Initial import

1 files changed, 644 insertions, 0 deletions

diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
new file mode 100644
index 000000000..dac7a0d9b
--- /dev/null
+++ b/drivers/net/rionet.c
@@ -0,0 +1,644 @@
+/*
+ * 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>
+
+#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
+
+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;
+};
+
+struct rionet_net {
+	struct net_device *ndev;
+	struct list_head peers;
+	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;
+
+	local_irq_save(flags);
+	if (!spin_trylock(&rnet->tx_lock)) {
+		local_irq_restore(flags);
+		return NETDEV_TX_LOCKED;
+	}
+
+	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;
+
+	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[rnet->mport->id].active[sid]) {
+			list_for_each_entry(peer,
+					   &nets[rnet->mport->id].peers, node) {
+				if (peer->rdev->destid == sid) {
+					nets[rnet->mport->id].active[sid] =
+								peer->rdev;
+					nets[rnet->mport->id].nact++;
+				}
+			}
+			rio_mport_send_doorbell(mport, sid,
+						RIONET_DOORBELL_JOIN);
+		}
+	} else if (info == RIONET_DOORBELL_LEAVE) {
+		nets[rnet->mport->id].active[sid] = NULL;
+		nets[rnet->mport->id].nact--;
+	} 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;
+	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,
+				 &nets[rnet->mport->id].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;
+		}
+
+		/* Send a join message */
+		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 %s\n", DRV_NAME, ndev->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,
+				 &nets[rnet->mport->id].peers, node) {
+		if (nets[rnet->mport->id].active[peer->rdev->destid]) {
+			rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
+			nets[rnet->mport->id].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 int 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, *tmp;
+
+	if (dev_rionet_capable(rdev)) {
+		list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
+			if (peer->rdev == rdev) {
+				if (nets[netid].active[rdev->destid]) {
+					nets[netid].active[rdev->destid] = NULL;
+					nets[netid].nact--;
+				}
+
+				list_del(&peer->node);
+				kfree(peer);
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+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 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, 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;
+
+	/* 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_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)
+		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 unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
+
+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;
+	int oldnet;
+
+	if (netid >= RIONET_MAX_NETS)
+		return rc;
+
+	oldnet = test_and_set_bit(netid, net_table);
+
+	/*
+	 * 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 (!oldnet) {
+		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;
+		}
+		nets[netid].ndev = ndev;
+		rc = rionet_setup_netdev(rdev->net->hport, ndev);
+		if (rc) {
+			printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
+			       DRV_NAME, rc);
+			goto out;
+		}
+
+		INIT_LIST_HEAD(&nets[netid].peers);
+		nets[netid].nact = 0;
+	} else if (nets[netid].ndev == NULL)
+		goto out;
+
+	/*
+	 * 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, &nets[netid].peers);
+	}
+
+	return 0;
+out:
+	return rc;
+}
+
+#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 int __init rionet_init(void)
+{
+	return subsys_interface_register(&rionet_interface);
+}
+
+static void __exit rionet_exit(void)
+{
+	struct rionet_private *rnet;
+	struct net_device *ndev;
+	struct rionet_peer *peer, *tmp;
+	int i;
+
+	for (i = 0; i < RIONET_MAX_NETS; i++) {
+		if (nets[i].ndev != NULL) {
+			ndev = nets[i].ndev;
+			rnet = netdev_priv(ndev);
+			unregister_netdev(ndev);
+
+			list_for_each_entry_safe(peer,
+						 tmp, &nets[i].peers, node) {
+				list_del(&peer->node);
+				kfree(peer);
+			}
+
+			free_pages((unsigned long)nets[i].active,
+				 get_order(sizeof(void *) *
+				 RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
+			nets[i].active = NULL;
+
+			free_netdev(ndev);
+		}
+	}
+
+	subsys_interface_unregister(&rionet_interface);
+}
+
+late_initcall(rionet_init);
+module_exit(rionet_exit);