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net: sched: extend proto ops to support unlocked classifiers

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Add 'rtnl_held' flag to tcf proto change, delete, destroy, dump, walk
functions to track rtnl lock status. Extend users of these function in cls
API to propagate rtnl lock status to them. This allows classifiers to
obtain rtnl lock when necessary and to pass rtnl lock status to extensions
and driver offload callbacks.

Add flags field to tcf proto ops. Add flag value to indicate that
classifier doesn't require rtnl lock.

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
2019-02-11 10:55:45 +02:00
committed by David S. Miller
parent 7d5509fa0d
commit 12db03b65c
15 changed files with 191 additions and 141 deletions
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13
net/sched/cls_flow.c
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@@ -391,7 +391,8 @@ static void flow_destroy_filter_work(struct work_struct *work)
static int flow_change(struct net *net, struct sk_buff *in_skb,
struct tcf_proto *tp, unsigned long base,
u32 handle, struct nlattr **tca,
void **arg, bool ovr, struct netlink_ext_ack *extack)
void **arg, bool ovr, bool rtnl_held,
struct netlink_ext_ack *extack)
{
struct flow_head *head = rtnl_dereference(tp->root);
struct flow_filter *fold, *fnew;
@@ -566,7 +567,7 @@ err1:
}
static int flow_delete(struct tcf_proto *tp, void *arg, bool *last,
struct netlink_ext_ack *extack)
bool rtnl_held, struct netlink_ext_ack *extack)
{
struct flow_head *head = rtnl_dereference(tp->root);
struct flow_filter *f = arg;
@@ -590,7 +591,8 @@ static int flow_init(struct tcf_proto *tp)
return 0;
}
static void flow_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
static void flow_destroy(struct tcf_proto *tp, bool rtnl_held,
struct netlink_ext_ack *extack)
{
struct flow_head *head = rtnl_dereference(tp->root);
struct flow_filter *f, *next;
@@ -617,7 +619,7 @@ static void *flow_get(struct tcf_proto *tp, u32 handle)
}
static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh,
struct sk_buff *skb, struct tcmsg *t)
struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
{
struct flow_filter *f = fh;
struct nlattr *nest;
@@ -677,7 +679,8 @@ nla_put_failure:
return -1;
}
static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg,
bool rtnl_held)
{
struct flow_head *head = rtnl_dereference(tp->root);
struct flow_filter *f;