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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, Willem de Bruijn Subject: [PATCH net-next v6 01/18] net: Declare MSG_SPLICE_PAGES internal sendmsg() flag Date: Tue, 11 Apr 2023 17:08:45 +0100 Message-Id: <20230411160902.4134381-2-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 10.11.54.1 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 67627C002B X-Stat-Signature: a4yybqkokhptu9xosjnw4so64buhsk5z X-HE-Tag: 1681229355-283497 X-HE-Meta: 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 Sw8WOwu/ 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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: Declare MSG_SPLICE_PAGES, an internal sendmsg() flag, that hints to a network protocol that it should splice pages from the source iterator rather than copying the data if it can. This flag is added to a list that is cleared by sendmsg syscalls on entry. This is intended as a replacement for the ->sendpage() op, allowing a way to splice in several multipage folios in one go. Signed-off-by: David Howells Reviewed-by: Willem de Bruijn cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- include/linux/socket.h | 3 +++ net/socket.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/include/linux/socket.h b/include/linux/socket.h index 13c3a237b9c9..bd1cc3238851 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -327,6 +327,7 @@ struct ucred { */ #define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */ +#define MSG_SPLICE_PAGES 0x8000000 /* Splice the pages from the iterator in sendmsg() */ #define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */ #define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file descriptor received through @@ -337,6 +338,8 @@ struct ucred { #define MSG_CMSG_COMPAT 0 /* We never have 32 bit fixups */ #endif +/* Flags to be cleared on entry by sendmsg and sendmmsg syscalls */ +#define MSG_INTERNAL_SENDMSG_FLAGS (MSG_SPLICE_PAGES) /* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */ #define SOL_IP 0 diff --git a/net/socket.c b/net/socket.c index 73e493da4589..b3fd3f7f7e03 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2136,6 +2136,7 @@ int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, msg.msg_name = (struct sockaddr *)&address; msg.msg_namelen = addr_len; } + flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; msg.msg_flags = flags; @@ -2483,6 +2484,7 @@ static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, } msg_sys->msg_flags = flags; + flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; if (sock->file->f_flags & O_NONBLOCK) msg_sys->msg_flags |= MSG_DONTWAIT; /*