From e8f5634484e8c9c77d389a25b6f38d4abeb435b5 Mon Sep 17 00:00:00 2001 From: Ilya Maximets Date: Wed, 6 Nov 2019 21:38:33 +0000 Subject: netdev-afxdp: Best-effort configuration of XDP mode. Until now there was only two options for XDP mode in OVS: SKB or DRV. i.e. 'generic XDP' or 'native XDP with zero-copy enabled'. Devices like 'veth' interfaces in Linux supports native XDP, but doesn't support zero-copy mode. This case can not be covered by existing API and we have to use slower generic XDP for such devices. There are few more issues, e.g. TCP is not supported in generic XDP mode for veth interfaces due to kernel limitations, however it is supported in native mode. This change introduces ability to use native XDP without zero-copy along with best-effort configuration option that enabled by default. In best-effort case OVS will sequentially try different modes starting from the fastest one and will choose the first acceptable for current interface. This will guarantee the best possible performance. If user will want to choose specific mode, it's still possible by setting the 'options:xdp-mode'. This change additionally changes the API by renaming the configuration knob from 'xdpmode' to 'xdp-mode' and also renaming the modes themselves to be more user-friendly. The full list of currently supported modes: * native-with-zerocopy - former DRV * native - new one, DRV without zero-copy * generic - former SKB * best-effort - new one, chooses the best available from 3 above modes Since 'best-effort' is a default mode, users will not need to explicitely set 'xdp-mode' in most cases. TCP related tests enabled back in system afxdp testsuite, because 'best-effort' will choose 'native' mode for veth interfaces and this mode has no issues with TCP. Signed-off-by: Ilya Maximets Acked-by: William Tu Acked-by: Eelco Chaudron --- tests/system-afxdp-macros.at | 7 ------- 1 file changed, 7 deletions(-) (limited to 'tests/system-afxdp-macros.at') diff --git a/tests/system-afxdp-macros.at b/tests/system-afxdp-macros.at index f0683c0a9..5ee2ceb1a 100644 --- a/tests/system-afxdp-macros.at +++ b/tests/system-afxdp-macros.at @@ -30,10 +30,3 @@ m4_define([CONFIGURE_VETH_OFFLOADS], AT_CHECK([ethtool -K $1 txvlan off], [0], [ignore], [ignore]) ] ) - -# OVS_START_L7([namespace], [protocol]) -# -# AF_XDP doesn't work with TCP over virtual interfaces for now. -# -m4_define([OVS_START_L7], - [AT_SKIP_IF([:])]) -- cgit v1.2.1