sunvnet.c 29.6 KB
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/* sunvnet.c: Sun LDOM Virtual Network Driver.
 *
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 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
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#include <linux/mutex.h>
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#include <asm/vio.h>
#include <asm/ldc.h>

#include "sunvnet.h"

#define DRV_MODULE_NAME		"sunvnet"
#define DRV_MODULE_VERSION	"1.0"
#define DRV_MODULE_RELDATE	"June 25, 2007"

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Bill Pemberton 已提交
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static char version[] =
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	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

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/* Heuristic for the number of times to exponentially backoff and
 * retry sending an LDC trigger when EAGAIN is encountered
 */
#define	VNET_MAX_RETRIES	10

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/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
	{ .major = 1, .minor = 0 },
};

static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
{
	return vio_dring_avail(dr, VNET_TX_RING_SIZE);
}

static int vnet_handle_unknown(struct vnet_port *port, void *arg)
{
	struct vio_msg_tag *pkt = arg;

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	pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
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	       pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
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	pr_err("Resetting connection\n");
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	ldc_disconnect(port->vio.lp);

	return -ECONNRESET;
}

static int vnet_send_attr(struct vio_driver_state *vio)
{
	struct vnet_port *port = to_vnet_port(vio);
	struct net_device *dev = port->vp->dev;
	struct vio_net_attr_info pkt;
	int i;

	memset(&pkt, 0, sizeof(pkt));
	pkt.tag.type = VIO_TYPE_CTRL;
	pkt.tag.stype = VIO_SUBTYPE_INFO;
	pkt.tag.stype_env = VIO_ATTR_INFO;
	pkt.tag.sid = vio_send_sid(vio);
	pkt.xfer_mode = VIO_DRING_MODE;
	pkt.addr_type = VNET_ADDR_ETHERMAC;
	pkt.ack_freq = 0;
	for (i = 0; i < 6; i++)
		pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
	pkt.mtu = ETH_FRAME_LEN;

	viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
	       "ackfreq[%u] mtu[%llu]\n",
	       pkt.xfer_mode, pkt.addr_type,
	       (unsigned long long) pkt.addr,
	       pkt.ack_freq,
	       (unsigned long long) pkt.mtu);

	return vio_ldc_send(vio, &pkt, sizeof(pkt));
}

static int handle_attr_info(struct vio_driver_state *vio,
			    struct vio_net_attr_info *pkt)
{
	viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
	       "ackfreq[%u] mtu[%llu]\n",
	       pkt->xfer_mode, pkt->addr_type,
	       (unsigned long long) pkt->addr,
	       pkt->ack_freq,
	       (unsigned long long) pkt->mtu);

	pkt->tag.sid = vio_send_sid(vio);

	if (pkt->xfer_mode != VIO_DRING_MODE ||
	    pkt->addr_type != VNET_ADDR_ETHERMAC ||
	    pkt->mtu != ETH_FRAME_LEN) {
		viodbg(HS, "SEND NET ATTR NACK\n");

		pkt->tag.stype = VIO_SUBTYPE_NACK;

		(void) vio_ldc_send(vio, pkt, sizeof(*pkt));

		return -ECONNRESET;
	} else {
		viodbg(HS, "SEND NET ATTR ACK\n");

		pkt->tag.stype = VIO_SUBTYPE_ACK;

		return vio_ldc_send(vio, pkt, sizeof(*pkt));
	}

}

static int handle_attr_ack(struct vio_driver_state *vio,
			   struct vio_net_attr_info *pkt)
{
	viodbg(HS, "GOT NET ATTR ACK\n");

	return 0;
}

static int handle_attr_nack(struct vio_driver_state *vio,
			    struct vio_net_attr_info *pkt)
{
	viodbg(HS, "GOT NET ATTR NACK\n");

	return -ECONNRESET;
}

static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
{
	struct vio_net_attr_info *pkt = arg;

	switch (pkt->tag.stype) {
	case VIO_SUBTYPE_INFO:
		return handle_attr_info(vio, pkt);

	case VIO_SUBTYPE_ACK:
		return handle_attr_ack(vio, pkt);

	case VIO_SUBTYPE_NACK:
		return handle_attr_nack(vio, pkt);

	default:
		return -ECONNRESET;
	}
}

static void vnet_handshake_complete(struct vio_driver_state *vio)
{
	struct vio_dring_state *dr;

	dr = &vio->drings[VIO_DRIVER_RX_RING];
	dr->snd_nxt = dr->rcv_nxt = 1;

	dr = &vio->drings[VIO_DRIVER_TX_RING];
	dr->snd_nxt = dr->rcv_nxt = 1;
}

/* The hypervisor interface that implements copying to/from imported
 * memory from another domain requires that copies are done to 8-byte
 * aligned buffers, and that the lengths of such copies are also 8-byte
 * multiples.
 *
 * So we align skb->data to an 8-byte multiple and pad-out the data
 * area so we can round the copy length up to the next multiple of
 * 8 for the copy.
 *
 * The transmitter puts the actual start of the packet 6 bytes into
 * the buffer it sends over, so that the IP headers after the ethernet
 * header are aligned properly.  These 6 bytes are not in the descriptor
 * length, they are simply implied.  This offset is represented using
 * the VNET_PACKET_SKIP macro.
 */
static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
					   unsigned int len)
{
	struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
	unsigned long addr, off;

	if (unlikely(!skb))
		return NULL;

	addr = (unsigned long) skb->data;
	off = ((addr + 7UL) & ~7UL) - addr;
	if (off)
		skb_reserve(skb, off);

	return skb;
}

static int vnet_rx_one(struct vnet_port *port, unsigned int len,
		       struct ldc_trans_cookie *cookies, int ncookies)
{
	struct net_device *dev = port->vp->dev;
	unsigned int copy_len;
	struct sk_buff *skb;
	int err;

	err = -EMSGSIZE;
	if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
		dev->stats.rx_length_errors++;
		goto out_dropped;
	}

	skb = alloc_and_align_skb(dev, len);
	err = -ENOMEM;
	if (unlikely(!skb)) {
		dev->stats.rx_missed_errors++;
		goto out_dropped;
	}

	copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
	skb_put(skb, copy_len);
	err = ldc_copy(port->vio.lp, LDC_COPY_IN,
		       skb->data, copy_len, 0,
		       cookies, ncookies);
	if (unlikely(err < 0)) {
		dev->stats.rx_frame_errors++;
		goto out_free_skb;
	}

	skb_pull(skb, VNET_PACKET_SKIP);
	skb_trim(skb, len);
	skb->protocol = eth_type_trans(skb, dev);

	dev->stats.rx_packets++;
	dev->stats.rx_bytes += len;

	netif_rx(skb);

	return 0;

out_free_skb:
	kfree_skb(skb);

out_dropped:
	dev->stats.rx_dropped++;
	return err;
}

static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
			 u32 start, u32 end, u8 vio_dring_state)
{
	struct vio_dring_data hdr = {
		.tag = {
			.type		= VIO_TYPE_DATA,
			.stype		= VIO_SUBTYPE_ACK,
			.stype_env	= VIO_DRING_DATA,
			.sid		= vio_send_sid(&port->vio),
		},
		.dring_ident		= dr->ident,
		.start_idx		= start,
		.end_idx		= end,
		.state			= vio_dring_state,
	};
	int err, delay;
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	int retries = 0;
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	hdr.seq = dr->snd_nxt;
	delay = 1;
	do {
		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
		if (err > 0) {
			dr->snd_nxt++;
			break;
		}
		udelay(delay);
		if ((delay <<= 1) > 128)
			delay = 128;
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		if (retries++ > VNET_MAX_RETRIES) {
			pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
				port->raddr[0], port->raddr[1],
				port->raddr[2], port->raddr[3],
				port->raddr[4], port->raddr[5]);
			err = -ECONNRESET;
		}
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	} while (err == -EAGAIN);

	return err;
}

static u32 next_idx(u32 idx, struct vio_dring_state *dr)
{
	if (++idx == dr->num_entries)
		idx = 0;
	return idx;
}

static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
{
	if (idx == 0)
		idx = dr->num_entries - 1;
	else
		idx--;

	return idx;
}

static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
					struct vio_dring_state *dr,
					u32 index)
{
	struct vio_net_desc *desc = port->vio.desc_buf;
	int err;

	err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
				  (index * dr->entry_size),
				  dr->cookies, dr->ncookies);
	if (err < 0)
		return ERR_PTR(err);

	return desc;
}

static int put_rx_desc(struct vnet_port *port,
		       struct vio_dring_state *dr,
		       struct vio_net_desc *desc,
		       u32 index)
{
	int err;

	err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
				  (index * dr->entry_size),
				  dr->cookies, dr->ncookies);
	if (err < 0)
		return err;

	return 0;
}

static int vnet_walk_rx_one(struct vnet_port *port,
			    struct vio_dring_state *dr,
			    u32 index, int *needs_ack)
{
	struct vio_net_desc *desc = get_rx_desc(port, dr, index);
	struct vio_driver_state *vio = &port->vio;
	int err;

	if (IS_ERR(desc))
		return PTR_ERR(desc);

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	viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
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	       desc->hdr.state, desc->hdr.ack,
	       desc->size, desc->ncookies,
	       desc->cookies[0].cookie_addr,
	       desc->cookies[0].cookie_size);

	if (desc->hdr.state != VIO_DESC_READY)
		return 1;
	err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
	if (err == -ECONNRESET)
		return err;
	desc->hdr.state = VIO_DESC_DONE;
	err = put_rx_desc(port, dr, desc, index);
	if (err < 0)
		return err;
	*needs_ack = desc->hdr.ack;
	return 0;
}

static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
			u32 start, u32 end)
{
	struct vio_driver_state *vio = &port->vio;
	int ack_start = -1, ack_end = -1;

	end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);

	viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);

	while (start != end) {
		int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
		if (err == -ECONNRESET)
			return err;
		if (err != 0)
			break;
		if (ack_start == -1)
			ack_start = start;
		ack_end = start;
		start = next_idx(start, dr);
		if (ack && start != end) {
			err = vnet_send_ack(port, dr, ack_start, ack_end,
					    VIO_DRING_ACTIVE);
			if (err == -ECONNRESET)
				return err;
			ack_start = -1;
		}
	}
	if (unlikely(ack_start == -1))
		ack_start = ack_end = prev_idx(start, dr);
	return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
}

static int vnet_rx(struct vnet_port *port, void *msgbuf)
{
	struct vio_dring_data *pkt = msgbuf;
	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
	struct vio_driver_state *vio = &port->vio;

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	viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
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	       pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);

	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
		return 0;
	if (unlikely(pkt->seq != dr->rcv_nxt)) {
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		pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
		       pkt->seq, dr->rcv_nxt);
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		return 0;
	}

	dr->rcv_nxt++;

	/* XXX Validate pkt->start_idx and pkt->end_idx XXX */

	return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
}

static int idx_is_pending(struct vio_dring_state *dr, u32 end)
{
	u32 idx = dr->cons;
	int found = 0;

	while (idx != dr->prod) {
		if (idx == end) {
			found = 1;
			break;
		}
		idx = next_idx(idx, dr);
	}
	return found;
}

static int vnet_ack(struct vnet_port *port, void *msgbuf)
{
	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
	struct vio_dring_data *pkt = msgbuf;
	struct net_device *dev;
	struct vnet *vp;
	u32 end;

	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
		return 0;

	end = pkt->end_idx;
	if (unlikely(!idx_is_pending(dr, end)))
		return 0;

	dr->cons = next_idx(end, dr);

	vp = port->vp;
	dev = vp->dev;
	if (unlikely(netif_queue_stopped(dev) &&
		     vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
		return 1;

	return 0;
}

static int vnet_nack(struct vnet_port *port, void *msgbuf)
{
	/* XXX just reset or similar XXX */
	return 0;
}

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static int handle_mcast(struct vnet_port *port, void *msgbuf)
{
	struct vio_net_mcast_info *pkt = msgbuf;

	if (pkt->tag.stype != VIO_SUBTYPE_ACK)
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		pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
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		       port->vp->dev->name,
		       pkt->tag.type,
		       pkt->tag.stype,
		       pkt->tag.stype_env,
		       pkt->tag.sid);

	return 0;
}

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static void maybe_tx_wakeup(unsigned long param)
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{
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	struct vnet *vp = (struct vnet *)param;
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	struct net_device *dev = vp->dev;

	netif_tx_lock(dev);
	if (likely(netif_queue_stopped(dev))) {
		struct vnet_port *port;
		int wake = 1;

		list_for_each_entry(port, &vp->port_list, list) {
			struct vio_dring_state *dr;

			dr = &port->vio.drings[VIO_DRIVER_TX_RING];
			if (vnet_tx_dring_avail(dr) <
			    VNET_TX_WAKEUP_THRESH(dr)) {
				wake = 0;
				break;
			}
		}
		if (wake)
			netif_wake_queue(dev);
	}
	netif_tx_unlock(dev);
}

static void vnet_event(void *arg, int event)
{
	struct vnet_port *port = arg;
	struct vio_driver_state *vio = &port->vio;
	unsigned long flags;
	int tx_wakeup, err;

	spin_lock_irqsave(&vio->lock, flags);

	if (unlikely(event == LDC_EVENT_RESET ||
		     event == LDC_EVENT_UP)) {
		vio_link_state_change(vio, event);
		spin_unlock_irqrestore(&vio->lock, flags);

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		if (event == LDC_EVENT_RESET)
			vio_port_up(vio);
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		return;
	}

	if (unlikely(event != LDC_EVENT_DATA_READY)) {
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		pr_warning("Unexpected LDC event %d\n", event);
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		spin_unlock_irqrestore(&vio->lock, flags);
		return;
	}

	tx_wakeup = err = 0;
	while (1) {
		union {
			struct vio_msg_tag tag;
			u64 raw[8];
		} msgbuf;

		err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
		if (unlikely(err < 0)) {
			if (err == -ECONNRESET)
				vio_conn_reset(vio);
			break;
		}
		if (err == 0)
			break;
		viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
		       msgbuf.tag.type,
		       msgbuf.tag.stype,
		       msgbuf.tag.stype_env,
		       msgbuf.tag.sid);
		err = vio_validate_sid(vio, &msgbuf.tag);
		if (err < 0)
			break;

		if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
			if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
				err = vnet_rx(port, &msgbuf);
			} else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
				err = vnet_ack(port, &msgbuf);
				if (err > 0)
					tx_wakeup |= err;
			} else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
				err = vnet_nack(port, &msgbuf);
			}
		} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
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			if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
				err = handle_mcast(port, &msgbuf);
			else
				err = vio_control_pkt_engine(vio, &msgbuf);
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			if (err)
				break;
		} else {
			err = vnet_handle_unknown(port, &msgbuf);
		}
		if (err == -ECONNRESET)
			break;
	}
	spin_unlock(&vio->lock);
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	/* Kick off a tasklet to wake the queue.  We cannot call
	 * maybe_tx_wakeup directly here because we could deadlock on
	 * netif_tx_lock() with dev_watchdog()
	 */
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	if (unlikely(tx_wakeup && err != -ECONNRESET))
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		tasklet_schedule(&port->vp->vnet_tx_wakeup);

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	local_irq_restore(flags);
}

static int __vnet_tx_trigger(struct vnet_port *port)
{
	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
	struct vio_dring_data hdr = {
		.tag = {
			.type		= VIO_TYPE_DATA,
			.stype		= VIO_SUBTYPE_INFO,
			.stype_env	= VIO_DRING_DATA,
			.sid		= vio_send_sid(&port->vio),
		},
		.dring_ident		= dr->ident,
		.start_idx		= dr->prod,
		.end_idx		= (u32) -1,
	};
	int err, delay;
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	int retries = 0;
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	hdr.seq = dr->snd_nxt;
	delay = 1;
	do {
		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
		if (err > 0) {
			dr->snd_nxt++;
			break;
		}
		udelay(delay);
		if ((delay <<= 1) > 128)
			delay = 128;
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		if (retries++ > VNET_MAX_RETRIES)
			break;
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	} while (err == -EAGAIN);

	return err;
}

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static inline bool port_is_up(struct vnet_port *vnet)
{
	struct vio_driver_state *vio = &vnet->vio;

	return !!(vio->hs_state & VIO_HS_COMPLETE);
}

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struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
	unsigned int hash = vnet_hashfn(skb->data);
	struct hlist_head *hp = &vp->port_hash[hash];
	struct vnet_port *port;

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	hlist_for_each_entry(port, hp, hash) {
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		if (!port_is_up(port))
			continue;
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		if (ether_addr_equal(port->raddr, skb->data))
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			return port;
	}
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	list_for_each_entry(port, &vp->port_list, list) {
		if (!port->switch_port)
			continue;
		if (!port_is_up(port))
			continue;
		return port;
	}
	return NULL;
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
}

struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
	struct vnet_port *ret;
	unsigned long flags;

	spin_lock_irqsave(&vp->lock, flags);
	ret = __tx_port_find(vp, skb);
	spin_unlock_irqrestore(&vp->lock, flags);

	return ret;
}

static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct vnet *vp = netdev_priv(dev);
	struct vnet_port *port = tx_port_find(vp, skb);
	struct vio_dring_state *dr;
	struct vio_net_desc *d;
	unsigned long flags;
	unsigned int len;
	void *tx_buf;
	int i, err;

	if (unlikely(!port))
		goto out_dropped;

	spin_lock_irqsave(&port->vio.lock, flags);

	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
	if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
		if (!netif_queue_stopped(dev)) {
			netif_stop_queue(dev);

			/* This is a hard error, log it. */
698
			netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
			dev->stats.tx_errors++;
		}
		spin_unlock_irqrestore(&port->vio.lock, flags);
		return NETDEV_TX_BUSY;
	}

	d = vio_dring_cur(dr);

	tx_buf = port->tx_bufs[dr->prod].buf;
	skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);

	len = skb->len;
	if (len < ETH_ZLEN) {
		len = ETH_ZLEN;
		memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
	}

716 717 718 719 720 721 722 723 724
	/* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
	 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
	 * the protocol itself does not require it as long as the peer
	 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
	 *
	 * An ACK for every packet in the ring is expensive as the
	 * sending of LDC messages is slow and affects performance.
	 */
	d->hdr.ack = VIO_ACK_DISABLE;
725 726 727 728 729 730 731 732 733 734 735 736 737 738
	d->size = len;
	d->ncookies = port->tx_bufs[dr->prod].ncookies;
	for (i = 0; i < d->ncookies; i++)
		d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];

	/* This has to be a non-SMP write barrier because we are writing
	 * to memory which is shared with the peer LDOM.
	 */
	wmb();

	d->hdr.state = VIO_DESC_READY;

	err = __vnet_tx_trigger(port);
	if (unlikely(err < 0)) {
739
		netdev_info(dev, "TX trigger error %d\n", err);
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
		d->hdr.state = VIO_DESC_FREE;
		dev->stats.tx_carrier_errors++;
		goto out_dropped_unlock;
	}

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;

	dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
	if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
		netif_stop_queue(dev);
		if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
			netif_wake_queue(dev);
	}

	spin_unlock_irqrestore(&port->vio.lock, flags);

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;

out_dropped_unlock:
	spin_unlock_irqrestore(&port->vio.lock, flags);

out_dropped:
	dev_kfree_skb(skb);
	dev->stats.tx_dropped++;
	return NETDEV_TX_OK;
}

static void vnet_tx_timeout(struct net_device *dev)
{
	/* XXX Implement me XXX */
}

static int vnet_open(struct net_device *dev)
{
	netif_carrier_on(dev);
	netif_start_queue(dev);

	return 0;
}

static int vnet_close(struct net_device *dev)
{
	netif_stop_queue(dev);
	netif_carrier_off(dev);

	return 0;
}

791 792 793 794 795
static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
{
	struct vnet_mcast_entry *m;

	for (m = vp->mcast_list; m; m = m->next) {
796
		if (ether_addr_equal(m->addr, addr))
797 798 799 800 801 802 803
			return m;
	}
	return NULL;
}

static void __update_mc_list(struct vnet *vp, struct net_device *dev)
{
804
	struct netdev_hw_addr *ha;
805

806
	netdev_for_each_mc_addr(ha, dev) {
807 808
		struct vnet_mcast_entry *m;

809
		m = __vnet_mc_find(vp, ha->addr);
810 811 812 813 814 815 816 817 818
		if (m) {
			m->hit = 1;
			continue;
		}

		if (!m) {
			m = kzalloc(sizeof(*m), GFP_ATOMIC);
			if (!m)
				continue;
819
			memcpy(m->addr, ha->addr, ETH_ALEN);
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
			m->hit = 1;

			m->next = vp->mcast_list;
			vp->mcast_list = m;
		}
	}
}

static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
{
	struct vio_net_mcast_info info;
	struct vnet_mcast_entry *m, **pp;
	int n_addrs;

	memset(&info, 0, sizeof(info));

	info.tag.type = VIO_TYPE_CTRL;
	info.tag.stype = VIO_SUBTYPE_INFO;
	info.tag.stype_env = VNET_MCAST_INFO;
	info.tag.sid = vio_send_sid(&port->vio);
	info.set = 1;

	n_addrs = 0;
	for (m = vp->mcast_list; m; m = m->next) {
		if (m->sent)
			continue;
		m->sent = 1;
		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
		       m->addr, ETH_ALEN);
		if (++n_addrs == VNET_NUM_MCAST) {
			info.count = n_addrs;

			(void) vio_ldc_send(&port->vio, &info,
					    sizeof(info));
			n_addrs = 0;
		}
	}
	if (n_addrs) {
		info.count = n_addrs;
		(void) vio_ldc_send(&port->vio, &info, sizeof(info));
	}

	info.set = 0;

	n_addrs = 0;
	pp = &vp->mcast_list;
	while ((m = *pp) != NULL) {
		if (m->hit) {
			m->hit = 0;
			pp = &m->next;
			continue;
		}

		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
		       m->addr, ETH_ALEN);
		if (++n_addrs == VNET_NUM_MCAST) {
			info.count = n_addrs;
			(void) vio_ldc_send(&port->vio, &info,
					    sizeof(info));
			n_addrs = 0;
		}

		*pp = m->next;
		kfree(m);
	}
	if (n_addrs) {
		info.count = n_addrs;
		(void) vio_ldc_send(&port->vio, &info, sizeof(info));
	}
}

891 892
static void vnet_set_rx_mode(struct net_device *dev)
{
893 894 895 896 897 898 899 900 901 902 903 904 905 906
	struct vnet *vp = netdev_priv(dev);
	struct vnet_port *port;
	unsigned long flags;

	spin_lock_irqsave(&vp->lock, flags);
	if (!list_empty(&vp->port_list)) {
		port = list_entry(vp->port_list.next, struct vnet_port, list);

		if (port->switch_port) {
			__update_mc_list(vp, dev);
			__send_mc_list(vp, port);
		}
	}
	spin_unlock_irqrestore(&vp->lock, flags);
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925
}

static int vnet_change_mtu(struct net_device *dev, int new_mtu)
{
	if (new_mtu != ETH_DATA_LEN)
		return -EINVAL;

	dev->mtu = new_mtu;
	return 0;
}

static int vnet_set_mac_addr(struct net_device *dev, void *p)
{
	return -EINVAL;
}

static void vnet_get_drvinfo(struct net_device *dev,
			     struct ethtool_drvinfo *info)
{
926 927
	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
}

static u32 vnet_get_msglevel(struct net_device *dev)
{
	struct vnet *vp = netdev_priv(dev);
	return vp->msg_enable;
}

static void vnet_set_msglevel(struct net_device *dev, u32 value)
{
	struct vnet *vp = netdev_priv(dev);
	vp->msg_enable = value;
}

static const struct ethtool_ops vnet_ethtool_ops = {
	.get_drvinfo		= vnet_get_drvinfo,
	.get_msglevel		= vnet_get_msglevel,
	.set_msglevel		= vnet_set_msglevel,
	.get_link		= ethtool_op_get_link,
};

static void vnet_port_free_tx_bufs(struct vnet_port *port)
{
	struct vio_dring_state *dr;
	int i;

	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
	if (dr->base) {
		ldc_free_exp_dring(port->vio.lp, dr->base,
				   (dr->entry_size * dr->num_entries),
				   dr->cookies, dr->ncookies);
		dr->base = NULL;
		dr->entry_size = 0;
		dr->num_entries = 0;
		dr->pending = 0;
		dr->ncookies = 0;
	}

	for (i = 0; i < VNET_TX_RING_SIZE; i++) {
		void *buf = port->tx_bufs[i].buf;

		if (!buf)
			continue;

		ldc_unmap(port->vio.lp,
			  port->tx_bufs[i].cookies,
			  port->tx_bufs[i].ncookies);

		kfree(buf);
		port->tx_bufs[i].buf = NULL;
	}
}

B
Bill Pemberton 已提交
981
static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
982 983 984 985 986 987 988 989 990 991 992
{
	struct vio_dring_state *dr;
	unsigned long len;
	int i, err, ncookies;
	void *dring;

	for (i = 0; i < VNET_TX_RING_SIZE; i++) {
		void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
		int map_len = (ETH_FRAME_LEN + 7) & ~7;

		err = -ENOMEM;
993
		if (!buf)
994
			goto err_out;
995

996 997
		err = -EFAULT;
		if ((unsigned long)buf & (8UL - 1)) {
998
			pr_err("TX buffer misaligned\n");
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
			kfree(buf);
			goto err_out;
		}

		err = ldc_map_single(port->vio.lp, buf, map_len,
				     port->tx_bufs[i].cookies, 2,
				     (LDC_MAP_SHADOW |
				      LDC_MAP_DIRECT |
				      LDC_MAP_RW));
		if (err < 0) {
			kfree(buf);
			goto err_out;
		}
		port->tx_bufs[i].buf = buf;
		port->tx_bufs[i].ncookies = err;
	}

	dr = &port->vio.drings[VIO_DRIVER_TX_RING];

	len = (VNET_TX_RING_SIZE *
	       (sizeof(struct vio_net_desc) +
		(sizeof(struct ldc_trans_cookie) * 2)));

	ncookies = VIO_MAX_RING_COOKIES;
	dring = ldc_alloc_exp_dring(port->vio.lp, len,
				    dr->cookies, &ncookies,
				    (LDC_MAP_SHADOW |
				     LDC_MAP_DIRECT |
				     LDC_MAP_RW));
	if (IS_ERR(dring)) {
		err = PTR_ERR(dring);
		goto err_out;
	}

	dr->base = dring;
	dr->entry_size = (sizeof(struct vio_net_desc) +
			  (sizeof(struct ldc_trans_cookie) * 2));
	dr->num_entries = VNET_TX_RING_SIZE;
	dr->prod = dr->cons = 0;
	dr->pending = VNET_TX_RING_SIZE;
	dr->ncookies = ncookies;

	return 0;

err_out:
	vnet_port_free_tx_bufs(port);

	return err;
}

1049 1050 1051
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);

1052 1053 1054
static const struct net_device_ops vnet_ops = {
	.ndo_open		= vnet_open,
	.ndo_stop		= vnet_close,
1055
	.ndo_set_rx_mode	= vnet_set_rx_mode,
1056
	.ndo_set_mac_address	= vnet_set_mac_addr,
1057
	.ndo_validate_addr	= eth_validate_addr,
1058 1059 1060 1061 1062
	.ndo_tx_timeout		= vnet_tx_timeout,
	.ndo_change_mtu		= vnet_change_mtu,
	.ndo_start_xmit		= vnet_start_xmit,
};

B
Bill Pemberton 已提交
1063
static struct vnet *vnet_new(const u64 *local_mac)
1064 1065 1066 1067 1068 1069
{
	struct net_device *dev;
	struct vnet *vp;
	int err, i;

	dev = alloc_etherdev(sizeof(*vp));
1070
	if (!dev)
1071 1072 1073 1074 1075 1076 1077 1078
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < ETH_ALEN; i++)
		dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;

	vp = netdev_priv(dev);

	spin_lock_init(&vp->lock);
1079
	tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp);
1080 1081 1082 1083 1084 1085 1086 1087
	vp->dev = dev;

	INIT_LIST_HEAD(&vp->port_list);
	for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
		INIT_HLIST_HEAD(&vp->port_hash[i]);
	INIT_LIST_HEAD(&vp->list);
	vp->local_mac = *local_mac;

1088
	dev->netdev_ops = &vnet_ops;
1089 1090 1091 1092 1093
	dev->ethtool_ops = &vnet_ethtool_ops;
	dev->watchdog_timeo = VNET_TX_TIMEOUT;

	err = register_netdev(dev);
	if (err) {
1094
		pr_err("Cannot register net device, aborting\n");
1095 1096 1097
		goto err_out_free_dev;
	}

1098
	netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

	list_add(&vp->list, &vnet_list);

	return vp;

err_out_free_dev:
	free_netdev(dev);

	return ERR_PTR(err);
}

B
Bill Pemberton 已提交
1110
static struct vnet *vnet_find_or_create(const u64 *local_mac)
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
{
	struct vnet *iter, *vp;

	mutex_lock(&vnet_list_mutex);
	vp = NULL;
	list_for_each_entry(iter, &vnet_list, list) {
		if (iter->local_mac == *local_mac) {
			vp = iter;
			break;
		}
	}
	if (!vp)
		vp = vnet_new(local_mac);
	mutex_unlock(&vnet_list_mutex);

	return vp;
}

1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
static void vnet_cleanup(void)
{
	struct vnet *vp;
	struct net_device *dev;

	mutex_lock(&vnet_list_mutex);
	while (!list_empty(&vnet_list)) {
		vp = list_first_entry(&vnet_list, struct vnet, list);
		list_del(&vp->list);
		dev = vp->dev;
1139
		tasklet_kill(&vp->vnet_tx_wakeup);
1140 1141 1142 1143 1144 1145 1146 1147
		/* vio_unregister_driver() should have cleaned up port_list */
		BUG_ON(!list_empty(&vp->port_list));
		unregister_netdev(dev);
		free_netdev(dev);
	}
	mutex_unlock(&vnet_list_mutex);
}

1148 1149
static const char *local_mac_prop = "local-mac-address";

B
Bill Pemberton 已提交
1150
static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
						u64 port_node)
{
	const u64 *local_mac = NULL;
	u64 a;

	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(hp, a);
		const char *name;

		name = mdesc_get_property(hp, target, "name", NULL);
		if (!name || strcmp(name, "network"))
			continue;

		local_mac = mdesc_get_property(hp, target,
					       local_mac_prop, NULL);
		if (local_mac)
			break;
	}
	if (!local_mac)
		return ERR_PTR(-ENODEV);

	return vnet_find_or_create(local_mac);
}

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
static struct ldc_channel_config vnet_ldc_cfg = {
	.event		= vnet_event,
	.mtu		= 64,
	.mode		= LDC_MODE_UNRELIABLE,
};

static struct vio_driver_ops vnet_vio_ops = {
	.send_attr		= vnet_send_attr,
	.handle_attr		= vnet_handle_attr,
	.handshake_complete	= vnet_handshake_complete,
};

B
Bill Pemberton 已提交
1187
static void print_version(void)
1188
{
1189
	printk_once(KERN_INFO "%s", version);
1190 1191
}

1192 1193
const char *remote_macaddr_prop = "remote-mac-address";

1194
static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1195
{
1196
	struct mdesc_handle *hp;
1197 1198 1199 1200 1201 1202
	struct vnet_port *port;
	unsigned long flags;
	struct vnet *vp;
	const u64 *rmac;
	int len, i, err, switch_port;

1203
	print_version();
1204

1205 1206
	hp = mdesc_grab();

1207 1208
	vp = vnet_find_parent(hp, vdev->mp);
	if (IS_ERR(vp)) {
1209
		pr_err("Cannot find port parent vnet\n");
1210 1211 1212 1213
		err = PTR_ERR(vp);
		goto err_out_put_mdesc;
	}

1214 1215
	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
	err = -ENODEV;
1216
	if (!rmac) {
1217
		pr_err("Port lacks %s property\n", remote_macaddr_prop);
1218
		goto err_out_put_mdesc;
1219 1220 1221
	}

	port = kzalloc(sizeof(*port), GFP_KERNEL);
1222
	err = -ENOMEM;
1223
	if (!port)
1224
		goto err_out_put_mdesc;
1225 1226 1227 1228 1229 1230

	for (i = 0; i < ETH_ALEN; i++)
		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;

	port->vp = vp;

1231
	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
			      vnet_versions, ARRAY_SIZE(vnet_versions),
			      &vnet_vio_ops, vp->dev->name);
	if (err)
		goto err_out_free_port;

	err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
	if (err)
		goto err_out_free_port;

	err = vnet_port_alloc_tx_bufs(port);
	if (err)
		goto err_out_free_ldc;

	INIT_HLIST_NODE(&port->hash);
	INIT_LIST_HEAD(&port->list);

	switch_port = 0;
1249
	if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1250
		switch_port = 1;
1251
	port->switch_port = switch_port;
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262

	spin_lock_irqsave(&vp->lock, flags);
	if (switch_port)
		list_add(&port->list, &vp->port_list);
	else
		list_add_tail(&port->list, &vp->port_list);
	hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
	spin_unlock_irqrestore(&vp->lock, flags);

	dev_set_drvdata(&vdev->dev, port);

1263 1264
	pr_info("%s: PORT ( remote-mac %pM%s )\n",
		vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1265 1266 1267

	vio_port_up(&port->vio);

1268 1269
	mdesc_release(hp);

1270 1271 1272 1273 1274 1275 1276 1277
	return 0;

err_out_free_ldc:
	vio_ldc_free(&port->vio);

err_out_free_port:
	kfree(port);

1278 1279
err_out_put_mdesc:
	mdesc_release(hp);
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
	return err;
}

static int vnet_port_remove(struct vio_dev *vdev)
{
	struct vnet_port *port = dev_get_drvdata(&vdev->dev);

	if (port) {
		struct vnet *vp = port->vp;
		unsigned long flags;

		del_timer_sync(&port->vio.timer);

		spin_lock_irqsave(&vp->lock, flags);
		list_del(&port->list);
		hlist_del(&port->hash);
		spin_unlock_irqrestore(&vp->lock, flags);

		vnet_port_free_tx_bufs(port);
		vio_ldc_free(&port->vio);

		dev_set_drvdata(&vdev->dev, NULL);

		kfree(port);
1304

1305 1306 1307 1308
	}
	return 0;
}

1309
static const struct vio_device_id vnet_port_match[] = {
1310 1311 1312 1313 1314
	{
		.type = "vnet-port",
	},
	{},
};
1315
MODULE_DEVICE_TABLE(vio, vnet_port_match);
1316 1317 1318 1319 1320

static struct vio_driver vnet_port_driver = {
	.id_table	= vnet_port_match,
	.probe		= vnet_port_probe,
	.remove		= vnet_port_remove,
1321
	.name		= "vnet_port",
1322 1323 1324 1325
};

static int __init vnet_init(void)
{
1326
	return vio_register_driver(&vnet_port_driver);
1327 1328 1329 1330 1331
}

static void __exit vnet_exit(void)
{
	vio_unregister_driver(&vnet_port_driver);
1332
	vnet_cleanup();
1333 1334 1335 1336
}

module_init(vnet_init);
module_exit(vnet_exit);