diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2023-10-16 14:57:38 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-10-17 15:02:03 +0200 |
| commit | 9a675ba55a96a45a9fb69e6a5c43f80c6682e541 (patch) | |
| tree | c7d9260fe55b9ee3be40aae411dcba0a91556e1f /kernel/bpf/cpumap.c | |
| parent | 137df1189d128a6b5dee2f653e054b40ef36b94c (diff) | |
net, bpf: Add a warning if NAPI cb missed xdp_do_flush().
A few drivers were missing a xdp_do_flush() invocation after
XDP_REDIRECT.
Add three helper functions each for one of the per-CPU lists. Return
true if the per-CPU list is non-empty and flush the list.
Add xdp_do_check_flushed() which invokes each helper functions and
creates a warning if one of the functions had a non-empty list.
Hide everything behind CONFIG_DEBUG_NET.
Suggested-by: Jesper Dangaard Brouer <hawk@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20231016125738.Yt79p1uF@linutronix.de
Diffstat (limited to 'kernel/bpf/cpumap.c')
| -rw-r--r-- | kernel/bpf/cpumap.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c index e42a1bdb7f53..8a0bb80fe48a 100644 --- a/kernel/bpf/cpumap.c +++ b/kernel/bpf/cpumap.c @@ -764,6 +764,16 @@ void __cpu_map_flush(void) } } +#ifdef CONFIG_DEBUG_NET +bool cpu_map_check_flush(void) +{ + if (list_empty(this_cpu_ptr(&cpu_map_flush_list))) + return false; + __cpu_map_flush(); + return true; +} +#endif + static int __init cpu_map_init(void) { int cpu; |