Merge tag 'mmc-v3.19-1' of git://git.linaro.org/people/ulf.hansson/mmc

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

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d75256bd1a6ab8bb6284ad4088e9513469fffe8a..b0bc8ead47de240c8f27605488eb300d0445c4fb 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -491,8 +491,17 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
                        break;
                case VIRTIO_NET_HDR_GSO_UDP:
+               {
+                       static bool warned;
+
+                       if (!warned) {
+                               warned = true;
+                               netdev_warn(dev,
+                                           "host using disabled UFO feature; please fix it\n");
+                       }
                        skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
                        break;
+               }
                case VIRTIO_NET_HDR_GSO_TCPV6:
                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
                        break;
@@ -881,8 +890,6 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
                        hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
                else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
                        hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
-               else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
-                       hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
                else
                        BUG();
                if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
@@ -1666,6 +1673,40 @@ static const struct attribute_group virtio_net_mrg_rx_group = {
 };
 #endif
 
+static bool virtnet_fail_on_feature(struct virtio_device *vdev,
+                                   unsigned int fbit,
+                                   const char *fname, const char *dname)
+{
+       if (!virtio_has_feature(vdev, fbit))
+               return false;
+
+       dev_err(&vdev->dev, "device advertises feature %s but not %s",
+               fname, dname);
+
+       return true;
+}
+
+#define VIRTNET_FAIL_ON(vdev, fbit, dbit)                      \
+       virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
+
+static bool virtnet_validate_features(struct virtio_device *vdev)
+{
+       if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
+           (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
+                            "VIRTIO_NET_F_CTRL_VQ") ||
+            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
+                            "VIRTIO_NET_F_CTRL_VQ") ||
+            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
+                            "VIRTIO_NET_F_CTRL_VQ") ||
+            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
+            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
+                            "VIRTIO_NET_F_CTRL_VQ"))) {
+               return false;
+       }
+
+       return true;
+}
+
 static int virtnet_probe(struct virtio_device *vdev)
 {
        int i, err;
@@ -1673,6 +1714,9 @@ static int virtnet_probe(struct virtio_device *vdev)
        struct virtnet_info *vi;
        u16 max_queue_pairs;
 
+       if (!virtnet_validate_features(vdev))
+               return -EINVAL;
+
        /* Find if host supports multiqueue virtio_net device */
        err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
                                   struct virtio_net_config,
@@ -1705,7 +1749,7 @@ static int virtnet_probe(struct virtio_device *vdev)
                        dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
 
                if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
-                       dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
+                       dev->hw_features |= NETIF_F_TSO
                                | NETIF_F_TSO_ECN | NETIF_F_TSO6;
                }
                /* Individual feature bits: what can host handle? */
@@ -1715,11 +1759,9 @@ static int virtnet_probe(struct virtio_device *vdev)
                        dev->hw_features |= NETIF_F_TSO6;
                if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
                        dev->hw_features |= NETIF_F_TSO_ECN;
-               if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
-                       dev->hw_features |= NETIF_F_UFO;
 
                if (gso)
-                       dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
+                       dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
                /* (!csum && gso) case will be fixed by register_netdev() */
        }
        if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
@@ -1757,8 +1799,7 @@ static int virtnet_probe(struct virtio_device *vdev)
        /* If we can receive ANY GSO packets, we must allocate large ones. */
        if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
            virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
-           virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
-           virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
+           virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
                vi->big_packets = true;
 
        if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
@@ -1952,9 +1993,9 @@ static struct virtio_device_id id_table[] = {
 static unsigned int features[] = {
        VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
        VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
-       VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
+       VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6,
        VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
-       VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
+       VIRTIO_NET_F_GUEST_ECN,
        VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
        VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
        VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,