diff options
| -rw-r--r-- | include/linux/sunrpc/svc_rdma.h | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_transport.c | 129 |
2 files changed, 40 insertions, 91 deletions
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index c2b0d95602d8f..cf79ab86d3d4f 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -75,6 +75,7 @@ struct svc_rdma_op_ctxt { struct svc_rdma_fastreg_mr *frmr; int hdr_count; struct xdr_buf arg; + struct ib_cqe cqe; struct list_head dto_q; enum ib_wr_opcode wr_op; enum ib_wc_status wc_status; @@ -174,7 +175,6 @@ struct svcxprt_rdma { struct work_struct sc_work; }; /* sc_flags */ -#define RDMAXPRT_RQ_PENDING 1 #define RDMAXPRT_SQ_PENDING 2 #define RDMAXPRT_CONN_PENDING 3 diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 15c8fa3ee794c..5dfa1b6bf0c24 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -68,7 +68,6 @@ static void svc_rdma_detach(struct svc_xprt *xprt); static void svc_rdma_free(struct svc_xprt *xprt); static int svc_rdma_has_wspace(struct svc_xprt *xprt); static int svc_rdma_secure_port(struct svc_rqst *); -static void rq_cq_reap(struct svcxprt_rdma *xprt); static void sq_cq_reap(struct svcxprt_rdma *xprt); static DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL); @@ -413,7 +412,6 @@ static void dto_tasklet_func(unsigned long data) list_del_init(&xprt->sc_dto_q); spin_unlock_irqrestore(&dto_lock, flags); - rq_cq_reap(xprt); sq_cq_reap(xprt); svc_xprt_put(&xprt->sc_xprt); @@ -422,93 +420,48 @@ static void dto_tasklet_func(unsigned long data) spin_unlock_irqrestore(&dto_lock, flags); } -/* - * Receive Queue Completion Handler - * - * Since an RQ completion handler is called on interrupt context, we - * need to defer the handling of the I/O to a tasklet - */ -static void rq_comp_handler(struct ib_cq *cq, void *cq_context) -{ - struct svcxprt_rdma *xprt = cq_context; - unsigned long flags; - - /* Guard against unconditional flush call for destroyed QP */ - if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) - return; - - /* - * Set the bit regardless of whether or not it's on the list - * because it may be on the list already due to an SQ - * completion. - */ - set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags); - - /* - * If this transport is not already on the DTO transport queue, - * add it - */ - spin_lock_irqsave(&dto_lock, flags); - if (list_empty(&xprt->sc_dto_q)) { - svc_xprt_get(&xprt->sc_xprt); - list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); - } - spin_unlock_irqrestore(&dto_lock, flags); - - /* Tasklet does all the work to avoid irqsave locks. */ - tasklet_schedule(&dto_tasklet); -} - -/* - * rq_cq_reap - Process the RQ CQ. +/** + * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC + * @cq: completion queue + * @wc: completed WR * - * Take all completing WC off the CQE and enqueue the associated DTO - * context on the dto_q for the transport. - * - * Note that caller must hold a transport reference. */ -static void rq_cq_reap(struct svcxprt_rdma *xprt) +static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) { - int ret; - struct ib_wc wc; - struct svc_rdma_op_ctxt *ctxt = NULL; - - if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) - return; + struct svcxprt_rdma *xprt = cq->cq_context; + struct ib_cqe *cqe = wc->wr_cqe; + struct svc_rdma_op_ctxt *ctxt; - ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); - atomic_inc(&rdma_stat_rq_poll); + /* WARNING: Only wc->wr_cqe and wc->status are reliable */ + ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); + ctxt->wc_status = wc->status; + svc_rdma_unmap_dma(ctxt); - while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { - ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; - ctxt->wc_status = wc.status; - ctxt->byte_len = wc.byte_len; - svc_rdma_unmap_dma(ctxt); - if (wc.status != IB_WC_SUCCESS) { - /* Close the transport */ - dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt); - set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); - svc_rdma_put_context(ctxt, 1); - svc_xprt_put(&xprt->sc_xprt); - continue; - } - spin_lock_bh(&xprt->sc_rq_dto_lock); - list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); - spin_unlock_bh(&xprt->sc_rq_dto_lock); - svc_xprt_put(&xprt->sc_xprt); - } + if (wc->status != IB_WC_SUCCESS) + goto flushed; - if (ctxt) - atomic_inc(&rdma_stat_rq_prod); + /* All wc fields are now known to be valid */ + ctxt->byte_len = wc->byte_len; + spin_lock(&xprt->sc_rq_dto_lock); + list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); + spin_unlock(&xprt->sc_rq_dto_lock); set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); - /* - * If data arrived before established event, - * don't enqueue. This defers RPC I/O until the - * RDMA connection is complete. - */ - if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) - svc_xprt_enqueue(&xprt->sc_xprt); + if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) + goto out; + svc_xprt_enqueue(&xprt->sc_xprt); + goto out; + +flushed: + if (wc->status != IB_WC_WR_FLUSH_ERR) + pr_warn("svcrdma: receive: %s (%u/0x%x)\n", + ib_wc_status_msg(wc->status), + wc->status, wc->vendor_err); + set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); + svc_rdma_put_context(ctxt, 1); + +out: + svc_xprt_put(&xprt->sc_xprt); } /* @@ -681,6 +634,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags) ctxt = svc_rdma_get_context(xprt); buflen = 0; ctxt->direction = DMA_FROM_DEVICE; + ctxt->cqe.done = svc_rdma_wc_receive; for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { if (sge_no >= xprt->sc_max_sge) { pr_err("svcrdma: Too many sges (%d)\n", sge_no); @@ -705,7 +659,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags) recv_wr.next = NULL; recv_wr.sg_list = &ctxt->sge[0]; recv_wr.num_sge = ctxt->count; - recv_wr.wr_id = (u64)(unsigned long)ctxt; + recv_wr.wr_cqe = &ctxt->cqe; svc_xprt_get(&xprt->sc_xprt); ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); @@ -1094,12 +1048,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) dprintk("svcrdma: error creating SQ CQ for connect request\n"); goto errout; } - cq_attr.cqe = newxprt->sc_rq_depth; - newxprt->sc_rq_cq = ib_create_cq(dev, - rq_comp_handler, - cq_event_handler, - newxprt, - &cq_attr); + newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth, + 0, IB_POLL_SOFTIRQ); if (IS_ERR(newxprt->sc_rq_cq)) { dprintk("svcrdma: error creating RQ CQ for connect request\n"); goto errout; @@ -1193,7 +1143,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) * miss the first message */ ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP); - ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP); /* Accept Connection */ set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); @@ -1337,7 +1286,7 @@ static void __svc_rdma_free(struct work_struct *work) ib_destroy_cq(rdma->sc_sq_cq); if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) - ib_destroy_cq(rdma->sc_rq_cq); + ib_free_cq(rdma->sc_rq_cq); if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) ib_dealloc_pd(rdma->sc_pd); |