diff options
Diffstat (limited to 'drivers/net/sunvnet.c')
| -rw-r--r-- | drivers/net/sunvnet.c | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/drivers/net/sunvnet.c b/drivers/net/sunvnet.c new file mode 100644 index 00000000000..b801e3b3a11 --- /dev/null +++ b/drivers/net/sunvnet.c @@ -0,0 +1,1162 @@ +/* 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 <linux/mutex.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); + + if (event == LDC_EVENT_RESET) + vio_port_up(vio); + 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 LIST_HEAD(vnet_list); +static DEFINE_MUTEX(vnet_list_mutex); + +static struct vnet * __devinit vnet_new(const u64 *local_mac) +{ + struct net_device *dev; + struct vnet *vp; + int err, i; + + dev = alloc_etherdev(sizeof(*vp)); + if (!dev) { + printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n"); + return ERR_PTR(-ENOMEM); + } + + for (i = 0; i < ETH_ALEN; i++) + dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; + + memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); + + vp = netdev_priv(dev); + + spin_lock_init(&vp->lock); + 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; + + 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' : ':'); + + list_add(&vp->list, &vnet_list); + + return vp; + +err_out_free_dev: + free_netdev(dev); + + return ERR_PTR(err); +} + +static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac) +{ + 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; +} + +static const char *local_mac_prop = "local-mac-address"; + +static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp, + 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); +} + +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, +}; + +static void print_version(void) +{ + static int version_printed; + + if (version_printed++ == 0) + printk(KERN_INFO "%s", version); +} + +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_handle *hp; + struct vnet_port *port; + unsigned long flags; + struct vnet *vp; + const u64 *rmac; + int len, i, err, switch_port; + + print_version(); + + hp = mdesc_grab(); + + vp = vnet_find_parent(hp, vdev->mp); + if (IS_ERR(vp)) { + printk(KERN_ERR PFX "Cannot find port parent vnet.\n"); + err = PTR_ERR(vp); + goto err_out_put_mdesc; + } + + rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); + err = -ENODEV; + if (!rmac) { + printk(KERN_ERR PFX "Port lacks %s property.\n", + remote_macaddr_prop); + goto err_out_put_mdesc; + } + + port = kzalloc(sizeof(*port), GFP_KERNEL); + err = -ENOMEM; + if (!port) { + printk(KERN_ERR PFX "Cannot allocate vnet_port.\n"); + goto err_out_put_mdesc; + } + + 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, + 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 (mdesc_get_property(hp, 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); + + mdesc_release(hp); + + return 0; + +err_out_free_ldc: + vio_ldc_free(&port->vio); + +err_out_free_port: + kfree(port); + +err_out_put_mdesc: + mdesc_release(hp); + 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, + } +}; + +static int __init vnet_init(void) +{ + return vio_register_driver(&vnet_port_driver); +} + +static void __exit vnet_exit(void) +{ + vio_unregister_driver(&vnet_port_driver); +} + +module_init(vnet_init); +module_exit(vnet_exit); |