drivers/net/tile/: on-chip network drivers for the tile architecture

This change adds the first network driver for the tile architecture,
supporting the on-chip XGBE and GBE shims.

The infrastructure is present for the TILE-Gx networking drivers (another
three source files in the new directory) but for now the the actual
tilegx sources are waiting on releasing hardware to initial customers.

Note that arch/tile/include/hv/* are "upstream" headers from the
Tilera hypervisor and will probably benefit less from LKML review.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

4 files changed, 2429 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f6668cdaac85..43db398437b7 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2945,6 +2945,18 @@ source "drivers/s390/net/Kconfig"
 
 source "drivers/net/caif/Kconfig"
 
+config TILE_NET
+	tristate "Tilera GBE/XGBE network driver support"
+	depends on TILE
+	default y
+	select CRC32
+	help
+	  This is a standard Linux network device driver for the
+	  on-chip Tilera Gigabit Ethernet and XAUI interfaces.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called tile_net.
+
 config XEN_NETDEV_FRONTEND
 	tristate "Xen network device frontend driver"
 	depends on XEN
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 652fc6b98039..b90738d13994 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -301,3 +301,4 @@ obj-$(CONFIG_CAIF) += caif/
 
 obj-$(CONFIG_OCTEON_MGMT_ETHERNET) += octeon/
 obj-$(CONFIG_PCH_GBE) += pch_gbe/
+obj-$(CONFIG_TILE_NET) += tile/
diff --git a/drivers/net/tile/Makefile b/drivers/net/tile/Makefile
new file mode 100644
index 000000000000..f634f142cab4
--- /dev/null
+++ b/drivers/net/tile/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the TILE on-chip networking support.
+#
+
+obj-$(CONFIG_TILE_NET) += tile_net.o
+ifdef CONFIG_TILEGX
+tile_net-objs := tilegx.o mpipe.o iorpc_mpipe.o dma_queue.o
+else
+tile_net-objs := tilepro.o
+endif
diff --git a/drivers/net/tile/tilepro.c b/drivers/net/tile/tilepro.c
new file mode 100644
index 000000000000..0e6bac5ec65b
--- /dev/null
+++ b/drivers/net/tile/tilepro.c
@@ -0,0 +1,2406 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>      /* printk() */
+#include <linux/slab.h>        /* kmalloc() */
+#include <linux/errno.h>       /* error codes */
+#include <linux/types.h>       /* size_t */
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/netdevice.h>   /* struct device, and other headers */
+#include <linux/etherdevice.h> /* eth_type_trans */
+#include <linux/skbuff.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/hugetlb.h>
+#include <linux/in6.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+#include <asm/checksum.h>
+#include <asm/homecache.h>
+
+#include <hv/drv_xgbe_intf.h>
+#include <hv/drv_xgbe_impl.h>
+#include <hv/hypervisor.h>
+#include <hv/netio_intf.h>
+
+/* For TSO */
+#include <linux/ip.h>
+#include <linux/tcp.h>
+
+
+/* There is no singlethread_cpu, so schedule work on the current cpu. */
+#define singlethread_cpu -1
+
+
+/*
+ * First, "tile_net_init_module()" initializes all four "devices" which
+ * can be used by linux.
+ *
+ * Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes
+ * the network cpus, then uses "tile_net_open_aux()" to initialize
+ * LIPP/LEPP, and then uses "tile_net_open_inner()" to register all
+ * the tiles, provide buffers to LIPP, allow ingress to start, and
+ * turn on hypervisor interrupt handling (and NAPI) on all tiles.
+ *
+ * If registration fails due to the link being down, then "retry_work"
+ * is used to keep calling "tile_net_open_inner()" until it succeeds.
+ *
+ * If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to
+ * stop egress, drain the LIPP buffers, unregister all the tiles, stop
+ * LIPP/LEPP, and wipe the LEPP queue.
+ *
+ * We start out with the ingress interrupt enabled on each CPU.  When
+ * this interrupt fires, we disable it, and call "napi_schedule()".
+ * This will cause "tile_net_poll()" to be called, which will pull
+ * packets from the netio queue, filtering them out, or passing them
+ * to "netif_receive_skb()".  If our budget is exhausted, we will
+ * return, knowing we will be called again later.  Otherwise, we
+ * reenable the ingress interrupt, and call "napi_complete()".
+ *
+ *
+ * NOTE: The use of "native_driver" ensures that EPP exists, and that
+ * "epp_sendv" is legal, and that "LIPP" is being used.
+ *
+ * NOTE: Failing to free completions for an arbitrarily long time
+ * (which is defined to be illegal) does in fact cause bizarre
+ * problems.  The "egress_timer" helps prevent this from happening.
+ *
+ * NOTE: The egress code can be interrupted by the interrupt handler.
+ */
+
+
+/* HACK: Allow use of "jumbo" packets. */
+/* This should be 1500 if "jumbo" is not set in LIPP. */
+/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */
+/* ISSUE: This has not been thoroughly tested (except at 1500). */
+#define TILE_NET_MTU 1500
+
+/* HACK: Define to support GSO. */
+/* ISSUE: This may actually hurt performance of the TCP blaster. */
+/* #define TILE_NET_GSO */
+
+/* Define this to collapse "duplicate" acks. */
+/* #define IGNORE_DUP_ACKS */
+
+/* HACK: Define this to verify incoming packets. */
+/* #define TILE_NET_VERIFY_INGRESS */
+
+/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */
+#define TILE_NET_TX_QUEUE_LEN 0
+
+/* Define to dump packets (prints out the whole packet on tx and rx). */
+/* #define TILE_NET_DUMP_PACKETS */
+
+/* Define to enable debug spew (all PDEBUG's are enabled). */
+/* #define TILE_NET_DEBUG */
+
+
+/* Define to activate paranoia checks. */
+/* #define TILE_NET_PARANOIA */
+
+/* Default transmit lockup timeout period, in jiffies. */
+#define TILE_NET_TIMEOUT (5 * HZ)
+
+/* Default retry interval for bringing up the NetIO interface, in jiffies. */
+#define TILE_NET_RETRY_INTERVAL (5 * HZ)
+
+/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */
+#define TILE_NET_DEVS 4
+
+
+
+/* Paranoia. */
+#if NET_IP_ALIGN != LIPP_PACKET_PADDING
+#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING."
+#endif
+
+
+/* Debug print. */
+#ifdef TILE_NET_DEBUG
+#define PDEBUG(fmt, args...) net_printk(fmt, ## args)
+#else
+#define PDEBUG(fmt, args...)
+#endif
+
+
+MODULE_AUTHOR("Tilera");
+MODULE_LICENSE("GPL");
+
+
+#define IS_MULTICAST(mac_addr) \
+	(((u8 *)(mac_addr))[0] & 0x01)
+
+#define IS_BROADCAST(mac_addr) \
+	(((u16 *)(mac_addr))[0] == 0xffff)
+
+
+/*
+ * Queue of incoming packets for a specific cpu and device.
+ *
+ * Includes a pointer to the "system" data, and the actual "user" data.
+ */
+struct tile_netio_queue {
+	netio_queue_impl_t *__system_part;
+	netio_queue_user_impl_t __user_part;
+
+};
+
+
+/*
+ * Statistics counters for a specific cpu and device.
+ */
+struct tile_net_stats_t {
+	u32 rx_packets;
+	u32 rx_bytes;
+	u32 tx_packets;
+	u32 tx_bytes;
+};
+
+
+/*
+ * Info for a specific cpu and device.
+ *
+ * ISSUE: There is a "dev" pointer in "napi" as well.
+ */
+struct tile_net_cpu {
+	/* The NAPI struct. */
+	struct napi_struct napi;
+	/* Packet queue. */
+	struct tile_netio_queue queue;
+	/* Statistics. */
+	struct tile_net_stats_t stats;
+	/* ISSUE: Is this needed? */
+	bool napi_enabled;
+	/* True if this tile has succcessfully registered with the IPP. */
+	bool registered;
+	/* True if the link was down last time we tried to register. */
+	bool link_down;
+	/* True if "egress_timer" is scheduled. */
+	bool egress_timer_scheduled;
+	/* Number of small sk_buffs which must still be provided. */
+	unsigned int num_needed_small_buffers;
+	/* Number of large sk_buffs which must still be provided. */
+	unsigned int num_needed_large_buffers;
+	/* A timer for handling egress completions. */
+	struct timer_list egress_timer;
+};
+
+
+/*
+ * Info for a specific device.
+ */
+struct tile_net_priv {
+	/* Our network device. */
+	struct net_device *dev;
+	/* The actual egress queue. */
+	lepp_queue_t *epp_queue;
+	/* Protects "epp_queue->cmd_tail" and "epp_queue->comp_tail" */
+	spinlock_t cmd_lock;
+	/* Protects "epp_queue->comp_head". */
+	spinlock_t comp_lock;
+	/* The hypervisor handle for this interface. */
+	int hv_devhdl;
+	/* The intr bit mask that IDs this device. */
+	u32 intr_id;
+	/* True iff "tile_net_open_aux()" has succeeded. */
+	int partly_opened;
+	/* True iff "tile_net_open_inner()" has succeeded. */
+	int fully_opened;
+	/* Effective network cpus. */
+	struct cpumask network_cpus_map;
+	/* Number of network cpus. */
+	int network_cpus_count;
+	/* Credits per network cpu. */
+	int network_cpus_credits;
+	/* Network stats. */
+	struct net_device_stats stats;
+	/* For NetIO bringup retries. */
+	struct delayed_work retry_work;
+	/* Quick access to per cpu data. */
+	struct tile_net_cpu *cpu[NR_CPUS];
+};
+
+
+/*
+ * The actual devices (xgbe0, xgbe1, gbe0, gbe1).
+ */
+static struct net_device *tile_net_devs[TILE_NET_DEVS];
+
+/*
+ * The "tile_net_cpu" structures for each device.
+ */
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1);
+
+
+/*
+ * True if "network_cpus" was specified.
+ */
+static bool network_cpus_used;
+
+/*
+ * The actual cpus in "network_cpus".
+ */
+static struct cpumask network_cpus_map;
+
+
+
+#ifdef TILE_NET_DEBUG
+/*
+ * printk with extra stuff.
+ *
+ * We print the CPU we're running in brackets.
+ */
+static void net_printk(char *fmt, ...)
+{
+	int i;
+	int len;
+	va_list args;
+	static char buf[256];
+
+	len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id());
+	va_start(args, fmt);
+	i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args);
+	va_end(args);
+	buf[255] = '\0';
+	pr_notice(buf);
+}
+#endif
+
+
+#ifdef TILE_NET_DUMP_PACKETS
+/*
+ * Dump a packet.
+ */
+static void dump_packet(unsigned char *data, unsigned long length, char *s)
+{
+	unsigned long i;
+	static unsigned int count;
+
+	pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n",
+	       data, length, s, count++);
+
+	pr_info("\n");
+
+	for (i = 0; i < length; i++) {
+		if ((i & 0xf) == 0)
+			sprintf(buf, "%8.8lx:", i);
+		sprintf(buf + strlen(buf), " %2.2x", data[i]);
+		if ((i & 0xf) == 0xf || i == length - 1)
+			pr_info("%s\n", buf);
+	}
+}
+#endif
+
+
+/*
+ * Provide support for the __netio_fastio1() swint
+ * (see <hv/drv_xgbe_intf.h> for how it is used).
+ *
+ * The fastio swint2 call may clobber all the caller-saved registers.
+ * It rarely clobbers memory, but we allow for the possibility in
+ * the signature just to be on the safe side.
+ *
+ * Also, gcc doesn't seem to allow an input operand to be
+ * clobbered, so we fake it with dummy outputs.
+ *
+ * This function can't be static because of the way it is declared
+ * in the netio header.
+ */
+inline int __netio_fastio1(u32 fastio_index, u32 arg0)
+{
+	long result, clobber_r1, clobber_r10;
+	asm volatile("swint2"
+		     : "=R00" (result),
+		       "=R01" (clobber_r1), "=R10" (clobber_r10)
+		     : "R10" (fastio_index), "R01" (arg0)
+		     : "memory", "r2", "r3", "r4",
+		       "r5", "r6", "r7", "r8", "r9",
+		       "r11", "r12", "r13", "r14",
+		       "r15", "r16", "r17", "r18", "r19",
+		       "r20", "r21", "r22", "r23", "r24",
+		       "r25", "r26", "r27", "r28", "r29");
+	return result;
+}
+
+
+/*
+ * Provide a linux buffer to LIPP.
+ */
+static void tile_net_provide_linux_buffer(struct tile_net_cpu *info,
+					  void *va, bool small)
+{
+	struct tile_netio_queue *queue = &info->queue;
+
+	/* Convert "va" and "small" to "linux_buffer_t". */
+	unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small;
+
+	__netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer);
+}
+
+
+/*
+ * Provide a linux buffer for LIPP.
+ */
+static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
+					   bool small)
+{
+	/* ISSUE: What should we use here? */
+	unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
+
+	/* Round up to ensure to avoid "false sharing" with last cache line. */
+	unsigned int buffer_size =
+		 (((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
+		   CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
+
+	/*
+	 * ISSUE: Since CPAs are 38 bits, and we can only encode the
+	 * high 31 bits in a "linux_buffer_t", the low 7 bits must be
+	 * zero, and thus, we must align the actual "va" mod 128.
+	 */
+	const unsigned long align = 128;
+
+	struct sk_buff *skb;
+	void *va;
+
+	struct sk_buff **skb_ptr;
+
+	/* Note that "dev_alloc_skb()" adds NET_SKB_PAD more bytes, */
+	/* and also "reserves" that many bytes. */
+	/* ISSUE: Can we "share" the NET_SKB_PAD bytes with "skb_ptr"? */
+	int len = sizeof(*skb_ptr) + align + buffer_size;
+
+	while (1) {
+
+		/* Allocate (or fail). */
+		skb = dev_alloc_skb(len);
+		if (skb == NULL)
+			return false;
+
+		/* Make room for a back-pointer to 'skb'. */
+		skb_reserve(skb, sizeof(*skb_ptr));
+
+		/* Make sure we are aligned. */
+		skb_reserve(skb, -(long)skb->data & (align - 1));
+
+		/* This address is given to IPP. */
+		va = skb->data;
+
+		if (small)
+			break;
+
+		/* ISSUE: This has never been observed! */
+		/* Large buffers must not span a huge page. */
+		if (((((long)va & ~HPAGE_MASK) + 1535) & HPAGE_MASK) == 0)
+			break;
+		pr_err("Leaking unaligned linux buffer at %p.\n", va);
+	}
+
+	/* Skip two bytes to satisfy LIPP assumptions. */
+	/* Note that this aligns IP on a 16 byte boundary. */
+	/* ISSUE: Do this when the packet arrives? */
+	skb_reserve(skb, NET_IP_ALIGN);
+
+	/* Save a back-pointer to 'skb'. */
+	skb_ptr = va - sizeof(*skb_ptr);
+	*skb_ptr = skb;
+
+	/* Invalidate the packet buffer. */
+	if (!hash_default)
+		__inv_buffer(skb->data, buffer_size);
+
+	/* Make sure "skb_ptr" has been flushed. */
+	__insn_mf();
+
+#ifdef TILE_NET_PARANOIA
+#if CHIP_HAS_CBOX_HOME_MAP()
+	if (hash_default) {
+		HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va);
+		if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
+			panic("Non-coherent ingress buffer!");
+	}
+#endif
+#endif
+
+	/* Provide the new buffer. */
+	tile_net_provide_linux_buffer(info, va, small);
+
+	return true;
+}
+
+
+/*
+ * Provide linux buffers for LIPP.
+ */
+static void tile_net_provide_needed_buffers(struct tile_net_cpu *info)
+{
+	while (info->num_needed_small_buffers != 0) {
+		if (!tile_net_provide_needed_buffer(info, true))
+			goto oops;
+		info->num_needed_small_buffers--;
+	}
+
+	while (info->num_needed_large_buffers != 0) {
+		if (!tile_net_provide_needed_buffer(info, false))
+			goto oops;
+		info->num_needed_large_buffers--;
+	}
+
+	return;
+
+oops:
+
+	/* Add a description to the page allocation failure dump. */
+	pr_notice("Could not provide a linux buffer to LIPP.\n");
+}
+
+
+/*
+ * Grab some LEPP completions, and store them in "comps", of size
+ * "comps_size", and return the number of completions which were
+ * stored, so the caller can free them.
+ *
+ * If "pending" is not NULL, it will be set to true if there might
+ * still be some pending completions caused by this tile, else false.
+ */
+static unsigned int tile_net_lepp_grab_comps(struct net_device *dev,
+					     struct sk_buff *comps[],
+					     unsigned int comps_size,
+					     bool *pending)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	lepp_queue_t *eq = priv->epp_queue;
+
+	unsigned int n = 0;
+
+	unsigned int comp_head;
+	unsigned int comp_busy;
+	unsigned int comp_tail;
+
+	spin_lock(&priv->comp_lock);
+
+	comp_head = eq->comp_head;
+	comp_busy = eq->comp_busy;
+	comp_tail = eq->comp_tail;
+
+	while (comp_head != comp_busy && n < comps_size) {
+		comps[n++] = eq->comps[comp_head];
+		LEPP_QINC(comp_head);
+	}
+
+	if (pending != NULL)
+		*pending = (comp_head != comp_tail);
+
+	eq->comp_head = comp_head;
+
+	spin_unlock(&priv->comp_lock);
+
+	return n;
+}
+
+
+/*
+ * Make sure the egress timer is scheduled.
+ *
+ * Note that we use "schedule if not scheduled" logic instead of the more
+ * obvious "reschedule" logic, because "reschedule" is fairly expensive.
+ */
+static void tile_net_schedule_egress_timer(struct tile_net_cpu *info)
+{
+	if (!info->egress_timer_scheduled) {
+		mod_timer_pinned(&info->egress_timer, jiffies + 1);
+		info->egress_timer_scheduled = true;
+	}
+}
+
+
+/*
+ * The "function" for "info->egress_timer".
+ *
+ * This timer will reschedule itself as long as there are any pending
+ * completions expected (on behalf of any tile).
+ *
+ * ISSUE: Realistically, will the timer ever stop scheduling itself?
+ *
+ * ISSUE: This timer is almost never actually needed, so just use a global
+ * timer that can run on any tile.
+ *
+ * ISSUE: Maybe instead track number of expected completions, and free
+ * only that many, resetting to zero if "pending" is ever false.
+ */
+static void tile_net_handle_egress_timer(unsigned long arg)
+{
+	struct tile_net_cpu *info = (struct tile_net_cpu *)arg;
+	struct net_device *dev = info->napi.dev;
+
+	struct sk_buff *olds[32];
+	unsigned int wanted = 32;
+	unsigned int i, nolds = 0;
+	bool pending;
+
+	/* The timer is no longer scheduled. */
+	info->egress_timer_scheduled = false;
+
+	nolds = tile_net_lepp_grab_comps(dev, olds, wanted, &pending);
+
+	for (i = 0; i < nolds; i++)
+		kfree_skb(olds[i]);
+
+	/* Reschedule timer if needed. */
+	if (pending)
+		tile_net_schedule_egress_timer(info);
+}
+
+
+#ifdef IGNORE_DUP_ACKS
+
+/*
+ * Help detect "duplicate" ACKs.  These are sequential packets (for a
+ * given flow) which are exactly 66 bytes long, sharing everything but
+ * ID=2@0x12, Hsum=2@0x18, Ack=4@0x2a, WinSize=2@0x30, Csum=2@0x32,
+ * Tstamps=10@0x38.  The ID's are +1, the Hsum's are -1, the Ack's are
+ * +N, and the Tstamps are usually identical.
+ *
+ * NOTE: Apparently truly duplicate acks (with identical "ack" values),
+ * should not be collapsed, as they are used for some kind of flow control.
+ */
+static bool is_dup_ack(char *s1, char *s2, unsigned int len)
+{
+	int i;
+
+	unsigned long long ignorable = 0;
+
+	/* Identification. */
+	ignorable |= (1ULL << 0x12);
+	ignorable |= (1ULL << 0x13);
+
+	/* Header checksum. */
+	ignorable |= (1ULL << 0x18);
+	ignorable |= (1ULL << 0x19);
+
+	/* ACK. */
+	ignorable |= (1ULL << 0x2a);
+	ignorable |= (1ULL << 0x2b);
+	ignorable |= (1ULL << 0x2c);
+	ignorable |= (1ULL << 0x2d);
+
+	/* WinSize. */
+	ignorable |= (1ULL << 0x30);
+	ignorable |= (1ULL << 0x31);
+
+	/* Checksum. */
+	ignorable |= (1ULL << 0x32);
+	ignorable |= (1ULL << 0x33);
+
+	for (i = 0; i < len; i++, ignorable >>= 1) {
+
+		if ((ignorable & 1) || (s1[i] == s2[i]))
+			continue;
+
+#ifdef TILE_NET_DEBUG
+		/* HACK: Mention non-timestamp diffs. */
+		if (i < 0x38 && i != 0x2f &&
+		    net_ratelimit())
+			pr_info("Diff at 0x%x\n", i);
+#endif
+
+		return false;
+	}
+
+#ifdef TILE_NET_NO_SUPPRESS_DUP_ACKS
+	/* HACK: Do not suppress truly duplicate ACKs. */
+	/* ISSUE: Is this actually necessary or helpful? */
+	if (s1[0x2a] == s2[0x2a] &&
+	    s1[0x2b] == s2[0x2b] &&
+	    s1[0x2c] == s2[0x2c] &&
+	    s1[0x2d] == s2[0x2d]) {
+		return false;
+	}
+#endif
+
+	return true;
+}
+
+#endif
+
+
+
+/*
+ * Like "tile_net_handle_packets()", but just discard packets.
+ */
+static void tile_net_discard_packets(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+	struct tile_netio_queue *queue = &info->queue;
+	netio_queue_impl_t *qsp = queue->__system_part;
+	netio_queue_user_impl_t *qup = &queue->__user_part;
+
+	while (qup->__packet_receive_read !=
+	       qsp->__packet_receive_queue.__packet_write) {
+
+		int index = qup->__packet_receive_read;
+
+		int index2_aux = index + sizeof(netio_pkt_t);
+		int index2 =
+			((index2_aux ==
+			  qsp->__packet_receive_queue.__last_packet_plus_one) ?
+			 0 : index2_aux);
+
+		netio_pkt_t *pkt = (netio_pkt_t *)
+			((unsigned long) &qsp[1] + index);
+
+		/* Extract the "linux_buffer_t". */
+		unsigned int buffer = pkt->__packet.word;
+
+		/* Convert "linux_buffer_t" to "va". */
+		void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+		/* Acquire the associated "skb". */
+		struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+		struct sk_buff *skb = *skb_ptr;
+
+		kfree_skb(skb);
+
+		/* Consume this packet. */
+		qup->__packet_receive_read = index2;
+	}
+}
+
+
+/*
+ * Handle the next packet.  Return true if "processed", false if "filtered".
+ */
+static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
+{
+	struct net_device *dev = info->napi.dev;
+
+	struct tile_netio_queue *queue = &info->queue;
+	netio_queue_impl_t *qsp = queue->__system_part;
+	netio_queue_user_impl_t *qup = &queue->__user_part;
+	struct tile_net_stats_t *stats = &info->stats;
+
+	int filter;
+
+	int index2_aux = index + sizeof(netio_pkt_t);
+	int index2 =
+		((index2_aux ==
+		  qsp->__packet_receive_queue.__last_packet_plus_one) ?
+		 0 : index2_aux);
+
+	netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
+
+	netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt);
+
+	/* Extract the packet size. */
+	unsigned long len =
+		(NETIO_PKT_CUSTOM_LENGTH(pkt) +
+		 NET_IP_ALIGN - NETIO_PACKET_PADDING);
+
+	/* Extract the "linux_buffer_t". */
+	unsigned int buffer = pkt->__packet.word;
+
+	/* Extract "small" (vs "large"). */
+	bool small = ((buffer & 1) != 0);
+
+	/* Convert "linux_buffer_t" to "va". */
+	void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+	/* Extract the packet data pointer. */
+	/* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
+	unsigned char *buf = va + NET_IP_ALIGN;
+
+#ifdef IGNORE_DUP_ACKS
+
+	static int other;
+	static int final;
+	static int keep;
+	static int skip;
+
+#endif
+
+	/* Invalidate the packet buffer. */
+	if (!hash_default)
+		__inv_buffer(buf, len);
+
+	/* ISSUE: Is this needed? */
+	dev->last_rx = jiffies;
+
+#ifdef TILE_NET_DUMP_PACKETS
+	dump_packet(buf, len, "rx");
+#endif /* TILE_NET_DUMP_PACKETS */
+
+#ifdef TILE_NET_VERIFY_INGRESS
+	if (!NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt) &&
+	    NETIO_PKT_L4_CSUM_CALCULATED_M(metadata, pkt)) {
+		/*
+		 * FIXME: This complains about UDP packets
+		 * with a "zero" checksum (bug 6624).
+		 */
+#ifdef TILE_NET_PANIC_ON_BAD
+		dump_packet(buf, len, "rx");
+		panic("Bad L4 checksum.");
+#else
+		pr_warning("Bad L4 checksum on %d byte packet.\n", len);
+#endif
+	}
+	if (!NETIO_PKT_L3_CSUM_CORRECT_M(metadata, pkt) &&
+	    NETIO_PKT_L3_CSUM_CALCULATED_M(metadata, pkt)) {
+		dump_packet(buf, len, "rx");
+		panic("Bad L3 checksum.");
+	}
+	switch (NETIO_PKT_STATUS_M(metadata, pkt)) {
+	case NETIO_PKT_STATUS_OVERSIZE:
+		if (len >= 64) {
+			dump_packet(buf, len, "rx");
+			panic("Unexpected OVERSIZE.");
+		}
+		break;
+	case NETIO_PKT_STATUS_BAD:
+#ifdef TILE_NET_PANIC_ON_BAD
+		dump_packet(buf, len, "rx");
+		panic("Unexpected BAD packet.");
+#else
+		pr_warning("Unexpected BAD %d byte packet.\n", len);
+#endif
+	}
+#endif
+
+	filter = 0;
+
+	if (!(dev->flags & IFF_UP)) {
+		/* Filter packets received before we're up. */
+		filter = 1;
+	} else if (!(dev->flags & IFF_PROMISC)) {
+		/*
+		 * FIXME: Implement HW multicast filter.
+		 */
+		if (!IS_MULTICAST(buf) && !IS_BROADCAST(buf)) {
+			/* Filter packets not for our address. */
+			const u8 *mine = dev->dev_addr;
+			filter = compare_ether_addr(mine, buf);
+		}
+	}
+
+#ifdef IGNORE_DUP_ACKS
+
+	if (len != 66) {
+		/* FIXME: Must check "is_tcp_ack(buf, len)" somehow. */
+
+		other++;
+
+	} else if (index2 ==
+		   qsp->__packet_receive_queue.__packet_write) {
+
+		final++;
+
+	} else {
+
+		netio_pkt_t *pkt2 = (netio_pkt_t *)
+			((unsigned long) &qsp[1] + index2);
+
+		netio_pkt_metadata_t *metadata2 =
+			NETIO_PKT_METADATA(pkt2);
+
+		/* Extract the packet size. */
+		unsigned long len2 =
+			(NETIO_PKT_CUSTOM_LENGTH(pkt2) +
+			 NET_IP_ALIGN - NETIO_PACKET_PADDING);
+
+		if (len2 == 66 &&
+		    NETIO_PKT_FLOW_HASH_M(metadata, pkt) ==
+		    NETIO_PKT_FLOW_HASH_M(metadata2, pkt2)) {
+
+			/* Extract the "linux_buffer_t". */
+			unsigned int buffer2 = pkt2->__packet.word;
+
+			/* Convert "linux_buffer_t" to "va". */
+			void *va2 =
+				__va((phys_addr_t)(buffer2 >> 1) << 7);
+
+			/* Extract the packet data pointer. */
+			/* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
+			unsigned char *buf2 = va2 + NET_IP_ALIGN;
+
+			/* Invalidate the packet buffer. */
+			if (!hash_default)
+				__inv_buffer(buf2, len2);
+
+			if (is_dup_ack(buf, buf2, len)) {
+				skip++;
+				filter = 1;
+			} else {
+				keep++;
+			}
+		}
+	}
+
+	if (net_ratelimit())
+		pr_info("Other %d Final %d Keep %d Skip %d.\n",
+			other, final, keep, skip);
+
+#endif
+
+	if (filter) {
+
+		/* ISSUE: Update "drop" statistics? */
+
+		tile_net_provide_linux_buffer(info, va, small);
+
+	} else {
+
+		/* Acquire the associated "skb". */
+		struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+		struct sk_buff *skb = *skb_ptr;
+
+		/* Paranoia. */
+		if (skb->data != buf)
+			panic("Corrupt linux buffer from LIPP! "
+			      "VA=%p, skb=%p, skb->data=%p\n",
+			      va, skb, skb->data);
+
+		/* Encode the actual packet length. */
+		skb_put(skb, len);
+
+		/* NOTE: This call also sets "skb->dev = dev". */
+		skb->protocol = eth_type_trans(skb, dev);
+
+		/* ISSUE: Discard corrupt packets? */
+		/* ISSUE: Discard packets with bad checksums? */
+
+		/* Avoid recomputing TCP/UDP checksums. */
+		if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt))
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+		netif_receive_skb(skb);
+
+		stats->rx_packets++;
+		stats->rx_bytes += len;
+
+		if (small)
+			info->num_needed_small_buffers++;
+		else
+			info->num_needed_large_buffers++;
+	}
+
+	/* Return four credits after every fourth packet. */
+	if (--qup->__receive_credit_remaining == 0) {
+		u32 interval = qup->__receive_credit_interval;
+		qup->__receive_credit_remaining = interval;
+		__netio_fastio_return_credits(qup->__fastio_index, interval);
+	}
+
+	/* Consume this packet. */
+	qup->__packet_receive_read = index2;
+
+	return !filter;
+}
+
+
+/*
+ * Handle some packets for the given device on the current CPU.
+ *
+ * ISSUE: The "rotting packet" race condition occurs if a packet
+ * arrives after the queue appears to be empty, and before the
+ * hypervisor interrupt is re-enabled.
+ */
+static int tile_net_poll(struct napi_struct *napi, int budget)
+{
+	struct net_device *dev = napi->dev;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+	struct tile_netio_queue *queue = &info->queue;
+	netio_queue_impl_t *qsp = queue->__system_part;
+	netio_queue_user_impl_t *qup = &queue->__user_part;
+
+	unsigned int work = 0;
+
+	while (1) {
+		int index = qup->__packet_receive_read;
+		if (index == qsp->__packet_receive_queue.__packet_write)
+			break;
+
+		if (tile_net_poll_aux(info, index)) {
+			if (++work >= budget)
+				goto done;
+		}
+	}
+
+	napi_complete(&info->napi);
+
+	/* Re-enable hypervisor interrupts. */
+	enable_percpu_irq(priv->intr_id);
+
+	/* HACK: Avoid the "rotting packet" problem. */
+	if (qup->__packet_receive_read !=
+	    qsp->__packet_receive_queue.__packet_write)
+		napi_schedule(&info->napi);
+
+	/* ISSUE: Handle completions? */
+
+done:
+
+	tile_net_provide_needed_buffers(info);
+
+	return work;
+}
+
+
+/*
+ * Handle an ingress interrupt for the given device on the current cpu.
+ */
+static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr)
+{
+	struct net_device *dev = (struct net_device *)dev_ptr;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+	/* Disable hypervisor interrupt. */
+	disable_percpu_irq(priv->intr_id);
+
+	napi_schedule(&info->napi);
+
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * One time initialization per interface.
+ */
+static int tile_net_open_aux(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	int ret;
+	int dummy;
+	unsigned int epp_lotar;
+
+	/*
+	 * Find out where EPP memory should be homed.
+	 */
+	ret = hv_dev_pread(priv->hv_devhdl, 0,
+			   (HV_VirtAddr)&epp_lotar, sizeof(epp_lotar),
+			   NETIO_EPP_SHM_OFF);
+	if (ret < 0) {
+		pr_err("could not read epp_shm_queue lotar.\n");
+		return -EIO;
+	}
+
+	/*
+	 * Home the page on the EPP.
+	 */
+	{
+		int epp_home = hv_lotar_to_cpu(epp_lotar);
+		struct page *page = virt_to_page(priv->epp_queue);
+		homecache_change_page_home(page, 0, epp_home);
+	}
+
+	/*
+	 * Register the EPP shared memory queue.
+	 */
+	{
+		netio_ipp_address_t ea = {
+			.va = 0,
+			.pa = __pa(priv->epp_queue),
+			.pte = hv_pte(0),
+			.size = PAGE_SIZE,
+		};
+		ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar);
+		ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3);
+		ret = hv_dev_pwrite(priv->hv_devhdl, 0,
+				    (HV_VirtAddr)&ea,
+				    sizeof(ea),
+				    NETIO_EPP_SHM_OFF);
+		if (ret < 0)
+			return -EIO;
+	}
+
+	/*
+	 * Start LIPP/LEPP.
+	 */
+	if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+			  sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) {
+		pr_warning("Failed to start LIPP/LEPP.\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+
+/*
+ * Register with hypervisor on each CPU.
+ *
+ * Strangely, this function does important things even if it "fails",
+ * which is especially common if the link is not up yet.  Hopefully
+ * these things are all "harmless" if done twice!
+ */
+static void tile_net_register(void *dev_ptr)
+{
+	struct net_device *dev = (struct net_device *)dev_ptr;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info;
+
+	struct tile_netio_queue *queue;
+
+	/* Only network cpus can receive packets. */
+	int queue_id =
+		cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255;
+
+	netio_input_config_t config = {
+		.flags = 0,
+		.num_receive_packets = priv->network_cpus_credits,
+		.queue_id = queue_id
+	};
+
+	int ret = 0;
+	netio_queue_impl_t *queuep;
+
+	PDEBUG("tile_net_register(queue_id %d)\n", queue_id);
+
+	if (!strcmp(dev->name, "xgbe0"))
+		info = &__get_cpu_var(hv_xgbe0);
+	else if (!strcmp(dev->name, "xgbe1"))
+		info = &__get_cpu_var(hv_xgbe1);
+	else if (!strcmp(dev->name, "gbe0"))
+		info = &__get_cpu_var(hv_gbe0);
+	else if (!strcmp(dev->name, "gbe1"))
+		info = &__get_cpu_var(hv_gbe1);
+	else
+		BUG();
+
+	/* Initialize the egress timer. */
+	init_timer(&info->egress_timer);
+	info->egress_timer.data = (long)info;
+	info->egress_timer.function = tile_net_handle_egress_timer;
+
+	priv->cpu[my_cpu] = info;
+
+	/*
+	 * Register ourselves with the IPP.
+	 */
+	ret = hv_dev_pwrite(priv->hv_devhdl, 0,
+			    (HV_VirtAddr)&config,
+			    sizeof(netio_input_config_t),
+			    NETIO_IPP_INPUT_REGISTER_OFF);
+	PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
+	       ret);
+	if (ret < 0) {
+		printk(KERN_DEBUG "hv_dev_pwrite NETIO_IPP_INPUT_REGISTER_OFF"
+		       " failure %d\n", ret);
+		info->link_down = (ret == NETIO_LINK_DOWN);
+		return;
+	}
+
+	/*
+	 * Get the pointer to our queue's system part.
+	 */
+
+	ret = hv_dev_pread(priv->hv_devhdl, 0,
+			   (HV_VirtAddr)&queuep,
+			   sizeof(netio_queue_impl_t *),
+			   NETIO_IPP_INPUT_REGISTER_OFF);
+	PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
+	       ret);
+	PDEBUG("queuep %p\n", queuep);
+	if (ret <= 0) {
+		/* ISSUE: Shouldn't this be a fatal error? */
+		pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n");
+		return;
+	}
+
+	queue = &info->queue;
+
+	queue->__system_part = queuep;
+
+	memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t));
+
+	/* This is traditionally "config.num_receive_packets / 2". */
+	queue->__user_part.__receive_credit_interval = 4;
+	queue->__user_part.__receive_credit_remaining =
+		queue->__user_part.__receive_credit_interval;
+
+	/*
+	 * Get a fastio index from the hypervisor.
+	 * ISSUE: Shouldn't this check the result?
+	 */
+	ret = hv_dev_pread(priv->hv_devhdl, 0,
+			   (HV_VirtAddr)&queue->__user_part.__fastio_index,
+			   sizeof(queue->__user_part.__fastio_index),
+			   NETIO_IPP_GET_FASTIO_OFF);
+	PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret);
+
+	netif_napi_add(dev, &info->napi, tile_net_poll, 64);
+
+	/* Now we are registered. */
+	info->registered = true;
+}
+
+
+/*
+ * Unregister with hypervisor on each CPU.
+ */
+static void tile_net_unregister(void *dev_ptr)
+{
+	struct net_device *dev = (struct net_device *)dev_ptr;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+	int ret = 0;
+	int dummy = 0;
+
+	/* Do nothing if never registered. */
+	if (info == NULL)
+		return;
+
+	/* Do nothing if already unregistered. */
+	if (!info->registered)
+		return;
+
+	/*
+	 * Unregister ourselves with LIPP.
+	 */
+	ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+			    sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
+	PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_UNREGISTER_OFF) returned %d\n",
+	       ret);
+	if (ret < 0) {
+		/* FIXME: Just panic? */
+		pr_err("hv_dev_pwrite NETIO_IPP_INPUT_UNREGISTER_OFF"
+		       " failure %d\n", ret);
+	}
+
+	/*
+	 * Discard all packets still in our NetIO queue.  Hopefully,
+	 * once the unregister call is complete, there will be no
+	 * packets still in flight on the IDN.
+	 */
+	tile_net_discard_packets(dev);
+
+	/* Reset state. */
+	info->num_needed_small_buffers = 0;
+	info->num_needed_large_buffers = 0;
+
+	/* Cancel egress timer. */
+	del_timer(&info->egress_timer);
+	info->egress_timer_scheduled = false;
+
+	netif_napi_del(&info->napi);
+
+	/* Now we are unregistered. */
+	info->registered = false;
+}
+
+
+/*
+ * Helper function for "tile_net_stop()".
+ *
+ * Also used to handle registration failure in "tile_net_open_inner()",
+ * when "fully_opened" is known to be false, and the various extra
+ * steps in "tile_net_stop()" are not necessary.  ISSUE: It might be
+ * simpler if we could just call "tile_net_stop()" anyway.
+ */
+static void tile_net_stop_aux(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	int dummy = 0;
+
+	/* Unregister all tiles, so LIPP will stop delivering packets. */
+	on_each_cpu(tile_net_unregister, (void *)dev, 1);
+
+	/* Stop LIPP/LEPP. */
+	if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+			  sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0)
+		panic("Failed to stop LIPP/LEPP!\n");
+
+	priv->partly_opened = 0;
+}
+
+
+/*
+ * Disable ingress interrupts for the given device on the current cpu.
+ */
+static void tile_net_disable_intr(void *dev_ptr)
+{
+	struct net_device *dev = (struct net_device *)dev_ptr;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+	/* Disable hypervisor interrupt. */
+	disable_percpu_irq(priv->intr_id);
+
+	/* Disable NAPI if needed. */
+	if (info != NULL && info->napi_enabled) {
+		napi_disable(&info->napi);
+		info->napi_enabled = false;
+	}
+}
+
+
+/*
+ * Enable ingress interrupts for the given device on the current cpu.
+ */
+static void tile_net_enable_intr(void *dev_ptr)
+{
+	struct net_device *dev = (struct net_device *)dev_ptr;
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+	/* Enable hypervisor interrupt. */
+	enable_percpu_irq(priv->intr_id);
+
+	/* Enable NAPI. */
+	napi_enable(&info->napi);
+	info->napi_enabled = true;
+}
+
+
+/*
+ * tile_net_open_inner does most of the work of bringing up the interface.
+ * It's called from tile_net_open(), and also from tile_net_retry_open().
+ * The return value is 0 if the interface was brought up, < 0 if
+ * tile_net_open() should return the return value as an error, and > 0 if
+ * tile_net_open() should return success and schedule a work item to
+ * periodically retry the bringup.
+ */
+static int tile_net_open_inner(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info;
+	struct tile_netio_queue *queue;
+	unsigned int irq;
+	int i;
+
+	/*
+	 * First try to register just on the local CPU, and handle any
+	 * semi-expected "link down" failure specially.  Note that we
+	 * do NOT call "tile_net_stop_aux()", unlike below.
+	 */
+	tile_net_register(dev);
+	info = priv->cpu[my_cpu];
+	if (!info->registered) {
+		if (info->link_down)
+			return 1;
+		return -EAGAIN;
+	}
+
+	/*
+	 * Now register everywhere else.  If any registration fails,
+	 * even for "link down" (which might not be possible), we
+	 * clean up using "tile_net_stop_aux()".
+	 */
+	smp_call_function(tile_net_register, (void *)dev, 1);
+	for_each_online_cpu(i) {
+		if (!priv->cpu[i]->registered) {
+			tile_net_stop_aux(dev);
+			return -EAGAIN;
+		}
+	}
+
+	queue = &info->queue;
+
+	/*
+	 * Set the device intr bit mask.
+	 * The tile_net_register above sets per tile __intr_id.
+	 */
+	priv->intr_id = queue->__system_part->__intr_id;
+	BUG_ON(!priv->intr_id);
+
+	/*
+	 * Register the device interrupt handler.
+	 * The __ffs() function returns the index into the interrupt handler
+	 * table from the interrupt bit mask which should have one bit
+	 * and one bit only set.
+	 */
+	irq = __ffs(priv->intr_id);
+	tile_irq_activate(irq, TILE_IRQ_PERCPU);
+	BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
+			   0, dev->name, (void *)dev) != 0);
+
+	/* ISSUE: How could "priv->fully_opened" ever be "true" here? */
+
+	if (!priv->fully_opened) {
+
+		int dummy = 0;
+
+		/* Allocate initial buffers. */
+
+		int max_buffers =
+			priv->network_cpus_count * priv->network_cpus_credits;
+
+		info->num_needed_small_buffers =
+			min(LIPP_SMALL_BUFFERS, max_buffers);
+
+		info->num_needed_large_buffers =
+			min(LIPP_LARGE_BUFFERS, max_buffers);
+
+		tile_net_provide_needed_buffers(info);
+
+		if (info->num_needed_small_buffers != 0 ||
+		    info->num_needed_large_buffers != 0)
+			panic("Insufficient memory for buffer stack!");
+
+		/* Start LIPP/LEPP and activate "ingress" at the shim. */
+		if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+				  sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0)
+			panic("Failed to activate the LIPP Shim!\n");
+
+		priv->fully_opened = 1;
+	}
+
+	/* On each tile, enable the hypervisor to trigger interrupts. */
+	/* ISSUE: Do this before starting LIPP/LEPP? */
+	on_each_cpu(tile_net_enable_intr, (void *)dev, 1);
+
+	/* Start our transmit queue. */
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+
+/*
+ * Called periodically to retry bringing up the NetIO interface,
+ * if it doesn't come up cleanly during tile_net_open().
+ */
+static void tile_net_open_retry(struct work_struct *w)
+{
+	struct delayed_work *dw =
+		container_of(w, struct delayed_work, work);
+
+	struct tile_net_priv *priv =
+		container_of(dw, struct tile_net_priv, retry_work);
+
+	/*
+	 * Try to bring the NetIO interface up.  If it fails, reschedule
+	 * ourselves to try again later; otherwise, tell Linux we now have
+	 * a working link.  ISSUE: What if the return value is negative?
+	 */
+	if (tile_net_open_inner(priv->dev))
+		schedule_delayed_work_on(singlethread_cpu, &priv->retry_work,
+					 TILE_NET_RETRY_INTERVAL);
+	else
+		netif_carrier_on(priv->dev);
+}
+
+
+/*
+ * Called when a network interface is made active.
+ *
+ * Returns 0 on success, negative value on failure.
+ *
+ * The open entry point is called when a network interface is made
+ * active by the system (IFF_UP).  At this point all resources needed
+ * for transmit and receive operations are allocated, the interrupt
+ * handler is registered with the OS, the watchdog timer is started,
+ * and the stack is notified that the interface is ready.
+ *
+ * If the actual link is not available yet, then we tell Linux that
+ * we have no carrier, and we keep checking until the link comes up.
+ */
+static int tile_net_open(struct net_device *dev)
+{
+	int ret = 0;
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	/*
+	 * We rely on priv->partly_opened to tell us if this is the
+	 * first time this interface is being brought up. If it is
+	 * set, the IPP was already initialized and should not be
+	 * initialized again.
+	 */
+	if (!priv->partly_opened) {
+
+		int count;
+		int credits;
+
+		/* Initialize LIPP/LEPP, and start the Shim. */
+		ret = tile_net_open_aux(dev);
+		if (ret < 0) {
+			pr_err("tile_net_open_aux failed: %d\n", ret);
+			return ret;
+		}
+
+		/* Analyze the network cpus. */
+
+		if (network_cpus_used)
+			cpumask_copy(&priv->network_cpus_map,
+				     &network_cpus_map);
+		else
+			cpumask_copy(&priv->network_cpus_map, cpu_online_mask);
+
+
+		count = cpumask_weight(&priv->network_cpus_map);
+
+		/* Limit credits to available buffers, and apply min. */
+		credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1);
+
+		/* Apply "GBE" max limit. */
+		/* ISSUE: Use higher limit for XGBE? */
+		credits = min(NETIO_MAX_RECEIVE_PKTS, credits);
+
+		priv->network_cpus_count = count;
+		priv->network_cpus_credits = credits;
+
+#ifdef TILE_NET_DEBUG
+		pr_info("Using %d network cpus, with %d credits each\n",
+		       priv->network_cpus_count, priv->network_cpus_credits);
+#endif
+
+		priv->partly_opened = 1;
+	}
+
+	/*
+	 * Attempt to bring up the link.
+	 */
+	ret = tile_net_open_inner(dev);
+	if (ret <= 0) {
+		if (ret == 0)
+			netif_carrier_on(dev);
+		return ret;
+	}
+
+	/*
+	 * We were unable to bring up the NetIO interface, but we want to
+	 * try again in a little bit.  Tell Linux that we have no carrier
+	 * so it doesn't try to use the interface before the link comes up
+	 * and then remember to try again later.
+	 */
+	netif_carrier_off(dev);
+	schedule_delayed_work_on(singlethread_cpu, &priv->retry_work,
+				 TILE_NET_RETRY_INTERVAL);
+
+	return 0;
+}
+
+
+/*
+ * Disables a network interface.
+ *
+ * Returns 0, this is not allowed to fail.
+ *
+ * The close entry point is called when an interface is de-activated
+ * by the OS.  The hardware is still under the drivers control, but
+ * needs to be disabled.  A global MAC reset is issued to stop the
+ * hardware, and all transmit and receive resources are freed.
+ *
+ * ISSUE: Can this can be called while "tile_net_poll()" is running?
+ */
+static int tile_net_stop(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	bool pending = true;
+
+	PDEBUG("tile_net_stop()\n");
+
+	/* ISSUE: Only needed if not yet fully open. */
+	cancel_delayed_work_sync(&priv->retry_work);
+
+	/* Can't transmit any more. */
+	netif_stop_queue(dev);
+
+	/*
+	 * Disable hypervisor interrupts on each tile.
+	 */
+	on_each_cpu(tile_net_disable_intr, (void *)dev, 1);
+
+	/*
+	 * Unregister the interrupt handler.
+	 * The __ffs() function returns the index into the interrupt handler
+	 * table from the interrupt bit mask which should have one bit
+	 * and one bit only set.
+	 */
+	if (priv->intr_id)
+		free_irq(__ffs(priv->intr_id), dev);
+
+	/*
+	 * Drain all the LIPP buffers.
+	 */
+
+	while (true) {
+		int buffer;
+
+		/* NOTE: This should never fail. */
+		if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
+				 sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0)
+			break;
+
+		/* Stop when done. */
+		if (buffer == 0)
+			break;
+
+		{
+			/* Convert "linux_buffer_t" to "va". */
+			void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+			/* Acquire the associated "skb". */
+			struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+			struct sk_buff *skb = *skb_ptr;
+
+			kfree_skb(skb);
+		}
+	}
+
+	/* Stop LIPP/LEPP. */
+	tile_net_stop_aux(dev);
+
+
+	priv->fully_opened = 0;
+
+
+	/*
+	 * XXX: ISSUE: It appears that, in practice anyway, by the
+	 * time we get here, there are no pending completions.
+	 */
+	while (pending) {
+
+		struct sk_buff *olds[32];
+		unsigned int wanted = 32;
+		unsigned int i, nolds = 0;
+
+		nolds = tile_net_lepp_grab_comps(dev, olds,
+						 wanted, &pending);
+
+		/* ISSUE: We have never actually seen this debug spew. */
+		if (nolds != 0)
+			pr_info("During tile_net_stop(), grabbed %d comps.\n",
+			       nolds);
+
+		for (i = 0; i < nolds; i++)
+			kfree_skb(olds[i]);
+	}
+
+
+	/* Wipe the EPP queue. */
+	memset(priv->epp_queue, 0, sizeof(lepp_queue_t));
+
+	/* Evict the EPP queue. */
+	finv_buffer(priv->epp_queue, PAGE_SIZE);
+
+	return 0;
+}
+
+
+/*
+ * Prepare the "frags" info for the resulting LEPP command.
+ *
+ * If needed, flush the memory used by the frags.
+ */
+static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
+				      struct sk_buff *skb,
+				      void *b_data, unsigned int b_len)
+{
+	unsigned int i, n = 0;
+
+	struct skb_shared_info *sh = skb_shinfo(skb);
+
+	phys_addr_t cpa;
+
+	if (b_len != 0) {
+
+		if (!hash_default)
+			finv_buffer_remote(b_data, b_len);
+
+		cpa = __pa(b_data);
+		frags[n].cpa_lo = cpa;
+		frags[n].cpa_hi = cpa >> 32;
+		frags[n].length = b_len;
+		frags[n].hash_for_home = hash_default;
+		n++;
+	}
+
+	for (i = 0; i < sh->nr_frags; i++) {
+
+		skb_frag_t *f = &sh->frags[i];
+		unsigned long pfn = page_to_pfn(f->page);
+
+		/* FIXME: Compute "hash_for_home" properly. */
+		/* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */
+		int hash_for_home = hash_default;
+
+		/* FIXME: Hmmm. */
+		if (!hash_default) {
+			void *va = pfn_to_kaddr(pfn) + f->page_offset;
+			BUG_ON(PageHighMem(f->page));
+			finv_buffer_remote(va, f->size);
+		}
+
+		cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
+		frags[n].cpa_lo = cpa;
+		frags[n].cpa_hi = cpa >> 32;
+		frags[n].length = f->size;
+		frags[n].hash_for_home = hash_for_home;
+		n++;
+	}
+
+	return n;
+}
+
+
+/*
+ * This function takes "skb", consisting of a header template and a
+ * payload, and hands it to LEPP, to emit as one or more segments,
+ * each consisting of a possibly modified header, plus a piece of the
+ * payload, via a process known as "tcp segmentation offload".
+ *
+ * Usually, "data" will contain the header template, of size "sh_len",
+ * and "sh->frags" will contain "skb->data_len" bytes of payload, and
+ * there will be "sh->gso_segs" segments.
+ *
+ * Sometimes, if "sendfile()" requires copying, we will be called with
+ * "data" containing the header and payload, with "frags" being empty.
+ *
+ * In theory, "sh->nr_frags" could be 3, but in practice, it seems
+ * that this will never actually happen.
+ *
+ * See "emulate_large_send_offload()" for some reference code, which
+ * does not handle checksumming.
+ *
+ * ISSUE: How do we make sure that high memory DMA does not migrate?
+ */
+static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+	struct tile_net_stats_t *stats = &info->stats;
+
+	struct skb_shared_info *sh = skb_shinfo(skb);
+
+	unsigned char *data = skb->data;
+
+	/* The ip header follows the ethernet header. */
+	struct iphdr *ih = ip_hdr(skb);
+	unsigned int ih_len = ih->ihl * 4;
+
+	/* Note that "nh == ih", by definition. */
+	unsigned char *nh = skb_network_header(skb);
+	unsigned int eh_len = nh - data;
+
+	/* The tcp header follows the ip header. */
+	struct tcphdr *th = (struct tcphdr *)(nh + ih_len);
+	unsigned int th_len = th->doff * 4;
+
+	/* The total number of header bytes. */
+	/* NOTE: This may be less than skb_headlen(skb). */
+	unsigned int sh_len = eh_len + ih_len + th_len;
+
+	/* The number of payload bytes at "skb->data + sh_len". */
+	/* This is non-zero for sendfile() without HIGHDMA. */
+	unsigned int b_len = skb_headlen(skb) - sh_len;
+
+	/* The total number of payload bytes. */
+	unsigned int d_len = b_len + skb->data_len;
+
+	/* The maximum payload size. */
+	unsigned int p_len = sh->gso_size;
+
+	/* The total number of segments. */
+	unsigned int num_segs = sh->gso_segs;
+
+	/* The temporary copy of the command. */
+	u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4];
+	lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body;
+
+	/* Analyze the "frags". */
+	unsigned int num_frags =
+		tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len);
+
+	/* The size of the command, including frags and header. */
+	size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len);
+
+	/* The command header. */
+	lepp_tso_cmd_t cmd_init = {
+		.tso = true,
+		.header_size = sh_len,
+		.ip_offset = eh_len,
+		.tcp_offset = eh_len + ih_len,
+		.payload_size = p_len,
+		.num_frags = num_frags,
+	};
+
+	unsigned long irqflags;
+
+	lepp_queue_t *eq = priv->epp_queue;
+
+	struct sk_buff *olds[4];
+	unsigned int wanted = 4;
+	unsigned int i, nolds = 0;
+
+	unsigned int cmd_head, cmd_tail, cmd_next;
+	unsigned int comp_tail;
+
+	unsigned int free_slots;
+
+
+	/* Paranoia. */
+	BUG_ON(skb->protocol != htons(ETH_P_IP));
+	BUG_ON(ih->protocol != IPPROTO_TCP);
+	BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL);
+	BUG_ON(num_frags > LEPP_MAX_FRAGS);
+	/*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */
+	BUG_ON(num_segs <= 1);
+
+
+	/* Finish preparing the command. */
+
+	/* Copy the command header. */
+	*cmd = cmd_init;
+
+	/* Copy the "header". */
+	memcpy(&cmd->frags[num_frags], data, sh_len);
+
+
+	/* Prefetch and wait, to minimize time spent holding the spinlock. */
+	prefetch_L1(&eq->comp_tail);
+	prefetch_L1(&eq->cmd_tail);
+	mb();
+
+
+	/* Enqueue the command. */
+
+	spin_lock_irqsave(&priv->cmd_lock, irqflags);
+
+	/*
+	 * Handle completions if needed to make room.
+	 * HACK: Spin until there is sufficient room.
+	 */
+	free_slots = lepp_num_free_comp_slots(eq);
+	if (free_slots < 1) {
+spin:
+		nolds += tile_net_lepp_grab_comps(dev, olds + nolds,
+						  wanted - nolds, NULL);
+		if (lepp_num_free_comp_slots(eq) < 1)
+			goto spin;
+	}
+
+	cmd_head = eq->cmd_head;
+	cmd_tail = eq->cmd_tail;
+
+	/* NOTE: The "gotos" below are untested. */
+
+	/* Prepare to advance, detecting full queue. */
+	cmd_next = cmd_tail + cmd_size;
+	if (cmd_tail < cmd_head && cmd_next >= cmd_head)
+		goto spin;
+	if (cmd_next > LEPP_CMD_LIMIT) {
+		cmd_next = 0;
+		if (cmd_next == cmd_head)
+			goto spin;
+	}
+
+	/* Copy the command. */
+	memcpy(&eq->cmds[cmd_tail], cmd, cmd_size);
+
+	/* Advance. */
+	cmd_tail = cmd_next;
+
+	/* Record "skb" for eventual freeing. */
+	comp_tail = eq->comp_tail;
+	eq->comps[comp_tail] = skb;
+	LEPP_QINC(comp_tail);
+	eq->comp_tail = comp_tail;
+
+	/* Flush before allowing LEPP to handle the command. */
+	__insn_mf();
+
+	eq->cmd_tail = cmd_tail;
+
+	spin_unlock_irqrestore(&priv->cmd_lock, irqflags);
+
+	if (nolds == 0)
+		nolds = tile_net_lepp_grab_comps(dev, olds, wanted, NULL);
+
+	/* Handle completions. */
+	for (i = 0; i < nolds; i++)
+		kfree_skb(olds[i]);
+
+	/* Update stats. */
+	stats->tx_packets += num_segs;
+	stats->tx_bytes += (num_segs * sh_len) + d_len;
+
+	/* Make sure the egress timer is scheduled. */
+	tile_net_schedule_egress_timer(info);
+
+	return NETDEV_TX_OK;
+}
+
+
+/*
+ * Transmit a packet (called by the kernel via "hard_start_xmit" hook).
+ */
+static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+	int my_cpu = smp_processor_id();
+	struct tile_net_cpu *info = priv->cpu[my_cpu];
+	struct tile_net_stats_t *stats = &info->stats;
+
+	unsigned long irqflags;
+
+	struct skb_shared_info *sh = skb_shinfo(skb);
+
+	unsigned int len = skb->len;
+	unsigned char *data = skb->data;
+
+	unsigned int csum_start = skb->csum_start - skb_headroom(skb);
+
+	lepp_frag_t frags[LEPP_MAX_FRAGS];
+
+	unsigned int num_frags;
+
+	lepp_queue_t *eq = priv->epp_queue;
+
+	struct sk_buff *olds[4];
+	unsigned int wanted = 4;
+	unsigned int i, nolds = 0;
+
+	unsigned int cmd_size = sizeof(lepp_cmd_t);
+
+	unsigned int cmd_head, cmd_tail, cmd_next;
+	unsigned int comp_tail;
+
+	lepp_cmd_t cmds[LEPP_MAX_FRAGS];
+
+	unsigned int free_slots;
+
+
+	/*
+	 * This is paranoia, since we think that if the link doesn't come
+	 * up, telling Linux we have no carrier will keep it from trying
+	 * to transmit.  If it does, though, we can't execute this routine,
+	 * since data structures we depend on aren't set up yet.
+	 */
+	if (!info->registered)
+		return NETDEV_TX_BUSY;
+
+
+	/* Save the timestamp. */
+	dev->trans_start = jiffies;
+
+
+#ifdef TILE_NET_PARANOIA
+#if CHIP_HAS_CBOX_HOME_MAP()
+	if (hash_default) {
+		HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data);
+		if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
+			panic("Non-coherent egress buffer!");
+	}
+#endif
+#endif
+
+
+#ifdef TILE_NET_DUMP_PACKETS
+	/* ISSUE: Does not dump the "frags". */
+	dump_packet(data, skb_headlen(skb), "tx");
+#endif /* TILE_NET_DUMP_PACKETS */
+
+
+	if (sh->gso_size != 0)
+		return tile_net_tx_tso(skb, dev);
+
+
+	/* Prepare the commands. */
+
+	num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
+
+	for (i = 0; i < num_frags; i++) {
+
+		bool final = (i == num_frags - 1);
+
+		lepp_cmd_t cmd = {
+			.cpa_lo = frags[i].cpa_lo,
+			.cpa_hi = frags[i].cpa_hi,
+			.length = frags[i].length,
+			.hash_for_home = frags[i].hash_for_home,
+			.send_completion = final,
+			.end_of_packet = final
+		};
+
+		if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) {
+			cmd.compute_checksum = 1;
+			cmd.checksum_data.bits.start_byte = csum_start;
+			cmd.checksum_data.bits.count = len - csum_start;
+			cmd.checksum_data.bits.destination_byte =
+				csum_start + skb->csum_offset;
+		}
+
+		cmds[i] = cmd;
+	}
+
+
+	/* Prefetch and wait, to minimize time spent holding the spinlock. */
+	prefetch_L1(&eq->comp_tail);
+	prefetch_L1(&eq->cmd_tail);
+	mb();
+
+
+	/* Enqueue the commands. */
+
+	spin_lock_irqsave(&priv->cmd_lock, irqflags);
+
+	/*
+	 * Handle completions if needed to make room.
+	 * HACK: Spin until there is sufficient room.
+	 */
+	free_slots = lepp_num_free_comp_slots(eq);
+	if (free_slots < 1) {
+spin:
+		nolds += tile_net_lepp_grab_comps(dev, olds + nolds,
+						  wanted - nolds, NULL);
+		if (lepp_num_free_comp_slots(eq) < 1)
+			goto spin;
+	}
+
+	cmd_head = eq->cmd_head;
+	cmd_tail = eq->cmd_tail;
+
+	/* NOTE: The "gotos" below are untested. */
+
+	/* Copy the commands, or fail. */
+	for (i = 0; i < num_frags; i++) {
+
+		/* Prepare to advance, detecting full queue. */
+		cmd_next = cmd_tail + cmd_size;
+		if (cmd_tail < cmd_head && cmd_next >= cmd_head)
+			goto spin;
+		if (cmd_next > LEPP_CMD_LIMIT) {
+			cmd_next = 0;
+			if (cmd_next == cmd_head)
+				goto spin;
+		}
+
+		/* Copy the command. */
+		*(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i];
+
+		/* Advance. */
+		cmd_tail = cmd_next;
+	}
+
+	/* Record "skb" for eventual freeing. */
+	comp_tail = eq->comp_tail;
+	eq->comps[comp_tail] = skb;
+	LEPP_QINC(comp_tail);
+	eq->comp_tail = comp_tail;
+
+	/* Flush before allowing LEPP to handle the command. */
+	__insn_mf();
+
+	eq->cmd_tail = cmd_tail;
+
+	spin_unlock_irqrestore(&priv->cmd_lock, irqflags);
+
+	if (nolds == 0)
+		nolds = tile_net_lepp_grab_comps(dev, olds, wanted, NULL);
+
+	/* Handle completions. */
+	for (i = 0; i < nolds; i++)
+		kfree_skb(olds[i]);
+
+	/* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */
+	stats->tx_packets++;
+	stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN);
+
+	/* Make sure the egress timer is scheduled. */
+	tile_net_schedule_egress_timer(info);
+
+	return NETDEV_TX_OK;
+}
+
+
+/*
+ * Deal with a transmit timeout.
+ */
+static void tile_net_tx_timeout(struct net_device *dev)
+{
+	PDEBUG("tile_net_tx_timeout()\n");
+	PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
+	       jiffies - dev->trans_start);
+
+	/* XXX: ISSUE: This doesn't seem useful for us. */
+	netif_wake_queue(dev);
+}
+
+
+/*
+ * Ioctl commands.
+ */
+static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	return -EOPNOTSUPP;
+}
+
+
+/*
+ * Get System Network Statistics.
+ *
+ * Returns the address of the device statistics structure.
+ */
+static struct net_device_stats *tile_net_get_stats(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+	u32 rx_packets = 0;
+	u32 tx_packets = 0;
+	u32 rx_bytes = 0;
+	u32 tx_bytes = 0;
+	int i;
+
+	for_each_online_cpu(i) {
+		if (priv->cpu[i]) {
+			rx_packets += priv->cpu[i]->stats.rx_packets;
+			rx_bytes += priv->cpu[i]->stats.rx_bytes;
+			tx_packets += priv->cpu[i]->stats.tx_packets;
+			tx_bytes += priv->cpu[i]->stats.tx_bytes;
+		}
+	}
+
+	priv->stats.rx_packets = rx_packets;
+	priv->stats.rx_bytes = rx_bytes;
+	priv->stats.tx_packets = tx_packets;
+	priv->stats.tx_bytes = tx_bytes;
+
+	return &priv->stats;
+}
+
+
+/*
+ * Change the "mtu".
+ *
+ * The "change_mtu" method is usually not needed.
+ * If you need it, it must be like this.
+ */
+static int tile_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+	PDEBUG("tile_net_change_mtu()\n");
+
+	/* Check ranges. */
+	if ((new_mtu < 68) || (new_mtu > 1500))
+		return -EINVAL;
+
+	/* Accept the value. */
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+
+/*
+ * Change the Ethernet Address of the NIC.
+ *
+ * The hypervisor driver does not support changing MAC address.  However,
+ * the IPP does not do anything with the MAC address, so the address which
+ * gets used on outgoing packets, and which is accepted on incoming packets,
+ * is completely up to the NetIO program or kernel driver which is actually
+ * handling them.
+ *
+ * Returns 0 on success, negative on failure.
+ */
+static int tile_net_set_mac_address(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EINVAL;
+
+	/* ISSUE: Note that "dev_addr" is now a pointer. */
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	return 0;
+}
+
+
+/*
+ * Obtain the MAC address from the hypervisor.
+ * This must be done before opening the device.
+ */
+static int tile_net_get_mac(struct net_device *dev)
+{
+	struct tile_net_priv *priv = netdev_priv(dev);
+
+	char hv_dev_name[32];
+	int len;
+
+	__netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF };
+
+	int ret;
+
+	/* For example, "xgbe0". */
+	strcpy(hv_dev_name, dev->name);
+	len = strlen(hv_dev_name);
+
+	/* For example, "xgbe/0". */
+	hv_dev_name[len] = hv_dev_name[len - 1];
+	hv_dev_name[len - 1] = '/';
+	len++;
+
+	/* For example, "xgbe/0/native_hash". */
+	strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native");
+
+	/* Get the hypervisor handle for this device. */
+	priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0);
+	PDEBUG("hv_dev_open(%s) returned %d %p\n",
+	       hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl);
+	if (priv->hv_devhdl < 0) {
+		if (priv->hv_devhdl == HV_ENODEV)
+			printk(KERN_DEBUG "Ignoring unconfigured device %s\n",
+				 hv_dev_name);
+		else
+			printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n",
+				 hv_dev_name, priv->hv_devhdl);
+		return -1;
+	}
+
+	/*
+	 * Read the hardware address from the hypervisor.
+	 * ISSUE: Note that "dev_addr" is now a pointer.
+	 */
+	offset.bits.class = NETIO_PARAM;
+	offset.bits.addr = NETIO_PARAM_MAC;
+	ret = hv_dev_pread(priv->hv_devhdl, 0,
+			   (HV_VirtAddr)dev->dev_addr, dev->addr_len,
+			   offset.word);
+	PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret);
+	if (ret <= 0) {
+		printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n",
+		       dev->name);
+		/*
+		 * Since the device is configured by the hypervisor but we
+		 * can't get its MAC address, we are most likely running
+		 * the simulator, so let's generate a random MAC address.
+		 */
+		random_ether_addr(dev->dev_addr);
+	}
+
+	return 0;
+}
+
+
+static struct net_device_ops tile_net_ops = {
+	.ndo_open = tile_net_open,
+	.ndo_stop = tile_net_stop,
+	.ndo_start_xmit = tile_net_tx,
+	.ndo_do_ioctl = tile_net_ioctl,
+	.ndo_get_stats = tile_net_get_stats,
+	.ndo_change_mtu = tile_net_change_mtu,
+	.ndo_tx_timeout = tile_net_tx_timeout,
+	.ndo_set_mac_address = tile_net_set_mac_address
+};
+
+
+/*
+ * The setup function.
+ *
+ * This uses ether_setup() to assign various fields in dev, including
+ * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
+ */
+static void tile_net_setup(struct net_device *dev)
+{
+	PDEBUG("tile_net_setup()\n");
+
+	ether_setup(dev);
+
+	dev->netdev_ops = &tile_net_ops;
+
+	dev->watchdog_timeo = TILE_NET_TIMEOUT;
+
+	/* We want lockless xmit. */
+	dev->features |= NETIF_F_LLTX;
+
+	/* We support hardware tx checksums. */
+	dev->features |= NETIF_F_HW_CSUM;
+
+	/* We support scatter/gather. */
+	dev->features |= NETIF_F_SG;
+
+	/* We support TSO. */
+	dev->features |= NETIF_F_TSO;
+
+#ifdef TILE_NET_GSO
+	/* We support GSO. */
+	dev->features |= NETIF_F_GSO;
+#endif
+
+	if (hash_default)
+		dev->features |= NETIF_F_HIGHDMA;
+
+	/* ISSUE: We should support NETIF_F_UFO. */
+
+	dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN;
+
+	dev->mtu = TILE_NET_MTU;
+}
+
+
+/*
+ * Allocate the device structure, register the device, and obtain the
+ * MAC address from the hypervisor.
+ */
+static struct net_device *tile_net_dev_init(const char *name)
+{
+	int ret;
+	struct net_device *dev;
+	struct tile_net_priv *priv;
+	struct page *page;
+
+	/*
+	 * Allocate the device structure.  This allocates "priv", calls
+	 * tile_net_setup(), and saves "name".  Normally, "name" is a
+	 * template, instantiated by register_netdev(), but not for us.
+	 */
+	dev = alloc_netdev(sizeof(*priv), name, tile_net_setup);
+	if (!dev) {
+		pr_err("alloc_netdev(%s) failed\n", name);
+		return NULL;
+	}
+
+	priv = netdev_priv(dev);
+
+	/* Initialize "priv". */
+
+	memset(priv, 0, sizeof(*priv));
+
+	/* Save "dev" for "tile_net_open_retry()". */
+	priv->dev = dev;
+
+	INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry);
+
+	spin_lock_init(&priv->cmd_lock);
+	spin_lock_init(&priv->comp_lock);
+
+	/* Allocate "epp_queue". */
+	BUG_ON(get_order(sizeof(lepp_queue_t)) != 0);
+	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
+	if (!page) {
+		free_netdev(dev);
+		return NULL;
+	}
+	priv->epp_queue = page_address(page);
+
+	/* Register the network device. */
+	ret = register_netdev(dev);
+	if (ret) {
+		pr_err("register_netdev %s failed %d\n", dev->name, ret);
+		free_page((unsigned long)priv->epp_queue);
+		free_netdev(dev);
+		return NULL;
+	}
+
+	/* Get the MAC address. */
+	ret = tile_net_get_mac(dev);
+	if (ret < 0) {
+		unregister_netdev(dev);
+		free_page((unsigned long)priv->epp_queue);
+		free_netdev(dev);
+		return NULL;
+	}
+
+	return dev;
+}
+
+
+/*
+ * Module cleanup.
+ */
+static void tile_net_cleanup(void)
+{
+	int i;
+
+	for (i = 0; i < TILE_NET_DEVS; i++) {
+		if (tile_net_devs[i]) {
+			struct net_device *dev = tile_net_devs[i];
+			struct tile_net_priv *priv = netdev_priv(dev);
+			unregister_netdev(dev);
+			finv_buffer(priv->epp_queue, PAGE_SIZE);
+			free_page((unsigned long)priv->epp_queue);
+			free_netdev(dev);
+		}
+	}
+}
+
+
+/*
+ * Module initialization.
+ */
+static int tile_net_init_module(void)
+{
+	pr_info("Tilera IPP Net Driver\n");
+
+	tile_net_devs[0] = tile_net_dev_init("xgbe0");
+	tile_net_devs[1] = tile_net_dev_init("xgbe1");
+	tile_net_devs[2] = tile_net_dev_init("gbe0");
+	tile_net_devs[3] = tile_net_dev_init("gbe1");
+
+	return 0;
+}
+
+
+#ifndef MODULE
+/*
+ * The "network_cpus" boot argument specifies the cpus that are dedicated
+ * to handle ingress packets.
+ *
+ * The parameter should be in the form "network_cpus=m-n[,x-y]", where
+ * m, n, x, y are integer numbers that represent the cpus that can be
+ * neither a dedicated cpu nor a dataplane cpu.
+ */
+static int __init network_cpus_setup(char *str)
+{
+	int rc = cpulist_parse_crop(str, &network_cpus_map);
+	if (rc != 0) {
+		pr_warning("network_cpus=%s: malformed cpu list\n",
+		       str);
+	} else {
+
+		/* Remove dedicated cpus. */
+		cpumask_and(&network_cpus_map, &network_cpus_map,
+			    cpu_possible_mask);
+
+
+		if (cpumask_empty(&network_cpus_map)) {
+			pr_warning("Ignoring network_cpus='%s'.\n",
+			       str);
+		} else {
+			char buf[1024];
+			cpulist_scnprintf(buf, sizeof(buf), &network_cpus_map);
+			pr_info("Linux network CPUs: %s\n", buf);
+			network_cpus_used = true;
+		}
+	}
+
+	return 0;
+}
+__setup("network_cpus=", network_cpus_setup);
+#endif
+
+
+module_init(tile_net_init_module);
+module_exit(tile_net_cleanup);