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Commit 548c237c authored by Jon Mason's avatar Jon Mason Committed by Greg Kroah-Hartman
Browse files

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: default avatarJon Mason <jon.mason@intel.com>
Reviewed-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fce8a7bb

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -5398,6 +5398,7 @@ NTB DRIVER 
M:	Jon Mason <jon.mason@intel.com>

S:	Supported

F:	drivers/ntb/

F:	drivers/net/ntb_netdev.c

F:	include/linux/ntb.h



NTFS FILESYSTEM

drivers/net/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -189,6 +189,10 @@ config NETPOLL_TRAP 
config NET_POLL_CONTROLLER

	def_bool NETPOLL



config NTB_NETDEV

	tristate "Virtual Ethernet over NTB"

	depends on NTB



config RIONET

	tristate "RapidIO Ethernet over messaging driver support"

	depends on RAPIDIO

drivers/net/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -71,3 +71,4 @@ obj-$(CONFIG_USB_IPHETH) += usb/ 
obj-$(CONFIG_USB_CDC_PHONET)   += usb/



obj-$(CONFIG_HYPERV_NET) += hyperv/

obj-$(CONFIG_NTB_NETDEV) += ntb_netdev.o

drivers/net/ntb_netdev.c

0 → 100644
+419 −0
Original line number Diff line number Diff line 
/*

 * 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	"0.6"



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) {

		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);



	if (netif_queue_stopped(ndev))

		netif_wake_queue(ndev);

}



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, "ntb_transport_tx_enqueue\n");



	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++;

	netif_stop_queue(ndev);

	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 void ntb_netdev_tx_timeout(struct net_device *ndev)

{

	if (netif_running(ndev))

		netif_wake_queue(ndev);

}



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_tx_timeout = ntb_netdev_tx_timeout,

	.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 __devinit 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);

	pr_info("%s: %s created\n", KBUILD_MODNAME, ndev->name);

	return 0;



err1:

	ntb_transport_free_queue(dev->qp);

err:

	free_netdev(ndev);

	return rc;

}



static void __exit 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);

	pr_info("%s: Driver removed\n", KBUILD_MODNAME);

}

module_exit(ntb_netdev_exit_module);