
|
|
static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req)
|
|
{
|
|
struct p9_trans_rdma *rdma = client->trans;
|
|
atomic_inc(&rdma->excess_rc);
|
|
return 0;
|
|
}
|
|
|
|
static int p9_rdma_bind_privport(struct p9_trans_rdma *rdma)
|
|
{
|
|
struct sockaddr_in cl = {
|
|
.sin_family = AF_INET,
|
|
.sin_addr.s_addr = htonl(INADDR_ANY),
|
|
};
|
|
int port, err = -EINVAL;
|
|
|
|
for (port = P9_DEF_MAX_RESVPORT; port >= P9_DEF_MIN_RESVPORT; port--) {
|
|
cl.sin_port = htons((ushort)port);
|
|
err = rdma_bind_addr(rdma->cm_id, (struct sockaddr *)&cl);
|
|
if (err != -EADDRINUSE)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* rdma_create_trans - Transport method for creating a transport instance
|
|
* @client: client instance
|
|
* @addr: IP address string
|
|
* @args: Mount options string
|
|
*/
|
|
static int
|
|
rdma_create_trans(struct p9_client *client, const char *addr, char *args)
|
|
{
|
|
int err;
|
|
struct p9_rdma_opts opts;
|
|
struct p9_trans_rdma *rdma;
|
|
struct rdma_conn_param conn_param;
|
|
struct ib_qp_init_attr qp_attr;
|
|
|
|
if (addr == NULL)
|
|
return -EINVAL;
|
|
|
|
/* Parse the transport specific mount options */
|
|
err = parse_opts(args, &opts);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Create and initialize the RDMA transport structure */
|
|
rdma = alloc_rdma(&opts);
|
|
if (!rdma)
|
|
return -ENOMEM;
|
|
|
|
/* Create the RDMA CM ID */
|
|
rdma->cm_id = rdma_create_id(&init_net, p9_cm_event_handler, client,
|
|
RDMA_PS_TCP, IB_QPT_RC);
|
|
if (IS_ERR(rdma->cm_id))
|
|
goto error;
|
|
|
|
/* Associate the client with the transport */
|
|
client->trans = rdma;
|
|
|
|
/* Bind to a privileged port if we need to */
|
|
if (opts.privport) {
|
|
err = p9_rdma_bind_privport(rdma);
|
|
if (err < 0) {
|
|
pr_err("%s (%d): problem binding to privport: %d\n",
|
|
__func__, task_pid_nr(current), -err);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Resolve the server's address */
|
|
rdma->addr.sin_family = AF_INET;
|
|
rdma->addr.sin_addr.s_addr = in_aton(addr);
|
|
rdma->addr.sin_port = htons(opts.port);
|
|
err = rdma_resolve_addr(rdma->cm_id, NULL,
|
|
(struct sockaddr *)&rdma->addr,
|
|
rdma->timeout);
|
|
if (err)
|
|
goto error;
|
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
|
if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED))
|
|
goto error;
|
|
|
|
/* Resolve the route to the server */
|
|
err = rdma_resolve_route(rdma->cm_id, rdma->timeout);
|
|
if (err)
|
|
goto error;
|
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
|
if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED))
|
|
goto error;
|
|
|
|
/* Create the Completion Queue */
|
|
rdma->cq = ib_alloc_cq_any(rdma->cm_id->device, client,
|
|
opts.sq_depth + opts.rq_depth + 1,
|
|
IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(rdma->cq))
|
|
goto error;
|
|
|
|
/* Create the Protection Domain */
|
|
rdma->pd = ib_alloc_pd(rdma->cm_id->device, 0);
|
|
if (IS_ERR(rdma->pd))
|
|
goto error;
|
|
|
|
/* Create the Queue Pair */
|
|
memset(&qp_attr, 0, sizeof qp_attr);
|
|
qp_attr.event_handler = qp_event_handler;
|
|
qp_attr.qp_context = client;
|
|
qp_attr.cap.max_send_wr = opts.sq_depth;
|
|
qp_attr.cap.max_recv_wr = opts.rq_depth;
|
|
qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE;
|
|
qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE;
|
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
qp_attr.qp_type = IB_QPT_RC;
|
|
qp_attr.send_cq = rdma->cq;
|
|
qp_attr.recv_cq = rdma->cq;
|
|
err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr);
|
|
if (err)
|
|
goto error;
|
|
rdma->qp = rdma->cm_id->qp;
|
|
|
|
/* Request a connection */
|
|
memset(&conn_param, 0, sizeof(conn_param));
|
|
conn_param.private_data = NULL;
|
|
conn_param.private_data_len = 0;
|
|
conn_param.responder_resources = P9_RDMA_IRD;
|
|
conn_param.initiator_depth = P9_RDMA_ORD;
|
|
err = rdma_connect(rdma->cm_id, &conn_param);
|
|
if (err)
|
|
goto error;
|
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
|
if (err || (rdma->state != P9_RDMA_CONNECTED))
|
|
goto error;
|
|
|
|
client->status = Connected;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
rdma_destroy_trans(rdma);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
static struct p9_trans_module p9_rdma_trans = {
|
|
.name = "rdma",
|
|
.maxsize = P9_RDMA_MAXSIZE,
|
|
.def = 0,
|
|
.owner = THIS_MODULE,
|
|
.create = rdma_create_trans,
|
|
.close = rdma_close,
|
|
.request = rdma_request,
|
|
.cancel = rdma_cancel,
|
|
.cancelled = rdma_cancelled,
|
|
.show_options = p9_rdma_show_options,
|
|
};
|
|
|
|
/**
|
|
* p9_trans_rdma_init - Register the 9P RDMA transport driver
|
|
*/
|
|
static int __init p9_trans_rdma_init(void)
|
|
{
|
|
v9fs_register_trans(&p9_rdma_trans);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit p9_trans_rdma_exit(void)
|
|
{
|
|
v9fs_unregister_trans(&p9_rdma_trans);
|
|
}
|
|
|
|
module_init(p9_trans_rdma_init);
|
|
module_exit(p9_trans_rdma_exit);
|
|
|
|
MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
|
|
MODULE_DESCRIPTION("RDMA Transport for 9P");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|