[PATCH] Add rapidio net driver
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> Cc: Jeff Garzik <jgarzik@pobox.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Matt Porter
Jeff Garzik
parent
43ec6e95e4
commit
f89efd523b
3 changed files with 589 additions and 0 deletions
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@ -2235,6 +2235,20 @@ config ISERIES_VETH
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tristate "iSeries Virtual Ethernet driver support"
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depends on PPC_ISERIES
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config RIONET
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tristate "RapidIO Ethernet over messaging driver support"
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depends on NETDEVICES && RAPIDIO
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config RIONET_TX_SIZE
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int "Number of outbound queue entries"
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depends on RIONET
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default "128"
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config RIONET_RX_SIZE
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int "Number of inbound queue entries"
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depends on RIONET
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default "128"
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config FDDI
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bool "FDDI driver support"
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depends on (PCI || EISA)
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@ -63,6 +63,7 @@ obj-$(CONFIG_SKFP) += skfp/
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obj-$(CONFIG_VIA_RHINE) += via-rhine.o
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obj-$(CONFIG_VIA_VELOCITY) += via-velocity.o
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obj-$(CONFIG_ADAPTEC_STARFIRE) += starfire.o
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obj-$(CONFIG_RIONET) += rionet.o
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#
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# end link order section
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574
drivers/net/rionet.c
Normal file
574
drivers/net/rionet.c
Normal file
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@ -0,0 +1,574 @@
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/*
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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/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 "0.2"
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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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static LIST_HEAD(rionet_peers);
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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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struct net_device_stats stats;
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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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static int rionet_check = 0;
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static int rionet_capable = 1;
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/*
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* This is a fast lookup table for for translating TX
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* Ethernet packets into a destination RIO device. It
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* could be made into a hash table to save memory depending
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* on system trade-offs.
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*/
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static struct rio_dev *rionet_active[RIO_MAX_ROUTE_ENTRIES];
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#define is_rionet_capable(pef, src_ops, dst_ops) \
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((pef & RIO_PEF_INB_MBOX) && \
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(pef & RIO_PEF_INB_DOORBELL) && \
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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->pef, dev->src_ops, dev->dst_ops)
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#define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
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#define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))
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static struct net_device_stats *rionet_stats(struct net_device *ndev)
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{
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struct rionet_private *rnet = ndev->priv;
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return &rnet->stats;
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}
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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 = ndev->priv;
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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]->dev = ndev;
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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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rnet->stats.rx_dropped++;
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} else if (error == NET_RX_BAD) {
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if (netif_msg_rx_err(rnet))
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printk(KERN_WARNING "%s: bad rx packet\n",
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DRV_NAME);
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rnet->stats.rx_errors++;
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} else {
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rnet->stats.rx_packets++;
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rnet->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 = ndev->priv;
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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 = ndev->priv;
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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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rnet->stats.tx_packets++;
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rnet->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 %8.8x len %8.8x\n", DRV_NAME,
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(u32) skb, 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 = ndev->priv;
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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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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 ((rnet->tx_cnt + 1) > 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 (eth->h_dest[0] & 0x01) {
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for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++)
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if (rionet_active[i])
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rionet_queue_tx_msg(skb, ndev,
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rionet_active[i]);
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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 (rionet_active[destid])
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rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
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}
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spin_unlock_irqrestore(&rnet->tx_lock, flags);
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return 0;
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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 = ndev->priv;
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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 (!rionet_active[sid]) {
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list_for_each_entry(peer, &rionet_peers, node) {
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if (peer->rdev->destid == sid)
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rionet_active[sid] = peer->rdev;
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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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rionet_active[sid] = NULL;
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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 = (struct rionet_private *)ndev->priv;
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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 = ndev->priv;
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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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u32 pwdcsr;
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struct rionet_private *rnet = ndev->priv;
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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, &rionet_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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/*
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* If device has initialized inbound doorbells,
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* send a join message
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*/
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rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
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if (pwdcsr & RIO_DOORBELL_AVAIL)
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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 = (struct rionet_private *)ndev->priv;
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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\n", DRV_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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if (rnet->rx_skb[i])
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kfree_skb(rnet->rx_skb[i]);
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list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
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if (rionet_active[peer->rdev->destid]) {
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rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
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rionet_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 void rionet_remove(struct rio_dev *rdev)
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{
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struct net_device *ndev = NULL;
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struct rionet_peer *peer, *tmp;
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unregister_netdev(ndev);
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kfree(ndev);
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list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
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list_del(&peer->node);
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kfree(peer);
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}
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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 = ndev->priv;
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strcpy(info->driver, DRV_NAME);
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strcpy(info->version, DRV_VERSION);
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strcpy(info->fw_version, "n/a");
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strcpy(info->bus_info, rnet->mport->name);
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/* 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->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);
|
||||
Loading…
Reference in a new issue