[PATCH net-next 3/8] net/sched: cls_flower: Hardware offloaded filters statistics support

[Amir Vadai]

From: Amir Vadai <ami...@mellanox.com>

Introduce a new command in ndo_setup_tc() for hardware offloaded
filters, to call the NIC driver, and make it update the statistics.
This will be done before dumping the filter and its statistics.

Signed-off-by: Amir Vadai <ami...@mellanox.com>
---
 include/net/pkt_cls.h  |  1 +
 net/sched/cls_flower.c | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index caa5e18..cc561a8 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -412,6 +412,7 @@ static inline bool tc_should_offload(struct net_device 
*dev, u32 flags)
 enum tc_fl_command {
        TC_CLSFLOWER_REPLACE,
        TC_CLSFLOWER_DESTROY,
+       TC_CLSFLOWER_STATS,
 };
 
 struct tc_cls_flower_offload {
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 2181ffc..730aaca 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -210,6 +210,25 @@ static void fl_hw_replace_filter(struct tcf_proto *tp,
        dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
 }
 
+static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
+{
+       struct net_device *dev = tp->q->dev_queue->dev;
+       struct tc_cls_flower_offload offload = {0};
+       struct tc_to_netdev tc;
+
+       if (!tc_should_offload(dev, 0))
+               return;
+
+       offload.command = TC_CLSFLOWER_STATS;
+       offload.cookie = (unsigned long)f;
+       offload.exts = &f->exts;
+
+       tc.type = TC_SETUP_CLSFLOWER;
+       tc.cls_flower = &offload;
+
+       dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
+}
+
 static bool fl_destroy(struct tcf_proto *tp, bool force)
 {
        struct cls_fl_head *head = rtnl_dereference(tp->root);
@@ -662,6 +681,8 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, 
unsigned long fh,
                        goto nla_put_failure;
        }
 
+       fl_hw_update_stats(tp, f);
+
        if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
                            mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
                            sizeof(key->eth.dst)) ||
-- 
2.8.0