Esempio n. 1
0
/**
 * xprt_rdma_close - close a transport connection
 * @xprt: transport context
 *
 * Called during transport shutdown, reconnect, or device removal.
 * Caller holds @xprt's send lock to prevent activity on this
 * transport while the connection is torn down.
 */
static void
xprt_rdma_close(struct rpc_xprt *xprt)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	struct rpcrdma_ep *ep = &r_xprt->rx_ep;
	struct rpcrdma_ia *ia = &r_xprt->rx_ia;

	dprintk("RPC:       %s: closing xprt %p\n", __func__, xprt);

	if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
		xprt_clear_connected(xprt);
		rpcrdma_ia_remove(ia);
		return;
	}
	if (ep->rep_connected == -ENODEV)
		return;
	if (ep->rep_connected > 0)
		xprt->reestablish_timeout = 0;
	xprt_disconnect_done(xprt);
	rpcrdma_ep_disconnect(ep, ia);

	/* Prepare @xprt for the next connection by reinitializing
	 * its credit grant to one (see RFC 8166, Section 3.3.3).
	 */
	r_xprt->rx_buf.rb_credits = 1;
	xprt->cwnd = RPC_CWNDSHIFT;
}
Esempio n. 2
0
/**
 * xprt_rdma_allocate - allocate transport resources for an RPC
 * @task: RPC task
 *
 * Return values:
 *        0:	Success; rq_buffer points to RPC buffer to use
 *   ENOMEM:	Out of memory, call again later
 *      EIO:	A permanent error occurred, do not retry
 */
static int
xprt_rdma_allocate(struct rpc_task *task)
{
	struct rpc_rqst *rqst = task->tk_rqstp;
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
	gfp_t flags;

	flags = RPCRDMA_DEF_GFP;
	if (RPC_IS_SWAPPER(task))
		flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;

	if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags))
		goto out_fail;
	if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
		goto out_fail;

	rqst->rq_buffer = req->rl_sendbuf->rg_base;
	rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
	trace_xprtrdma_allocate(task, req);
	return 0;

out_fail:
	trace_xprtrdma_allocate(task, NULL);
	return -ENOMEM;
}
static int
rpcrdma_bc_send_request(struct svcxprt_rdma *rdma, struct rpc_rqst *rqst)
{
	struct rpc_xprt *xprt = rqst->rq_xprt;
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	__be32 *p;
	int rc;

	/* Space in the send buffer for an RPC/RDMA header is reserved
	 * via xprt->tsh_size.
	 */
	p = rqst->rq_buffer;
	*p++ = rqst->rq_xid;
	*p++ = rpcrdma_version;
	*p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
	*p++ = rdma_msg;
	*p++ = xdr_zero;
	*p++ = xdr_zero;
	*p   = xdr_zero;

#ifdef SVCRDMA_BACKCHANNEL_DEBUG
	pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer);
#endif

	rc = svc_rdma_bc_sendto(rdma, rqst);
	if (rc)
		goto drop_connection;
	return rc;

drop_connection:
	dprintk("svcrdma: failed to send bc call\n");
	xprt_disconnect_done(xprt);
	return -ENOTCONN;
}
Esempio n. 4
0
static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	long idle_time = 0;

	if (xprt_connected(xprt))
		idle_time = (long)(jiffies - xprt->last_used) / HZ;

	seq_printf(seq,
	  "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
	  "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",

	   0,	/* need a local port? */
	   xprt->stat.bind_count,
	   xprt->stat.connect_count,
	   xprt->stat.connect_time,
	   idle_time,
	   xprt->stat.sends,
	   xprt->stat.recvs,
	   xprt->stat.bad_xids,
	   xprt->stat.req_u,
	   xprt->stat.bklog_u,

	   r_xprt->rx_stats.read_chunk_count,
	   r_xprt->rx_stats.write_chunk_count,
	   r_xprt->rx_stats.reply_chunk_count,
	   r_xprt->rx_stats.total_rdma_request,
	   r_xprt->rx_stats.total_rdma_reply,
	   r_xprt->rx_stats.pullup_copy_count,
	   r_xprt->rx_stats.fixup_copy_count,
	   r_xprt->rx_stats.hardway_register_count,
	   r_xprt->rx_stats.failed_marshal_count,
	   r_xprt->rx_stats.bad_reply_count);
}
/* It shouldn't matter if the number of backchannel session slots
 * doesn't match the number of RPC/RDMA credits. That just means
 * one or the other will have extra slots that aren't used.
 */
static struct rpc_xprt *
xprt_setup_rdma_bc(struct xprt_create *args)
{
	struct rpc_xprt *xprt;
	struct rpcrdma_xprt *new_xprt;

	if (args->addrlen > sizeof(xprt->addr)) {
		dprintk("RPC:       %s: address too large\n", __func__);
		return ERR_PTR(-EBADF);
	}

	xprt = xprt_alloc(args->net, sizeof(*new_xprt),
			  RPCRDMA_MAX_BC_REQUESTS,
			  RPCRDMA_MAX_BC_REQUESTS);
	if (!xprt) {
		dprintk("RPC:       %s: couldn't allocate rpc_xprt\n",
			__func__);
		return ERR_PTR(-ENOMEM);
	}

	xprt->timeout = &xprt_rdma_bc_timeout;
	xprt_set_bound(xprt);
	xprt_set_connected(xprt);
	xprt->bind_timeout = RPCRDMA_BIND_TO;
	xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
	xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;

	xprt->prot = XPRT_TRANSPORT_BC_RDMA;
	xprt->tsh_size = RPCRDMA_HDRLEN_MIN / sizeof(__be32);
	xprt->ops = &xprt_rdma_bc_procs;

	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
	xprt->addrlen = args->addrlen;
	xprt_rdma_format_addresses(xprt, (struct sockaddr *)&xprt->addr);
	xprt->resvport = 0;

	xprt->max_payload = xprt_rdma_max_inline_read;

	new_xprt = rpcx_to_rdmax(xprt);
	new_xprt->rx_buf.rb_bc_max_requests = xprt->max_reqs;

	xprt_get(xprt);
	args->bc_xprt->xpt_bc_xprt = xprt;
	xprt->bc_xprt = args->bc_xprt;

	if (!try_module_get(THIS_MODULE))
		goto out_fail;

	/* Final put for backchannel xprt is in __svc_rdma_free */
	xprt_get(xprt);
	return xprt;

out_fail:
	xprt_rdma_free_addresses(xprt);
	args->bc_xprt->xpt_bc_xprt = NULL;
	args->bc_xprt->xpt_bc_xps = NULL;
	xprt_put(xprt);
	xprt_free(xprt);
	return ERR_PTR(-EINVAL);
}
Esempio n. 6
0
/**
 * xprt_rdma_inject_disconnect - inject a connection fault
 * @xprt: transport context
 *
 * If @xprt is connected, disconnect it to simulate spurious connection
 * loss.
 */
static void
xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);

	trace_xprtrdma_inject_dsc(r_xprt);
	rdma_disconnect(r_xprt->rx_ia.ri_id);
}
Esempio n. 7
0
/*
 * Close a connection, during shutdown or timeout/reconnect
 */
static void
xprt_rdma_close(struct rpc_xprt *xprt)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);

	dprintk("RPC:       %s: closing\n", __func__);
	if (r_xprt->rx_ep.rep_connected > 0)
		xprt->reestablish_timeout = 0;
	xprt_disconnect_done(xprt);
	rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
}
Esempio n. 8
0
/**
 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
 * @task: RPC task
 *
 * Caller guarantees rqst->rq_buffer is non-NULL.
 */
static void
xprt_rdma_free(struct rpc_task *task)
{
	struct rpc_rqst *rqst = task->tk_rqstp;
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);

	if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
		rpcrdma_release_rqst(r_xprt, req);
	trace_xprtrdma_rpc_done(task, req);
}
Esempio n. 9
0
/**
 * xprt_rdma_send_request - marshal and send an RPC request
 * @rqst: RPC message in rq_snd_buf
 *
 * Caller holds the transport's write lock.
 *
 * Returns:
 *	%0 if the RPC message has been sent
 *	%-ENOTCONN if the caller should reconnect and call again
 *	%-EAGAIN if the caller should call again
 *	%-ENOBUFS if the caller should call again after a delay
 *	%-EIO if a permanent error occurred and the request was not
 *		sent. Do not try to send this message again.
 */
static int
xprt_rdma_send_request(struct rpc_rqst *rqst)
{
	struct rpc_xprt *xprt = rqst->rq_xprt;
	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	int rc = 0;

#if defined(CONFIG_SUNRPC_BACKCHANNEL)
	if (unlikely(!rqst->rq_buffer))
		return xprt_rdma_bc_send_reply(rqst);
#endif	/* CONFIG_SUNRPC_BACKCHANNEL */

	if (!xprt_connected(xprt))
		goto drop_connection;

	if (!xprt_request_get_cong(xprt, rqst))
		return -EBADSLT;

	rc = rpcrdma_marshal_req(r_xprt, rqst);
	if (rc < 0)
		goto failed_marshal;

	/* Must suppress retransmit to maintain credits */
	if (rqst->rq_connect_cookie == xprt->connect_cookie)
		goto drop_connection;
	rqst->rq_xtime = ktime_get();

	__set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
		goto drop_connection;

	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
	rqst->rq_bytes_sent = 0;

	/* An RPC with no reply will throw off credit accounting,
	 * so drop the connection to reset the credit grant.
	 */
	if (!rpc_reply_expected(rqst->rq_task))
		goto drop_connection;
	return 0;

failed_marshal:
	if (rc != -ENOTCONN)
		return rc;
drop_connection:
	xprt_disconnect_done(xprt);
	return -ENOTCONN;	/* implies disconnect */
}
Esempio n. 10
0
static int
xprt_rdma_send_request(struct rpc_task *task)
{
	struct rpc_rqst *rqst = task->tk_rqstp;
	struct rpc_xprt *xprt = rqst->rq_xprt;
	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	int rc = 0;

	if (req->rl_niovs == 0)
		rc = rpcrdma_marshal_req(rqst);
	else if (r_xprt->rx_ia.ri_memreg_strategy != RPCRDMA_ALLPHYSICAL)
		rc = rpcrdma_marshal_chunks(rqst, 0);
	if (rc < 0)
		goto failed_marshal;

	if (req->rl_reply == NULL) 		/* e.g. reconnection */
		rpcrdma_recv_buffer_get(req);

	if (req->rl_reply) {
		req->rl_reply->rr_func = rpcrdma_reply_handler;
		/* this need only be done once, but... */
		req->rl_reply->rr_xprt = xprt;
	}

	/* Must suppress retransmit to maintain credits */
	if (req->rl_connect_cookie == xprt->connect_cookie)
		goto drop_connection;
	req->rl_connect_cookie = xprt->connect_cookie;

	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
		goto drop_connection;

	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
	rqst->rq_bytes_sent = 0;
	return 0;

failed_marshal:
	r_xprt->rx_stats.failed_marshal_count++;
	dprintk("RPC:       %s: rpcrdma_marshal_req failed, status %i\n",
		__func__, rc);
	if (rc == -EIO)
		return -EIO;
drop_connection:
	xprt_disconnect_done(xprt);
	return -ENOTCONN;	/* implies disconnect */
}
Esempio n. 11
0
/**
 * xprt_rdma_alloc_slot - allocate an rpc_rqst
 * @xprt: controlling RPC transport
 * @task: RPC task requesting a fresh rpc_rqst
 *
 * tk_status values:
 *	%0 if task->tk_rqstp points to a fresh rpc_rqst
 *	%-EAGAIN if no rpc_rqst is available; queued on backlog
 */
static void
xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	struct rpcrdma_req *req;

	req = rpcrdma_buffer_get(&r_xprt->rx_buf);
	if (!req)
		goto out_sleep;
	task->tk_rqstp = &req->rl_slot;
	task->tk_status = 0;
	return;

out_sleep:
	rpc_sleep_on(&xprt->backlog, task, NULL);
	task->tk_status = -EAGAIN;
}
Esempio n. 12
0
/**
 * xprt_rdma_destroy - Full tear down of transport
 * @xprt: doomed transport context
 *
 * Caller guarantees there will be no more calls to us with
 * this @xprt.
 */
static void
xprt_rdma_destroy(struct rpc_xprt *xprt)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);

	trace_xprtrdma_destroy(r_xprt);

	cancel_delayed_work_sync(&r_xprt->rx_connect_worker);

	rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
	rpcrdma_buffer_destroy(&r_xprt->rx_buf);
	rpcrdma_ia_close(&r_xprt->rx_ia);

	xprt_rdma_free_addresses(xprt);
	xprt_free(xprt);

	module_put(THIS_MODULE);
}
Esempio n. 13
0
/**
 * xprt_rdma_connect - try to establish a transport connection
 * @xprt: transport state
 * @task: RPC scheduler context
 *
 */
static void
xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);

	if (r_xprt->rx_ep.rep_connected != 0) {
		/* Reconnect */
		schedule_delayed_work(&r_xprt->rx_connect_worker,
				      xprt->reestablish_timeout);
		xprt->reestablish_timeout <<= 1;
		if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
			xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
		else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
			xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
	} else {
		schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
		if (!RPC_IS_ASYNC(task))
			flush_delayed_work(&r_xprt->rx_connect_worker);
	}
}
Esempio n. 14
0
void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	long idle_time = 0;

	if (xprt_connected(xprt))
		idle_time = (long)(jiffies - xprt->last_used) / HZ;

	seq_puts(seq, "\txprt:\trdma ");
	seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
		   0,	/* need a local port? */
		   xprt->stat.bind_count,
		   xprt->stat.connect_count,
		   xprt->stat.connect_time / HZ,
		   idle_time,
		   xprt->stat.sends,
		   xprt->stat.recvs,
		   xprt->stat.bad_xids,
		   xprt->stat.req_u,
		   xprt->stat.bklog_u);
	seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
		   r_xprt->rx_stats.read_chunk_count,
		   r_xprt->rx_stats.write_chunk_count,
		   r_xprt->rx_stats.reply_chunk_count,
		   r_xprt->rx_stats.total_rdma_request,
		   r_xprt->rx_stats.total_rdma_reply,
		   r_xprt->rx_stats.pullup_copy_count,
		   r_xprt->rx_stats.fixup_copy_count,
		   r_xprt->rx_stats.hardway_register_count,
		   r_xprt->rx_stats.failed_marshal_count,
		   r_xprt->rx_stats.bad_reply_count,
		   r_xprt->rx_stats.nomsg_call_count);
	seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
		   r_xprt->rx_stats.mrs_recycled,
		   r_xprt->rx_stats.mrs_orphaned,
		   r_xprt->rx_stats.mrs_allocated,
		   r_xprt->rx_stats.local_inv_needed,
		   r_xprt->rx_stats.empty_sendctx_q,
		   r_xprt->rx_stats.reply_waits_for_send);
}
Esempio n. 15
0
static int
xprt_rdma_send_request(struct rpc_task *task)
{
	struct rpc_rqst *rqst = task->tk_rqstp;
	struct rpc_xprt *xprt = rqst->rq_xprt;
	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	int rc = 0;

	rc = rpcrdma_marshal_req(rqst);
	if (rc < 0)
		goto failed_marshal;

	if (req->rl_reply == NULL) 		/* e.g. reconnection */
		rpcrdma_recv_buffer_get(req);

	/* Must suppress retransmit to maintain credits */
	if (req->rl_connect_cookie == xprt->connect_cookie)
		goto drop_connection;
	req->rl_connect_cookie = xprt->connect_cookie;

	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
		goto drop_connection;

	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
	rqst->rq_bytes_sent = 0;
	return 0;

failed_marshal:
	r_xprt->rx_stats.failed_marshal_count++;
	dprintk("RPC:       %s: rpcrdma_marshal_req failed, status %i\n",
		__func__, rc);
	if (rc == -EIO)
		return -EIO;
drop_connection:
	xprt_disconnect_done(xprt);
	return -ENOTCONN;	/* implies disconnect */
}
Esempio n. 16
0
static int
rpcrdma_bc_send_request(struct svcxprt_rdma *rdma, struct rpc_rqst *rqst)
{
	struct rpc_xprt *xprt = rqst->rq_xprt;
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	struct svc_rdma_send_ctxt *ctxt;
	__be32 *p;
	int rc;

	ctxt = svc_rdma_send_ctxt_get(rdma);
	if (!ctxt)
		goto drop_connection;

	p = ctxt->sc_xprt_buf;
	*p++ = rqst->rq_xid;
	*p++ = rpcrdma_version;
	*p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
	*p++ = rdma_msg;
	*p++ = xdr_zero;
	*p++ = xdr_zero;
	*p   = xdr_zero;
	svc_rdma_sync_reply_hdr(rdma, ctxt, RPCRDMA_HDRLEN_MIN);

#ifdef SVCRDMA_BACKCHANNEL_DEBUG
	pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer);
#endif

	rc = svc_rdma_bc_sendto(rdma, rqst, ctxt);
	if (rc) {
		svc_rdma_send_ctxt_put(rdma, ctxt);
		goto drop_connection;
	}
	return 0;

drop_connection:
	dprintk("svcrdma: failed to send bc call\n");
	return -ENOTCONN;
}
Esempio n. 17
0
/*
 * xprt_rdma_destroy
 *
 * Destroy the xprt.
 * Free all memory associated with the object, including its own.
 * NOTE: none of the *destroy methods free memory for their top-level
 * objects, even though they may have allocated it (they do free
 * private memory). It's up to the caller to handle it. In this
 * case (RDMA transport), all structure memory is inlined with the
 * struct rpcrdma_xprt.
 */
static void
xprt_rdma_destroy(struct rpc_xprt *xprt)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);

	dprintk("RPC:       %s: called\n", __func__);

	cancel_delayed_work_sync(&r_xprt->rx_connect_worker);

	xprt_clear_connected(xprt);

	rpcrdma_buffer_destroy(&r_xprt->rx_buf);
	rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
	rpcrdma_ia_close(&r_xprt->rx_ia);

	xprt_rdma_free_addresses(xprt);

	xprt_free(xprt);

	dprintk("RPC:       %s: returning\n", __func__);

	module_put(THIS_MODULE);
}
Esempio n. 18
0
File: verbs.c Progetto: 274914765/C
static int
rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
{
    struct rpcrdma_xprt *xprt = id->context;
    struct rpcrdma_ia *ia = &xprt->rx_ia;
    struct rpcrdma_ep *ep = &xprt->rx_ep;
    struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr;
    struct ib_qp_attr attr;
    struct ib_qp_init_attr iattr;
    int connstate = 0;

    switch (event->event) {
    case RDMA_CM_EVENT_ADDR_RESOLVED:
    case RDMA_CM_EVENT_ROUTE_RESOLVED:
        complete(&ia->ri_done);
        break;
    case RDMA_CM_EVENT_ADDR_ERROR:
        ia->ri_async_rc = -EHOSTUNREACH;
        dprintk("RPC:       %s: CM address resolution error, ep 0x%p\n",
            __func__, ep);
        complete(&ia->ri_done);
        break;
    case RDMA_CM_EVENT_ROUTE_ERROR:
        ia->ri_async_rc = -ENETUNREACH;
        dprintk("RPC:       %s: CM route resolution error, ep 0x%p\n",
            __func__, ep);
        complete(&ia->ri_done);
        break;
    case RDMA_CM_EVENT_ESTABLISHED:
        connstate = 1;
        ib_query_qp(ia->ri_id->qp, &attr,
            IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
            &iattr);
        dprintk("RPC:       %s: %d responder resources"
            " (%d initiator)\n",
            __func__, attr.max_dest_rd_atomic, attr.max_rd_atomic);
        goto connected;
    case RDMA_CM_EVENT_CONNECT_ERROR:
        connstate = -ENOTCONN;
        goto connected;
    case RDMA_CM_EVENT_UNREACHABLE:
        connstate = -ENETDOWN;
        goto connected;
    case RDMA_CM_EVENT_REJECTED:
        connstate = -ECONNREFUSED;
        goto connected;
    case RDMA_CM_EVENT_DISCONNECTED:
        connstate = -ECONNABORTED;
        goto connected;
    case RDMA_CM_EVENT_DEVICE_REMOVAL:
        connstate = -ENODEV;
connected:
        dprintk("RPC:       %s: %s: %u.%u.%u.%u:%u"
            " (ep 0x%p event 0x%x)\n",
            __func__,
            (event->event <= 11) ? conn[event->event] :
                        "unknown connection error",
            NIPQUAD(addr->sin_addr.s_addr),
            ntohs(addr->sin_port),
            ep, event->event);
        atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1);
        dprintk("RPC:       %s: %sconnected\n",
                    __func__, connstate > 0 ? "" : "dis");
        ep->rep_connected = connstate;
        ep->rep_func(ep);
        wake_up_all(&ep->rep_connect_wait);
        break;
    default:
        ia->ri_async_rc = -EINVAL;
        dprintk("RPC:       %s: unexpected CM event %X\n",
            __func__, event->event);
        complete(&ia->ri_done);
        break;
    }

    return 0;
}
Esempio n. 19
0
/**
 * xprt_setup_rdma - Set up transport to use RDMA
 *
 * @args: rpc transport arguments
 */
static struct rpc_xprt *
xprt_setup_rdma(struct xprt_create *args)
{
	struct rpcrdma_create_data_internal cdata;
	struct rpc_xprt *xprt;
	struct rpcrdma_xprt *new_xprt;
	struct rpcrdma_ep *new_ep;
	struct sockaddr_in *sin;
	int rc;

	if (args->addrlen > sizeof(xprt->addr)) {
		dprintk("RPC:       %s: address too large\n", __func__);
		return ERR_PTR(-EBADF);
	}

	xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
			xprt_rdma_slot_table_entries,
			xprt_rdma_slot_table_entries);
	if (xprt == NULL) {
		dprintk("RPC:       %s: couldn't allocate rpcrdma_xprt\n",
			__func__);
		return ERR_PTR(-ENOMEM);
	}

	/* 60 second timeout, no retries */
	xprt->timeout = &xprt_rdma_default_timeout;
	xprt->bind_timeout = RPCRDMA_BIND_TO;
	xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
	xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;

	xprt->resvport = 0;		/* privileged port not needed */
	xprt->tsh_size = 0;		/* RPC-RDMA handles framing */
	xprt->ops = &xprt_rdma_procs;

	/*
	 * Set up RDMA-specific connect data.
	 */

	/* Put server RDMA address in local cdata */
	memcpy(&cdata.addr, args->dstaddr, args->addrlen);

	/* Ensure xprt->addr holds valid server TCP (not RDMA)
	 * address, for any side protocols which peek at it */
	xprt->prot = IPPROTO_TCP;
	xprt->addrlen = args->addrlen;
	memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);

	sin = (struct sockaddr_in *)&cdata.addr;
	if (ntohs(sin->sin_port) != 0)
		xprt_set_bound(xprt);

	dprintk("RPC:       %s: %pI4:%u\n",
		__func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));

	/* Set max requests */
	cdata.max_requests = xprt->max_reqs;

	/* Set some length limits */
	cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
	cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */

	cdata.inline_wsize = xprt_rdma_max_inline_write;
	if (cdata.inline_wsize > cdata.wsize)
		cdata.inline_wsize = cdata.wsize;

	cdata.inline_rsize = xprt_rdma_max_inline_read;
	if (cdata.inline_rsize > cdata.rsize)
		cdata.inline_rsize = cdata.rsize;

	cdata.padding = xprt_rdma_inline_write_padding;

	/*
	 * Create new transport instance, which includes initialized
	 *  o ia
	 *  o endpoint
	 *  o buffers
	 */

	new_xprt = rpcx_to_rdmax(xprt);

	rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
				xprt_rdma_memreg_strategy);
	if (rc)
		goto out1;

	/*
	 * initialize and create ep
	 */
	new_xprt->rx_data = cdata;
	new_ep = &new_xprt->rx_ep;
	new_ep->rep_remote_addr = cdata.addr;

	rc = rpcrdma_ep_create(&new_xprt->rx_ep,
				&new_xprt->rx_ia, &new_xprt->rx_data);
	if (rc)
		goto out2;

	/*
	 * Allocate pre-registered send and receive buffers for headers and
	 * any inline data. Also specify any padding which will be provided
	 * from a preregistered zero buffer.
	 */
	rc = rpcrdma_buffer_create(new_xprt);
	if (rc)
		goto out3;

	/*
	 * Register a callback for connection events. This is necessary because
	 * connection loss notification is async. We also catch connection loss
	 * when reaping receives.
	 */
	INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
			  xprt_rdma_connect_worker);

	xprt_rdma_format_addresses(xprt);
	xprt->max_payload = rpcrdma_max_payload(new_xprt);
	dprintk("RPC:       %s: transport data payload maximum: %zu bytes\n",
		__func__, xprt->max_payload);

	if (!try_module_get(THIS_MODULE))
		goto out4;

	return xprt;

out4:
	xprt_rdma_free_addresses(xprt);
	rc = -EINVAL;
out3:
	rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
out2:
	rpcrdma_ia_close(&new_xprt->rx_ia);
out1:
	xprt_free(xprt);
	return ERR_PTR(rc);
}
Esempio n. 20
0
/*
 * The RDMA allocate/free functions need the task structure as a place
 * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
 * sequence.
 *
 * The RPC layer allocates both send and receive buffers in the same call
 * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer).
 * We may register rq_rcv_buf when using reply chunks.
 */
static void *
xprt_rdma_allocate(struct rpc_task *task, size_t size)
{
	struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	struct rpcrdma_regbuf *rb;
	struct rpcrdma_req *req;
	size_t min_size;
	gfp_t flags;

	req = rpcrdma_buffer_get(&r_xprt->rx_buf);
	if (req == NULL)
		return NULL;

	flags = GFP_NOIO | __GFP_NOWARN;
	if (RPC_IS_SWAPPER(task))
		flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;

	if (req->rl_rdmabuf == NULL)
		goto out_rdmabuf;
	if (req->rl_sendbuf == NULL)
		goto out_sendbuf;
	if (size > req->rl_sendbuf->rg_size)
		goto out_sendbuf;

out:
	dprintk("RPC:       %s: size %zd, request 0x%p\n", __func__, size, req);
	req->rl_connect_cookie = 0;	/* our reserved value */
	return req->rl_sendbuf->rg_base;

out_rdmabuf:
	min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
	rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags);
	if (IS_ERR(rb))
		goto out_fail;
	req->rl_rdmabuf = rb;

out_sendbuf:
	/* XDR encoding and RPC/RDMA marshaling of this request has not
	 * yet occurred. Thus a lower bound is needed to prevent buffer
	 * overrun during marshaling.
	 *
	 * RPC/RDMA marshaling may choose to send payload bearing ops
	 * inline, if the result is smaller than the inline threshold.
	 * The value of the "size" argument accounts for header
	 * requirements but not for the payload in these cases.
	 *
	 * Likewise, allocate enough space to receive a reply up to the
	 * size of the inline threshold.
	 *
	 * It's unlikely that both the send header and the received
	 * reply will be large, but slush is provided here to allow
	 * flexibility when marshaling.
	 */
	min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp);
	min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
	if (size < min_size)
		size = min_size;

	rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags);
	if (IS_ERR(rb))
		goto out_fail;
	rb->rg_owner = req;

	r_xprt->rx_stats.hardway_register_count += size;
	rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf);
	req->rl_sendbuf = rb;
	goto out;

out_fail:
	rpcrdma_buffer_put(req);
	r_xprt->rx_stats.failed_marshal_count++;
	return NULL;
}
Esempio n. 21
0
int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, struct rpcrdma_msg *rmsgp,
			     struct xdr_buf *rcvbuf)
{
	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
	struct kvec *dst, *src = &rcvbuf->head[0];
	struct rpc_rqst *req;
	unsigned long cwnd;
	u32 credits;
	size_t len;
	__be32 xid;
	__be32 *p;
	int ret;

	p = (__be32 *)src->iov_base;
	len = src->iov_len;
	xid = rmsgp->rm_xid;

#ifdef SVCRDMA_BACKCHANNEL_DEBUG
	pr_info("%s: xid=%08x, length=%zu\n",
		__func__, be32_to_cpu(xid), len);
	pr_info("%s: RPC/RDMA: %*ph\n",
		__func__, (int)RPCRDMA_HDRLEN_MIN, rmsgp);
	pr_info("%s:      RPC: %*ph\n",
		__func__, (int)len, p);
#endif

	ret = -EAGAIN;
	if (src->iov_len < 24)
		goto out_shortreply;

	spin_lock_bh(&xprt->transport_lock);
	req = xprt_lookup_rqst(xprt, xid);
	if (!req)
		goto out_notfound;

	dst = &req->rq_private_buf.head[0];
	memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
	if (dst->iov_len < len)
		goto out_unlock;
	memcpy(dst->iov_base, p, len);

	credits = be32_to_cpu(rmsgp->rm_credit);
	if (credits == 0)
		credits = 1;	/* don't deadlock */
	else if (credits > r_xprt->rx_buf.rb_bc_max_requests)
		credits = r_xprt->rx_buf.rb_bc_max_requests;

	cwnd = xprt->cwnd;
	xprt->cwnd = credits << RPC_CWNDSHIFT;
	if (xprt->cwnd > cwnd)
		xprt_release_rqst_cong(req->rq_task);

	ret = 0;
	xprt_complete_rqst(req->rq_task, rcvbuf->len);
	rcvbuf->len = 0;

out_unlock:
	spin_unlock_bh(&xprt->transport_lock);
out:
	return ret;

out_shortreply:
	dprintk("svcrdma: short bc reply: xprt=%p, len=%zu\n",
		xprt, src->iov_len);
	goto out;

out_notfound:
	dprintk("svcrdma: unrecognized bc reply: xprt=%p, xid=%08x\n",
		xprt, be32_to_cpu(xid));

	goto out_unlock;
}
Esempio n. 22
0
/**
 * xprt_setup_rdma - Set up transport to use RDMA
 *
 * @args: rpc transport arguments
 */
static struct rpc_xprt *
xprt_setup_rdma(struct xprt_create *args)
{
	struct rpcrdma_create_data_internal cdata;
	struct rpc_xprt *xprt;
	struct rpcrdma_xprt *new_xprt;
	struct rpcrdma_ep *new_ep;
	struct sockaddr *sap;
	int rc;

	if (args->addrlen > sizeof(xprt->addr)) {
		dprintk("RPC:       %s: address too large\n", __func__);
		return ERR_PTR(-EBADF);
	}

	xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
	if (xprt == NULL) {
		dprintk("RPC:       %s: couldn't allocate rpcrdma_xprt\n",
			__func__);
		return ERR_PTR(-ENOMEM);
	}

	/* 60 second timeout, no retries */
	xprt->timeout = &xprt_rdma_default_timeout;
	xprt->bind_timeout = RPCRDMA_BIND_TO;
	xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
	xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;

	xprt->resvport = 0;		/* privileged port not needed */
	xprt->tsh_size = 0;		/* RPC-RDMA handles framing */
	xprt->ops = &xprt_rdma_procs;

	/*
	 * Set up RDMA-specific connect data.
	 */
	sap = args->dstaddr;

	/* Ensure xprt->addr holds valid server TCP (not RDMA)
	 * address, for any side protocols which peek at it */
	xprt->prot = IPPROTO_TCP;
	xprt->addrlen = args->addrlen;
	memcpy(&xprt->addr, sap, xprt->addrlen);

	if (rpc_get_port(sap))
		xprt_set_bound(xprt);
	xprt_rdma_format_addresses(xprt, sap);

	cdata.max_requests = xprt_rdma_slot_table_entries;

	cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
	cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */

	cdata.inline_wsize = xprt_rdma_max_inline_write;
	if (cdata.inline_wsize > cdata.wsize)
		cdata.inline_wsize = cdata.wsize;

	cdata.inline_rsize = xprt_rdma_max_inline_read;
	if (cdata.inline_rsize > cdata.rsize)
		cdata.inline_rsize = cdata.rsize;

	/*
	 * Create new transport instance, which includes initialized
	 *  o ia
	 *  o endpoint
	 *  o buffers
	 */

	new_xprt = rpcx_to_rdmax(xprt);

	rc = rpcrdma_ia_open(new_xprt);
	if (rc)
		goto out1;

	/*
	 * initialize and create ep
	 */
	new_xprt->rx_data = cdata;
	new_ep = &new_xprt->rx_ep;

	rc = rpcrdma_ep_create(&new_xprt->rx_ep,
				&new_xprt->rx_ia, &new_xprt->rx_data);
	if (rc)
		goto out2;

	rc = rpcrdma_buffer_create(new_xprt);
	if (rc)
		goto out3;

	INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
			  xprt_rdma_connect_worker);

	xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
	if (xprt->max_payload == 0)
		goto out4;
	xprt->max_payload <<= PAGE_SHIFT;
	dprintk("RPC:       %s: transport data payload maximum: %zu bytes\n",
		__func__, xprt->max_payload);

	if (!try_module_get(THIS_MODULE))
		goto out4;

	dprintk("RPC:       %s: %s:%s\n", __func__,
		xprt->address_strings[RPC_DISPLAY_ADDR],
		xprt->address_strings[RPC_DISPLAY_PORT]);
	trace_xprtrdma_create(new_xprt);
	return xprt;

out4:
	rpcrdma_buffer_destroy(&new_xprt->rx_buf);
	rc = -ENODEV;
out3:
	rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
out2:
	rpcrdma_ia_close(&new_xprt->rx_ia);
out1:
	trace_xprtrdma_destroy(new_xprt);
	xprt_rdma_free_addresses(xprt);
	xprt_free(xprt);
	return ERR_PTR(rc);
}
Esempio n. 23
0
static int
rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
{
	struct rpcrdma_xprt *xprt = id->context;
	struct rpcrdma_ia *ia = &xprt->rx_ia;
	struct rpcrdma_ep *ep = &xprt->rx_ep;
#ifdef RPC_DEBUG
	struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr;
#endif
	struct ib_qp_attr attr;
	struct ib_qp_init_attr iattr;
	int connstate = 0;

	switch (event->event) {
	case RDMA_CM_EVENT_ADDR_RESOLVED:
	case RDMA_CM_EVENT_ROUTE_RESOLVED:
		ia->ri_async_rc = 0;
		complete(&ia->ri_done);
		break;
	case RDMA_CM_EVENT_ADDR_ERROR:
		ia->ri_async_rc = -EHOSTUNREACH;
		dprintk("RPC:       %s: CM address resolution error, ep 0x%p\n",
			__func__, ep);
		complete(&ia->ri_done);
		break;
	case RDMA_CM_EVENT_ROUTE_ERROR:
		ia->ri_async_rc = -ENETUNREACH;
		dprintk("RPC:       %s: CM route resolution error, ep 0x%p\n",
			__func__, ep);
		complete(&ia->ri_done);
		break;
	case RDMA_CM_EVENT_ESTABLISHED:
		connstate = 1;
		ib_query_qp(ia->ri_id->qp, &attr,
			IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
			&iattr);
		dprintk("RPC:       %s: %d responder resources"
			" (%d initiator)\n",
			__func__, attr.max_dest_rd_atomic, attr.max_rd_atomic);
		goto connected;
	case RDMA_CM_EVENT_CONNECT_ERROR:
		connstate = -ENOTCONN;
		goto connected;
	case RDMA_CM_EVENT_UNREACHABLE:
		connstate = -ENETDOWN;
		goto connected;
	case RDMA_CM_EVENT_REJECTED:
		connstate = -ECONNREFUSED;
		goto connected;
	case RDMA_CM_EVENT_DISCONNECTED:
		connstate = -ECONNABORTED;
		goto connected;
	case RDMA_CM_EVENT_DEVICE_REMOVAL:
		connstate = -ENODEV;
connected:
		dprintk("RPC:       %s: %s: %pI4:%u (ep 0x%p event 0x%x)\n",
			__func__,
			(event->event <= 11) ? conn[event->event] :
						"unknown connection error",
			&addr->sin_addr.s_addr,
			ntohs(addr->sin_port),
			ep, event->event);
		atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1);
		dprintk("RPC:       %s: %sconnected\n",
					__func__, connstate > 0 ? "" : "dis");
		ep->rep_connected = connstate;
		ep->rep_func(ep);
		wake_up_all(&ep->rep_connect_wait);
		break;
	default:
		dprintk("RPC:       %s: unexpected CM event %d\n",
			__func__, event->event);
		break;
	}

#ifdef RPC_DEBUG
	if (connstate == 1) {
		int ird = attr.max_dest_rd_atomic;
		int tird = ep->rep_remote_cma.responder_resources;
		printk(KERN_INFO "rpcrdma: connection to %pI4:%u "
			"on %s, memreg %d slots %d ird %d%s\n",
			&addr->sin_addr.s_addr,
			ntohs(addr->sin_port),
			ia->ri_id->device->name,
			ia->ri_memreg_strategy,
			xprt->rx_buf.rb_max_requests,
			ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
	} else if (connstate < 0) {
		printk(KERN_INFO "rpcrdma: connection to %pI4:%u closed (%d)\n",
			&addr->sin_addr.s_addr,
			ntohs(addr->sin_port),
			connstate);
	}
#endif

	return 0;
}