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ip6mr: Add refcounting to mfc

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Since ipmr and ip6mr are using the same mr_mfc struct at their core, we
can now refactor the ipmr_cache_{hold,put} logic and apply refcounting
to both ipmr and ip6mr.

Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Mintz 2018-03-26 15:01:36 +03:00 committed by David S. Miller
parent d3c07e5b99
commit 8c13af2a21
6 changed files with 27 additions and 31 deletions
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6
drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
View file

@ -360,7 +360,7 @@ mlxsw_sp_mr_route4_create(struct mlxsw_sp_mr_table *mr_table,
/* Find min_mtu and link iVIF and eVIFs */
mr_route->min_mtu = ETH_MAX_MTU;
ipmr_cache_hold(mfc);
mr_cache_hold(&mfc->_c);
mr_route->mfc4 = mfc;
mr_route->mr_table = mr_table;
for (i = 0; i < MAXVIFS; i++) {
@ -380,7 +380,7 @@ mlxsw_sp_mr_route4_create(struct mlxsw_sp_mr_table *mr_table,
mr_route->route_action = mlxsw_sp_mr_route_action(mr_route);
return mr_route;
err:
ipmr_cache_put(mfc);
mr_cache_put(&mfc->_c);
list_for_each_entry_safe(rve, tmp, &mr_route->evif_list, route_node)
mlxsw_sp_mr_route_evif_unlink(rve);
kfree(mr_route);
@ -393,7 +393,7 @@ static void mlxsw_sp_mr_route4_destroy(struct mlxsw_sp_mr_table *mr_table,
struct mlxsw_sp_mr_route_vif_entry *rve, *tmp;
mlxsw_sp_mr_route_ivif_unlink(mr_route);
ipmr_cache_put(mr_route->mfc4);
mr_cache_put((struct mr_mfc *)mr_route->mfc4);
list_for_each_entry_safe(rve, tmp, &mr_route->evif_list, route_node)
mlxsw_sp_mr_route_evif_unlink(rve);
kfree(mr_route);

6
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View file

@ -5685,11 +5685,11 @@ static void mlxsw_sp_router_fibmr_event_work(struct work_struct *work)
replace);
if (err)
mlxsw_sp_router_fib_abort(mlxsw_sp);
ipmr_cache_put((struct mfc_cache *) fib_work->men_info.mfc);
mr_cache_put(fib_work->men_info.mfc);
break;
case FIB_EVENT_ENTRY_DEL:
mlxsw_sp_router_fibmr_del(mlxsw_sp, &fib_work->men_info);
ipmr_cache_put((struct mfc_cache *) fib_work->men_info.mfc);
mr_cache_put(fib_work->men_info.mfc);
break;
case FIB_EVENT_VIF_ADD:
err = mlxsw_sp_router_fibmr_vif_add(mlxsw_sp,
@ -5769,7 +5769,7 @@ mlxsw_sp_router_fibmr_event(struct mlxsw_sp_fib_event_work *fib_work,
case FIB_EVENT_ENTRY_ADD: /* fall through */
case FIB_EVENT_ENTRY_DEL:
memcpy(&fib_work->men_info, info, sizeof(fib_work->men_info));
ipmr_cache_hold((struct mfc_cache *) fib_work->men_info.mfc);
mr_cache_hold(fib_work->men_info.mfc);
break;
case FIB_EVENT_VIF_ADD: /* fall through */
case FIB_EVENT_VIF_DEL:

19
include/linux/mroute.h
View file

@ -84,23 +84,4 @@ struct rtmsg;
int ipmr_get_route(struct net *net, struct sk_buff *skb,
__be32 saddr, __be32 daddr,
struct rtmsg *rtm, u32 portid);
#ifdef CONFIG_IP_MROUTE
void ipmr_cache_free(struct mfc_cache *mfc_cache);
#else
static inline void ipmr_cache_free(struct mfc_cache *mfc_cache)
{
}
#endif
static inline void ipmr_cache_put(struct mfc_cache *c)
{
if (refcount_dec_and_test(&c->_c.mfc_un.res.refcount))
ipmr_cache_free(c);
}
static inline void ipmr_cache_hold(struct mfc_cache *c)
{
refcount_inc(&c->_c.mfc_un.res.refcount);
}
#endif

13
include/linux/mroute_base.h
View file

@ -125,6 +125,7 @@ enum {
* @refcount: reference count for this entry
* @list: global entry list
* @rcu: used for entry destruction
* @free: Operation used for freeing an entry under RCU
*/
struct mr_mfc {
struct rhlist_head mnode;
@ -150,8 +151,20 @@ struct mr_mfc {
} mfc_un;
struct list_head list;
struct rcu_head rcu;
void (*free)(struct rcu_head *head);
};
static inline void mr_cache_put(struct mr_mfc *c)
{
if (refcount_dec_and_test(&c->mfc_un.res.refcount))
call_rcu(&c->rcu, c->free);
}
static inline void mr_cache_hold(struct mr_mfc *c)
{
refcount_inc(&c->mfc_un.res.refcount);
}
struct mfc_entry_notifier_info {
struct fib_notifier_info info;
struct mr_mfc *mfc;

8
net/ipv4/ipmr.c
View file

@ -732,11 +732,10 @@ static void ipmr_cache_free_rcu(struct rcu_head *head)
kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
}
void ipmr_cache_free(struct mfc_cache *c)
static void ipmr_cache_free(struct mfc_cache *c)
{
call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
}
EXPORT_SYMBOL(ipmr_cache_free);
/* Destroy an unresolved cache entry, killing queued skbs
* and reporting error to netlink readers.
@ -987,6 +986,7 @@ static struct mfc_cache *ipmr_cache_alloc(void)
if (c) {
c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
c->_c.mfc_un.res.minvif = MAXVIFS;
c->_c.free = ipmr_cache_free_rcu;
refcount_set(&c->_c.mfc_un.res.refcount, 1);
}
return c;
@ -1206,7 +1206,7 @@ static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
list_del_rcu(&c->_c.list);
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
mroute_netlink_event(mrt, c, RTM_DELROUTE);
ipmr_cache_put(c);
mr_cache_put(&c->_c);
return 0;
}
@ -1318,7 +1318,7 @@ static void mroute_clean_tables(struct mr_table *mrt, bool all)
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
mrt->id);
mroute_netlink_event(mrt, cache, RTM_DELROUTE);
ipmr_cache_put(cache);
mr_cache_put(c);
}
if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {

6
net/ipv6/ip6mr.c
View file

@ -989,6 +989,8 @@ static struct mfc6_cache *ip6mr_cache_alloc(void)
return NULL;
c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
c->_c.mfc_un.res.minvif = MAXMIFS;
c->_c.free = ip6mr_cache_free_rcu;
refcount_set(&c->_c.mfc_un.res.refcount, 1);
return c;
}
@ -1227,7 +1229,7 @@ static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
FIB_EVENT_ENTRY_DEL, c, mrt->id);
mr6_netlink_event(mrt, c, RTM_DELROUTE);
ip6mr_cache_free(c);
mr_cache_put(&c->_c);
return 0;
}
@ -1516,7 +1518,7 @@ static void mroute_clean_tables(struct mr_table *mrt, bool all)
rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
list_del_rcu(&c->list);
mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
ip6mr_cache_free((struct mfc6_cache *)c);
mr_cache_put(c);
}
if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {