/* * 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) refcount_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 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_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; /* MTU range: 68 - 4082 */ ndev->min_mtu = ETH_MIN_MTU; ndev->max_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);