Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ig0-f180.google.com ([209.85.213.180]:39317 "EHLO mail-ig0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752465AbbAITXN (ORCPT ); Fri, 9 Jan 2015 14:23:13 -0500 From: Chuck Lever Subject: [PATCH v1 09/10] Move read list XDR round-up logic To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Fri, 09 Jan 2015 14:23:11 -0500 Message-ID: <20150109192310.4901.62851.stgit@klimt.1015granger.net> In-Reply-To: <20150109191910.4901.29548.stgit@klimt.1015granger.net> References: <20150109191910.4901.29548.stgit@klimt.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: Simpler approach, and this needs to be done before the tail is copied to the end of the read list (pre-requisite for a subsequent patch). Fixes: e560e3b510d2 ("svcrdma: Add zero padding if the client... ") Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 37 ++++++++----------------------- 1 files changed, 9 insertions(+), 28 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index 36cf51a..a345cad 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -43,7 +43,6 @@ #include #include #include -#include #include #include #include @@ -434,6 +433,15 @@ static int rdma_read_chunks(struct svcxprt_rdma *xprt, } } + /* Read list may need XDR round-up (see RFC 5666, s. 3.7) */ + if (page_offset & 3) { + u32 pad = 4 - (page_offset & 3); + + head->arg.page_len += pad; + head->arg.len += pad; + head->arg.buflen += pad; + } + ret = 1; head->position = position; @@ -446,32 +454,6 @@ static int rdma_read_chunks(struct svcxprt_rdma *xprt, return ret; } -/* - * To avoid a separate RDMA READ just for a handful of zero bytes, - * RFC 5666 section 3.7 allows the client to omit the XDR zero pad - * in chunk lists. - */ -static void -rdma_fix_xdr_pad(struct xdr_buf *buf) -{ - unsigned int page_len = buf->page_len; - unsigned int size = (XDR_QUADLEN(page_len) << 2) - page_len; - unsigned int offset, pg_no; - char *p; - - if (size == 0) - return; - - pg_no = page_len >> PAGE_SHIFT; - offset = page_len & ~PAGE_MASK; - p = page_address(buf->pages[pg_no]); - memset(p + offset, 0, size); - - buf->page_len += size; - buf->buflen += size; - buf->len += size; -} - static int rdma_read_complete(struct svc_rqst *rqstp, struct svc_rdma_op_ctxt *head) { @@ -499,7 +481,6 @@ static int rdma_read_complete(struct svc_rqst *rqstp, } /* Point rq_arg.pages past header */ - rdma_fix_xdr_pad(&head->arg); rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count]; rqstp->rq_arg.page_len = head->arg.page_len; rqstp->rq_arg.page_base = head->arg.page_base;