From: Jim Baxter <jim_baxter@mentor•com>
To: <netdev@vger•kernel.org>
Subject: VLAN driver question
Date: Mon, 17 Jun 2013 20:12:01 +0100 [thread overview]
Message-ID: <51BF5F81.2040207@mentor.com> (raw)
I have a network card that has a single flag to indicate if a received
packet contains a vlan packet.
Can I use this to accelerate the kernels handling of the packet with
something like the following?
/* Handle received VLAN packets */
if ((ndev->features & NETIF_F_HW_VLAN_CTAG_RX) && ebdp &&
(ebdp->cbd_esc &
BD_ENET_RX_VLAN)) {
/* Push and remove the vlan tag */
struct vlan_hdr *vlan_header;
u16 vlan_tag;
vlan_header = (struct vlan_hdr *) skb->data;
vlan_tag = ntohs(vlan_header->h_vlan_TCI);
__vlan_hwaccel_put_tag(skb, vlan_tag);
skb->len -= VLAN_HLEN;
skb->data += VLAN_HLEN;
vlan_set_encap_proto(skb, vlan_header);
}
napi_gro_receive(&fep->napi, skb);
Also I cannot find any documentation stating what the difference is
between NETIF_F_HW_VLAN_CTAG_RX and NETIF_F_HW_VLAN_CTAG_FILTER, can
anyone define it?
The FILTER word on NETIF_F_HW_VLAN_CTAG_FILTER suggests it may be
applicable to received packets.
Thank you for your help and comments.
Jim Baxter
next reply other threads:[~2013-06-17 19:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-17 19:12 Jim Baxter [this message]
2013-06-18 14:41 ` VLAN driver question Ben Hutchings
2013-06-19 15:57 ` Jim Baxter
2013-06-19 16:33 ` Ben Hutchings
2013-06-20 19:05 ` Jim Baxter
2013-06-21 15:42 ` Ben Hutchings
2013-06-21 17:02 ` Jim Baxter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=51BF5F81.2040207@mentor.com \
--to=jim_baxter@mentor$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox