linux/drivers/net/ethernet/sun/sunvnet.c
Shannon Nelson 98524e04e0 sunvnet: add support for IPv6 checksum offloads
The original code didn't handle non-IPv4 packets very well, so the
offload advertising had to be scaled back down to just IP.  Here we
add the bits needed to support TCP and UDP packets over IPv6 and
turn the offload advertising back on.

Orabug: 26289579

Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-16 16:36:01 -07:00

568 lines
13 KiB
C

/* sunvnet.c: Sun LDOM Virtual Network Driver.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
* Copyright (C) 2016-2017 Oracle. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/mutex.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#if IS_ENABLED(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>
#include "sunvnet_common.h"
/* length of time before we decide the hardware is borked,
* and dev->tx_timeout() should be called to fix the problem
*/
#define VNET_TX_TIMEOUT (5 * HZ)
#define DRV_MODULE_NAME "sunvnet"
#define DRV_MODULE_VERSION "2.0"
#define DRV_MODULE_RELDATE "February 3, 2017"
static char version[] =
DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
{ .major = 1, .minor = 8 },
{ .major = 1, .minor = 7 },
{ .major = 1, .minor = 6 },
{ .major = 1, .minor = 0 },
};
static void vnet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
}
static u32 vnet_get_msglevel(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return vp->msg_enable;
}
static void vnet_set_msglevel(struct net_device *dev, u32 value)
{
struct vnet *vp = netdev_priv(dev);
vp->msg_enable = value;
}
static const struct {
const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
{ "rx_packets" },
{ "tx_packets" },
{ "rx_bytes" },
{ "tx_bytes" },
{ "rx_errors" },
{ "tx_errors" },
{ "rx_dropped" },
{ "tx_dropped" },
{ "multicast" },
{ "rx_length_errors" },
{ "rx_frame_errors" },
{ "rx_missed_errors" },
{ "tx_carrier_errors" },
{ "nports" },
};
static int vnet_get_sset_count(struct net_device *dev, int sset)
{
struct vnet *vp = (struct vnet *)netdev_priv(dev);
switch (sset) {
case ETH_SS_STATS:
return ARRAY_SIZE(ethtool_stats_keys)
+ (NUM_VNET_PORT_STATS * vp->nports);
default:
return -EOPNOTSUPP;
}
}
static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
struct vnet *vp = (struct vnet *)netdev_priv(dev);
struct vnet_port *port;
char *p = (char *)buf;
switch (stringset) {
case ETH_SS_STATS:
memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
p += sizeof(ethtool_stats_keys);
rcu_read_lock();
list_for_each_entry_rcu(port, &vp->port_list, list) {
snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
port->q_index, port->switch_port ? "s" : "q",
port->raddr);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
port->q_index);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
port->q_index);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
port->q_index);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
port->q_index);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
port->q_index);
p += ETH_GSTRING_LEN;
snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
port->q_index);
p += ETH_GSTRING_LEN;
}
rcu_read_unlock();
break;
default:
WARN_ON(1);
break;
}
}
static void vnet_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *estats, u64 *data)
{
struct vnet *vp = (struct vnet *)netdev_priv(dev);
struct vnet_port *port;
int i = 0;
data[i++] = dev->stats.rx_packets;
data[i++] = dev->stats.tx_packets;
data[i++] = dev->stats.rx_bytes;
data[i++] = dev->stats.tx_bytes;
data[i++] = dev->stats.rx_errors;
data[i++] = dev->stats.tx_errors;
data[i++] = dev->stats.rx_dropped;
data[i++] = dev->stats.tx_dropped;
data[i++] = dev->stats.multicast;
data[i++] = dev->stats.rx_length_errors;
data[i++] = dev->stats.rx_frame_errors;
data[i++] = dev->stats.rx_missed_errors;
data[i++] = dev->stats.tx_carrier_errors;
data[i++] = vp->nports;
rcu_read_lock();
list_for_each_entry_rcu(port, &vp->port_list, list) {
data[i++] = port->q_index;
data[i++] = port->stats.rx_packets;
data[i++] = port->stats.tx_packets;
data[i++] = port->stats.rx_bytes;
data[i++] = port->stats.tx_bytes;
data[i++] = port->stats.event_up;
data[i++] = port->stats.event_reset;
}
rcu_read_unlock();
}
static const struct ethtool_ops vnet_ethtool_ops = {
.get_drvinfo = vnet_get_drvinfo,
.get_msglevel = vnet_get_msglevel,
.set_msglevel = vnet_set_msglevel,
.get_link = ethtool_op_get_link,
.get_sset_count = vnet_get_sset_count,
.get_strings = vnet_get_strings,
.get_ethtool_stats = vnet_get_ethtool_stats,
};
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
unsigned int hash = vnet_hashfn(skb->data);
struct hlist_head *hp = &vp->port_hash[hash];
struct vnet_port *port;
hlist_for_each_entry_rcu(port, hp, hash) {
if (!sunvnet_port_is_up_common(port))
continue;
if (ether_addr_equal(port->raddr, skb->data))
return port;
}
list_for_each_entry_rcu(port, &vp->port_list, list) {
if (!port->switch_port)
continue;
if (!sunvnet_port_is_up_common(port))
continue;
return port;
}
return NULL;
}
/* func arg to vnet_start_xmit_common() to get the proper tx port */
static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return __tx_port_find(vp, skb);
}
static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = __tx_port_find(vp, skb);
if (!port)
return 0;
return port->q_index;
}
/* Wrappers to common functions */
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
}
static void vnet_set_rx_mode(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return sunvnet_set_rx_mode_common(dev, vp);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void vnet_poll_controller(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return sunvnet_poll_controller_common(dev, vp);
}
#endif
static const struct net_device_ops vnet_ops = {
.ndo_open = sunvnet_open_common,
.ndo_stop = sunvnet_close_common,
.ndo_set_rx_mode = vnet_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 = vnet_start_xmit,
.ndo_select_queue = vnet_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = vnet_poll_controller,
#endif
};
static struct vnet *vnet_new(const u64 *local_mac,
struct vio_dev *vdev)
{
struct net_device *dev;
struct vnet *vp;
int err, i;
dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
if (!dev)
return ERR_PTR(-ENOMEM);
dev->needed_headroom = VNET_PACKET_SKIP + 8;
dev->needed_tailroom = 8;
for (i = 0; i < ETH_ALEN; i++)
dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
vp = netdev_priv(dev);
spin_lock_init(&vp->lock);
vp->dev = dev;
INIT_LIST_HEAD(&vp->port_list);
for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
INIT_HLIST_HEAD(&vp->port_hash[i]);
INIT_LIST_HEAD(&vp->list);
vp->local_mac = *local_mac;
dev->netdev_ops = &vnet_ops;
dev->ethtool_ops = &vnet_ethtool_ops;
dev->watchdog_timeo = VNET_TX_TIMEOUT;
dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
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);
err = register_netdev(dev);
if (err) {
pr_err("Cannot register net device, aborting\n");
goto err_out_free_dev;
}
netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
list_add(&vp->list, &vnet_list);
return vp;
err_out_free_dev:
free_netdev(dev);
return ERR_PTR(err);
}
static struct vnet *vnet_find_or_create(const u64 *local_mac,
struct vio_dev *vdev)
{
struct vnet *iter, *vp;
mutex_lock(&vnet_list_mutex);
vp = NULL;
list_for_each_entry(iter, &vnet_list, list) {
if (iter->local_mac == *local_mac) {
vp = iter;
break;
}
}
if (!vp)
vp = vnet_new(local_mac, vdev);
mutex_unlock(&vnet_list_mutex);
return vp;
}
static void vnet_cleanup(void)
{
struct vnet *vp;
struct net_device *dev;
mutex_lock(&vnet_list_mutex);
while (!list_empty(&vnet_list)) {
vp = list_first_entry(&vnet_list, struct vnet, list);
list_del(&vp->list);
dev = vp->dev;
/* vio_unregister_driver() should have cleaned up port_list */
BUG_ON(!list_empty(&vp->port_list));
unregister_netdev(dev);
free_netdev(dev);
}
mutex_unlock(&vnet_list_mutex);
}
static const char *local_mac_prop = "local-mac-address";
static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
u64 port_node,
struct vio_dev *vdev)
{
const u64 *local_mac = NULL;
u64 a;
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, "network"))
continue;
local_mac = mdesc_get_property(hp, target,
local_mac_prop, NULL);
if (local_mac)
break;
}
if (!local_mac)
return ERR_PTR(-ENODEV);
return vnet_find_or_create(local_mac, vdev);
}
static struct ldc_channel_config vnet_ldc_cfg = {
.event = sunvnet_event_common,
.mtu = 64,
.mode = LDC_MODE_UNRELIABLE,
};
static struct vio_driver_ops vnet_vio_ops = {
.send_attr = sunvnet_send_attr_common,
.handle_attr = sunvnet_handle_attr_common,
.handshake_complete = sunvnet_handshake_complete_common,
};
const char *remote_macaddr_prop = "remote-mac-address";
static int vnet_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;
const u64 *rmac;
int len, i, err, switch_port;
hp = mdesc_grab();
vp = vnet_find_parent(hp, vdev->mp, vdev);
if (IS_ERR(vp)) {
pr_err("Cannot find port parent vnet\n");
err = PTR_ERR(vp);
goto err_out_put_mdesc;
}
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);
goto err_out_put_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
err = -ENOMEM;
if (!port)
goto err_out_put_mdesc;
for (i = 0; i < ETH_ALEN; i++)
port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
port->vp = vp;
err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
vnet_versions, ARRAY_SIZE(vnet_versions),
&vnet_vio_ops, vp->dev->name);
if (err)
goto err_out_free_port;
err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
if (err)
goto err_out_free_port;
netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
NAPI_POLL_WEIGHT);
INIT_HLIST_NODE(&port->hash);
INIT_LIST_HEAD(&port->list);
switch_port = 0;
if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
switch_port = 1;
port->switch_port = switch_port;
port->tso = true;
port->tsolen = 0;
spin_lock_irqsave(&vp->lock, flags);
if (switch_port)
list_add_rcu(&port->list, &vp->port_list);
else
list_add_tail_rcu(&port->list, &vp->port_list);
hlist_add_head_rcu(&port->hash,
&vp->port_hash[vnet_hashfn(port->raddr)]);
sunvnet_port_add_txq_common(port);
spin_unlock_irqrestore(&vp->lock, flags);
dev_set_drvdata(&vdev->dev, port);
pr_info("%s: PORT ( remote-mac %pM%s )\n",
vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
(unsigned long)port);
napi_enable(&port->napi);
vio_port_up(&port->vio);
mdesc_release(hp);
return 0;
err_out_free_port:
kfree(port);
err_out_put_mdesc:
mdesc_release(hp);
return err;
}
static int vnet_port_remove(struct vio_dev *vdev)
{
struct vnet_port *port = dev_get_drvdata(&vdev->dev);
if (port) {
del_timer_sync(&port->vio.timer);
napi_disable(&port->napi);
list_del_rcu(&port->list);
hlist_del_rcu(&port->hash);
synchronize_rcu();
del_timer_sync(&port->clean_timer);
sunvnet_port_rm_txq_common(port);
netif_napi_del(&port->napi);
sunvnet_port_free_tx_bufs_common(port);
vio_ldc_free(&port->vio);
dev_set_drvdata(&vdev->dev, NULL);
kfree(port);
}
return 0;
}
static const struct vio_device_id vnet_port_match[] = {
{
.type = "vnet-port",
},
{},
};
MODULE_DEVICE_TABLE(vio, vnet_port_match);
static struct vio_driver vnet_port_driver = {
.id_table = vnet_port_match,
.probe = vnet_port_probe,
.remove = vnet_port_remove,
.name = "vnet_port",
};
static int __init vnet_init(void)
{
pr_info("%s\n", version);
return vio_register_driver(&vnet_port_driver);
}
static void __exit vnet_exit(void)
{
vio_unregister_driver(&vnet_port_driver);
vnet_cleanup();
}
module_init(vnet_init);
module_exit(vnet_exit);