[3/7] virtio-net: Do not check for the queue before RSS

Commit Message

Akihiko Odaki Sept. 15, 2024, 1:06 a.m. UTC

virtio_net_can_receive() checks if the queue is ready, but RSS will
change the queue to use so, strictly speaking, we may still be able to
receive the packet even if the queue initially provided is not ready.
Perform RSS before virtio_net_can_receive() to cover such a case.

Fixes: 4474e37a5b3a ("virtio-net: implement RX RSS processing")
Signed-off-by: Akihiko Odaki <[e-mail]>
---
 hw/net/virtio-net.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Patch

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 755530c035e4..3ee1ebd88daa 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1901,10 +1901,6 @@  static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
     size_t offset, i, guest_offset, j;
     ssize_t err;
 
-    if (!virtio_net_can_receive(nc)) {
-        return -1;
-    }
-
     if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
         int index = virtio_net_process_rss(nc, buf, size, &extra_hdr);
         if (index >= 0) {
@@ -1913,6 +1909,10 @@  static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
         }
     }
 
+    if (!virtio_net_can_receive(nc)) {
+        return -1;
+    }
+
     /* hdr_len refers to the header we supply to the guest */
     if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
         return 0;