From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 25 Aug 2020 05:55:04 +0000 (+0900)
Subject: usb: gadget: f_ncm: set SuperSpeed bulk descriptor bMaxBurst to 15
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a176b1a2a73c9598f77f2fa3df67184321092f55;p=linux.git

usb: gadget: f_ncm: set SuperSpeed bulk descriptor bMaxBurst to 15

This improves performance on fast connections. When directly
connecting to a Linux laptop running 5.6, single-stream iperf3
goes from ~1.7Gbps to ~2.3Gbps out, and from ~620Mbps to ~720Mbps
in.

Reviewed-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
---

diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c
index 7672fa25085b0..ffa397a1c3d48 100644
--- a/drivers/usb/gadget/function/f_ncm.c
+++ b/drivers/usb/gadget/function/f_ncm.c
@@ -378,7 +378,7 @@ static struct usb_ss_ep_comp_descriptor ss_ncm_bulk_comp_desc = {
 	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
 
 	/* the following 2 values can be tweaked if necessary */
-	/* .bMaxBurst =		0, */
+	.bMaxBurst =		15,
 	/* .bmAttributes =	0, */
 };