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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: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
steinar/wifi_calib_4_9_kernel
Jakub Kicinski 2016-09-21 11:43:55 +01:00 committed by David S. Miller
parent 0d01d45f1b
commit eadb41489f
1 changed files with 25 additions and 9 deletions
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34
net/sched/cls_bpf.c
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@ -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,
struct cls_bpf_prog *oldprog)
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);