static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) { struct ibmveth_adapter *adapter = netdev_priv(dev); struct vio_dev *viodev = adapter->vdev; int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; int i; 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; for (i = 0; i < IbmVethNumBufferPools; i++) if (adapter->rx_buff_pool[i].active) { ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[i]); adapter->rx_buff_pool[i].active = 0; } for(i = 0; i<IbmVethNumBufferPools; i++) { adapter->rx_buff_pool[i].active = 1; if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) { if (netif_running(adapter->netdev)) { adapter->pool_config = 1; ibmveth_close(adapter->netdev); adapter->pool_config = 0; dev->mtu = new_mtu; vio_cmo_set_dev_desired(viodev, ibmveth_get_desired_dma (viodev)); return ibmveth_open(adapter->netdev); } dev->mtu = new_mtu; vio_cmo_set_dev_desired(viodev, ibmveth_get_desired_dma (viodev)); return 0; } } return -EINVAL; }
static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) { struct ibmveth_adapter *adapter = netdev_priv(dev); struct vio_dev *viodev = adapter->vdev; int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; int i, rc; int need_restart = 0; if (new_mtu < IBMVETH_MIN_MTU) return -EINVAL; for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) break; if (i == IBMVETH_NUM_BUFF_POOLS) return -EINVAL; /* Deactivate all the buffer pools so that the next loop can activate only the buffer pools necessary to hold the new MTU */ if (netif_running(adapter->netdev)) { need_restart = 1; adapter->pool_config = 1; ibmveth_close(adapter->netdev); adapter->pool_config = 0; } /* Look for an active buffer pool that can hold the new MTU */ for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { adapter->rx_buff_pool[i].active = 1; if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) { dev->mtu = new_mtu; vio_cmo_set_dev_desired(viodev, ibmveth_get_desired_dma (viodev)); if (need_restart) { return ibmveth_open(adapter->netdev); } return 0; } } if (need_restart && (rc = ibmveth_open(adapter->netdev))) return rc; return -EINVAL; }