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linux/drivers/net/rionet.c

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/*
* rionet - Ethernet driver over RapidIO messaging services
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/slab.h>
#include <linux/rio_ids.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>
#include <linux/reboot.h>
#define DRV_NAME "rionet"
#define DRV_VERSION "0.3"
#define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
#define DRV_DESC "Ethernet over RapidIO"
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");
#define RIONET_DEFAULT_MSGLEVEL \
(NETIF_MSG_DRV | \
NETIF_MSG_LINK | \
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
#define RIONET_DOORBELL_JOIN 0x1000
#define RIONET_DOORBELL_LEAVE 0x1001
#define RIONET_MAILBOX 0
#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
#define RIONET_MAX_NETS 8
#define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
#define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
struct rionet_private {
struct rio_mport *mport;
struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
int rx_slot;
int tx_slot;
int tx_cnt;
int ack_slot;
spinlock_t lock;
spinlock_t tx_lock;
u32 msg_enable;
bool open;
};
struct rionet_peer {
struct list_head node;
struct rio_dev *rdev;
struct resource *res;
};
struct rionet_net {
struct net_device *ndev;
struct list_head peers;
spinlock_t lock; /* net info access lock */
struct rio_dev **active;
int nact; /* number of active peers */
};
static struct rionet_net nets[RIONET_MAX_NETS];
#define is_rionet_capable(src_ops, dst_ops) \
((src_ops & RIO_SRC_OPS_DATA_MSG) && \
(dst_ops & RIO_DST_OPS_DATA_MSG) && \
(src_ops & RIO_SRC_OPS_DOORBELL) && \
(dst_ops & RIO_DST_OPS_DOORBELL))
#define dev_rionet_capable(dev) \
is_rionet_capable(dev->src_ops, dev->dst_ops)
#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
#define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
static int rionet_rx_clean(struct net_device *ndev)
{
int i;
int error = 0;
struct rionet_private *rnet = netdev_priv(ndev);
void *data;
i = rnet->rx_slot;
do {
if (!rnet->rx_skb[i])
continue;
if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
break;
rnet->rx_skb[i]->data = data;
skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
rnet->rx_skb[i]->protocol =
eth_type_trans(rnet->rx_skb[i], ndev);
error = netif_rx(rnet->rx_skb[i]);
if (error == NET_RX_DROP) {
ndev->stats.rx_dropped++;
} else {
ndev->stats.rx_packets++;
ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
}
} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
return i;
}
static void rionet_rx_fill(struct net_device *ndev, int end)
{
int i;
struct rionet_private *rnet = netdev_priv(ndev);
i = rnet->rx_slot;
do {
rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
if (!rnet->rx_skb[i])
break;
rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
rnet->rx_skb[i]->data);
} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
rnet->rx_slot = i;
}
static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
struct rio_dev *rdev)
{
struct rionet_private *rnet = netdev_priv(ndev);
rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
rnet->tx_skb[rnet->tx_slot] = skb;
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += skb->len;
if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
netif_stop_queue(ndev);
++rnet->tx_slot;
rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
if (netif_msg_tx_queued(rnet))
printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
skb->len);
return 0;
}
static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
int i;
struct rionet_private *rnet = netdev_priv(ndev);
struct ethhdr *eth = (struct ethhdr *)skb->data;
u16 destid;
unsigned long flags;
int add_num = 1;
spin_lock_irqsave(&rnet->tx_lock, flags);
if (is_multicast_ether_addr(eth->h_dest))
add_num = nets[rnet->mport->id].nact;
if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
netif_stop_queue(ndev);
spin_unlock_irqrestore(&rnet->tx_lock, flags);
printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
ndev->name);
return NETDEV_TX_BUSY;
}
if (is_multicast_ether_addr(eth->h_dest)) {
int count = 0;
for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
i++)
if (nets[rnet->mport->id].active[i]) {
rionet_queue_tx_msg(skb, ndev,
nets[rnet->mport->id].active[i]);
if (count)
atomic_inc(&skb->users);
count++;
}
} else if (RIONET_MAC_MATCH(eth->h_dest)) {
destid = RIONET_GET_DESTID(eth->h_dest);
if (nets[rnet->mport->id].active[destid])
rionet_queue_tx_msg(skb, ndev,
nets[rnet->mport->id].active[destid]);
else {
/*
* If the target device was removed from the list of
* active peers but we still have TX packets targeting
* it just report sending a packet to the target
* (without actual packet transfer).
*/
dev_kfree_skb_any(skb);
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += skb->len;
}
}
spin_unlock_irqrestore(&rnet->tx_lock, flags);
return NETDEV_TX_OK;
}
static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
u16 info)
{
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
struct rionet_peer *peer;
unsigned char netid = rnet->mport->id;
if (netif_msg_intr(rnet))
printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
DRV_NAME, sid, tid, info);
if (info == RIONET_DOORBELL_JOIN) {
if (!nets[netid].active[sid]) {
spin_lock(&nets[netid].lock);
list_for_each_entry(peer, &nets[netid].peers, node) {
if (peer->rdev->destid == sid) {
nets[netid].active[sid] = peer->rdev;
nets[netid].nact++;
}
}
spin_unlock(&nets[netid].lock);
rio_mport_send_doorbell(mport, sid,
RIONET_DOORBELL_JOIN);
}
} else if (info == RIONET_DOORBELL_LEAVE) {
spin_lock(&nets[netid].lock);
if (nets[netid].active[sid]) {
nets[netid].active[sid] = NULL;
nets[netid].nact--;
}
spin_unlock(&nets[netid].lock);
} else {
if (netif_msg_intr(rnet))
printk(KERN_WARNING "%s: unhandled doorbell\n",
DRV_NAME);
}
}
static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
{
int n;
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
if (netif_msg_intr(rnet))
printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
DRV_NAME, mbox, slot);
spin_lock(&rnet->lock);
if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
rionet_rx_fill(ndev, n);
spin_unlock(&rnet->lock);
}
static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
{
struct net_device *ndev = dev_id;
struct rionet_private *rnet = netdev_priv(ndev);
spin_lock(&rnet->tx_lock);
if (netif_msg_intr(rnet))
printk(KERN_INFO
"%s: outbound message event, mbox %d slot %d\n",
DRV_NAME, mbox, slot);
while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
/* dma unmap single */
dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
rnet->tx_skb[rnet->ack_slot] = NULL;
++rnet->ack_slot;
rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
rnet->tx_cnt--;
}
if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
netif_wake_queue(ndev);
spin_unlock(&rnet->tx_lock);
}
static int rionet_open(struct net_device *ndev)
{
int i, rc = 0;
struct rionet_peer *peer;
struct rionet_private *rnet = netdev_priv(ndev);
unsigned char netid = rnet->mport->id;
unsigned long flags;
if (netif_msg_ifup(rnet))
printk(KERN_INFO "%s: open\n", DRV_NAME);
if ((rc = rio_request_inb_dbell(rnet->mport,
(void *)ndev,
RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE,
rionet_dbell_event)) < 0)
goto out;
if ((rc = rio_request_inb_mbox(rnet->mport,
(void *)ndev,
RIONET_MAILBOX,
RIONET_RX_RING_SIZE,
rionet_inb_msg_event)) < 0)
goto out;
if ((rc = rio_request_outb_mbox(rnet->mport,
(void *)ndev,
RIONET_MAILBOX,
RIONET_TX_RING_SIZE,
rionet_outb_msg_event)) < 0)
goto out;
/* Initialize inbound message ring */
for (i = 0; i < RIONET_RX_RING_SIZE; i++)
rnet->rx_skb[i] = NULL;
rnet->rx_slot = 0;
rionet_rx_fill(ndev, 0);
rnet->tx_slot = 0;
rnet->tx_cnt = 0;
rnet->ack_slot = 0;
netif_carrier_on(ndev);
netif_start_queue(ndev);
spin_lock_irqsave(&nets[netid].lock, flags);
list_for_each_entry(peer, &nets[netid].peers, node) {
/* Send a join message */
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
spin_unlock_irqrestore(&nets[netid].lock, flags);
rnet->open = true;
out:
return rc;
}
static int rionet_close(struct net_device *ndev)
{
struct rionet_private *rnet = netdev_priv(ndev);
struct rionet_peer *peer;
unsigned char netid = rnet->mport->id;
unsigned long flags;
int i;
if (netif_msg_ifup(rnet))
printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
netif_stop_queue(ndev);
netif_carrier_off(ndev);
rnet->open = false;
for (i = 0; i < RIONET_RX_RING_SIZE; i++)
kfree_skb(rnet->rx_skb[i]);
spin_lock_irqsave(&nets[netid].lock, flags);
list_for_each_entry(peer, &nets[netid].peers, node) {
if (nets[netid].active[peer->rdev->destid]) {
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
nets[netid].active[peer->rdev->destid] = NULL;
}
if (peer->res)
rio_release_outb_dbell(peer->rdev, peer->res);
}
spin_unlock_irqrestore(&nets[netid].lock, flags);
rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE);
rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
return 0;
}
static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
{
struct rio_dev *rdev = to_rio_dev(dev);
unsigned char netid = rdev->net->hport->id;
struct rionet_peer *peer;
int state, found = 0;
unsigned long flags;
if (!dev_rionet_capable(rdev))
return;
spin_lock_irqsave(&nets[netid].lock, flags);
list_for_each_entry(peer, &nets[netid].peers, node) {
if (peer->rdev == rdev) {
list_del(&peer->node);
if (nets[netid].active[rdev->destid]) {
state = atomic_read(&rdev->state);
if (state != RIO_DEVICE_GONE &&
state != RIO_DEVICE_INITIALIZING) {
rio_send_doorbell(rdev,
RIONET_DOORBELL_LEAVE);
}
nets[netid].active[rdev->destid] = NULL;
nets[netid].nact--;
}
found = 1;
break;
}
}
spin_unlock_irqrestore(&nets[netid].lock, flags);
if (found) {
if (peer->res)
rio_release_outb_dbell(rdev, peer->res);
kfree(peer);
}
}
static void rionet_get_drvinfo(struct net_device *ndev,
struct ethtool_drvinfo *info)
{
struct rionet_private *rnet = netdev_priv(ndev);
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
}
static u32 rionet_get_msglevel(struct net_device *ndev)
{
struct rionet_private *rnet = netdev_priv(ndev);
return rnet->msg_enable;
}
static void rionet_set_msglevel(struct net_device *ndev, u32 value)
{
struct rionet_private *rnet = netdev_priv(ndev);
rnet->msg_enable = value;
}
static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
{
if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
printk(KERN_ERR "%s: Invalid MTU size %d\n",
ndev->name, new_mtu);
return -EINVAL;
}
ndev->mtu = new_mtu;
return 0;
}
static const struct ethtool_ops rionet_ethtool_ops = {
.get_drvinfo = rionet_get_drvinfo,
.get_msglevel = rionet_get_msglevel,
.set_msglevel = rionet_set_msglevel,
.get_link = ethtool_op_get_link,
};
static const struct net_device_ops rionet_netdev_ops = {
.ndo_open = rionet_open,
.ndo_stop = rionet_close,
.ndo_start_xmit = rionet_start_xmit,
.ndo_change_mtu = rionet_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
{
int rc = 0;
struct rionet_private *rnet;
u16 device_id;
const size_t rionet_active_bytes = sizeof(void *) *
RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
get_order(rionet_active_bytes));
if (!nets[mport->id].active) {
rc = -ENOMEM;
goto out;
}
memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
/* Set up private area */
rnet = netdev_priv(ndev);
rnet->mport = mport;
rnet->open = false;
/* Set the default MAC address */
device_id = rio_local_get_device_id(mport);
ndev->dev_addr[0] = 0x00;
ndev->dev_addr[1] = 0x01;
ndev->dev_addr[2] = 0x00;
ndev->dev_addr[3] = 0x01;
ndev->dev_addr[4] = device_id >> 8;
ndev->dev_addr[5] = device_id & 0xff;
ndev->netdev_ops = &rionet_netdev_ops;
ndev->mtu = RIONET_MAX_MTU;
ndev->features = NETIF_F_LLTX;
SET_NETDEV_DEV(ndev, &mport->dev);
ndev->ethtool_ops = &rionet_ethtool_ops;
spin_lock_init(&rnet->lock);
spin_lock_init(&rnet->tx_lock);
rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
rc = register_netdev(ndev);
if (rc != 0) {
free_pages((unsigned long)nets[mport->id].active,
get_order(rionet_active_bytes));
goto out;
}
printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
ndev->name,
DRV_NAME,
DRV_DESC,
DRV_VERSION,
ndev->dev_addr,
mport->name);
out:
return rc;
}
static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
{
int rc = -ENODEV;
u32 lsrc_ops, ldst_ops;
struct rionet_peer *peer;
struct net_device *ndev = NULL;
struct rio_dev *rdev = to_rio_dev(dev);
unsigned char netid = rdev->net->hport->id;
if (netid >= RIONET_MAX_NETS)
return rc;
/*
* If first time through this net, make sure local device is rionet
* capable and setup netdev (this step will be skipped in later probes
* on the same net).
*/
if (!nets[netid].ndev) {
rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
&lsrc_ops);
rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
&ldst_ops);
if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
printk(KERN_ERR
"%s: local device %s is not network capable\n",
DRV_NAME, rdev->net->hport->name);
goto out;
}
/* Allocate our net_device structure */
ndev = alloc_etherdev(sizeof(struct rionet_private));
if (ndev == NULL) {
rc = -ENOMEM;
goto out;
}
rc = rionet_setup_netdev(rdev->net->hport, ndev);
if (rc) {
printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
DRV_NAME, rc);
free_netdev(ndev);
goto out;
}
INIT_LIST_HEAD(&nets[netid].peers);
spin_lock_init(&nets[netid].lock);
nets[netid].nact = 0;
nets[netid].ndev = ndev;
}
/*
* If the remote device has mailbox/doorbell capabilities,
* add it to the peer list.
*/
if (dev_rionet_capable(rdev)) {
struct rionet_private *rnet;
unsigned long flags;
rnet = netdev_priv(nets[netid].ndev);
peer = kzalloc(sizeof(*peer), GFP_KERNEL);
if (!peer) {
rc = -ENOMEM;
goto out;
}
peer->rdev = rdev;
peer->res = rio_request_outb_dbell(peer->rdev,
RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE);
if (!peer->res) {
pr_err("%s: error requesting doorbells\n", DRV_NAME);
kfree(peer);
rc = -ENOMEM;
goto out;
}
spin_lock_irqsave(&nets[netid].lock, flags);
list_add_tail(&peer->node, &nets[netid].peers);
spin_unlock_irqrestore(&nets[netid].lock, flags);
pr_debug("%s: %s add peer %s\n",
DRV_NAME, __func__, rio_name(rdev));
/* If netdev is already opened, send join request to new peer */
if (rnet->open)
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
return 0;
out:
return rc;
}
static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
void *unused)
{
struct rionet_peer *peer;
unsigned long flags;
int i;
pr_debug("%s: %s\n", DRV_NAME, __func__);
for (i = 0; i < RIONET_MAX_NETS; i++) {
if (!nets[i].ndev)
continue;
spin_lock_irqsave(&nets[i].lock, flags);
list_for_each_entry(peer, &nets[i].peers, node) {
if (nets[i].active[peer->rdev->destid]) {
rio_send_doorbell(peer->rdev,
RIONET_DOORBELL_LEAVE);
nets[i].active[peer->rdev->destid] = NULL;
}
}
spin_unlock_irqrestore(&nets[i].lock, flags);
}
return NOTIFY_DONE;
}
static void rionet_remove_mport(struct device *dev,
struct class_interface *class_intf)
{
struct rio_mport *mport = to_rio_mport(dev);
struct net_device *ndev;
int id = mport->id;
pr_debug("%s %s\n", __func__, mport->name);
WARN(nets[id].nact, "%s called when connected to %d peers\n",
__func__, nets[id].nact);
WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
__func__);
if (nets[id].ndev) {
ndev = nets[id].ndev;
netif_stop_queue(ndev);
unregister_netdev(ndev);
free_pages((unsigned long)nets[id].active,
get_order(sizeof(void *) *
RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
nets[id].active = NULL;
free_netdev(ndev);
nets[id].ndev = NULL;
}
}
#ifdef MODULE
static struct rio_device_id rionet_id_table[] = {
{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
{ 0, } /* terminate list */
};
MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
#endif
static struct subsys_interface rionet_interface = {
.name = "rionet",
.subsys = &rio_bus_type,
.add_dev = rionet_add_dev,
.remove_dev = rionet_remove_dev,
};
static struct notifier_block rionet_notifier = {
.notifier_call = rionet_shutdown,
};
/* the rio_mport_interface is used to handle local mport devices */
static struct class_interface rio_mport_interface __refdata = {
.class = &rio_mport_class,
.add_dev = NULL,
.remove_dev = rionet_remove_mport,
};
static int __init rionet_init(void)
{
int ret;
ret = register_reboot_notifier(&rionet_notifier);
if (ret) {
pr_err("%s: failed to register reboot notifier (err=%d)\n",
DRV_NAME, ret);
return ret;
}
ret = class_interface_register(&rio_mport_interface);
if (ret) {
pr_err("%s: class_interface_register error: %d\n",
DRV_NAME, ret);
return ret;
}
return subsys_interface_register(&rionet_interface);
}
static void __exit rionet_exit(void)
{
unregister_reboot_notifier(&rionet_notifier);
subsys_interface_unregister(&rionet_interface);
class_interface_unregister(&rio_mport_interface);
}
late_initcall(rionet_init);
module_exit(rionet_exit);
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