/* 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 int handle_mcast(struct vnet_port *port, void *msgbuf) { struct vio_net_mcast_info *pkt = msgbuf; if (pkt->tag.stype != VIO_SUBTYPE_ACK) printk(KERN_ERR PFX "%s: Got unexpected MCAST reply " "[%02x:%02x:%04x:%08x]\n", port->vp->dev->name, pkt->tag.type, pkt->tag.stype, pkt->tag.stype_env, pkt->tag.sid); 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) { if (msgbuf.tag.stype_env == VNET_MCAST_INFO) err = handle_mcast(port, &msgbuf); else 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 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) { if (!memcmp(m->addr, addr, ETH_ALEN)) return m; } return NULL; } static void __update_mc_list(struct vnet *vp, struct net_device *dev) { struct dev_addr_list *p; for (p = dev->mc_list; p; p = p->next) { struct vnet_mcast_entry *m; m = __vnet_mc_find(vp, p->dmi_addr); if (m) { m->hit = 1; continue; } if (!m) { m = kzalloc(sizeof(*m), GFP_ATOMIC); if (!m) continue; memcpy(m->addr, p->dmi_addr, ETH_ALEN); 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)); } } static void vnet_set_rx_mode(struct net_device *dev) { 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); } 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, }; 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 __devinit 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; DECLARE_MAC_BUF(mac); 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; port->switch_port = switch_port; 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 %s%s )\n", vp->dev->name, print_mac(mac, port->raddr), switch_port ? " switch-port" : ""); 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_port_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);