| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/fs/9p/trans_rdma.c |
| * |
| * RDMA transport layer based on the trans_fd.c implementation. |
| * |
| * Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com> |
| * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> |
| * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
| * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/in.h> |
| #include <linux/module.h> |
| #include <linux/net.h> |
| #include <linux/ipv6.h> |
| #include <linux/kthread.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/un.h> |
| #include <linux/uaccess.h> |
| #include <linux/inet.h> |
| #include <linux/idr.h> |
| #include <linux/file.h> |
| #include <linux/parser.h> |
| #include <linux/semaphore.h> |
| #include <linux/slab.h> |
| #include <linux/seq_file.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/client.h> |
| #include <net/9p/transport.h> |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| |
| #define P9_PORT 5640 |
| #define P9_RDMA_SQ_DEPTH 32 |
| #define P9_RDMA_RQ_DEPTH 32 |
| #define P9_RDMA_SEND_SGE 4 |
| #define P9_RDMA_RECV_SGE 4 |
| #define P9_RDMA_IRD 0 |
| #define P9_RDMA_ORD 0 |
| #define P9_RDMA_TIMEOUT 30000 /* 30 seconds */ |
| #define P9_RDMA_MAXSIZE (1024*1024) /* 1MB */ |
| |
| /** |
| * struct p9_trans_rdma - RDMA transport instance |
| * |
| * @state: tracks the transport state machine for connection setup and tear down |
| * @cm_id: The RDMA CM ID |
| * @pd: Protection Domain pointer |
| * @qp: Queue Pair pointer |
| * @cq: Completion Queue pointer |
| * @timeout: Number of uSecs to wait for connection management events |
| * @privport: Whether a privileged port may be used |
| * @port: The port to use |
| * @sq_depth: The depth of the Send Queue |
| * @sq_sem: Semaphore for the SQ |
| * @rq_depth: The depth of the Receive Queue. |
| * @rq_sem: Semaphore for the RQ |
| * @excess_rc : Amount of posted Receive Contexts without a pending request. |
| * See rdma_request() |
| * @addr: The remote peer's address |
| * @req_lock: Protects the active request list |
| * @cm_done: Completion event for connection management tracking |
| */ |
| struct p9_trans_rdma { |
| enum { |
| P9_RDMA_INIT, |
| P9_RDMA_ADDR_RESOLVED, |
| P9_RDMA_ROUTE_RESOLVED, |
| P9_RDMA_CONNECTED, |
| P9_RDMA_FLUSHING, |
| P9_RDMA_CLOSING, |
| P9_RDMA_CLOSED, |
| } state; |
| struct rdma_cm_id *cm_id; |
| struct ib_pd *pd; |
| struct ib_qp *qp; |
| struct ib_cq *cq; |
| long timeout; |
| bool privport; |
| u16 port; |
| int sq_depth; |
| struct semaphore sq_sem; |
| int rq_depth; |
| struct semaphore rq_sem; |
| atomic_t excess_rc; |
| struct sockaddr_in addr; |
| spinlock_t req_lock; |
| |
| struct completion cm_done; |
| }; |
| |
| struct p9_rdma_req; |
| |
| /** |
| * struct p9_rdma_context - Keeps track of in-process WR |
| * |
| * @cqe: completion queue entry |
| * @busa: Bus address to unmap when the WR completes |
| * @req: Keeps track of requests (send) |
| * @rc: Keepts track of replies (receive) |
| */ |
| struct p9_rdma_context { |
| struct ib_cqe cqe; |
| dma_addr_t busa; |
| union { |
| struct p9_req_t *req; |
| struct p9_fcall rc; |
| }; |
| }; |
| |
| /** |
| * struct p9_rdma_opts - Collection of mount options |
| * @port: port of connection |
| * @privport: Whether a privileged port may be used |
| * @sq_depth: The requested depth of the SQ. This really doesn't need |
| * to be any deeper than the number of threads used in the client |
| * @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth |
| * @timeout: Time to wait in msecs for CM events |
| */ |
| struct p9_rdma_opts { |
| short port; |
| bool privport; |
| int sq_depth; |
| int rq_depth; |
| long timeout; |
| }; |
| |
| /* |
| * Option Parsing (code inspired by NFS code) |
| */ |
| enum { |
| /* Options that take integer arguments */ |
| Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, |
| /* Options that take no argument */ |
| Opt_privport, |
| Opt_err, |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_port, "port=%u"}, |
| {Opt_sq_depth, "sq=%u"}, |
| {Opt_rq_depth, "rq=%u"}, |
| {Opt_timeout, "timeout=%u"}, |
| {Opt_privport, "privport"}, |
| {Opt_err, NULL}, |
| }; |
| |
| static int p9_rdma_show_options(struct seq_file *m, struct p9_client *clnt) |
| { |
| struct p9_trans_rdma *rdma = clnt->trans; |
| |
| if (rdma->port != P9_PORT) |
| seq_printf(m, ",port=%u", rdma->port); |
| if (rdma->sq_depth != P9_RDMA_SQ_DEPTH) |
| seq_printf(m, ",sq=%u", rdma->sq_depth); |
| if (rdma->rq_depth != P9_RDMA_RQ_DEPTH) |
| seq_printf(m, ",rq=%u", rdma->rq_depth); |
| if (rdma->timeout != P9_RDMA_TIMEOUT) |
| seq_printf(m, ",timeout=%lu", rdma->timeout); |
| if (rdma->privport) |
| seq_puts(m, ",privport"); |
| return 0; |
| } |
| |
| /** |
| * parse_opts - parse mount options into rdma options structure |
| * @params: options string passed from mount |
| * @opts: rdma transport-specific structure to parse options into |
| * |
| * Returns 0 upon success, -ERRNO upon failure |
| */ |
| static int parse_opts(char *params, struct p9_rdma_opts *opts) |
| { |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int option; |
| char *options, *tmp_options; |
| |
| opts->port = P9_PORT; |
| opts->sq_depth = P9_RDMA_SQ_DEPTH; |
| opts->rq_depth = P9_RDMA_RQ_DEPTH; |
| opts->timeout = P9_RDMA_TIMEOUT; |
| opts->privport = false; |
| |
| if (!params) |
| return 0; |
| |
| tmp_options = kstrdup(params, GFP_KERNEL); |
| if (!tmp_options) { |
| p9_debug(P9_DEBUG_ERROR, |
| "failed to allocate copy of option string\n"); |
| return -ENOMEM; |
| } |
| options = tmp_options; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token; |
| int r; |
| if (!*p) |
| continue; |
| token = match_token(p, tokens, args); |
| if ((token != Opt_err) && (token != Opt_privport)) { |
| r = match_int(&args[0], &option); |
| if (r < 0) { |
| p9_debug(P9_DEBUG_ERROR, |
| "integer field, but no integer?\n"); |
| continue; |
| } |
| } |
| switch (token) { |
| case Opt_port: |
| opts->port = option; |
| break; |
| case Opt_sq_depth: |
| opts->sq_depth = option; |
| break; |
| case Opt_rq_depth: |
| opts->rq_depth = option; |
| break; |
| case Opt_timeout: |
| opts->timeout = option; |
| break; |
| case Opt_privport: |
| opts->privport = true; |
| break; |
| default: |
| continue; |
| } |
| } |
| /* RQ must be at least as large as the SQ */ |
| opts->rq_depth = max(opts->rq_depth, opts->sq_depth); |
| kfree(tmp_options); |
| return 0; |
| } |
| |
| static int |
| p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event) |
| { |
| struct p9_client *c = id->context; |
| struct p9_trans_rdma *rdma = c->trans; |
| switch (event->event) { |
| case RDMA_CM_EVENT_ADDR_RESOLVED: |
| BUG_ON(rdma->state != P9_RDMA_INIT); |
| rdma->state = P9_RDMA_ADDR_RESOLVED; |
| break; |
| |
| case RDMA_CM_EVENT_ROUTE_RESOLVED: |
| BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED); |
| rdma->state = P9_RDMA_ROUTE_RESOLVED; |
| break; |
| |
| case RDMA_CM_EVENT_ESTABLISHED: |
| BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED); |
| rdma->state = P9_RDMA_CONNECTED; |
| break; |
| |
| case RDMA_CM_EVENT_DISCONNECTED: |
| if (rdma) |
| rdma->state = P9_RDMA_CLOSED; |
| c->status = Disconnected; |
| break; |
| |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
| break; |
| |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| case RDMA_CM_EVENT_ROUTE_ERROR: |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| case RDMA_CM_EVENT_MULTICAST_JOIN: |
| case RDMA_CM_EVENT_MULTICAST_ERROR: |
| case RDMA_CM_EVENT_REJECTED: |
| case RDMA_CM_EVENT_CONNECT_REQUEST: |
| case RDMA_CM_EVENT_CONNECT_RESPONSE: |
| case RDMA_CM_EVENT_CONNECT_ERROR: |
| case RDMA_CM_EVENT_ADDR_ERROR: |
| case RDMA_CM_EVENT_UNREACHABLE: |
| c->status = Disconnected; |
| rdma_disconnect(rdma->cm_id); |
| break; |
| default: |
| BUG(); |
| } |
| complete(&rdma->cm_done); |
| return 0; |
| } |
| |
| static void |
| recv_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct p9_client *client = cq->cq_context; |
| struct p9_trans_rdma *rdma = client->trans; |
| struct p9_rdma_context *c = |
| container_of(wc->wr_cqe, struct p9_rdma_context, cqe); |
| struct p9_req_t *req; |
| int err = 0; |
| int16_t tag; |
| |
| req = NULL; |
| ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize, |
| DMA_FROM_DEVICE); |
| |
| if (wc->status != IB_WC_SUCCESS) |
| goto err_out; |
| |
| c->rc.size = wc->byte_len; |
| err = p9_parse_header(&c->rc, NULL, NULL, &tag, 1); |
| if (err) |
| goto err_out; |
| |
| req = p9_tag_lookup(client, tag); |
| if (!req) |
| goto err_out; |
| |
| /* Check that we have not yet received a reply for this request. |
| */ |
| if (unlikely(req->rc.sdata)) { |
| pr_err("Duplicate reply for request %d", tag); |
| goto err_out; |
| } |
| |
| req->rc.size = c->rc.size; |
| req->rc.sdata = c->rc.sdata; |
| p9_client_cb(client, req, REQ_STATUS_RCVD); |
| |
| out: |
| up(&rdma->rq_sem); |
| kfree(c); |
| return; |
| |
| err_out: |
| p9_debug(P9_DEBUG_ERROR, "req %p err %d status %d\n", |
| req, err, wc->status); |
| rdma->state = P9_RDMA_FLUSHING; |
| client->status = Disconnected; |
| goto out; |
| } |
| |
| static void |
| send_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct p9_client *client = cq->cq_context; |
| struct p9_trans_rdma *rdma = client->trans; |
| struct p9_rdma_context *c = |
| container_of(wc->wr_cqe, struct p9_rdma_context, cqe); |
| |
| ib_dma_unmap_single(rdma->cm_id->device, |
| c->busa, c->req->tc.size, |
| DMA_TO_DEVICE); |
| up(&rdma->sq_sem); |
| p9_req_put(client, c->req); |
| kfree(c); |
| } |
| |
| static void qp_event_handler(struct ib_event *event, void *context) |
| { |
| p9_debug(P9_DEBUG_ERROR, "QP event %d context %p\n", |
| event->event, context); |
| } |
| |
| static void rdma_destroy_trans(struct p9_trans_rdma *rdma) |
| { |
| if (!rdma) |
| return; |
| |
| if (rdma->qp && !IS_ERR(rdma->qp)) |
| ib_destroy_qp(rdma->qp); |
| |
| if (rdma->pd && !IS_ERR(rdma->pd)) |
| ib_dealloc_pd(rdma->pd); |
| |
| if (rdma->cq && !IS_ERR(rdma->cq)) |
| ib_free_cq(rdma->cq); |
| |
| if (rdma->cm_id && !IS_ERR(rdma->cm_id)) |
| rdma_destroy_id(rdma->cm_id); |
| |
| kfree(rdma); |
| } |
| |
| static int |
| post_recv(struct p9_client *client, struct p9_rdma_context *c) |
| { |
| struct p9_trans_rdma *rdma = client->trans; |
| struct ib_recv_wr wr; |
| struct ib_sge sge; |
| |
| c->busa = ib_dma_map_single(rdma->cm_id->device, |
| c->rc.sdata, client->msize, |
| DMA_FROM_DEVICE); |
| if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) |
| goto error; |
| |
| c->cqe.done = recv_done; |
| |
| sge.addr = c->busa; |
| sge.length = client->msize; |
| sge.lkey = rdma->pd->local_dma_lkey; |
| |
| wr.next = NULL; |
| wr.wr_cqe = &c->cqe; |
| wr.sg_list = &sge; |
| wr.num_sge = 1; |
| return ib_post_recv(rdma->qp, &wr, NULL); |
| |
| error: |
| p9_debug(P9_DEBUG_ERROR, "EIO\n"); |
| return -EIO; |
| } |
| |
| static int rdma_request(struct p9_client *client, struct p9_req_t *req) |
| { |
| struct p9_trans_rdma *rdma = client->trans; |
| struct ib_send_wr wr; |
| struct ib_sge sge; |
| int err = 0; |
| unsigned long flags; |
| struct p9_rdma_context *c = NULL; |
| struct p9_rdma_context *rpl_context = NULL; |
| |
| /* When an error occurs between posting the recv and the send, |
| * there will be a receive context posted without a pending request. |
| * Since there is no way to "un-post" it, we remember it and skip |
| * post_recv() for the next request. |
| * So here, |
| * see if we are this `next request' and need to absorb an excess rc. |
| * If yes, then drop and free our own, and do not recv_post(). |
| **/ |
| if (unlikely(atomic_read(&rdma->excess_rc) > 0)) { |
| if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) { |
| /* Got one! */ |
| p9_fcall_fini(&req->rc); |
| req->rc.sdata = NULL; |
| goto dont_need_post_recv; |
| } else { |
| /* We raced and lost. */ |
| atomic_inc(&rdma->excess_rc); |
| } |
| } |
| |
| /* Allocate an fcall for the reply */ |
| rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS); |
| if (!rpl_context) { |
| err = -ENOMEM; |
| goto recv_error; |
| } |
| rpl_context->rc.sdata = req->rc.sdata; |
| |
| /* |
| * Post a receive buffer for this request. We need to ensure |
| * there is a reply buffer available for every outstanding |
| * request. A flushed request can result in no reply for an |
| * outstanding request, so we must keep a count to avoid |
| * overflowing the RQ. |
| */ |
| if (down_interruptible(&rdma->rq_sem)) { |
| err = -EINTR; |
| goto recv_error; |
| } |
| |
| err = post_recv(client, rpl_context); |
| if (err) { |
| p9_debug(P9_DEBUG_ERROR, "POST RECV failed: %d\n", err); |
| goto recv_error; |
| } |
| /* remove posted receive buffer from request structure */ |
| req->rc.sdata = NULL; |
| |
| dont_need_post_recv: |
| /* Post the request */ |
| c = kmalloc(sizeof *c, GFP_NOFS); |
| if (!c) { |
| err = -ENOMEM; |
| goto send_error; |
| } |
| c->req = req; |
| |
| c->busa = ib_dma_map_single(rdma->cm_id->device, |
| c->req->tc.sdata, c->req->tc.size, |
| DMA_TO_DEVICE); |
| 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"); |