[PATCH 4/8] io_uring/net: add provided buffer support for IORING_OP_SENDMSG

[Jens Axboe <axboe@kernel.dk>]

Adds provided buffer support for sendmsg as well, see the previous commit
that added it to IORING_OP_SEND for a longer explanation of why this
makes sense.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/net.c   | 15 ++++++++++++++-
 io_uring/opdef.c |  1 +
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 10b6d8caf4da..30afb394efd7 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -436,6 +436,7 @@ int io_sendmsg(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 int cflags;
 	unsigned flags;
 	int min_ret = 0;
 	int ret;
@@ -458,6 +459,17 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 	    (sr->flags & IORING_RECVSEND_POLL_FIRST))
 		return io_setup_async_msg(req, kmsg, issue_flags);
 
+	if (io_do_buffer_select(req)) {
+		void __user *buf;
+		size_t len = sr->len;
+
+		buf = io_buffer_select(req, &len, issue_flags);
+		if (!buf)
+			return -ENOBUFS;
+
+		iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_SOURCE, buf, len);
+	}
+
 	flags = sr->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		flags |= MSG_DONTWAIT;
@@ -576,7 +588,8 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags)
 		ret += sr->done_io;
 	else if (sr->done_io)
 		ret = sr->done_io;
-	io_req_set_res(req, ret, 0);
+	cflags = io_put_kbuf(req, issue_flags);
+	io_req_set_res(req, ret, cflags);
 	return IOU_OK;
 }
 
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 88fbe5cfd379..1f6b09e61ef8 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -139,6 +139,7 @@ const struct io_issue_def io_issue_defs[] = {
 		.pollout		= 1,
 		.ioprio			= 1,
 		.manual_alloc		= 1,
+		.buffer_select		= 1,
 #if defined(CONFIG_NET)
 		.prep			= io_sendmsg_prep,
 		.issue			= io_sendmsg,
-- 
2.43.0