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| author | David Howells <dhowells@redhat.com> | 2023-05-22 15:11:10 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-05-24 06:48:27 +0300 |
| commit | b841b901c452d92610f739a36e54978453528876 (patch) | |
| tree | d83c772ba708edabc53eefbc86a1bb15b4413d7c /include/linux/socket.h | |
| parent | 57910a47ffe993c2724a916b9e003d84ff0c0df7 (diff) | |
| download | linux-b841b901c452d92610f739a36e54978453528876.tar.xz | |
net: Declare MSG_SPLICE_PAGES internal sendmsg() flag
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 <dhowells@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/socket.h')
| -rw-r--r-- | include/linux/socket.h | 3 |
1 files changed, 3 insertions, 0 deletions
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 |