ibmveth: Automatically enable larger rx buffer pools for larger mtu
Currently, ibmveth maintains several rx buffer pools, which can be modified through sysfs. By default, pools are not allocated by default such that jumbo frames cannot be supported without first activating larger rx buffer pools. This results in failures when attempting to change the mtu. This patch makes ibmveth automatically allocate these larger buffer pools when the mtu is changed. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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4aa9c93e1c
Коммит
ce6eea58eb
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@ -915,17 +915,36 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct ibmveth_adapter *adapter = dev->priv;
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int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
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int i;
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int reinit = 0;
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int i, rc;
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if (new_mtu < IBMVETH_MAX_MTU)
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return -EINVAL;
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for (i = 0; i < IbmVethNumBufferPools; i++)
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if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
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break;
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if (i == IbmVethNumBufferPools)
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return -EINVAL;
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/* Look for an active buffer pool that can hold the new MTU */
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for(i = 0; i<IbmVethNumBufferPools; i++) {
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if (!adapter->rx_buff_pool[i].active)
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continue;
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if (!adapter->rx_buff_pool[i].active) {
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adapter->rx_buff_pool[i].active = 1;
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reinit = 1;
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}
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if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
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dev->mtu = new_mtu;
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if (reinit && netif_running(adapter->netdev)) {
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adapter->pool_config = 1;
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ibmveth_close(adapter->netdev);
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adapter->pool_config = 0;
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dev->mtu = new_mtu;
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if ((rc = ibmveth_open(adapter->netdev)))
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return rc;
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} else
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dev->mtu = new_mtu;
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return 0;
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}
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}
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