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Commit 11bdb3b3 authored by Vamsi Krishna's avatar Vamsi Krishna Committed by Gerrit - the friendly Code Review server
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usb: gadget: u_ether: add tx multipler module param 



Usually tx rates are higher than rx rates and it deserve higher
number of requests. For LTE category 6 data rates of 300Mbps
(about 30 1.5KB packets per milli-sec), the current maximum of 40
usb request may not be sufficient. At this rate and with
interrupt moderation of interconnect, data can be very bursty.
Add module parameter to configure number of tx usb requests that
can change for different driver configurations.

Change-Id: I2a380274b62bbcfa46d1147ff463b461229431cd
Signed-off-by: default avatarVamsi Krishna <vskrishn@codeaurora.org>
Signed-off-by: default avatarAjay Agarwal <ajaya@codeaurora.org>
parent 3cdaa366

drivers/usb/gadget/function/u_ether.c

+13 −1
Original line number Diff line number Diff line
@@ -115,6 +115,18 @@ static void uether_debugfs_exit(struct eth_dev *dev); 


#define DEFAULT_QLEN	2	/* double buffering by default */



/*

 * Usually downlink rates are higher than uplink rates and it

 * deserve higher number of requests. For CAT-6 data rates of

 * 300Mbps (~30 packets per milli-sec) 40 usb request may not

 * be sufficient. At this rate and with interrupt moderation

 * of interconnect, data can be very bursty. tx_qmult is the

 * additional multipler on qmult.

 */

static unsigned int tx_qmult = 1;

module_param(tx_qmult, uint, 0644);

MODULE_PARM_DESC(tx_qmult, "Additional queue length multiplier for tx");



/* for dual-speed hardware, use deeper queues at high/super speed */

static inline int qlen(struct usb_gadget *gadget, unsigned qmult)

{
@@ -418,7 +430,7 @@ static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n) 


	spin_lock(&dev->req_lock);

	if (link->in_ep) {

		status = prealloc(&dev->tx_reqs, link->in_ep, n);

		status = prealloc(&dev->tx_reqs, link->in_ep, n * tx_qmult);

			if (status < 0)

			goto fail;

	}