From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9ED87C46467 for ; Wed, 11 Jan 2023 21:34:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234959AbjAKVeG (ORCPT ); Wed, 11 Jan 2023 16:34:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235500AbjAKVeC (ORCPT ); Wed, 11 Jan 2023 16:34:02 -0500 Received: from rpt-cro-asav5.external.tpg.com.au (rpt-cro-asav5.external.tpg.com.au [60.241.0.50]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E4685D13B; Wed, 11 Jan 2023 13:33:58 -0800 (PST) X-Ironport-Abuse: host=202-168-35-241.tpgi.com.au, ip=202.168.35.241, date=01/12/23 08:33:56 X-SMTP-MATCH: 0 X-IPAS-Result: =?us-ascii?q?A2HJAwBbKr9j//EjqMpagRKBRoUMlW6DFogNMAKTaA8BA?= =?us-ascii?q?wEBAQEBTQQBAT4BhEaFGSY3Bg4BAQEEAQEBAQECBQEBAQEBAQMBAQEFAQIBA?= =?us-ascii?q?QEEBQEBAQKBGYUvRoI4KQGEASsLASkdJlwCTYJ+gm4BAzGvfxYFAhaBAZ4YC?= =?us-ascii?q?hkoDWgDgWSBQYRSUIIThChXhzyBFYE8giyCIIhiBIEIjAiMMQEDAgIDAgIDB?= =?us-ascii?q?gMBAgICBQMDAgEDBAIOBA4DAQECAgEBAgQIAgIDAwICCA8VAwcCAQYFAQMBA?= =?us-ascii?q?gYEAgQBCwICBQIBCgECBAECAgIBBQkBAgMBAwELAgIGAgIDBQYEAgMEBgICB?= =?us-ascii?q?QIBAQMCAgINAwIDAgQBBQUBAQIQAgYECQEGAwsCBQEEAwECBQcBAwcDAgICA?= =?us-ascii?q?ggEEgIDAgIEBQICAgECBAUCBwIGAgECAgIEAgEDAgQCAgQCAgQDEQoCAwUDD?= =?us-ascii?q?gICAgICAQkLAgICAgIHBAIDAwEHAgICAQwBAx0DAgICAgICAgIBAwkDBAUKG?= =?us-ascii?q?QMDAiADCQMHBUkCCQMjDwMLCQgHDAEWKAYDAQoHDCUEBAwoAQoMBwUBAgIBB?= =?us-ascii?q?wMDBQUCBw8DBAIBAwMCBQ8DAQYFAQIBAgICBAIIAgQFAgUDAgQCAwICCAMCA?= =?us-ascii?q?wECAQcEAwQBBAIEAw0EAwQCAwICBQICAgICBQICAwECAgICAgIFAgMCAQUBA?= =?us-ascii?q?gIBAgICBAECAgcEAgMBAwQOBAMCAgcBAgIBBgIHAwECAQQDAQEEAgQBAgUCB?= =?us-ascii?q?AEDBgIDAQMKAgMCAQECAwMFAwICCAgCAwUCBAEBAgQDBAICCwEGAgcCAgMCA?= =?us-ascii?q?gQEBAEBAgEEBQIDAQIDAwkCAgMCBAICCgEBAQECAQcCBAUGAgUCAgIDAQICA?= =?us-ascii?q?QMCAQICChEBAQIDAwMEBgUDAwMCARUFAgEBAgIDAwIGAgECCAIEAQQFAgECA?= =?us-ascii?q?QECAgQBCAICAQEBAgECAgMDAgECAgIEAwMBAgECAgMCAgIDAgIBDQIGBgECA?= =?us-ascii?q?gICAgICAgIGAQIBAgMBAgcCBAMCAQICBQICAgMBAQYCBAsBAwICAgIBCAEBA?= =?us-ascii?q?gUBAgICAwEBAwMEAwMFBgMCDAgBBQEDAR8DAgIIAgcCAQYDAgEPAwICAwICA?= =?us-ascii?q?QQKAgMFAgQCAQQIBwIEAQIJAwIGAgYFGAECAgcEDAoBAgIFBgQBAQIDAQIBA?= =?us-ascii?q?QIDAwIDAgQFAQUCAQIEAgICAQECBQ0BAQMEAgQCBwICAgMBBAIBAgEDAwIDA?= =?us-ascii?q?QEBAwYGAgQEAgMDBwICAwECAgMEDQEEAgIGAwQBDQUGBQQDAggBAgEBBwIEA?= =?us-ascii?q?gcJDgIBAgQBBQICAwICAQMCAgECBAMBAgICAgUHBQMEAQQDCgkDAQEEAwIBA?= =?us-ascii?q?gECAwIDBwMCBAIDAQIDBAYGAQkEBgQBDQMEAgIBAgEBAwQEBAICAQICAwEEA?= =?us-ascii?q?gIBAQMDAwICAgMEAgMDCwQKBwMDAgEFCwICAgMCAQEDBwQFBAICBgECBAICA?= =?us-ascii?q?gICAgIDAQEDCgQCAQMCAgQDBgIBAgEJBQIBCQMBAgEDBAEDCQECAgQJAgMHB?= =?us-ascii?q?QoCAgICCAICDgMDAgEBBAICBAMCCQECBwIFAQEDBQcCAgECAgEEAwEJBAECA?= =?us-ascii?q?wIBAQMSAwMBBAICBQMDDQkGAgIBAwIBDQMBAgECAwEEAQUXAwgHFAMFAgIEB?= =?us-ascii?q?AEIAgIDAwMCAQIJBgEDAQUCDgMCAgMDBgECAQECAxACAwEBAQEXAQMEAgMBB?= =?us-ascii?q?AMBAQIBAgMCDgQBBAUMAwECEQwCBAEGAggCAgICAwEDAwUBAgMEAgEIBgQCA?= =?us-ascii?q?gICAQkCCgMCAwECAQUBAwIJAwEFAQIHAgQCAQEBAgIIAggCAwsBAwIDBgIBA?= =?us-ascii?q?gIBBQIBAgIFAwUCAgICBA0CBQICAgYBAgcEAgICAwECAgYCBQECBwcCBQICA?= =?us-ascii?q?gMDCgQEAgoEAQMBAQUBAgEDBAECBAECAQIFAwYCAgICAQICAQIBAQgCAgICA?= =?us-ascii?q?gICAwQCBQOeBgF6FBM4QHEsNoEaAQGUcKwuRCEJAQYCW4FXfBopml2FbRoyq?= =?us-ascii?q?SctlxuRNZEMhXyBQ4IATSOBAW2BSVIZD44sFo5CYTsCBwsBAQMJjCMBAQ?= IronPort-PHdr: A9a23:tRIQNR981HuGM/9uWRC5ngc9DxPPW53KNwIYoqAql6hJOvz6uci4Y QqOub430xfgZsby1bFts6LuqafuWGgNs96qkUspV9hybSIDktgchAc6AcSIWgXRJf/uaDEmT owZDAc2t360PlJIF8ngelbcvmO97SIIGhX4KAF5Ovn5FpTdgsip1+2+4ZnebgpHiDajY755M Qm7oxjWusQKjoRuLbo8xAHUqXVSYeRWwm1oJVOXnxni48q74YBu/SdNtf8/7sBMSar1cbg2Q rxeFzQmLns65Nb3uhnZTAuA/WUTX2MLmRdVGQfF7RX6XpDssivms+d2xSeXMdHqQb0yRD+v9 LlgRgP2hygbNj456GDXhdJ2jKJHuxKquhhzz5fJbI2JKPZye6XQds4YS2VcRMZcTyxPDJ2iY oUSAeQPPuFWoIbyqVYVsRezBhOhCP/1xzNUmnP727Ax3eQ7EQHB2QwtB9YAsHPSrN7oM6kdS ++0zafWwjXHa/NdxDDw6IrNch87rvCNU6x/cc7VyUQhFQ7IlVqQqYn/MDOU0uQBqXSU7+1lV e+2jWMstg5+rCS1yMg2lonJmpwaykrC9ShhwIs7JdO1RVN4bNCqEJVduCOXO5V5T84/XW1lp iI3x70YtJOnfCUHx5spywPQZfGGb4SE/xzuWumeLzp5i3xoe7SyjAux/0i40uDwSNW43EhQo iZYk9TBtWoB2hLT58SdVPdw8Vqt1DCS3A7J8O5EO1o7la/DJp4kxb4/i4QcvFzYHi/zhEX2l KiWdlg4+uSw6+TofLHmppiEOo92jwHxKKsvm8KhDuQ8NggCRXSU+eO51LH7/E35RqtFjuEun 6XHrJzWO94XqrO4DgJWyIou5RayAy243NkXgHULNFdFdwiGj4jtNVHOOvf4DfKnjlSulTdk3 f/HP7P/DZXJKnjOnrXscK1y605Z0gUzzNRf64hIBbEGJfL/Qknxu8fAAR8jLwO02/rnCMl61 o4GRG6CDbeVMLnOvl+Q+uIvP+6MaZcItznnNfgq+fvugGQkllAHY6mmw54XaHS/HvRoP0WVe 3zsjckdEWsSpAoxUPTqiEGeUT5Uf3u9Qb8z5iw+CI28DIbMWJytjaeO3Ce8GZ1WaWRGBU6WH Xj0cIWEXu8AaDiOLc95jjwESb+hRpci1RGzrwD10aFqLunK9S0Cs5Lsytx16/fUlREo+jx4F 96d3H2VT2FogmMIQCc73LhlrkNm1FiD16l4judCFdNN+vxJUh01NYLGw+NmDNDyXxrNfs2VR 1a+XtWmHTYxQ8oxwt8JeEZ9G9uijg3B3yqrGLIVk72LBJop8qPTxnTxJt59y2jH2aU7iFkmW MRPOXW8hqFj7wjTG5LJk0KBmqm3bqQTxi7N+3mZzWqIp0xYUxB/Ub/DXX8BYkvat9P55lnNT 7O2E7QoLhNBydKeKqtNctDpiE9JRO3/ONTfZWK9gWOwCgyVxr6Xb4rlZX8d3CPDB0gAiQwT+ myGNQcmCie7v23eFCBuFU7oY0708+l+r220TksvwgGIaE1uyb61+hALivyGTfMcxLQEtzo/p DVvBlq92MjWC9WYqwp7YKpcec894EtA1W/BrwxyJIGgL6RnhlECcAR6pEDu2AttCoVGj8cqq GkmzA1oKaKXyF9BbS+X3YjsOr3LLWn/5A6gaq7M1VHaytqZ4aYP6O43q1r9pgGkDUUi83B93 NlU13uQ/InFDA0XUZ7pSEY46wB6p63GYik6/47U02NjMbWpvTDcxdIkH/Ulyhm+cNdFKq+EF xH9E9ccB8ewLOwmgV+pbggLPOxK7q47I9umd+ea2K6sJOtgmDOmjWJa4IFyy06M9DRzSvTO3 5kbx/GVxRWHVzjig1e7qMz3mp5LZSsUHmWhzSjoHolRZrd9fYoTE2ehP9W3xslih57qQ3NY9 lujCEkJ2c6nZxWSa1j90ANS2EkMrnynnDG3zz1wkz0zsqWf2ynOz/z4dBUbIm5LWHVijVD0L IeuidAVQVKoYBYzmxe/4Eb13ahaq7plL2TIXEdIeSn2L3tlUqu1rLWOfdRD6JI0sXYfbOPpb VmER7vVrxIE3ibnGGVCgjY2a2KEoJL8yj59jiq4JWZsoX7dMZVywB7P+9HYQaUO9jUDTSh8z zLQAw7vbJGS4dyImsKb4aiFXGW7W8gWKHGzpb4= IronPort-Data: A9a23:PT3B7K5rj1Qh88U33vJpSQxRtFTHchMFZxGqfqrLsTDasY5as4F+v mAZCGHQOqyMZWqkLYhzbo2x/BtQ78fRmtBjSgdlrSlnEysa+MHILOrCIxarNUt+DCFioGGLT Sk6QoOdRCzhZiaE/n9BCpC48T8mk/jgqoPUUIbsIjp2SRJvVBAvgBdin/9RqoNziLBVOSvU0 T/Ji5CZaQHNNwJcaDpOsPra8Uo355wehRtB1rAATaAT1LPhvyRNZH4vDfnZB2f1RIBSAtm7S 47rpF1u1jqEl/uFIorNfofTKiXmcJaLVeS9oiM+t5yZv/R3jndaPpDXlhYrQRw/Zz2hx7idw f0R7sboEV9B0qfkwIzxWDEAe81y0DEvFBYq7hFTvOTKp3AqfUcAzN1zJmcEIrJDvdpWLn0Q7 c40AjRdQhW60rfeLLKTEoGAh+whKcD7I44bvjdryjSx4fQOG8iZBfyUtZkDgXFq2pkm8fX2P qL1bRJtaR3QfBBLPgxIIJ07leaswHL4dlW0rXrP//prujGCklAZPL7FFPHfcPKSYs9vjmGph iXA/E3oJS8oK4nKodaC2jf27gPVpgv3UZwfEZW0/+BnhVmUyHBVDhAKPXO2reS8g1yzR/pQL Esb/idopq83nGSoU9P0dx61uniJulgbQdU4O/Uz4gyLy4LO7gqZD3RCRTlEAPQ3s9Q2SyEo1 3eNntX0FXluqKPLD3WH+d+8oSi7OSUPK0cBaDUCQA9D5MPsyKk2hwjTT9AlFKeopt74Azf9x 3aNtidWr7cUgMoj1aK2+V7KmTSloJTEVUgy/Aq/dnqs8wd8b42NZIGy71Xfq/FaI+6xQ0iIu D4OmtKR4fomApSElSjLS+IIdJmv6uqJPSP0n1FiBd8i+i6r9nrleppfiBl6JUF0IoMHdCXvb Uv7pwxc/tlQMWGsYKsxZJi+Y+woyKHwCtnhUquLRtVLa5l1MgSA+UlGbEicxW3k1k0lgKwlE YqdcNyrCH9AT6V7pAdaXM9HieVun35ugDiOAMqnllK7ybWfInWSTPEMLTNic9wE0U9Nmy2Nm /43CidA40o3vDHWCsUczWLfwZ3m45T26VAaZvG7rtK+Hzc= IronPort-HdrOrdr: A9a23:86xGFahVOu9kSlXfYFznU9WFt3BQXsMji2hC6mlwRA09TyVXra 2TdZMgpHzJYVkqN03I9erqBEDiexPhHOBOj7X5VI3KNDUO01HFEGgN1+HfKkXbehHDyg== X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.96,318,1665406800"; d="scan'208";a="228411964" Received: from 202-168-35-241.tpgi.com.au (HELO jmaxwell.com) ([202.168.35.241]) by rpt-cro-asav5.external.tpg.com.au with ESMTP; 12 Jan 2023 08:33:55 +1100 From: Jon Maxwell To: davem@davemloft.net Cc: edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, yoshfuji@linux-ipv6.org, dsahern@kernel.org, martin.lau@kernel.org, joel@joelfernandes.org, paulmck@kernel.org, eyal.birger@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jon Maxwell , Andrea Mayer Subject: [net-next] ipv6: remove max_size check inline with ipv4 Date: Thu, 12 Jan 2023 08:33:06 +1100 Message-Id: <20230111213306.265239-1-jmaxwell37@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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: # ./a.out -s 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29427108 kB Slab: 237612 kB # grep dst_cache /proc/slabinfo 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29417608 kB Slab: 247712 kB # grep dst_cache /proc/slabinfo 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29422308 kB Slab: 238104 kB # grep dst_cache /proc/slabinfo 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29422308 kB Slab: 238104 kB # grep dst_cache /proc/slabinfo 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29431516 kB Slab: 240940 kB # grep dst_cache /proc/slabinfo 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: # grep -e Slab -e Free /proc/meminfo MemFree: 29441816 kB Slab: 238132 kB # grep dst_cache /proc/slabinfo 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 Signed-off-by: Jon Maxwell --- include/net/dst_ops.h | 2 +- net/core/dst.c | 8 ++------ net/ipv6/route.c | 13 +++++-------- 3 files changed, 8 insertions(+), 15 deletions(-) diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h index 88ff7bb2bb9b..632086b2f644 100644 --- 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 *); diff --git a/net/core/dst.c b/net/core/dst.c index 6d2dd03dafa8..31c08a3386d3 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -82,12 +82,8 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev, 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) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index e74e0361fd92..53b09de61a4a 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -91,7 +91,7 @@ static struct dst_entry *ip6_negative_advice(struct dst_entry *); 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); @@ -3284,11 +3284,10 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 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; @@ -3296,11 +3295,10 @@ static int ip6_dst_gc(struct dst_ops *ops) int entries; entries = dst_entries_get_fast(ops); - if (entries > rt_max_size) + if (entries > 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); @@ -3310,7 +3308,6 @@ static int ip6_dst_gc(struct dst_ops *ops) 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, @@ -6512,7 +6509,7 @@ static int __net_init ip6_route_net_init(struct net *net) #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; -- 2.31.1