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net: sched: RED: Introduce an ECN nodrop mode

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When the RED Qdisc is currently configured to enable ECN, the RED algorithm
is used to decide whether a certain SKB should be marked. If that SKB is
not ECN-capable, it is early-dropped.

It is also possible to keep all traffic in the queue, and just mark the
ECN-capable subset of it, as appropriate under the RED algorithm. Some
switches support this mode, and some installations make use of it.

To that end, add a new RED flag, TC_RED_NODROP. When the Qdisc is
configured with this flag, non-ECT traffic is enqueued instead of being
early-dropped.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata
2020-03-13 01:10:57 +02:00
committed by David S. Miller
parent 14bc175d9c
commit 0a7fad2376
4 changed files with 32 additions and 6 deletions
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5
include/net/red.h
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@@ -209,6 +209,11 @@ static inline int red_get_flags(unsigned char qopt_flags,
static inline int red_validate_flags(unsigned char flags,
struct netlink_ext_ack *extack)
{
if ((flags & TC_RED_NODROP) && !(flags & TC_RED_ECN)) {
NL_SET_ERR_MSG_MOD(extack, "nodrop mode is only meaningful with ECN");
return -EINVAL;
}
return 0;
}