tile: Move the Tilera driver

Move the Tilera driver into drivers/net/ethernet/tile and
make the necessary Kconfig and Makefile changes.

Updated the Kconfig so that the options defualt to y if TILE kernel.

CC: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 0 insertions, 2475 deletions

diff --git a/drivers/net/tile/Makefile b/drivers/net/tile/Makefile
deleted file mode 100644
index f634f14..0000000
--- a/drivers/net/tile/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-#
-# 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
deleted file mode 100644
index 1e2af96..0000000
--- a/drivers/net/tile/tilepro.c
+++ /dev/null
@@ -1,2465 +0,0 @@
-/*
- * Copyright 2011 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>
-
-
-/*
- * 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()".
- *
- * HACK: Since disabling the ingress interrupt is not reliable, we
- * ignore the interrupt if the global "active" flag is false.
- *
- *
- * NOTE: The use of "native_driver" ensures that EPP exists, and that
- * we are using "LIPP" and "LEPP".
- *
- * 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.
- */
-
-
-/* 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");
-
-
-/*
- * 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;
-	/* True iff NAPI is enabled. */
-	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;
-	/* Pages making up the egress queue. */
-	struct page *eq_pages;
-	/* Address of the actual egress queue. */
-	lepp_queue_t *eq;
-	/* Protects "eq". */
-	spinlock_t eq_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. */
-	bool partly_opened;
-	/* True iff the device is "active". */
-	bool active;
-	/* 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];
-};
-
-/* Log2 of the number of small pages needed for the egress queue. */
-#define EQ_ORDER  get_order(sizeof(lepp_queue_t))
-/* Size of the egress queue's pages. */
-#define EQ_SIZE   (1 << (PAGE_SHIFT + EQ_ORDER))
-
-/*
- * 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)
-{
-	int my_cpu = smp_processor_id();
-
-	unsigned long i;
-	char buf[128];
-
-	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, "[%02d] %8.8lx:", my_cpu, i);
-		sprintf(buf + strlen(buf), " %2.2x", data[i]);
-		if ((i & 0xf) == 0xf || i == length - 1) {
-			strcat(buf, "\n");
-			pr_info("%s", 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.
- *
- * Note that the ACTUAL allocation for each buffer is a "struct sk_buff",
- * plus a chunk of memory that includes not only the requested bytes, but
- * also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info".
- *
- * Note that "struct skb_shared_info" is 88 bytes with 64K pages and
- * 268 bytes with 4K pages (since the frags[] array needs 18 entries).
- *
- * Without jumbo packets, the maximum packet size will be 1536 bytes,
- * and we use 2 bytes (NET_IP_ALIGN) of padding.  ISSUE: If we told
- * the hardware to clip at 1518 bytes instead of 1536 bytes, then we
- * could save an entire cache line, but in practice, we don't need it.
- *
- * 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.
- *
- * We assume that the underlying "head" will be aligned mod 64.  Note
- * that in practice, we have seen "head" NOT aligned mod 128 even when
- * using 2048 byte allocations, which is surprising.
- *
- * If "head" WAS always aligned mod 128, we could change LIPP to
- * assume that the low SIX bits are zero, and the 7th bit is one, that
- * is, align the actual "va" mod 128 plus 64, which would be "free".
- *
- * For now, the actual "head" pointer points at NET_SKB_PAD bytes of
- * padding, plus 28 or 92 bytes of extra padding, plus the sk_buff
- * pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for
- * the actual packet, plus 62 bytes of empty padding, plus some
- * padding and the "struct skb_shared_info".
- *
- * With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88
- * bytes, or 1816 bytes, which fits comfortably into 2048 bytes.
- *
- * With 64K pages, a small buffer thus needs 32+92+4+2+126+88
- * bytes, or 344 bytes, which means we are wasting 64+ bytes, and
- * could presumably increase the size of small buffers.
- *
- * With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268
- * bytes, or 1996 bytes, which fits comfortably into 2048 bytes.
- *
- * With 4K pages, a small buffer thus needs 32+92+4+2+126+268
- * bytes, or 524 bytes, which is annoyingly wasteful.
- *
- * Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192?
- *
- * ISSUE: Maybe we should increase "NET_SKB_PAD" to 64?
- */
-static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
-					   bool small)
-{
-#if TILE_NET_MTU <= 1536
-	/* Without "jumbo", 2 + 1536 should be sufficient. */
-	unsigned int large_size = NET_IP_ALIGN + 1536;
-#else
-	/* ISSUE: This has not been tested. */
-	unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
-#endif
-
-	/* Avoid "false sharing" with last cache line. */
-	/* ISSUE: This is already done by "dev_alloc_skb()". */
-	unsigned int len =
-		 (((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
-		   CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
-
-	unsigned int padding = 128 - NET_SKB_PAD;
-	unsigned int align;
-
-	struct sk_buff *skb;
-	void *va;
-
-	struct sk_buff **skb_ptr;
-
-	/* Request 96 extra bytes for alignment purposes. */
-	skb = dev_alloc_skb(len + padding);
-	if (skb == NULL)
-		return false;
-
-	/* Skip 32 or 96 bytes to align "data" mod 128. */
-	align = -(long)skb->data & (128 - 1);
-	BUG_ON(align > padding);
-	skb_reserve(skb, align);
-
-	/* This address is given to IPP. */
-	va = skb->data;
-
-	/* Buffers must not span a huge page. */
-	BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0);
-
-#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-HFH ingress buffer! VA=%p Mode=%d PTE=%llx",
-			      va, hv_pte_get_mode(pte), hv_pte_val(pte));
-	}
-#endif
-#endif
-
-	/* Invalidate the packet buffer. */
-	if (!hash_default)
-		__inv_buffer(va, len);
-
-	/* 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;
-
-	/* Make sure "skb_ptr" has been flushed. */
-	__insn_mf();
-
-	/* 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.
- */
-static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq,
-					     struct sk_buff *comps[],
-					     unsigned int comps_size,
-					     unsigned int min_size)
-{
-	unsigned int n = 0;
-
-	unsigned int comp_head = eq->comp_head;
-	unsigned int comp_busy = eq->comp_busy;
-
-	while (comp_head != comp_busy && n < comps_size) {
-		comps[n++] = eq->comps[comp_head];
-		LEPP_QINC(comp_head);
-	}
-
-	if (n < min_size)
-		return 0;
-
-	eq->comp_head = comp_head;
-
-	return n;
-}
-
-
-/*
- * Free some comps, and return true iff there are still some pending.
- */
-static bool tile_net_lepp_free_comps(struct net_device *dev, bool all)
-{
-	struct tile_net_priv *priv = netdev_priv(dev);
-
-	lepp_queue_t *eq = priv->eq;
-
-	struct sk_buff *olds[64];
-	unsigned int wanted = 64;
-	unsigned int i, n;
-	bool pending;
-
-	spin_lock(&priv->eq_lock);
-
-	if (all)
-		eq->comp_busy = eq->comp_tail;
-
-	n = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
-
-	pending = (eq->comp_head != eq->comp_tail);
-
-	spin_unlock(&priv->eq_lock);
-
-	for (i = 0; i < n; i++)
-		kfree_skb(olds[i]);
-
-	return pending;
-}
-
-
-/*
- * 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;
-
-	/* The timer is no longer scheduled. */
-	info->egress_timer_scheduled = false;
-
-	/* Free comps, and reschedule timer if more are pending. */
-	if (tile_net_lepp_free_comps(dev, false))
-		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
-
-
-
-static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
-{
-	struct tile_netio_queue *queue = &info->queue;
-	netio_queue_impl_t *qsp = queue->__system_part;
-	netio_queue_user_impl_t *qup = &queue->__user_part;
-
-	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;
-}
-
-
-/*
- * Like "tile_net_poll()", 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;
-		tile_net_discard_aux(info, index);
-	}
-}
-
-
-/*
- * 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.  FIXME: Shouldn't the second line */
-	/* get subtracted?  Mostly moot, since it should be "zero". */
-	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;
-
-	/* 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)) {
-		/* Bug 6624: Includes UDP packets with a "zero" checksum. */
-		pr_warning("Bad L4 checksum on %d byte packet.\n", len);
-	}
-	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:
-		pr_warning("Unexpected BAD %ld byte packet.\n", len);
-	}
-#endif
-
-	filter = 0;
-
-	/* ISSUE: Filter TCP packets with "bad" checksums? */
-
-	if (!(dev->flags & IFF_UP)) {
-		/* Filter packets received before we're up. */
-		filter = 1;
-	} else if (NETIO_PKT_STATUS_M(metadata, pkt) == NETIO_PKT_STATUS_BAD) {
-		/* Filter "truncated" packets. */
-		filter = 1;
-	} else if (!(dev->flags & IFF_PROMISC)) {
-		/* FIXME: Implement HW multicast filter. */
-		if (!is_multicast_ether_addr(buf)) {
-			/* Filter packets not for our address. */
-			const u8 *mine = dev->dev_addr;
-			filter = compare_ether_addr(mine, buf);
-		}
-	}
-
-	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);
-
-		/* Avoid recomputing "good" 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.
- *
- * If "tile_net_stop()" is called on some other tile while this
- * function is running, we will return, hopefully before that
- * other tile asks us to call "napi_disable()".
- *
- * The "rotting packet" race condition occurs if a packet arrives
- * during the extremely narrow window between the queue appearing to
- * be empty, and the ingress interrupt being re-enabled.  This happens
- * a LOT under heavy network load.
- */
-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 (priv->active) {
-		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);
-
-	if (!priv->active)
-		goto done;
-
-	/* Re-enable the ingress interrupt. */
-	enable_percpu_irq(priv->intr_id);
-
-	/* HACK: Avoid the "rotting packet" problem (see above). */
-	if (qup->__packet_receive_read !=
-	    qsp->__packet_receive_queue.__packet_write) {
-		/* ISSUE: Sometimes this returns zero, presumably */
-		/* because an interrupt was handled for this tile. */
-		(void)napi_reschedule(&info->napi);
-	}
-
-done:
-
-	if (priv->active)
-		tile_net_provide_needed_buffers(info);
-
-	return work;
-}
-
-
-/*
- * Handle an ingress interrupt for the given device on the current cpu.
- *
- * ISSUE: Sometimes this gets called after "disable_percpu_irq()" has
- * been called!  This is probably due to "pending hypervisor downcalls".
- *
- * ISSUE: Is there any race condition between the "napi_schedule()" here
- * and the "napi_complete()" call above?
- */
-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 the ingress interrupt. */
-	disable_percpu_irq(priv->intr_id);
-
-	/* Ignore unwanted interrupts. */
-	if (!priv->active)
-		return IRQ_HANDLED;
-
-	/* ISSUE: Sometimes "info->napi_enabled" is false here. */
-
-	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);
-		homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home);
-	}
-
-	/*
-	 * Register the EPP shared memory queue.
-	 */
-	{
-		netio_ipp_address_t ea = {
-			.va = 0,
-			.pa = __pa(priv->eq),
-			.pte = hv_pte(0),
-			.size = EQ_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 the current 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 LIPP.  This does a lot of stuff,
-	 * including invoking the LIPP registration code.
-	 */
-	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) {
-		if (ret != NETIO_LINK_DOWN) {
-			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);
-
-	/* Now we are registered. */
-	info->registered = true;
-}
-
-
-/*
- * Deregister with hypervisor on the current CPU.
- *
- * This simply discards all our credits, so no more packets will be
- * delivered to this tile.  There may still be packets in our queue.
- *
- * Also, disable the ingress interrupt.
- */
-static void tile_net_deregister(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 the ingress interrupt. */
-	disable_percpu_irq(priv->intr_id);
-
-	/* Do nothing else if not registered. */
-	if (info == NULL || !info->registered)
-		return;
-
-	{
-		struct tile_netio_queue *queue = &info->queue;
-		netio_queue_user_impl_t *qup = &queue->__user_part;
-
-		/* Discard all our credits. */
-		__netio_fastio_return_credits(qup->__fastio_index, -1);
-	}
-}
-
-
-/*
- * Unregister with hypervisor on the current CPU.
- *
- * Also, disable the ingress interrupt.
- */
-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;
-	int dummy = 0;
-
-	/* Disable the ingress interrupt. */
-	disable_percpu_irq(priv->intr_id);
-
-	/* Do nothing else if not registered. */
-	if (info == NULL || !info->registered)
-		return;
-
-	/* Unregister ourselves with LIPP/LEPP. */
-	ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
-			    sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
-	if (ret < 0)
-		panic("Failed to unregister with LIPP/LEPP!\n");
-
-	/* Discard all packets still in our NetIO queue. */
-	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;
-}
-
-
-/*
- * Helper function for "tile_net_stop()".
- *
- * Also used to handle registration failure in "tile_net_open_inner()",
- * when the various extra steps in "tile_net_stop()" are not necessary.
- */
-static void tile_net_stop_aux(struct net_device *dev)
-{
-	struct tile_net_priv *priv = netdev_priv(dev);
-	int i;
-
-	int dummy = 0;
-
-	/*
-	 * Unregister all tiles, so LIPP will stop delivering packets.
-	 * Also, delete all the "napi" objects (sequentially, to protect
-	 * "dev->napi_list").
-	 */
-	on_each_cpu(tile_net_unregister, (void *)dev, 1);
-	for_each_online_cpu(i) {
-		struct tile_net_cpu *info = priv->cpu[i];
-		if (info != NULL && info->registered) {
-			netif_napi_del(&info->napi);
-			info->registered = false;
-		}
-	}
-
-	/* 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 NAPI for the given device on the current cpu.
- */
-static void tile_net_stop_disable(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 NAPI if needed. */
-	if (info != NULL && info->napi_enabled) {
-		napi_disable(&info->napi);
-		info->napi_enabled = false;
-	}
-}
-
-
-/*
- * Enable NAPI and the ingress interrupt for the given device
- * on the current cpu.
- *
- * ISSUE: Only do this for "network cpus"?
- */
-static void tile_net_open_enable(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 NAPI. */
-	napi_enable(&info->napi);
-	info->napi_enabled = true;
-
-	/* Enable the ingress interrupt. */
-	enable_percpu_irq(priv->intr_id);
-}
-
-
-/*
- * 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;
-	int result = 0;
-	int i;
-	int dummy = 0;
-
-	/*
-	 * 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()".  Also, add all the
-	 * "napi" objects (sequentially, to protect "dev->napi_list").
-	 * ISSUE: Only use "netif_napi_add()" for "network cpus"?
-	 */
-	smp_call_function(tile_net_register, (void *)dev, 1);
-	for_each_online_cpu(i) {
-		struct tile_net_cpu *info = priv->cpu[i];
-		if (info->registered)
-			netif_napi_add(dev, &info->napi, tile_net_poll, 64);
-		else
-			result = -EAGAIN;
-	}
-	if (result != 0) {
-		tile_net_stop_aux(dev);
-		return result;
-	}
-
-	queue = &info->queue;
-
-	if (priv->intr_id == 0) {
-		unsigned int irq;
-
-		/*
-		 * Acquire the irq allocated by the hypervisor.  Every
-		 * queue gets the same irq.  The "__intr_id" field is
-		 * "1 << irq", so we use "__ffs()" to extract "irq".
-		 */
-		priv->intr_id = queue->__system_part->__intr_id;
-		BUG_ON(priv->intr_id == 0);
-		irq = __ffs(priv->intr_id);
-
-		/*
-		 * Register the ingress interrupt handler for this
-		 * device, permanently.
-		 *
-		 * We used to call "free_irq()" in "tile_net_stop()",
-		 * and then re-register the handler here every time,
-		 * but that caused DNP errors in "handle_IRQ_event()"
-		 * because "desc->action" was NULL.  See bug 9143.
-		 */
-		tile_irq_activate(irq, TILE_IRQ_PERCPU);
-		BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
-				   0, dev->name, (void *)dev) != 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!");
-	}
-
-	/* We are about to be active. */
-	priv->active = true;
-
-	/* Make sure "active" is visible to all tiles. */
-	mb();
-
-	/* On each tile, enable NAPI and the ingress interrupt. */
-	on_each_cpu(tile_net_open_enable, (void *)dev, 1);
-
-	/* 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");
-
-	/* 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) != 0)
-		schedule_delayed_work(&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 (if needed), 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;
-
-	} else {
-		/* FIXME: Is this possible? */
-		/* printk("Already partly opened.\n"); */
-	}
-
-	/*
-	 * 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(&priv->retry_work, TILE_NET_RETRY_INTERVAL);
-
-	return 0;
-}
-
-
-static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
-{
-	int n = 0;
-
-	/* 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);
-		}
-
-		n++;
-	}
-
-	return n;
-}
-
-
-/*
- * 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: How closely does "netif_running(dev)" mirror "priv->active"?
- *
- * Before we are called by "__dev_close()", "netif_running()" will
- * have been cleared, so no NEW calls to "tile_net_poll()" will be
- * made by "netpoll_poll_dev()".
- *
- * Often, this can cause some tiles to still have packets in their
- * queues, so we must call "tile_net_discard_packets()" later.
- *
- * Note that some other tile may still be INSIDE "tile_net_poll()",
- * and in fact, many will be, if there is heavy network load.
- *
- * Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when
- * any tile is still "napi_schedule()"'d will induce a horrible crash
- * when "msleep()" is called.  This includes tiles which are inside
- * "tile_net_poll()" which have not yet called "napi_complete()".
- *
- * So, we must first try to wait long enough for other tiles to finish
- * with any current "tile_net_poll()" call, and, hopefully, to clear
- * the "scheduled" flag.  ISSUE: It is unclear what happens to tiles
- * which have called "napi_schedule()" but which had not yet tried to
- * call "tile_net_poll()", or which exhausted their budget inside
- * "tile_net_poll()" just before this function was called.
- */
-static int tile_net_stop(struct net_device *dev)
-{
-	struct tile_net_priv *priv = netdev_priv(dev);
-
-	PDEBUG("tile_net_stop()\n");
-
-	/* Start discarding packets. */
-	priv->active = false;
-
-	/* Make sure "active" is visible to all tiles. */
-	mb();
-
-	/*
-	 * On each tile, make sure no NEW packets get delivered, and
-	 * disable the ingress interrupt.
-	 *
-	 * Note that the ingress interrupt can fire AFTER this,
-	 * presumably due to packets which were recently delivered,
-	 * but it will have no effect.
-	 */
-	on_each_cpu(tile_net_deregister, (void *)dev, 1);
-
-	/* Optimistically drain LIPP buffers. */
-	(void)tile_net_drain_lipp_buffers(priv);
-
-	/* 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 NAPI on each tile. */
-	on_each_cpu(tile_net_stop_disable, (void *)dev, 1);
-
-	/*
-	 * Drain any remaining LIPP buffers.  NOTE: This "printk()"
-	 * has never been observed, but in theory it could happen.
-	 */
-	if (tile_net_drain_lipp_buffers(priv) != 0)
-		printk("Had to drain some extra LIPP buffers!\n");
-
-	/* Stop LIPP/LEPP. */
-	tile_net_stop_aux(dev);
-
-	/*
-	 * ISSUE: It appears that, in practice anyway, by the time we
-	 * get here, there are no pending completions, but just in case,
-	 * we free (all of) them anyway.
-	 */
-	while (tile_net_lepp_free_comps(dev, true))
-		/* loop */;
-
-	/* Wipe the EPP queue, and wait till the stores hit the EPP. */
-	memset(priv->eq, 0, sizeof(lepp_queue_t));
-	mb();
-
-	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, 0);
-
-		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, 0);
-		}
-
-		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->eq;
-
-	struct sk_buff *olds[8];
-	unsigned int wanted = 8;
-	unsigned int i, nolds = 0;
-
-	unsigned int cmd_head, cmd_tail, cmd_next;
-	unsigned int comp_tail;
-
-
-	/* 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->eq_lock, irqflags);
-
-	/*
-	 * Handle completions if needed to make room.
-	 * HACK: Spin until there is sufficient room.
-	 */
-	if (lepp_num_free_comp_slots(eq) == 0) {
-		nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
-		if (nolds == 0) {
-busy:
-			spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-			return NETDEV_TX_BUSY;
-		}
-	}
-
-	cmd_head = eq->cmd_head;
-	cmd_tail = eq->cmd_tail;
-
-	/* Prepare to advance, detecting full queue. */
-	cmd_next = cmd_tail + cmd_size;
-	if (cmd_tail < cmd_head && cmd_next >= cmd_head)
-		goto busy;
-	if (cmd_next > LEPP_CMD_LIMIT) {
-		cmd_next = 0;
-		if (cmd_next == cmd_head)
-			goto busy;
-	}
-
-	/* 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. */
-	/* ISSUE: Is this the optimal location for the flush? */
-	__insn_mf();
-
-	eq->cmd_tail = cmd_tail;
-
-	/* NOTE: Using "4" here is more efficient than "0" or "2", */
-	/* and, strangely, more efficient than pre-checking the number */
-	/* of available completions, and comparing it to 4. */
-	if (nolds == 0)
-		nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
-	spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
-	/* 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_checksum_start_offset(skb);
-
-	lepp_frag_t frags[LEPP_MAX_FRAGS];
-
-	unsigned int num_frags;
-
-	lepp_queue_t *eq = priv->eq;
-
-	struct sk_buff *olds[8];
-	unsigned int wanted = 8;
-	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];
-
-
-	/*
-	 * 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-HFH egress buffer! VA=%p Mode=%d PTE=%llx",
-			      data, hv_pte_get_mode(pte), hv_pte_val(pte));
-	}
-#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->eq_lock, irqflags);
-
-	/*
-	 * Handle completions if needed to make room.
-	 * HACK: Spin until there is sufficient room.
-	 */
-	if (lepp_num_free_comp_slots(eq) == 0) {
-		nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
-		if (nolds == 0) {
-busy:
-			spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-			return NETDEV_TX_BUSY;
-		}
-	}
-
-	cmd_head = eq->cmd_head;
-	cmd_tail = eq->cmd_tail;
-
-	/* 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 busy;
-		if (cmd_next > LEPP_CMD_LIMIT) {
-			cmd_next = 0;
-			if (cmd_next == cmd_head)
-				goto busy;
-		}
-
-		/* 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. */
-	/* ISSUE: Is this the optimal location for the flush? */
-	__insn_mf();
-
-	eq->cmd_tail = cmd_tail;
-
-	/* NOTE: Using "4" here is more efficient than "0" or "2", */
-	/* and, strangely, more efficient than pre-checking the number */
-	/* of available completions, and comparing it to 4. */
-	if (nolds == 0)
-		nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
-	spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
-	/* 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;
-
-	/*
-	 * 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->eq_lock);
-
-	/* Allocate "eq". */
-	priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER);
-	if (!priv->eq_pages) {
-		free_netdev(dev);
-		return NULL;
-	}
-	priv->eq = page_address(priv->eq_pages);
-
-	/* Register the network device. */
-	ret = register_netdev(dev);
-	if (ret) {
-		pr_err("register_netdev %s failed %d\n", dev->name, ret);
-		__free_pages(priv->eq_pages, EQ_ORDER);
-		free_netdev(dev);
-		return NULL;
-	}
-
-	/* Get the MAC address. */
-	ret = tile_net_get_mac(dev);
-	if (ret < 0) {
-		unregister_netdev(dev);
-		__free_pages(priv->eq_pages, EQ_ORDER);
-		free_netdev(dev);
-		return NULL;
-	}
-
-	return dev;
-}
-
-
-/*
- * Module cleanup.
- *
- * FIXME: If compiled as a module, this module cannot be "unloaded",
- * because the "ingress interrupt handler" is registered permanently.
- */
-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_remote(priv->eq, EQ_SIZE, 0);
-			__free_pages(priv->eq_pages, EQ_ORDER);
-			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;
-}
-
-
-module_init(tile_net_init_module);
-module_exit(tile_net_cleanup);
-
-
-#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