/* * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright(c) 2012 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * BSD LICENSE * * Copyright(c) 2012 Intel Corporation. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copy * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Intel PCIe NTB Network Linux driver * * Contact Information: * Jon Mason <jon.mason@intel.com> */ #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/ntb.h> #define NTB_NETDEV_VER "0.7" MODULE_DESCRIPTION(KBUILD_MODNAME); MODULE_VERSION(NTB_NETDEV_VER); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Intel Corporation"); struct ntb_netdev { struct list_head list; struct pci_dev *pdev; struct net_device *ndev; struct ntb_transport_qp *qp; }; #define NTB_TX_TIMEOUT_MS 1000 #define NTB_RXQ_SIZE 100 static LIST_HEAD(dev_list); static void ntb_netdev_event_handler(void *data, int status) { struct net_device *ndev = data; struct ntb_netdev *dev = netdev_priv(ndev); netdev_dbg(ndev, "Event %x, Link %x\n", status, ntb_transport_link_query(dev->qp)); /* Currently, only link status event is supported */ if (status) netif_carrier_on(ndev); else netif_carrier_off(ndev); } static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, int len) { struct net_device *ndev = qp_data; struct sk_buff *skb; int rc; skb = data; if (!skb) return; netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len); skb_put(skb, len); skb->protocol = eth_type_trans(skb, ndev); skb->ip_summed = CHECKSUM_NONE; if (netif_rx(skb) == NET_RX_DROP) { ndev->stats.rx_errors++; ndev->stats.rx_dropped++; } else { ndev->stats.rx_packets++; ndev->stats.rx_bytes += len; } skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); if (!skb) { ndev->stats.rx_errors++; ndev->stats.rx_frame_errors++; return; } rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN); if (rc) { dev_kfree_skb(skb); ndev->stats.rx_errors++; ndev->stats.rx_fifo_errors++; } } static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, int len) { struct net_device *ndev = qp_data; struct sk_buff *skb; skb = data; if (!skb || !ndev) return; if (len > 0) { ndev->stats.tx_packets++; ndev->stats.tx_bytes += skb->len; } else { ndev->stats.tx_errors++; ndev->stats.tx_aborted_errors++; } dev_kfree_skb(skb); } static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb, struct net_device *ndev) { struct ntb_netdev *dev = netdev_priv(ndev); int rc; netdev_dbg(ndev, "%s: skb len %d\n", __func__, skb->len); rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len); if (rc) goto err; return NETDEV_TX_OK; err: ndev->stats.tx_dropped++; ndev->stats.tx_errors++; return NETDEV_TX_BUSY; } static int ntb_netdev_open(struct net_device *ndev) { struct ntb_netdev *dev = netdev_priv(ndev); struct sk_buff *skb; int rc, i, len; /* Add some empty rx bufs */ for (i = 0; i < NTB_RXQ_SIZE; i++) { skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); if (!skb) { rc = -ENOMEM; goto err; } rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, ndev->mtu + ETH_HLEN); if (rc == -EINVAL) goto err; } netif_carrier_off(ndev); ntb_transport_link_up(dev->qp); return 0; err: while ((skb = ntb_transport_rx_remove(dev->qp, &len))) dev_kfree_skb(skb); return rc; } static int ntb_netdev_close(struct net_device *ndev) { struct ntb_netdev *dev = netdev_priv(ndev); struct sk_buff *skb; int len; ntb_transport_link_down(dev->qp); while ((skb = ntb_transport_rx_remove(dev->qp, &len))) dev_kfree_skb(skb); return 0; } static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu) { struct ntb_netdev *dev = netdev_priv(ndev); struct sk_buff *skb; int len, rc; if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN) return -EINVAL; if (!netif_running(ndev)) { ndev->mtu = new_mtu; return 0; } /* Bring down the link and dispose of posted rx entries */ ntb_transport_link_down(dev->qp); if (ndev->mtu < new_mtu) { int i; for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++) dev_kfree_skb(skb); for (; i; i--) { skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN); if (!skb) { rc = -ENOMEM; goto err; } rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, new_mtu + ETH_HLEN); if (rc) { dev_kfree_skb(skb); goto err; } } } ndev->mtu = new_mtu; ntb_transport_link_up(dev->qp); return 0; err: ntb_transport_link_down(dev->qp); while ((skb = ntb_transport_rx_remove(dev->qp, &len))) dev_kfree_skb(skb); netdev_err(ndev, "Error changing MTU, device inoperable\n"); return rc; } static const struct net_device_ops ntb_netdev_ops = { .ndo_open = ntb_netdev_open, .ndo_stop = ntb_netdev_close, .ndo_start_xmit = ntb_netdev_start_xmit, .ndo_change_mtu = ntb_netdev_change_mtu, .ndo_set_mac_address = eth_mac_addr, }; static void ntb_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info) { struct ntb_netdev *dev = netdev_priv(ndev); strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version)); strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info)); } static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { cmd->supported = SUPPORTED_Backplane; cmd->advertising = ADVERTISED_Backplane; cmd->speed = SPEED_UNKNOWN; ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN); cmd->duplex = DUPLEX_FULL; cmd->port = PORT_OTHER; cmd->phy_address = 0; cmd->transceiver = XCVR_DUMMY1; cmd->autoneg = AUTONEG_ENABLE; cmd->maxtxpkt = 0; cmd->maxrxpkt = 0; return 0; } static const struct ethtool_ops ntb_ethtool_ops = { .get_drvinfo = ntb_get_drvinfo, .get_link = ethtool_op_get_link, .get_settings = ntb_get_settings, }; static const struct ntb_queue_handlers ntb_netdev_handlers = { .tx_handler = ntb_netdev_tx_handler, .rx_handler = ntb_netdev_rx_handler, .event_handler = ntb_netdev_event_handler, }; static int ntb_netdev_probe(struct pci_dev *pdev) { struct net_device *ndev; struct ntb_netdev *dev; int rc; ndev = alloc_etherdev(sizeof(struct ntb_netdev)); if (!ndev) return -ENOMEM; dev = netdev_priv(ndev); dev->ndev = ndev; dev->pdev = pdev; BUG_ON(!dev->pdev); ndev->features = NETIF_F_HIGHDMA; ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; ndev->hw_features = ndev->features; ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS); random_ether_addr(ndev->perm_addr); memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len); ndev->netdev_ops = &ntb_netdev_ops; SET_ETHTOOL_OPS(ndev, &ntb_ethtool_ops); dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers); if (!dev->qp) { rc = -EIO; goto err; } ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN; rc = register_netdev(ndev); if (rc) goto err1; list_add(&dev->list, &dev_list); dev_info(&pdev->dev, "%s created\n", ndev->name); return 0; err1: ntb_transport_free_queue(dev->qp); err: free_netdev(ndev); return rc; } static void ntb_netdev_remove(struct pci_dev *pdev) { struct net_device *ndev; struct ntb_netdev *dev; list_for_each_entry(dev, &dev_list, list) { if (dev->pdev == pdev) break; } if (dev == NULL) return; ndev = dev->ndev; unregister_netdev(ndev); ntb_transport_free_queue(dev->qp); free_netdev(ndev); } static struct ntb_client ntb_netdev_client = { .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .probe = ntb_netdev_probe, .remove = ntb_netdev_remove, }; static int __init ntb_netdev_init_module(void) { int rc; rc = ntb_register_client_dev(KBUILD_MODNAME); if (rc) return rc; return ntb_register_client(&ntb_netdev_client); } module_init(ntb_netdev_init_module); static void __exit ntb_netdev_exit_module(void) { ntb_unregister_client(&ntb_netdev_client); ntb_unregister_client_dev(KBUILD_MODNAME); } module_exit(ntb_netdev_exit_module);