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authorXie He <xie.he.0141@gmail.com>2021-02-05 14:41:24 -0800
committerJakub Kicinski <kuba@kernel.org>2021-02-06 14:59:28 -0800
commit21c85974aab7211619d39364990427af543c88ac (patch)
tree849d996f56e276eac84aa7ae790313ce97027650 /net/packet
parent163a180213afb2d0ec16cd71d0e0669cb940cd08 (diff)
downloadlinux-21c85974aab7211619d39364990427af543c88ac.tar.bz2
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')
-rw-r--r--net/packet/af_packet.c4
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