Message ID | 1484331253-5908-3-git-send-email-rshearma@brocade.com |
---|---|
State | Changes Requested, archived |
Delegated to: | David Miller |
Headers | show |
On 1/13/17, 10:14 AM, Robert Shearman wrote: > Having MPLS packet stats is useful for observing network operation and > for diagnosing network problems. In the absence of anything better, > RFC2863 and RFC3813 are used for guidance for which stats to expose > and the semantics of them. In particular rx_noroutes maps to in > unknown protos in RFC2863. The stats are exposed to userspace via > AF_MPLS attributes embedded in the IFLA_STATS_AF_SPEC attribute of > RTM_GETSTATS messages. > > All the introduced fields are 64-bit, even error ones, to ensure no > overflow with long uptimes. Per-CPU counters are used to avoid > cache-line contention on the commonly used fields. The other fields > have also been made per-CPU for code to avoid performance problems in > error conditions on the assumption that on some platforms the cost of > atomic operations could be more expensive than sending the packet > (which is what would be done in the success case). If that's not the > case, we could instead not use per-CPU counters for these fields. > > Only unicast and non-fragment are exposed at the moment, but other > counters can be exposed in the future either by adding to the end of > struct mpls_link_stats or by additional netlink attributes in the > AF_MPLS IFLA_STATS_AF_SPEC nested attribute. > > Signed-off-by: Robert Shearman <rshearma@brocade.com> > --- > Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Hi Robert, [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Robert-Shearman/net-AF-specific-RTM_GETSTATS-attributes/20170114-095819 config: x86_64-randconfig-u0-01141334 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All error/warnings (new ones prefixed by >>): In file included from include/net/netns/mib.h:4:0, from include/net/net_namespace.h:14, from include/linux/netdevice.h:43, from include/uapi/linux/if_arp.h:26, from include/linux/if_arp.h:27, from net/mpls/af_mpls.c:7: net/mpls/af_mpls.c: In function 'mpls_stats_inc_outucastpkts': >> include/net/ipv6.h:163:35: error: 'struct netns_mib' has no member named 'ipv6_statistics'; did you mean 'ip_statistics'? mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/snmp.h:145:15: note: in definition of macro 'SNMP_UPD_PO_STATS' __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ ^~~ >> include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^~~~~~~ >> net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^~~~~~~~~~~~~~~~ >> include/net/ipv6.h:163:35: error: 'struct netns_mib' has no member named 'ipv6_statistics'; did you mean 'ip_statistics'? mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/snmp.h:145:37: note: in definition of macro 'SNMP_UPD_PO_STATS' __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ ^~~ >> include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^~~~~~~ >> net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^~~~~~~~~~~~~~~~ In file included from include/asm-generic/percpu.h:6:0, from arch/x86/include/asm/percpu.h:542, from arch/x86/include/asm/preempt.h:5, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mm_types.h:8, from include/linux/kmemcheck.h:4, from include/linux/skbuff.h:18, from net/mpls/af_mpls.c:2: >> include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/linux/percpu-defs.h:206:47: note: in definition of macro '__verify_pcpu_ptr' const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \ ^~~ include/linux/percpu-defs.h:496:33: note: in expansion of macro '__pcpu_size_call' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^~~~~~~~~~~~ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^~~~~~~~~~~~ >> include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^~~~~~~~~~~~~~~~~ >> include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^~~~~~~ >> net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^~~~~~~~~~~~~~~~ >> include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/linux/percpu-defs.h:363:16: note: in definition of macro '__pcpu_size_call' switch(sizeof(variable)) { \ ^~~~~~~~ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^~~~~~~~~~~~ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^~~~~~~~~~~~ >> include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^~~~~~~~~~~~~~~~~ >> include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^~~~~~~ >> net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^~~~~~~~~~~~~~~~ In file included from arch/x86/include/asm/preempt.h:5:0, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mm_types.h:8, from include/linux/kmemcheck.h:4, from include/linux/skbuff.h:18, from net/mpls/af_mpls.c:2: >> include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ arch/x86/include/asm/percpu.h:128:17: note: in definition of macro 'percpu_add_op' typedef typeof(var) pao_T__; \ ^~~ include/linux/percpu-defs.h:364:11: note: in expansion of macro 'this_cpu_add_1' case 1: stem##1(variable, __VA_ARGS__);break; \ ^~~~ include/linux/percpu-defs.h:496:33: note: in expansion of macro '__pcpu_size_call' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^~~~~~~~~~~~ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^~~~~~~~~~~~ >> include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^~~~~~~~~~~~~~~~~ >> include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^~~~~~~ >> net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^~~~~~~~~~~~~~~~ >> include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ arch/x86/include/asm/percpu.h:137:17: note: in definition of macro 'percpu_add_op' switch (sizeof(var)) { \ ^~~ include/linux/percpu-defs.h:364:11: note: in expansion of macro 'this_cpu_add_1' case 1: stem##1(variable, __VA_ARGS__);break; \ ^~~~ include/linux/percpu-defs.h:496:33: note: in expansion of macro '__pcpu_size_call' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^~~~~~~~~~~~ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^~~~~~~~~~~~ >> include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^~~~~~~~~~~~~~~~~ vim +163 include/net/ipv6.h 8e7999c4 Pavel Emelyanov 2007-10-15 157 13415e46 Eric Dumazet 2016-04-27 158 #define _DEVUPD(net, statname, mod, idev, field, val) \ edf391ff Neil Horman 2009-04-27 159 ({ \ edf391ff Neil Horman 2009-04-27 160 struct inet6_dev *_idev = (idev); \ edf391ff Neil Horman 2009-04-27 161 if (likely(_idev != NULL)) \ 13415e46 Eric Dumazet 2016-04-27 162 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 13415e46 Eric Dumazet 2016-04-27 @163 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ edf391ff Neil Horman 2009-04-27 164 }) edf391ff Neil Horman 2009-04-27 165 14878f75 David L Stevens 2007-09-16 166 /* MIBs */ 14878f75 David L Stevens 2007-09-16 167 087fe240 Denis V. Lunev 2008-10-08 168 #define IP6_INC_STATS(net, idev,field) \ 13415e46 Eric Dumazet 2016-04-27 169 _DEVINC(net, ipv6, , idev, field) 1d015503 Eric Dumazet 2016-04-27 170 #define __IP6_INC_STATS(net, idev,field) \ 13415e46 Eric Dumazet 2016-04-27 171 _DEVINC(net, ipv6, __, idev, field) edf391ff Neil Horman 2009-04-27 172 #define IP6_ADD_STATS(net, idev,field,val) \ 13415e46 Eric Dumazet 2016-04-27 173 _DEVADD(net, ipv6, , idev, field, val) 1d015503 Eric Dumazet 2016-04-27 174 #define __IP6_ADD_STATS(net, idev,field,val) \ 13415e46 Eric Dumazet 2016-04-27 175 _DEVADD(net, ipv6, __, idev, field, val) edf391ff Neil Horman 2009-04-27 176 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 13415e46 Eric Dumazet 2016-04-27 @177 _DEVUPD(net, ipv6, , idev, field, val) c2005eb0 Eric Dumazet 2016-04-27 178 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 13415e46 Eric Dumazet 2016-04-27 179 _DEVUPD(net, ipv6, __, idev, field, val) 087fe240 Denis V. Lunev 2008-10-08 180 #define ICMP6_INC_STATS(net, idev, field) \ :::::: The code at line 163 was first introduced by commit :::::: 13415e46c5915e2dac089de516369005fbc045f9 net: snmp: kill STATS_BH macros :::::: TO: Eric Dumazet <edumazet@google.com> :::::: CC: David S. Miller <davem@davemloft.net> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Robert, [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Robert-Shearman/net-AF-specific-RTM_GETSTATS-attributes/20170114-095819 config: i386-randconfig-sb0-01141243 (attached as .config) compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): In file included from include/net/netns/mib.h:4:0, from include/net/net_namespace.h:14, from include/linux/netdevice.h:43, from include/uapi/linux/if_arp.h:26, from include/linux/if_arp.h:27, from net/mpls/af_mpls.c:7: net/mpls/af_mpls.c: In function 'mpls_stats_inc_outucastpkts': >> include/net/ipv6.h:163:35: error: 'struct netns_mib' has no member named 'ipv6_statistics' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/snmp.h:145:15: note: in definition of macro 'SNMP_UPD_PO_STATS' __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ ^ include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^ net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^ >> include/net/ipv6.h:163:35: error: 'struct netns_mib' has no member named 'ipv6_statistics' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/snmp.h:145:37: note: in definition of macro 'SNMP_UPD_PO_STATS' __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ ^ include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^ net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^ In file included from include/asm-generic/percpu.h:6:0, from arch/x86/include/asm/percpu.h:542, from arch/x86/include/asm/preempt.h:5, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mm_types.h:8, from include/linux/kmemcheck.h:4, from include/linux/skbuff.h:18, from net/mpls/af_mpls.c:2: include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/linux/percpu-defs.h:206:47: note: in definition of macro '__verify_pcpu_ptr' const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \ ^ include/linux/percpu-defs.h:496:33: note: in expansion of macro '__pcpu_size_call' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^ net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^ include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/linux/percpu-defs.h:363:16: note: in definition of macro '__pcpu_size_call' switch(sizeof(variable)) { \ ^ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^ net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^ In file included from arch/x86/include/asm/preempt.h:5:0, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mm_types.h:8, from include/linux/kmemcheck.h:4, from include/linux/skbuff.h:18, from net/mpls/af_mpls.c:2: include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector this_cpu_inc(ptr[basefield##PKTS]); \ ^ arch/x86/include/asm/percpu.h:128:17: note: in definition of macro 'percpu_add_op' typedef typeof(var) pao_T__; \ ^ include/linux/percpu-defs.h:364:11: note: in expansion of macro 'this_cpu_add_1' case 1: stem##1(variable, __VA_ARGS__);break; \ ^ include/linux/percpu-defs.h:496:33: note: in expansion of macro '__pcpu_size_call' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^ include/linux/percpu-defs.h:507:28: note: in expansion of macro 'this_cpu_add' #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) ^ include/net/snmp.h:146:3: note: in expansion of macro 'this_cpu_inc' this_cpu_inc(ptr[basefield##PKTS]); \ ^ include/net/ipv6.h:163:7: note: in expansion of macro 'SNMP_UPD_PO_STATS' mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ ^ include/net/ipv6.h:177:3: note: in expansion of macro '_DEVUPD' _DEVUPD(net, ipv6, , idev, field, val) ^ net/mpls/af_mpls.c:114:4: note: in expansion of macro 'IP6_UPD_PO_STATS' IP6_UPD_PO_STATS(dev_net(dev), in6dev, ^ include/net/snmp.h:146:19: error: subscripted value is neither array nor pointer nor vector vim +163 include/net/ipv6.h 8e7999c4 Pavel Emelyanov 2007-10-15 157 13415e46 Eric Dumazet 2016-04-27 158 #define _DEVUPD(net, statname, mod, idev, field, val) \ edf391ff Neil Horman 2009-04-27 159 ({ \ edf391ff Neil Horman 2009-04-27 160 struct inet6_dev *_idev = (idev); \ edf391ff Neil Horman 2009-04-27 161 if (likely(_idev != NULL)) \ 13415e46 Eric Dumazet 2016-04-27 162 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 13415e46 Eric Dumazet 2016-04-27 @163 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ edf391ff Neil Horman 2009-04-27 164 }) edf391ff Neil Horman 2009-04-27 165 14878f75 David L Stevens 2007-09-16 166 /* MIBs */ :::::: The code at line 163 was first introduced by commit :::::: 13415e46c5915e2dac089de516369005fbc045f9 net: snmp: kill STATS_BH macros :::::: TO: Eric Dumazet <edumazet@google.com> :::::: CC: David S. Miller <davem@davemloft.net> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
On 14/01/17 06:41, kbuild test robot wrote: > Hi Robert, > > [auto build test ERROR on net-next/master] > > url: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_0day-2Dci_linux_commits_Robert-2DShearman_net-2DAF-2Dspecific-2DRTM-5FGETSTATS-2Dattributes_20170114-2D095819&d=DwIBAg&c=IL_XqQWOjubgfqINi2jTzg&r=HbzsGgI7IidV3zRVGbZOYKAd0w1ch0IRBV2pqme4k9w&m=-FIZAjvyj_cLBHBTW14fNKp5IiJpkr1laQrxgxKnZ3g&s=_d4vequnI_QXJkUb0X3X8AUHdi6qD4R86g-mTBsEJ7g&e= > config: x86_64-randconfig-u0-01141334 (attached as .config) > compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 > reproduce: > # save the attached .config to linux build tree > make ARCH=x86_64 > > All error/warnings (new ones prefixed by >>): > > In file included from include/net/netns/mib.h:4:0, > from include/net/net_namespace.h:14, > from include/linux/netdevice.h:43, > from include/uapi/linux/if_arp.h:26, > from include/linux/if_arp.h:27, > from net/mpls/af_mpls.c:7: > net/mpls/af_mpls.c: In function 'mpls_stats_inc_outucastpkts': >>> include/net/ipv6.h:163:35: error: 'struct netns_mib' has no member named 'ipv6_statistics'; did you mean 'ip_statistics'? > mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ Good catch kbuild test robot. Expect to see a v2 shortly with this CONFIG_IPV6=n build failure fixed. Thanks, Rob
diff --git a/include/uapi/linux/mpls.h b/include/uapi/linux/mpls.h index 24a6cb1aec86..77a19dfe3990 100644 --- a/include/uapi/linux/mpls.h +++ b/include/uapi/linux/mpls.h @@ -43,4 +43,34 @@ struct mpls_label { #define MPLS_LABEL_FIRST_UNRESERVED 16 /* RFC3032 */ +/* These are embedded into IFLA_STATS_AF_SPEC: + * [IFLA_STATS_AF_SPEC] + * -> [AF_MPLS] + * -> [MPLS_STATS_xxx] + * + * Attributes: + * [MPLS_STATS_LINK] = { + * struct mpls_link_stats + * } + */ +enum { + MPLS_STATS_UNSPEC, /* also used as 64bit pad attribute */ + MPLS_STATS_LINK, + __MPLS_STATS_MAX, +}; + +#define MPLS_STATS_MAX (__MPLS_STATS_MAX - 1) + +struct mpls_link_stats { + __u64 rx_packets; /* total packets received */ + __u64 tx_packets; /* total packets transmitted */ + __u64 rx_bytes; /* total bytes received */ + __u64 tx_bytes; /* total bytes transmitted */ + __u64 rx_errors; /* bad packets received */ + __u64 tx_errors; /* packet transmit problems */ + __u64 rx_dropped; /* packet dropped on receive */ + __u64 tx_dropped; /* packet dropped on transmit */ + __u64 rx_noroute; /* no route for packet dest */ +}; + #endif /* _UAPI_MPLS_H */ diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 15fe97644ffe..fb20941cdda2 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -8,6 +8,7 @@ #include <linux/ipv6.h> #include <linux/mpls.h> #include <linux/vmalloc.h> +#include <linux/percpu.h> #include <net/ip.h> #include <net/dst.h> #include <net/sock.h> @@ -17,8 +18,8 @@ #include <net/netns/generic.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> -#include <net/addrconf.h> #endif +#include <net/addrconf.h> #include <net/nexthop.h> #include "internal.h" @@ -48,11 +49,6 @@ static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) return rt; } -static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) -{ - return rcu_dereference_rtnl(dev->mpls_ptr); -} - bool mpls_output_possible(const struct net_device *dev) { return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); @@ -98,6 +94,29 @@ bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) } EXPORT_SYMBOL_GPL(mpls_pkt_too_big); +void mpls_stats_inc_outucastpkts(struct net_device *dev, + const struct sk_buff *skb) +{ + struct mpls_dev *mdev; + struct inet6_dev *in6dev; + + if (skb->protocol == htons(ETH_P_MPLS_UC)) { + mdev = mpls_dev_get(dev); + if (mdev) + MPLS_INC_STATS_LEN(mdev, skb->len, + tx_packets, + tx_bytes); + } else if (skb->protocol == htons(ETH_P_IP)) { + IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); + } else if (skb->protocol == htons(ETH_P_IPV6)) { + in6dev = __in6_dev_get(dev); + if (in6dev) + IP6_UPD_PO_STATS(dev_net(dev), in6dev, + IPSTATS_MIB_OUT, skb->len); + } +} +EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); + static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb, bool bos) { @@ -253,6 +272,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, struct mpls_nh *nh; struct mpls_entry_decoded dec; struct net_device *out_dev; + struct mpls_dev *out_mdev; struct mpls_dev *mdev; unsigned int hh_len; unsigned int new_header_size; @@ -262,17 +282,25 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, /* Careful this entire function runs inside of an rcu critical section */ mdev = mpls_dev_get(dev); - if (!mdev || !mdev->input_enabled) + if (!mdev) goto drop; - if (skb->pkt_type != PACKET_HOST) + MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, + rx_bytes); + + if (!mdev->input_enabled) { + MPLS_INC_STATS(mdev, rx_dropped); goto drop; + } + + if (skb->pkt_type != PACKET_HOST) + goto err; if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) - goto drop; + goto err; if (!pskb_may_pull(skb, sizeof(*hdr))) - goto drop; + goto err; /* Read and decode the label */ hdr = mpls_hdr(skb); @@ -285,33 +313,35 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, skb_orphan(skb); rt = mpls_route_input_rcu(net, dec.label); - if (!rt) + if (!rt) { + MPLS_INC_STATS(mdev, rx_noroute); goto drop; + } nh = mpls_select_multipath(rt, skb, dec.bos); if (!nh) - goto drop; - - /* Find the output device */ - out_dev = rcu_dereference(nh->nh_dev); - if (!mpls_output_possible(out_dev)) - goto drop; + goto err; if (skb_warn_if_lro(skb)) - goto drop; + goto err; skb_forward_csum(skb); /* Verify ttl is valid */ if (dec.ttl <= 1) - goto drop; + goto err; dec.ttl -= 1; + /* Find the output device */ + out_dev = rcu_dereference(nh->nh_dev); + if (!mpls_output_possible(out_dev)) + goto tx_err; + /* Verify the destination can hold the packet */ new_header_size = mpls_nh_header_size(nh); mtu = mpls_dev_mtu(out_dev); if (mpls_pkt_too_big(skb, mtu - new_header_size)) - goto drop; + goto tx_err; hh_len = LL_RESERVED_SPACE(out_dev); if (!out_dev->header_ops) @@ -319,7 +349,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, /* Ensure there is enough space for the headers in the skb */ if (skb_cow(skb, hh_len + new_header_size)) - goto drop; + goto tx_err; skb->dev = out_dev; skb->protocol = htons(ETH_P_MPLS_UC); @@ -327,7 +357,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, if (unlikely(!new_header_size && dec.bos)) { /* Penultimate hop popping */ if (!mpls_egress(rt, skb, dec)) - goto drop; + goto err; } else { bool bos; int i; @@ -343,6 +373,8 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, } } + mpls_stats_inc_outucastpkts(out_dev, skb); + /* If via wasn't specified then send out using device address */ if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, @@ -355,6 +387,13 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, __func__, err); return 0; +tx_err: + out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; + if (out_mdev) + MPLS_INC_STATS(out_mdev, tx_errors); + goto drop; +err: + MPLS_INC_STATS(mdev, rx_errors); drop: kfree_skb(skb); return NET_RX_DROP; @@ -853,6 +892,70 @@ static int mpls_route_del(struct mpls_route_config *cfg) return err; } +static void mpls_get_stats(struct mpls_dev *mdev, + struct mpls_link_stats *stats) +{ + struct mpls_pcpu_stats *p; + int i; + + memset(stats, 0, sizeof(*stats)); + + for_each_possible_cpu(i) { + struct mpls_link_stats local; + unsigned int start; + + p = per_cpu_ptr(mdev->stats, i); + do { + start = u64_stats_fetch_begin(&p->syncp); + local = p->stats; + } while (u64_stats_fetch_retry(&p->syncp, start)); + + stats->rx_packets += local.rx_packets; + stats->rx_bytes += local.rx_bytes; + stats->tx_packets += local.tx_packets; + stats->tx_bytes += local.tx_bytes; + stats->rx_errors += local.rx_errors; + stats->tx_errors += local.tx_errors; + stats->rx_dropped += local.rx_dropped; + stats->tx_dropped += local.tx_dropped; + stats->rx_noroute += local.rx_noroute; + } +} + +static int mpls_fill_stats_af(struct sk_buff *skb, + const struct net_device *dev) +{ + struct mpls_link_stats *stats; + struct mpls_dev *mdev; + struct nlattr *nla; + + mdev = mpls_dev_get(dev); + if (!mdev) + return -ENODATA; + + nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, + sizeof(struct mpls_link_stats), + MPLS_STATS_UNSPEC); + if (!nla) + return -EMSGSIZE; + + stats = nla_data(nla); + mpls_get_stats(mdev, stats); + + return 0; +} + +static size_t mpls_get_stats_af_size(const struct net_device *dev) +{ + struct mpls_dev *mdev; + + mdev = mpls_dev_get(dev); + if (!mdev) + return 0; + + return nla_total_size_64bit(sizeof(struct mpls_link_stats)); +} + #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ (&((struct mpls_dev *)0)->field) @@ -911,6 +1014,7 @@ static struct mpls_dev *mpls_add_dev(struct net_device *dev) { struct mpls_dev *mdev; int err = -ENOMEM; + int i; ASSERT_RTNL(); @@ -918,6 +1022,17 @@ static struct mpls_dev *mpls_add_dev(struct net_device *dev) if (!mdev) return ERR_PTR(err); + mdev->stats = alloc_percpu(struct mpls_pcpu_stats); + if (!mdev->stats) + goto free; + + for_each_possible_cpu(i) { + struct mpls_pcpu_stats *mpls_stats; + + mpls_stats = per_cpu_ptr(mdev->stats, i); + u64_stats_init(&mpls_stats->syncp); + } + err = mpls_dev_sysctl_register(dev, mdev); if (err) goto free; @@ -927,10 +1042,19 @@ static struct mpls_dev *mpls_add_dev(struct net_device *dev) return mdev; free: + free_percpu(mdev->stats); kfree(mdev); return ERR_PTR(err); } +static void mpls_dev_destroy_rcu(struct rcu_head *head) +{ + struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); + + free_percpu(mdev->stats); + kfree(mdev); +} + static void mpls_ifdown(struct net_device *dev, int event) { struct mpls_route __rcu **platform_label; @@ -1045,7 +1169,7 @@ static int mpls_dev_notify(struct notifier_block *this, unsigned long event, if (mdev) { mpls_dev_sysctl_unregister(mdev); RCU_INIT_POINTER(dev->mpls_ptr, NULL); - kfree_rcu(mdev, rcu); + call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); } break; case NETDEV_CHANGENAME: @@ -1706,6 +1830,12 @@ static struct pernet_operations mpls_net_ops = { .exit = mpls_net_exit, }; +static struct rtnl_af_ops mpls_af_ops __read_mostly = { + .family = AF_MPLS, + .fill_stats_af = mpls_fill_stats_af, + .get_stats_af_size = mpls_get_stats_af_size, +}; + static int __init mpls_init(void) { int err; @@ -1722,6 +1852,8 @@ static int __init mpls_init(void) dev_add_pack(&mpls_packet_type); + rtnl_af_register(&mpls_af_ops); + rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); @@ -1738,6 +1870,7 @@ module_init(mpls_init); static void __exit mpls_exit(void) { rtnl_unregister_all(PF_MPLS); + rtnl_af_unregister(&mpls_af_ops); dev_remove_pack(&mpls_packet_type); unregister_netdevice_notifier(&mpls_dev_notifier); unregister_pernet_subsys(&mpls_net_ops); diff --git a/net/mpls/internal.h b/net/mpls/internal.h index bdfef6c3271a..d97243034605 100644 --- a/net/mpls/internal.h +++ b/net/mpls/internal.h @@ -9,13 +9,58 @@ struct mpls_entry_decoded { u8 bos; }; +struct mpls_pcpu_stats { + struct mpls_link_stats stats; + struct u64_stats_sync syncp; +}; + struct mpls_dev { - int input_enabled; + int input_enabled; - struct ctl_table_header *sysctl; - struct rcu_head rcu; + struct mpls_pcpu_stats __percpu *stats; + + struct ctl_table_header *sysctl; + struct rcu_head rcu; }; +#if BITS_PER_LONG == 32 + +#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \ + do { \ + __typeof__(*(mdev)->stats) *ptr = \ + raw_cpu_ptr((mdev)->stats); \ + local_bh_disable(); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->stats.pkts_field++; \ + ptr->stats.bytes_field += (len); \ + u64_stats_update_end(&ptr->syncp); \ + local_bh_enable(); \ + } while (0) + +#define MPLS_INC_STATS(mdev, field) \ + do { \ + __typeof__(*(mdev)->stats) *ptr = \ + raw_cpu_ptr((mdev)->stats); \ + local_bh_disable(); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->stats.field++; \ + u64_stats_update_end(&ptr->syncp); \ + local_bh_enable(); \ + } while (0) + +#else + +#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \ + do { \ + this_cpu_inc((mdev)->stats->stats.pkts_field); \ + this_cpu_add((mdev)->stats->stats.bytes_field, (len)); \ + } while (0) + +#define MPLS_INC_STATS(mdev, field) \ + this_cpu_inc((mdev)->stats->stats.field) + +#endif + struct sk_buff; #define LABEL_NOT_SPECIFIED (1 << 20) @@ -114,6 +159,11 @@ static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr * return result; } +static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) +{ + return rcu_dereference_rtnl(dev->mpls_ptr); +} + int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]); int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels, @@ -123,5 +173,7 @@ int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, bool mpls_output_possible(const struct net_device *dev); unsigned int mpls_dev_mtu(const struct net_device *dev); bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu); +void mpls_stats_inc_outucastpkts(struct net_device *dev, + const struct sk_buff *skb); #endif /* MPLS_INTERNAL_H */ diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c index 2f7ccd934416..02531284bc49 100644 --- a/net/mpls/mpls_iptunnel.c +++ b/net/mpls/mpls_iptunnel.c @@ -48,11 +48,15 @@ static int mpls_xmit(struct sk_buff *skb) struct dst_entry *dst = skb_dst(skb); struct rtable *rt = NULL; struct rt6_info *rt6 = NULL; + struct mpls_dev *out_mdev; int err = 0; bool bos; int i; unsigned int ttl; + /* Find the output device */ + out_dev = dst->dev; + /* Obtain the ttl */ if (dst->ops->family == AF_INET) { ttl = ip_hdr(skb)->ttl; @@ -66,8 +70,6 @@ static int mpls_xmit(struct sk_buff *skb) skb_orphan(skb); - /* Find the output device */ - out_dev = dst->dev; if (!mpls_output_possible(out_dev) || !dst->lwtstate || skb_warn_if_lro(skb)) goto drop; @@ -109,6 +111,8 @@ static int mpls_xmit(struct sk_buff *skb) bos = false; } + mpls_stats_inc_outucastpkts(out_dev, skb); + if (rt) err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gateway, skb); @@ -122,6 +126,9 @@ static int mpls_xmit(struct sk_buff *skb) return LWTUNNEL_XMIT_DONE; drop: + out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; + if (out_mdev) + MPLS_INC_STATS(out_mdev, tx_errors); kfree_skb(skb); return -EINVAL; }
Having MPLS packet stats is useful for observing network operation and for diagnosing network problems. In the absence of anything better, RFC2863 and RFC3813 are used for guidance for which stats to expose and the semantics of them. In particular rx_noroutes maps to in unknown protos in RFC2863. The stats are exposed to userspace via AF_MPLS attributes embedded in the IFLA_STATS_AF_SPEC attribute of RTM_GETSTATS messages. All the introduced fields are 64-bit, even error ones, to ensure no overflow with long uptimes. Per-CPU counters are used to avoid cache-line contention on the commonly used fields. The other fields have also been made per-CPU for code to avoid performance problems in error conditions on the assumption that on some platforms the cost of atomic operations could be more expensive than sending the packet (which is what would be done in the success case). If that's not the case, we could instead not use per-CPU counters for these fields. Only unicast and non-fragment are exposed at the moment, but other counters can be exposed in the future either by adding to the end of struct mpls_link_stats or by additional netlink attributes in the AF_MPLS IFLA_STATS_AF_SPEC nested attribute. Signed-off-by: Robert Shearman <rshearma@brocade.com> --- include/uapi/linux/mpls.h | 30 ++++++++ net/mpls/af_mpls.c | 179 ++++++++++++++++++++++++++++++++++++++++------ net/mpls/internal.h | 58 ++++++++++++++- net/mpls/mpls_iptunnel.c | 11 ++- 4 files changed, 250 insertions(+), 28 deletions(-)