Commit eadb4148 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

net: cls_bpf: add support for marking filters as hardware-only 



Add cls_bpf support for the TCA_CLS_FLAGS_SKIP_SW flag.

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0d01d45f

net/sched/cls_bpf.c

+25 −9
Original line number Diff line number Diff line
@@ -28,7 +28,7 @@ MODULE_DESCRIPTION("TC BPF based classifier"); 


#define CLS_BPF_NAME_LEN	256

#define CLS_BPF_SUPPORTED_GEN_FLAGS		\

	TCA_CLS_FLAGS_SKIP_HW

	(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)



struct cls_bpf_head {

	struct list_head plist;
@@ -96,7 +96,9 @@ static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, 


		qdisc_skb_cb(skb)->tc_classid = prog->res.classid;



		if (at_ingress) {

		if (tc_skip_sw(prog->gen_flags)) {

			filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;

		} else if (at_ingress) {

			/* It is safe to push/pull even if skb_shared() */

			__skb_push(skb, skb->mac_len);

			bpf_compute_data_end(skb);
@@ -164,32 +166,42 @@ static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, 
					     tp->protocol, &offload);

}



static void cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,

static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,

			   struct cls_bpf_prog *oldprog)

{

	struct net_device *dev = tp->q->dev_queue->dev;

	struct cls_bpf_prog *obj = prog;

	enum tc_clsbpf_command cmd;

	bool skip_sw;

	int ret;



	skip_sw = tc_skip_sw(prog->gen_flags) ||

		(oldprog && tc_skip_sw(oldprog->gen_flags));



	if (oldprog && oldprog->offloaded) {

		if (tc_should_offload(dev, tp, prog->gen_flags)) {

			cmd = TC_CLSBPF_REPLACE;

		} else {

		} else if (!tc_skip_sw(prog->gen_flags)) {

			obj = oldprog;

			cmd = TC_CLSBPF_DESTROY;

		} else {

			return -EINVAL;

		}

	} else {

		if (!tc_should_offload(dev, tp, prog->gen_flags))

			return;

			return skip_sw ? -EINVAL : 0;

		cmd = TC_CLSBPF_ADD;

	}



	if (cls_bpf_offload_cmd(tp, obj, cmd))

		return;

	ret = cls_bpf_offload_cmd(tp, obj, cmd);

	if (ret)

		return skip_sw ? ret : 0;



	obj->offloaded = true;

	if (oldprog)

		oldprog->offloaded = false;



	return 0;

}



static void cls_bpf_stop_offload(struct tcf_proto *tp,
@@ -498,7 +510,11 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 
	if (ret < 0)

		goto errout;



	cls_bpf_offload(tp, prog, oldprog);

	ret = cls_bpf_offload(tp, prog, oldprog);

	if (ret) {

		cls_bpf_delete_prog(tp, prog);

		return ret;

	}



	if (oldprog) {

		list_replace_rcu(&oldprog->link, &prog->link);