/* Copyright (c) 2016 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include #include #include #include #include "bpf_helpers.h" #define MAX_ENTRIES 1000 struct bpf_map_def SEC("maps") hash_map = { .type = BPF_MAP_TYPE_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = MAX_ENTRIES, }; struct bpf_map_def SEC("maps") lru_hash_map = { .type = BPF_MAP_TYPE_LRU_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = 10000, }; struct bpf_map_def SEC("maps") percpu_lru_hash_map = { .type = BPF_MAP_TYPE_LRU_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = 10000, .map_flags = BPF_F_NO_COMMON_LRU, }; struct bpf_map_def SEC("maps") percpu_hash_map = { .type = BPF_MAP_TYPE_PERCPU_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = MAX_ENTRIES, }; struct bpf_map_def SEC("maps") hash_map_alloc = { .type = BPF_MAP_TYPE_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = MAX_ENTRIES, .map_flags = BPF_F_NO_PREALLOC, }; struct bpf_map_def SEC("maps") percpu_hash_map_alloc = { .type = BPF_MAP_TYPE_PERCPU_HASH, .key_size = sizeof(u32), .value_size = sizeof(long), .max_entries = MAX_ENTRIES, .map_flags = BPF_F_NO_PREALLOC, }; struct bpf_map_def SEC("maps") lpm_trie_map_alloc = { .type = BPF_MAP_TYPE_LPM_TRIE, .key_size = 8, .value_size = sizeof(long), .max_entries = 10000, .map_flags = BPF_F_NO_PREALLOC, }; SEC("kprobe/sys_getuid") int stress_hmap(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); long init_val = 1; long *value; bpf_map_update_elem(&hash_map, &key, &init_val, BPF_ANY); value = bpf_map_lookup_elem(&hash_map, &key); if (value) bpf_map_delete_elem(&hash_map, &key); return 0; } SEC("kprobe/sys_geteuid") int stress_percpu_hmap(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); long init_val = 1; long *value; bpf_map_update_elem(&percpu_hash_map, &key, &init_val, BPF_ANY); value = bpf_map_lookup_elem(&percpu_hash_map, &key); if (value) bpf_map_delete_elem(&percpu_hash_map, &key); return 0; } SEC("kprobe/sys_getgid") int stress_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); long init_val = 1; long *value; bpf_map_update_elem(&hash_map_alloc, &key, &init_val, BPF_ANY); value = bpf_map_lookup_elem(&hash_map_alloc, &key); if (value) bpf_map_delete_elem(&hash_map_alloc, &key); return 0; } SEC("kprobe/sys_getegid") int stress_percpu_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); long init_val = 1; long *value; bpf_map_update_elem(&percpu_hash_map_alloc, &key, &init_val, BPF_ANY); value = bpf_map_lookup_elem(&percpu_hash_map_alloc, &key); if (value) bpf_map_delete_elem(&percpu_hash_map_alloc, &key); return 0; } SEC("kprobe/sys_getpid") int stress_lru_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_prandom_u32(); long val = 1; bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY); return 0; } SEC("kprobe/sys_getppid") int stress_percpu_lru_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_prandom_u32(); long val = 1; bpf_map_update_elem(&percpu_lru_hash_map, &key, &val, BPF_ANY); return 0; } SEC("kprobe/sys_gettid") int stress_lpm_trie_map_alloc(struct pt_regs *ctx) { union { u32 b32[2]; u8 b8[8]; } key; unsigned int i; key.b32[0] = 32; key.b8[4] = 192; key.b8[5] = 168; key.b8[6] = 0; key.b8[7] = 1; #pragma clang loop unroll(full) for (i = 0; i < 32; ++i) bpf_map_lookup_elem(&lpm_trie_map_alloc, &key); return 0; } char _license[] SEC("license") = "GPL"; u32 _version SEC("version") = LINUX_VERSION_CODE; d'>3space:mode:
authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/wireless/mesh.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/wireless/mesh.c')