diff options
author | Björn Töpel <bjorn.topel@intel.com> | 2020-05-20 22:20:50 +0300 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2020-05-22 03:31:26 +0300 |
commit | d20a1676df7e4c3c23d73299159811a50e4854bc (patch) | |
tree | 5492329a8b772bb2e1291b680ebb5e544107364e /kernel/bpf | |
parent | 44ac082b30dc2a05a7e23ed7e17b5f9513873386 (diff) |
xsk: Move xskmap.c to net/xdp/
The XSKMAP is partly implemented by net/xdp/xsk.c. Move xskmap.c from
kernel/bpf/ to net/xdp/, which is the logical place for AF_XDP related
code. Also, move AF_XDP struct definitions, and function declarations
only used by AF_XDP internals into net/xdp/xsk.h.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200520192103.355233-3-bjorn.topel@gmail.com
Diffstat (limited to 'kernel/bpf')
-rw-r--r-- | kernel/bpf/Makefile | 3 | ||||
-rw-r--r-- | kernel/bpf/xskmap.c | 265 |
2 files changed, 0 insertions, 268 deletions
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile index 37b2d8620153..375b933010dd 100644 --- a/kernel/bpf/Makefile +++ b/kernel/bpf/Makefile @@ -12,9 +12,6 @@ obj-$(CONFIG_BPF_JIT) += dispatcher.o ifeq ($(CONFIG_NET),y) obj-$(CONFIG_BPF_SYSCALL) += devmap.o obj-$(CONFIG_BPF_SYSCALL) += cpumap.o -ifeq ($(CONFIG_XDP_SOCKETS),y) -obj-$(CONFIG_BPF_SYSCALL) += xskmap.o -endif obj-$(CONFIG_BPF_SYSCALL) += offload.o endif ifeq ($(CONFIG_PERF_EVENTS),y) diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c deleted file mode 100644 index 2cc5c8f4c800..000000000000 --- a/kernel/bpf/xskmap.c +++ /dev/null @@ -1,265 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* XSKMAP used for AF_XDP sockets - * Copyright(c) 2018 Intel Corporation. - */ - -#include <linux/bpf.h> -#include <linux/capability.h> -#include <net/xdp_sock.h> -#include <linux/slab.h> -#include <linux/sched.h> - -int xsk_map_inc(struct xsk_map *map) -{ - bpf_map_inc(&map->map); - return 0; -} - -void xsk_map_put(struct xsk_map *map) -{ - bpf_map_put(&map->map); -} - -static struct xsk_map_node *xsk_map_node_alloc(struct xsk_map *map, - struct xdp_sock **map_entry) -{ - struct xsk_map_node *node; - int err; - - node = kzalloc(sizeof(*node), GFP_ATOMIC | __GFP_NOWARN); - if (!node) - return ERR_PTR(-ENOMEM); - - err = xsk_map_inc(map); - if (err) { - kfree(node); - return ERR_PTR(err); - } - - node->map = map; - node->map_entry = map_entry; - return node; -} - -static void xsk_map_node_free(struct xsk_map_node *node) -{ - xsk_map_put(node->map); - kfree(node); -} - -static void xsk_map_sock_add(struct xdp_sock *xs, struct xsk_map_node *node) -{ - spin_lock_bh(&xs->map_list_lock); - list_add_tail(&node->node, &xs->map_list); - spin_unlock_bh(&xs->map_list_lock); -} - -static void xsk_map_sock_delete(struct xdp_sock *xs, - struct xdp_sock **map_entry) -{ - struct xsk_map_node *n, *tmp; - - spin_lock_bh(&xs->map_list_lock); - list_for_each_entry_safe(n, tmp, &xs->map_list, node) { - if (map_entry == n->map_entry) { - list_del(&n->node); - xsk_map_node_free(n); - } - } - spin_unlock_bh(&xs->map_list_lock); -} - -static struct bpf_map *xsk_map_alloc(union bpf_attr *attr) -{ - struct bpf_map_memory mem; - int err, numa_node; - struct xsk_map *m; - u64 size; - - if (!capable(CAP_NET_ADMIN)) - return ERR_PTR(-EPERM); - - if (attr->max_entries == 0 || attr->key_size != 4 || - attr->value_size != 4 || - attr->map_flags & ~(BPF_F_NUMA_NODE | BPF_F_RDONLY | BPF_F_WRONLY)) - return ERR_PTR(-EINVAL); - - numa_node = bpf_map_attr_numa_node(attr); - size = struct_size(m, xsk_map, attr->max_entries); - - err = bpf_map_charge_init(&mem, size); - if (err < 0) - return ERR_PTR(err); - - m = bpf_map_area_alloc(size, numa_node); - if (!m) { - bpf_map_charge_finish(&mem); - return ERR_PTR(-ENOMEM); - } - - bpf_map_init_from_attr(&m->map, attr); - bpf_map_charge_move(&m->map.memory, &mem); - spin_lock_init(&m->lock); - - return &m->map; -} - -static void xsk_map_free(struct bpf_map *map) -{ - struct xsk_map *m = container_of(map, struct xsk_map, map); - - bpf_clear_redirect_map(map); - synchronize_net(); - bpf_map_area_free(m); -} - -static int xsk_map_get_next_key(struct bpf_map *map, void *key, void *next_key) -{ - struct xsk_map *m = container_of(map, struct xsk_map, map); - u32 index = key ? *(u32 *)key : U32_MAX; - u32 *next = next_key; - - if (index >= m->map.max_entries) { - *next = 0; - return 0; - } - - if (index == m->map.max_entries - 1) - return -ENOENT; - *next = index + 1; - return 0; -} - -static u32 xsk_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf) -{ - const int ret = BPF_REG_0, mp = BPF_REG_1, index = BPF_REG_2; - struct bpf_insn *insn = insn_buf; - - *insn++ = BPF_LDX_MEM(BPF_W, ret, index, 0); - *insn++ = BPF_JMP_IMM(BPF_JGE, ret, map->max_entries, 5); - *insn++ = BPF_ALU64_IMM(BPF_LSH, ret, ilog2(sizeof(struct xsk_sock *))); - *insn++ = BPF_ALU64_IMM(BPF_ADD, mp, offsetof(struct xsk_map, xsk_map)); - *insn++ = BPF_ALU64_REG(BPF_ADD, ret, mp); - *insn++ = BPF_LDX_MEM(BPF_SIZEOF(struct xsk_sock *), ret, ret, 0); - *insn++ = BPF_JMP_IMM(BPF_JA, 0, 0, 1); - *insn++ = BPF_MOV64_IMM(ret, 0); - return insn - insn_buf; -} - -static void *xsk_map_lookup_elem(struct bpf_map *map, void *key) -{ - WARN_ON_ONCE(!rcu_read_lock_held()); - return __xsk_map_lookup_elem(map, *(u32 *)key); -} - -static void *xsk_map_lookup_elem_sys_only(struct bpf_map *map, void *key) -{ - return ERR_PTR(-EOPNOTSUPP); -} - -static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value, - u64 map_flags) -{ - struct xsk_map *m = container_of(map, struct xsk_map, map); - struct xdp_sock *xs, *old_xs, **map_entry; - u32 i = *(u32 *)key, fd = *(u32 *)value; - struct xsk_map_node *node; - struct socket *sock; - int err; - - if (unlikely(map_flags > BPF_EXIST)) - return -EINVAL; - if (unlikely(i >= m->map.max_entries)) - return -E2BIG; - - sock = sockfd_lookup(fd, &err); - if (!sock) - return err; - - if (sock->sk->sk_family != PF_XDP) { - sockfd_put(sock); - return -EOPNOTSUPP; - } - - xs = (struct xdp_sock *)sock->sk; - - if (!xsk_is_setup_for_bpf_map(xs)) { - sockfd_put(sock); - return -EOPNOTSUPP; - } - - map_entry = &m->xsk_map[i]; - node = xsk_map_node_alloc(m, map_entry); - if (IS_ERR(node)) { - sockfd_put(sock); - return PTR_ERR(node); - } - - spin_lock_bh(&m->lock); - old_xs = READ_ONCE(*map_entry); - if (old_xs == xs) { - err = 0; - goto out; - } else if (old_xs && map_flags == BPF_NOEXIST) { - err = -EEXIST; - goto out; - } else if (!old_xs && map_flags == BPF_EXIST) { - err = -ENOENT; - goto out; - } - xsk_map_sock_add(xs, node); - WRITE_ONCE(*map_entry, xs); - if (old_xs) - xsk_map_sock_delete(old_xs, map_entry); - spin_unlock_bh(&m->lock); - sockfd_put(sock); - return 0; - -out: - spin_unlock_bh(&m->lock); - sockfd_put(sock); - xsk_map_node_free(node); - return err; -} - -static int xsk_map_delete_elem(struct bpf_map *map, void *key) -{ - struct xsk_map *m = container_of(map, struct xsk_map, map); - struct xdp_sock *old_xs, **map_entry; - int k = *(u32 *)key; - - if (k >= map->max_entries) - return -EINVAL; - - spin_lock_bh(&m->lock); - map_entry = &m->xsk_map[k]; - old_xs = xchg(map_entry, NULL); - if (old_xs) - xsk_map_sock_delete(old_xs, map_entry); - spin_unlock_bh(&m->lock); - - return 0; -} - -void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs, - struct xdp_sock **map_entry) -{ - spin_lock_bh(&map->lock); - if (READ_ONCE(*map_entry) == xs) { - WRITE_ONCE(*map_entry, NULL); - xsk_map_sock_delete(xs, map_entry); - } - spin_unlock_bh(&map->lock); -} - -const struct bpf_map_ops xsk_map_ops = { - .map_alloc = xsk_map_alloc, - .map_free = xsk_map_free, - .map_get_next_key = xsk_map_get_next_key, - .map_lookup_elem = xsk_map_lookup_elem, - .map_gen_lookup = xsk_map_gen_lookup, - .map_lookup_elem_sys_only = xsk_map_lookup_elem_sys_only, - .map_update_elem = xsk_map_update_elem, - .map_delete_elem = xsk_map_delete_elem, - .map_check_btf = map_check_no_btf, -}; |