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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

29
net/ipv6/route.c
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@@ -1270,7 +1270,7 @@ static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
{
struct rt6_info *pcpu_rt, **p;
p = this_cpu_ptr(res->f6i->rt6i_pcpu);
p = this_cpu_ptr(res->nh->rt6i_pcpu);
pcpu_rt = *p;
if (pcpu_rt)
@@ -1291,7 +1291,7 @@ static struct rt6_info *rt6_make_pcpu_route(struct net *net,
}
dst_hold(&pcpu_rt->dst);
p = this_cpu_ptr(res->f6i->rt6i_pcpu);
p = this_cpu_ptr(res->nh->rt6i_pcpu);
prev = cmpxchg(p, NULL, pcpu_rt);
BUG_ON(prev);
@@ -3068,6 +3068,12 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
!netif_carrier_ok(dev))
fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
if (!fib6_nh->rt6i_pcpu) {
err = -ENOMEM;
goto out;
}
err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
cfg->fc_encap_type, cfg, gfp_flags, extack);
if (err)
@@ -3092,6 +3098,25 @@ out:
void fib6_nh_release(struct fib6_nh *fib6_nh)
{
if (fib6_nh->rt6i_pcpu) {
int cpu;
for_each_possible_cpu(cpu) {
struct rt6_info **ppcpu_rt;
struct rt6_info *pcpu_rt;
ppcpu_rt = per_cpu_ptr(fib6_nh->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(fib6_nh->rt6i_pcpu);
}
fib_nh_common_release(&fib6_nh->nh_common);
}