net: cdc_ncm: support rx_max/tx_max updates when running
Finish the rx_max/tx_max setup by flushing buffers and
informing usbnet about the changes. This way, the settings
can be modified while the netdev is up and running.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 7a3de73c..2ec3790 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -89,11 +89,20 @@
min, max, val);
}
+ /* usbnet use these values for sizing rx queues */
+ dev->rx_urb_size = val;
+
/* inform device about NTB input size changes */
if (val != ctx->rx_max) {
__le32 dwNtbInMaxSize = cpu_to_le32(val);
dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
+
+ /* need to unlink rx urbs before increasing buffer size */
+ if (netif_running(dev->net) && dev->rx_urb_size > ctx->rx_max)
+ usbnet_unlink_rx_urbs(dev);
+
+ /* tell device to use new size */
if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
@@ -117,7 +126,6 @@
}
if (val != ctx->tx_max)
dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
- ctx->tx_max = val;
/* Adding a pad byte here if necessary simplifies the handling
* in cdc_ncm_fill_tx_frame, making tx_max always represent
@@ -126,13 +134,24 @@
* We cannot use dev->maxpacket here because this is called from
* .bind which is called before usbnet sets up dev->maxpacket
*/
- if (ctx->tx_max != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
- ctx->tx_max % usb_maxpacket(dev->udev, dev->out, 1) == 0)
- ctx->tx_max++;
+ if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
+ val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
+ val++;
- /* usbnet use these values for sizing tx/rx queues */
+ /* we might need to flush any pending tx buffers if running */
+ if (netif_running(dev->net) && val > ctx->tx_max) {
+ netif_tx_lock_bh(dev->net);
+ usbnet_start_xmit(NULL, dev->net);
+ ctx->tx_max = val;
+ netif_tx_unlock_bh(dev->net);
+ } else {
+ ctx->tx_max = val;
+ }
+
dev->hard_mtu = ctx->tx_max;
- dev->rx_urb_size = ctx->rx_max;
+
+ /* max qlen depend on hard_mtu and rx_urb_size */
+ usbnet_update_max_qlen(dev);
}
/* helpers for NCM and MBIM differences */
