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net: sched: notify classifier on successful offload add/delete 

To remove dependency on rtnl lock, extend classifier ops with new
ops->hw_add() and ops->hw_del() callbacks. Call them from cls API while
holding cb_lock every time filter if successfully added to or deleted from
hardware.

Implement the new API in flower classifier. Use it to manage hw_filters
list under cb_lock protection, instead of relying on rtnl lock to
synchronize with concurrent fl_reoffload() call.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2019-08-26 16:45:00 +03:00 committed by David S. Miller
parent 4011921137
commit a449a3e77a
3 changed files with 47 additions and 9 deletions
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4
include/net/sch_generic.h
View File

@ -312,6 +312,10 @@ struct tcf_proto_ops {
int (*reoffload)(struct tcf_proto *tp, bool add,
flow_setup_cb_t *cb, void *cb_priv,
struct netlink_ext_ack *extack);
void (*hw_add)(struct tcf_proto *tp,
void *type_data);
void (*hw_del)(struct tcf_proto *tp,
void *type_data);
void (*bind_class)(void *, u32, unsigned long);
void * (*tmplt_create)(struct net *net,
struct tcf_chain *chain,

19
net/sched/cls_api.c
View File

@ -3099,6 +3099,11 @@ int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
}
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
if (ok_count < 0)
goto err_unlock;
if (tp->ops->hw_add)
tp->ops->hw_add(tp, type_data);
if (ok_count > 0)
tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
ok_count, true);
@ -3130,11 +3135,18 @@ int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
}
tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
if (tp->ops->hw_del)
tp->ops->hw_del(tp, type_data);
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
if (ok_count < 0)
goto err_unlock;
if (tp->ops->hw_add)
tp->ops->hw_add(tp, type_data);
if (ok_count > 0)
tc_cls_offload_cnt_update(block, tp, new_in_hw_count, new_flags,
ok_count, true);
tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
new_flags, ok_count, true);
err_unlock:
up_read(&block->cb_lock);
return ok_count < 0 ? ok_count : 0;
@ -3155,6 +3167,9 @@ int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
if (tp->ops->hw_del)
tp->ops->hw_del(tp, type_data);
up_read(&block->cb_lock);
return ok_count < 0 ? ok_count : 0;
}

33
net/sched/cls_flower.c
View File

@ -421,9 +421,6 @@ static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f,
tc_setup_cb_destroy(block, tp, TC_SETUP_CLSFLOWER, &cls_flower, false,
&f->flags, &f->in_hw_count, true);
spin_lock(&tp->lock);
list_del_init(&f->hw_list);
spin_unlock(&tp->lock);
if (!rtnl_held)
rtnl_unlock();
@ -433,7 +430,6 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
struct cls_fl_filter *f, bool rtnl_held,
struct netlink_ext_ack *extack)
{
struct cls_fl_head *head = fl_head_dereference(tp);
struct tcf_block *block = tp->chain->block;
struct flow_cls_offload cls_flower = {};
bool skip_sw = tc_skip_sw(f->flags);
@ -480,9 +476,6 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
goto errout;
}
spin_lock(&tp->lock);
list_add(&f->hw_list, &head->hw_filters);
spin_unlock(&tp->lock);
errout:
if (!rtnl_held)
rtnl_unlock();
@ -1856,6 +1849,30 @@ next_flow:
return 0;
}
static void fl_hw_add(struct tcf_proto *tp, void *type_data)
{
struct flow_cls_offload *cls_flower = type_data;
struct cls_fl_filter *f =
(struct cls_fl_filter *) cls_flower->cookie;
struct cls_fl_head *head = fl_head_dereference(tp);
spin_lock(&tp->lock);
list_add(&f->hw_list, &head->hw_filters);
spin_unlock(&tp->lock);
}
static void fl_hw_del(struct tcf_proto *tp, void *type_data)
{
struct flow_cls_offload *cls_flower = type_data;
struct cls_fl_filter *f =
(struct cls_fl_filter *) cls_flower->cookie;
spin_lock(&tp->lock);
if (!list_empty(&f->hw_list))
list_del_init(&f->hw_list);
spin_unlock(&tp->lock);
}
static int fl_hw_create_tmplt(struct tcf_chain *chain,
struct fl_flow_tmplt *tmplt)
{
@ -2516,6 +2533,8 @@ static struct tcf_proto_ops cls_fl_ops __read_mostly = {
.delete = fl_delete,
.walk = fl_walk,
.reoffload = fl_reoffload,
.hw_add = fl_hw_add,
.hw_del = fl_hw_del,
.dump = fl_dump,
.bind_class = fl_bind_class,
.tmplt_create = fl_tmplt_create,