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    Subject[PATCH][5/5] RapidIO support: net driver
    Date
    From
    Adds an "Ethernet" driver which sends Ethernet packets over the
    standard RapidIO messaging. This depends on the core RIO
    patch for mailbox/doorbell access.

    Signed-off-by: Matt Porter <mporter@kernel.crashing.org>

    diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
    --- a/drivers/net/Kconfig
    +++ b/drivers/net/Kconfig
    @@ -2185,6 +2185,20 @@ config ISERIES_VETH
    tristate "iSeries Virtual Ethernet driver support"
    depends on NETDEVICES && PPC_ISERIES

    +config RIONET
    + tristate "RapidIO Ethernet over messaging driver support"
    + depends on NETDEVICES && RAPIDIO
    +
    +config RIONET_TX_SIZE
    + int "Number of outbound queue entries"
    + depends on RIONET
    + default "128"
    +
    +config RIONET_RX_SIZE
    + int "Number of inbound queue entries"
    + depends on RIONET
    + default "128"
    +
    config FDDI
    bool "FDDI driver support"
    depends on NETDEVICES && (PCI || EISA)
    diff --git a/drivers/net/Makefile b/drivers/net/Makefile
    --- a/drivers/net/Makefile
    +++ b/drivers/net/Makefile
    @@ -58,6 +58,7 @@ obj-$(CONFIG_SKFP) += skfp/
    obj-$(CONFIG_VIA_RHINE) += via-rhine.o
    obj-$(CONFIG_VIA_VELOCITY) += via-velocity.o
    obj-$(CONFIG_ADAPTEC_STARFIRE) += starfire.o
    +obj-$(CONFIG_RIONET) += rionet.o

    #
    # end link order section
    diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
    new file mode 100644
    --- /dev/null
    +++ b/drivers/net/rionet.c
    @@ -0,0 +1,597 @@
    +/*
    + * 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 "0.1"
    +#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 0
    +#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];
    + struct net_device_stats stats;
    + 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;
    +static struct net_device *sndev = NULL;
    +
    +/*
    + * This is a fast lookup table for 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[RIO_MAX_ROUTE_ENTRIES];
    +
    +#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 struct net_device_stats *rionet_stats(struct net_device *ndev)
    +{
    + struct rionet_private *rnet = ndev->priv;
    + return &rnet->stats;
    +}
    +
    +static int rionet_rx_clean(struct net_device *ndev)
    +{
    + int i;
    + int error = 0;
    + struct rionet_private *rnet = ndev->priv;
    + void *data;
    +
    + i = rnet->rx_slot;
    +
    + do {
    + if (!rnet->rx_skb[i]) {
    + rnet->stats.rx_dropped++;
    + 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]->dev = ndev;
    + 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) {
    + rnet->stats.rx_dropped++;
    + } else if (error == NET_RX_BAD) {
    + if (netif_msg_rx_err(rnet))
    + printk(KERN_WARNING "%s: bad rx packet\n",
    + DRV_NAME);
    + rnet->stats.rx_errors++;
    + } else {
    + rnet->stats.rx_packets++;
    + rnet->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 = ndev->priv;
    +
    + 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 = ndev->priv;
    +
    + rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
    + rnet->tx_skb[rnet->tx_slot] = skb;
    +
    + rnet->stats.tx_packets++;
    + rnet->stats.tx_bytes += skb->len;
    +
    + if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
    + netif_stop_queue(ndev);
    +
    + if (++rnet->tx_slot == RIONET_TX_RING_SIZE)
    + rnet->tx_slot = 0;
    +
    + 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 = ndev->priv;
    + 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) {
    + /*
    + * XXX Need to delay queuing if ring max is reached,
    + * flush additional packets in tx_event() before
    + * awakening the queue. We can easily exceed ring
    + * size with a large number of nodes or even a
    + * small number where the ring is relatively full
    + * on entrance to hard_start_xmit.
    + */
    + for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; 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 0;
    +}
    +
    +static int rionet_set_mac_address(struct net_device *ndev, void *p)
    +{
    + struct sockaddr *addr = p;
    +
    + if (!is_valid_ether_addr(addr->sa_data))
    + return -EADDRNOTAVAIL;
    +
    + memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
    +
    + return 0;
    +}
    +
    +static void rionet_dbell_event(struct rio_mport *mport, u16 sid, u16 tid,
    + u16 info)
    +{
    + struct net_device *ndev = sndev;
    + struct rionet_private *rnet = ndev->priv;
    + 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, int mbox, int slot)
    +{
    + int n;
    + struct net_device *ndev = sndev;
    + struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
    +
    + 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, int mbox, int slot)
    +{
    + struct net_device *ndev = sndev;
    + struct rionet_private *rnet = ndev->priv;
    +
    + 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;
    + if (++rnet->ack_slot == RIONET_TX_RING_SIZE)
    + rnet->ack_slot = 0;
    + 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 = ndev->priv;
    +
    + if (netif_msg_ifup(rnet))
    + printk(KERN_INFO "%s: open\n", DRV_NAME);
    +
    + if ((rc = rio_request_inb_dbell(rnet->mport,
    + RIONET_DOORBELL_JOIN,
    + RIONET_DOORBELL_LEAVE,
    + rionet_dbell_event)) < 0)
    + goto out;
    +
    + if ((rc = rio_request_inb_mbox(rnet->mport,
    + RIONET_MAILBOX,
    + RIONET_RX_RING_SIZE,
    + rionet_inb_msg_event)) < 0)
    + goto out;
    +
    + if ((rc = rio_request_outb_mbox(rnet->mport,
    + 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 = (struct rionet_private *)ndev->priv;
    + 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++)
    + if (rnet->rx_skb[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;
    +
    + 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 = ndev->priv;
    +
    + strcpy(info->driver, DRV_NAME);
    + strcpy(info->version, DRV_VERSION);
    + strcpy(info->fw_version, "n/a");
    + sprintf(info->bus_info, "RIO master port %d", rnet->mport->id);
    +}
    +
    +static u32 rionet_get_msglevel(struct net_device *ndev)
    +{
    + struct rionet_private *rnet = ndev->priv;
    +
    + return rnet->msg_enable;
    +}
    +
    +static void rionet_set_msglevel(struct net_device *ndev, u32 value)
    +{
    + struct rionet_private *rnet = ndev->priv;
    +
    + rnet->msg_enable = value;
    +}
    +
    +static 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 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;
    + }
    +
    + /*
    + * XXX hack, store point a static at ndev so we can get it...
    + * Perhaps need an array of these that the handler can
    + * index via the mbox number.
    + */
    + sndev = ndev;
    +
    + /* Set up private area */
    + rnet = (struct rionet_private *)ndev->priv;
    + 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;
    +
    + /* Fill in the driver function table */
    + ndev->open = &rionet_open;
    + ndev->hard_start_xmit = &rionet_start_xmit;
    + ndev->stop = &rionet_close;
    + ndev->get_stats = &rionet_stats;
    + ndev->set_mac_address = &rionet_set_mac_address;
    + ndev->mtu = RIO_MAX_MSG_SIZE - 14;
    + ndev->features = NETIF_F_LLTX;
    + SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
    +
    + SET_MODULE_OWNER(ndev);
    +
    + 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 %02x:%02x:%02x:%02x:%02x:%02x\n",
    + ndev->name,
    + DRV_NAME,
    + DRV_DESC,
    + DRV_VERSION,
    + ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
    + ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
    +
    + 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);
    -
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