From c6f32c7d9e09bf1368447e9a29e869193ecbb756 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 18 Mar 2024 07:36:03 -0600
Subject: [PATCH] io_uring/net: get rid of ->prep_async() for receive side
Move the io_async_msghdr out of the issue path and into prep handling,
since it's now done unconditionally and hence does not need to be part
of the issue path. This reduces the footprint of the multishot fast
path of multiple invocations of ->issue() per prep, and also means that
using ->prep_async() can be dropped for recvmsg asthis is now done via
setup on the prep side.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
io_uring/net.c | 71 +++++++++++++++++++-----------------------------
io_uring/net.h | 1 -
io_uring/opdef.c | 2 --
3 files changed, 28 insertions(+), 46 deletions(-)
diff --git a/io_uring/net.c b/io_uring/net.c
index b08c0ae5951ae..7cd93cd8b8c47 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -595,17 +595,36 @@ static int io_recvmsg_copy_hdr(struct io_kiocb *req,
msg.msg_controllen);
}
-int io_recvmsg_prep_async(struct io_kiocb *req)
+static int io_recvmsg_prep_setup(struct io_kiocb *req)
{
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
- struct io_async_msghdr *iomsg;
+ struct io_async_msghdr *kmsg;
int ret;
- sr->done_io = 0;
- if (!io_msg_alloc_async_prep(req))
+ /* always locked for prep */
+ kmsg = io_msg_alloc_async(req, 0);
+ if (unlikely(!kmsg))
return -ENOMEM;
- iomsg = req->async_data;
- ret = io_recvmsg_copy_hdr(req, iomsg);
+
+ if (req->opcode == IORING_OP_RECV) {
+ kmsg->msg.msg_name = NULL;
+ kmsg->msg.msg_namelen = 0;
+ kmsg->msg.msg_control = NULL;
+ kmsg->msg.msg_get_inq = 1;
+ kmsg->msg.msg_controllen = 0;
+ kmsg->msg.msg_iocb = NULL;
+ kmsg->msg.msg_ubuf = NULL;
+
+ if (!io_do_buffer_select(req)) {
+ ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
+ &kmsg->msg.msg_iter);
+ if (unlikely(ret))
+ return ret;
+ }
+ return 0;
+ }
+
+ ret = io_recvmsg_copy_hdr(req, kmsg);
if (!ret)
req->flags |= REQ_F_NEED_CLEANUP;
return ret;
@@ -656,7 +675,7 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sr->msg_flags |= MSG_CMSG_COMPAT;
#endif
sr->nr_multishot_loops = 0;
- return 0;
+ return io_recvmsg_prep_setup(req);
}
static inline void io_recv_prep_retry(struct io_kiocb *req,
@@ -814,7 +833,7 @@ static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
int io_recvmsg(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 *kmsg;
+ struct io_async_msghdr *kmsg = req->async_data;
struct socket *sock;
unsigned flags;
int ret, min_ret = 0;
@@ -825,17 +844,6 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
if (unlikely(!sock))
return -ENOTSOCK;
- if (req_has_async_data(req)) {
- kmsg = req->async_data;
- } else {
- kmsg = io_msg_alloc_async(req, issue_flags);
- if (unlikely(!kmsg))
- return -ENOMEM;
- ret = io_recvmsg_copy_hdr(req, kmsg);
- if (ret)
- return ret;
- }
-
if (!(req->flags & REQ_F_POLLED) &&
(sr->flags & IORING_RECVSEND_POLL_FIRST))
return -EAGAIN;
@@ -914,36 +922,13 @@ retry_multishot:
int io_recv(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 *kmsg;
+ struct io_async_msghdr *kmsg = req->async_data;
struct socket *sock;
unsigned flags;
int ret, min_ret = 0;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
size_t len = sr->len;
- if (req_has_async_data(req)) {
- kmsg = req->async_data;
- } else {
- kmsg = io_msg_alloc_async(req, issue_flags);
- if (unlikely(!kmsg))
- return -ENOMEM;
- kmsg->free_iov = NULL;
- kmsg->msg.msg_name = NULL;
- kmsg->msg.msg_namelen = 0;
- kmsg->msg.msg_control = NULL;
- kmsg->msg.msg_get_inq = 1;
- kmsg->msg.msg_controllen = 0;
- kmsg->msg.msg_iocb = NULL;
- kmsg->msg.msg_ubuf = NULL;
-
- if (!io_do_buffer_select(req)) {
- ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
- &kmsg->msg.msg_iter);
- if (unlikely(ret))
- return ret;
- }
- }
-
if (!(req->flags & REQ_F_POLLED) &&
(sr->flags & IORING_RECVSEND_POLL_FIRST))
return -EAGAIN;
diff --git a/io_uring/net.h b/io_uring/net.h
index 5c1230f1aaf98..4b4fd9b1b7b4b 100644
--- a/io_uring/net.h
+++ b/io_uring/net.h
@@ -42,7 +42,6 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags);
int io_send(struct io_kiocb *req, unsigned int issue_flags);
int io_sendrecv_prep_async(struct io_kiocb *req);
-int io_recvmsg_prep_async(struct io_kiocb *req);
int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags);
int io_recv(struct io_kiocb *req, unsigned int issue_flags);
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 77131826d6039..1368193edc572 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -536,7 +536,6 @@ const struct io_cold_def io_cold_defs[] = {
.name = "RECVMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
- .prep_async = io_recvmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
@@ -613,7 +612,6 @@ const struct io_cold_def io_cold_defs[] = {
.async_size = sizeof(struct io_async_msghdr),
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
- .prep_async = io_sendrecv_prep_async,
#endif
},
[IORING_OP_OPENAT2] = {
--
2.30.2