io_uring/net: avoid import_ubuf for regvec send

With registered buffers we set up iterators in helpers like
io_import_fixed(), and there is no need for a import_ubuf() before that.
It was fine as we used real pointers for offset calculation, but that's
not the case anymore since introduction of ublk kernel buffers.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9b2de1a50844f848f62c8de609b494971033a6b9.1743437358.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/net.c b/io_uring/net.c
index eaa627eddb4a44c6ed2dcd149f8f492078e8ca47..24040bc3916a1bebf33f7da891bfe85d5abfa0e7 100644 (file)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -359,6 +359,8 @@ static int io_send_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe)
                kmsg->msg.msg_name = &kmsg->addr;
                kmsg->msg.msg_namelen = addr_len;
        }
+       if (sr->flags & IORING_RECVSEND_FIXED_BUF)
+               return 0;
        if (!io_do_buffer_select(req)) {
                ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
                                  &kmsg->msg.msg_iter);