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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>
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@ -740,12 +740,14 @@ static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
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int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
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{
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struct usbnet *dev = netdev_priv(net);
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struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
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int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
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int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
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if (new_mtu <= 0 || new_mtu > maxmtu)
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return -EINVAL;
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net->mtu = new_mtu;
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cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
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return 0;
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}
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EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
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