diff options
| author |   Petr Machata <petrm@mellanox.com> | 2020-03-13 01:10:57 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-03-14 21:03:46 -0700 |
| commit | 0a7fad2376ba6b37c6b1a1072ed2a2381d82cd18 (patch) | |
| tree | cecaf961e1015055ee4f9912de73fbd5d04f0722 /include/net/red.h | |
| parent | net: sched: Allow extending set of supported RED flags (diff) | |
| download | wireguard-linux-0a7fad2376ba6b37c6b1a1072ed2a2381d82cd18.tar.xz wireguard-linux-0a7fad2376ba6b37c6b1a1072ed2a2381d82cd18.zip | |
net: sched: RED: Introduce an ECN nodrop mode
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>
Diffstat (limited to 'include/net/red.h')
| -rw-r--r-- | include/net/red.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/red.h b/include/net/red.h index 6a2aaa6c7c41..fc455445f4b2 100644 --- a/include/net/red.h +++ b/include/net/red.h @@ -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; } |