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| author |   Xie He <xie.he.0141@gmail.com> | 2021-02-05 14:41:24 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-02-06 14:59:28 -0800 |
| commit | 21c85974aab7211619d39364990427af543c88ac (patch) | |
| tree | 849d996f56e276eac84aa7ae790313ce97027650 /net/packet/af_packet.c | |
| parent | Merge branch 'net-ipa-a-mix-of-small-improvements' (diff) | |
| download | linux-dev-21c85974aab7211619d39364990427af543c88ac.tar.xz linux-dev-21c85974aab7211619d39364990427af543c88ac.zip | |
net/packet: Improve the comment about LL header visibility criteria
The "dev_has_header" function, recently added in
commit d549699048b4 ("net/packet: fix packet receive on L3 devices
without visible hard header"),
is more accurate as criteria for determining whether a device exposes
the LL header to upper layers, because in addition to dev->header_ops,
it also checks for dev->header_ops->create.
When transmitting an skb on a device, dev_hard_header can be called to
generate an LL header. dev_hard_header will only generate a header if
dev->header_ops->create is present.
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20210205224124.21345-1-xie.he.0141@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 6bbc7a448593..e24b2841c643 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -135,11 +135,11 @@ Resume On transmit: ------------ -dev->header_ops != NULL +dev_has_header(dev) == true mac_header -> ll header data -> ll header -dev->header_ops == NULL (ll header is invisible to us) +dev_has_header(dev) == false (ll header is invisible to us) mac_header -> data data -> data |