ar71xx: ag71xx: store descriptor packet length mask in ag71xx struct

The currently used bitmask is not correct for all SoCs.
Introduce a new field in struct ag71xx and store the
bitmask in that. Use the current value for now, it will
be adjusted for each SoCs in further patches.

Aslo use the new field directly in the ag71xx_rx_packets
and ag71xx_hard_start_xmit() functions and remove the
ag71xx_desc_pktlen() helper.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39144

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h

@@ -166,6 +166,7 @@ struct ag71xx {
 	int			duplex;
 
 	unsigned int		max_frame_len;
+	unsigned int		desc_pktlen_mask;
 	unsigned int		rx_buf_size;
 
 	struct work_struct	restart_work;
@@ -198,11 +199,6 @@ static inline int ag71xx_desc_empty(struct ag71xx_desc *desc)
 	return (desc->ctrl & DESC_EMPTY) != 0;
 }
 
-static inline int ag71xx_desc_pktlen(struct ag71xx_desc *desc)
-{
-	return desc->ctrl & DESC_PKTLEN_M;
-}
-
 /* Register offsets */
 #define AG71XX_REG_MAC_CFG1	0x0000
 #define AG71XX_REG_MAC_CFG2	0x0004

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c

@@ -692,7 +692,7 @@ static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
 
 	/* setup descriptor fields */
 	desc->data = (u32) dma_addr;
-	desc->ctrl = (skb->len & DESC_PKTLEN_M);
+	desc->ctrl = skb->len & ag->desc_pktlen_mask;
 
 	/* flush descriptor */
 	wmb();
@@ -866,6 +866,7 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 	struct net_device *dev = ag->dev;
 	struct ag71xx_ring *ring = &ag->rx_ring;
 	int offset = ag71xx_buffer_offset(ag);
+	unsigned int pktlen_mask = ag->desc_pktlen_mask;
 	int done = 0;
 
 	DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
@@ -888,7 +889,7 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 
 		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 
-		pktlen = ag71xx_desc_pktlen(desc);
+		pktlen = desc->ctrl & pktlen_mask;
 		pktlen -= ETH_FCS_LEN;
 
 		dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
@@ -1169,6 +1170,7 @@ static int ag71xx_probe(struct platform_device *pdev)
 	ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
 
 	ag->max_frame_len = AG71XX_TX_MTU_LEN;
+	ag->desc_pktlen_mask = DESC_PKTLEN_MASK;
 
 	ag->stop_desc = dma_alloc_coherent(NULL,
 		sizeof(struct ag71xx_desc), &ag->stop_desc_dma, GFP_KERNEL);