[RFC net-next 5/9] net/act_gact: Introduce hardware offload support for drop

[Amir Vadai]

Enable hardware offloaded packet dropping when filter is marked with
'offload' attribute.

Signed-off-by: Amir Vadai <a...@vadai.me>
---
 net/sched/act_gact.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index 5c1b051..b639b18 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <net/netlink.h>
 #include <net/pkt_sched.h>
+#include <net/switchdev.h>
 #include <linux/tc_act/tc_gact.h>
 #include <net/tc_act/tc_gact.h>
 
@@ -183,6 +184,21 @@ nla_put_failure:
        return -1;
 }
 
+static int tcf_gact_offload_init(struct tc_action *a,
+                                struct switchdev_obj_port_flow_act *obj)
+{
+       struct tcf_gact *gact = a->priv;
+
+       if (gact->tcf_action == TC_ACT_SHOT) {
+               obj->actions |= BIT(SWITCHDEV_OBJ_PORT_FLOW_ACT_DROP);
+
+               return 0;
+       }
+
+       pr_err("Only 'drop' is supported for offloaded gact\n");
+       return -ENOTSUPP;
+}
+
 static struct tc_action_ops act_gact_ops = {
        .kind           =       "gact",
        .type           =       TCA_ACT_GACT,
@@ -190,6 +206,7 @@ static struct tc_action_ops act_gact_ops = {
        .act            =       tcf_gact,
        .dump           =       tcf_gact_dump,
        .init           =       tcf_gact_init,
+       .offload_init   =       tcf_gact_offload_init,
 };
 
 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
-- 
2.7.0