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mt76: speed up usb bulk copy

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Use larger batches for usb copy to speed this operation up. Otherwise it
would be too slow for copying new beacons or broadcast frames over usb.
Assure, that always a multiple of 4 Bytes is copied, as outlined in
850e8f6fbd "mt76: round up length on mt76_wr_copy" from Felix Fietkau.

Signed-off-by: Markus Theil <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Markus Theil
2019-12-22 15:17:42 +01:00
committed by Felix Fietkau
parent 462a16e185
commit fa24aba4c2
2 changed files with 19 additions and 7 deletions
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usb.c
+18 -6
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@@ -149,18 +149,30 @@ static void mt76u_copy(struct mt76_dev *dev, u32 offset,
const void *data, int len)
{
struct mt76_usb *usb = &dev->usb;
const u32 *val = data;
int i, ret;
const u8 *val = data;
int ret;
int current_batch_size;
int i = 0;
/* Assure that always a multiple of 4 bytes are copied,
* otherwise beacons can be corrupted.
* See: "mt76: round up length on mt76_wr_copy"
* Commit 850e8f6fbd5d0003b0
*/
len = round_up(len, 4);
mutex_lock(&usb->usb_ctrl_mtx);
for (i = 0; i < DIV_ROUND_UP(len, 4); i++) {
put_unaligned(val[i], (u32 *)usb->data);
while (i < len) {
current_batch_size = min_t(int, sizeof(usb->data), len - i);
memcpy(usb->data, val + i, current_batch_size);
ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE,
USB_DIR_OUT | USB_TYPE_VENDOR,
0, offset + i * 4, usb->data,
sizeof(u32));
0, offset + i, usb->data,
current_batch_size);
if (ret < 0)
break;
i += current_batch_size;
}
mutex_unlock(&usb->usb_ctrl_mtx);
}