Commit e69985c6 authored by Amir Vadai's avatar Amir Vadai Committed by David S. Miller
Browse files

net/sched: cls_flower: Introduce support in SKIP SW flag 



In order to make a filter processed only by hardware, skip_sw flag
should be supplied. This is an addition to the already existing skip_hw
flag (filter will be processed by software only). If no flag is
specified, filter will be processed by both software and hardware.

If only hardware offloaded filters exist, fl_classify() will return
without doing anything.

A following userspace patch will be sent once kernel patch is accepted.

Example:

tc filter add dev enp0s9 protocol ip prio 20 parent ffff: \
	flower \
		ip_proto 6 \
		indev enp0s9 \
		skip_sw \
	action skbedit mark 0x1234

Signed-off-by: default avatarAmir Vadai <amirva@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Acked-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 919f274f

net/sched/cls_flower.c

+22 −9
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ struct cls_fl_filter { 
	struct fl_flow_key key;

	struct list_head list;

	u32 handle;

	u32 flags;

	struct rcu_head	rcu;

};
@@ -123,6 +124,9 @@ static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, 
	struct fl_flow_key skb_key;

	struct fl_flow_key skb_mkey;



	if (!atomic_read(&head->ht.nelems))

		return -1;



	fl_clear_masked_range(&skb_key, &head->mask);

	skb_key.indev_ifindex = skb->skb_iif;

	/* skb_flow_dissect() does not set n_proto in case an unknown protocol,
@@ -136,7 +140,7 @@ static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, 
	f = rhashtable_lookup_fast(&head->ht,

				   fl_key_get_start(&skb_mkey, &head->mask),

				   head->ht_params);

	if (f) {

	if (f && !(f->flags & TCA_CLS_FLAGS_SKIP_SW)) {

		*res = f->res;

		return tcf_exts_exec(skb, &f->exts, res);

	}
@@ -524,7 +528,6 @@ static int fl_change(struct net *net, struct sk_buff *in_skb, 
	struct cls_fl_filter *fnew;

	struct nlattr *tb[TCA_FLOWER_MAX + 1];

	struct fl_flow_mask mask = {};

	u32 flags = 0;

	int err;



	if (!tca[TCA_OPTIONS])
@@ -552,8 +555,14 @@ static int fl_change(struct net *net, struct sk_buff *in_skb, 
	}

	fnew->handle = handle;



	if (tb[TCA_FLOWER_FLAGS])

		flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);

	if (tb[TCA_FLOWER_FLAGS]) {

		fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);



		if (!tc_flags_valid(fnew->flags)) {

			err = -EINVAL;

			goto errout;

		}

	}



	err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);

	if (err)
@@ -563,10 +572,12 @@ static int fl_change(struct net *net, struct sk_buff *in_skb, 
	if (err)

		goto errout;



	if (!(fnew->flags & TCA_CLS_FLAGS_SKIP_SW)) {

		err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,

					     head->ht_params);

		if (err)

			goto errout;

	}



	fl_hw_replace_filter(tp,

			     &head->dissector,
@@ -574,7 +585,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb, 
			     &fnew->key,

			     &fnew->exts,

			     (unsigned long)fnew,

			     flags);

			     fnew->flags);



	if (fold) {

		rhashtable_remove_fast(&head->ht, &fold->ht_node,
@@ -734,6 +745,8 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, 
				  sizeof(key->tp.dst))))

		goto nla_put_failure;



	nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags);



	if (tcf_exts_dump(skb, &f->exts))

		goto nla_put_failure;

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