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net/sched: Add match-all classifier hw offloading.

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Following the work that have been done on offloading classifiers like u32
and flower, now the match-all classifier hw offloading is possible. if
the interface supports tc offloading.

To control the offloading, two tc flags have been introduced: skip_sw and
skip_hw. Typical usage:

tc filter add dev eth25 parent ffff: 	\
	matchall skip_sw		\
	action mirred egress mirror	\
	dev eth27

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yotam Gigi 2016-07-21 12:03:12 +02:00 committed by David S. Miller
parent bf3994d2ed
commit b87f7936a9
4 changed files with 87 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/netdevice.h
View file

@ -787,6 +787,7 @@ enum {
TC_SETUP_MQPRIO,
TC_SETUP_CLSU32,
TC_SETUP_CLSFLOWER,
TC_SETUP_MATCHALL,
};
struct tc_cls_u32_offload;
@ -797,6 +798,7 @@ struct tc_to_netdev {
u8 tc;
struct tc_cls_u32_offload *cls_u32;
struct tc_cls_flower_offload *cls_flower;
struct tc_cls_matchall_offload *cls_mall;
};
};

11
include/net/pkt_cls.h
View file

@ -442,4 +442,15 @@ struct tc_cls_flower_offload {
struct tcf_exts *exts;
};
enum tc_matchall_command {
TC_CLSMATCHALL_REPLACE,
TC_CLSMATCHALL_DESTROY,
};
struct tc_cls_matchall_offload {
enum tc_matchall_command command;
struct tcf_exts *exts;
unsigned long cookie;
};
#endif

1
include/uapi/linux/pkt_cls.h
View file

@ -439,6 +439,7 @@ enum {
TCA_MATCHALL_UNSPEC,
TCA_MATCHALL_CLASSID,
TCA_MATCHALL_ACT,
TCA_MATCHALL_FLAGS,
__TCA_MATCHALL_MAX,
};

76
net/sched/cls_matchall.c
View file

@ -21,6 +21,7 @@ struct cls_mall_filter {
struct tcf_result res;
u32 handle;
struct rcu_head rcu;
u32 flags;
};
struct cls_mall_head {
@ -34,6 +35,9 @@ static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct cls_mall_head *head = rcu_dereference_bh(tp->root);
struct cls_mall_filter *f = head->filter;
if (tc_skip_sw(f->flags))
return -1;
return tcf_exts_exec(skb, &f->exts, res);
}
@ -55,18 +59,61 @@ static void mall_destroy_filter(struct rcu_head *head)
struct cls_mall_filter *f = container_of(head, struct cls_mall_filter, rcu);
tcf_exts_destroy(&f->exts);
kfree(f);
}
static int mall_replace_hw_filter(struct tcf_proto *tp,
struct cls_mall_filter *f,
unsigned long cookie)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_to_netdev offload;
struct tc_cls_matchall_offload mall_offload = {0};
offload.type = TC_SETUP_MATCHALL;
offload.cls_mall = &mall_offload;
offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
offload.cls_mall->exts = &f->exts;
offload.cls_mall->cookie = cookie;
return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
&offload);
}
static void mall_destroy_hw_filter(struct tcf_proto *tp,
struct cls_mall_filter *f,
unsigned long cookie)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_to_netdev offload;
struct tc_cls_matchall_offload mall_offload = {0};
offload.type = TC_SETUP_MATCHALL;
offload.cls_mall = &mall_offload;
offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
offload.cls_mall->exts = NULL;
offload.cls_mall->cookie = cookie;
dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
&offload);
}
static bool mall_destroy(struct tcf_proto *tp, bool force)
{
struct cls_mall_head *head = rtnl_dereference(tp->root);
struct net_device *dev = tp->q->dev_queue->dev;
struct cls_mall_filter *f = head->filter;
if (!force && head->filter)
if (!force && f)
return false;
if (head->filter)
call_rcu(&head->filter->rcu, mall_destroy_filter);
if (f) {
if (tc_should_offload(dev, tp, f->flags))
mall_destroy_hw_filter(tp, f, (unsigned long) f);
call_rcu(&f->rcu, mall_destroy_filter);
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
return true;
@ -117,8 +164,10 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
{
struct cls_mall_head *head = rtnl_dereference(tp->root);
struct cls_mall_filter *fold = (struct cls_mall_filter *) *arg;
struct net_device *dev = tp->q->dev_queue->dev;
struct cls_mall_filter *f;
struct nlattr *tb[TCA_MATCHALL_MAX + 1];
u32 flags = 0;
int err;
if (!tca[TCA_OPTIONS])
@ -135,6 +184,12 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
if (err < 0)
return err;
if (tb[TCA_MATCHALL_FLAGS]) {
flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
if (!tc_flags_valid(flags))
return -EINVAL;
}
f = kzalloc(sizeof(*f), GFP_KERNEL);
if (!f)
return -ENOBUFS;
@ -144,11 +199,22 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
if (!handle)
handle = 1;
f->handle = handle;
f->flags = flags;
err = mall_set_parms(net, tp, f, base, tb, tca[TCA_RATE], ovr);
if (err)
goto errout;
if (tc_should_offload(dev, tp, flags)) {
err = mall_replace_hw_filter(tp, f, (unsigned long) f);
if (err) {
if (tc_skip_sw(flags))
goto errout;
else
err = 0;
}
}
*arg = (unsigned long) f;
rcu_assign_pointer(head->filter, f);
@ -163,6 +229,10 @@ static int mall_delete(struct tcf_proto *tp, unsigned long arg)
{
struct cls_mall_head *head = rtnl_dereference(tp->root);
struct cls_mall_filter *f = (struct cls_mall_filter *) arg;
struct net_device *dev = tp->q->dev_queue->dev;
if (tc_should_offload(dev, tp, f->flags))
mall_destroy_hw_filter(tp, f, (unsigned long) f);
RCU_INIT_POINTER(head->filter, NULL);
tcf_unbind_filter(tp, &f->res);