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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Willem de Bruijn , David Ahern , Matthew Wilcox , Al Viro , Christoph Hellwig , Jens Axboe , Jeff Layton , Christian Brauner , Chuck Lever III , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH net-next v6 16/18] udp: Convert udp_sendpage() to use MSG_SPLICE_PAGES Date: Tue, 11 Apr 2023 17:09:00 +0100 Message-Id: <20230411160902.4134381-17-dhowells@redhat.com> In-Reply-To: <20230411160902.4134381-1-dhowells@redhat.com> References: <20230411160902.4134381-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-Rspam-User: X-Rspamd-Queue-Id: 1562FC000B X-Rspamd-Server: rspam01 X-Stat-Signature: s7eprinuxyoo6gnjgyqbwc7osfui3d4q X-HE-Tag: 1681229404-623992 X-HE-Meta: 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 dpU5cl61 VsJr5fcbVC1cXkPKxa9kWdJKMyejjEQKYCeEh3CyzVY2KgZhrLX+J2A1g9TRGNn22kuMSs2RePhecPQaHHfDXzx56chD/QUNhtt/jvewGfzu4GZ5qbyPiW5tSUqXbO6pIUp9kvoDNPvYGf+lyVgSD4Lg5rsqYTxzjNbqJo0A/fM9K3k3nRAjJ0Q/w1BLbwX66b28/JeQ4A2XJkhQIaBl3CqaKjTpL9xyydM6/ilk73qjD6NRlI37JXJGMqqxuFo+qG4rQkcUjuME3zZIt8FaEA4Z+dfpPerS78Qrihfy5ioBoC7ZPomXElXCS+gQs8syMGlDmzHqxs2G7lLAwgiSulwjhxidE8AfwKaCCpKni5CHky3CmNm9lItKB9Fu+EgeFLjvBboCwVeIpHU5txpwcnOccSX3vCtxDdmQp7RAa30Ik4YpeMH2G4hwC1C1FiX74WPnPQWxFnBosOhMRPmpRy9NtEQCvZs3R5vozbObyKZWudn/6ex5GO5xV+xzQTrD6/1lyWlpdt+A8goJN+ESjtboFzA== 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: Convert udp_sendpage() to use sendmsg() with MSG_SPLICE_PAGES rather than directly splicing in the pages itself. This allows ->sendpage() to be replaced by something that can handle multiple multipage folios in a single transaction. Signed-off-by: David Howells cc: Willem de Bruijn cc: David Ahern cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- Notes: ver #6) - udp_sendpage() shouldn't lock the socket around udp_sendpage(). - udp_sendpage() should only set MSG_MORE if MSG_SENDPAGE_NOTLAST is set. net/ipv4/udp.c | 51 ++++++-------------------------------------------- 1 file changed, 6 insertions(+), 45 deletions(-) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index aa32afd871ee..2879dc6d66ea 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1332,54 +1332,15 @@ EXPORT_SYMBOL(udp_sendmsg); int udp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, int flags) { - struct inet_sock *inet = inet_sk(sk); - struct udp_sock *up = udp_sk(sk); - int ret; + struct bio_vec bvec; + struct msghdr msg = { .msg_flags = flags | MSG_SPLICE_PAGES }; if (flags & MSG_SENDPAGE_NOTLAST) - flags |= MSG_MORE; - - if (!up->pending) { - struct msghdr msg = { .msg_flags = flags|MSG_MORE }; - - /* Call udp_sendmsg to specify destination address which - * sendpage interface can't pass. - * This will succeed only when the socket is connected. - */ - ret = udp_sendmsg(sk, &msg, 0); - if (ret < 0) - return ret; - } - - lock_sock(sk); + msg.msg_flags |= MSG_MORE; - if (unlikely(!up->pending)) { - release_sock(sk); - - net_dbg_ratelimited("cork failed\n"); - return -EINVAL; - } - - ret = ip_append_page(sk, &inet->cork.fl.u.ip4, - page, offset, size, flags); - if (ret == -EOPNOTSUPP) { - release_sock(sk); - return sock_no_sendpage(sk->sk_socket, page, offset, - size, flags); - } - if (ret < 0) { - udp_flush_pending_frames(sk); - goto out; - } - - up->len += size; - if (!(READ_ONCE(up->corkflag) || (flags&MSG_MORE))) - ret = udp_push_pending_frames(sk); - if (!ret) - ret = size; -out: - release_sock(sk); - return ret; + bvec_set_page(&bvec, page, size, offset); + iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size); + return udp_sendmsg(sk, &msg, size); } #define UDP_SKB_IS_STATELESS 0x80000000