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net: cdc_ncm: update datagram size after changing mtu 

Current implementation updates the mtu size and notify cdc_ncm
device using USB_CDC_SET_MAX_DATAGRAM_SIZE request about datagram
size change instead of changing rx_urb_size.

Whenever mtu is being changed, datagram size should also be
updated. Also updating maxmtu formula so it takes max_datagram_size with
use of cdc_ncm_max_dgram_size() and not ctx.

Signed-off-by: Robert Dobrowolski <robert.dobrowolski@linux.intel.com>
Signed-off-by: Rafal Redzimski <rafal.f.redzimski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rafal Redzimski 2016-05-19 11:56:09 +02:00 committed by David S. Miller
parent addf8fc4ac
commit 05a5648717
1 changed files with 4 additions and 2 deletions
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6
drivers/net/usb/cdc_ncm.c
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@ -740,12 +740,14 @@ static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
if (new_mtu <= 0 || new_mtu > maxmtu)
return -EINVAL;
net->mtu = new_mtu;
cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
return 0;
}
EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);