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Miller" , Eric Dumazet , Paolo Abeni , Willem de Bruijn , David Ahern , Matthew Wilcox , Jens Axboe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Chuck Lever , Trond Myklebust , Anna Schumaker , Jeff Layton , linux-nfs@vger.kernel.org Subject: [PATCH net-next 3/6] sunrpc: Use sendmsg(MSG_SPLICE_PAGES) rather then sendpage Date: Fri, 9 Jun 2023 11:02:18 +0100 Message-ID: <20230609100221.2620633-4-dhowells@redhat.com> In-Reply-To: <20230609100221.2620633-1-dhowells@redhat.com> References: <20230609100221.2620633-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Rspamd-Queue-Id: 2378E14001D X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: 6s31ns8zaz5k8zy8pdormc4mdddqana5 X-HE-Tag: 1686304958-290847 X-HE-Meta: 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 W0+JsOF3 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When transmitting data, call down into TCP using sendmsg with MSG_SPLICE_PAGES to indicate that content should be spliced rather than performing sendpage calls to transmit header, data pages and trailer. Signed-off-by: David Howells Acked-by: Chuck Lever cc: Trond Myklebust cc: Anna Schumaker cc: Jeff Layton cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: linux-nfs@vger.kernel.org cc: netdev@vger.kernel.org --- include/linux/sunrpc/svc.h | 11 +++++------ net/sunrpc/svcsock.c | 38 ++++++++++++-------------------------- 2 files changed, 17 insertions(+), 32 deletions(-) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 762d7231e574..f66ec8fdb331 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -161,16 +161,15 @@ static inline bool svc_put_not_last(struct svc_serv *serv) extern u32 svc_max_payload(const struct svc_rqst *rqstp); /* - * RPC Requsts and replies are stored in one or more pages. + * RPC Requests and replies are stored in one or more pages. * We maintain an array of pages for each server thread. * Requests are copied into these pages as they arrive. Remaining * pages are available to write the reply into. * - * Pages are sent using ->sendpage so each server thread needs to - * allocate more to replace those used in sending. To help keep track - * of these pages we have a receive list where all pages initialy live, - * and a send list where pages are moved to when there are to be part - * of a reply. + * Pages are sent using ->sendmsg with MSG_SPLICE_PAGES so each server thread + * needs to allocate more to replace those used in sending. To help keep track + * of these pages we have a receive list where all pages initialy live, and a + * send list where pages are moved to when there are to be part of a reply. * * We use xdr_buf for holding responses as it fits well with NFS * read responses (that have a header, and some data pages, and possibly diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index f77cebe2c071..9d9f522e3ae1 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -1203,13 +1203,14 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec, int flags) { - return kernel_sendpage(sock, virt_to_page(vec->iov_base), - offset_in_page(vec->iov_base), - vec->iov_len, flags); + struct msghdr msg = { .msg_flags = MSG_SPLICE_PAGES | flags, }; + + iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, vec, 1, vec->iov_len); + return sock_sendmsg(sock, &msg); } /* - * kernel_sendpage() is used exclusively to reduce the number of + * MSG_SPLICE_PAGES is used exclusively to reduce the number of * copy operations in this path. Therefore the caller must ensure * that the pages backing @xdr are unchanging. * @@ -1249,28 +1250,13 @@ static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, if (ret != head->iov_len) goto out; - if (xdr->page_len) { - unsigned int offset, len, remaining; - struct bio_vec *bvec; - - bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT); - offset = offset_in_page(xdr->page_base); - remaining = xdr->page_len; - while (remaining > 0) { - len = min(remaining, bvec->bv_len - offset); - ret = kernel_sendpage(sock, bvec->bv_page, - bvec->bv_offset + offset, - len, 0); - if (ret < 0) - return ret; - *sentp += ret; - if (ret != len) - goto out; - remaining -= len; - offset = 0; - bvec++; - } - } + msg.msg_flags = MSG_SPLICE_PAGES; + iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, xdr->bvec, + xdr_buf_pagecount(xdr), xdr->page_len); + ret = sock_sendmsg(sock, &msg); + if (ret < 0) + return ret; + *sentp += ret; if (tail->iov_len) { ret = svc_tcp_send_kvec(sock, tail, 0);