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net: Add support for NTB virtual ethernet device
A virtual ethernet device that uses the NTB transport API to send/receive data. Signed-off-by: Jon Mason <jon.mason@intel.com> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jon Mason
Greg Kroah-Hartman
parent
fce8a7bb5b
commit
548c237c0a
@ -5398,6 +5398,7 @@ NTB DRIVER
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M: Jon Mason <jon.mason@intel.com>
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S: Supported
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F: drivers/ntb/
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F: drivers/net/ntb_netdev.c
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F: include/linux/ntb.h
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NTFS FILESYSTEM
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@ -189,6 +189,10 @@ config NETPOLL_TRAP
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config NET_POLL_CONTROLLER
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def_bool NETPOLL
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config NTB_NETDEV
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tristate "Virtual Ethernet over NTB"
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depends on NTB
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config RIONET
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tristate "RapidIO Ethernet over messaging driver support"
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depends on RAPIDIO
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@ -71,3 +71,4 @@ obj-$(CONFIG_USB_IPHETH) += usb/
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obj-$(CONFIG_USB_CDC_PHONET) += usb/
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obj-$(CONFIG_HYPERV_NET) += hyperv/
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obj-$(CONFIG_NTB_NETDEV) += ntb_netdev.o
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419
drivers/net/ntb_netdev.c
Normal file
419
drivers/net/ntb_netdev.c
Normal file
@ -0,0 +1,419 @@
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/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copy
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Intel PCIe NTB Network Linux driver
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*
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* Contact Information:
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* Jon Mason <jon.mason@intel.com>
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*/
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/ntb.h>
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#define NTB_NETDEV_VER "0.6"
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MODULE_DESCRIPTION(KBUILD_MODNAME);
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MODULE_VERSION(NTB_NETDEV_VER);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Intel Corporation");
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struct ntb_netdev {
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struct list_head list;
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struct pci_dev *pdev;
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struct net_device *ndev;
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struct ntb_transport_qp *qp;
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};
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#define NTB_TX_TIMEOUT_MS 1000
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#define NTB_RXQ_SIZE 100
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static LIST_HEAD(dev_list);
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static void ntb_netdev_event_handler(void *data, int status)
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{
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struct net_device *ndev = data;
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struct ntb_netdev *dev = netdev_priv(ndev);
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netdev_dbg(ndev, "Event %x, Link %x\n", status,
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ntb_transport_link_query(dev->qp));
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/* Currently, only link status event is supported */
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if (status)
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netif_carrier_on(ndev);
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else
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netif_carrier_off(ndev);
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}
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static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len)
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{
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struct net_device *ndev = qp_data;
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struct sk_buff *skb;
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int rc;
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skb = data;
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if (!skb)
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return;
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netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len);
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skb_put(skb, len);
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skb->protocol = eth_type_trans(skb, ndev);
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skb->ip_summed = CHECKSUM_NONE;
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if (netif_rx(skb) == NET_RX_DROP) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_dropped++;
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} else {
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ndev->stats.rx_packets++;
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ndev->stats.rx_bytes += len;
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}
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skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
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if (!skb) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_frame_errors++;
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return;
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}
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rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN);
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if (rc) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_fifo_errors++;
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}
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}
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static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len)
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{
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struct net_device *ndev = qp_data;
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struct sk_buff *skb;
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skb = data;
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if (!skb || !ndev)
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return;
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if (len > 0) {
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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} else {
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ndev->stats.tx_errors++;
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ndev->stats.tx_aborted_errors++;
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}
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dev_kfree_skb(skb);
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if (netif_queue_stopped(ndev))
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netif_wake_queue(ndev);
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}
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static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
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struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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int rc;
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netdev_dbg(ndev, "ntb_transport_tx_enqueue\n");
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rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
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if (rc)
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goto err;
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return NETDEV_TX_OK;
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err:
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ndev->stats.tx_dropped++;
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ndev->stats.tx_errors++;
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netif_stop_queue(ndev);
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return NETDEV_TX_BUSY;
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}
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static int ntb_netdev_open(struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int rc, i, len;
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/* Add some empty rx bufs */
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for (i = 0; i < NTB_RXQ_SIZE; i++) {
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skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
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if (!skb) {
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rc = -ENOMEM;
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goto err;
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}
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rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
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ndev->mtu + ETH_HLEN);
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if (rc == -EINVAL)
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goto err;
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}
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netif_carrier_off(ndev);
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ntb_transport_link_up(dev->qp);
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return 0;
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err:
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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return rc;
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}
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static int ntb_netdev_close(struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int len;
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ntb_transport_link_down(dev->qp);
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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return 0;
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}
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static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int len, rc;
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if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN)
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return -EINVAL;
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if (!netif_running(ndev)) {
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ndev->mtu = new_mtu;
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return 0;
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}
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/* Bring down the link and dispose of posted rx entries */
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ntb_transport_link_down(dev->qp);
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if (ndev->mtu < new_mtu) {
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int i;
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for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++)
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dev_kfree_skb(skb);
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for (; i; i--) {
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skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN);
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if (!skb) {
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rc = -ENOMEM;
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goto err;
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}
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rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
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new_mtu + ETH_HLEN);
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if (rc) {
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dev_kfree_skb(skb);
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goto err;
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}
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}
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}
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ndev->mtu = new_mtu;
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ntb_transport_link_up(dev->qp);
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return 0;
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err:
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ntb_transport_link_down(dev->qp);
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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netdev_err(ndev, "Error changing MTU, device inoperable\n");
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return rc;
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}
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static void ntb_netdev_tx_timeout(struct net_device *ndev)
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{
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if (netif_running(ndev))
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netif_wake_queue(ndev);
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}
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static const struct net_device_ops ntb_netdev_ops = {
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.ndo_open = ntb_netdev_open,
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.ndo_stop = ntb_netdev_close,
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.ndo_start_xmit = ntb_netdev_start_xmit,
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.ndo_change_mtu = ntb_netdev_change_mtu,
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.ndo_tx_timeout = ntb_netdev_tx_timeout,
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.ndo_set_mac_address = eth_mac_addr,
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};
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static void ntb_get_drvinfo(struct net_device *ndev,
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struct ethtool_drvinfo *info)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
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strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version));
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strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info));
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}
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static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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{
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cmd->supported = SUPPORTED_Backplane;
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cmd->advertising = ADVERTISED_Backplane;
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cmd->speed = SPEED_UNKNOWN;
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ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN);
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cmd->duplex = DUPLEX_FULL;
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cmd->port = PORT_OTHER;
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cmd->phy_address = 0;
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cmd->transceiver = XCVR_DUMMY1;
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cmd->autoneg = AUTONEG_ENABLE;
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cmd->maxtxpkt = 0;
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cmd->maxrxpkt = 0;
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return 0;
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}
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static const struct ethtool_ops ntb_ethtool_ops = {
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.get_drvinfo = ntb_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_settings = ntb_get_settings,
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};
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static const struct ntb_queue_handlers ntb_netdev_handlers = {
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.tx_handler = ntb_netdev_tx_handler,
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.rx_handler = ntb_netdev_rx_handler,
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.event_handler = ntb_netdev_event_handler,
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};
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static int __devinit ntb_netdev_probe(struct pci_dev *pdev)
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{
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struct net_device *ndev;
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struct ntb_netdev *dev;
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int rc;
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ndev = alloc_etherdev(sizeof(struct ntb_netdev));
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if (!ndev)
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return -ENOMEM;
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dev = netdev_priv(ndev);
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dev->ndev = ndev;
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dev->pdev = pdev;
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BUG_ON(!dev->pdev);
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ndev->features = NETIF_F_HIGHDMA;
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ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
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ndev->hw_features = ndev->features;
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ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS);
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random_ether_addr(ndev->perm_addr);
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memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len);
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ndev->netdev_ops = &ntb_netdev_ops;
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SET_ETHTOOL_OPS(ndev, &ntb_ethtool_ops);
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dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers);
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if (!dev->qp) {
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rc = -EIO;
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goto err;
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}
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ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN;
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rc = register_netdev(ndev);
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if (rc)
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goto err1;
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list_add(&dev->list, &dev_list);
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pr_info("%s: %s created\n", KBUILD_MODNAME, ndev->name);
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return 0;
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err1:
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ntb_transport_free_queue(dev->qp);
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err:
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free_netdev(ndev);
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return rc;
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}
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static void __exit ntb_netdev_remove(struct pci_dev *pdev)
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{
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struct net_device *ndev;
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struct ntb_netdev *dev;
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list_for_each_entry(dev, &dev_list, list) {
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if (dev->pdev == pdev)
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break;
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}
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if (dev == NULL)
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return;
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ndev = dev->ndev;
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unregister_netdev(ndev);
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ntb_transport_free_queue(dev->qp);
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free_netdev(ndev);
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}
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static struct ntb_client ntb_netdev_client = {
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.probe = ntb_netdev_probe,
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.remove = ntb_netdev_remove,
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};
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static int __init ntb_netdev_init_module(void)
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{
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int rc;
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rc = ntb_register_client_dev(KBUILD_MODNAME);
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if (rc)
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return rc;
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return ntb_register_client(&ntb_netdev_client);
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}
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module_init(ntb_netdev_init_module);
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static void __exit ntb_netdev_exit_module(void)
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{
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ntb_unregister_client(&ntb_netdev_client);
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ntb_unregister_client_dev(KBUILD_MODNAME);
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pr_info("%s: Driver removed\n", KBUILD_MODNAME);
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}
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module_exit(ntb_netdev_exit_module);
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