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Commit 6944215f authored by Utkarsh Saxena's avatar Utkarsh Saxena
Browse files

micrel: changes to enable qos and timestamping in ks8851 



change optimizes throughput by smoothing latency for DMA access
by tx and rx buffers, and timestamping to record the exit of
packet just before driver tries to write the data to spi interface

Change-Id: Ib58847aade2ba543a8c149d03215dcdf014f2996
Acked-by: default avatarDon Gosnell <dgosnell@qti.qualcomm.com>
Acked-by: default avatarChaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: default avatarUtkarsh Saxena <usaxena@codeaurora.org>
parent 7d1f049b

drivers/net/ethernet/micrel/ks8851.c

+14 −2
Original line number Diff line number Diff line
@@ -110,6 +110,7 @@ union ks8851_tx_hdr { 
 * modifies.

 */

struct ks8851_net {

	struct pm_qos_request qos_request;

	struct net_device	*netdev;

	struct spi_device	*spidev;

	struct mutex		lock;
@@ -635,6 +636,7 @@ static void ks8851_rx_pkts3(struct ks8851_net *ks) 
			ks8851_dbg_dumpkkt(ks, rxpkt);



		skb->protocol = eth_type_trans(skb, ks->netdev);

		skb->tstamp = ktime_get();

		netif_rx_ni(skb);



		/* record packet stats */
@@ -769,7 +771,7 @@ static void ks8851_wrpkts3(struct ks8851_net *ks) 
	int ret;



	struct net_device *dev = ks->netdev;

	struct sk_buff *txb;

	struct sk_buff *txb, *clone = NULL;

	u8 *buf = NULL;

	u16 len = 0;

	u8 count = 0;
@@ -779,6 +781,7 @@ static void ks8851_wrpkts3(struct ks8851_net *ks) 
	u16 len32;

	u32 *buf32;

	bool last;

	struct skb_shared_hwtstamps hwtstamps;



	last = skb_queue_empty(&ks->txq);

	opc[0] = KS_SPIOP_TXFIFO;
@@ -821,6 +824,14 @@ static void ks8851_wrpkts3(struct ks8851_net *ks) 
			len += 4+ALIGN(txb->len, 4);

			dev->stats.tx_bytes += txb->len;

			dev->stats.tx_packets++;

			txb->tstamp = ktime_get();

			/* create clone for us to return on the Tx path */

			clone = skb_clone_sk(txb);

			if (clone) {

				memset(&hwtstamps, 0,

				       sizeof(struct skb_shared_hwtstamps));

				skb_complete_tx_timestamp(clone, &hwtstamps);

			}

			dev_kfree_skb(txb);

		}

	}
@@ -884,7 +895,7 @@ static int ks8851_net_open(struct net_device *dev) 
	/* lock the card, even if we may not actually be doing anything

	 * else at the moment */

	mutex_lock(&ks->lock);



	pm_qos_add_request(&ks->qos_request, PM_QOS_CPU_DMA_LATENCY, 1);

	netif_dbg(ks, ifup, ks->netdev, "opening\n");



	/* bring chip out of any power saving mode it was in */
@@ -968,6 +979,7 @@ static int ks8851_net_stop(struct net_device *dev) 
	netif_stop_queue(dev);



	mutex_lock(&ks->lock);

	pm_qos_remove_request(&ks->qos_request);

	/* turn off the IRQs and ack any outstanding */

	ks8851_wrreg16(ks, KS_IER, 0x0000);

	ks8851_wrreg16(ks, KS_ISR, 0xffff);