[net-next PATCH v2 3/3] net: macb: Add change_mtu callback with jumbo support
From: Harini Katakam <hidden>
Date: 2015-05-04 07:53:10
Also in:
linux-devicetree, lkml
Subsystem:
atmel macb ethernet driver, networking drivers, the rest · Maintainers:
Théo Lebrun, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> Reviewed-by: Punnaiah Choudary Kalluri <redacted> --- v2: Move constant definition. --- drivers/net/ethernet/cadence/macb.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index a065283..e4a9c17 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c@@ -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 + #define GEM_ZYNQMP_JUMBO_MAX 10240 /*
@@ -1857,6 +1859,26 @@ 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->isjumbo) + 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;
@@ -2133,7 +2155,7 @@ 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,
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1.7.9.5