[PATCH] S2io: Support for runtime MTU change
Hi, Patch below supports MTU change on-the-fly(without bringing interface down) Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com> Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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@ -2849,6 +2849,7 @@ int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
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}
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txdp->Control_2 |= config->tx_intr_type;
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txdp->Control_1 |= (TXD_BUFFER0_SIZE(frg_len) |
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TXD_GATHER_CODE_FIRST);
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txdp->Control_1 |= TXD_LIST_OWN_XENA;
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@ -4246,14 +4247,6 @@ int s2io_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
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int s2io_change_mtu(struct net_device *dev, int new_mtu)
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{
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nic_t *sp = dev->priv;
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XENA_dev_config_t __iomem *bar0 = sp->bar0;
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register u64 val64;
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if (netif_running(dev)) {
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DBG_PRINT(ERR_DBG, "%s: Must be stopped to ", dev->name);
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DBG_PRINT(ERR_DBG, "change its MTU\n");
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return -EBUSY;
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}
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if ((new_mtu < MIN_MTU) || (new_mtu > S2IO_JUMBO_SIZE)) {
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DBG_PRINT(ERR_DBG, "%s: MTU size is invalid.\n",
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@ -4261,11 +4254,22 @@ int s2io_change_mtu(struct net_device *dev, int new_mtu)
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return -EPERM;
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}
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/* Set the new MTU into the PYLD register of the NIC */
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val64 = new_mtu;
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writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);
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dev->mtu = new_mtu;
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if (netif_running(dev)) {
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s2io_card_down(sp);
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netif_stop_queue(dev);
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if (s2io_card_up(sp)) {
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DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",
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__FUNCTION__);
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}
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if (netif_queue_stopped(dev))
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netif_wake_queue(dev);
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} else { /* Device is down */
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XENA_dev_config_t __iomem *bar0 = sp->bar0;
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u64 val64 = new_mtu;
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writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);
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}
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return 0;
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}
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