Commit 0b0a5384 authored Oct 10, 2017 by Vijayavardhan Vennapusa Committed by Gerrit - the friendly Code Review server Oct 16, 2017

USB: rndis: Honor dl_max_packet_size value sent by host



This change starts using dl_max_packet_size value sent by host
as part of USB RNDIS init message communication. Using default
dl_max_packet_size value results into low throughput with more
data loss on host side as host side RNDIS can't support
de-aggregation (applicable for Linux Host RNDIS driver) or it
ignores received more data then host side RNDIS can handle. To
use fine tune dl_max_packet_size for better throughput, driver
selects minimum value between host supported dl_max_packet_size
and default size (i.e. 9216 bytes as RNDIS IN aggregation size).

Change-Id: I00c81bc905a032867c537536b01bf32584c37e63
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>

parent 7eede150

drivers/usb/gadget/function/f_gsi.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -1577,6 +1577,7 @@ static void gsi_rndis_command_complete(struct usb_ep *ep,
		struct usb_request *req)
		{
		struct f_gsi *rndis = req->context;
		rndis_init_msg_type *buf;
		int status;

		if (req->status != 0) {
		@@ -1589,6 +1590,16 @@ static void gsi_rndis_command_complete(struct usb_ep *ep,
		if (status < 0)
		log_event_err("RNDIS command error %d, %d/%d",
		status, req->actual, req->length);

		buf = (rndis_init_msg_type *)req->buf;
		if (buf->MessageType == RNDIS_MSG_INIT) {
		rndis->d_port.in_aggr_size = min_t(u32,
		rndis->d_port.in_aggr_size,
		rndis->params->dl_max_xfer_size);
		log_event_dbg("RNDIS host dl_aggr_size:%d in_aggr_size:%d\n",
		rndis->params->dl_max_xfer_size,
		rndis->d_port.in_aggr_size);
		}
		}

		static void