diff options
Diffstat (limited to 'net/sunrpc/xprtrdma/rpc_rdma.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/rpc_rdma.c | 152 |
1 files changed, 65 insertions, 87 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index 85115a2e2639..4345e6912392 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -366,6 +366,9 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, unsigned int pos; int nsegs; + if (rtype == rpcrdma_noch) + goto done; + pos = rqst->rq_snd_buf.head[0].iov_len; if (rtype == rpcrdma_areadch) pos = 0; @@ -389,7 +392,8 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, nsegs -= mr->mr_nents; } while (nsegs); - return 0; +done: + return encode_item_not_present(xdr); } /* Register and XDR encode the Write list. Supports encoding a list @@ -417,6 +421,9 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, int nsegs, nchunks; __be32 *segcount; + if (wtype != rpcrdma_writech) + goto done; + seg = req->rl_segments; nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_rcv_buf, rqst->rq_rcv_buf.head[0].iov_len, @@ -451,7 +458,8 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, /* Update count of segments in this Write chunk */ *segcount = cpu_to_be32(nchunks); - return 0; +done: + return encode_item_not_present(xdr); } /* Register and XDR encode the Reply chunk. Supports encoding an array @@ -476,6 +484,9 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, int nsegs, nchunks; __be32 *segcount; + if (wtype != rpcrdma_replych) + return encode_item_not_present(xdr); + seg = req->rl_segments; nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_rcv_buf, 0, wtype, seg); if (nsegs < 0) @@ -511,6 +522,16 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, return 0; } +static void rpcrdma_sendctx_done(struct kref *kref) +{ + struct rpcrdma_req *req = + container_of(kref, struct rpcrdma_req, rl_kref); + struct rpcrdma_rep *rep = req->rl_reply; + + rpcrdma_complete_rqst(rep); + rep->rr_rxprt->rx_stats.reply_waits_for_send++; +} + /** * rpcrdma_sendctx_unmap - DMA-unmap Send buffer * @sc: sendctx containing SGEs to unmap @@ -520,6 +541,9 @@ void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc) { struct ib_sge *sge; + if (!sc->sc_unmap_count) + return; + /* The first two SGEs contain the transport header and * the inline buffer. These are always left mapped so * they can be cheaply re-used. @@ -529,9 +553,7 @@ void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc) ib_dma_unmap_page(sc->sc_device, sge->addr, sge->length, DMA_TO_DEVICE); - if (test_and_clear_bit(RPCRDMA_REQ_F_TX_RESOURCES, - &sc->sc_req->rl_flags)) - wake_up_bit(&sc->sc_req->rl_flags, RPCRDMA_REQ_F_TX_RESOURCES); + kref_put(&sc->sc_req->rl_kref, rpcrdma_sendctx_done); } /* Prepare an SGE for the RPC-over-RDMA transport header. @@ -666,7 +688,7 @@ map_tail: out: sc->sc_wr.num_sge += sge_no; if (sc->sc_unmap_count) - __set_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags); + kref_get(&req->rl_kref); return true; out_regbuf: @@ -699,22 +721,28 @@ rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, u32 hdrlen, struct xdr_buf *xdr, enum rpcrdma_chunktype rtype) { + int ret; + + ret = -EAGAIN; req->rl_sendctx = rpcrdma_sendctx_get_locked(r_xprt); if (!req->rl_sendctx) - return -EAGAIN; + goto err; req->rl_sendctx->sc_wr.num_sge = 0; req->rl_sendctx->sc_unmap_count = 0; req->rl_sendctx->sc_req = req; - __clear_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags); + kref_init(&req->rl_kref); + ret = -EIO; if (!rpcrdma_prepare_hdr_sge(r_xprt, req, hdrlen)) - return -EIO; - + goto err; if (rtype != rpcrdma_areadch) if (!rpcrdma_prepare_msg_sges(r_xprt, req, xdr, rtype)) - return -EIO; - + goto err; return 0; + +err: + trace_xprtrdma_prepsend_failed(&req->rl_slot, ret); + return ret; } /** @@ -842,50 +870,28 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst) * send a Call message with a Position Zero Read chunk and a * regular Read chunk at the same time. */ - if (rtype != rpcrdma_noch) { - ret = rpcrdma_encode_read_list(r_xprt, req, rqst, rtype); - if (ret) - goto out_err; - } - ret = encode_item_not_present(xdr); + ret = rpcrdma_encode_read_list(r_xprt, req, rqst, rtype); if (ret) goto out_err; - - if (wtype == rpcrdma_writech) { - ret = rpcrdma_encode_write_list(r_xprt, req, rqst, wtype); - if (ret) - goto out_err; - } - ret = encode_item_not_present(xdr); + ret = rpcrdma_encode_write_list(r_xprt, req, rqst, wtype); if (ret) goto out_err; - - if (wtype != rpcrdma_replych) - ret = encode_item_not_present(xdr); - else - ret = rpcrdma_encode_reply_chunk(r_xprt, req, rqst, wtype); + ret = rpcrdma_encode_reply_chunk(r_xprt, req, rqst, wtype); if (ret) goto out_err; - trace_xprtrdma_marshal(rqst, xdr_stream_pos(xdr), rtype, wtype); - - ret = rpcrdma_prepare_send_sges(r_xprt, req, xdr_stream_pos(xdr), + ret = rpcrdma_prepare_send_sges(r_xprt, req, req->rl_hdrbuf.len, &rqst->rq_snd_buf, rtype); if (ret) goto out_err; + + trace_xprtrdma_marshal(req, rtype, wtype); return 0; out_err: trace_xprtrdma_marshal_failed(rqst, ret); - switch (ret) { - case -EAGAIN: - xprt_wait_for_buffer_space(rqst->rq_xprt); - break; - case -ENOBUFS: - break; - default: - r_xprt->rx_stats.failed_marshal_count++; - } + r_xprt->rx_stats.failed_marshal_count++; + frwr_reset(req); return ret; } @@ -1269,51 +1275,17 @@ out_badheader: goto out; } -void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) -{ - /* Invalidate and unmap the data payloads before waking - * the waiting application. This guarantees the memory - * regions are properly fenced from the server before the - * application accesses the data. It also ensures proper - * send flow control: waking the next RPC waits until this - * RPC has relinquished all its Send Queue entries. - */ - if (!list_empty(&req->rl_registered)) - frwr_unmap_sync(r_xprt, &req->rl_registered); - - /* Ensure that any DMA mapped pages associated with - * the Send of the RPC Call have been unmapped before - * allowing the RPC to complete. This protects argument - * memory not controlled by the RPC client from being - * re-used before we're done with it. - */ - if (test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) { - r_xprt->rx_stats.reply_waits_for_send++; - out_of_line_wait_on_bit(&req->rl_flags, - RPCRDMA_REQ_F_TX_RESOURCES, - bit_wait, - TASK_UNINTERRUPTIBLE); - } -} - -/* Reply handling runs in the poll worker thread. Anything that - * might wait is deferred to a separate workqueue. - */ -void rpcrdma_deferred_completion(struct work_struct *work) +static void rpcrdma_reply_done(struct kref *kref) { - struct rpcrdma_rep *rep = - container_of(work, struct rpcrdma_rep, rr_work); - struct rpcrdma_req *req = rpcr_to_rdmar(rep->rr_rqst); - struct rpcrdma_xprt *r_xprt = rep->rr_rxprt; + struct rpcrdma_req *req = + container_of(kref, struct rpcrdma_req, rl_kref); - trace_xprtrdma_defer_cmp(rep); - if (rep->rr_wc_flags & IB_WC_WITH_INVALIDATE) - frwr_reminv(rep, &req->rl_registered); - rpcrdma_release_rqst(r_xprt, req); - rpcrdma_complete_rqst(rep); + rpcrdma_complete_rqst(req->rl_reply); } -/* Process received RPC/RDMA messages. +/** + * rpcrdma_reply_handler - Process received RPC/RDMA messages + * @rep: Incoming rpcrdma_rep object to process * * Errors must result in the RPC task either being awakened, or * allowed to timeout, to discover the errors at that time. @@ -1360,10 +1332,10 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep) else if (credits > buf->rb_max_requests) credits = buf->rb_max_requests; if (buf->rb_credits != credits) { - spin_lock_bh(&xprt->transport_lock); + spin_lock(&xprt->transport_lock); buf->rb_credits = credits; xprt->cwnd = credits << RPC_CWNDSHIFT; - spin_unlock_bh(&xprt->transport_lock); + spin_unlock(&xprt->transport_lock); } req = rpcr_to_rdmar(rqst); @@ -1373,10 +1345,16 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep) } req->rl_reply = rep; rep->rr_rqst = rqst; - clear_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags); trace_xprtrdma_reply(rqst->rq_task, rep, req, credits); - queue_work(buf->rb_completion_wq, &rep->rr_work); + + if (rep->rr_wc_flags & IB_WC_WITH_INVALIDATE) + frwr_reminv(rep, &req->rl_registered); + if (!list_empty(&req->rl_registered)) + frwr_unmap_async(r_xprt, req); + /* LocalInv completion will complete the RPC */ + else + kref_put(&req->rl_kref, rpcrdma_reply_done); return; out_badversion: |