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authorJakub Kicinski <jakub.kicinski@netronome.com>2018-11-14 22:23:51 -0800
committerDavid S. Miller <davem@davemloft.net>2018-11-16 23:08:51 -0800
commit72111015024f4eddb5aac400ddbe38a4f8f0279a (patch)
treee95916e2047828c6759fead39210a5f1b83c2d21 /.gitattributes
parent25fc1989077e71be9fdbe6b78670cf90df2fb789 (diff)
downloadlinux-72111015024f4eddb5aac400ddbe38a4f8f0279a.tar.bz2
net: sched: gred: allow manipulating per-DP RED flags
Allow users to set and dump RED flags (ECN enabled and harddrop) on per-virtual queue basis. Validation of attributes is split from changes to make sure we won't have to undo previous operations when we find out configuration is invalid. The objective is to allow changing per-Qdisc parameters without overwriting the per-vq configured flags. Old user space will not pass the TCA_GRED_VQ_FLAGS attribute and per-Qdisc flags will always get propagated to the virtual queues. New user space which wants to make use of per-vq flags should set per-Qdisc flags to 0 and then configure per-vq flags as it sees fit. Once per-vq flags are set per-Qdisc flags can't be changed to non-zero. Vice versa - if the per-Qdisc flags are non-zero the TCA_GRED_VQ_FLAGS attribute has to either be omitted or set to the same value as per-Qdisc flags. Update per-Qdisc parameters: per-Qdisc | per-VQ | result 0 | 0 | all vq flags updated 0 | non-0 | error (vq flags in use) non-0 | 0 | -- impossible -- non-0 | non-0 | all vq flags updated Update per-VQ state (flags parameter not specified): no change to flags Update per-VQ state (flags parameter set): per-Qdisc | per-VQ | result 0 | any | per-vq flags updated non-0 | 0 | -- impossible -- non-0 | non-0 | error (per-Qdisc flags in use) Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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