net: vlan: add support for tunnel offload

GSO tunneled packets are always segmented in software before they are
transmitted by a VLAN, even when the lower device can offload tunnel
encapsulation and VLAN together (i.e., some bits in NETIF_F_GSO_ENCAP_ALL
mask are set in the lower device 'vlan_features'). If we let VLANs have
the same tunnel offload capabilities as their lower device, throughput
can improve significantly when CPU is limited on the transmitter side.

 - set NETIF_F_GSO_ENCAP_ALL bits in the VLAN 'hw_features', to ensure
 that 'features' will have those bits zeroed only when the lower device
 has no hardware support for tunnel encapsulation.
 - for the same reason, copy GSO-related bits of 'hw_enc_features' from
 lower device to VLAN, and ensure to update that value when the lower
 device changes its features.
 - set NETIF_F_HW_CSUM bit in the VLAN 'hw_enc_features' if 'real_dev'
 is able to compute checksums at least for a kind of packets, like done
 with commit 8403debeead8 ("vlan: Keep NETIF_F_HW_CSUM similar to other
 software devices"). This avoids software segmentation due to mismatching
 checksum capabilities between VLAN's 'features' and 'hw_enc_features'.

Reported-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 5e99504..1b7a375 100644 (file)
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -330,6 +330,7 @@ static void vlan_transfer_features(struct net_device *dev,
 
        vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
        vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
+       vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 
        netdev_update_features(vlandev);
 }

diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 44df1c3..c46daf0 100644 (file)
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -92,6 +92,18 @@ static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
        return NULL;
 }
 
+static inline netdev_features_t vlan_tnl_features(struct net_device *real_dev)
+{
+       netdev_features_t ret;
+
+       ret = real_dev->hw_enc_features &
+             (NETIF_F_CSUM_MASK | NETIF_F_ALL_TSO | NETIF_F_GSO_ENCAP_ALL);
+
+       if ((ret & NETIF_F_GSO_ENCAP_ALL) && (ret & NETIF_F_CSUM_MASK))
+               return (ret & ~NETIF_F_CSUM_MASK) | NETIF_F_HW_CSUM;
+       return 0;
+}
+
 #define vlan_group_for_each_dev(grp, i, dev) \
        for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \
                if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index ff720f1..b2d9c8f 100644 (file)
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -562,6 +562,7 @@ static int vlan_dev_init(struct net_device *dev)
 
        dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
                           NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
+                          NETIF_F_GSO_ENCAP_ALL |
                           NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
                           NETIF_F_ALL_FCOE;
 
@@ -572,6 +573,7 @@ static int vlan_dev_init(struct net_device *dev)
                netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 
        dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
+       dev->hw_enc_features = vlan_tnl_features(real_dev);
 
        /* ipv6 shared card related stuff */
        dev->dev_id = real_dev->dev_id;