/* * 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 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 if (error == NET_RX_BAD) { if (netif_msg_rx_err(rnet)) printk(KERN_WARNING "%s: bad rx packet\n", DRV_NAME); ndev->stats.rx_errors++; } 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 0; } 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 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; /* Fill in the driver function table */ ndev->open = &rionet_open; ndev->hard_start_xmit = &rionet_start_xmit; ndev->stop = &rionet_close; 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);