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Wed, 7 Jun 2023 15:54:32 +0000 Received: from 88665a182662.ant.amazon.com (10.119.185.127) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 7 Jun 2023 15:54:28 +0000 From: Kuniyuki Iwashima To: CC: , , , , , , , , , , , , , , , Subject: Re: [PATCH net-next v5 07/14] ipv4, ipv6: Use splice_eof() to flush Date: Wed, 7 Jun 2023 08:54:20 -0700 Message-ID: <20230607155420.11462-1-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <2269950.1686152632@warthog.procyon.org.uk> References: <2269950.1686152632@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.119.185.127] X-ClientProxiedBy: EX19D032UWA001.ant.amazon.com (10.13.139.62) To EX19D004ANA001.ant.amazon.com (10.37.240.138) X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 911D9C0008 X-Stat-Signature: ex77yq4iu8zbq3s9eh5jzs18mdc3gkrf X-HE-Bulk: true X-HE-Tag: 1686153287-554426 X-HE-Meta: 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 3LP+ZZE0 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 WcRlaTjD 9CgNWBUndnvycY/en6FSLhaxeZOAMtuyYf260+p/Cxs= 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: From: David Howells Date: Wed, 07 Jun 2023 16:43:52 +0100 > Kuniyuki Iwashima wrote: > > > > + /* IPV6_ADDRFORM can change sk->sk_prot under us. */ > > > + prot = READ_ONCE(sk->sk_prot); > > > + if (prot->splice_eof) > > > + sk->sk_prot->splice_eof(sock); > > > > We need to use prot here. > > Yeah. > > > > + if (up->pending == AF_INET) > > > + udp_splice_eof(sock); > > > > Do we need this ? > > Actually, no. udp_v6_push_pending_frames() will do this. > > > > + lock_sock(sk); > > > + if (up->pending && !READ_ONCE(up->corkflag)) > > > + udp_push_pending_frames(sk); > > > > We should use udp_v6_push_pending_frames(sk) as up->pending > > could be AF_INET even after the test above. > > Yeah. > > Updated version attached for your perusal (I will post a v6 too). > > David > --- > commit 8b95b9cd654835eb2ff1ad24cd6de802836c4062 > Author: David Howells > Date: Wed Jun 7 14:44:34 2023 +0100 > > ipv4, ipv6: Use splice_eof() to flush > > Allow splice to undo the effects of MSG_MORE after prematurely ending a > splice/sendfile due to getting an EOF condition (->splice_read() returned > 0) after splice had called sendmsg() with MSG_MORE set when the user didn't > set MSG_MORE. > > For UDP, a pending packet will not be emitted if the socket is closed > before it is flushed; with this change, it be flushed by ->splice_eof(). > > For TCP, it's not clear that MSG_MORE is actually effective. > > Suggested-by: Linus Torvalds > Link: https://lore.kernel.org/r/CAHk-=wh=V579PDYvkpnTobCLGczbgxpMgGmmhqiTyE34Cpi5Gg@mail.gmail.com/ > Signed-off-by: David Howells > cc: Kuniyuki Iwashima > cc: Eric Dumazet > cc: Willem de Bruijn > cc: David Ahern > cc: "David S. Miller" > cc: Jakub Kicinski > cc: Paolo Abeni > cc: Jens Axboe > cc: Matthew Wilcox > cc: netdev@vger.kernel.org > > Notes: > ver #6) > - In inet_splice_eof(), use prot after deref of sk->sk_prot. > - In udpv6_splice_eof(), use udp_v6_push_pending_frames(). You missed this change ;) > - In udpv6_splice_eof(), don't check for AF_INET. > > diff --git a/include/net/inet_common.h b/include/net/inet_common.h > index 77f4b0ef5b92..a75333342c4e 100644 > --- a/include/net/inet_common.h > +++ b/include/net/inet_common.h > @@ -35,6 +35,7 @@ void __inet_accept(struct socket *sock, struct socket *newsock, > struct sock *newsk); > int inet_send_prepare(struct sock *sk); > int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); > +void inet_splice_eof(struct socket *sock); > ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, > size_t size, int flags); > int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, > diff --git a/include/net/tcp.h b/include/net/tcp.h > index 68990a8f556a..49611af31bb7 100644 > --- a/include/net/tcp.h > +++ b/include/net/tcp.h > @@ -327,6 +327,7 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); > int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size); > int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, int *copied, > size_t size, struct ubuf_info *uarg); > +void tcp_splice_eof(struct socket *sock); > int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, > int flags); > int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, > diff --git a/include/net/udp.h b/include/net/udp.h > index 5cad44318d71..4ed0b47c5582 100644 > --- a/include/net/udp.h > +++ b/include/net/udp.h > @@ -278,6 +278,7 @@ int udp_get_port(struct sock *sk, unsigned short snum, > int udp_err(struct sk_buff *, u32); > int udp_abort(struct sock *sk, int err); > int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); > +void udp_splice_eof(struct socket *sock); > int udp_push_pending_frames(struct sock *sk); > void udp_flush_pending_frames(struct sock *sk); > int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size); > diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c > index b5735b3551cf..fd233c4195ac 100644 > --- a/net/ipv4/af_inet.c > +++ b/net/ipv4/af_inet.c > @@ -831,6 +831,21 @@ int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) > } > EXPORT_SYMBOL(inet_sendmsg); > > +void inet_splice_eof(struct socket *sock) > +{ > + const struct proto *prot; > + struct sock *sk = sock->sk; > + > + if (unlikely(inet_send_prepare(sk))) > + return; > + > + /* IPV6_ADDRFORM can change sk->sk_prot under us. */ > + prot = READ_ONCE(sk->sk_prot); > + if (prot->splice_eof) > + prot->splice_eof(sock); > +} > +EXPORT_SYMBOL_GPL(inet_splice_eof); > + > ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, > size_t size, int flags) > { > @@ -1050,6 +1065,7 @@ const struct proto_ops inet_stream_ops = { > #ifdef CONFIG_MMU > .mmap = tcp_mmap, > #endif > + .splice_eof = inet_splice_eof, > .sendpage = inet_sendpage, > .splice_read = tcp_splice_read, > .read_sock = tcp_read_sock, > @@ -1084,6 +1100,7 @@ const struct proto_ops inet_dgram_ops = { > .read_skb = udp_read_skb, > .recvmsg = inet_recvmsg, > .mmap = sock_no_mmap, > + .splice_eof = inet_splice_eof, > .sendpage = inet_sendpage, > .set_peek_off = sk_set_peek_off, > #ifdef CONFIG_COMPAT > @@ -1115,6 +1132,7 @@ static const struct proto_ops inet_sockraw_ops = { > .sendmsg = inet_sendmsg, > .recvmsg = inet_recvmsg, > .mmap = sock_no_mmap, > + .splice_eof = inet_splice_eof, > .sendpage = inet_sendpage, > #ifdef CONFIG_COMPAT > .compat_ioctl = inet_compat_ioctl, > diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c > index 53b7751b68e1..09f03221a6f1 100644 > --- a/net/ipv4/tcp.c > +++ b/net/ipv4/tcp.c > @@ -1371,6 +1371,22 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) > } > EXPORT_SYMBOL(tcp_sendmsg); > > +void tcp_splice_eof(struct socket *sock) > +{ > + struct sock *sk = sock->sk; > + struct tcp_sock *tp = tcp_sk(sk); > + int mss_now, size_goal; > + > + if (!tcp_write_queue_tail(sk)) > + return; > + > + lock_sock(sk); > + mss_now = tcp_send_mss(sk, &size_goal, 0); > + tcp_push(sk, 0, mss_now, tp->nonagle, size_goal); > + release_sock(sk); > +} > +EXPORT_SYMBOL_GPL(tcp_splice_eof); > + > /* > * Handle reading urgent data. BSD has very simple semantics for > * this, no blocking and very strange errors 8) > diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c > index 53e9ce2f05bb..84a5d557dc1a 100644 > --- a/net/ipv4/tcp_ipv4.c > +++ b/net/ipv4/tcp_ipv4.c > @@ -3116,6 +3116,7 @@ struct proto tcp_prot = { > .keepalive = tcp_set_keepalive, > .recvmsg = tcp_recvmsg, > .sendmsg = tcp_sendmsg, > + .splice_eof = tcp_splice_eof, > .sendpage = tcp_sendpage, > .backlog_rcv = tcp_v4_do_rcv, > .release_cb = tcp_release_cb, > diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c > index fd3dae081f3a..df5e407286d7 100644 > --- a/net/ipv4/udp.c > +++ b/net/ipv4/udp.c > @@ -1324,6 +1324,21 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) > } > EXPORT_SYMBOL(udp_sendmsg); > > +void udp_splice_eof(struct socket *sock) > +{ > + struct sock *sk = sock->sk; > + struct udp_sock *up = udp_sk(sk); > + > + if (!up->pending || READ_ONCE(up->corkflag)) > + return; > + > + lock_sock(sk); > + if (up->pending && !READ_ONCE(up->corkflag)) > + udp_push_pending_frames(sk); > + release_sock(sk); > +} > +EXPORT_SYMBOL_GPL(udp_splice_eof); > + > int udp_sendpage(struct sock *sk, struct page *page, int offset, > size_t size, int flags) > { > @@ -2918,6 +2933,7 @@ struct proto udp_prot = { > .getsockopt = udp_getsockopt, > .sendmsg = udp_sendmsg, > .recvmsg = udp_recvmsg, > + .splice_eof = udp_splice_eof, > .sendpage = udp_sendpage, > .release_cb = ip4_datagram_release_cb, > .hash = udp_lib_hash, > diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c > index 2bbf13216a3d..564942bee067 100644 > --- a/net/ipv6/af_inet6.c > +++ b/net/ipv6/af_inet6.c > @@ -695,6 +695,7 @@ const struct proto_ops inet6_stream_ops = { > #ifdef CONFIG_MMU > .mmap = tcp_mmap, > #endif > + .splice_eof = inet_splice_eof, > .sendpage = inet_sendpage, > .sendmsg_locked = tcp_sendmsg_locked, > .sendpage_locked = tcp_sendpage_locked, > diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c > index d657713d1c71..c17c8ff94b79 100644 > --- a/net/ipv6/tcp_ipv6.c > +++ b/net/ipv6/tcp_ipv6.c > @@ -2150,6 +2150,7 @@ struct proto tcpv6_prot = { > .keepalive = tcp_set_keepalive, > .recvmsg = tcp_recvmsg, > .sendmsg = tcp_sendmsg, > + .splice_eof = tcp_splice_eof, > .sendpage = tcp_sendpage, > .backlog_rcv = tcp_v6_do_rcv, > .release_cb = tcp_release_cb, > diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c > index e5a337e6b970..3a592dc129e9 100644 > --- a/net/ipv6/udp.c > +++ b/net/ipv6/udp.c > @@ -1653,6 +1653,20 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) > } > EXPORT_SYMBOL(udpv6_sendmsg); > > +static void udpv6_splice_eof(struct socket *sock) > +{ > + struct sock *sk = sock->sk; > + struct udp_sock *up = udp_sk(sk); > + > + if (!up->pending || READ_ONCE(up->corkflag)) > + return; > + > + lock_sock(sk); > + if (up->pending && !READ_ONCE(up->corkflag)) > + udp_push_pending_frames(sk); > + release_sock(sk); > +} > + > void udpv6_destroy_sock(struct sock *sk) > { > struct udp_sock *up = udp_sk(sk); > @@ -1764,6 +1778,7 @@ struct proto udpv6_prot = { > .getsockopt = udpv6_getsockopt, > .sendmsg = udpv6_sendmsg, > .recvmsg = udpv6_recvmsg, > + .splice_eof = udpv6_splice_eof, > .release_cb = ip6_datagram_release_cb, > .hash = udp_lib_hash, > .unhash = udp_lib_unhash,