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ipv6: remove max_size check inline with ipv4
commit af6d10345c
upstream.
In ip6_dst_gc() replace:
if (entries > gc_thresh)
With:
if (entries > ops->gc_thresh)
Sending Ipv6 packets in a loop via a raw socket triggers an issue where a
route is cloned by ip6_rt_cache_alloc() for each packet sent. This quickly
consumes the Ipv6 max_size threshold which defaults to 4096 resulting in
these warnings:
[1] 99.187805] dst_alloc: 7728 callbacks suppressed
[2] Route cache is full: consider increasing sysctl net.ipv6.route.max_size.
.
.
[300] Route cache is full: consider increasing sysctl net.ipv6.route.max_size.
When this happens the packet is dropped and sendto() gets a network is
unreachable error:
remaining pkt 200557 errno 101
remaining pkt 196462 errno 101
.
.
remaining pkt 126821 errno 101
Implement David Aherns suggestion to remove max_size check seeing that Ipv6
has a GC to manage memory usage. Ipv4 already does not check max_size.
Here are some memory comparisons for Ipv4 vs Ipv6 with the patch:
Test by running 5 instances of a program that sends UDP packets to a raw
socket 5000000 times. Compare Ipv4 and Ipv6 performance with a similar
program.
Ipv4:
Before test:
MemFree: 29427108 kB
Slab: 237612 kB
ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 2881 3990 192 42 2 : tunables 0 0 0
During test:
MemFree: 29417608 kB
Slab: 247712 kB
ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 44394 44394 192 42 2 : tunables 0 0 0
After test:
MemFree: 29422308 kB
Slab: 238104 kB
ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0
Ipv6 with patch:
Errno 101 errors are not observed anymore with the patch.
Before test:
MemFree: 29422308 kB
Slab: 238104 kB
ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0
During Test:
MemFree: 29431516 kB
Slab: 240940 kB
ip6_dst_cache 11980 12064 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0
After Test:
MemFree: 29441816 kB
Slab: 238132 kB
ip6_dst_cache 1902 2432 256 32 2 : tunables 0 0 0
xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0
ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0
Tested-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230112012532.311021-1-jmaxwell37@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>
Cc: <stable@vger.kernel.org> # 5.4.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
66b3025202
commit
584756c3d7
3 changed files with 8 additions and 15 deletions
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@ -16,7 +16,7 @@ struct dst_ops {
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unsigned short family;
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unsigned int gc_thresh;
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int (*gc)(struct dst_ops *ops);
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void (*gc)(struct dst_ops *ops);
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struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
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unsigned int (*default_advmss)(const struct dst_entry *);
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unsigned int (*mtu)(const struct dst_entry *);
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@ -83,12 +83,8 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
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if (ops->gc &&
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!(flags & DST_NOCOUNT) &&
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dst_entries_get_fast(ops) > ops->gc_thresh) {
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if (ops->gc(ops)) {
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pr_notice_ratelimited("Route cache is full: consider increasing sysctl net.ipv6.route.max_size.\n");
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return NULL;
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}
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}
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dst_entries_get_fast(ops) > ops->gc_thresh)
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ops->gc(ops);
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dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
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if (!dst)
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@ -88,7 +88,7 @@ static struct dst_entry *ip6_negative_advice(struct dst_entry *);
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static void ip6_dst_destroy(struct dst_entry *);
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static void ip6_dst_ifdown(struct dst_entry *,
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struct net_device *dev, int how);
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static int ip6_dst_gc(struct dst_ops *ops);
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static void ip6_dst_gc(struct dst_ops *ops);
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static int ip6_pkt_discard(struct sk_buff *skb);
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static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
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@ -3207,11 +3207,10 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
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return dst;
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}
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static int ip6_dst_gc(struct dst_ops *ops)
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static void ip6_dst_gc(struct dst_ops *ops)
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{
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struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
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int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
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int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
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int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
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int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
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unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
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@ -3219,11 +3218,10 @@ static int ip6_dst_gc(struct dst_ops *ops)
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int entries;
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entries = dst_entries_get_fast(ops);
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if (entries > rt_max_size)
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if (entries > ops->gc_thresh)
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entries = dst_entries_get_slow(ops);
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if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
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entries <= rt_max_size)
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if (time_after(rt_last_gc + rt_min_interval, jiffies))
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goto out;
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fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true);
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@ -3233,7 +3231,6 @@ static int ip6_dst_gc(struct dst_ops *ops)
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out:
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val = atomic_read(&net->ipv6.ip6_rt_gc_expire);
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atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity));
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return entries > rt_max_size;
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}
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static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
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@ -6321,7 +6318,7 @@ static int __net_init ip6_route_net_init(struct net *net)
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#endif
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net->ipv6.sysctl.flush_delay = 0;
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net->ipv6.sysctl.ip6_rt_max_size = 4096;
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net->ipv6.sysctl.ip6_rt_max_size = INT_MAX;
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net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
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net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
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net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
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