--- /dev/null
+/* sunvnet.c: Sun LDOM Virtual Network Driver.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+
+#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>
+
+#include <asm/vio.h>
+#include <asm/ldc.h>
+
+#include "sunvnet.h"
+
+#define DRV_MODULE_NAME "sunvnet"
+#define PFX DRV_MODULE_NAME ": "
+#define DRV_MODULE_VERSION "1.0"
+#define DRV_MODULE_RELDATE "June 25, 2007"
+
+static char version[] __devinitdata =
+ 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);
+
+/* 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;
+
+ printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
+ pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
+ printk(KERN_ERR PFX "Resetting connection.\n");
+
+ 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;
+
+ 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;
+ } 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);
+
+ viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%lx:%lx]\n",
+ 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;
+
+ viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016lx] rcv_nxt[%016lx]\n",
+ 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)) {
+ printk(KERN_ERR PFX "RX out of sequence seq[0x%lx] "
+ "rcv_nxt[0x%lx]\n", pkt->seq, dr->rcv_nxt);
+ 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;
+}
+
+static void maybe_tx_wakeup(struct vnet *vp)
+{
+ 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);
+
+ return;
+ }
+
+ if (unlikely(event != LDC_EVENT_DATA_READY)) {
+ printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
+ 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) {
+ err = vio_control_pkt_engine(vio, &msgbuf);
+ if (err)
+ break;
+ } else {
+ err = vnet_handle_unknown(port, &msgbuf);
+ }
+ if (err == -ECONNRESET)
+ break;
+ }
+ spin_unlock(&vio->lock);
+ if (unlikely(tx_wakeup && err != -ECONNRESET))
+ maybe_tx_wakeup(port->vp);
+ 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;
+
+ 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;
+ } while (err == -EAGAIN);
+
+ return err;
+}
+
+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 hlist_node *n;
+ struct vnet_port *port;
+
+ hlist_for_each_entry(port, n, hp, hash) {
+ if (!compare_ether_addr(port->raddr, skb->data))
+ return port;
+ }
+ port = NULL;
+ if (!list_empty(&vp->port_list))
+ port = list_entry(vp->port_list.next, struct vnet_port, list);
+
+ return port;
+}
+
+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. */
+ printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
+ "queue awake!\n", dev->name);
+ 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);
+ }
+
+ d->hdr.ack = VIO_ACK_ENABLE;
+ 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)) {
+ printk(KERN_INFO PFX "%s: TX trigger error %d\n",
+ dev->name, err);
+ 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);
+
+ dev->trans_start = jiffies;
+ 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;
+}
+
+static void vnet_set_rx_mode(struct net_device *dev)
+{
+ /* XXX Implement multicast support XXX */
+}
+
+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)
+{
+ strcpy(info->driver, DRV_MODULE_NAME);
+ strcpy(info->version, DRV_MODULE_VERSION);
+}
+
+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,
+ .get_perm_addr = ethtool_op_get_perm_addr,
+};
+
+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;
+ }
+}
+
+static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
+{
+ 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;
+ if (!buf) {
+ printk(KERN_ERR "TX buffer allocation failure\n");
+ goto err_out;
+ }
+ err = -EFAULT;
+ if ((unsigned long)buf & (8UL - 1)) {
+ printk(KERN_ERR "TX buffer misaligned\n");
+ 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;
+}
+
+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,
+};
+
+const char *remote_macaddr_prop = "remote-mac-address";
+
+static int __devinit vnet_port_probe(struct vio_dev *vdev,
+ const struct vio_device_id *id)
+{
+ struct mdesc_node *endp;
+ struct vnet_port *port;
+ unsigned long flags;
+ struct vnet *vp;
+ const u64 *rmac;
+ int len, i, err, switch_port;
+
+ vp = dev_get_drvdata(vdev->dev.parent);
+ if (!vp) {
+ printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
+ return -ENODEV;
+ }
+
+ rmac = md_get_property(vdev->mp, remote_macaddr_prop, &len);
+ if (!rmac) {
+ printk(KERN_ERR PFX "Port lacks %s property.\n",
+ remote_macaddr_prop);
+ return -ENODEV;
+ }
+
+ endp = vio_find_endpoint(vdev);
+ if (!endp) {
+ printk(KERN_ERR PFX "Port lacks channel-endpoint.\n");
+ return -ENODEV;
+ }
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port) {
+ printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < ETH_ALEN; i++)
+ port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
+
+ port->vp = vp;
+
+ err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, endp,
+ 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;
+ if (md_get_property(vdev->mp, "switch-port", NULL) != NULL)
+ switch_port = 1;
+
+ 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);
+
+ printk(KERN_INFO "%s: PORT ( remote-mac ", vp->dev->name);
+ for (i = 0; i < 6; i++)
+ printk("%2.2x%c", port->raddr[i], i == 5 ? ' ' : ':');
+ if (switch_port)
+ printk("switch-port ");
+ printk(")\n");
+
+ vio_port_up(&port->vio);
+
+ return 0;
+
+err_out_free_ldc:
+ vio_ldc_free(&port->vio);
+
+err_out_free_port:
+ kfree(port);
+
+ 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);
+ }
+ return 0;
+}
+
+static struct vio_device_id vnet_port_match[] = {
+ {
+ .type = "vnet-port",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(vio, vnet_match);
+
+static struct vio_driver vnet_port_driver = {
+ .id_table = vnet_port_match,
+ .probe = vnet_port_probe,
+ .remove = vnet_port_remove,
+ .driver = {
+ .name = "vnet_port",
+ .owner = THIS_MODULE,
+ }
+};
+
+const char *local_mac_prop = "local-mac-address";
+
+static int __devinit vnet_probe(struct vio_dev *vdev,
+ const struct vio_device_id *id)
+{
+ static int vnet_version_printed;
+ struct net_device *dev;
+ struct vnet *vp;
+ const u64 *mac;
+ int err, i, len;
+
+ if (vnet_version_printed++ == 0)
+ printk(KERN_INFO "%s", version);
+
+ mac = md_get_property(vdev->mp, local_mac_prop, &len);
+ if (!mac) {
+ printk(KERN_ERR PFX "vnet lacks %s property.\n",
+ local_mac_prop);
+ err = -ENODEV;
+ goto err_out;
+ }
+
+ dev = alloc_etherdev(sizeof(*vp));
+ if (!dev) {
+ printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ for (i = 0; i < ETH_ALEN; i++)
+ dev->dev_addr[i] = (*mac >> (5 - i) * 8) & 0xff;
+
+ memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
+
+ SET_NETDEV_DEV(dev, &vdev->dev);
+
+ vp = netdev_priv(dev);
+
+ spin_lock_init(&vp->lock);
+ vp->dev = dev;
+ vp->vdev = vdev;
+
+ INIT_LIST_HEAD(&vp->port_list);
+ for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&vp->port_hash[i]);
+
+ dev->open = vnet_open;
+ dev->stop = vnet_close;
+ dev->set_multicast_list = vnet_set_rx_mode;
+ dev->set_mac_address = vnet_set_mac_addr;
+ dev->tx_timeout = vnet_tx_timeout;
+ dev->ethtool_ops = &vnet_ethtool_ops;
+ dev->watchdog_timeo = VNET_TX_TIMEOUT;
+ dev->change_mtu = vnet_change_mtu;
+ dev->hard_start_xmit = vnet_start_xmit;
+
+ err = register_netdev(dev);
+ if (err) {
+ printk(KERN_ERR PFX "Cannot register net device, "
+ "aborting.\n");
+ goto err_out_free_dev;
+ }
+
+ printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name);
+
+ for (i = 0; i < 6; i++)
+ printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
+
+ dev_set_drvdata(&vdev->dev, vp);
+
+ return 0;
+
+err_out_free_dev:
+ free_netdev(dev);
+
+err_out:
+ return err;
+}
+
+static int vnet_remove(struct vio_dev *vdev)
+{
+
+ struct vnet *vp = dev_get_drvdata(&vdev->dev);
+
+ if (vp) {
+ /* XXX unregister port, or at least check XXX */
+ unregister_netdevice(vp->dev);
+ dev_set_drvdata(&vdev->dev, NULL);
+ }
+ return 0;
+}
+
+static struct vio_device_id vnet_match[] = {
+ {
+ .type = "network",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(vio, vnet_match);
+
+static struct vio_driver vnet_driver = {
+ .id_table = vnet_match,
+ .probe = vnet_probe,
+ .remove = vnet_remove,
+ .driver = {
+ .name = "vnet",
+ .owner = THIS_MODULE,
+ }
+};
+
+static int __init vnet_init(void)
+{
+ int err = vio_register_driver(&vnet_driver);
+
+ if (!err) {
+ err = vio_register_driver(&vnet_port_driver);
+ if (err)
+ vio_unregister_driver(&vnet_driver);
+ }
+
+ return err;
+}
+
+static void __exit vnet_exit(void)
+{
+ vio_unregister_driver(&vnet_port_driver);
+ vio_unregister_driver(&vnet_driver);
+}
+
+module_init(vnet_init);
+module_exit(vnet_exit);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff