From: Jiri Pirko <j...@mellanox.com>
Currently the filters added to qdiscs are independent. So for example if you
have 2 netdevices and you create ingress qdisc on both and you want to add
identical filter rules both, you need to add them twice. This patchset
makes this easier and mainly saves resources allowing to share all filters
within a qdisc - I call it a "filter block". Also this helps to save
resources when we do offload to hw for example to expensive TCAM.
So back to the example. First, we create 2 qdiscs. Both will share
block number 22. "22" is just an identification. If we don't pass any
block number, a new one will be generated by kernel:
$ tc qdisc add dev ens7 ingress block 22
^^^^^^^^
$ tc qdisc add dev ens8 ingress block 22
^^^^^^^^
Now if we list the qdiscs, we will see the block index in the output:
$ tc qdisc
qdisc ingress ffff: dev ens7 parent ffff:fff1 block 22
qdisc ingress ffff: dev ens8 parent ffff:fff1 block 22
Now we can add filter to any of qdiscs sharing the same block:
$ tc filter add dev ens7 ingress protocol ip pref 25 flower dst_ip
192.168.0.0/16 action drop
We will see the same output if we list filters for ens7 and ens8, including
stats:
$ tc -s filter show dev ens7 ingress
filter protocol ip pref 25 flower chain 0
filter protocol ip pref 25 flower chain 0 handle 0x1
eth_type ipv4
dst_ip 192.168.0.0/16
not_in_hw
action order 1: gact action drop
random type none pass val 0
index 1 ref 1 bind 1 installed 39 sec used 2 sec
Action statistics:
Sent 3108 bytes 37 pkt (dropped 37, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
$ tc -s filter show dev ens8 ingress
filter protocol ip pref 25 flower chain 0
filter protocol ip pref 25 flower chain 0 handle 0x1
eth_type ipv4
dst_ip 192.168.0.0/16
not_in_hw
action order 1: gact action drop
random type none pass val 0
index 1 ref 1 bind 1 installed 40 sec used 3 sec
Action statistics:
Sent 3108 bytes 37 pkt (dropped 37, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Jiri Pirko (5):
net: sched: introduce support for multiple filter chain pointers
registration
net: sched: avoid usage of tp->q in tcf_classify
net: sched: introduce block mechanism to handle netif_keep_dst calls
net: sched: remove classid and q fields from tcf_proto
net: sched: allow ingress and clsact qdiscs to share filter blocks
include/net/pkt_cls.h | 4 +
include/net/sch_generic.h | 9 +-
include/uapi/linux/pkt_sched.h | 11 ++
net/sched/cls_api.c | 327 +++++++++++++++++++++++++++++++++++------
net/sched/cls_bpf.c | 4 +-
net/sched/cls_flow.c | 2 +-
net/sched/cls_route.c | 2 +-
net/sched/sch_ingress.c | 89 ++++++++++-
8 files changed, 397 insertions(+), 51 deletions(-)
--
2.9.5
