From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harini Katakam Subject: [net-next PATCH v3 4/4] net: macb: Add change_mtu callback with jumbo support Date: Wed, 6 May 2015 22:27:18 +0530 Message-ID: <1430931438-32592-4-git-send-email-harinik@xilinx.com> References: <1430931438-32592-1-git-send-email-harinik@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , To: , , , , , , , , , Return-path: In-Reply-To: <1430931438-32592-1-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org 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 Reviewed-by: Punnaiah Choudary Kalluri --- v3: Check for jumbo capability in macb_config. 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 cb84587..97c6646 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 + /* * 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, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html