[PATCH iproute2-next] bpf: don't offload perf array maps

[Jakub Kicinski]

Perf arrays are handled specially by the kernel, don't request
offload even when used by an offloaded program.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Quentin Monnet <quentin.mon...@netronome.com>
---
 lib/bpf.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/bpf.c b/lib/bpf.c
index d9a406bf55f2..4e26c0df76c5 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -97,6 +97,11 @@ static const struct bpf_prog_meta __bpf_prog_meta[] = {
        },
 };
 
+static bool bpf_map_offload_neutral(enum bpf_map_type type)
+{
+       return type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
+}
+
 static const char *bpf_prog_to_subdir(enum bpf_prog_type type)
 {
        assert(type < ARRAY_SIZE(__bpf_prog_meta) &&
@@ -1594,7 +1599,7 @@ static int bpf_map_attach(const char *name, struct 
bpf_elf_ctx *ctx,
                          const struct bpf_elf_map *map, struct bpf_map_ext 
*ext,
                          int *have_map_in_map)
 {
-       int fd, ret, map_inner_fd = 0;
+       int fd, ifindex, ret, map_inner_fd = 0;
 
        fd = bpf_probe_pinned(name, ctx, map->pinning);
        if (fd > 0) {
@@ -1631,10 +1636,10 @@ static int bpf_map_attach(const char *name, struct 
bpf_elf_ctx *ctx,
                }
        }
 
+       ifindex = bpf_map_offload_neutral(map->type) ? 0 : ctx->ifindex;
        errno = 0;
        fd = bpf_map_create(map->type, map->size_key, map->size_value,
-                           map->max_elem, map->flags, map_inner_fd,
-                           ctx->ifindex);
+                           map->max_elem, map->flags, map_inner_fd, ifindex);
 
        if (fd < 0 || ctx->verbose) {
                bpf_map_report(fd, name, map, ctx, map_inner_fd);
-- 
2.17.0