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xprtrdma: Split the completion queue
The current CQ handler uses the ib_wc.opcode field to distinguish
between event types. However, the contents of that field are not
reliable if the completion status is not IB_WC_SUCCESS.
When an error completion occurs on a send event, the CQ handler
schedules a tasklet with something that is not a struct rpcrdma_rep.
This is never correct behavior, and sometimes it results in a panic.
To resolve this issue, split the completion queue into a send CQ and
a receive CQ. The send CQ handler now handles only struct rpcrdma_mw
wr_id's, and the receive CQ handler now handles only struct
rpcrdma_rep wr_id's.
Fix suggested by Shirley Ma <shirley.ma@oracle.com>
Reported-by: Rafael Reiter <rafael.reiter@ims.co.at>
Fixes: 5c635e09ce
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=73211
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Klemens Senn <klemens.senn@ims.co.at>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
Anna Schumaker
parent
7f1d54191e
commit
fc66448549
@ -142,96 +142,115 @@ rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
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}
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}
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static inline
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void rpcrdma_event_process(struct ib_wc *wc)
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static void
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rpcrdma_sendcq_process_wc(struct ib_wc *wc)
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{
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struct rpcrdma_mw *frmr;
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struct rpcrdma_rep *rep =
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(struct rpcrdma_rep *)(unsigned long) wc->wr_id;
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struct rpcrdma_mw *frmr = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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dprintk("RPC: %s: event rep %p status %X opcode %X length %u\n",
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__func__, rep, wc->status, wc->opcode, wc->byte_len);
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dprintk("RPC: %s: frmr %p status %X opcode %d\n",
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__func__, frmr, wc->status, wc->opcode);
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if (!rep) /* send completion that we don't care about */
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if (wc->wr_id == 0ULL)
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return;
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if (wc->status != IB_WC_SUCCESS)
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return;
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if (IB_WC_SUCCESS != wc->status) {
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dprintk("RPC: %s: WC opcode %d status %X, connection lost\n",
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__func__, wc->opcode, wc->status);
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rep->rr_len = ~0U;
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if (wc->opcode != IB_WC_FAST_REG_MR && wc->opcode != IB_WC_LOCAL_INV)
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rpcrdma_schedule_tasklet(rep);
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return;
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}
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switch (wc->opcode) {
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case IB_WC_FAST_REG_MR:
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frmr = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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if (wc->opcode == IB_WC_FAST_REG_MR)
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frmr->r.frmr.state = FRMR_IS_VALID;
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break;
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case IB_WC_LOCAL_INV:
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frmr = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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else if (wc->opcode == IB_WC_LOCAL_INV)
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frmr->r.frmr.state = FRMR_IS_INVALID;
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break;
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case IB_WC_RECV:
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rep->rr_len = wc->byte_len;
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ib_dma_sync_single_for_cpu(
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rdmab_to_ia(rep->rr_buffer)->ri_id->device,
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rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE);
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/* Keep (only) the most recent credits, after check validity */
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if (rep->rr_len >= 16) {
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struct rpcrdma_msg *p =
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(struct rpcrdma_msg *) rep->rr_base;
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unsigned int credits = ntohl(p->rm_credit);
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if (credits == 0) {
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dprintk("RPC: %s: server"
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" dropped credits to 0!\n", __func__);
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/* don't deadlock */
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credits = 1;
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} else if (credits > rep->rr_buffer->rb_max_requests) {
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dprintk("RPC: %s: server"
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" over-crediting: %d (%d)\n",
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__func__, credits,
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rep->rr_buffer->rb_max_requests);
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credits = rep->rr_buffer->rb_max_requests;
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}
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atomic_set(&rep->rr_buffer->rb_credits, credits);
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}
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rpcrdma_schedule_tasklet(rep);
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break;
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default:
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dprintk("RPC: %s: unexpected WC event %X\n",
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__func__, wc->opcode);
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break;
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}
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}
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static inline int
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rpcrdma_cq_poll(struct ib_cq *cq)
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static int
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rpcrdma_sendcq_poll(struct ib_cq *cq)
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{
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struct ib_wc wc;
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int rc;
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for (;;) {
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rc = ib_poll_cq(cq, 1, &wc);
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if (rc < 0) {
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dprintk("RPC: %s: ib_poll_cq failed %i\n",
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__func__, rc);
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return rc;
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}
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if (rc == 0)
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break;
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rpcrdma_event_process(&wc);
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}
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return 0;
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while ((rc = ib_poll_cq(cq, 1, &wc)) == 1)
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rpcrdma_sendcq_process_wc(&wc);
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return rc;
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}
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/*
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* rpcrdma_cq_event_upcall
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* Handle send, fast_reg_mr, and local_inv completions.
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*
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* Send events are typically suppressed and thus do not result
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* in an upcall. Occasionally one is signaled, however. This
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* prevents the provider's completion queue from wrapping and
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* losing a completion.
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*/
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static void
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rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context)
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{
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int rc;
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rc = rpcrdma_sendcq_poll(cq);
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if (rc) {
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dprintk("RPC: %s: ib_poll_cq failed: %i\n",
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__func__, rc);
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return;
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}
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rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
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if (rc) {
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dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
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__func__, rc);
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return;
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}
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rpcrdma_sendcq_poll(cq);
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}
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static void
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rpcrdma_recvcq_process_wc(struct ib_wc *wc)
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{
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struct rpcrdma_rep *rep =
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(struct rpcrdma_rep *)(unsigned long)wc->wr_id;
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dprintk("RPC: %s: rep %p status %X opcode %X length %u\n",
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__func__, rep, wc->status, wc->opcode, wc->byte_len);
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if (wc->status != IB_WC_SUCCESS) {
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rep->rr_len = ~0U;
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goto out_schedule;
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}
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if (wc->opcode != IB_WC_RECV)
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return;
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rep->rr_len = wc->byte_len;
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ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device,
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rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE);
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if (rep->rr_len >= 16) {
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struct rpcrdma_msg *p = (struct rpcrdma_msg *)rep->rr_base;
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unsigned int credits = ntohl(p->rm_credit);
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if (credits == 0)
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credits = 1; /* don't deadlock */
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else if (credits > rep->rr_buffer->rb_max_requests)
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credits = rep->rr_buffer->rb_max_requests;
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atomic_set(&rep->rr_buffer->rb_credits, credits);
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}
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out_schedule:
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rpcrdma_schedule_tasklet(rep);
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}
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static int
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rpcrdma_recvcq_poll(struct ib_cq *cq)
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{
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struct ib_wc wc;
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int rc;
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while ((rc = ib_poll_cq(cq, 1, &wc)) == 1)
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rpcrdma_recvcq_process_wc(&wc);
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return rc;
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}
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/*
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* Handle receive completions.
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*
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* This upcall handles recv and send events.
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* It is reentrant but processes single events in order to maintain
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* ordering of receives to keep server credits.
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*
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@ -240,26 +259,27 @@ rpcrdma_cq_poll(struct ib_cq *cq)
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* connection shutdown. That is, the structures required for
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* the completion of the reply handler must remain intact until
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* all memory has been reclaimed.
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*
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* Note that send events are suppressed and do not result in an upcall.
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*/
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static void
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rpcrdma_cq_event_upcall(struct ib_cq *cq, void *context)
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rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context)
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{
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int rc;
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rc = rpcrdma_cq_poll(cq);
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if (rc)
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return;
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rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
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rc = rpcrdma_recvcq_poll(cq);
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if (rc) {
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dprintk("RPC: %s: ib_req_notify_cq failed %i\n",
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dprintk("RPC: %s: ib_poll_cq failed: %i\n",
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__func__, rc);
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return;
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}
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rpcrdma_cq_poll(cq);
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rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
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if (rc) {
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dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
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__func__, rc);
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return;
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}
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rpcrdma_recvcq_poll(cq);
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}
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#ifdef RPC_DEBUG
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@ -610,6 +630,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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struct rpcrdma_create_data_internal *cdata)
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{
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struct ib_device_attr devattr;
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struct ib_cq *sendcq, *recvcq;
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int rc, err;
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rc = ib_query_device(ia->ri_id->device, &devattr);
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@ -685,7 +706,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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ep->rep_attr.cap.max_recv_sge);
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/* set trigger for requesting send completion */
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ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 /* - 1*/;
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ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
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if (ep->rep_cqinit <= 2)
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ep->rep_cqinit = 0;
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INIT_CQCOUNT(ep);
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@ -693,26 +714,43 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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init_waitqueue_head(&ep->rep_connect_wait);
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INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
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ep->rep_cq = ib_create_cq(ia->ri_id->device, rpcrdma_cq_event_upcall,
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sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall,
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rpcrdma_cq_async_error_upcall, NULL,
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ep->rep_attr.cap.max_recv_wr +
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ep->rep_attr.cap.max_send_wr + 1, 0);
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if (IS_ERR(ep->rep_cq)) {
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rc = PTR_ERR(ep->rep_cq);
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dprintk("RPC: %s: ib_create_cq failed: %i\n",
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if (IS_ERR(sendcq)) {
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rc = PTR_ERR(sendcq);
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dprintk("RPC: %s: failed to create send CQ: %i\n",
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__func__, rc);
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goto out1;
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}
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rc = ib_req_notify_cq(ep->rep_cq, IB_CQ_NEXT_COMP);
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rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP);
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if (rc) {
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dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
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__func__, rc);
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goto out2;
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}
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ep->rep_attr.send_cq = ep->rep_cq;
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ep->rep_attr.recv_cq = ep->rep_cq;
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recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall,
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rpcrdma_cq_async_error_upcall, NULL,
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ep->rep_attr.cap.max_recv_wr + 1, 0);
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if (IS_ERR(recvcq)) {
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rc = PTR_ERR(recvcq);
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dprintk("RPC: %s: failed to create recv CQ: %i\n",
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__func__, rc);
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goto out2;
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}
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rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP);
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if (rc) {
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dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
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__func__, rc);
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ib_destroy_cq(recvcq);
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goto out2;
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}
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ep->rep_attr.send_cq = sendcq;
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ep->rep_attr.recv_cq = recvcq;
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/* Initialize cma parameters */
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@ -734,7 +772,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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return 0;
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out2:
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err = ib_destroy_cq(ep->rep_cq);
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err = ib_destroy_cq(sendcq);
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if (err)
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dprintk("RPC: %s: ib_destroy_cq returned %i\n",
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__func__, err);
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@ -774,8 +812,14 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
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ep->rep_pad_mr = NULL;
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}
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rpcrdma_clean_cq(ep->rep_cq);
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rc = ib_destroy_cq(ep->rep_cq);
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rpcrdma_clean_cq(ep->rep_attr.recv_cq);
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rc = ib_destroy_cq(ep->rep_attr.recv_cq);
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if (rc)
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dprintk("RPC: %s: ib_destroy_cq returned %i\n",
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__func__, rc);
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rpcrdma_clean_cq(ep->rep_attr.send_cq);
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rc = ib_destroy_cq(ep->rep_attr.send_cq);
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if (rc)
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dprintk("RPC: %s: ib_destroy_cq returned %i\n",
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__func__, rc);
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@ -798,7 +842,9 @@ retry:
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if (rc && rc != -ENOTCONN)
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dprintk("RPC: %s: rpcrdma_ep_disconnect"
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" status %i\n", __func__, rc);
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rpcrdma_clean_cq(ep->rep_cq);
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rpcrdma_clean_cq(ep->rep_attr.recv_cq);
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rpcrdma_clean_cq(ep->rep_attr.send_cq);
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xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
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id = rpcrdma_create_id(xprt, ia,
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@ -907,7 +953,8 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
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{
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int rc;
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rpcrdma_clean_cq(ep->rep_cq);
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rpcrdma_clean_cq(ep->rep_attr.recv_cq);
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rpcrdma_clean_cq(ep->rep_attr.send_cq);
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rc = rdma_disconnect(ia->ri_id);
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if (!rc) {
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/* returns without wait if not connected */
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@ -1727,7 +1774,6 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
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ib_dma_sync_single_for_cpu(ia->ri_id->device,
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rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL);
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DECR_CQCOUNT(ep);
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rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
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if (rc)
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@ -79,7 +79,6 @@ struct rpcrdma_ep {
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int rep_cqinit;
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int rep_connected;
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struct rpcrdma_ia *rep_ia;
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struct ib_cq *rep_cq;
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struct ib_qp_init_attr rep_attr;
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wait_queue_head_t rep_connect_wait;
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struct ib_sge rep_pad; /* holds zeroed pad */
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