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Commit a5898ea0 authored by Harini Katakam's avatar Harini Katakam Committed by David S. Miller
Browse files

net: macb: Add change_mtu callback with jumbo support 



Add macb_change_mtu callback; if jumbo frame support is present allow
mtu size changes upto (jumbo max length allowed - headers).

Signed-off-by: default avatarHarini Katakam <harinik@xilinx.com>
Reviewed-by: default avatarPunnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 98b5a0f4

drivers/net/ethernet/cadence/macb.c

+23 −1
Original line number Diff line number Diff line
@@ -54,6 +54,8 @@ 
#define MACB_MAX_TX_LEN		((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))

#define GEM_MAX_TX_LEN		((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))



#define GEM_MTU_MIN_SIZE	68



/*

 * Graceful stop timeouts in us. We should allow up to

 * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
@@ -1855,6 +1857,26 @@ static int macb_close(struct net_device *dev) 
	return 0;

}



static int macb_change_mtu(struct net_device *dev, int new_mtu)

{

	struct macb *bp = netdev_priv(dev);

	u32 max_mtu;



	if (netif_running(dev))

		return -EBUSY;



	max_mtu = ETH_DATA_LEN;

	if (bp->caps | MACB_CAPS_JUMBO)

		max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;



	if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE))

		return -EINVAL;



	dev->mtu = new_mtu;



	return 0;

}



static void gem_update_stats(struct macb *bp)

{

	int i;
@@ -2131,7 +2153,7 @@ static const struct net_device_ops macb_netdev_ops = { 
	.ndo_get_stats		= macb_get_stats,

	.ndo_do_ioctl		= macb_ioctl,

	.ndo_validate_addr	= eth_validate_addr,

	.ndo_change_mtu		= eth_change_mtu,

	.ndo_change_mtu		= macb_change_mtu,

	.ndo_set_mac_address	= eth_mac_addr,

#ifdef CONFIG_NET_POLL_CONTROLLER

	.ndo_poll_controller	= macb_poll_controller,