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net: cdc_ncm: support rx_max/tx_max updates when running

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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>
This commit is contained in:
Bjørn Mork 2014-05-16 21:48:21 +02:00 committed by David S. Miller
parent 08c74fc901
commit 68864abf08
1 changed files with 25 additions and 6 deletions
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31
drivers/net/usb/cdc_ncm.c
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@ -89,11 +89,20 @@ static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
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 @@ static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
}
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 @@ static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
* 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++;
/* 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;
}
/* usbnet use these values for sizing tx/rx queues */
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 */