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io_uring/net: don't skip notifs for failed requests 

We currently only add a notification CQE when the send succeded, i.e.
cqe.res >= 0. However, it'd be more robust to do buffer notifications
for failed requests as well in case drivers decide do something fanky.

Always return a buffer notification after initial prep, don't hide it.
This behaviour is better aligned with documentation and the patch also
helps the userspace to respect it.

Cc: stable@vger.kernel.org # 6.0
Suggested-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9c8bead87b2b980fcec441b8faef52188b4a6588.1664292100.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-09-28 00:51:49 +01:00 коммит произвёл Jens Axboe
Родитель c278d9f8ac
Коммит 6ae91ac9a6
1 изменённых файлов: 8 добавлений и 21 удалений
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29
io_uring/net.c
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@ -916,7 +916,6 @@ void io_send_zc_cleanup(struct io_kiocb *req)
kfree(io->free_iov);
}
if (zc->notif) {
zc->notif->flags |= REQ_F_CQE_SKIP;
io_notif_flush(zc->notif);
zc->notif = NULL;
}
@ -1047,7 +1046,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
struct msghdr msg;
struct iovec iov;
struct socket *sock;
unsigned msg_flags, cflags;
unsigned msg_flags;
int ret, min_ret = 0;
sock = sock_from_file(req->file);
@ -1115,8 +1114,6 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
req->flags |= REQ_F_PARTIAL_IO;
return io_setup_async_addr(req, &__address, issue_flags);
}
if (ret < 0 && !zc->done_io)
zc->notif->flags |= REQ_F_CQE_SKIP;
if (ret == -ERESTARTSYS)
ret = -EINTR;
req_set_fail(req);
@ -1129,8 +1126,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
io_notif_flush(zc->notif);
req->flags &= ~REQ_F_NEED_CLEANUP;
cflags = ret >= 0 ? IORING_CQE_F_MORE : 0;
io_req_set_res(req, ret, cflags);
io_req_set_res(req, ret, IORING_CQE_F_MORE);
return IOU_OK;
}
@ -1139,7 +1135,7 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
struct io_async_msghdr iomsg, *kmsg;
struct socket *sock;
unsigned flags, cflags;
unsigned flags;
int ret, min_ret = 0;
sock = sock_from_file(req->file);
@ -1178,8 +1174,6 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
req->flags |= REQ_F_PARTIAL_IO;
return io_setup_async_msg(req, kmsg, issue_flags);
}
if (ret < 0 && !sr->done_io)
sr->notif->flags |= REQ_F_CQE_SKIP;
if (ret == -ERESTARTSYS)
ret = -EINTR;
req_set_fail(req);
@ -1196,27 +1190,20 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
io_notif_flush(sr->notif);
req->flags &= ~REQ_F_NEED_CLEANUP;
cflags = ret >= 0 ? IORING_CQE_F_MORE : 0;
io_req_set_res(req, ret, cflags);
io_req_set_res(req, ret, IORING_CQE_F_MORE);
return IOU_OK;
}
void io_sendrecv_fail(struct io_kiocb *req)
{
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
int res = req->cqe.res;
if (req->flags & REQ_F_PARTIAL_IO)
res = sr->done_io;
req->cqe.res = sr->done_io;
if ((req->flags & REQ_F_NEED_CLEANUP) &&
(req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) {
/* preserve notification for partial I/O */
if (res < 0)
sr->notif->flags |= REQ_F_CQE_SKIP;
io_notif_flush(sr->notif);
sr->notif = NULL;
}
io_req_set_res(req, res, req->cqe.flags);
(req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC))
req->cqe.flags |= IORING_CQE_F_MORE;
}
int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)