diff options
| author |   Davide Caratti <dcaratti@redhat.com> | 2018-11-07 11:28:18 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-11-07 22:23:30 -0800 |
| commit | 7dad9937e064a6411cc3427f3f5870fa72132ad8 (patch) | |
| tree | 9c5ea522104dbbaaf9bec8c0005beddd0bf99167 /net/8021q/vlan.h | |
| parent | tun: compute the RFS hash only if needed. (diff) | |
| download | linux-dev-7dad9937e064a6411cc3427f3f5870fa72132ad8.tar.xz linux-dev-7dad9937e064a6411cc3427f3f5870fa72132ad8.zip | |
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>
Diffstat (limited to 'net/8021q/vlan.h')
| -rw-r--r-- | net/8021q/vlan.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h index 44df1c3df02d..c46daf09a501 100644 --- 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, \ |