diff options
| -rw-r--r-- | include/linux/sunrpc/svc_rdma.h | 3 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 36 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 61 |
3 files changed, 62 insertions, 38 deletions
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 287db5c179d8..002a46d1faa1 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -228,6 +228,9 @@ extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *, /* svc_rdma_sendto.c */ extern int svc_rdma_map_xdr(struct svcxprt_rdma *, struct xdr_buf *, struct svc_rdma_req_map *, bool); +extern int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma, + struct svc_rdma_op_ctxt *ctxt, + __be32 *rdma_resp, unsigned int len); extern int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma, struct svc_rdma_op_ctxt *ctxt, int num_sge, u32 inv_rkey); diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index f12f39c189c3..0305b33d482f 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -101,50 +101,36 @@ out_notfound: static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma, struct rpc_rqst *rqst) { - struct xdr_buf *sndbuf = &rqst->rq_snd_buf; struct svc_rdma_op_ctxt *ctxt; - struct svc_rdma_req_map *vec; int ret; - vec = svc_rdma_get_req_map(rdma); - ret = svc_rdma_map_xdr(rdma, sndbuf, vec, false); - if (ret) + ctxt = svc_rdma_get_context(rdma); + + /* rpcrdma_bc_send_request builds the transport header and + * the backchannel RPC message in the same buffer. Thus only + * one SGE is needed to send both. + */ + ret = svc_rdma_map_reply_hdr(rdma, ctxt, rqst->rq_buffer, + rqst->rq_snd_buf.len); + if (ret < 0) goto out_err; ret = svc_rdma_repost_recv(rdma, GFP_NOIO); if (ret) goto out_err; - ctxt = svc_rdma_get_context(rdma); - ctxt->pages[0] = virt_to_page(rqst->rq_buffer); - ctxt->count = 1; - - ctxt->direction = DMA_TO_DEVICE; - ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey; - ctxt->sge[0].length = sndbuf->len; - ctxt->sge[0].addr = - ib_dma_map_page(rdma->sc_cm_id->device, ctxt->pages[0], 0, - sndbuf->len, DMA_TO_DEVICE); - if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr)) { - ret = -EIO; - goto out_unmap; - } - svc_rdma_count_mappings(rdma, ctxt); - ret = svc_rdma_post_send_wr(rdma, ctxt, 1, 0); - if (ret) { - ret = -EIO; + if (ret) goto out_unmap; - } out_err: - svc_rdma_put_req_map(rdma, vec); dprintk("svcrdma: %s returns %d\n", __func__, ret); return ret; out_unmap: svc_rdma_unmap_dma(ctxt); svc_rdma_put_context(ctxt, 1); + ret = -EIO; goto out_err; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index f90b40d0932f..a7dc71daa776 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -217,6 +217,49 @@ static u32 svc_rdma_get_inv_rkey(struct rpcrdma_msg *rdma_argp, return 0; } +static int svc_rdma_dma_map_page(struct svcxprt_rdma *rdma, + struct svc_rdma_op_ctxt *ctxt, + unsigned int sge_no, + struct page *page, + unsigned int offset, + unsigned int len) +{ + struct ib_device *dev = rdma->sc_cm_id->device; + dma_addr_t dma_addr; + + dma_addr = ib_dma_map_page(dev, page, offset, len, DMA_TO_DEVICE); + if (ib_dma_mapping_error(dev, dma_addr)) + return -EIO; + + ctxt->sge[sge_no].addr = dma_addr; + ctxt->sge[sge_no].length = len; + ctxt->sge[sge_no].lkey = rdma->sc_pd->local_dma_lkey; + svc_rdma_count_mappings(rdma, ctxt); + return 0; +} + +/** + * svc_rdma_map_reply_hdr - DMA map the transport header buffer + * @rdma: controlling transport + * @ctxt: op_ctxt for the Send WR + * @rdma_resp: buffer containing transport header + * @len: length of transport header + * + * Returns: + * %0 if the header is DMA mapped, + * %-EIO if DMA mapping failed. + */ +int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma, + struct svc_rdma_op_ctxt *ctxt, + __be32 *rdma_resp, + unsigned int len) +{ + ctxt->direction = DMA_TO_DEVICE; + ctxt->pages[0] = virt_to_page(rdma_resp); + ctxt->count = 1; + return svc_rdma_dma_map_page(rdma, ctxt, 0, ctxt->pages[0], 0, len); +} + /* Assumptions: * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE */ @@ -699,22 +742,14 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp, err = ERR_VERS; length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va); + /* Map transport header; no RPC message payload */ ctxt = svc_rdma_get_context(xprt); - ctxt->direction = DMA_TO_DEVICE; - ctxt->count = 1; - ctxt->pages[0] = p; - - /* Prepare SGE for local address */ - ctxt->sge[0].lkey = xprt->sc_pd->local_dma_lkey; - ctxt->sge[0].length = length; - ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device, - p, 0, length, DMA_TO_DEVICE); - if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) { - dprintk("svcrdma: Error mapping buffer for protocol error\n"); - svc_rdma_put_context(ctxt, 1); + ret = svc_rdma_map_reply_hdr(xprt, ctxt, &rmsgp->rm_xid, length); + if (ret) { + dprintk("svcrdma: Error %d mapping send for protocol error\n", + ret); return; } - svc_rdma_count_mappings(xprt, ctxt); ret = svc_rdma_post_send_wr(xprt, ctxt, 1, 0); if (ret) { |