diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index db36744c6691..7bbb55f303b1 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c @@ -2172,6 +2172,64 @@ static int i40evf_change_mtu(struct net_device *netdev, int new_mtu) return 0; } +/** + * i40evf_features_check - Validate encapsulated packet conforms to limits + * @skb: skb buff + * @netdev: This physical port's netdev + * @features: Offload features that the stack believes apply + **/ +static netdev_features_t i40evf_features_check(struct sk_buff *skb, + struct net_device *dev, + netdev_features_t features) +{ + size_t len; + + /* No point in doing any of this if neither checksum nor GSO are + * being requested for this frame. We can rule out both by just + * checking for CHECKSUM_PARTIAL + */ + if (skb->ip_summed != CHECKSUM_PARTIAL) + return features; + + /* We cannot support GSO if the MSS is going to be less than + * 64 bytes. If it is then we need to drop support for GSO. + */ + if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_size < 64)) + features &= ~NETIF_F_GSO_MASK; + + /* MACLEN can support at most 63 words */ + len = skb_network_header(skb) - skb->data; + if (len & ~(63 * 2)) + goto out_err; + + /* IPLEN and EIPLEN can support at most 127 dwords */ + len = skb_transport_header(skb) - skb_network_header(skb); + if (len & ~(127 * 4)) + goto out_err; + + if (skb->encapsulation) { + /* L4TUNLEN can support 127 words */ + len = skb_inner_network_header(skb) - skb_transport_header(skb); + if (len & ~(127 * 2)) + goto out_err; + + /* IPLEN can support at most 127 dwords */ + len = skb_inner_transport_header(skb) - + skb_inner_network_header(skb); + if (len & ~(127 * 4)) + goto out_err; + } + + /* No need to validate L4LEN as TCP is the only protocol with a + * a flexible value and we support all possible values supported + * by TCP, which is at most 15 dwords + */ + + return features; +out_err: + return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); +} + #define I40EVF_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_TX |\ NETIF_F_HW_VLAN_CTAG_RX |\ NETIF_F_HW_VLAN_CTAG_FILTER) @@ -2206,6 +2264,7 @@ static const struct net_device_ops i40evf_netdev_ops = { .ndo_tx_timeout = i40evf_tx_timeout, .ndo_vlan_rx_add_vid = i40evf_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = i40evf_vlan_rx_kill_vid, + .ndo_features_check = i40evf_features_check, .ndo_fix_features = i40evf_fix_features, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = i40evf_netpoll,