mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
773 lines
19 KiB
773 lines
19 KiB
// 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 <[email protected]> |
|
* Copyright (C) 2006 by Russ Cox <[email protected]> |
|
* Copyright (C) 2004-2005 by Latchesar Ionkov <[email protected]> |
|
* Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]> |
|
* Copyright (C) 1997-2002 by Ron Minnich <[email protected]> |
|
*/ |
|
|
|
#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(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 <[email protected]>"); |
|
MODULE_DESCRIPTION("RDMA Transport for 9P"); |
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
|