5.15-stable patches

added patches:
	ipv6-remove-max_size-check-inline-with-ipv4.patch

diff --git a/queue-5.15/ipv6-remove-max_size-check-inline-with-ipv4.patch b/queue-5.15/ipv6-remove-max_size-check-inline-with-ipv4.patch
new file mode 100644 (file)
index 0000000..2987b75
--- /dev/null
+++ b/queue-5.15/ipv6-remove-max_size-check-inline-with-ipv4.patch
@@ -0,0 +1,202 @@
+From af6d10345ca76670c1b7c37799f0d5576ccef277 Mon Sep 17 00:00:00 2001
+From: Jon Maxwell <jmaxwell37@gmail.com>
+Date: Thu, 12 Jan 2023 12:25:32 +1100
+Subject: ipv6: remove max_size check inline with ipv4
+
+From: Jon Maxwell <jmaxwell37@gmail.com>
+
+commit af6d10345ca76670c1b7c37799f0d5576ccef277 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>
+Cc: "Jitindar Singh, Suraj" <surajjs@amazon.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ include/net/dst_ops.h |    2 +-
+ net/core/dst.c        |    8 ++------
+ net/ipv6/route.c      |   13 +++++--------
+ 3 files changed, 8 insertions(+), 15 deletions(-)
+
+--- a/include/net/dst_ops.h
++++ b/include/net/dst_ops.h
+@@ -16,7 +16,7 @@ struct dst_ops {
+       unsigned short          family;
+       unsigned int            gc_thresh;
+ 
+-      int                     (*gc)(struct dst_ops *ops);
++      void                    (*gc)(struct dst_ops *ops);
+       struct dst_entry *      (*check)(struct dst_entry *, __u32 cookie);
+       unsigned int            (*default_advmss)(const struct dst_entry *);
+       unsigned int            (*mtu)(const struct dst_entry *);
+--- a/net/core/dst.c
++++ b/net/core/dst.c
+@@ -82,12 +82,8 @@ void *dst_alloc(struct dst_ops *ops, str
+ 
+       if (ops->gc &&
+           !(flags & DST_NOCOUNT) &&
+-          dst_entries_get_fast(ops) > ops->gc_thresh) {
+-              if (ops->gc(ops)) {
+-                      pr_notice_ratelimited("Route cache is full: consider increasing sysctl net.ipv6.route.max_size.\n");
+-                      return NULL;
+-              }
+-      }
++          dst_entries_get_fast(ops) > ops->gc_thresh)
++              ops->gc(ops);
+ 
+       dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
+       if (!dst)
+--- a/net/ipv6/route.c
++++ b/net/ipv6/route.c
+@@ -91,7 +91,7 @@ static struct dst_entry *ip6_negative_ad
+ static void           ip6_dst_destroy(struct dst_entry *);
+ static void           ip6_dst_ifdown(struct dst_entry *,
+                                      struct net_device *dev, int how);
+-static int             ip6_dst_gc(struct dst_ops *ops);
++static void            ip6_dst_gc(struct dst_ops *ops);
+ 
+ static int            ip6_pkt_discard(struct sk_buff *skb);
+ static int            ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+@@ -3295,11 +3295,10 @@ out:
+       return dst;
+ }
+ 
+-static int ip6_dst_gc(struct dst_ops *ops)
++static void ip6_dst_gc(struct dst_ops *ops)
+ {
+       struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
+       int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
+-      int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
+       int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
+       int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
+       unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
+@@ -3307,11 +3306,10 @@ static int ip6_dst_gc(struct dst_ops *op
+       int entries;
+ 
+       entries = dst_entries_get_fast(ops);
+-      if (entries > rt_max_size)
++      if (entries > ops->gc_thresh)
+               entries = dst_entries_get_slow(ops);
+ 
+-      if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
+-          entries <= rt_max_size)
++      if (time_after(rt_last_gc + rt_min_interval, jiffies))
+               goto out;
+ 
+       fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true);
+@@ -3321,7 +3319,6 @@ static int ip6_dst_gc(struct dst_ops *op
+ out:
+       val = atomic_read(&net->ipv6.ip6_rt_gc_expire);
+       atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity));
+-      return entries > rt_max_size;
+ }
+ 
+ static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
+@@ -6528,7 +6525,7 @@ static int __net_init ip6_route_net_init
+ #endif
+ 
+       net->ipv6.sysctl.flush_delay = 0;
+-      net->ipv6.sysctl.ip6_rt_max_size = 4096;
++      net->ipv6.sysctl.ip6_rt_max_size = INT_MAX;
+       net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
+       net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
+       net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;

diff --git a/queue-5.15/series b/queue-5.15/series
index 40c912a58f1f7e1c7e09c25cca6bc948f7b4f76c..1139786f0232b33e10d1fe34941c1212d477ed0e 100644 (file)
--- a/queue-5.15/series
+++ b/queue-5.15/series
@@ -50,3 +50,4 @@ mmc-rpmb-fixes-pause-retune-on-all-rpmb-partitions.patch
 mmc-core-cancel-delayed-work-before-releasing-host.patch
 mmc-sdhci-sprd-fix-emmc-init-failure-after-hw-reset.patch
 net-tls-update-curr-on-splice-as-well.patch
+ipv6-remove-max_size-check-inline-with-ipv4.patch