Return-Path: Received: from mail-io0-f194.google.com ([209.85.223.194]:37022 "EHLO mail-io0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728072AbeIJUD4 (ORCPT ); Mon, 10 Sep 2018 16:03:56 -0400 Subject: [PATCH v1 05/22] xprtrdma: Refactor chunk encoding From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 10 Sep 2018 11:09:22 -0400 Message-ID: <20180910150922.10564.50999.stgit@manet.1015granger.net> In-Reply-To: <20180910150040.10564.97487.stgit@manet.1015granger.net> References: <20180910150040.10564.97487.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: Move the "not present" case into the individual chunk encoders. This improves code organization and readability, and prepares the marsh- aling code path for handling cases like "Write + Reply". The reason for the original organization was to optimize this code path for the case where there there are no chunks. The optimization was inconsequential. Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/rpc_rdma.c | 37 ++++++++++++++++--------------------- 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index ec4b1f9..39996df 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -346,6 +346,9 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, 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; @@ -370,7 +373,8 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, 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 @@ -398,6 +402,9 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, 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, @@ -433,7 +440,8 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, /* 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 @@ -458,6 +466,9 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, 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) @@ -828,31 +839,15 @@ static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt, * 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),