645 строки
16 KiB
C
645 строки
16 KiB
C
/*
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* rionet - Ethernet driver over RapidIO messaging services
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*
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* Copyright 2005 MontaVista Software, Inc.
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* Matt Porter <mporter@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/rio.h>
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#include <linux/rio_drv.h>
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#include <linux/slab.h>
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#include <linux/rio_ids.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/crc32.h>
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#include <linux/ethtool.h>
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#define DRV_NAME "rionet"
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#define DRV_VERSION "0.3"
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#define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
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#define DRV_DESC "Ethernet over RapidIO"
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MODULE_AUTHOR(DRV_AUTHOR);
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_LICENSE("GPL");
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#define RIONET_DEFAULT_MSGLEVEL \
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(NETIF_MSG_DRV | \
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NETIF_MSG_LINK | \
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NETIF_MSG_RX_ERR | \
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NETIF_MSG_TX_ERR)
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#define RIONET_DOORBELL_JOIN 0x1000
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#define RIONET_DOORBELL_LEAVE 0x1001
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#define RIONET_MAILBOX 0
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#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
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#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
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#define RIONET_MAX_NETS 8
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struct rionet_private {
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struct rio_mport *mport;
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struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
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struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
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int rx_slot;
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int tx_slot;
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int tx_cnt;
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int ack_slot;
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spinlock_t lock;
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spinlock_t tx_lock;
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u32 msg_enable;
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};
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struct rionet_peer {
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struct list_head node;
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struct rio_dev *rdev;
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struct resource *res;
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};
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struct rionet_net {
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struct net_device *ndev;
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struct list_head peers;
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struct rio_dev **active;
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int nact; /* number of active peers */
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};
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static struct rionet_net nets[RIONET_MAX_NETS];
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#define is_rionet_capable(src_ops, dst_ops) \
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((src_ops & RIO_SRC_OPS_DATA_MSG) && \
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(dst_ops & RIO_DST_OPS_DATA_MSG) && \
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(src_ops & RIO_SRC_OPS_DOORBELL) && \
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(dst_ops & RIO_DST_OPS_DOORBELL))
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#define dev_rionet_capable(dev) \
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is_rionet_capable(dev->src_ops, dev->dst_ops)
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#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
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#define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
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static int rionet_rx_clean(struct net_device *ndev)
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{
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int i;
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int error = 0;
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struct rionet_private *rnet = netdev_priv(ndev);
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void *data;
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i = rnet->rx_slot;
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do {
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if (!rnet->rx_skb[i])
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continue;
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if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
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break;
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rnet->rx_skb[i]->data = data;
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skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
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rnet->rx_skb[i]->protocol =
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eth_type_trans(rnet->rx_skb[i], ndev);
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error = netif_rx(rnet->rx_skb[i]);
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if (error == NET_RX_DROP) {
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ndev->stats.rx_dropped++;
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} else {
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ndev->stats.rx_packets++;
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ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
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}
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} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
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return i;
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}
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static void rionet_rx_fill(struct net_device *ndev, int end)
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{
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int i;
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struct rionet_private *rnet = netdev_priv(ndev);
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i = rnet->rx_slot;
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do {
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rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
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if (!rnet->rx_skb[i])
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break;
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rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
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rnet->rx_skb[i]->data);
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} while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
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rnet->rx_slot = i;
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}
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static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
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struct rio_dev *rdev)
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{
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struct rionet_private *rnet = netdev_priv(ndev);
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rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
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rnet->tx_skb[rnet->tx_slot] = skb;
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
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netif_stop_queue(ndev);
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++rnet->tx_slot;
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rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
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if (netif_msg_tx_queued(rnet))
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printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
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skb->len);
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return 0;
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}
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static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
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{
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int i;
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struct rionet_private *rnet = netdev_priv(ndev);
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struct ethhdr *eth = (struct ethhdr *)skb->data;
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u16 destid;
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unsigned long flags;
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int add_num = 1;
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local_irq_save(flags);
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if (!spin_trylock(&rnet->tx_lock)) {
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local_irq_restore(flags);
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return NETDEV_TX_LOCKED;
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}
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if (is_multicast_ether_addr(eth->h_dest))
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add_num = nets[rnet->mport->id].nact;
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if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
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netif_stop_queue(ndev);
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spin_unlock_irqrestore(&rnet->tx_lock, flags);
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printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
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ndev->name);
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return NETDEV_TX_BUSY;
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}
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if (is_multicast_ether_addr(eth->h_dest)) {
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int count = 0;
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for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
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i++)
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if (nets[rnet->mport->id].active[i]) {
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rionet_queue_tx_msg(skb, ndev,
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nets[rnet->mport->id].active[i]);
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if (count)
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atomic_inc(&skb->users);
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count++;
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}
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} else if (RIONET_MAC_MATCH(eth->h_dest)) {
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destid = RIONET_GET_DESTID(eth->h_dest);
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if (nets[rnet->mport->id].active[destid])
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rionet_queue_tx_msg(skb, ndev,
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nets[rnet->mport->id].active[destid]);
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else {
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/*
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* If the target device was removed from the list of
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* active peers but we still have TX packets targeting
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* it just report sending a packet to the target
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* (without actual packet transfer).
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*/
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dev_kfree_skb_any(skb);
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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}
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}
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spin_unlock_irqrestore(&rnet->tx_lock, flags);
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return NETDEV_TX_OK;
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}
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static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
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u16 info)
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{
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struct net_device *ndev = dev_id;
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struct rionet_private *rnet = netdev_priv(ndev);
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struct rionet_peer *peer;
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if (netif_msg_intr(rnet))
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printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
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DRV_NAME, sid, tid, info);
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if (info == RIONET_DOORBELL_JOIN) {
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if (!nets[rnet->mport->id].active[sid]) {
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list_for_each_entry(peer,
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&nets[rnet->mport->id].peers, node) {
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if (peer->rdev->destid == sid) {
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nets[rnet->mport->id].active[sid] =
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peer->rdev;
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nets[rnet->mport->id].nact++;
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}
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}
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rio_mport_send_doorbell(mport, sid,
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RIONET_DOORBELL_JOIN);
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}
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} else if (info == RIONET_DOORBELL_LEAVE) {
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nets[rnet->mport->id].active[sid] = NULL;
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nets[rnet->mport->id].nact--;
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} else {
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if (netif_msg_intr(rnet))
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printk(KERN_WARNING "%s: unhandled doorbell\n",
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DRV_NAME);
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}
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}
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static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
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{
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int n;
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struct net_device *ndev = dev_id;
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struct rionet_private *rnet = netdev_priv(ndev);
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if (netif_msg_intr(rnet))
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printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
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DRV_NAME, mbox, slot);
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spin_lock(&rnet->lock);
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if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
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rionet_rx_fill(ndev, n);
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spin_unlock(&rnet->lock);
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}
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static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
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{
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struct net_device *ndev = dev_id;
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struct rionet_private *rnet = netdev_priv(ndev);
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spin_lock(&rnet->lock);
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if (netif_msg_intr(rnet))
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printk(KERN_INFO
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"%s: outbound message event, mbox %d slot %d\n",
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DRV_NAME, mbox, slot);
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while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
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/* dma unmap single */
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dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
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rnet->tx_skb[rnet->ack_slot] = NULL;
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++rnet->ack_slot;
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rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
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rnet->tx_cnt--;
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}
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if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
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netif_wake_queue(ndev);
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spin_unlock(&rnet->lock);
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}
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static int rionet_open(struct net_device *ndev)
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{
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int i, rc = 0;
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struct rionet_peer *peer, *tmp;
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struct rionet_private *rnet = netdev_priv(ndev);
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if (netif_msg_ifup(rnet))
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printk(KERN_INFO "%s: open\n", DRV_NAME);
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if ((rc = rio_request_inb_dbell(rnet->mport,
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(void *)ndev,
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RIONET_DOORBELL_JOIN,
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RIONET_DOORBELL_LEAVE,
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rionet_dbell_event)) < 0)
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goto out;
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if ((rc = rio_request_inb_mbox(rnet->mport,
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(void *)ndev,
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RIONET_MAILBOX,
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RIONET_RX_RING_SIZE,
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rionet_inb_msg_event)) < 0)
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goto out;
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if ((rc = rio_request_outb_mbox(rnet->mport,
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(void *)ndev,
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RIONET_MAILBOX,
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RIONET_TX_RING_SIZE,
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rionet_outb_msg_event)) < 0)
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goto out;
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/* Initialize inbound message ring */
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for (i = 0; i < RIONET_RX_RING_SIZE; i++)
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rnet->rx_skb[i] = NULL;
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rnet->rx_slot = 0;
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rionet_rx_fill(ndev, 0);
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rnet->tx_slot = 0;
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rnet->tx_cnt = 0;
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rnet->ack_slot = 0;
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netif_carrier_on(ndev);
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netif_start_queue(ndev);
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list_for_each_entry_safe(peer, tmp,
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&nets[rnet->mport->id].peers, node) {
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if (!(peer->res = rio_request_outb_dbell(peer->rdev,
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RIONET_DOORBELL_JOIN,
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RIONET_DOORBELL_LEAVE)))
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{
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printk(KERN_ERR "%s: error requesting doorbells\n",
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DRV_NAME);
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continue;
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}
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/* Send a join message */
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rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
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}
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out:
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return rc;
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}
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static int rionet_close(struct net_device *ndev)
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{
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struct rionet_private *rnet = netdev_priv(ndev);
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struct rionet_peer *peer, *tmp;
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int i;
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if (netif_msg_ifup(rnet))
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printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
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netif_stop_queue(ndev);
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netif_carrier_off(ndev);
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for (i = 0; i < RIONET_RX_RING_SIZE; i++)
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kfree_skb(rnet->rx_skb[i]);
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list_for_each_entry_safe(peer, tmp,
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&nets[rnet->mport->id].peers, node) {
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if (nets[rnet->mport->id].active[peer->rdev->destid]) {
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rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
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nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
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}
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rio_release_outb_dbell(peer->rdev, peer->res);
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}
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rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
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RIONET_DOORBELL_LEAVE);
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rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
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rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
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return 0;
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}
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static int rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
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{
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struct rio_dev *rdev = to_rio_dev(dev);
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unsigned char netid = rdev->net->hport->id;
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struct rionet_peer *peer, *tmp;
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if (dev_rionet_capable(rdev)) {
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list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
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if (peer->rdev == rdev) {
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if (nets[netid].active[rdev->destid]) {
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nets[netid].active[rdev->destid] = NULL;
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nets[netid].nact--;
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}
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list_del(&peer->node);
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kfree(peer);
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break;
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}
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}
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}
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return 0;
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}
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static void rionet_get_drvinfo(struct net_device *ndev,
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struct ethtool_drvinfo *info)
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{
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struct rionet_private *rnet = netdev_priv(ndev);
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
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strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
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}
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static u32 rionet_get_msglevel(struct net_device *ndev)
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{
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struct rionet_private *rnet = netdev_priv(ndev);
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return rnet->msg_enable;
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}
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static void rionet_set_msglevel(struct net_device *ndev, u32 value)
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{
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struct rionet_private *rnet = netdev_priv(ndev);
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rnet->msg_enable = value;
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}
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static const struct ethtool_ops rionet_ethtool_ops = {
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.get_drvinfo = rionet_get_drvinfo,
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.get_msglevel = rionet_get_msglevel,
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.set_msglevel = rionet_set_msglevel,
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.get_link = ethtool_op_get_link,
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};
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static const struct net_device_ops rionet_netdev_ops = {
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.ndo_open = rionet_open,
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.ndo_stop = rionet_close,
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.ndo_start_xmit = rionet_start_xmit,
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.ndo_change_mtu = eth_change_mtu,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_set_mac_address = eth_mac_addr,
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};
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static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
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{
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int rc = 0;
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struct rionet_private *rnet;
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u16 device_id;
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const size_t rionet_active_bytes = sizeof(void *) *
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RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
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nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
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get_order(rionet_active_bytes));
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if (!nets[mport->id].active) {
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rc = -ENOMEM;
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goto out;
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}
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memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
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|
/* 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);
|
|
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(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);
|