virtio_net: lower limit on buffer size

[karo-tx-linux.git] / drivers / net / virtio_net.c

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 9320d96a1632bbebe8bd1d4a04059e0df631ac19..a871f45ecc79a438b2b43465d3719f240ff25cb5 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -869,7 +869,7 @@ static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
        unsigned int len;
 
        len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
-                               rq->min_buf_len - hdr_len, PAGE_SIZE - hdr_len);
+                               rq->min_buf_len, PAGE_SIZE - hdr_len);
        return ALIGN(len, L1_CACHE_BYTES);
 }
 
@@ -1989,6 +1989,7 @@ static const struct net_device_ops virtnet_netdev = {
        .ndo_poll_controller = virtnet_netpoll,
 #endif
        .ndo_xdp                = virtnet_xdp,
+       .ndo_features_check     = passthru_features_check,
 };
 
 static void virtnet_config_changed_work(struct work_struct *work)
@@ -2143,7 +2144,8 @@ static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqu
        unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
        unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
 
-       return max(min_buf_len, hdr_len);
+       return max(max(min_buf_len, hdr_len) - hdr_len,
+                  (unsigned int)GOOD_PACKET_LEN);
 }
 
 static int virtnet_find_vqs(struct virtnet_info *vi)