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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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xprtrdma: Use new CQ API for RPC-over-RDMA client send CQs
Calling ib_poll_cq() to sort through WCs during a completion is a
common pattern amongst RDMA consumers. Since commit 14d3a3b249
("IB: add a proper completion queue abstraction"), WC sorting can
be handled by the IB core.
By converting to this new API, xprtrdma is made a better neighbor to
other RDMA consumers, as it allows the core to schedule the delivery
of completions more fairly amongst all active consumers.
Because each ib_cqe carries a pointer to a completion method, the
core can now post its own operations on a consumer's QP, and handle
the completions itself, without changes to the consumer.
Send completions were previously handled entirely in the completion
upcall handler (ie, deferring to a process context is unneeded).
Thus IB_POLL_SOFTIRQ is a direct replacement for the current
xprtrdma send code path.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Devesh Sharma <devesh.sharma@broadcom.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
Anna Schumaker
parent
c882a655b7
commit
2fa8f88d88
3 changed files with 94 additions and 128 deletions
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@ -158,6 +158,8 @@ __frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
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sg_init_table(f->sg, depth);
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init_completion(&f->fr_linv_done);
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return 0;
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out_mr_err:
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@ -244,39 +246,76 @@ frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
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rpcrdma_max_segments(r_xprt) * ia->ri_max_frmr_depth);
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}
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/* If FAST_REG or LOCAL_INV failed, indicate the frmr needs
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* to be reset.
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*
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* WARNING: Only wr_id and status are reliable at this point
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*/
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static void
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__frwr_sendcompletion_flush(struct ib_wc *wc, struct rpcrdma_mw *r)
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__frwr_sendcompletion_flush(struct ib_wc *wc, struct rpcrdma_frmr *frmr,
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const char *wr)
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{
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if (likely(wc->status == IB_WC_SUCCESS))
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return;
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/* WARNING: Only wr_id and status are reliable at this point */
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r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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if (wc->status == IB_WC_WR_FLUSH_ERR)
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dprintk("RPC: %s: frmr %p flushed\n", __func__, r);
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else
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pr_warn("RPC: %s: frmr %p error, status %s (%d)\n",
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__func__, r, ib_wc_status_msg(wc->status), wc->status);
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r->frmr.fr_state = FRMR_IS_STALE;
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frmr->fr_state = FRMR_IS_STALE;
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: %s: %s (%u/0x%x)\n",
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wr, ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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}
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/**
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* frwr_wc_fastreg - Invoked by RDMA provider for each polled FastReg WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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frwr_sendcompletion(struct ib_wc *wc)
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frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct rpcrdma_mw *r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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struct rpcrdma_frmr *f = &r->frmr;
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struct rpcrdma_frmr *frmr;
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struct ib_cqe *cqe;
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if (unlikely(wc->status != IB_WC_SUCCESS))
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__frwr_sendcompletion_flush(wc, r);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS) {
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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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__frwr_sendcompletion_flush(wc, frmr, "fastreg");
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}
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}
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if (f->fr_waiter)
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complete(&f->fr_linv_done);
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/**
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* frwr_wc_localinv - Invoked by RDMA provider for each polled LocalInv WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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frwr_wc_localinv(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct rpcrdma_frmr *frmr;
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struct ib_cqe *cqe;
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS) {
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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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__frwr_sendcompletion_flush(wc, frmr, "localinv");
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}
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}
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/**
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* frwr_wc_localinv - Invoked by RDMA provider for each polled LocalInv WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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* Awaken anyone waiting for an MR to finish being fenced.
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*/
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static void
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frwr_wc_localinv_wake(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct rpcrdma_frmr *frmr;
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struct ib_cqe *cqe;
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/* WARNING: Only wr_cqe and status are reliable at this point */
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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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if (wc->status != IB_WC_SUCCESS)
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__frwr_sendcompletion_flush(wc, frmr, "localinv");
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complete_all(&frmr->fr_linv_done);
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}
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static int
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@ -313,7 +352,6 @@ frwr_op_init(struct rpcrdma_xprt *r_xprt)
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list_add(&r->mw_list, &buf->rb_mws);
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list_add(&r->mw_all, &buf->rb_all);
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r->mw_sendcompletion = frwr_sendcompletion;
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r->frmr.fr_xprt = r_xprt;
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}
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@ -350,7 +388,6 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
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} while (mw->frmr.fr_state != FRMR_IS_INVALID);
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frmr = &mw->frmr;
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frmr->fr_state = FRMR_IS_VALID;
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frmr->fr_waiter = false;
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mr = frmr->fr_mr;
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reg_wr = &frmr->fr_regwr;
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@ -400,7 +437,8 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
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reg_wr->wr.next = NULL;
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reg_wr->wr.opcode = IB_WR_REG_MR;
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reg_wr->wr.wr_id = (uintptr_t)mw;
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frmr->fr_cqe.done = frwr_wc_fastreg;
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reg_wr->wr.wr_cqe = &frmr->fr_cqe;
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reg_wr->wr.num_sge = 0;
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reg_wr->wr.send_flags = 0;
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reg_wr->mr = mr;
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@ -437,12 +475,12 @@ __frwr_prepare_linv_wr(struct rpcrdma_mr_seg *seg)
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struct rpcrdma_frmr *f = &mw->frmr;
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struct ib_send_wr *invalidate_wr;
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f->fr_waiter = false;
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f->fr_state = FRMR_IS_INVALID;
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invalidate_wr = &f->fr_invwr;
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memset(invalidate_wr, 0, sizeof(*invalidate_wr));
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invalidate_wr->wr_id = (unsigned long)(void *)mw;
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f->fr_cqe.done = frwr_wc_localinv;
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invalidate_wr->wr_cqe = &f->fr_cqe;
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invalidate_wr->opcode = IB_WR_LOCAL_INV;
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invalidate_wr->ex.invalidate_rkey = f->fr_mr->rkey;
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@ -511,8 +549,8 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
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* are complete.
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*/
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f->fr_invwr.send_flags = IB_SEND_SIGNALED;
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f->fr_waiter = true;
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init_completion(&f->fr_linv_done);
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f->fr_cqe.done = frwr_wc_localinv_wake;
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reinit_completion(&f->fr_linv_done);
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INIT_CQCOUNT(&r_xprt->rx_ep);
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/* Transport disconnect drains the receive CQ before it
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@ -564,7 +602,8 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
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invalidate_wr = &mw->frmr.fr_invwr;
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memset(invalidate_wr, 0, sizeof(*invalidate_wr));
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invalidate_wr->wr_id = (uintptr_t)mw;
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frmr->fr_cqe.done = frwr_wc_localinv;
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invalidate_wr->wr_cqe = &frmr->fr_cqe;
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invalidate_wr->opcode = IB_WR_LOCAL_INV;
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invalidate_wr->ex.invalidate_rkey = frmr->fr_mr->rkey;
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DECR_CQCOUNT(&r_xprt->rx_ep);
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@ -112,73 +112,20 @@ rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
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}
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}
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static void
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rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
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{
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struct rpcrdma_ep *ep = context;
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pr_err("RPC: %s: %s on device %s ep %p\n",
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__func__, ib_event_msg(event->event),
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event->device->name, context);
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if (ep->rep_connected == 1) {
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ep->rep_connected = -EIO;
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rpcrdma_conn_func(ep);
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wake_up_all(&ep->rep_connect_wait);
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}
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}
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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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/* WARNING: Only wr_id and status are reliable at this point */
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if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) {
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if (wc->status != IB_WC_SUCCESS &&
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wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("RPC: %s: SEND: %s\n",
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__func__, ib_wc_status_msg(wc->status));
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} else {
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struct rpcrdma_mw *r;
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r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
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r->mw_sendcompletion(wc);
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}
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}
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/* The common case is a single send completion is waiting. By
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* passing two WC entries to ib_poll_cq, a return code of 1
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* means there is exactly one WC waiting and no more. We don't
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* have to invoke ib_poll_cq again to know that the CQ has been
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* properly drained.
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/**
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* rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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rpcrdma_sendcq_poll(struct ib_cq *cq)
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rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_wc *pos, wcs[2];
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int count, rc;
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do {
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pos = wcs;
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rc = ib_poll_cq(cq, ARRAY_SIZE(wcs), pos);
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if (rc < 0)
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break;
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count = rc;
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while (count-- > 0)
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rpcrdma_sendcq_process_wc(pos++);
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} while (rc == ARRAY_SIZE(wcs));
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return;
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}
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/* Handle provider send completion upcalls.
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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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do {
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rpcrdma_sendcq_poll(cq);
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} while (ib_req_notify_cq(cq, IB_CQ_NEXT_COMP |
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IB_CQ_REPORT_MISSED_EVENTS) > 0);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: Send: %s (%u/0x%x)\n",
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ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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}
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static void
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@ -263,8 +210,6 @@ rpcrdma_flush_cqs(struct rpcrdma_ep *ep)
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while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0)
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rpcrdma_receive_wc(NULL, &wc);
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while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0)
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rpcrdma_sendcq_process_wc(&wc);
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}
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static int
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@ -556,9 +501,8 @@ 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_cq *sendcq, *recvcq;
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struct ib_cq_init_attr cq_attr = {};
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unsigned int max_qp_wr;
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int rc, err;
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int rc;
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if (ia->ri_device->attrs.max_sge < RPCRDMA_MAX_IOVS) {
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dprintk("RPC: %s: insufficient sge's available\n",
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@ -610,9 +554,9 @@ 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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cq_attr.cqe = ep->rep_attr.cap.max_send_wr + 1;
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sendcq = ib_create_cq(ia->ri_device, rpcrdma_sendcq_upcall,
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rpcrdma_cq_async_error_upcall, NULL, &cq_attr);
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sendcq = ib_alloc_cq(ia->ri_device, NULL,
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ep->rep_attr.cap.max_send_wr + 1,
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0, IB_POLL_SOFTIRQ);
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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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@ -620,13 +564,6 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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goto out1;
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}
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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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recvcq = ib_alloc_cq(ia->ri_device, NULL,
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ep->rep_attr.cap.max_recv_wr + 1,
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0, IB_POLL_SOFTIRQ);
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@ -661,10 +598,7 @@ 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(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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ib_free_cq(sendcq);
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out1:
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if (ia->ri_dma_mr)
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ib_dereg_mr(ia->ri_dma_mr);
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@ -700,11 +634,7 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
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}
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ib_free_cq(ep->rep_attr.recv_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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ib_free_cq(ep->rep_attr.send_cq);
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if (ia->ri_dma_mr) {
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rc = ib_dereg_mr(ia->ri_dma_mr);
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@ -883,6 +813,7 @@ rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
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spin_lock(&buffer->rb_reqslock);
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list_add(&req->rl_all, &buffer->rb_allreqs);
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spin_unlock(&buffer->rb_reqslock);
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req->rl_cqe.done = rpcrdma_wc_send;
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req->rl_buffer = &r_xprt->rx_buf;
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return req;
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}
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@ -1246,7 +1177,7 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
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}
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send_wr.next = NULL;
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send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION;
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send_wr.wr_cqe = &req->rl_cqe;
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send_wr.sg_list = iov;
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send_wr.num_sge = req->rl_niovs;
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send_wr.opcode = IB_WR_SEND;
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|
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@ -95,10 +95,6 @@ struct rpcrdma_ep {
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#define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
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#define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
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/* Force completion handler to ignore the signal
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*/
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#define RPCRDMA_IGNORE_COMPLETION (0ULL)
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/* Pre-allocate extra Work Requests for handling backward receives
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* and sends. This is a fixed value because the Work Queues are
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* allocated when the forward channel is set up.
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@ -205,11 +201,11 @@ struct rpcrdma_frmr {
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struct scatterlist *sg;
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int sg_nents;
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struct ib_mr *fr_mr;
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struct ib_cqe fr_cqe;
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enum rpcrdma_frmr_state fr_state;
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struct completion fr_linv_done;
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struct work_struct fr_work;
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struct rpcrdma_xprt *fr_xprt;
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bool fr_waiter;
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struct completion fr_linv_done;;
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union {
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struct ib_reg_wr fr_regwr;
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struct ib_send_wr fr_invwr;
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@ -226,7 +222,6 @@ struct rpcrdma_mw {
|
|||
struct rpcrdma_fmr fmr;
|
||||
struct rpcrdma_frmr frmr;
|
||||
};
|
||||
void (*mw_sendcompletion)(struct ib_wc *);
|
||||
struct list_head mw_list;
|
||||
struct list_head mw_all;
|
||||
};
|
||||
|
|
@ -282,6 +277,7 @@ struct rpcrdma_req {
|
|||
struct rpcrdma_regbuf *rl_sendbuf;
|
||||
struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
|
||||
|
||||
struct ib_cqe rl_cqe;
|
||||
struct list_head rl_all;
|
||||
bool rl_backchannel;
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue