Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 776 insertions, 0 deletions

diff --git a/drivers/mtd/inftlmount.c b/drivers/mtd/inftlmount.c
new file mode 100644
index 000000000..6276daa29
--- /dev/null
+++ b/drivers/mtd/inftlmount.c
@@ -0,0 +1,776 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * inftlmount.c -- INFTL mount code with extensive checks.
+ *
+ * Author: Greg Ungerer (gerg@snapgear.com)
+ * Copyright © 2002-2003, Greg Ungerer (gerg@snapgear.com)
+ *
+ * Based heavily on the nftlmount.c code which is:
+ * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
+ * Copyright © 2000 Netgem S.A.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nftl.h>
+#include <linux/mtd/inftl.h>
+
+/*
+ * find_boot_record: Find the INFTL Media Header and its Spare copy which
+ *	contains the various device information of the INFTL partition and
+ *	Bad Unit Table. Update the PUtable[] table according to the Bad
+ *	Unit Table. PUtable[] is used for management of Erase Unit in
+ *	other routines in inftlcore.c and inftlmount.c.
+ */
+static int find_boot_record(struct INFTLrecord *inftl)
+{
+	struct inftl_unittail h1;
+	//struct inftl_oob oob;
+	unsigned int i, block;
+	u8 buf[SECTORSIZE];
+	struct INFTLMediaHeader *mh = &inftl->MediaHdr;
+	struct mtd_info *mtd = inftl->mbd.mtd;
+	struct INFTLPartition *ip;
+	size_t retlen;
+
+	pr_debug("INFTL: find_boot_record(inftl=%p)\n", inftl);
+
+        /*
+	 * Assume logical EraseSize == physical erasesize for starting the
+	 * scan. We'll sort it out later if we find a MediaHeader which says
+	 * otherwise.
+	 */
+	inftl->EraseSize = inftl->mbd.mtd->erasesize;
+        inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
+
+	inftl->MediaUnit = BLOCK_NIL;
+
+	/* Search for a valid boot record */
+	for (block = 0; block < inftl->nb_blocks; block++) {
+		int ret;
+
+		/*
+		 * Check for BNAND header first. Then whinge if it's found
+		 * but later checks fail.
+		 */
+		ret = mtd_read(mtd, block * inftl->EraseSize, SECTORSIZE,
+			       &retlen, buf);
+		/* We ignore ret in case the ECC of the MediaHeader is invalid
+		   (which is apparently acceptable) */
+		if (retlen != SECTORSIZE) {
+			static int warncount = 5;
+
+			if (warncount) {
+				printk(KERN_WARNING "INFTL: block read at 0x%x "
+					"of mtd%d failed: %d\n",
+					block * inftl->EraseSize,
+					inftl->mbd.mtd->index, ret);
+				if (!--warncount)
+					printk(KERN_WARNING "INFTL: further "
+						"failures for this block will "
+						"not be printed\n");
+			}
+			continue;
+		}
+
+		if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
+			/* BNAND\0 not found. Continue */
+			continue;
+		}
+
+		/* To be safer with BIOS, also use erase mark as discriminant */
+		ret = inftl_read_oob(mtd,
+				     block * inftl->EraseSize + SECTORSIZE + 8,
+				     8, &retlen,(char *)&h1);
+		if (ret < 0) {
+			printk(KERN_WARNING "INFTL: ANAND header found at "
+				"0x%x in mtd%d, but OOB data read failed "
+				"(err %d)\n", block * inftl->EraseSize,
+				inftl->mbd.mtd->index, ret);
+			continue;
+		}
+
+
+		/*
+		 * This is the first we've seen.
+		 * Copy the media header structure into place.
+		 */
+		memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
+
+		/* Read the spare media header at offset 4096 */
+		mtd_read(mtd, block * inftl->EraseSize + 4096, SECTORSIZE,
+			 &retlen, buf);
+		if (retlen != SECTORSIZE) {
+			printk(KERN_WARNING "INFTL: Unable to read spare "
+			       "Media Header\n");
+			return -1;
+		}
+		/* Check if this one is the same as the first one we found. */
+		if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
+			printk(KERN_WARNING "INFTL: Primary and spare Media "
+			       "Headers disagree.\n");
+			return -1;
+		}
+
+		mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
+		mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
+		mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
+		mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
+		mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
+		mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
+
+		pr_debug("INFTL: Media Header ->\n"
+			 "    bootRecordID          = %s\n"
+			 "    NoOfBootImageBlocks   = %d\n"
+			 "    NoOfBinaryPartitions  = %d\n"
+			 "    NoOfBDTLPartitions    = %d\n"
+			 "    BlockMultiplierBits   = %d\n"
+			 "    FormatFlgs            = %d\n"
+			 "    OsakVersion           = 0x%x\n"
+			 "    PercentUsed           = %d\n",
+			 mh->bootRecordID, mh->NoOfBootImageBlocks,
+			 mh->NoOfBinaryPartitions,
+			 mh->NoOfBDTLPartitions,
+			 mh->BlockMultiplierBits, mh->FormatFlags,
+			 mh->OsakVersion, mh->PercentUsed);
+
+		if (mh->NoOfBDTLPartitions == 0) {
+			printk(KERN_WARNING "INFTL: Media Header sanity check "
+				"failed: NoOfBDTLPartitions (%d) == 0, "
+				"must be at least 1\n", mh->NoOfBDTLPartitions);
+			return -1;
+		}
+
+		if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
+			printk(KERN_WARNING "INFTL: Media Header sanity check "
+				"failed: Total Partitions (%d) > 4, "
+				"BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
+				mh->NoOfBinaryPartitions,
+				mh->NoOfBDTLPartitions,
+				mh->NoOfBinaryPartitions);
+			return -1;
+		}
+
+		if (mh->BlockMultiplierBits > 1) {
+			printk(KERN_WARNING "INFTL: sorry, we don't support "
+				"UnitSizeFactor 0x%02x\n",
+				mh->BlockMultiplierBits);
+			return -1;
+		} else if (mh->BlockMultiplierBits == 1) {
+			printk(KERN_WARNING "INFTL: support for INFTL with "
+				"UnitSizeFactor 0x%02x is experimental\n",
+				mh->BlockMultiplierBits);
+			inftl->EraseSize = inftl->mbd.mtd->erasesize <<
+				mh->BlockMultiplierBits;
+			inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
+			block >>= mh->BlockMultiplierBits;
+		}
+
+		/* Scan the partitions */
+		for (i = 0; (i < 4); i++) {
+			ip = &mh->Partitions[i];
+			ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
+			ip->firstUnit = le32_to_cpu(ip->firstUnit);
+			ip->lastUnit = le32_to_cpu(ip->lastUnit);
+			ip->flags = le32_to_cpu(ip->flags);
+			ip->spareUnits = le32_to_cpu(ip->spareUnits);
+			ip->Reserved0 = le32_to_cpu(ip->Reserved0);
+
+			pr_debug("    PARTITION[%d] ->\n"
+				 "        virtualUnits    = %d\n"
+				 "        firstUnit       = %d\n"
+				 "        lastUnit        = %d\n"
+				 "        flags           = 0x%x\n"
+				 "        spareUnits      = %d\n",
+				 i, ip->virtualUnits, ip->firstUnit,
+				 ip->lastUnit, ip->flags,
+				 ip->spareUnits);
+
+			if (ip->Reserved0 != ip->firstUnit) {
+				struct erase_info *instr = &inftl->instr;
+
+				/*
+				 * 	Most likely this is using the
+				 * 	undocumented qiuck mount feature.
+				 * 	We don't support that, we will need
+				 * 	to erase the hidden block for full
+				 * 	compatibility.
+				 */
+				instr->addr = ip->Reserved0 * inftl->EraseSize;
+				instr->len = inftl->EraseSize;
+				mtd_erase(mtd, instr);
+			}
+			if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
+				printk(KERN_WARNING "INFTL: Media Header "
+					"Partition %d sanity check failed\n"
+					"    firstUnit %d : lastUnit %d  >  "
+					"virtualUnits %d\n", i, ip->lastUnit,
+					ip->firstUnit, ip->Reserved0);
+				return -1;
+			}
+			if (ip->Reserved1 != 0) {
+				printk(KERN_WARNING "INFTL: Media Header "
+					"Partition %d sanity check failed: "
+					"Reserved1 %d != 0\n",
+					i, ip->Reserved1);
+				return -1;
+			}
+
+			if (ip->flags & INFTL_BDTL)
+				break;
+		}
+
+		if (i >= 4) {
+			printk(KERN_WARNING "INFTL: Media Header Partition "
+				"sanity check failed:\n       No partition "
+				"marked as Disk Partition\n");
+			return -1;
+		}
+
+		inftl->nb_boot_blocks = ip->firstUnit;
+		inftl->numvunits = ip->virtualUnits;
+		if (inftl->numvunits > (inftl->nb_blocks -
+		    inftl->nb_boot_blocks - 2)) {
+			printk(KERN_WARNING "INFTL: Media Header sanity check "
+				"failed:\n        numvunits (%d) > nb_blocks "
+				"(%d) - nb_boot_blocks(%d) - 2\n",
+				inftl->numvunits, inftl->nb_blocks,
+				inftl->nb_boot_blocks);
+			return -1;
+		}
+
+		inftl->mbd.size  = inftl->numvunits *
+			(inftl->EraseSize / SECTORSIZE);
+
+		/*
+		 * Block count is set to last used EUN (we won't need to keep
+		 * any meta-data past that point).
+		 */
+		inftl->firstEUN = ip->firstUnit;
+		inftl->lastEUN = ip->lastUnit;
+		inftl->nb_blocks = ip->lastUnit + 1;
+
+		/* Memory alloc */
+		inftl->PUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
+					       GFP_KERNEL);
+		if (!inftl->PUtable)
+			return -ENOMEM;
+
+		inftl->VUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
+					       GFP_KERNEL);
+		if (!inftl->VUtable) {
+			kfree(inftl->PUtable);
+			return -ENOMEM;
+		}
+
+		/* Mark the blocks before INFTL MediaHeader as reserved */
+		for (i = 0; i < inftl->nb_boot_blocks; i++)
+			inftl->PUtable[i] = BLOCK_RESERVED;
+		/* Mark all remaining blocks as potentially containing data */
+		for (; i < inftl->nb_blocks; i++)
+			inftl->PUtable[i] = BLOCK_NOTEXPLORED;
+
+		/* Mark this boot record (NFTL MediaHeader) block as reserved */
+		inftl->PUtable[block] = BLOCK_RESERVED;
+
+		/* Read Bad Erase Unit Table and modify PUtable[] accordingly */
+		for (i = 0; i < inftl->nb_blocks; i++) {
+			int physblock;
+			/* If any of the physical eraseblocks are bad, don't
+			   use the unit. */
+			for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
+				if (mtd_block_isbad(inftl->mbd.mtd,
+						    i * inftl->EraseSize + physblock))
+					inftl->PUtable[i] = BLOCK_RESERVED;
+			}
+		}
+
+		inftl->MediaUnit = block;
+		return 0;
+	}
+
+	/* Not found. */
+	return -1;
+}
+
+static int memcmpb(void *a, int c, int n)
+{
+	int i;
+	for (i = 0; i < n; i++) {
+		if (c != ((unsigned char *)a)[i])
+			return 1;
+	}
+	return 0;
+}
+
+/*
+ * check_free_sector: check if a free sector is actually FREE,
+ *	i.e. All 0xff in data and oob area.
+ */
+static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
+	int len, int check_oob)
+{
+	struct mtd_info *mtd = inftl->mbd.mtd;
+	size_t retlen;
+	int i, ret;
+	u8 *buf;
+
+	buf = kmalloc(SECTORSIZE + mtd->oobsize, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = -1;
+	for (i = 0; i < len; i += SECTORSIZE) {
+		if (mtd_read(mtd, address, SECTORSIZE, &retlen, buf))
+			goto out;
+		if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
+			goto out;
+
+		if (check_oob) {
+			if(inftl_read_oob(mtd, address, mtd->oobsize,
+					  &retlen, &buf[SECTORSIZE]) < 0)
+				goto out;
+			if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
+				goto out;
+		}
+		address += SECTORSIZE;
+	}
+
+	ret = 0;
+
+out:
+	kfree(buf);
+	return ret;
+}
+
+/*
+ * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
+ *		 Unit and Update INFTL metadata. Each erase operation is
+ *		 checked with check_free_sectors.
+ *
+ * Return: 0 when succeed, -1 on error.
+ *
+ * ToDo: 1. Is it necessary to check_free_sector after erasing ??
+ */
+int INFTL_formatblock(struct INFTLrecord *inftl, int block)
+{
+	size_t retlen;
+	struct inftl_unittail uci;
+	struct erase_info *instr = &inftl->instr;
+	struct mtd_info *mtd = inftl->mbd.mtd;
+	int physblock;
+
+	pr_debug("INFTL: INFTL_formatblock(inftl=%p,block=%d)\n", inftl, block);
+
+	memset(instr, 0, sizeof(struct erase_info));
+
+	/* FIXME: Shouldn't we be setting the 'discarded' flag to zero
+	   _first_? */
+
+	/* Use async erase interface, test return code */
+	instr->addr = block * inftl->EraseSize;
+	instr->len = inftl->mbd.mtd->erasesize;
+	/* Erase one physical eraseblock at a time, even though the NAND api
+	   allows us to group them.  This way we if we have a failure, we can
+	   mark only the failed block in the bbt. */
+	for (physblock = 0; physblock < inftl->EraseSize;
+	     physblock += instr->len, instr->addr += instr->len) {
+		int ret;
+
+		ret = mtd_erase(inftl->mbd.mtd, instr);
+		if (ret) {
+			printk(KERN_WARNING "INFTL: error while formatting block %d\n",
+				block);
+			goto fail;
+		}
+
+		/*
+		 * Check the "freeness" of Erase Unit before updating metadata.
+		 * FixMe: is this check really necessary? Since we have check
+		 * the return code after the erase operation.
+		 */
+		if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
+			goto fail;
+	}
+
+	uci.EraseMark = cpu_to_le16(ERASE_MARK);
+	uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
+	uci.Reserved[0] = 0;
+	uci.Reserved[1] = 0;
+	uci.Reserved[2] = 0;
+	uci.Reserved[3] = 0;
+	instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
+	if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
+		goto fail;
+	return 0;
+fail:
+	/* could not format, update the bad block table (caller is responsible
+	   for setting the PUtable to BLOCK_RESERVED on failure) */
+	mtd_block_markbad(inftl->mbd.mtd, instr->addr);
+	return -1;
+}
+
+/*
+ * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
+ *	Units in a Virtual Unit Chain, i.e. all the units are disconnected.
+ *
+ *	Since the chain is invalid then we will have to erase it from its
+ *	head (normally for INFTL we go from the oldest). But if it has a
+ *	loop then there is no oldest...
+ */
+static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
+{
+	unsigned int block = first_block, block1;
+
+	printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
+		first_block);
+
+	for (;;) {
+		block1 = inftl->PUtable[block];
+
+		printk(KERN_WARNING "INFTL: formatting block %d\n", block);
+		if (INFTL_formatblock(inftl, block) < 0) {
+			/*
+			 * Cannot format !!!! Mark it as Bad Unit,
+			 */
+			inftl->PUtable[block] = BLOCK_RESERVED;
+		} else {
+			inftl->PUtable[block] = BLOCK_FREE;
+		}
+
+		/* Goto next block on the chain */
+		block = block1;
+
+		if (block == BLOCK_NIL || block >= inftl->lastEUN)
+			break;
+	}
+}
+
+void INFTL_dumptables(struct INFTLrecord *s)
+{
+	int i;
+
+	pr_debug("-------------------------------------------"
+		"----------------------------------\n");
+
+	pr_debug("VUtable[%d] ->", s->nb_blocks);
+	for (i = 0; i < s->nb_blocks; i++) {
+		if ((i % 8) == 0)
+			pr_debug("\n%04x: ", i);
+		pr_debug("%04x ", s->VUtable[i]);
+	}
+
+	pr_debug("\n-------------------------------------------"
+		"----------------------------------\n");
+
+	pr_debug("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
+	for (i = 0; i <= s->lastEUN; i++) {
+		if ((i % 8) == 0)
+			pr_debug("\n%04x: ", i);
+		pr_debug("%04x ", s->PUtable[i]);
+	}
+
+	pr_debug("\n-------------------------------------------"
+		"----------------------------------\n");
+
+	pr_debug("INFTL ->\n"
+		"  EraseSize       = %d\n"
+		"  h/s/c           = %d/%d/%d\n"
+		"  numvunits       = %d\n"
+		"  firstEUN        = %d\n"
+		"  lastEUN         = %d\n"
+		"  numfreeEUNs     = %d\n"
+		"  LastFreeEUN     = %d\n"
+		"  nb_blocks       = %d\n"
+		"  nb_boot_blocks  = %d",
+		s->EraseSize, s->heads, s->sectors, s->cylinders,
+		s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
+		s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
+
+	pr_debug("\n-------------------------------------------"
+		"----------------------------------\n");
+}
+
+void INFTL_dumpVUchains(struct INFTLrecord *s)
+{
+	int logical, block, i;
+
+	pr_debug("-------------------------------------------"
+		"----------------------------------\n");
+
+	pr_debug("INFTL Virtual Unit Chains:\n");
+	for (logical = 0; logical < s->nb_blocks; logical++) {
+		block = s->VUtable[logical];
+		if (block >= s->nb_blocks)
+			continue;
+		pr_debug("  LOGICAL %d --> %d ", logical, block);
+		for (i = 0; i < s->nb_blocks; i++) {
+			if (s->PUtable[block] == BLOCK_NIL)
+				break;
+			block = s->PUtable[block];
+			pr_debug("%d ", block);
+		}
+		pr_debug("\n");
+	}
+
+	pr_debug("-------------------------------------------"
+		"----------------------------------\n");
+}
+
+int INFTL_mount(struct INFTLrecord *s)
+{
+	struct mtd_info *mtd = s->mbd.mtd;
+	unsigned int block, first_block, prev_block, last_block;
+	unsigned int first_logical_block, logical_block, erase_mark;
+	int chain_length, do_format_chain;
+	struct inftl_unithead1 h0;
+	struct inftl_unittail h1;
+	size_t retlen;
+	int i;
+	u8 *ANACtable, ANAC;
+
+	pr_debug("INFTL: INFTL_mount(inftl=%p)\n", s);
+
+	/* Search for INFTL MediaHeader and Spare INFTL Media Header */
+	if (find_boot_record(s) < 0) {
+		printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
+		return -ENXIO;
+	}
+
+	/* Init the logical to physical table */
+	for (i = 0; i < s->nb_blocks; i++)
+		s->VUtable[i] = BLOCK_NIL;
+
+	logical_block = block = BLOCK_NIL;
+
+	/* Temporary buffer to store ANAC numbers. */
+	ANACtable = kcalloc(s->nb_blocks, sizeof(u8), GFP_KERNEL);
+	if (!ANACtable)
+		return -ENOMEM;
+
+	/*
+	 * First pass is to explore each physical unit, and construct the
+	 * virtual chains that exist (newest physical unit goes into VUtable).
+	 * Any block that is in any way invalid will be left in the
+	 * NOTEXPLORED state. Then at the end we will try to format it and
+	 * mark it as free.
+	 */
+	pr_debug("INFTL: pass 1, explore each unit\n");
+	for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
+		if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
+			continue;
+
+		do_format_chain = 0;
+		first_logical_block = BLOCK_NIL;
+		last_block = BLOCK_NIL;
+		block = first_block;
+
+		for (chain_length = 0; ; chain_length++) {
+
+			if ((chain_length == 0) &&
+			    (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
+				/* Nothing to do here, onto next block */
+				break;
+			}
+
+			if (inftl_read_oob(mtd, block * s->EraseSize + 8,
+					   8, &retlen, (char *)&h0) < 0 ||
+			    inftl_read_oob(mtd, block * s->EraseSize +
+					   2 * SECTORSIZE + 8, 8, &retlen,
+					   (char *)&h1) < 0) {
+				/* Should never happen? */
+				do_format_chain++;
+				break;
+			}
+
+			logical_block = le16_to_cpu(h0.virtualUnitNo);
+			prev_block = le16_to_cpu(h0.prevUnitNo);
+			erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
+			ANACtable[block] = h0.ANAC;
+
+			/* Previous block is relative to start of Partition */
+			if (prev_block < s->nb_blocks)
+				prev_block += s->firstEUN;
+
+			/* Already explored partial chain? */
+			if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
+				/* Check if chain for this logical */
+				if (logical_block == first_logical_block) {
+					if (last_block != BLOCK_NIL)
+						s->PUtable[last_block] = block;
+				}
+				break;
+			}
+
+			/* Check for invalid block */
+			if (erase_mark != ERASE_MARK) {
+				printk(KERN_WARNING "INFTL: corrupt block %d "
+					"in chain %d, chain length %d, erase "
+					"mark 0x%x?\n", block, first_block,
+					chain_length, erase_mark);
+				/*
+				 * Assume end of chain, probably incomplete
+				 * fold/erase...
+				 */
+				if (chain_length == 0)
+					do_format_chain++;
+				break;
+			}
+
+			/* Check for it being free already then... */
+			if ((logical_block == BLOCK_FREE) ||
+			    (logical_block == BLOCK_NIL)) {
+				s->PUtable[block] = BLOCK_FREE;
+				break;
+			}
+
+			/* Sanity checks on block numbers */
+			if ((logical_block >= s->nb_blocks) ||
+			    ((prev_block >= s->nb_blocks) &&
+			     (prev_block != BLOCK_NIL))) {
+				if (chain_length > 0) {
+					printk(KERN_WARNING "INFTL: corrupt "
+						"block %d in chain %d?\n",
+						block, first_block);
+					do_format_chain++;
+				}
+				break;
+			}
+
+			if (first_logical_block == BLOCK_NIL) {
+				first_logical_block = logical_block;
+			} else {
+				if (first_logical_block != logical_block) {
+					/* Normal for folded chain... */
+					break;
+				}
+			}
+
+			/*
+			 * Current block is valid, so if we followed a virtual
+			 * chain to get here then we can set the previous
+			 * block pointer in our PUtable now. Then move onto
+			 * the previous block in the chain.
+			 */
+			s->PUtable[block] = BLOCK_NIL;
+			if (last_block != BLOCK_NIL)
+				s->PUtable[last_block] = block;
+			last_block = block;
+			block = prev_block;
+
+			/* Check for end of chain */
+			if (block == BLOCK_NIL)
+				break;
+
+			/* Validate next block before following it... */
+			if (block > s->lastEUN) {
+				printk(KERN_WARNING "INFTL: invalid previous "
+					"block %d in chain %d?\n", block,
+					first_block);
+				do_format_chain++;
+				break;
+			}
+		}
+
+		if (do_format_chain) {
+			format_chain(s, first_block);
+			continue;
+		}
+
+		/*
+		 * Looks like a valid chain then. It may not really be the
+		 * newest block in the chain, but it is the newest we have
+		 * found so far. We might update it in later iterations of
+		 * this loop if we find something newer.
+		 */
+		s->VUtable[first_logical_block] = first_block;
+		logical_block = BLOCK_NIL;
+	}
+
+	INFTL_dumptables(s);
+
+	/*
+	 * Second pass, check for infinite loops in chains. These are
+	 * possible because we don't update the previous pointers when
+	 * we fold chains. No big deal, just fix them up in PUtable.
+	 */
+	pr_debug("INFTL: pass 2, validate virtual chains\n");
+	for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
+		block = s->VUtable[logical_block];
+		last_block = BLOCK_NIL;
+
+		/* Check for free/reserved/nil */
+		if (block >= BLOCK_RESERVED)
+			continue;
+
+		ANAC = ANACtable[block];
+		for (i = 0; i < s->numvunits; i++) {
+			if (s->PUtable[block] == BLOCK_NIL)
+				break;
+			if (s->PUtable[block] > s->lastEUN) {
+				printk(KERN_WARNING "INFTL: invalid prev %d, "
+					"in virtual chain %d\n",
+					s->PUtable[block], logical_block);
+				s->PUtable[block] = BLOCK_NIL;
+
+			}
+			if (ANACtable[block] != ANAC) {
+				/*
+				 * Chain must point back to itself. This is ok,
+				 * but we will need adjust the tables with this
+				 * newest block and oldest block.
+				 */
+				s->VUtable[logical_block] = block;
+				s->PUtable[last_block] = BLOCK_NIL;
+				break;
+			}
+
+			ANAC--;
+			last_block = block;
+			block = s->PUtable[block];
+		}
+
+		if (i >= s->nb_blocks) {
+			/*
+			 * Uhoo, infinite chain with valid ANACS!
+			 * Format whole chain...
+			 */
+			format_chain(s, first_block);
+		}
+	}
+
+	INFTL_dumptables(s);
+	INFTL_dumpVUchains(s);
+
+	/*
+	 * Third pass, format unreferenced blocks and init free block count.
+	 */
+	s->numfreeEUNs = 0;
+	s->LastFreeEUN = BLOCK_NIL;
+
+	pr_debug("INFTL: pass 3, format unused blocks\n");
+	for (block = s->firstEUN; block <= s->lastEUN; block++) {
+		if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
+			printk("INFTL: unreferenced block %d, formatting it\n",
+				block);
+			if (INFTL_formatblock(s, block) < 0)
+				s->PUtable[block] = BLOCK_RESERVED;
+			else
+				s->PUtable[block] = BLOCK_FREE;
+		}
+		if (s->PUtable[block] == BLOCK_FREE) {
+			s->numfreeEUNs++;
+			if (s->LastFreeEUN == BLOCK_NIL)
+				s->LastFreeEUN = block;
+		}
+	}
+
+	kfree(ANACtable);
+	return 0;
+}