[PATCH net-next 08/13] net/sched: extend matchall offload for hardware statistics

[Jakub Kicinski]

From: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>

Introduce a new command for matchall classifiers that allows hardware
to update statistics.

Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuu...@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 include/net/pkt_cls.h    |  2 ++
 net/sched/cls_matchall.c | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 2d0470661277..161fcf8516ac 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -760,12 +760,14 @@ tc_cls_flower_offload_flow_rule(struct 
tc_cls_flower_offload *tc_flow_cmd)
 enum tc_matchall_command {
        TC_CLSMATCHALL_REPLACE,
        TC_CLSMATCHALL_DESTROY,
+       TC_CLSMATCHALL_STATS,
 };
 
 struct tc_cls_matchall_offload {
        struct tc_cls_common_offload common;
        enum tc_matchall_command command;
        struct flow_rule *rule;
+       struct flow_stats stats;
        unsigned long cookie;
 };
 
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 87bff17ac782..da916f39b719 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -321,6 +321,23 @@ static int mall_reoffload(struct tcf_proto *tp, bool add, 
tc_setup_cb_t *cb,
        return 0;
 }
 
+static void mall_stats_hw_filter(struct tcf_proto *tp,
+                                struct cls_mall_head *head,
+                                unsigned long cookie)
+{
+       struct tc_cls_matchall_offload cls_mall = {};
+       struct tcf_block *block = tp->chain->block;
+
+       tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL);
+       cls_mall.command = TC_CLSMATCHALL_STATS;
+       cls_mall.cookie = cookie;
+
+       tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false);
+
+       tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes,
+                             cls_mall.stats.pkts, cls_mall.stats.lastused);
+}
+
 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
                     struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
 {
@@ -332,6 +349,9 @@ static int mall_dump(struct net *net, struct tcf_proto *tp, 
void *fh,
        if (!head)
                return skb->len;
 
+       if (!tc_skip_hw(head->flags))
+               mall_stats_hw_filter(tp, head, (unsigned long)head);
+
        t->tcm_handle = head->handle;
 
        nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
-- 
2.21.0