![Neil Horman](/assets/img/avatar_default.png)
Recently had this bug halt reported to me: kernel BUG at net/rds/send.c:329! Oops: Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=1024 NUMA pSeries Modules linked in: rds sunrpc ipv6 dm_mirror dm_region_hash dm_log ibmveth sg ext4 jbd2 mbcache sd_mod crc_t10dif ibmvscsic scsi_transport_srp scsi_tgt dm_mod [last unloaded: scsi_wait_scan] NIP: d000000003ca68f4 LR: d000000003ca67fc CTR: d000000003ca8770 REGS: c000000175cab980 TRAP: 0700 Not tainted (2.6.32-118.el6.ppc64) MSR: 8000000000029032 <EE,ME,CE,IR,DR> CR: 44000022 XER: 00000000 TASK = c00000017586ec90[1896] 'krdsd' THREAD: c000000175ca8000 CPU: 0 GPR00: 0000000000000150 c000000175cabc00 d000000003cb7340 0000000000002030 GPR04: ffffffffffffffff 0000000000000030 0000000000000000 0000000000000030 GPR08: 0000000000000001 0000000000000001 c0000001756b1e30 0000000000010000 GPR12: d000000003caac90 c000000000fa2500 c0000001742b2858 c0000001742b2a00 GPR16: c0000001742b2a08 c0000001742b2820 0000000000000001 0000000000000001 GPR20: 0000000000000040 c0000001742b2814 c000000175cabc70 0800000000000000 GPR24: 0000000000000004 0200000000000000 0000000000000000 c0000001742b2860 GPR28: 0000000000000000 c0000001756b1c80 d000000003cb68e8 c0000001742b27b8 NIP [d000000003ca68f4] .rds_send_xmit+0x4c4/0x8a0 [rds] LR [d000000003ca67fc] .rds_send_xmit+0x3cc/0x8a0 [rds] Call Trace: [c000000175cabc00] [d000000003ca67fc] .rds_send_xmit+0x3cc/0x8a0 [rds] (unreliable) [c000000175cabd30] [d000000003ca7e64] .rds_send_worker+0x54/0x100 [rds] [c000000175cabdb0] [c0000000000b475c] .worker_thread+0x1dc/0x3c0 [c000000175cabed0] [c0000000000baa9c] .kthread+0xbc/0xd0 [c000000175cabf90] [c000000000032114] .kernel_thread+0x54/0x70 Instruction dump: 4bfffd50 60000000 60000000 39080001 935f004c f91f0040 41820024 813d017c 7d094a78 7d290074 7929d182 394a0020 <0b090000> 40e2ff68 4bffffa4 39200000 Kernel panic - not syncing: Fatal exception Call Trace: [c000000175cab560] [c000000000012e04] .show_stack+0x74/0x1c0 (unreliable) [c000000175cab610] [c0000000005a365c] .panic+0x80/0x1b4 [c000000175cab6a0] [c00000000002fbcc] .die+0x21c/0x2a0 [c000000175cab750] [c000000000030000] ._exception+0x110/0x220 [c000000175cab910] [c000000000004b9c] program_check_common+0x11c/0x180 Signed-off-by: David S. Miller <davem@davemloft.net>
1022 lines
30 KiB
C
1022 lines
30 KiB
C
/*
|
|
* Copyright (c) 2006 Oracle. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/in.h>
|
|
#include <linux/device.h>
|
|
#include <linux/dmapool.h>
|
|
|
|
#include "rds.h"
|
|
#include "ib.h"
|
|
|
|
static char *rds_ib_wc_status_strings[] = {
|
|
#define RDS_IB_WC_STATUS_STR(foo) \
|
|
[IB_WC_##foo] = __stringify(IB_WC_##foo)
|
|
RDS_IB_WC_STATUS_STR(SUCCESS),
|
|
RDS_IB_WC_STATUS_STR(LOC_LEN_ERR),
|
|
RDS_IB_WC_STATUS_STR(LOC_QP_OP_ERR),
|
|
RDS_IB_WC_STATUS_STR(LOC_EEC_OP_ERR),
|
|
RDS_IB_WC_STATUS_STR(LOC_PROT_ERR),
|
|
RDS_IB_WC_STATUS_STR(WR_FLUSH_ERR),
|
|
RDS_IB_WC_STATUS_STR(MW_BIND_ERR),
|
|
RDS_IB_WC_STATUS_STR(BAD_RESP_ERR),
|
|
RDS_IB_WC_STATUS_STR(LOC_ACCESS_ERR),
|
|
RDS_IB_WC_STATUS_STR(REM_INV_REQ_ERR),
|
|
RDS_IB_WC_STATUS_STR(REM_ACCESS_ERR),
|
|
RDS_IB_WC_STATUS_STR(REM_OP_ERR),
|
|
RDS_IB_WC_STATUS_STR(RETRY_EXC_ERR),
|
|
RDS_IB_WC_STATUS_STR(RNR_RETRY_EXC_ERR),
|
|
RDS_IB_WC_STATUS_STR(LOC_RDD_VIOL_ERR),
|
|
RDS_IB_WC_STATUS_STR(REM_INV_RD_REQ_ERR),
|
|
RDS_IB_WC_STATUS_STR(REM_ABORT_ERR),
|
|
RDS_IB_WC_STATUS_STR(INV_EECN_ERR),
|
|
RDS_IB_WC_STATUS_STR(INV_EEC_STATE_ERR),
|
|
RDS_IB_WC_STATUS_STR(FATAL_ERR),
|
|
RDS_IB_WC_STATUS_STR(RESP_TIMEOUT_ERR),
|
|
RDS_IB_WC_STATUS_STR(GENERAL_ERR),
|
|
#undef RDS_IB_WC_STATUS_STR
|
|
};
|
|
|
|
char *rds_ib_wc_status_str(enum ib_wc_status status)
|
|
{
|
|
return rds_str_array(rds_ib_wc_status_strings,
|
|
ARRAY_SIZE(rds_ib_wc_status_strings), status);
|
|
}
|
|
|
|
/*
|
|
* Convert IB-specific error message to RDS error message and call core
|
|
* completion handler.
|
|
*/
|
|
static void rds_ib_send_complete(struct rds_message *rm,
|
|
int wc_status,
|
|
void (*complete)(struct rds_message *rm, int status))
|
|
{
|
|
int notify_status;
|
|
|
|
switch (wc_status) {
|
|
case IB_WC_WR_FLUSH_ERR:
|
|
return;
|
|
|
|
case IB_WC_SUCCESS:
|
|
notify_status = RDS_RDMA_SUCCESS;
|
|
break;
|
|
|
|
case IB_WC_REM_ACCESS_ERR:
|
|
notify_status = RDS_RDMA_REMOTE_ERROR;
|
|
break;
|
|
|
|
default:
|
|
notify_status = RDS_RDMA_OTHER_ERROR;
|
|
break;
|
|
}
|
|
complete(rm, notify_status);
|
|
}
|
|
|
|
static void rds_ib_send_unmap_data(struct rds_ib_connection *ic,
|
|
struct rm_data_op *op,
|
|
int wc_status)
|
|
{
|
|
if (op->op_nents)
|
|
ib_dma_unmap_sg(ic->i_cm_id->device,
|
|
op->op_sg, op->op_nents,
|
|
DMA_TO_DEVICE);
|
|
}
|
|
|
|
static void rds_ib_send_unmap_rdma(struct rds_ib_connection *ic,
|
|
struct rm_rdma_op *op,
|
|
int wc_status)
|
|
{
|
|
if (op->op_mapped) {
|
|
ib_dma_unmap_sg(ic->i_cm_id->device,
|
|
op->op_sg, op->op_nents,
|
|
op->op_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
op->op_mapped = 0;
|
|
}
|
|
|
|
/* If the user asked for a completion notification on this
|
|
* message, we can implement three different semantics:
|
|
* 1. Notify when we received the ACK on the RDS message
|
|
* that was queued with the RDMA. This provides reliable
|
|
* notification of RDMA status at the expense of a one-way
|
|
* packet delay.
|
|
* 2. Notify when the IB stack gives us the completion event for
|
|
* the RDMA operation.
|
|
* 3. Notify when the IB stack gives us the completion event for
|
|
* the accompanying RDS messages.
|
|
* Here, we implement approach #3. To implement approach #2,
|
|
* we would need to take an event for the rdma WR. To implement #1,
|
|
* don't call rds_rdma_send_complete at all, and fall back to the notify
|
|
* handling in the ACK processing code.
|
|
*
|
|
* Note: There's no need to explicitly sync any RDMA buffers using
|
|
* ib_dma_sync_sg_for_cpu - the completion for the RDMA
|
|
* operation itself unmapped the RDMA buffers, which takes care
|
|
* of synching.
|
|
*/
|
|
rds_ib_send_complete(container_of(op, struct rds_message, rdma),
|
|
wc_status, rds_rdma_send_complete);
|
|
|
|
if (op->op_write)
|
|
rds_stats_add(s_send_rdma_bytes, op->op_bytes);
|
|
else
|
|
rds_stats_add(s_recv_rdma_bytes, op->op_bytes);
|
|
}
|
|
|
|
static void rds_ib_send_unmap_atomic(struct rds_ib_connection *ic,
|
|
struct rm_atomic_op *op,
|
|
int wc_status)
|
|
{
|
|
/* unmap atomic recvbuf */
|
|
if (op->op_mapped) {
|
|
ib_dma_unmap_sg(ic->i_cm_id->device, op->op_sg, 1,
|
|
DMA_FROM_DEVICE);
|
|
op->op_mapped = 0;
|
|
}
|
|
|
|
rds_ib_send_complete(container_of(op, struct rds_message, atomic),
|
|
wc_status, rds_atomic_send_complete);
|
|
|
|
if (op->op_type == RDS_ATOMIC_TYPE_CSWP)
|
|
rds_ib_stats_inc(s_ib_atomic_cswp);
|
|
else
|
|
rds_ib_stats_inc(s_ib_atomic_fadd);
|
|
}
|
|
|
|
/*
|
|
* Unmap the resources associated with a struct send_work.
|
|
*
|
|
* Returns the rm for no good reason other than it is unobtainable
|
|
* other than by switching on wr.opcode, currently, and the caller,
|
|
* the event handler, needs it.
|
|
*/
|
|
static struct rds_message *rds_ib_send_unmap_op(struct rds_ib_connection *ic,
|
|
struct rds_ib_send_work *send,
|
|
int wc_status)
|
|
{
|
|
struct rds_message *rm = NULL;
|
|
|
|
/* In the error case, wc.opcode sometimes contains garbage */
|
|
switch (send->s_wr.opcode) {
|
|
case IB_WR_SEND:
|
|
if (send->s_op) {
|
|
rm = container_of(send->s_op, struct rds_message, data);
|
|
rds_ib_send_unmap_data(ic, send->s_op, wc_status);
|
|
}
|
|
break;
|
|
case IB_WR_RDMA_WRITE:
|
|
case IB_WR_RDMA_READ:
|
|
if (send->s_op) {
|
|
rm = container_of(send->s_op, struct rds_message, rdma);
|
|
rds_ib_send_unmap_rdma(ic, send->s_op, wc_status);
|
|
}
|
|
break;
|
|
case IB_WR_ATOMIC_FETCH_AND_ADD:
|
|
case IB_WR_ATOMIC_CMP_AND_SWP:
|
|
if (send->s_op) {
|
|
rm = container_of(send->s_op, struct rds_message, atomic);
|
|
rds_ib_send_unmap_atomic(ic, send->s_op, wc_status);
|
|
}
|
|
break;
|
|
default:
|
|
if (printk_ratelimit())
|
|
printk(KERN_NOTICE
|
|
"RDS/IB: %s: unexpected opcode 0x%x in WR!\n",
|
|
__func__, send->s_wr.opcode);
|
|
break;
|
|
}
|
|
|
|
send->s_wr.opcode = 0xdead;
|
|
|
|
return rm;
|
|
}
|
|
|
|
void rds_ib_send_init_ring(struct rds_ib_connection *ic)
|
|
{
|
|
struct rds_ib_send_work *send;
|
|
u32 i;
|
|
|
|
for (i = 0, send = ic->i_sends; i < ic->i_send_ring.w_nr; i++, send++) {
|
|
struct ib_sge *sge;
|
|
|
|
send->s_op = NULL;
|
|
|
|
send->s_wr.wr_id = i;
|
|
send->s_wr.sg_list = send->s_sge;
|
|
send->s_wr.ex.imm_data = 0;
|
|
|
|
sge = &send->s_sge[0];
|
|
sge->addr = ic->i_send_hdrs_dma + (i * sizeof(struct rds_header));
|
|
sge->length = sizeof(struct rds_header);
|
|
sge->lkey = ic->i_mr->lkey;
|
|
|
|
send->s_sge[1].lkey = ic->i_mr->lkey;
|
|
}
|
|
}
|
|
|
|
void rds_ib_send_clear_ring(struct rds_ib_connection *ic)
|
|
{
|
|
struct rds_ib_send_work *send;
|
|
u32 i;
|
|
|
|
for (i = 0, send = ic->i_sends; i < ic->i_send_ring.w_nr; i++, send++) {
|
|
if (send->s_op && send->s_wr.opcode != 0xdead)
|
|
rds_ib_send_unmap_op(ic, send, IB_WC_WR_FLUSH_ERR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The only fast path caller always has a non-zero nr, so we don't
|
|
* bother testing nr before performing the atomic sub.
|
|
*/
|
|
static void rds_ib_sub_signaled(struct rds_ib_connection *ic, int nr)
|
|
{
|
|
if ((atomic_sub_return(nr, &ic->i_signaled_sends) == 0) &&
|
|
waitqueue_active(&rds_ib_ring_empty_wait))
|
|
wake_up(&rds_ib_ring_empty_wait);
|
|
BUG_ON(atomic_read(&ic->i_signaled_sends) < 0);
|
|
}
|
|
|
|
/*
|
|
* The _oldest/_free ring operations here race cleanly with the alloc/unalloc
|
|
* operations performed in the send path. As the sender allocs and potentially
|
|
* unallocs the next free entry in the ring it doesn't alter which is
|
|
* the next to be freed, which is what this is concerned with.
|
|
*/
|
|
void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context)
|
|
{
|
|
struct rds_connection *conn = context;
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct rds_message *rm = NULL;
|
|
struct ib_wc wc;
|
|
struct rds_ib_send_work *send;
|
|
u32 completed;
|
|
u32 oldest;
|
|
u32 i = 0;
|
|
int ret;
|
|
int nr_sig = 0;
|
|
|
|
rdsdebug("cq %p conn %p\n", cq, conn);
|
|
rds_ib_stats_inc(s_ib_tx_cq_call);
|
|
ret = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
|
|
if (ret)
|
|
rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
|
|
|
|
while (ib_poll_cq(cq, 1, &wc) > 0) {
|
|
rdsdebug("wc wr_id 0x%llx status %u (%s) byte_len %u imm_data %u\n",
|
|
(unsigned long long)wc.wr_id, wc.status,
|
|
rds_ib_wc_status_str(wc.status), wc.byte_len,
|
|
be32_to_cpu(wc.ex.imm_data));
|
|
rds_ib_stats_inc(s_ib_tx_cq_event);
|
|
|
|
if (wc.wr_id == RDS_IB_ACK_WR_ID) {
|
|
if (ic->i_ack_queued + HZ/2 < jiffies)
|
|
rds_ib_stats_inc(s_ib_tx_stalled);
|
|
rds_ib_ack_send_complete(ic);
|
|
continue;
|
|
}
|
|
|
|
oldest = rds_ib_ring_oldest(&ic->i_send_ring);
|
|
|
|
completed = rds_ib_ring_completed(&ic->i_send_ring, wc.wr_id, oldest);
|
|
|
|
for (i = 0; i < completed; i++) {
|
|
send = &ic->i_sends[oldest];
|
|
if (send->s_wr.send_flags & IB_SEND_SIGNALED)
|
|
nr_sig++;
|
|
|
|
rm = rds_ib_send_unmap_op(ic, send, wc.status);
|
|
|
|
if (send->s_queued + HZ/2 < jiffies)
|
|
rds_ib_stats_inc(s_ib_tx_stalled);
|
|
|
|
if (send->s_op) {
|
|
if (send->s_op == rm->m_final_op) {
|
|
/* If anyone waited for this message to get flushed out, wake
|
|
* them up now */
|
|
rds_message_unmapped(rm);
|
|
}
|
|
rds_message_put(rm);
|
|
send->s_op = NULL;
|
|
}
|
|
|
|
oldest = (oldest + 1) % ic->i_send_ring.w_nr;
|
|
}
|
|
|
|
rds_ib_ring_free(&ic->i_send_ring, completed);
|
|
rds_ib_sub_signaled(ic, nr_sig);
|
|
nr_sig = 0;
|
|
|
|
if (test_and_clear_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
|
|
test_bit(0, &conn->c_map_queued))
|
|
queue_delayed_work(rds_wq, &conn->c_send_w, 0);
|
|
|
|
/* We expect errors as the qp is drained during shutdown */
|
|
if (wc.status != IB_WC_SUCCESS && rds_conn_up(conn)) {
|
|
rds_ib_conn_error(conn, "send completion on %pI4 had status "
|
|
"%u (%s), disconnecting and reconnecting\n",
|
|
&conn->c_faddr, wc.status,
|
|
rds_ib_wc_status_str(wc.status));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the main function for allocating credits when sending
|
|
* messages.
|
|
*
|
|
* Conceptually, we have two counters:
|
|
* - send credits: this tells us how many WRs we're allowed
|
|
* to submit without overruning the reciever's queue. For
|
|
* each SEND WR we post, we decrement this by one.
|
|
*
|
|
* - posted credits: this tells us how many WRs we recently
|
|
* posted to the receive queue. This value is transferred
|
|
* to the peer as a "credit update" in a RDS header field.
|
|
* Every time we transmit credits to the peer, we subtract
|
|
* the amount of transferred credits from this counter.
|
|
*
|
|
* It is essential that we avoid situations where both sides have
|
|
* exhausted their send credits, and are unable to send new credits
|
|
* to the peer. We achieve this by requiring that we send at least
|
|
* one credit update to the peer before exhausting our credits.
|
|
* When new credits arrive, we subtract one credit that is withheld
|
|
* until we've posted new buffers and are ready to transmit these
|
|
* credits (see rds_ib_send_add_credits below).
|
|
*
|
|
* The RDS send code is essentially single-threaded; rds_send_xmit
|
|
* sets RDS_IN_XMIT to ensure exclusive access to the send ring.
|
|
* However, the ACK sending code is independent and can race with
|
|
* message SENDs.
|
|
*
|
|
* In the send path, we need to update the counters for send credits
|
|
* and the counter of posted buffers atomically - when we use the
|
|
* last available credit, we cannot allow another thread to race us
|
|
* and grab the posted credits counter. Hence, we have to use a
|
|
* spinlock to protect the credit counter, or use atomics.
|
|
*
|
|
* Spinlocks shared between the send and the receive path are bad,
|
|
* because they create unnecessary delays. An early implementation
|
|
* using a spinlock showed a 5% degradation in throughput at some
|
|
* loads.
|
|
*
|
|
* This implementation avoids spinlocks completely, putting both
|
|
* counters into a single atomic, and updating that atomic using
|
|
* atomic_add (in the receive path, when receiving fresh credits),
|
|
* and using atomic_cmpxchg when updating the two counters.
|
|
*/
|
|
int rds_ib_send_grab_credits(struct rds_ib_connection *ic,
|
|
u32 wanted, u32 *adv_credits, int need_posted, int max_posted)
|
|
{
|
|
unsigned int avail, posted, got = 0, advertise;
|
|
long oldval, newval;
|
|
|
|
*adv_credits = 0;
|
|
if (!ic->i_flowctl)
|
|
return wanted;
|
|
|
|
try_again:
|
|
advertise = 0;
|
|
oldval = newval = atomic_read(&ic->i_credits);
|
|
posted = IB_GET_POST_CREDITS(oldval);
|
|
avail = IB_GET_SEND_CREDITS(oldval);
|
|
|
|
rdsdebug("rds_ib_send_grab_credits(%u): credits=%u posted=%u\n",
|
|
wanted, avail, posted);
|
|
|
|
/* The last credit must be used to send a credit update. */
|
|
if (avail && !posted)
|
|
avail--;
|
|
|
|
if (avail < wanted) {
|
|
struct rds_connection *conn = ic->i_cm_id->context;
|
|
|
|
/* Oops, there aren't that many credits left! */
|
|
set_bit(RDS_LL_SEND_FULL, &conn->c_flags);
|
|
got = avail;
|
|
} else {
|
|
/* Sometimes you get what you want, lalala. */
|
|
got = wanted;
|
|
}
|
|
newval -= IB_SET_SEND_CREDITS(got);
|
|
|
|
/*
|
|
* If need_posted is non-zero, then the caller wants
|
|
* the posted regardless of whether any send credits are
|
|
* available.
|
|
*/
|
|
if (posted && (got || need_posted)) {
|
|
advertise = min_t(unsigned int, posted, max_posted);
|
|
newval -= IB_SET_POST_CREDITS(advertise);
|
|
}
|
|
|
|
/* Finally bill everything */
|
|
if (atomic_cmpxchg(&ic->i_credits, oldval, newval) != oldval)
|
|
goto try_again;
|
|
|
|
*adv_credits = advertise;
|
|
return got;
|
|
}
|
|
|
|
void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
|
|
if (credits == 0)
|
|
return;
|
|
|
|
rdsdebug("rds_ib_send_add_credits(%u): current=%u%s\n",
|
|
credits,
|
|
IB_GET_SEND_CREDITS(atomic_read(&ic->i_credits)),
|
|
test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ? ", ll_send_full" : "");
|
|
|
|
atomic_add(IB_SET_SEND_CREDITS(credits), &ic->i_credits);
|
|
if (test_and_clear_bit(RDS_LL_SEND_FULL, &conn->c_flags))
|
|
queue_delayed_work(rds_wq, &conn->c_send_w, 0);
|
|
|
|
WARN_ON(IB_GET_SEND_CREDITS(credits) >= 16384);
|
|
|
|
rds_ib_stats_inc(s_ib_rx_credit_updates);
|
|
}
|
|
|
|
void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
|
|
if (posted == 0)
|
|
return;
|
|
|
|
atomic_add(IB_SET_POST_CREDITS(posted), &ic->i_credits);
|
|
|
|
/* Decide whether to send an update to the peer now.
|
|
* If we would send a credit update for every single buffer we
|
|
* post, we would end up with an ACK storm (ACK arrives,
|
|
* consumes buffer, we refill the ring, send ACK to remote
|
|
* advertising the newly posted buffer... ad inf)
|
|
*
|
|
* Performance pretty much depends on how often we send
|
|
* credit updates - too frequent updates mean lots of ACKs.
|
|
* Too infrequent updates, and the peer will run out of
|
|
* credits and has to throttle.
|
|
* For the time being, 16 seems to be a good compromise.
|
|
*/
|
|
if (IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)) >= 16)
|
|
set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
|
|
}
|
|
|
|
static inline int rds_ib_set_wr_signal_state(struct rds_ib_connection *ic,
|
|
struct rds_ib_send_work *send,
|
|
bool notify)
|
|
{
|
|
/*
|
|
* We want to delay signaling completions just enough to get
|
|
* the batching benefits but not so much that we create dead time
|
|
* on the wire.
|
|
*/
|
|
if (ic->i_unsignaled_wrs-- == 0 || notify) {
|
|
ic->i_unsignaled_wrs = rds_ib_sysctl_max_unsig_wrs;
|
|
send->s_wr.send_flags |= IB_SEND_SIGNALED;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This can be called multiple times for a given message. The first time
|
|
* we see a message we map its scatterlist into the IB device so that
|
|
* we can provide that mapped address to the IB scatter gather entries
|
|
* in the IB work requests. We translate the scatterlist into a series
|
|
* of work requests that fragment the message. These work requests complete
|
|
* in order so we pass ownership of the message to the completion handler
|
|
* once we send the final fragment.
|
|
*
|
|
* The RDS core uses the c_send_lock to only enter this function once
|
|
* per connection. This makes sure that the tx ring alloc/unalloc pairs
|
|
* don't get out of sync and confuse the ring.
|
|
*/
|
|
int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
|
|
unsigned int hdr_off, unsigned int sg, unsigned int off)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct ib_device *dev = ic->i_cm_id->device;
|
|
struct rds_ib_send_work *send = NULL;
|
|
struct rds_ib_send_work *first;
|
|
struct rds_ib_send_work *prev;
|
|
struct ib_send_wr *failed_wr;
|
|
struct scatterlist *scat;
|
|
u32 pos;
|
|
u32 i;
|
|
u32 work_alloc;
|
|
u32 credit_alloc = 0;
|
|
u32 posted;
|
|
u32 adv_credits = 0;
|
|
int send_flags = 0;
|
|
int bytes_sent = 0;
|
|
int ret;
|
|
int flow_controlled = 0;
|
|
int nr_sig = 0;
|
|
|
|
BUG_ON(off % RDS_FRAG_SIZE);
|
|
BUG_ON(hdr_off != 0 && hdr_off != sizeof(struct rds_header));
|
|
|
|
/* Do not send cong updates to IB loopback */
|
|
if (conn->c_loopback
|
|
&& rm->m_inc.i_hdr.h_flags & RDS_FLAG_CONG_BITMAP) {
|
|
rds_cong_map_updated(conn->c_fcong, ~(u64) 0);
|
|
scat = &rm->data.op_sg[sg];
|
|
ret = sizeof(struct rds_header) + RDS_CONG_MAP_BYTES;
|
|
ret = min_t(int, ret, scat->length - conn->c_xmit_data_off);
|
|
return ret;
|
|
}
|
|
|
|
/* FIXME we may overallocate here */
|
|
if (be32_to_cpu(rm->m_inc.i_hdr.h_len) == 0)
|
|
i = 1;
|
|
else
|
|
i = ceil(be32_to_cpu(rm->m_inc.i_hdr.h_len), RDS_FRAG_SIZE);
|
|
|
|
work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, i, &pos);
|
|
if (work_alloc == 0) {
|
|
set_bit(RDS_LL_SEND_FULL, &conn->c_flags);
|
|
rds_ib_stats_inc(s_ib_tx_ring_full);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (ic->i_flowctl) {
|
|
credit_alloc = rds_ib_send_grab_credits(ic, work_alloc, &posted, 0, RDS_MAX_ADV_CREDIT);
|
|
adv_credits += posted;
|
|
if (credit_alloc < work_alloc) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc - credit_alloc);
|
|
work_alloc = credit_alloc;
|
|
flow_controlled = 1;
|
|
}
|
|
if (work_alloc == 0) {
|
|
set_bit(RDS_LL_SEND_FULL, &conn->c_flags);
|
|
rds_ib_stats_inc(s_ib_tx_throttle);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* map the message the first time we see it */
|
|
if (!ic->i_data_op) {
|
|
if (rm->data.op_nents) {
|
|
rm->data.op_count = ib_dma_map_sg(dev,
|
|
rm->data.op_sg,
|
|
rm->data.op_nents,
|
|
DMA_TO_DEVICE);
|
|
rdsdebug("ic %p mapping rm %p: %d\n", ic, rm, rm->data.op_count);
|
|
if (rm->data.op_count == 0) {
|
|
rds_ib_stats_inc(s_ib_tx_sg_mapping_failure);
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
ret = -ENOMEM; /* XXX ? */
|
|
goto out;
|
|
}
|
|
} else {
|
|
rm->data.op_count = 0;
|
|
}
|
|
|
|
rds_message_addref(rm);
|
|
ic->i_data_op = &rm->data;
|
|
|
|
/* Finalize the header */
|
|
if (test_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags))
|
|
rm->m_inc.i_hdr.h_flags |= RDS_FLAG_ACK_REQUIRED;
|
|
if (test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags))
|
|
rm->m_inc.i_hdr.h_flags |= RDS_FLAG_RETRANSMITTED;
|
|
|
|
/* If it has a RDMA op, tell the peer we did it. This is
|
|
* used by the peer to release use-once RDMA MRs. */
|
|
if (rm->rdma.op_active) {
|
|
struct rds_ext_header_rdma ext_hdr;
|
|
|
|
ext_hdr.h_rdma_rkey = cpu_to_be32(rm->rdma.op_rkey);
|
|
rds_message_add_extension(&rm->m_inc.i_hdr,
|
|
RDS_EXTHDR_RDMA, &ext_hdr, sizeof(ext_hdr));
|
|
}
|
|
if (rm->m_rdma_cookie) {
|
|
rds_message_add_rdma_dest_extension(&rm->m_inc.i_hdr,
|
|
rds_rdma_cookie_key(rm->m_rdma_cookie),
|
|
rds_rdma_cookie_offset(rm->m_rdma_cookie));
|
|
}
|
|
|
|
/* Note - rds_ib_piggyb_ack clears the ACK_REQUIRED bit, so
|
|
* we should not do this unless we have a chance of at least
|
|
* sticking the header into the send ring. Which is why we
|
|
* should call rds_ib_ring_alloc first. */
|
|
rm->m_inc.i_hdr.h_ack = cpu_to_be64(rds_ib_piggyb_ack(ic));
|
|
rds_message_make_checksum(&rm->m_inc.i_hdr);
|
|
|
|
/*
|
|
* Update adv_credits since we reset the ACK_REQUIRED bit.
|
|
*/
|
|
if (ic->i_flowctl) {
|
|
rds_ib_send_grab_credits(ic, 0, &posted, 1, RDS_MAX_ADV_CREDIT - adv_credits);
|
|
adv_credits += posted;
|
|
BUG_ON(adv_credits > 255);
|
|
}
|
|
}
|
|
|
|
/* Sometimes you want to put a fence between an RDMA
|
|
* READ and the following SEND.
|
|
* We could either do this all the time
|
|
* or when requested by the user. Right now, we let
|
|
* the application choose.
|
|
*/
|
|
if (rm->rdma.op_active && rm->rdma.op_fence)
|
|
send_flags = IB_SEND_FENCE;
|
|
|
|
/* Each frag gets a header. Msgs may be 0 bytes */
|
|
send = &ic->i_sends[pos];
|
|
first = send;
|
|
prev = NULL;
|
|
scat = &ic->i_data_op->op_sg[sg];
|
|
i = 0;
|
|
do {
|
|
unsigned int len = 0;
|
|
|
|
/* Set up the header */
|
|
send->s_wr.send_flags = send_flags;
|
|
send->s_wr.opcode = IB_WR_SEND;
|
|
send->s_wr.num_sge = 1;
|
|
send->s_wr.next = NULL;
|
|
send->s_queued = jiffies;
|
|
send->s_op = NULL;
|
|
|
|
send->s_sge[0].addr = ic->i_send_hdrs_dma
|
|
+ (pos * sizeof(struct rds_header));
|
|
send->s_sge[0].length = sizeof(struct rds_header);
|
|
|
|
memcpy(&ic->i_send_hdrs[pos], &rm->m_inc.i_hdr, sizeof(struct rds_header));
|
|
|
|
/* Set up the data, if present */
|
|
if (i < work_alloc
|
|
&& scat != &rm->data.op_sg[rm->data.op_count]) {
|
|
len = min(RDS_FRAG_SIZE, ib_sg_dma_len(dev, scat) - off);
|
|
send->s_wr.num_sge = 2;
|
|
|
|
send->s_sge[1].addr = ib_sg_dma_address(dev, scat) + off;
|
|
send->s_sge[1].length = len;
|
|
|
|
bytes_sent += len;
|
|
off += len;
|
|
if (off == ib_sg_dma_len(dev, scat)) {
|
|
scat++;
|
|
off = 0;
|
|
}
|
|
}
|
|
|
|
rds_ib_set_wr_signal_state(ic, send, 0);
|
|
|
|
/*
|
|
* Always signal the last one if we're stopping due to flow control.
|
|
*/
|
|
if (ic->i_flowctl && flow_controlled && i == (work_alloc-1))
|
|
send->s_wr.send_flags |= IB_SEND_SIGNALED | IB_SEND_SOLICITED;
|
|
|
|
if (send->s_wr.send_flags & IB_SEND_SIGNALED)
|
|
nr_sig++;
|
|
|
|
rdsdebug("send %p wr %p num_sge %u next %p\n", send,
|
|
&send->s_wr, send->s_wr.num_sge, send->s_wr.next);
|
|
|
|
if (ic->i_flowctl && adv_credits) {
|
|
struct rds_header *hdr = &ic->i_send_hdrs[pos];
|
|
|
|
/* add credit and redo the header checksum */
|
|
hdr->h_credit = adv_credits;
|
|
rds_message_make_checksum(hdr);
|
|
adv_credits = 0;
|
|
rds_ib_stats_inc(s_ib_tx_credit_updates);
|
|
}
|
|
|
|
if (prev)
|
|
prev->s_wr.next = &send->s_wr;
|
|
prev = send;
|
|
|
|
pos = (pos + 1) % ic->i_send_ring.w_nr;
|
|
send = &ic->i_sends[pos];
|
|
i++;
|
|
|
|
} while (i < work_alloc
|
|
&& scat != &rm->data.op_sg[rm->data.op_count]);
|
|
|
|
/* Account the RDS header in the number of bytes we sent, but just once.
|
|
* The caller has no concept of fragmentation. */
|
|
if (hdr_off == 0)
|
|
bytes_sent += sizeof(struct rds_header);
|
|
|
|
/* if we finished the message then send completion owns it */
|
|
if (scat == &rm->data.op_sg[rm->data.op_count]) {
|
|
prev->s_op = ic->i_data_op;
|
|
prev->s_wr.send_flags |= IB_SEND_SOLICITED;
|
|
ic->i_data_op = NULL;
|
|
}
|
|
|
|
/* Put back wrs & credits we didn't use */
|
|
if (i < work_alloc) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc - i);
|
|
work_alloc = i;
|
|
}
|
|
if (ic->i_flowctl && i < credit_alloc)
|
|
rds_ib_send_add_credits(conn, credit_alloc - i);
|
|
|
|
if (nr_sig)
|
|
atomic_add(nr_sig, &ic->i_signaled_sends);
|
|
|
|
/* XXX need to worry about failed_wr and partial sends. */
|
|
failed_wr = &first->s_wr;
|
|
ret = ib_post_send(ic->i_cm_id->qp, &first->s_wr, &failed_wr);
|
|
rdsdebug("ic %p first %p (wr %p) ret %d wr %p\n", ic,
|
|
first, &first->s_wr, ret, failed_wr);
|
|
BUG_ON(failed_wr != &first->s_wr);
|
|
if (ret) {
|
|
printk(KERN_WARNING "RDS/IB: ib_post_send to %pI4 "
|
|
"returned %d\n", &conn->c_faddr, ret);
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_sub_signaled(ic, nr_sig);
|
|
if (prev->s_op) {
|
|
ic->i_data_op = prev->s_op;
|
|
prev->s_op = NULL;
|
|
}
|
|
|
|
rds_ib_conn_error(ic->conn, "ib_post_send failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = bytes_sent;
|
|
out:
|
|
BUG_ON(adv_credits);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Issue atomic operation.
|
|
* A simplified version of the rdma case, we always map 1 SG, and
|
|
* only 8 bytes, for the return value from the atomic operation.
|
|
*/
|
|
int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct rds_ib_send_work *send = NULL;
|
|
struct ib_send_wr *failed_wr;
|
|
struct rds_ib_device *rds_ibdev;
|
|
u32 pos;
|
|
u32 work_alloc;
|
|
int ret;
|
|
int nr_sig = 0;
|
|
|
|
rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
|
|
|
|
work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, 1, &pos);
|
|
if (work_alloc != 1) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_stats_inc(s_ib_tx_ring_full);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* address of send request in ring */
|
|
send = &ic->i_sends[pos];
|
|
send->s_queued = jiffies;
|
|
|
|
if (op->op_type == RDS_ATOMIC_TYPE_CSWP) {
|
|
send->s_wr.opcode = IB_WR_MASKED_ATOMIC_CMP_AND_SWP;
|
|
send->s_wr.wr.atomic.compare_add = op->op_m_cswp.compare;
|
|
send->s_wr.wr.atomic.swap = op->op_m_cswp.swap;
|
|
send->s_wr.wr.atomic.compare_add_mask = op->op_m_cswp.compare_mask;
|
|
send->s_wr.wr.atomic.swap_mask = op->op_m_cswp.swap_mask;
|
|
} else { /* FADD */
|
|
send->s_wr.opcode = IB_WR_MASKED_ATOMIC_FETCH_AND_ADD;
|
|
send->s_wr.wr.atomic.compare_add = op->op_m_fadd.add;
|
|
send->s_wr.wr.atomic.swap = 0;
|
|
send->s_wr.wr.atomic.compare_add_mask = op->op_m_fadd.nocarry_mask;
|
|
send->s_wr.wr.atomic.swap_mask = 0;
|
|
}
|
|
nr_sig = rds_ib_set_wr_signal_state(ic, send, op->op_notify);
|
|
send->s_wr.num_sge = 1;
|
|
send->s_wr.next = NULL;
|
|
send->s_wr.wr.atomic.remote_addr = op->op_remote_addr;
|
|
send->s_wr.wr.atomic.rkey = op->op_rkey;
|
|
send->s_op = op;
|
|
rds_message_addref(container_of(send->s_op, struct rds_message, atomic));
|
|
|
|
/* map 8 byte retval buffer to the device */
|
|
ret = ib_dma_map_sg(ic->i_cm_id->device, op->op_sg, 1, DMA_FROM_DEVICE);
|
|
rdsdebug("ic %p mapping atomic op %p. mapped %d pg\n", ic, op, ret);
|
|
if (ret != 1) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_stats_inc(s_ib_tx_sg_mapping_failure);
|
|
ret = -ENOMEM; /* XXX ? */
|
|
goto out;
|
|
}
|
|
|
|
/* Convert our struct scatterlist to struct ib_sge */
|
|
send->s_sge[0].addr = ib_sg_dma_address(ic->i_cm_id->device, op->op_sg);
|
|
send->s_sge[0].length = ib_sg_dma_len(ic->i_cm_id->device, op->op_sg);
|
|
send->s_sge[0].lkey = ic->i_mr->lkey;
|
|
|
|
rdsdebug("rva %Lx rpa %Lx len %u\n", op->op_remote_addr,
|
|
send->s_sge[0].addr, send->s_sge[0].length);
|
|
|
|
if (nr_sig)
|
|
atomic_add(nr_sig, &ic->i_signaled_sends);
|
|
|
|
failed_wr = &send->s_wr;
|
|
ret = ib_post_send(ic->i_cm_id->qp, &send->s_wr, &failed_wr);
|
|
rdsdebug("ic %p send %p (wr %p) ret %d wr %p\n", ic,
|
|
send, &send->s_wr, ret, failed_wr);
|
|
BUG_ON(failed_wr != &send->s_wr);
|
|
if (ret) {
|
|
printk(KERN_WARNING "RDS/IB: atomic ib_post_send to %pI4 "
|
|
"returned %d\n", &conn->c_faddr, ret);
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_sub_signaled(ic, nr_sig);
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(failed_wr != &send->s_wr)) {
|
|
printk(KERN_WARNING "RDS/IB: atomic ib_post_send() rc=%d, but failed_wqe updated!\n", ret);
|
|
BUG_ON(failed_wr != &send->s_wr);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct rds_ib_send_work *send = NULL;
|
|
struct rds_ib_send_work *first;
|
|
struct rds_ib_send_work *prev;
|
|
struct ib_send_wr *failed_wr;
|
|
struct scatterlist *scat;
|
|
unsigned long len;
|
|
u64 remote_addr = op->op_remote_addr;
|
|
u32 max_sge = ic->rds_ibdev->max_sge;
|
|
u32 pos;
|
|
u32 work_alloc;
|
|
u32 i;
|
|
u32 j;
|
|
int sent;
|
|
int ret;
|
|
int num_sge;
|
|
int nr_sig = 0;
|
|
|
|
/* map the op the first time we see it */
|
|
if (!op->op_mapped) {
|
|
op->op_count = ib_dma_map_sg(ic->i_cm_id->device,
|
|
op->op_sg, op->op_nents, (op->op_write) ?
|
|
DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
rdsdebug("ic %p mapping op %p: %d\n", ic, op, op->op_count);
|
|
if (op->op_count == 0) {
|
|
rds_ib_stats_inc(s_ib_tx_sg_mapping_failure);
|
|
ret = -ENOMEM; /* XXX ? */
|
|
goto out;
|
|
}
|
|
|
|
op->op_mapped = 1;
|
|
}
|
|
|
|
/*
|
|
* Instead of knowing how to return a partial rdma read/write we insist that there
|
|
* be enough work requests to send the entire message.
|
|
*/
|
|
i = ceil(op->op_count, max_sge);
|
|
|
|
work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, i, &pos);
|
|
if (work_alloc != i) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_stats_inc(s_ib_tx_ring_full);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
send = &ic->i_sends[pos];
|
|
first = send;
|
|
prev = NULL;
|
|
scat = &op->op_sg[0];
|
|
sent = 0;
|
|
num_sge = op->op_count;
|
|
|
|
for (i = 0; i < work_alloc && scat != &op->op_sg[op->op_count]; i++) {
|
|
send->s_wr.send_flags = 0;
|
|
send->s_queued = jiffies;
|
|
send->s_op = NULL;
|
|
|
|
nr_sig += rds_ib_set_wr_signal_state(ic, send, op->op_notify);
|
|
|
|
send->s_wr.opcode = op->op_write ? IB_WR_RDMA_WRITE : IB_WR_RDMA_READ;
|
|
send->s_wr.wr.rdma.remote_addr = remote_addr;
|
|
send->s_wr.wr.rdma.rkey = op->op_rkey;
|
|
|
|
if (num_sge > max_sge) {
|
|
send->s_wr.num_sge = max_sge;
|
|
num_sge -= max_sge;
|
|
} else {
|
|
send->s_wr.num_sge = num_sge;
|
|
}
|
|
|
|
send->s_wr.next = NULL;
|
|
|
|
if (prev)
|
|
prev->s_wr.next = &send->s_wr;
|
|
|
|
for (j = 0; j < send->s_wr.num_sge && scat != &op->op_sg[op->op_count]; j++) {
|
|
len = ib_sg_dma_len(ic->i_cm_id->device, scat);
|
|
send->s_sge[j].addr =
|
|
ib_sg_dma_address(ic->i_cm_id->device, scat);
|
|
send->s_sge[j].length = len;
|
|
send->s_sge[j].lkey = ic->i_mr->lkey;
|
|
|
|
sent += len;
|
|
rdsdebug("ic %p sent %d remote_addr %llu\n", ic, sent, remote_addr);
|
|
|
|
remote_addr += len;
|
|
scat++;
|
|
}
|
|
|
|
rdsdebug("send %p wr %p num_sge %u next %p\n", send,
|
|
&send->s_wr, send->s_wr.num_sge, send->s_wr.next);
|
|
|
|
prev = send;
|
|
if (++send == &ic->i_sends[ic->i_send_ring.w_nr])
|
|
send = ic->i_sends;
|
|
}
|
|
|
|
/* give a reference to the last op */
|
|
if (scat == &op->op_sg[op->op_count]) {
|
|
prev->s_op = op;
|
|
rds_message_addref(container_of(op, struct rds_message, rdma));
|
|
}
|
|
|
|
if (i < work_alloc) {
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc - i);
|
|
work_alloc = i;
|
|
}
|
|
|
|
if (nr_sig)
|
|
atomic_add(nr_sig, &ic->i_signaled_sends);
|
|
|
|
failed_wr = &first->s_wr;
|
|
ret = ib_post_send(ic->i_cm_id->qp, &first->s_wr, &failed_wr);
|
|
rdsdebug("ic %p first %p (wr %p) ret %d wr %p\n", ic,
|
|
first, &first->s_wr, ret, failed_wr);
|
|
BUG_ON(failed_wr != &first->s_wr);
|
|
if (ret) {
|
|
printk(KERN_WARNING "RDS/IB: rdma ib_post_send to %pI4 "
|
|
"returned %d\n", &conn->c_faddr, ret);
|
|
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
|
|
rds_ib_sub_signaled(ic, nr_sig);
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(failed_wr != &first->s_wr)) {
|
|
printk(KERN_WARNING "RDS/IB: ib_post_send() rc=%d, but failed_wqe updated!\n", ret);
|
|
BUG_ON(failed_wr != &first->s_wr);
|
|
}
|
|
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void rds_ib_xmit_complete(struct rds_connection *conn)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
|
|
/* We may have a pending ACK or window update we were unable
|
|
* to send previously (due to flow control). Try again. */
|
|
rds_ib_attempt_ack(ic);
|
|
}
|