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net: macb: Add change_mtu callback with jumbo support

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

Signed-off-by: Harini Katakam <harinik@xilinx.com>
Reviewed-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harini Katakam 2015-05-06 22:27:18 +05:30 committed by David S. Miller
parent 98b5a0f4a2
commit a5898ea09a
1 changed files with 23 additions and 1 deletions
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24
drivers/net/ethernet/cadence/macb.c
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@ -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,