netdev - [PATCH 2/2] caif: performance bugfix - allow radio stack to prioritize packets.

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Date:	Mon, 11 Apr 2011 22:11:30 +0200
From:	sjur.brandeland@...ricsson.com
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, sjurbren@...il.com,
	Sjur Brændeland <sjur.brandeland@...ricsson.com>
Subject: [PATCH 2/2] caif: performance bugfix - allow radio stack to prioritize
 packets.

From: Sjur Brændeland <sjur.brandeland@...ricsson.com>

    In the CAIF Payload message the Packet Type indication must be set to
    UNCLASSIFIED in order to allow packet prioritization in the modem's
    network stack. Otherwise TCP-Ack is not prioritized in the modems
    transmit queue.

Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
---
 net/caif/cfdgml.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/net/caif/cfdgml.c b/net/caif/cfdgml.c
index a4ce294..0382dec 100644
--- a/net/caif/cfdgml.c
+++ b/net/caif/cfdgml.c
@@ -13,6 +13,7 @@
 #include <net/caif/cfsrvl.h>
 #include <net/caif/cfpkt.h>
 
+
 #define container_obj(layr) ((struct cfsrvl *) layr)
 
 #define DGM_CMD_BIT  0x80
@@ -83,6 +84,7 @@ static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
 
 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
 {
+	u8 packet_type;
 	u32 zero = 0;
 	struct caif_payload_info *info;
 	struct cfsrvl *service = container_obj(layr);
@@ -94,7 +96,9 @@ static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
 	if (cfpkt_getlen(pkt) > DGM_MTU)
 		return -EMSGSIZE;
 
-	cfpkt_add_head(pkt, &zero, 4);
+	cfpkt_add_head(pkt, &zero, 3);
+	packet_type = 0x08; /* B9 set - UNCLASSIFIED */
+	cfpkt_add_head(pkt, &packet_type, 1);
 
 	/* Add info for MUX-layer to route the packet out. */
 	info = cfpkt_info(pkt);
-- 
1.7.0.4

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