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[PATCH v2 1/2] vdpa: Add dummy receive callback

From: Eugenio Pérez
Subject: [PATCH v2 1/2] vdpa: Add dummy receive callback
Date: Thu, 25 Nov 2021 11:16:13 +0100

Qemu falls back on userland handlers even if vhost-user and vhost-vdpa
cases. These assumes a tap device can handle the packets.

If a vdpa device fail to start, it can trigger a sigsegv because of
that. Add dummy receiver that returns no progress so it can keep

Fixes: 1e0a84ea49 ("vhost-vdpa: introduce vhost-vdpa net client")
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
 net/vhost-vdpa.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 2e3c22a8c7..25dd6dd975 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -170,9 +170,17 @@ static bool vhost_vdpa_check_peer_type(NetClientState *nc, 
ObjectClass *oc,
     return true;
+/** Dummy receive in case qemu falls back to userland tap networking */
+static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf,
+                                  size_t size)
+    return 0;
 static NetClientInfo net_vhost_vdpa_info = {
         .size = sizeof(VhostVDPAState),
+        .receive = vhost_vdpa_receive,
         .cleanup = vhost_vdpa_cleanup,
         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
         .has_ufo = vhost_vdpa_has_ufo,

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