[PATCH 4/4] SGI Altix cross partition functionality (1st revision)

Dean Nelson
2004-08-24T18:27:46Z

This patch contains the cross partition pseudo-ethernet driver (XPNET)
functional support module.

Signed-off-by: Dean Nelson <dcn@sgi.com>

Index: bk-linux-2.6/arch/ia64/Kconfig
=================================--- bk-linux-2.6.orig/arch/ia64/Kconfig 2004-08-24 07:36:43.000000000 -0500
+++ bk-linux-2.6/arch/ia64/Kconfig 2004-08-24 07:38:23.000000000 -0500
@@ -199,6 +199,16 @@
this feature will allow limited communication between
those System Images without allowing write access.

+config IA64_SGI_SN_XPNET
+ tristate "SGI DMA pseudo-ethernet driver"
+ depends on IA64_SGI_SN_XPC
+ help
+ An SGI machine can be divided into multiple Single System
+ Images which act independently of each other and have
+ hardware based memory protection from the others. Enabling
+ this feature will produce a network adapter that can be
+ used to communicate directly between SSIs.
+
config IA64_SGI_SN_SIM
bool "SGI Medusa Simulator Support"
depends on IA64_SGI_SN2
Index: bk-linux-2.6/arch/ia64/sn/kernel/Makefile
=================================--- bk-linux-2.6.orig/arch/ia64/sn/kernel/Makefile 2004-08-24 07:38:21.000000000 -0500
+++ bk-linux-2.6/arch/ia64/sn/kernel/Makefile 2004-08-24 07:38:23.000000000 -0500
@@ -13,3 +13,4 @@
xp-y := xp_main.o xp_kdb.o xp_nofault.o
obj-$(CONFIG_IA64_SGI_SN_XPC) += xpc.o
xpc-y := xpc_main.o xpc_kdb.o xpc_channel.o xpc_partition.o
+obj-$(CONFIG_IA64_SGI_SN_XPNET) += xpnet.o
Index: bk-linux-2.6/arch/ia64/sn/kernel/xpnet.c
=================================--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ bk-linux-2.6/arch/ia64/sn/kernel/xpnet.c 2004-08-24 09:18:54.000000000 -0500
@@ -0,0 +1,714 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999,2001-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+/*
+ * Cross Partition Network Interface (XPNET) support
+ *
+ * XPNET provides a virtual network layered on top of the Cross
+ * Partition communication layer.
+ *
+ * XPNET provides direct point-to-point and broadcast-like support
+ * for an ethernet-like device. The ethernet broadcast medium is
+ * replaced with a point-to-point message structure which passes
+ * pointers to a DMA-capable block that a remote partition should
+ * retrieve and pass to the upper level networking layer.
+ *
+ */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/io.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/types.h>
+#include <asm/atomic.h>
+#include <asm/sn/xp.h>
+
+
+/*
+ * The message payload transferred by XPC.
+ *
+ * buf_pa is the physical address where the DMA should pull from.
+ *
+ * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
+ * cacheline boundary. To accomplish this, we record the number of
+ * bytes from the beginning of the first cacheline to the first useful
+ * byte of the skb (leadin_ignore) and the number of bytes from the
+ * last useful byte of the skb to the end of the last cacheline
+ * (tailout_ignore).
+ *
+ * size is the number of bytes to transfer which includes the skb->len
+ * (useful bytes of the senders skb) plus the leadin and tailout
+ */
+struct xpnet_message {
+ u16 version; /* Version for this message */
+ u16 embedded_bytes; /* #of bytes embedded in XPC message */
+ u32 magic; /* Special number indicating this is xpnet */
+ u64 buf_pa; /* phys address of buffer to retrieve */
+ u32 size; /* #of bytes in buffer */
+ u8 leadin_ignore; /* #of bytes to ignore at the beginning */
+ u8 tailout_ignore; /* #of bytes to ignore at the end */
+ unsigned char data; /* body of small packets */
+};
+
+/*
+ * Determine the size of our message, the cacheline aligned size,
+ * and then the number of message will request from XPC.
+ *
+ * XPC expects each message to exist in an individual cacheline.
+ */
+#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET)
+#define XPNET_MSG_DATA_MAX \
+ (XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data))
+#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE))
+#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE)
+
+
+#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1)
+#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1)
+
+/*
+ * Version number of XPNET implementation. XPNET can always talk to versions
+ * with same major #, and never talk to versions with a different version.
+ */
+#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor))
+#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4)
+#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf)
+
+#define XPNET_VERSION _XPNET_VERSION(1,0) /* version 1.0 */
+#define XPNET_VERSION_EMBED _XPNET_VERSION(1,1) /* version 1.1 */
+#define XPNET_MAGIC 0x88786984 /* "XNET" */
+
+#define XPNET_VALID_MSG(_m) \
+ ((XPNET_VERSION_MAJOR(_m->version) = XPNET_VERSION_MAJOR(XPNET_VERSION)) \
+ && (msg->magic = XPNET_MAGIC))
+
+#define XPNET_DEVICE_NAME "xp0"
+
+
+/*
+ * When messages are queued with xpc_send_notify, a kmalloc'd buffer
+ * of the following type is passed as a notification cookie. When the
+ * notification function is called, we use the cookie to decide
+ * whether all outstanding message sends have completed. The skb can
+ * then be released.
+ */
+struct xpnet_pending_msg {
+ struct list_head free_list;
+ struct sk_buff *skb;
+ atomic_t use_count;
+};
+
+/* driver specific structure pointed to by the device structure */
+struct xpnet_dev_private {
+ struct net_device_stats stats;
+};
+
+struct net_device *xpnet_device;
+
+/*
+ * When we are notified of other partitions activating, we add them to
+ * our bitmask of partitions to which we broadcast.
+ */
+static u64 xpnet_broadcast_partitions;
+/* protect above */
+static spinlock_t xpnet_broadcast_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ * Since the Block Transfer Engine (BTE) is being used for the transfer
+ * and it relies upon cache-line size transfers, we need to reserve at
+ * least one cache-line for head and tail alignment. The BTE is
+ * limited to 8MB transfers.
+ *
+ * Testing has shown that changing MTU to greater than 64KB has no effect
+ * on TCP as the two sides negotiate a Max Segment Size that is limited
+ * to 64K. Other protocols May use packets greater than this, but for
+ * now, the default is 64KB.
+ */
+#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
+/* 32KB has been determined to be the ideal */
+#define XPNET_DEF_MTU (0x8000UL)
+
+
+/*
+ * The partition id is encapsulated in the MAC address. The following
+ * define locates the octet the partid is in.
+ */
+#define XPNET_PARTID_OCTET 1
+#define XPNET_LICENSE_OCTET 2
+
+
+/*
+ * Define the XPNET debug device structure that is to be used with dev_dbg(),
+ * dev_err(), dev_warn(), and dev_info().
+ */
+struct device_driver xpnet_dbg_name = {
+ .name = "xpnet"
+};
+
+struct device xpnet_dbg_subname = {
+ .bus_id = {0}, /* set to "" */
+ .driver = &xpnet_dbg_name
+};
+
+struct device *xpnet = &xpnet_dbg_subname;
+
+/*
+ * Packet was recevied by XPC and forwarded to us.
+ */
+static void
+xpnet_receive(partid_t partid, int channel, struct xpnet_message *msg)
+{
+ struct sk_buff *skb;
+ bte_result_t bret;
+ struct xpnet_dev_private *priv =
+ (struct xpnet_dev_private *) xpnet_device->priv;
+
+
+ if (!XPNET_VALID_MSG(msg)) {
+ /*
+ * Packet with a different XPC version. Ignore.
+ */
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+ dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
+ msg->leadin_ignore, msg->tailout_ignore);
+
+
+ /* reserve an extra cache line */
+ skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
+ if (!skb) {
+ dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
+ msg->size + L1_CACHE_BYTES);
+
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+
+ /*
+ * The allocated skb has some reserved space.
+ * In order to use bte_copy, we need to get the
+ * skb->data pointer moved forward.
+ */
+ skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
+ (L1_CACHE_BYTES - 1)) +
+ msg->leadin_ignore));
+
+ /*
+ * Update the tail pointer to indicate data actually
+ * transferred.
+ */
+ skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
+
+ /*
+ * Move the data over from the the other side.
+ */
+ if ((XPNET_VERSION_MINOR(msg->version) = 1) &&
+ (msg->embedded_bytes != 0)) {
+ dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
+ "%lu)\n", skb->data, &msg->data,
+ (size_t) msg->embedded_bytes);
+
+ memcpy(skb->data, &msg->data, (size_t) msg->embedded_bytes);
+ } else {
+ dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
+ "bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
+ (void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ msg->size);
+
+ bret = bte_copy(msg->buf_pa,
+ __pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+
+ if (bret != BTE_SUCCESS) {
+ // >>> Need better way of cleaning skb. Currently skb
+ // >>> appears in_use and we can't just call
+ // >>> dev_kfree_skb.
+ dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
+ "error=0x%x\n", (void *)msg->buf_pa,
+ (void *)__pa((u64)skb->data &
+ ~(L1_CACHE_BYTES - 1)),
+ msg->size, bret);
+
+ xpc_received(partid, channel, (void *) msg);
+
+ priv->stats.rx_errors++;
+
+ return;
+ }
+ }
+
+ dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+ "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+ (void *) skb->data, (void *) skb->tail, (void *) skb->end,
+ skb->len);
+
+ skb->dev = xpnet_device;
+ skb->protocol = eth_type_trans(skb, xpnet_device);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ dev_dbg(xpnet, "passing skb to network layer; \n\tskb->head=0x%p "
+ "skb->data=0x%p skb->tail=0x%p skb->end=0x%p skb->len=%d\n",
+ (void *) skb->head, (void *) skb->data, (void *) skb->tail,
+ (void *) skb->end, skb->len);
+
+
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += skb->len + ETH_HLEN;
+
+ netif_rx_ni(skb);
+ xpc_received(partid, channel, (void *) msg);
+}
+
+
+/*
+ * This is the handler which XPC calls during any sort of change in
+ * state or message reception on a connection.
+ */
+static void
+xpnet_connection_activity(enum xpc_retval reason, partid_t partid, int channel,
+ void *data, void *key)
+{
+ long bp;
+
+
+ DBUG_ON(partid <= 0 || partid >= MAX_PARTITIONS);
+ DBUG_ON(channel != XPC_NET_CHANNEL);
+
+ switch(reason) {
+ case xpcMsgReceived: /* message received */
+ DBUG_ON(data = NULL);
+
+ xpnet_receive(partid, channel, (struct xpnet_message *) data);
+ break;
+
+ case xpcConnected: /* connection completed to a partition */
+ spin_lock_bh(&xpnet_broadcast_lock);
+ xpnet_broadcast_partitions |= 1UL << (partid -1 );
+ bp = xpnet_broadcast_partitions;
+ spin_unlock_bh(&xpnet_broadcast_lock);
+
+ netif_carrier_on(xpnet_device);
+
+ dev_dbg(xpnet, "%s connection created to partition %d; "
+ "xpnet_broadcast_partitions=0x%lx\n",
+ xpnet_device->name, partid, bp);
+ break;
+
+ default:
+ spin_lock_bh(&xpnet_broadcast_lock);
+ xpnet_broadcast_partitions &= ~(1UL << (partid -1 ));
+ bp = xpnet_broadcast_partitions;
+ spin_unlock_bh(&xpnet_broadcast_lock);
+
+ if (bp = 0) {
+ netif_carrier_off(xpnet_device);
+ }
+
+ dev_dbg(xpnet, "%s disconnected from partition %d; "
+ "xpnet_broadcast_partitions=0x%lx\n",
+ xpnet_device->name, partid, bp);
+ break;
+
+ }
+}
+
+
+static int
+xpnet_dev_open(struct net_device *dev)
+{
+ enum xpc_retval ret;
+
+
+ dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %d, "
+ "%d)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
+ XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS,
+ XPNET_MAX_IDLE_KTHREADS);
+
+ ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
+ XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
+ XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
+ if (ret != xpcSuccess) {
+ dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
+ "ret=%d\n", dev->name, ret);
+
+ return -ENOMEM;
+ }
+
+ dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
+
+ return 0;
+}
+
+
+static int
+xpnet_dev_stop(struct net_device *dev)
+{
+ xpc_disconnect(XPC_NET_CHANNEL);
+
+ dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
+
+ return 0;
+}
+
+
+static int
+xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+ /* 68 comes from min TCP+IP+MAC header */
+ if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
+ dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
+ "between 68 and %ld\n", dev->name, new_mtu,
+ XPNET_MAX_MTU);
+ return -EINVAL;
+ }
+
+ dev->mtu = new_mtu;
+ dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
+ return 0;
+}
+
+
+/*
+ * Required for the net_device structure.
+ */
+static int
+xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map)
+{
+ return 0;
+}
+
+
+/*
+ * Return statistics to the caller.
+ */
+static struct net_device_stats *
+xpnet_dev_get_stats(struct net_device *dev)
+{
+ struct xpnet_dev_private *priv;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+ return &priv->stats;
+}
+
+
+/*
+ * Notification that the other end has received the message and
+ * DMA'd the skb information. At this point, they are done with
+ * our side. When all recipients are done processing, we
+ * release the skb and then release our pending message structure.
+ */
+static void
+xpnet_send_completed(enum xpc_retval reason, partid_t partid, int channel,
+ void *__qm)
+{
+ struct xpnet_pending_msg *queued_msg + (struct xpnet_pending_msg *) __qm;
+
+
+ DBUG_ON(queued_msg = NULL);
+
+ dev_dbg(xpnet, "message to %d notified with reason %d\n",
+ partid, reason);
+
+ if (atomic_dec_return(&queued_msg->use_count) = 0) {
+ dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
+ (void *) queued_msg->skb->head);
+
+ dev_kfree_skb_any(queued_msg->skb);
+ kfree(queued_msg);
+ }
+}
+
+
+/*
+ * Network layer has formatted a packet (skb) and is ready to place it
+ * "on the wire". Prepare and send an xpnet_message to all partitions
+ * which have connected with us and are targets of this packet.
+ *
+ * MAC-NOTE: For the XPNET driver, the MAC address contains the
+ * destination partition_id. If the destination partition id word
+ * is 0xff, this packet is to broadcast to all partitions.
+ */
+static int
+xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct xpnet_pending_msg *queued_msg;
+ enum xpc_retval ret;
+ struct xpnet_message *msg;
+ u64 start_addr, end_addr;
+ long dp;
+ u8 second_mac_octet;
+ partid_t dest_partid;
+ struct xpnet_dev_private *priv;
+ u16 embedded_bytes;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+
+ dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+ "skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+ (void *) skb->data, (void *) skb->tail, (void *) skb->end,
+ skb->len);
+
+
+ /*
+ * The xpnet_pending_msg tracks how many outstanding
+ * xpc_send_notifies are relying on this skb. When none
+ * remain, release the skb.
+ */
+ queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
+ if (queued_msg = NULL) {
+ dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
+ "packet\n", sizeof(struct xpnet_pending_msg));
+
+ priv->stats.tx_errors++;
+
+ return -ENOMEM;
+ }
+
+
+ /* get the beginning of the first cacheline and end of last */
+ start_addr = ((u64) skb->data & ~(L1_CACHE_BYTES - 1));
+ end_addr = L1_CACHE_ALIGN((u64) skb->tail);
+
+ /* calculate how many bytes to embed in the XPC message */
+ embedded_bytes = 0;
+ if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
+ /* skb->data does fit so embed */
+ embedded_bytes = skb->len;
+ }
+
+
+ /*
+ * Since the send occurs asynchronously, we set the count to one
+ * and begin sending. Any sends that happen to complete before
+ * we are done sending will not free the skb. We will be left
+ * with that task during exit. This also handles the case of
+ * a packet destined for a partition which is no longer up.
+ */
+ atomic_set(&queued_msg->use_count, 1);
+ queued_msg->skb = skb;
+
+
+ second_mac_octet = skb->data[XPNET_PARTID_OCTET];
+ if (second_mac_octet = 0xff) {
+ /* we are being asked to broadcast to all partitions */
+ dp = xpnet_broadcast_partitions;
+ } else if (second_mac_octet != 0) {
+ dp = xpnet_broadcast_partitions &
+ (1UL << (second_mac_octet - 1));
+ } else {
+ /* 0 is an invalid partid. Ignore */
+ dp = 0;
+ }
+ dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp);
+
+ /*
+ * If we wanted to allow promiscous mode to work like an
+ * unswitched network, this would be a good point to OR in a
+ * mask of partitions which should be receiving all packets.
+ */
+
+ /*
+ * Main send loop.
+ */
+ for (dest_partid = 1; dp && dest_partid < MAX_PARTITIONS;
+ dest_partid++) {
+
+
+ if (!(dp & (1UL << (dest_partid - 1)))) {
+ /* not destined for this partition */
+ continue;
+ }
+
+ /* remove this partition from the destinations mask */
+ dp &= ~(1UL << (dest_partid - 1));
+
+
+ /* found a partition to send to */
+
+ ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL,
+ XPC_NOWAIT, (void **)&msg);
+ if (unlikely(ret != xpcSuccess)) {
+ continue;
+ }
+
+ msg->embedded_bytes = embedded_bytes;
+ if (unlikely(embedded_bytes != 0)) {
+ msg->version = XPNET_VERSION_EMBED;
+ dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
+ &msg->data, skb->data, (size_t) embedded_bytes);
+ memcpy(&msg->data, skb->data, (size_t) embedded_bytes);
+ } else {
+ msg->version = XPNET_VERSION;
+ }
+ msg->magic = XPNET_MAGIC;
+ msg->size = end_addr - start_addr;
+ msg->leadin_ignore = (u64) skb->data - start_addr;
+ msg->tailout_ignore = end_addr - (u64) skb->tail;
+ msg->buf_pa = __pa(start_addr);
+
+ dev_dbg(xpnet, "sending XPC message to %d:%d\nmsg->buf_pa="
+ "0x%lx, msg->size=%u, msg->leadin_ignore=%u, "
+ "msg->tailout_ignore=%u\n", dest_partid,
+ XPC_NET_CHANNEL, msg->buf_pa, msg->size,
+ msg->leadin_ignore, msg->tailout_ignore);
+
+
+ atomic_inc(&queued_msg->use_count);
+
+ ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg,
+ xpnet_send_completed, queued_msg);
+ if (unlikely(ret != xpcSuccess)) {
+ atomic_dec(&queued_msg->use_count);
+ continue;
+ }
+
+ }
+
+ if (atomic_dec_return(&queued_msg->use_count) = 0) {
+ dev_dbg(xpnet, "no partitions to receive packet destined for "
+ "%d\n", dest_partid);
+
+
+ dev_kfree_skb(skb);
+ kfree(queued_msg);
+ }
+
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len;
+
+ return 0;
+}
+
+
+/*
+ * Deal with transmit timeouts coming from the network layer.
+ */
+static void
+xpnet_dev_tx_timeout (struct net_device *dev)
+{
+ struct xpnet_dev_private *priv;
+
+
+ priv = (struct xpnet_dev_private *) dev->priv;
+
+ priv->stats.tx_errors++;
+ return;
+}
+
+
+static int __init
+xpnet_init(void)
+{
+ int i;
+ u32 license_num;
+ int result = -ENOMEM;
+
+
+ dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
+
+ /*
+ * use ether_setup() to init the majority of our device
+ * structure and then override the necessary pieces.
+ */
+ xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private),
+ XPNET_DEVICE_NAME, ether_setup);
+ if (xpnet_device = NULL) {
+ return -ENOMEM;
+ }
+
+ netif_carrier_off(xpnet_device);
+
+ xpnet_device->mtu = XPNET_DEF_MTU;
+ xpnet_device->change_mtu = xpnet_dev_change_mtu;
+ xpnet_device->open = xpnet_dev_open;
+ xpnet_device->get_stats = xpnet_dev_get_stats;
+ xpnet_device->stop = xpnet_dev_stop;
+ xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit;
+ xpnet_device->tx_timeout = xpnet_dev_tx_timeout;
+ xpnet_device->set_config = xpnet_dev_set_config;
+
+ /*
+ * Multicast assumes the LSB of the first octet is set for multicast
+ * MAC addresses. We chose the first octet of the MAC to be unlikely
+ * to collide with any vendor's officially issued MAC.
+ */
+ xpnet_device->dev_addr[0] = 0xfe;
+ xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_local_partid();
+ license_num = sn_partition_serial_number_val();
+ for (i = 3; i >= 0; i--) {
+ xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] + license_num & 0xff;
+ license_num = license_num >> 8;
+ }
+
+ /*
+ * ether_setup() sets this to a multicast device. We are
+ * really not supporting multicast at this time.
+ */
+ xpnet_device->flags &= ~IFF_MULTICAST;
+
+ /*
+ * No need to checksum as it is a DMA transfer. The BTE will
+ * report an error if the data is not retrievable and the
+ * packet will be dropped.
+ */
+ xpnet_device->features = NETIF_F_NO_CSUM | NETIF_F_HIGHDMA;
+
+ result = register_netdev(xpnet_device);
+ if (result != 0) {
+ free_netdev(xpnet_device);
+ }
+
+ return result;
+}
+module_init(xpnet_init);
+
+
+static void __exit
+xpnet_exit(void)
+{
+ dev_info(xpnet, "unregistering network device %s\n",
+ xpnet_device[0].name);
+
+ unregister_netdev(xpnet_device);
+
+ free_netdev(xpnet_device);
+}
+module_exit(xpnet_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
+MODULE_LICENSE("GPL");
+