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net/flower: Introduce hardware offload support 

This patch is based on a patch made by John Fastabend.
It adds support for offloading cls_flower.
when NETIF_F_HW_TC is on:
  flags = 0       => Rule will be processed twice - by hardware, and if
                     still relevant, by software.
  flags = SKIP_HW => Rull will be processed by software only

If hardware fail/not capabale to apply the rule, operation will NOT
fail. Filter will be processed by SW only.

Acked-by: Jiri Pirko <jiri@mellanox.com>
Suggested-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Amir Vadai <amir@vadai.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2016-03-08 12:42:29 +02:00 committed by David S. Miller
parent 10f79037b4
commit 5b33f48842
4 changed files with 81 additions and 1 deletions
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2
include/linux/netdevice.h
View File

@ -786,6 +786,7 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
enum {
TC_SETUP_MQPRIO,
TC_SETUP_CLSU32,
TC_SETUP_CLSFLOWER,
};
struct tc_cls_u32_offload;
@ -795,6 +796,7 @@ struct tc_to_netdev {
union {
u8 tc;
struct tc_cls_u32_offload *cls_u32;
struct tc_cls_flower_offload *cls_flower;
};
};

14
include/net/pkt_cls.h
View File

@ -409,4 +409,18 @@ static inline bool tc_should_offload(struct net_device *dev, u32 flags)
return true;
}
enum tc_fl_command {
TC_CLSFLOWER_REPLACE,
TC_CLSFLOWER_DESTROY,
};
struct tc_cls_flower_offload {
enum tc_fl_command command;
u64 cookie;
struct flow_dissector *dissector;
struct fl_flow_key *mask;
struct fl_flow_key *key;
struct tcf_exts *exts;
};
#endif

2
include/uapi/linux/pkt_cls.h
View File

@ -417,6 +417,8 @@ enum {
TCA_FLOWER_KEY_TCP_DST, /* be16 */
TCA_FLOWER_KEY_UDP_SRC, /* be16 */
TCA_FLOWER_KEY_UDP_DST, /* be16 */
TCA_FLOWER_FLAGS,
__TCA_FLOWER_MAX,
};

64
net/sched/cls_flower.c
View File

@ -165,6 +165,51 @@ static void fl_destroy_filter(struct rcu_head *head)
kfree(f);
}
static void fl_hw_destroy_filter(struct tcf_proto *tp, u64 cookie)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_flower_offload offload = {0};
struct tc_to_netdev tc;
if (!tc_should_offload(dev, 0))
return;
offload.command = TC_CLSFLOWER_DESTROY;
offload.cookie = cookie;
tc.type = TC_SETUP_CLSFLOWER;
tc.cls_flower = &offload;
dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
}
static void fl_hw_replace_filter(struct tcf_proto *tp,
struct flow_dissector *dissector,
struct fl_flow_key *mask,
struct fl_flow_key *key,
struct tcf_exts *actions,
u64 cookie, u32 flags)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_flower_offload offload = {0};
struct tc_to_netdev tc;
if (!tc_should_offload(dev, flags))
return;
offload.command = TC_CLSFLOWER_REPLACE;
offload.cookie = cookie;
offload.dissector = dissector;
offload.mask = mask;
offload.key = key;
offload.exts = actions;
tc.type = TC_SETUP_CLSFLOWER;
tc.cls_flower = &offload;
dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
}
static bool fl_destroy(struct tcf_proto *tp, bool force)
{
struct cls_fl_head *head = rtnl_dereference(tp->root);
@ -174,6 +219,7 @@ static bool fl_destroy(struct tcf_proto *tp, bool force)
return false;
list_for_each_entry_safe(f, next, &head->filters, list) {
fl_hw_destroy_filter(tp, (u64)f);
list_del_rcu(&f->list);
call_rcu(&f->rcu, fl_destroy_filter);
}
@ -459,6 +505,7 @@ 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])
@ -486,6 +533,9 @@ 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]);
err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
if (err)
goto errout;
@ -498,9 +548,20 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
head->ht_params);
if (err)
goto errout;
if (fold)
fl_hw_replace_filter(tp,
&head->dissector,
&mask.key,
&fnew->key,
&fnew->exts,
(u64)fnew,
flags);
if (fold) {
rhashtable_remove_fast(&head->ht, &fold->ht_node,
head->ht_params);
fl_hw_destroy_filter(tp, (u64)fold);
}
*arg = (unsigned long) fnew;
@ -527,6 +588,7 @@ static int fl_delete(struct tcf_proto *tp, unsigned long arg)
rhashtable_remove_fast(&head->ht, &f->ht_node,
head->ht_params);
list_del_rcu(&f->list);
fl_hw_destroy_filter(tp, (u64)f);
tcf_unbind_filter(tp, &f->res);
call_rcu(&f->rcu, fl_destroy_filter);
return 0;