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Commit e9b3eb61 authored by Sai Krishna Juturi's avatar Sai Krishna Juturi Committed by Sriharsha Allenki
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usb: gadget: u_ether: Changes to enable skb timestamping 



Timestamp is recorded for the exit of a packet,
and just after the driver delivers the packet to
network stack. This feature is disabled by default.

To enable timestamping use this command:
echo 1 > /sys/module/g_android/parameters/skb_timestamp_enable

Change-Id: I1022fd3021699d07460054984bf95f2bbef9f29d
Signed-off-by: default avatarSriharsha Allenki <sallenki@codeaurora.org>
Signed-off-by: default avatarSai Krishna Juturi <jsaikrishna@codeaurora.org>
parent 1a7276f0

drivers/usb/gadget/function/u_ether.c

+19 −1
Original line number Diff line number Diff line
@@ -71,6 +71,11 @@ module_param(min_cpu_freq, uint, S_IRUGO | S_IWUSR); 
MODULE_PARM_DESC(min_cpu_freq,

	"to set minimum cpu frquency to when ethernet ifc is active");



static unsigned int skb_timestamp_enable;

module_param(skb_timestamp_enable, uint, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(skb_timestamp_enable,

	"to enable timestamping for TX and RX packets");



/* this refers to max number sgs per transfer

 * which includes headers/data packets

 */
@@ -677,6 +682,8 @@ static void process_rx_w(struct work_struct *work) 
		dev->net->stats.rx_packets++;

		dev->net->stats.rx_bytes += skb->len;



		if (skb_timestamp_enable)

			skb->tstamp = ktime_get();

		status = netif_rx_ni(skb);

	}

	set_wake_up_idle(false);
@@ -1064,13 +1071,14 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb, 
	int			extra_alloc = 0;

	int			retval;

	struct usb_request	*req = NULL;

	struct sk_buff		*new_skb;

	struct sk_buff		*new_skb, *clone = NULL;

	unsigned long		flags;

	struct usb_ep		*in = NULL;

	u16			cdc_filter = 0;

	bool			multi_pkt_xfer = false;

	u32			fixed_in_len;

	bool			is_fixed;

	struct skb_shared_hwtstamps hwtstamps;



	spin_lock_irqsave(&dev->lock, flags);

	if (dev->port_usb) {
@@ -1284,6 +1292,16 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb, 
		req->no_interrupt = 0;

	}



	if (skb_timestamp_enable) {

		skb->tstamp = ktime_get();

		clone = skb_clone_sk(skb);

		if (clone) {

			memset(&hwtstamps, 0,

					sizeof(struct skb_shared_hwtstamps));

			skb_complete_tx_timestamp(clone, &hwtstamps);

		}

	}



	retval = usb_ep_queue(in, req, GFP_ATOMIC);

	switch (retval) {

	default: