[PATCH V3] cfg80211: vlan priority handling in WMM

[PATCH V3] cfg80211: vlan priority handling in WMM

[cedric.voncken]

From: cedric Voncken <cedric.voncken@acksys.fr>

If the VLAN tci is set in skb->vlan_tci use the priority field to determine the WMM priority.

Signed-off-by: cedric Voncken <cedric.voncken@acksys.fr>
---
 net/wireless/util.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

V2 modifications:
	Fix indentation
	Use symbolic constant
	include the header linux/if_vlan.h

V3 modifications:
	Check the vlan_tci validity with macro vlan_tx_tag_present
	Get the vlan_tci field value with macro vlan_tx_tag_get
	Request to netdev mailling list to know if the VLAN priority value 0 must be treated as no priority request. I add the Ben Hutchings reply below:
	IEEE 802.1q refers to the definition in 802.1d:

	> The user_priority parameter is the priority requested by the
	> originating service user. The value of this parameter is in the range
	> 0 through 7.
	>
	> NOTE -- The default user_priority value is 0. Values 1 through 7 form an
	> ordered sequence of user_priorities, with 1 being the lowest value and
	> 7 the highest. See 7.7.3 and Annex G (informative) for further
	> explanation of the use of user_priority values.

	So a value of 0 should be treated as no priority request, same as for an untagged frame.

diff --git a/net/wireless/util.c b/net/wireless/util.c
index ce090c1..9e4cac2 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -10,6 +10,7 @@
 #include <net/cfg80211.h>
 #include <net/ip.h>
 #include <net/dsfield.h>
+#include <linux/if_vlan.h>
 #include "core.h"
 #include "rdev-ops.h"
 
@@ -691,6 +692,7 @@ EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 {
 	unsigned int dscp;
+	unsigned char vlan_priority;
 
 	/* skb->priority values from 256->263 are magic values to
 	 * directly indicate a specific 802.1d priority.  This is used
@@ -700,6 +702,12 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 	if (skb->priority >= 256 && skb->priority <= 263)
 		return skb->priority - 256;
 
+	if(vlan_tx_tag_present(skb)) {
+		vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+		if (vlan_priority > 0)
+			return vlan_priority;
+	}
+
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
 		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
-- 
1.7.2.5

Re: [PATCH V3] cfg80211: vlan priority handling in WMM

[Johannes Berg]

On Wed, 2013-08-21 at 15:48 +0200, cedric.voncken@acksys.fr wrote:

> +	if(vlan_tx_tag_present(skb)) {

need space

> +		vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;

>80 cols

johannes