linux/net/8021q
Davide Caratti 7dad9937e0 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 8403debeea ("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>
2018-11-07 22:23:30 -08:00
..
Kconfig 8021q: update description 2014-01-21 17:01:25 -08:00
Makefile net: remove blank lines at end of file 2018-07-24 14:10:43 -07:00
vlan.c net: vlan: add support for tunnel offload 2018-11-07 22:23:30 -08:00
vlan.h net: vlan: add support for tunnel offload 2018-11-07 22:23:30 -08:00
vlan_core.c vlan: vlan_hw_filter_capable() can be static 2018-03-31 23:20:48 -04:00
vlan_dev.c net: vlan: add support for tunnel offload 2018-11-07 22:23:30 -08:00
vlan_gvrp.c net: vlan: prepare for 802.1ad support 2013-04-19 14:45:27 -04:00
vlan_mvrp.c net: vlan: prepare for 802.1ad support 2013-04-19 14:45:27 -04:00
vlan_netlink.c vlan: Add extack messages for link create 2018-05-17 17:08:55 -04:00
vlanproc.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
vlanproc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00