/*
* 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/rio_ids.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <linux/ethtool.h>
#define DRV_NAME "rionet"
#define DRV_VERSION "0.2"
#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
static LIST_HEAD(rionet_peers);
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;
};
struct rionet_peer {
struct list_head node;
struct rio_dev *rdev;
struct resource *res;
};
static int rionet_check = 0;
static int rionet_capable = 1;
/*
* This is a fast lookup table for translating TX
* Ethernet packets into a destination RIO device. It
* could be made into a hash table to save memory depending
* on system trade-offs.
*/
static struct rio_dev **rionet_active;
#define is_rionet_capable(pef, src_ops, dst_ops) \
((pef & RIO_PEF_INB_MBOX) && \
(pef & RIO_PEF_INB_DOORBELL) && \
(src_ops & RIO_SRC_OPS_DOORBELL) && \
(dst_ops & RIO_DST_OPS_DOORBELL))
#define dev_rionet_capable(dev) \
is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
#define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
#define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))
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 %8.8x len %8.8x\n", DRV_NAME,
(u32) skb, 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;
local_irq_save(flags);
if (!spin_trylock(&rnet->tx_lock)) {
local_irq_restore(flags);
return NETDEV_TX_LOCKED;
}
if ((rnet->tx_cnt + 1) > 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 (eth->h_dest[0] & 0x01) {
for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
i++)
if (rionet_active[i])
rionet_queue_tx_msg(skb, ndev,
rionet_active[i]);
} else if (RIONET_MAC_MATCH(eth->h_dest)) {
destid = RIONET_GET_DESTID(eth->h_dest);
if (rionet_active[destid])
rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
}
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;
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 (!rionet_active[sid]) {
list_for_each_entry(peer, &rionet_peers, node) {
if (peer->rdev->destid == sid)
rionet_active[sid] = peer->rdev;
}
rio_mport_send_doorbell(mport, sid,
RIONET_DOORBELL_JOIN);
}
} else if (info == RIONET_DOORBELL_LEAVE) {
rionet_active[sid] = NULL;
} 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->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->lock);
}
static int rionet_open(struct net_device *ndev)
{
int i, rc = 0;
struct rionet_peer *peer, *tmp;
u32 pwdcsr;
struct rionet_private *rnet = netdev_priv(ndev);
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);
list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
if (!(peer->res = rio_request_outb_dbell(peer->rdev,
RIONET_DOORBELL_JOIN,
RIONET_DOORBELL_LEAVE)))
{
printk(KERN_ERR "%s: error requesting doorbells\n",
DRV_NAME);
continue;
}
/*
* If device has initialized inbound doorbells,
* send a join message
*/
rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
if (pwdcsr & RIO_DOORBELL_AVAIL)
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
}
out:
return rc;
}
static int rionet_close(struct net_device *ndev)
{
struct rionet_private *rnet = netdev_priv(ndev);
struct rionet_peer *peer, *tmp;
int i;
if (netif_msg_ifup(rnet))
printk(KERN_INFO "%s: close\n", DRV_NAME);
netif_stop_queue(ndev);
netif_carrier_off(ndev);
for (i = 0; i < RIONET_RX_RING_SIZE; i++)
kfree_skb(rnet->rx_skb[i]);
list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
if (rionet_active[peer->rdev->destid]) {
rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
rionet_active[peer->rdev->destid] = NULL;
}
rio_release_outb_dbell(peer->rdev, peer->res);
}
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(struct rio_dev *rdev)
{
struct net_device *ndev = NULL;
struct rionet_peer *peer, *tmp;
free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
__ilog2(sizeof(void *)) + 4 : 0);
unregister_netdev(ndev);
kfree(ndev);
list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
list_del(&peer->node);
kfree(peer);
}
}
static void rionet_get_drvinfo(struct net_device *ndev,
struct ethtool_drvinfo *info)
{
struct rionet_private *rnet = netdev_priv(ndev);
strcpy(info->driver, DRV_NAME);
strcpy(info->version, DRV_VERSION);
strcpy(info->fw_version, "n/a");
strcpy(info->bus_info, rnet->mport->name);
}
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 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 = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static int rionet_setup_netdev(struct rio_mport *mport)
{
int rc = 0;
struct net_device *ndev = NULL;
struct rionet_private *rnet;
u16 device_id;
/* Allocate our net_device structure */
ndev = alloc_etherdev(sizeof(struct rionet_private));
if (ndev == NULL) {
printk(KERN_INFO "%s: could not allocate ethernet device.\n",
DRV_NAME);
rc = -ENOMEM;
goto out;
}
rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
if (!rionet_active) {
rc = -ENOMEM;
goto out;
}
memset((void *)rionet_active, 0, sizeof(void *) *
RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
/* Set up private area */
rnet = netdev_priv(ndev);
rnet->mport = mport;
/* 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 = RIO_MAX_MSG_SIZE - 14;
ndev->features = NETIF_F_LLTX;
SET_ETHTOOL_OPS(ndev, &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)
goto out;
printk("%s: %s %s Version %s, MAC %pM\n",
ndev->name,
DRV_NAME,
DRV_DESC,
DRV_VERSION,
ndev->dev_addr);
out:
return rc;
}
/*
* XXX Make multi-net safe
*/
static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
{
int rc = -ENODEV;
u32 lpef, lsrc_ops, ldst_ops;
struct rionet_peer *peer;
/* If local device is not rionet capable, give up quickly */
if (!rionet_capable)
goto out;
/*
* First time through, make sure local device is rionet
* capable, setup netdev, and set flags so this is skipped
* on later probes
*/
if (!rionet_check) {
rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
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(lpef, lsrc_ops, ldst_ops)) {
printk(KERN_ERR
"%s: local device is not network capable\n",
DRV_NAME);
rionet_check = 1;
rionet_capable = 0;
goto out;
}
rc = rionet_setup_netdev(rdev->net->hport);
rionet_check = 1;
}
/*
* If the remote device has mailbox/doorbell capabilities,
* add it to the peer list.
*/
if (dev_rionet_capable(rdev)) {
if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
rc = -ENOMEM;
goto out;
}
peer->rdev = rdev;
list_add_tail(&peer->node, &rionet_peers);
}
out:
return rc;
}
static struct rio_device_id rionet_id_table[] = {
{RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
};
static struct rio_driver rionet_driver = {
.name = "rionet",
.id_table = rionet_id_table,
.probe = rionet_probe,
.remove = rionet_remove,
};
static int __init rionet_init(void)
{
return rio_register_driver(&rionet_driver);
}
static void __exit rionet_exit(void)
{
rio_unregister_driver(&rionet_driver);
}
module_init(rionet_init);
module_exit(rionet_exit);
