[PATCH v7 net-next 08/12] flow_offload: add process to update action stats from hardware
From: Simon Horman <hidden>
Date: 2021-12-17 14:22:50
Also in:
linux-rdma, lkml
Subsystem:
networking [general], tc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
From: Baowen Zheng <redacted> When collecting stats for actions update them using both hardware and software counters. Stats update process should not run in context of preempt_disable. Signed-off-by: Baowen Zheng <redacted> Signed-off-by: Louis Peens <redacted> Signed-off-by: Simon Horman <redacted> --- include/net/act_api.h | 1 + include/net/pkt_cls.h | 18 ++++++++++-------- net/sched/act_api.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 45 insertions(+), 8 deletions(-)
diff --git a/include/net/act_api.h b/include/net/act_api.h
index 15c6a881817d..20104dfdd57c 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h@@ -253,6 +253,7 @@ void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, u64 drops, bool hw); int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); +int tcf_action_update_hw_stats(struct tc_action *action); int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, struct tcf_chain **handle, struct netlink_ext_ack *newchain);
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 1bfb616ea759..9021e29694c9 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h@@ -273,18 +273,20 @@ tcf_exts_stats_update(const struct tcf_exts *exts, #ifdef CONFIG_NET_CLS_ACT int i; - preempt_disable(); - for (i = 0; i < exts->nr_actions; i++) { struct tc_action *a = exts->actions[i]; - tcf_action_stats_update(a, bytes, packets, drops, - lastuse, true); - a->used_hw_stats = used_hw_stats; - a->used_hw_stats_valid = used_hw_stats_valid; - } + /* if stats from hw, just skip */ + if (tcf_action_update_hw_stats(a)) { + preempt_disable(); + tcf_action_stats_update(a, bytes, packets, drops, + lastuse, true); + preempt_enable(); - preempt_enable(); + a->used_hw_stats = used_hw_stats; + a->used_hw_stats_valid = used_hw_stats_valid; + } + } #endif }
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 073461d9eacf..ac6c2c396d4f 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c@@ -246,6 +246,37 @@ static int tcf_action_offload_add(struct tc_action *action, return err; } +int tcf_action_update_hw_stats(struct tc_action *action) +{ + struct flow_offload_action fl_act = {}; + int err; + + if (!tc_act_in_hw(action)) + return -EOPNOTSUPP; + + err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL); + if (err) + return err; + + err = tcf_action_offload_cmd(&fl_act, NULL, NULL); + if (!err) { + preempt_disable(); + tcf_action_stats_update(action, fl_act.stats.bytes, + fl_act.stats.pkts, + fl_act.stats.drops, + fl_act.stats.lastused, + true); + preempt_enable(); + action->used_hw_stats = fl_act.stats.used_hw_stats; + action->used_hw_stats_valid = true; + } else { + return -EOPNOTSUPP; + } + + return 0; +} +EXPORT_SYMBOL(tcf_action_update_hw_stats); + static int tcf_action_offload_del(struct tc_action *action) { struct flow_offload_action fl_act = {};
@@ -1318,6 +1349,9 @@ int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, if (p == NULL) goto errout; + /* update hw stats for this action */ + tcf_action_update_hw_stats(p); + /* compat_mode being true specifies a call that is supposed * to add additional backward compatibility statistic TLVs. */
--
2.20.1