diff options
| author | Maryam Tahhan <mtahhan@redhat.com> | 2022-11-15 09:49:21 -0500 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-11-18 23:16:31 +0100 |
| commit | d1e91173cd29ba13c5953d1820a7543140feec93 (patch) | |
| tree | cc7551892865dd8ee07e5fac04710e6cc2c2da90 /net/core | |
| parent | f80e16b614f303b520465b7c704ff89fab800f2f (diff) | |
| download | linux-d1e91173cd29ba13c5953d1820a7543140feec93.tar.bz2 | |
bpf, docs: DEVMAPs and XDP_REDIRECT
Add documentation for BPF_MAP_TYPE_DEVMAP and BPF_MAP_TYPE_DEVMAP_HASH
including kernel version introduced, usage and examples.
Add documentation that describes XDP_REDIRECT.
Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221115144921.165483-1-mtahhan@redhat.com
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 754dd01354d8..2a105fb1ceb2 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4108,7 +4108,10 @@ static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { .arg2_type = ARG_ANYTHING, }; -/* XDP_REDIRECT works by a three-step process, implemented in the functions +/** + * DOC: xdp redirect + * + * XDP_REDIRECT works by a three-step process, implemented in the functions * below: * * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target @@ -4123,7 +4126,8 @@ static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { * 3. Before exiting its NAPI poll loop, the driver will call xdp_do_flush(), * which will flush all the different bulk queues, thus completing the * redirect. - * + */ +/* * Pointers to the map entries will be kept around for this whole sequence of * steps, protected by RCU. However, there is no top-level rcu_read_lock() in * the core code; instead, the RCU protection relies on everything happening |