blob: a9a6670b5ff1f5f7c7701c07d40cc37dcbe28d38 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
*
* Copyright (C) 2016-2017 Oracle. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/types.h>
#if defined(CONFIG_IPV6)
#include <linux/icmpv6.h>
#endif
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <asm/vio.h>
#include <asm/ldc.h>
/* This driver makes use of the common code in sunvnet_common.c */
#include "sunvnet_common.h"
/* Length of time before we decide the hardware is hung,
* and dev->tx_timeout() should be called to fix the problem.
*/
#define VSW_TX_TIMEOUT (10 * HZ)
/* Static HW Addr used for the network interfaces representing vsw ports */
static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
#define DRV_MODULE_NAME "ldmvsw"
#define DRV_MODULE_VERSION "1.2"
#define DRV_MODULE_RELDATE "March 4, 2017"
static char version[] =
DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
MODULE_AUTHOR("Oracle");
MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
/* Ordered from largest major to lowest */
static struct vio_version vsw_versions[] = {
{ .major = 1, .minor = 8 },
{ .major = 1, .minor = 7 },
{ .major = 1, .minor = 6 },
{ .major = 1, .minor = 0 },
};
static void vsw_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
strscpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
}
static u32 vsw_get_msglevel(struct net_device *dev)
{
struct vnet_port *port = netdev_priv(dev);
return port->vp->msg_enable;
}
static void vsw_set_msglevel(struct net_device *dev, u32 value)
{
struct vnet_port *port = netdev_priv(dev);
port->vp->msg_enable = value;
}
static const struct ethtool_ops vsw_ethtool_ops = {
.get_drvinfo = vsw_get_drvinfo,
.get_msglevel = vsw_get_msglevel,
.set_msglevel = vsw_set_msglevel,
.get_link = ethtool_op_get_link,
};
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
/* func arg to vnet_start_xmit_common() to get the proper tx port */
static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
struct net_device *dev)
{
struct vnet_port *port = netdev_priv(dev);
return port;
}
static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
struct net_device *sb_dev)
{
struct vnet_port *port = netdev_priv(dev);
if (!port)
return 0;
return port->q_index;
}
/* Wrappers to common functions */
static netdev_tx_t vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
}
static void vsw_set_rx_mode(struct net_device *dev)
{
struct vnet_port *port = netdev_priv(dev);
return sunvnet_set_rx_mode_common(dev, port->vp);
}
static int ldmvsw_open(struct net_device *dev)
{
struct vnet_port *port = netdev_priv(dev);
struct vio_driver_state *vio = &port->vio;
/* reset the channel */
vio_link_state_change(vio, LDC_EVENT_RESET);
vnet_port_reset(port);
vio_port_up(vio);
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void vsw_poll_controller(struct net_device *dev)
{
struct vnet_port *port = netdev_priv(dev);
return sunvnet_poll_controller_common(dev, port->vp);
}
#endif
static const struct net_device_ops vsw_ops = {
.ndo_open = ldmvsw_open,
.ndo_stop = sunvnet_close_common,
.ndo_set_rx_mode = vsw_set_rx_mode,
.ndo_set_mac_address = sunvnet_set_mac_addr_common,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = sunvnet_tx_timeout_common,
.ndo_start_xmit = vsw_start_xmit,
.ndo_select_queue = vsw_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = vsw_poll_controller,
#endif
};
static const char *local_mac_prop = "local-mac-address";
static const char *cfg_handle_prop = "cfg-handle";
static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
u64 port_node,
u64 *handle)
{
struct vnet *vp;
struct vnet *iter;
const u64 *local_mac = NULL;
const u64 *cfghandle = NULL;
u64 a;
/* Get the parent virtual-network-switch macaddr and cfghandle */
mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
u64 target = mdesc_arc_target(hp, a);
const char *name;
name = mdesc_get_property(hp, target, "name", NULL);
if (!name || strcmp(name, "virtual-network-switch"))
continue;
local_mac = mdesc_get_property(hp, target,
local_mac_prop, NULL);
cfghandle = mdesc_get_property(hp, target,
cfg_handle_prop, NULL);
break;
}
if (!local_mac || !cfghandle)
return ERR_PTR(-ENODEV);
/* find or create associated vnet */
vp = NULL;
mutex_lock(&vnet_list_mutex);
list_for_each_entry(iter, &vnet_list, list) {
if (iter->local_mac == *local_mac) {
vp = iter;
break;
}
}
if (!vp) {
vp = kzalloc(sizeof(*vp), GFP_KERNEL);
if (unlikely(!vp)) {
mutex_unlock(&vnet_list_mutex);
return ERR_PTR(-ENOMEM);
}
spin_lock_init(&vp->lock);
INIT_LIST_HEAD(&vp->port_list);
INIT_LIST_HEAD(&vp->list);
vp->local_mac = *local_mac;
list_add(&vp->list, &vnet_list);
}
mutex_unlock(&vnet_list_mutex);
*handle = (u64)*cfghandle;
return vp;
}
static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
struct vio_dev *vdev,
u64 handle,
u64 port_id)
{
struct net_device *dev;
struct vnet_port *port;
dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
if (!dev)
return ERR_PTR(-ENOMEM);
dev->needed_headroom = VNET_PACKET_SKIP + 8;
dev->needed_tailroom = 8;
eth_hw_addr_set(dev, hwaddr);
ether_addr_copy(dev->perm_addr, dev->dev_addr);
sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
dev->netdev_ops = &vsw_ops;
dev->ethtool_ops = &vsw_ethtool_ops;
dev->watchdog_timeo = VSW_TX_TIMEOUT;
dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
dev->features = dev->hw_features;
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = VNET_MAX_MTU;
SET_NETDEV_DEV(dev, &vdev->dev);
return dev;
}
static struct ldc_channel_config vsw_ldc_cfg = {
.event = sunvnet_event_common,
.mtu = 64,
.mode = LDC_MODE_UNRELIABLE,
};
static struct vio_driver_ops vsw_vio_ops = {
.send_attr = sunvnet_send_attr_common,
.handle_attr = sunvnet_handle_attr_common,
.handshake_complete = sunvnet_handshake_complete_common,
};
static const char *remote_macaddr_prop = "remote-mac-address";
static const char *id_prop = "id";
static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct mdesc_handle *hp;
struct vnet_port *port;
unsigned long flags;
struct vnet *vp;
struct net_device *dev;
const u64 *rmac;
int len, i, err;
const u64 *port_id;
u64 handle;
hp = mdesc_grab();
if (!hp)
return -ENODEV;
rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
err = -ENODEV;
if (!rmac) {
pr_err("Port lacks %s property\n", remote_macaddr_prop);
mdesc_release(hp);
return err;
}
port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
err = -ENODEV;
if (!port_id) {
pr_err("Port lacks %s property\n", id_prop);
mdesc_release(hp);
return err;
}
/* Get (or create) the vnet associated with this port */
vp = vsw_get_vnet(hp, vdev->mp, &handle);
if (IS_ERR(vp)) {
err = PTR_ERR(vp);
pr_err("Failed to get vnet for vsw-port\n");
mdesc_release(hp);
return err;
}
mdesc_release(hp);
dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
if (IS_ERR(dev)) {
err = PTR_ERR(dev);
pr_err("Failed to alloc netdev for vsw-port\n");
return err;
}
port = netdev_priv(dev);
INIT_LIST_HEAD(&port->list);
for (i = 0; i < ETH_ALEN; i++)
port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
port->vp = vp;
port->dev = dev;
port->switch_port = 1;
port->tso = false; /* no tso in vsw, misbehaves in bridge */
port->tsolen = 0;
/* Mark the port as belonging to ldmvsw which directs the
* common code to use the net_device in the vnet_port
* rather than the net_device in the vnet (which is used
* by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
* macro.
*/
port->vsw = 1;
err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
vsw_versions, ARRAY_SIZE(vsw_versions),
&vsw_vio_ops, dev->name);
if (err)
goto err_out_free_dev;
err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
if (err)
goto err_out_free_dev;
dev_set_drvdata(&vdev->dev, port);
netif_napi_add(dev, &port->napi, sunvnet_poll_common);
spin_lock_irqsave(&vp->lock, flags);
list_add_rcu(&port->list, &vp->port_list);
spin_unlock_irqrestore(&vp->lock, flags);
timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
err = register_netdev(dev);
if (err) {
pr_err("Cannot register net device, aborting\n");
goto err_out_del_timer;
}
spin_lock_irqsave(&vp->lock, flags);
sunvnet_port_add_txq_common(port);
spin_unlock_irqrestore(&vp->lock, flags);
napi_enable(&port->napi);
vio_port_up(&port->vio);
/* assure no carrier until we receive an LDC_EVENT_UP,
* even if the vsw config script tries to force us up
*/
netif_carrier_off(dev);
netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
port->raddr, " switch-port");
return 0;
err_out_del_timer:
del_timer_sync(&port->clean_timer);
list_del_rcu(&port->list);
synchronize_rcu();
netif_napi_del(&port->napi);
dev_set_drvdata(&vdev->dev, NULL);
vio_ldc_free(&port->vio);
err_out_free_dev:
free_netdev(dev);
return err;
}
static void vsw_port_remove(struct vio_dev *vdev)
{
struct vnet_port *port = dev_get_drvdata(&vdev->dev);
unsigned long flags;
if (port) {
del_timer_sync(&port->vio.timer);
del_timer_sync(&port->clean_timer);
napi_disable(&port->napi);
unregister_netdev(port->dev);
list_del_rcu(&port->list);
synchronize_rcu();
spin_lock_irqsave(&port->vp->lock, flags);
sunvnet_port_rm_txq_common(port);
spin_unlock_irqrestore(&port->vp->lock, flags);
netif_napi_del(&port->napi);
sunvnet_port_free_tx_bufs_common(port);
vio_ldc_free(&port->vio);
dev_set_drvdata(&vdev->dev, NULL);
free_netdev(port->dev);
}
}
static void vsw_cleanup(void)
{
struct vnet *vp;
/* just need to free up the vnet list */
mutex_lock(&vnet_list_mutex);
while (!list_empty(&vnet_list)) {
vp = list_first_entry(&vnet_list, struct vnet, list);
list_del(&vp->list);
/* vio_unregister_driver() should have cleaned up port_list */
if (!list_empty(&vp->port_list))
pr_err("Ports not removed by VIO subsystem!\n");
kfree(vp);
}
mutex_unlock(&vnet_list_mutex);
}
static const struct vio_device_id vsw_port_match[] = {
{
.type = "vsw-port",
},
{},
};
MODULE_DEVICE_TABLE(vio, vsw_port_match);
static struct vio_driver vsw_port_driver = {
.id_table = vsw_port_match,
.probe = vsw_port_probe,
.remove = vsw_port_remove,
.name = "vsw_port",
};
static int __init vsw_init(void)
{
pr_info("%s\n", version);
return vio_register_driver(&vsw_port_driver);
}
static void __exit vsw_exit(void)
{
vio_unregister_driver(&vsw_port_driver);
vsw_cleanup();
}
module_init(vsw_init);
module_exit(vsw_exit);