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netns: ipmr: declare counter cache_resolve_queue_len per-namespace 

Preliminary work to make IPv4 multicast routing netns-aware.

Declare variable cache_resolve_queue_len per-namespace: move it into
struct netns_ipv4.

This variable counts the number of unresolved cache entries queued in the
list mfc_unres_queue. This list is kept global to all netns as the number
of entries per namespace is limited to 10 (hardcoded in routine
ipmr_cache_unresolved).
Entries belonging to different namespaces in mfc_unres_queue will be
identified by matching the mfc_net member introduced previously in
struct mfc_cache.

Keeping this list global to all netns, also allows us to keep a single
timer (ipmr_expire_timer) to handle their expiration.
In some places cache_resolve_queue_len value was tested for arming
or deleting the timer. These tests were equivalent to testing
mfc_unres_queue value instead and are replaced in this patch.

At the moment, cache_resolve_queue_len is only referenced in init_net.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Thery 2009-01-22 04:56:19 +00:00 committed by David S. Miller
parent 2bb8b26c3e
commit 1e8fb3b6a4
2 changed files with 22 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/netns/ipv4.h
View File

@ -60,6 +60,7 @@ struct netns_ipv4 {
struct mfc_cache **mfc_cache_array;
struct vif_device *vif_table;
int maxvif;
atomic_t cache_resolve_queue_len;
#endif
};
#endif

39
net/ipv4/ipmr.c
View File

@ -83,7 +83,6 @@ static int mroute_do_assert; /* Set in PIM assert */
static int mroute_do_pim;
static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len; /* Size of unresolved */
/* Special spinlock for queue of unresolved entries */
static DEFINE_SPINLOCK(mfc_unres_lock);
@ -340,7 +339,7 @@ static void ipmr_destroy_unres(struct mfc_cache *c)
struct sk_buff *skb;
struct nlmsgerr *e;
atomic_dec(&cache_resolve_queue_len);
atomic_dec(&init_net.ipv4.cache_resolve_queue_len);
while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
if (ip_hdr(skb)->version == 0) {
@ -374,7 +373,7 @@ static void ipmr_expire_process(unsigned long dummy)
return;
}
if (atomic_read(&cache_resolve_queue_len) == 0)
if (mfc_unres_queue == NULL)
goto out;
now = jiffies;
@ -395,7 +394,7 @@ static void ipmr_expire_process(unsigned long dummy)
ipmr_destroy_unres(c);
}
if (atomic_read(&cache_resolve_queue_len))
if (mfc_unres_queue != NULL)
mod_timer(&ipmr_expire_timer, jiffies + expires);
out:
@ -690,7 +689,8 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
spin_lock_bh(&mfc_unres_lock);
for (c=mfc_unres_queue; c; c=c->next) {
if (c->mfc_mcastgrp == iph->daddr &&
if (net_eq(mfc_net(c), &init_net) &&
c->mfc_mcastgrp == iph->daddr &&
c->mfc_origin == iph->saddr)
break;
}
@ -700,7 +700,7 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
* Create a new entry if allowable
*/
if (atomic_read(&cache_resolve_queue_len) >= 10 ||
if (atomic_read(&init_net.ipv4.cache_resolve_queue_len) >= 10 ||
(c = ipmr_cache_alloc_unres(&init_net)) == NULL) {
spin_unlock_bh(&mfc_unres_lock);
@ -729,7 +729,7 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
return err;
}
atomic_inc(&cache_resolve_queue_len);
atomic_inc(&init_net.ipv4.cache_resolve_queue_len);
c->next = mfc_unres_queue;
mfc_unres_queue = c;
@ -827,14 +827,16 @@ static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock)
spin_lock_bh(&mfc_unres_lock);
for (cp = &mfc_unres_queue; (uc=*cp) != NULL;
cp = &uc->next) {
if (uc->mfc_origin == c->mfc_origin &&
if (net_eq(mfc_net(uc), &init_net) &&
uc->mfc_origin == c->mfc_origin &&
uc->mfc_mcastgrp == c->mfc_mcastgrp) {
*cp = uc->next;
if (atomic_dec_and_test(&cache_resolve_queue_len))
del_timer(&ipmr_expire_timer);
atomic_dec(&init_net.ipv4.cache_resolve_queue_len);
break;
}
}
if (mfc_unres_queue == NULL)
del_timer(&ipmr_expire_timer);
spin_unlock_bh(&mfc_unres_lock);
if (uc) {
@ -880,18 +882,19 @@ static void mroute_clean_tables(struct sock *sk)
}
}
if (atomic_read(&cache_resolve_queue_len) != 0) {
struct mfc_cache *c;
if (atomic_read(&init_net.ipv4.cache_resolve_queue_len) != 0) {
struct mfc_cache *c, **cp;
spin_lock_bh(&mfc_unres_lock);
while (mfc_unres_queue != NULL) {
c = mfc_unres_queue;
mfc_unres_queue = c->next;
spin_unlock_bh(&mfc_unres_lock);
cp = &mfc_unres_queue;
while ((c = *cp) != NULL) {
if (!net_eq(mfc_net(c), &init_net)) {
cp = &c->next;
continue;
}
*cp = c->next;
ipmr_destroy_unres(c);
spin_lock_bh(&mfc_unres_lock);
}
spin_unlock_bh(&mfc_unres_lock);
}