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ipv6: Move pcpu cached routes to fib6_nh

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rt6_info are specific instances of a fib entry and are tied to a
device and gateway - ie., a nexthop. Before nexthop objects, IPv6 fib
entries have separate fib6_info for each nexthop in a multipath route,
so the location of the pcpu cache in the fib6_info struct worked.
However, with nexthop objects a fib6_info can point to a set of nexthops
(yet another alignment of ipv6 with ipv4). Accordingly, the pcpu
cache needs to be moved to the fib6_nh struct so the cached entries
are local to the nexthop specification used to create the rt6_info.

Initialization and free of the pcpu entries moved to fib6_nh_init and
fib6_nh_release.

Change in location only, from fib6_info down to fib6_nh; no other
functional change intended.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2019-05-22 20:27:55 -07:00
committed by David S. Miller
parent daeceb2df3
commit f40b6ae2b6
4 changed files with 38 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
net/ipv6/ip6_fib.c
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@@ -155,12 +155,6 @@ struct fib6_info *fib6_info_alloc(gfp_t gfp_flags)
if (!f6i)
return NULL;
f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
if (!f6i->rt6i_pcpu) {
kfree(f6i);
return NULL;
}
INIT_LIST_HEAD(&f6i->fib6_siblings);
refcount_set(&f6i->fib6_ref, 1);
@@ -177,25 +171,6 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
kfree(bucket);
if (f6i->rt6i_pcpu) {
int cpu;
for_each_possible_cpu(cpu) {
struct rt6_info **ppcpu_rt;
struct rt6_info *pcpu_rt;
ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
pcpu_rt = *ppcpu_rt;
if (pcpu_rt) {
dst_dev_put(&pcpu_rt->dst);
dst_release(&pcpu_rt->dst);
*ppcpu_rt = NULL;
}
}
free_percpu(f6i->rt6i_pcpu);
}
fib6_nh_release(&f6i->fib6_nh);
ip_fib_metrics_put(f6i->fib6_metrics);
@@ -902,8 +877,12 @@ insert_above:
static void fib6_drop_pcpu_from(struct fib6_info *f6i,
const struct fib6_table *table)
{
struct fib6_nh *fib6_nh = &f6i->fib6_nh;
int cpu;
if (!fib6_nh->rt6i_pcpu)
return;
/* Make sure rt6_make_pcpu_route() wont add other percpu routes
* while we are cleaning them here.
*/
@@ -917,7 +896,7 @@ static void fib6_drop_pcpu_from(struct fib6_info *f6i,
struct rt6_info **ppcpu_rt;
struct rt6_info *pcpu_rt;
ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
pcpu_rt = *ppcpu_rt;
if (pcpu_rt) {
struct fib6_info *from;
@@ -933,8 +912,7 @@ static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn,
{
struct fib6_table *table = rt->fib6_table;
if (rt->rt6i_pcpu)
fib6_drop_pcpu_from(rt, table);
fib6_drop_pcpu_from(rt, table);
if (refcount_read(&rt->fib6_ref) != 1) {
/* This route is used as dummy address holder in some split