netdev - [RFC PATCH 08/28] siw: Inline do_tcp

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Message-Id: <20230316152618.711970-9-dhowells@redhat.com>
Date:   Thu, 16 Mar 2023 15:25:58 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Tom Talpey <tom@...pey.com>, linux-rdma@...r.kernel.org
Subject: [RFC PATCH 08/28] siw: Inline do_tcp_sendpages()

do_tcp_sendpages() is now just a small wrapper around tcp_sendmsg_locked(),
so inline it, allowing do_tcp_sendpages() to be removed.  This is part of
replacing ->sendpage() with a call to sendmsg() with MSG_SPLICE_PAGES set.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Bernard Metzler <bmt@...ich.ibm.com>
cc: Tom Talpey <tom@...pey.com>
cc: "David S. Miller" <davem@...emloft.net>
cc: Eric Dumazet <edumazet@...gle.com>
cc: Jakub Kicinski <kuba@...nel.org>
cc: Paolo Abeni <pabeni@...hat.com>
cc: Jens Axboe <axboe@...nel.dk>
cc: Matthew Wilcox <willy@...radead.org>
cc: linux-rdma@...r.kernel.org
cc: netdev@...r.kernel.org
---
 drivers/infiniband/sw/siw/siw_qp_tx.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index 05052b49107f..8fc179321e2b 100644
--- a/drivers/infiniband/sw/siw/siw_qp_tx.c
+++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
@@ -313,7 +313,7 @@ static int siw_tx_ctrl(struct siw_iwarp_tx *c_tx, struct socket *s,
 }
 
 /*
- * 0copy TCP transmit interface: Use do_tcp_sendpages.
+ * 0copy TCP transmit interface: Use MSG_SPLICE_PAGES.
  *
  * Using sendpage to push page by page appears to be less efficient
  * than using sendmsg, even if data are copied.
@@ -324,20 +324,27 @@ static int siw_tx_ctrl(struct siw_iwarp_tx *c_tx, struct socket *s,
 static int siw_tcp_sendpages(struct socket *s, struct page **page, int offset,
 			     size_t size)
 {
+	struct bio_vec bvec;
+	struct msghdr msg = {
+		.msg_flags = (MSG_SPLICE_PAGES | MSG_MORE | MSG_DONTWAIT |
+			      MSG_SENDPAGE_NOTLAST),
+	};
 	struct sock *sk = s->sk;
-	int i = 0, rv = 0, sent = 0,
-	    flags = MSG_MORE | MSG_DONTWAIT | MSG_SENDPAGE_NOTLAST;
+	int i = 0, rv = 0, sent = 0;
 
 	while (size) {
 		size_t bytes = min_t(size_t, PAGE_SIZE - offset, size);
 
 		if (size + offset <= PAGE_SIZE)
-			flags = MSG_MORE | MSG_DONTWAIT;
+			msg.msg_flags = MSG_SPLICE_PAGES | MSG_MORE | MSG_DONTWAIT;
 
 		tcp_rate_check_app_limited(sk);
+		bvec_set_page(&bvec, page[i], bytes, offset);
+		iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
+
 try_page_again:
 		lock_sock(sk);
-		rv = do_tcp_sendpages(sk, page[i], offset, bytes, flags);
+		rv = tcp_sendmsg_locked(sk, &msg, size);
 		release_sock(sk);
 
 		if (rv > 0) {