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, 455 insertions, 0 deletions

diff --git a/drivers/mtd/ssfdc.c b/drivers/mtd/ssfdc.c
new file mode 100644
index 000000000..04da685c3
--- /dev/null
+++ b/drivers/mtd/ssfdc.c
@@ -0,0 +1,455 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Linux driver for SSFDC Flash Translation Layer (Read only)
+ * © 2005 Eptar srl
+ * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
+ *
+ * Based on NTFL and MTDBLOCK_RO drivers
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/hdreg.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/blktrans.h>
+
+struct ssfdcr_record {
+	struct mtd_blktrans_dev mbd;
+	int usecount;
+	unsigned char heads;
+	unsigned char sectors;
+	unsigned short cylinders;
+	int cis_block;			/* block n. containing CIS/IDI */
+	int erase_size;			/* phys_block_size */
+	unsigned short *logic_block_map; /* all zones (max 8192 phys blocks on
+					    the 128MiB) */
+	int map_len;			/* n. phys_blocks on the card */
+};
+
+#define SSFDCR_MAJOR		257
+#define SSFDCR_PARTN_BITS	3
+
+#define SECTOR_SIZE		512
+#define SECTOR_SHIFT		9
+#define OOB_SIZE		16
+
+#define MAX_LOGIC_BLK_PER_ZONE	1000
+#define MAX_PHYS_BLK_PER_ZONE	1024
+
+#define KiB(x)	( (x) * 1024L )
+#define MiB(x)	( KiB(x) * 1024L )
+
+/** CHS Table
+		1MiB	2MiB	4MiB	8MiB	16MiB	32MiB	64MiB	128MiB
+NCylinder	125	125	250	250	500	500	500	500
+NHead		4	4	4	4	4	8	8	16
+NSector		4	8	8	16	16	16	32	32
+SumSector	2,000	4,000	8,000	16,000	32,000	64,000	128,000	256,000
+SectorSize	512	512	512	512	512	512	512	512
+**/
+
+typedef struct {
+	unsigned long size;
+	unsigned short cyl;
+	unsigned char head;
+	unsigned char sec;
+} chs_entry_t;
+
+/* Must be ordered by size */
+static const chs_entry_t chs_table[] = {
+	{ MiB(  1), 125,  4,  4 },
+	{ MiB(  2), 125,  4,  8 },
+	{ MiB(  4), 250,  4,  8 },
+	{ MiB(  8), 250,  4, 16 },
+	{ MiB( 16), 500,  4, 16 },
+	{ MiB( 32), 500,  8, 16 },
+	{ MiB( 64), 500,  8, 32 },
+	{ MiB(128), 500, 16, 32 },
+	{ 0 },
+};
+
+static int get_chs(unsigned long size, unsigned short *cyl, unsigned char *head,
+			unsigned char *sec)
+{
+	int k;
+	int found = 0;
+
+	k = 0;
+	while (chs_table[k].size > 0 && size > chs_table[k].size)
+		k++;
+
+	if (chs_table[k].size > 0) {
+		if (cyl)
+			*cyl = chs_table[k].cyl;
+		if (head)
+			*head = chs_table[k].head;
+		if (sec)
+			*sec = chs_table[k].sec;
+		found = 1;
+	}
+
+	return found;
+}
+
+/* These bytes are the signature for the CIS/IDI sector */
+static const uint8_t cis_numbers[] = {
+	0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
+};
+
+/* Read and check for a valid CIS sector */
+static int get_valid_cis_sector(struct mtd_info *mtd)
+{
+	int ret, k, cis_sector;
+	size_t retlen;
+	loff_t offset;
+	uint8_t *sect_buf;
+
+	cis_sector = -1;
+
+	sect_buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
+	if (!sect_buf)
+		goto out;
+
+	/*
+	 * Look for CIS/IDI sector on the first GOOD block (give up after 4 bad
+	 * blocks). If the first good block doesn't contain CIS number the flash
+	 * is not SSFDC formatted
+	 */
+	for (k = 0, offset = 0; k < 4; k++, offset += mtd->erasesize) {
+		if (mtd_block_isbad(mtd, offset)) {
+			ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen,
+				       sect_buf);
+
+			/* CIS pattern match on the sector buffer */
+			if (ret < 0 || retlen != SECTOR_SIZE) {
+				printk(KERN_WARNING
+					"SSFDC_RO:can't read CIS/IDI sector\n");
+			} else if (!memcmp(sect_buf, cis_numbers,
+					sizeof(cis_numbers))) {
+				/* Found */
+				cis_sector = (int)(offset >> SECTOR_SHIFT);
+			} else {
+				pr_debug("SSFDC_RO: CIS/IDI sector not found"
+					" on %s (mtd%d)\n", mtd->name,
+					mtd->index);
+			}
+			break;
+		}
+	}
+
+	kfree(sect_buf);
+ out:
+	return cis_sector;
+}
+
+/* Read physical sector (wrapper to MTD_READ) */
+static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf,
+				int sect_no)
+{
+	int ret;
+	size_t retlen;
+	loff_t offset = (loff_t)sect_no << SECTOR_SHIFT;
+
+	ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, sect_buf);
+	if (ret < 0 || retlen != SECTOR_SIZE)
+		return -1;
+
+	return 0;
+}
+
+/* Read redundancy area (wrapper to MTD_READ_OOB */
+static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
+{
+	struct mtd_oob_ops ops = { };
+	int ret;
+
+	ops.mode = MTD_OPS_RAW;
+	ops.ooboffs = 0;
+	ops.ooblen = OOB_SIZE;
+	ops.oobbuf = buf;
+	ops.datbuf = NULL;
+
+	ret = mtd_read_oob(mtd, offs, &ops);
+	if (ret < 0 || ops.oobretlen != OOB_SIZE)
+		return -1;
+
+	return 0;
+}
+
+/* Parity calculator on a word of n bit size */
+static int get_parity(int number, int size)
+{
+ 	int k;
+	int parity;
+
+	parity = 1;
+	for (k = 0; k < size; k++) {
+		parity += (number >> k);
+		parity &= 1;
+	}
+	return parity;
+}
+
+/* Read and validate the logical block address field stored in the OOB */
+static int get_logical_address(uint8_t *oob_buf)
+{
+	int block_address, parity;
+	int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */
+	int j;
+	int ok = 0;
+
+	/*
+	 * Look for the first valid logical address
+	 * Valid address has fixed pattern on most significant bits and
+	 * parity check
+	 */
+	for (j = 0; j < ARRAY_SIZE(offset); j++) {
+		block_address = ((int)oob_buf[offset[j]] << 8) |
+			oob_buf[offset[j]+1];
+
+		/* Check for the signature bits in the address field (MSBits) */
+		if ((block_address & ~0x7FF) == 0x1000) {
+			parity = block_address & 0x01;
+			block_address &= 0x7FF;
+			block_address >>= 1;
+
+			if (get_parity(block_address, 10) != parity) {
+				pr_debug("SSFDC_RO: logical address field%d"
+					"parity error(0x%04X)\n", j+1,
+					block_address);
+			} else {
+				ok = 1;
+				break;
+			}
+		}
+	}
+
+	if (!ok)
+		block_address = -2;
+
+	pr_debug("SSFDC_RO: get_logical_address() %d\n",
+		block_address);
+
+	return block_address;
+}
+
+/* Build the logic block map */
+static int build_logical_block_map(struct ssfdcr_record *ssfdc)
+{
+	unsigned long offset;
+	uint8_t oob_buf[OOB_SIZE];
+	int ret, block_address, phys_block;
+	struct mtd_info *mtd = ssfdc->mbd.mtd;
+
+	pr_debug("SSFDC_RO: build_block_map() nblks=%d (%luK)\n",
+	      ssfdc->map_len,
+	      (unsigned long)ssfdc->map_len * ssfdc->erase_size / 1024);
+
+	/* Scan every physical block, skip CIS block */
+	for (phys_block = ssfdc->cis_block + 1; phys_block < ssfdc->map_len;
+			phys_block++) {
+		offset = (unsigned long)phys_block * ssfdc->erase_size;
+		if (mtd_block_isbad(mtd, offset))
+			continue;	/* skip bad blocks */
+
+		ret = read_raw_oob(mtd, offset, oob_buf);
+		if (ret < 0) {
+			pr_debug("SSFDC_RO: mtd read_oob() failed at %lu\n",
+				offset);
+			return -1;
+		}
+		block_address = get_logical_address(oob_buf);
+
+		/* Skip invalid addresses */
+		if (block_address >= 0 &&
+				block_address < MAX_LOGIC_BLK_PER_ZONE) {
+			int zone_index;
+
+			zone_index = phys_block / MAX_PHYS_BLK_PER_ZONE;
+			block_address += zone_index * MAX_LOGIC_BLK_PER_ZONE;
+			ssfdc->logic_block_map[block_address] =
+				(unsigned short)phys_block;
+
+			pr_debug("SSFDC_RO: build_block_map() phys_block=%d,"
+				"logic_block_addr=%d, zone=%d\n",
+				phys_block, block_address, zone_index);
+		}
+	}
+	return 0;
+}
+
+static void ssfdcr_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
+{
+	struct ssfdcr_record *ssfdc;
+	int cis_sector;
+
+	/* Check for small page NAND flash */
+	if (!mtd_type_is_nand(mtd) || mtd->oobsize != OOB_SIZE ||
+	    mtd->size > UINT_MAX)
+		return;
+
+	/* Check for SSDFC format by reading CIS/IDI sector */
+	cis_sector = get_valid_cis_sector(mtd);
+	if (cis_sector == -1)
+		return;
+
+	ssfdc = kzalloc(sizeof(struct ssfdcr_record), GFP_KERNEL);
+	if (!ssfdc)
+		return;
+
+	ssfdc->mbd.mtd = mtd;
+	ssfdc->mbd.devnum = -1;
+	ssfdc->mbd.tr = tr;
+	ssfdc->mbd.readonly = 1;
+
+	ssfdc->cis_block = cis_sector / (mtd->erasesize >> SECTOR_SHIFT);
+	ssfdc->erase_size = mtd->erasesize;
+	ssfdc->map_len = (u32)mtd->size / mtd->erasesize;
+
+	pr_debug("SSFDC_RO: cis_block=%d,erase_size=%d,map_len=%d,n_zones=%d\n",
+		ssfdc->cis_block, ssfdc->erase_size, ssfdc->map_len,
+		DIV_ROUND_UP(ssfdc->map_len, MAX_PHYS_BLK_PER_ZONE));
+
+	/* Set geometry */
+	ssfdc->heads = 16;
+	ssfdc->sectors = 32;
+	get_chs(mtd->size, NULL, &ssfdc->heads, &ssfdc->sectors);
+	ssfdc->cylinders = (unsigned short)(((u32)mtd->size >> SECTOR_SHIFT) /
+			((long)ssfdc->sectors * (long)ssfdc->heads));
+
+	pr_debug("SSFDC_RO: using C:%d H:%d S:%d == %ld sects\n",
+		ssfdc->cylinders, ssfdc->heads , ssfdc->sectors,
+		(long)ssfdc->cylinders * (long)ssfdc->heads *
+		(long)ssfdc->sectors);
+
+	ssfdc->mbd.size = (long)ssfdc->heads * (long)ssfdc->cylinders *
+				(long)ssfdc->sectors;
+
+	/* Allocate logical block map */
+	ssfdc->logic_block_map =
+		kmalloc_array(ssfdc->map_len,
+			      sizeof(ssfdc->logic_block_map[0]), GFP_KERNEL);
+	if (!ssfdc->logic_block_map)
+		goto out_err;
+	memset(ssfdc->logic_block_map, 0xff, sizeof(ssfdc->logic_block_map[0]) *
+		ssfdc->map_len);
+
+	/* Build logical block map */
+	if (build_logical_block_map(ssfdc) < 0)
+		goto out_err;
+
+	/* Register device + partitions */
+	if (add_mtd_blktrans_dev(&ssfdc->mbd))
+		goto out_err;
+
+	printk(KERN_INFO "SSFDC_RO: Found ssfdc%c on mtd%d (%s)\n",
+		ssfdc->mbd.devnum + 'a', mtd->index, mtd->name);
+	return;
+
+out_err:
+	kfree(ssfdc->logic_block_map);
+        kfree(ssfdc);
+}
+
+static void ssfdcr_remove_dev(struct mtd_blktrans_dev *dev)
+{
+	struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
+
+	pr_debug("SSFDC_RO: remove_dev (i=%d)\n", dev->devnum);
+
+	del_mtd_blktrans_dev(dev);
+	kfree(ssfdc->logic_block_map);
+}
+
+static int ssfdcr_readsect(struct mtd_blktrans_dev *dev,
+				unsigned long logic_sect_no, char *buf)
+{
+	struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
+	int sectors_per_block, offset, block_address;
+
+	sectors_per_block = ssfdc->erase_size >> SECTOR_SHIFT;
+	offset = (int)(logic_sect_no % sectors_per_block);
+	block_address = (int)(logic_sect_no / sectors_per_block);
+
+	pr_debug("SSFDC_RO: ssfdcr_readsect(%lu) sec_per_blk=%d, ofst=%d,"
+		" block_addr=%d\n", logic_sect_no, sectors_per_block, offset,
+		block_address);
+
+	BUG_ON(block_address >= ssfdc->map_len);
+
+	block_address = ssfdc->logic_block_map[block_address];
+
+	pr_debug("SSFDC_RO: ssfdcr_readsect() phys_block_addr=%d\n",
+		block_address);
+
+	if (block_address < 0xffff) {
+		unsigned long sect_no;
+
+		sect_no = (unsigned long)block_address * sectors_per_block +
+				offset;
+
+		pr_debug("SSFDC_RO: ssfdcr_readsect() phys_sect_no=%lu\n",
+			sect_no);
+
+		if (read_physical_sector(ssfdc->mbd.mtd, buf, sect_no) < 0)
+			return -EIO;
+	} else {
+		memset(buf, 0xff, SECTOR_SIZE);
+	}
+
+	return 0;
+}
+
+static int ssfdcr_getgeo(struct mtd_blktrans_dev *dev,  struct hd_geometry *geo)
+{
+	struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
+
+	pr_debug("SSFDC_RO: ssfdcr_getgeo() C=%d, H=%d, S=%d\n",
+			ssfdc->cylinders, ssfdc->heads, ssfdc->sectors);
+
+	geo->heads = ssfdc->heads;
+	geo->sectors = ssfdc->sectors;
+	geo->cylinders = ssfdc->cylinders;
+
+	return 0;
+}
+
+/****************************************************************************
+ *
+ * Module stuff
+ *
+ ****************************************************************************/
+
+static struct mtd_blktrans_ops ssfdcr_tr = {
+	.name		= "ssfdc",
+	.major		= SSFDCR_MAJOR,
+	.part_bits	= SSFDCR_PARTN_BITS,
+	.blksize	= SECTOR_SIZE,
+	.getgeo		= ssfdcr_getgeo,
+	.readsect	= ssfdcr_readsect,
+	.add_mtd	= ssfdcr_add_mtd,
+	.remove_dev	= ssfdcr_remove_dev,
+	.owner		= THIS_MODULE,
+};
+
+static int __init init_ssfdcr(void)
+{
+	printk(KERN_INFO "SSFDC read-only Flash Translation layer\n");
+
+	return register_mtd_blktrans(&ssfdcr_tr);
+}
+
+static void __exit cleanup_ssfdcr(void)
+{
+	deregister_mtd_blktrans(&ssfdcr_tr);
+}
+
+module_init(init_ssfdcr);
+module_exit(cleanup_ssfdcr);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>");
+MODULE_DESCRIPTION("Flash Translation Layer for read-only SSFDC SmartMedia card");