Messages in this thread | | | From | Ammar Faizi <> | Subject | [RFC PATCH v1 0/3] io_uring: Add sendto(2) and recvfrom(2) support | Date | Thu, 30 Dec 2021 08:35:40 +0700 |
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Hello,
This RFC patchset adds sendto(2) and recvfrom(2) support for io_uring. It also addresses an issue in the liburing GitHub repository [1].
## Motivations: 1) By using `sendto()` and `recvfrom()` we can make the submission simpler compared to always using `sendmsg()` and `recvmsg()` from the userspace.
2) There is a historical patch that tried to add the same functionality, but did not end up being applied. [2]
On Tue, 7 Jul 2020 12:29:18 -0600, Jens Axboe <axboe@kernel.dk> wrote: > In a private conversation with the author, a good point was brought > up that the sendto/recvfrom do not require an allocation of an async > context, if we need to defer or go async with the request. I think > that's a major win, to be honest. There are other benefits as well > (like shorter path), but to me, the async less part is nice and will > reduce overhead
## Changes summary There are 3 patches in this series.
PATCH 1/3 renames io_recv to io_recvfrom and io_send to io_sendto. Note that
send(sockfd, buf, len, flags);
is equivalent to
sendto(sockfd, buf, len, flags, NULL, 0);
and recv(sockfd, buf, len, flags);
is equivalent to
recvfrom(sockfd, buf, len, flags, NULL, NULL);
So it is saner to have `send` and `recv` directed to `sendto` and `recvfrom` instead of the opposite with respect to the name.
PATCH 2/3 makes `move_addr_to_user()` be a non static function. This function lives in net/socket.c, we need to call this from io_uring to add `recvfrom()` support for liburing. Added net files maintainers to the CC list.
PATCH 3/3 adds `sendto(2)` and `recvfrom(2)` support for io_uring. Added two new opcodes: IORING_OP_SENDTO and IORING_OP_RECVFROM.
## How to test
This patchset is based on "for-next" branch commit:
aafc6e6eba29c890b0031267fc37c43490447c81 ("Merge branch 'for-5.17/io_uring' into for-next")
It is also available in the Git repository at:
https://github.com/ammarfaizi2/linux-block ammarfaizi2/linux-block/io_uring-recvfrom-sendto
I also added the liburing support and test. The liburing support is based on "xattr-getdents64" branch commit:
18d71076f6c97e1b25aa0e3b0e12a913ec4717fa ("src/include/liburing.h: style cleanups")
It is available in the Git repository at:
https://github.com/ammarfaizi2/liburing sendto-recvfrom
Link: https://github.com/axboe/liburing/issues/397 [1] Link: https://lore.kernel.org/io-uring/a2399c89-2c45-375c-7395-b5caf556ec3d@kernel.dk/ [2] Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: netdev@vger.kernel.org Signed-off-by: Ammar Faizi <ammarfaizi2@gmail.com> --- Ammar Faizi (3): io_uring: Rename `io_{send,recv}` to `io_{sendto,recvfrom}` net: Make `move_addr_to_user()` be a non static function io_uring: Add `sendto(2)` and `recvfrom(2)` support
fs/io_uring.c | 88 +++++++++++++++++++++++++++++++---- include/linux/socket.h | 2 + include/uapi/linux/io_uring.h | 2 + net/socket.c | 4 +- 4 files changed, 86 insertions(+), 10 deletions(-)
base-commit: aafc6e6eba29c890b0031267fc37c43490447c81 -- Ammar Faizi
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