/* * * SNMP MIB entries for the IP subsystem. * * Alan Cox * * We don't chose to implement SNMP in the kernel (this would * be silly as SNMP is a pain in the backside in places). We do * however need to collect the MIB statistics and export them * out of /proc (eventually) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #ifndef _SNMP_H #define _SNMP_H #include #include #include /* * Mibs are stored in array of unsigned long. */ /* * struct snmp_mib{} * - list of entries for particular API (such as /proc/net/snmp) * - name of entries. */ struct snmp_mib { const char *name; int entry; }; #define SNMP_MIB_ITEM(_name,_entry) { \ .name = _name, \ .entry = _entry, \ } #define SNMP_MIB_SENTINEL { \ .name = NULL, \ .entry = 0, \ } /* * We use unsigned longs for most mibs but u64 for ipstats. */ #include /* IPstats */ #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX struct ipstats_mib { /* mibs[] must be first field of struct ipstats_mib */ u64 mibs[IPSTATS_MIB_MAX]; struct u64_stats_sync syncp; }; /* ICMP */ #define ICMP_MIB_MAX __ICMP_MIB_MAX struct icmp_mib { unsigned long mibs[ICMP_MIB_MAX]; }; #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX struct icmpmsg_mib { atomic_long_t mibs[ICMPMSG_MIB_MAX]; }; /* ICMP6 (IPv6-ICMP) */ #define ICMP6_MIB_MAX __ICMP6_MIB_MAX /* per network ns counters */ struct icmpv6_mib { unsigned long mibs[ICMP6_MIB_MAX]; }; /* per device counters, (shared on all cpus) */ struct icmpv6_mib_device { atomic_long_t mibs[ICMP6_MIB_MAX]; }; #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX /* per network ns counters */ struct icmpv6msg_mib { atomic_long_t mibs[ICMP6MSG_MIB_MAX]; }; /* per device counters, (shared on all cpus) */ struct icmpv6msg_mib_device { atomic_long_t mibs[ICMP6MSG_MIB_MAX]; }; /* TCP */ #define TCP_MIB_MAX __TCP_MIB_MAX struct tcp_mib { unsigned long mibs[TCP_MIB_MAX]; }; /* UDP */ #define UDP_MIB_MAX __UDP_MIB_MAX struct udp_mib { unsigned long mibs[UDP_MIB_MAX]; }; /* Linux */ #define LINUX_MIB_MAX __LINUX_MIB_MAX struct linux_mib { unsigned long mibs[LINUX_MIB_MAX]; }; /* Linux Xfrm */ #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX struct linux_xfrm_mib { unsigned long mibs[LINUX_MIB_XFRMMAX]; }; #define DEFINE_SNMP_STAT(type, name) \ __typeof__(type) __percpu *name #define DEFINE_SNMP_STAT_ATOMIC(type, name) \ __typeof__(type) *name #define DECLARE_SNMP_STAT(type, name) \ extern __typeof__(type) __percpu *name #define __SNMP_INC_STATS(mib, field) \ __this_cpu_inc(mib->mibs[field]) #define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \ atomic_long_inc(&mib->mibs[field]) #define SNMP_INC_STATS(mib, field) \ this_cpu_inc(mib->mibs[field]) #define SNMP_DEC_STATS(mib, field) \ this_cpu_dec(mib->mibs[field]) #define __SNMP_ADD_STATS(mib, field, addend) \ __this_cpu_add(mib->mibs[field], addend) #define SNMP_ADD_STATS(mib, field, addend) \ this_cpu_add(mib->mibs[field], addend) #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ do { \ __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ this_cpu_inc(ptr[basefield##PKTS]); \ this_cpu_add(ptr[basefield##OCTETS], addend); \ } while (0) #define __SNMP_UPD_PO_STATS(mib, basefield, addend) \ do { \ __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ __this_cpu_inc(ptr[basefield##PKTS]); \ __this_cpu_add(ptr[basefield##OCTETS], addend); \ } while (0) #if BITS_PER_LONG==32 #define __SNMP_ADD_STATS64(mib, field, addend) \ do { \ __typeof__(*mib) *ptr = raw_cpu_ptr(mib); \ u64_stats_update_begin(&ptr->syncp); \ ptr->mibs[field] += addend; \ u64_stats_update_end(&ptr->syncp); \ } while (0) #define SNMP_ADD_STATS64(mib, field, addend) \ do { \ local_bh_disable(); \ __SNMP_ADD_STATS64(mib, field, addend); \ local_bh_enable(); \ } while (0) #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \ do { \ __typeof__(*mib) *ptr; \ ptr = raw_cpu_ptr((mib)); \ u64_stats_update_begin(&ptr->syncp); \ ptr->mibs[basefield##PKTS]++; \ ptr->mibs[basefield##OCTETS] += addend; \ u64_stats_update_end(&ptr->syncp); \ } while (0) #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \ do { \ local_bh_disable(); \ __SNMP_UPD_PO_STATS64(mib, basefield, addend); \ local_bh_enable(); \ } while (0) #else #define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field) #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field) #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field) #define __SNMP_ADD_STATS64(mib, field, addend) __SNMP_ADD_STATS(mib, field, addend) #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend) #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend) #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend) #endif #endif ve&id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143 (patch) tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/irda/irias_object.c parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/irda/irias_object.c')