netdev - [patch net-next v2 00/10] net: sched: allow qdiscs to share filter block instances

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Message-Id: <20171112155604.24061-1-jiri@resnulli.us>
Date:   Sun, 12 Nov 2017 16:55:54 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
        mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        jakub.kicinski@...ronome.com, ast@...nel.org, daniel@...earbox.net,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com
Subject: [patch net-next v2 00/10] net: sched: allow qdiscs to share filter block instances

From: Jiri Pirko <jiri@...lanox.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

---
v1->v2:
-patch 4:
 - fix binder_type to check "egress" as well as pointed out by Daniel
-patch 1:
 - new patch due to rebase (another tp->q usage appeared)
-patch 7-10:
 - new patches to offload shared blocks in mlxsw

*** BLURB HERE ***

Jiri Pirko (10):
  cls_bpf: move prog offload->netdev check into drivers
  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
  mlxsw: spectrum_acl: Reshuffle code around
    mlxsw_sp_acl_ruleset_create/destroy
  mlxsw: spectrum_acl: Don't store netdev and ingress for ruleset unbind
  mlxsw: spectrum_acl: Implement TC block sharing
  mlxsw: spectrum_acl: Pass mlxsw_sp_port down to ruleset bind/unbind
    ops

 drivers/net/ethernet/mellanox/mlxsw/spectrum.c     | 146 +++++++--
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |  38 ++-
 drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c | 283 +++++++++++++-----
 .../ethernet/mellanox/mlxsw/spectrum_acl_tcam.c    |  44 ++-
 .../net/ethernet/mellanox/mlxsw/spectrum_flower.c  |  41 ++-
 drivers/net/ethernet/netronome/nfp/bpf/main.c      |   2 +
 include/linux/bpf.h                                |  16 +
 include/net/pkt_cls.h                              |   4 +
 include/net/sch_generic.h                          |   9 +-
 include/uapi/linux/pkt_sched.h                     |  11 +
 kernel/bpf/syscall.c                               |  39 ++-
 net/sched/cls_api.c                                | 328 ++++++++++++++++++---
 net/sched/cls_bpf.c                                |  10 +-
 net/sched/cls_flow.c                               |   2 +-
 net/sched/cls_route.c                              |   2 +-
 net/sched/sch_ingress.c                            |  89 +++++-
 16 files changed, 851 insertions(+), 213 deletions(-)

-- 
2.9.5