From ce6eea58eb8f50f563663c6e723b4bbbe55b012e Mon Sep 17 00:00:00 2001 From: Brian King Date: Fri, 8 Jun 2007 14:05:17 -0500 Subject: 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 Signed-off-by: Jeff Garzik --- drivers/net/ibmveth.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) (limited to 'drivers/net/ibmveth.c') diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index c04957a7df7d..6ec3d500f334 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -915,17 +915,36 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) { struct ibmveth_adapter *adapter = dev->priv; int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; - int i; + int reinit = 0; + int i, rc; if (new_mtu < IBMVETH_MAX_MTU) return -EINVAL; + for (i = 0; i < IbmVethNumBufferPools; i++) + if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) + break; + + if (i == IbmVethNumBufferPools) + return -EINVAL; + /* Look for an active buffer pool that can hold the new MTU */ for(i = 0; irx_buff_pool[i].active) - continue; + if (!adapter->rx_buff_pool[i].active) { + adapter->rx_buff_pool[i].active = 1; + reinit = 1; + } + if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) { - dev->mtu = new_mtu; + if (reinit && netif_running(adapter->netdev)) { + adapter->pool_config = 1; + ibmveth_close(adapter->netdev); + adapter->pool_config = 0; + dev->mtu = new_mtu; + if ((rc = ibmveth_open(adapter->netdev))) + return rc; + } else + dev->mtu = new_mtu; return 0; } } -- cgit v1.2.3