From fd91de7b3c69a7f108b92521e1115df3e058af55 Mon Sep 17 00:00:00 2001 From: Martin KaFai Lau Date: Fri, 11 Nov 2016 10:55:08 -0800 Subject: bpf: Refactor codes handling percpu map Refactor the codes that populate the value of a htab_elem in a BPF_MAP_TYPE_PERCPU_HASH typed bpf_map. Signed-off-by: Martin KaFai Lau Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- kernel/bpf/hashtab.c | 47 +++++++++++++++++++++-------------------------- 1 file changed, 21 insertions(+), 26 deletions(-) (limited to 'kernel') diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c index ad1bc67aff1b..b478d80f9771 100644 --- a/kernel/bpf/hashtab.c +++ b/kernel/bpf/hashtab.c @@ -420,6 +420,24 @@ static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l) } } +static void pcpu_copy_value(struct bpf_htab *htab, void __percpu *pptr, + void *value, bool onallcpus) +{ + if (!onallcpus) { + /* copy true value_size bytes */ + memcpy(this_cpu_ptr(pptr), value, htab->map.value_size); + } else { + u32 size = round_up(htab->map.value_size, 8); + int off = 0, cpu; + + for_each_possible_cpu(cpu) { + bpf_long_memcpy(per_cpu_ptr(pptr, cpu), + value + off, size); + off += size; + } + } +} + static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key, void *value, u32 key_size, u32 hash, bool percpu, bool onallcpus, @@ -479,18 +497,8 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key, } } - if (!onallcpus) { - /* copy true value_size bytes */ - memcpy(this_cpu_ptr(pptr), value, htab->map.value_size); - } else { - int off = 0, cpu; + pcpu_copy_value(htab, pptr, value, onallcpus); - for_each_possible_cpu(cpu) { - bpf_long_memcpy(per_cpu_ptr(pptr, cpu), - value + off, size); - off += size; - } - } if (!prealloc) htab_elem_set_ptr(l_new, key_size, pptr); } else { @@ -606,22 +614,9 @@ static int __htab_percpu_map_update_elem(struct bpf_map *map, void *key, goto err; if (l_old) { - void __percpu *pptr = htab_elem_get_ptr(l_old, key_size); - u32 size = htab->map.value_size; - /* per-cpu hash map can update value in-place */ - if (!onallcpus) { - memcpy(this_cpu_ptr(pptr), value, size); - } else { - int off = 0, cpu; - - size = round_up(size, 8); - for_each_possible_cpu(cpu) { - bpf_long_memcpy(per_cpu_ptr(pptr, cpu), - value + off, size); - off += size; - } - } + pcpu_copy_value(htab, htab_elem_get_ptr(l_old, key_size), + value, onallcpus); } else { l_new = alloc_htab_elem(htab, key, value, key_size, hash, true, onallcpus, false); -- cgit v1.2.3