On Tue, Jan 13, 2026 at 3:03 AM Yodel Eldar <yodel.eldar@yodel.dev> wrote:
>
> vhost-user-bridge debug prints UDP TX hexdumps in its transmit handler,
> but does not for receives, even though they are beneficial for testing.
> Add an RX hexdump in the receive callback.
>
> To delineate between transmits and receives, also add a debug print
> indicating that the program is in the transmit handler.
>
> Signed-off-by: Yodel Eldar <yodel.eldar@yodel.dev>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
> contrib/vhost-user-bridge/vhost-user-bridge.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/contrib/vhost-user-bridge/vhost-user-bridge.c b/contrib/vhost-user-bridge/vhost-user-bridge.c
> index ce4c3426d3..3f0fd0fa49 100644
> --- a/contrib/vhost-user-bridge/vhost-user-bridge.c
> +++ b/contrib/vhost-user-bridge/vhost-user-bridge.c
> @@ -179,6 +179,9 @@ vubr_handle_tx(VuDev *dev, int qidx)
>
> assert(qidx % 2);
>
> + DPRINT("\n\n *** IN UDP TRANSMIT HANDLER ***\n\n");
> + DPRINT(" hdrlen = %d\n", hdrlen);
> +
> for (;;) {
> ssize_t ret;
> unsigned int out_num;
> @@ -333,6 +336,10 @@ vubr_backend_recv_cb(int sock, void *ctx)
> };
> ret = RETRY_ON_EINTR(recvmsg(vubr->backend_udp_sock, &msg, 0));
>
> + if (ret > 0 && VHOST_USER_BRIDGE_DEBUG) {
> + iov_hexdump(sg, num, stderr, "RX:", ret);
> + }
> +
> if (i == 0) {
> iov_restore_front(elem->in_sg, sg, hdrlen);
> }
> --
> 2.52.0
>
>
--
Marc-André Lureau