Commit 566a4242 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring/net: use ITER_UBUF for single segment send maps 



Just like what is being done on the recv side, if we only map a single
segment, then use ITER_UBUF for mapping it. That's more efficient than
using an ITER_IOVEC.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 03e02e8f

io_uring/net.c

+12 −3
Original line number Diff line number Diff line
@@ -618,14 +618,23 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags) 
		if (unlikely(ret < 0))

			return ret;



		sr->len = arg.out_len;

		iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE, arg.iovs, ret,

				arg.out_len);

		if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {

			kmsg->free_iov_nr = ret;

			kmsg->free_iov = arg.iovs;

			req->flags |= REQ_F_NEED_CLEANUP;

		}

		sr->len = arg.out_len;



		if (ret == 1) {

			sr->buf = arg.iovs[0].iov_base;

			ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,

						&kmsg->msg.msg_iter);

			if (unlikely(ret))

				return ret;

		} else {

			iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE,

					arg.iovs, ret, arg.out_len);

		}

	}



	/*