From fcbeced5b4df5e7f05ed8a18b69acfac733aab11 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Tue, 13 Jan 2015 11:03:45 -0500 Subject: [PATCH] svcrdma: Move read list XDR round-up logic This is a pre-requisite for a subsequent patch. Read list XDR round-up needs to be done _before_ additional inline content is copied to the end of the XDR buffer's page list. Move the logic added by commit e560e3b510d2 ("svcrdma: Add zero padding if the client doesn't send it"). Signed-off-by: Chuck Lever Reviewed-by: Steve Wise Signed-off-by: J. Bruce Fields --- net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 37 ++++++------------------- 1 file changed, 9 insertions(+), 28 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index 36cf51a3eab7..a345cadad4dd 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; -- 2.20.1