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net: sched: flower: protect flower classifier state with spinlock 

struct tcf_proto was extended with spinlock to be used by classifiers
instead of global rtnl lock. Use it to protect shared flower classifier
data structures (handle_idr, mask hashtable and list) and fields of
individual filters that can be accessed concurrently. This patch set uses
tcf_proto->lock as per instance lock that protects all filters on
tcf_proto.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2019-03-21 15:17:42 +02:00 committed by David S. Miller
parent 272ffaadeb
commit 3d81e7118d
1 changed files with 32 additions and 7 deletions
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39
net/sched/cls_flower.c
View File

@ -384,7 +384,9 @@ static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f,
cls_flower.cookie = (unsigned long) f;
tc_setup_cb_call(block, TC_SETUP_CLSFLOWER, &cls_flower, false);
spin_lock(&tp->lock);
tcf_block_offload_dec(block, &f->flags);
spin_unlock(&tp->lock);
}
static int fl_hw_replace_filter(struct tcf_proto *tp,
@ -426,7 +428,9 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
return err;
} else if (err > 0) {
f->in_hw_count = err;
spin_lock(&tp->lock);
tcf_block_offload_inc(block, &f->flags);
spin_unlock(&tp->lock);
}
if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW))
@ -514,14 +518,19 @@ static int __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f,
*last = false;
if (f->deleted)
spin_lock(&tp->lock);
if (f->deleted) {
spin_unlock(&tp->lock);
return -ENOENT;
}
f->deleted = true;
rhashtable_remove_fast(&f->mask->ht, &f->ht_node,
f->mask->filter_ht_params);
idr_remove(&head->handle_idr, f->handle);
list_del_rcu(&f->list);
spin_unlock(&tp->lock);
*last = fl_mask_put(head, f->mask, async);
if (!tc_skip_hw(f->flags))
fl_hw_destroy_filter(tp, f, extack);
@ -1500,6 +1509,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
if (!tc_in_hw(fnew->flags))
fnew->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
spin_lock(&tp->lock);
/* tp was deleted concurrently. -EAGAIN will cause caller to lookup
* proto again or create new one, if necessary.
*/
@ -1530,6 +1541,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
list_replace_rcu(&fold->list, &fnew->list);
fold->deleted = true;
spin_unlock(&tp->lock);
fl_mask_put(head, fold->mask, true);
if (!tc_skip_hw(fold->flags))
fl_hw_destroy_filter(tp, fold, NULL);
@ -1575,6 +1588,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
goto errout_idr;
list_add_tail_rcu(&fnew->list, &fnew->mask->filters);
spin_unlock(&tp->lock);
}
*arg = fnew;
@ -1586,6 +1600,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
errout_idr:
idr_remove(&head->handle_idr, fnew->handle);
errout_hw:
spin_unlock(&tp->lock);
if (!tc_skip_hw(fnew->flags))
fl_hw_destroy_filter(tp, fnew, NULL);
errout_mask:
@ -1688,8 +1703,10 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
continue;
}
spin_lock(&tp->lock);
tc_cls_offload_cnt_update(block, &f->in_hw_count,
&f->flags, add);
spin_unlock(&tp->lock);
}
}
@ -2223,6 +2240,7 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
struct cls_fl_filter *f = fh;
struct nlattr *nest;
struct fl_flow_key *key, *mask;
bool skip_hw;
if (!f)
return skb->len;
@ -2233,21 +2251,26 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
if (!nest)
goto nla_put_failure;
spin_lock(&tp->lock);
if (f->res.classid &&
nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
goto nla_put_failure;
goto nla_put_failure_locked;
key = &f->key;
mask = &f->mask->key;
skip_hw = tc_skip_hw(f->flags);
if (fl_dump_key(skb, net, key, mask))
goto nla_put_failure;
if (!tc_skip_hw(f->flags))
fl_hw_update_stats(tp, f);
goto nla_put_failure_locked;
if (f->flags && nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags))
goto nla_put_failure;
goto nla_put_failure_locked;
spin_unlock(&tp->lock);
if (!skip_hw)
fl_hw_update_stats(tp, f);
if (nla_put_u32(skb, TCA_FLOWER_IN_HW_COUNT, f->in_hw_count))
goto nla_put_failure;
@ -2262,6 +2285,8 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, void *fh,
return skb->len;
nla_put_failure_locked:
spin_unlock(&tp->lock);
nla_put_failure:
nla_nest_cancel(skb, nest);
return -1;