diff options
Diffstat (limited to 'drivers/net/veth.c')
| -rw-r--r-- | drivers/net/veth.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/net/veth.c b/drivers/net/veth.c index c95c67aa52d2..15b2e3923c47 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -294,6 +294,25 @@ static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, netif_rx(skb); } +/* return true if the specified skb has chances of GRO aggregation + * Don't strive for accuracy, but try to avoid GRO overhead in the most + * common scenarios. + * When XDP is enabled, all traffic is considered eligible, as the xmit + * device has TSO off. + * When TSO is enabled on the xmit device, we are likely interested only + * in UDP aggregation, explicitly check for that if the skb is suspected + * - the sock_wfree destructor is used by UDP, ICMP and XDP sockets - + * to belong to locally generated UDP traffic. + */ +static bool veth_skb_is_eligible_for_gro(const struct net_device *dev, + const struct net_device *rcv, + const struct sk_buff *skb) +{ + return !(dev->features & NETIF_F_ALL_TSO) || + (skb->destructor == sock_wfree && + rcv->features & (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD)); +} + static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) { struct veth_priv *rcv_priv, *priv = netdev_priv(dev); @@ -317,8 +336,10 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) /* The napi pointer is available when an XDP program is * attached or when GRO is enabled + * Don't bother with napi/GRO if the skb can't be aggregated */ - use_napi = rcu_access_pointer(rq->napi); + use_napi = rcu_access_pointer(rq->napi) && + veth_skb_is_eligible_for_gro(dev, rcv, skb); skb_record_rx_queue(skb, rxq); } |