diff options
| author | Petr Machata <petrm@mellanox.com> | 2020-03-13 02:10:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-15 07:03:46 +0300 |
| commit | 0a7fad2376ba6b37c6b1a1072ed2a2381d82cd18 (patch) | |
| tree | cecaf961e1015055ee4f9912de73fbd5d04f0722 /include | |
| parent | 14bc175d9c885c86239de3d730eea85ad67bfe7b (diff) | |
| download | linux-0a7fad2376ba6b37c6b1a1072ed2a2381d82cd18.tar.xz | |
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')
| -rw-r--r-- | include/net/pkt_cls.h | 1 | ||||
| -rw-r--r-- | include/net/red.h | 5 | ||||
| -rw-r--r-- | include/uapi/linux/pkt_sched.h | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h index dbc89452f90b..1db8b27d4515 100644 --- a/include/net/pkt_cls.h +++ b/include/net/pkt_cls.h @@ -740,6 +740,7 @@ struct tc_red_qopt_offload_params { u32 limit; bool is_ecn; bool is_harddrop; + bool is_nodrop; struct gnet_stats_queue *qstats; }; 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; } diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h index 6325507935ea..ea39287d59c8 100644 --- a/include/uapi/linux/pkt_sched.h +++ b/include/uapi/linux/pkt_sched.h @@ -286,6 +286,7 @@ struct tc_red_qopt { #define TC_RED_ECN 1 #define TC_RED_HARDDROP 2 #define TC_RED_ADAPTATIVE 4 +#define TC_RED_NODROP 8 }; #define TC_RED_HISTORIC_FLAGS (TC_RED_ECN | TC_RED_HARDDROP | TC_RED_ADAPTATIVE) |