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, 983 insertions, 0 deletions

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
new file mode 100644
index 000000000..62abebbaf
--- /dev/null
+++ b/drivers/scsi/sd_zbc.c
@@ -0,0 +1,983 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SCSI Zoned Block commands
+ *
+ * Copyright (C) 2014-2015 SUSE Linux GmbH
+ * Written by: Hannes Reinecke <hare@suse.de>
+ * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
+ * Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
+ */
+
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <linux/sched/mm.h>
+#include <linux/mutex.h>
+
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include "sd.h"
+
+#define CREATE_TRACE_POINTS
+#include "sd_trace.h"
+
+/**
+ * sd_zbc_get_zone_wp_offset - Get zone write pointer offset.
+ * @zone: Zone for which to return the write pointer offset.
+ *
+ * Return: offset of the write pointer from the start of the zone.
+ */
+static unsigned int sd_zbc_get_zone_wp_offset(struct blk_zone *zone)
+{
+	if (zone->type == ZBC_ZONE_TYPE_CONV)
+		return 0;
+
+	switch (zone->cond) {
+	case BLK_ZONE_COND_IMP_OPEN:
+	case BLK_ZONE_COND_EXP_OPEN:
+	case BLK_ZONE_COND_CLOSED:
+		return zone->wp - zone->start;
+	case BLK_ZONE_COND_FULL:
+		return zone->len;
+	case BLK_ZONE_COND_EMPTY:
+	case BLK_ZONE_COND_OFFLINE:
+	case BLK_ZONE_COND_READONLY:
+	default:
+		/*
+		 * Offline and read-only zones do not have a valid
+		 * write pointer. Use 0 as for an empty zone.
+		 */
+		return 0;
+	}
+}
+
+/* Whether or not a SCSI zone descriptor describes a gap zone. */
+static bool sd_zbc_is_gap_zone(const u8 buf[64])
+{
+	return (buf[0] & 0xf) == ZBC_ZONE_TYPE_GAP;
+}
+
+/**
+ * sd_zbc_parse_report - Parse a SCSI zone descriptor
+ * @sdkp: SCSI disk pointer.
+ * @buf: SCSI zone descriptor.
+ * @idx: Index of the zone relative to the first zone reported by the current
+ *	sd_zbc_report_zones() call.
+ * @cb: Callback function pointer.
+ * @data: Second argument passed to @cb.
+ *
+ * Return: Value returned by @cb.
+ *
+ * Convert a SCSI zone descriptor into struct blk_zone format. Additionally,
+ * call @cb(blk_zone, @data).
+ */
+static int sd_zbc_parse_report(struct scsi_disk *sdkp, const u8 buf[64],
+			       unsigned int idx, report_zones_cb cb, void *data)
+{
+	struct scsi_device *sdp = sdkp->device;
+	struct blk_zone zone = { 0 };
+	sector_t start_lba, gran;
+	int ret;
+
+	if (WARN_ON_ONCE(sd_zbc_is_gap_zone(buf)))
+		return -EINVAL;
+
+	zone.type = buf[0] & 0x0f;
+	zone.cond = (buf[1] >> 4) & 0xf;
+	if (buf[1] & 0x01)
+		zone.reset = 1;
+	if (buf[1] & 0x02)
+		zone.non_seq = 1;
+
+	start_lba = get_unaligned_be64(&buf[16]);
+	zone.start = logical_to_sectors(sdp, start_lba);
+	zone.capacity = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
+	zone.len = zone.capacity;
+	if (sdkp->zone_starting_lba_gran) {
+		gran = logical_to_sectors(sdp, sdkp->zone_starting_lba_gran);
+		if (zone.len > gran) {
+			sd_printk(KERN_ERR, sdkp,
+				  "Invalid zone at LBA %llu with capacity %llu and length %llu; granularity = %llu\n",
+				  start_lba,
+				  sectors_to_logical(sdp, zone.capacity),
+				  sectors_to_logical(sdp, zone.len),
+				  sectors_to_logical(sdp, gran));
+			return -EINVAL;
+		}
+		/*
+		 * Use the starting LBA granularity instead of the zone length
+		 * obtained from the REPORT ZONES command.
+		 */
+		zone.len = gran;
+	}
+	if (zone.cond == ZBC_ZONE_COND_FULL)
+		zone.wp = zone.start + zone.len;
+	else
+		zone.wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
+
+	ret = cb(&zone, idx, data);
+	if (ret)
+		return ret;
+
+	if (sdkp->rev_wp_offset)
+		sdkp->rev_wp_offset[idx] = sd_zbc_get_zone_wp_offset(&zone);
+
+	return 0;
+}
+
+/**
+ * sd_zbc_do_report_zones - Issue a REPORT ZONES scsi command.
+ * @sdkp: The target disk
+ * @buf: vmalloc-ed buffer to use for the reply
+ * @buflen: the buffer size
+ * @lba: Start LBA of the report
+ * @partial: Do partial report
+ *
+ * For internal use during device validation.
+ * Using partial=true can significantly speed up execution of a report zones
+ * command because the disk does not have to count all possible report matching
+ * zones and will only report the count of zones fitting in the command reply
+ * buffer.
+ */
+static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
+				  unsigned int buflen, sector_t lba,
+				  bool partial)
+{
+	struct scsi_device *sdp = sdkp->device;
+	const int timeout = sdp->request_queue->rq_timeout;
+	struct scsi_sense_hdr sshdr;
+	unsigned char cmd[16];
+	unsigned int rep_len;
+	int result;
+
+	memset(cmd, 0, 16);
+	cmd[0] = ZBC_IN;
+	cmd[1] = ZI_REPORT_ZONES;
+	put_unaligned_be64(lba, &cmd[2]);
+	put_unaligned_be32(buflen, &cmd[10]);
+	if (partial)
+		cmd[14] = ZBC_REPORT_ZONE_PARTIAL;
+
+	result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+				  buf, buflen, &sshdr,
+				  timeout, SD_MAX_RETRIES, NULL);
+	if (result) {
+		sd_printk(KERN_ERR, sdkp,
+			  "REPORT ZONES start lba %llu failed\n", lba);
+		sd_print_result(sdkp, "REPORT ZONES", result);
+		if (result > 0 && scsi_sense_valid(&sshdr))
+			sd_print_sense_hdr(sdkp, &sshdr);
+		return -EIO;
+	}
+
+	rep_len = get_unaligned_be32(&buf[0]);
+	if (rep_len < 64) {
+		sd_printk(KERN_ERR, sdkp,
+			  "REPORT ZONES report invalid length %u\n",
+			  rep_len);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * sd_zbc_alloc_report_buffer() - Allocate a buffer for report zones reply.
+ * @sdkp: The target disk
+ * @nr_zones: Maximum number of zones to report
+ * @buflen: Size of the buffer allocated
+ *
+ * Try to allocate a reply buffer for the number of requested zones.
+ * The size of the buffer allocated may be smaller than requested to
+ * satify the device constraint (max_hw_sectors, max_segments, etc).
+ *
+ * Return the address of the allocated buffer and update @buflen with
+ * the size of the allocated buffer.
+ */
+static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
+					unsigned int nr_zones, size_t *buflen)
+{
+	struct request_queue *q = sdkp->disk->queue;
+	size_t bufsize;
+	void *buf;
+
+	/*
+	 * Report zone buffer size should be at most 64B times the number of
+	 * zones requested plus the 64B reply header, but should be aligned
+	 * to SECTOR_SIZE for ATA devices.
+	 * Make sure that this size does not exceed the hardware capabilities.
+	 * Furthermore, since the report zone command cannot be split, make
+	 * sure that the allocated buffer can always be mapped by limiting the
+	 * number of pages allocated to the HBA max segments limit.
+	 */
+	nr_zones = min(nr_zones, sdkp->zone_info.nr_zones);
+	bufsize = roundup((nr_zones + 1) * 64, SECTOR_SIZE);
+	bufsize = min_t(size_t, bufsize,
+			queue_max_hw_sectors(q) << SECTOR_SHIFT);
+	bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
+
+	while (bufsize >= SECTOR_SIZE) {
+		buf = __vmalloc(bufsize,
+				GFP_KERNEL | __GFP_ZERO | __GFP_NORETRY);
+		if (buf) {
+			*buflen = bufsize;
+			return buf;
+		}
+		bufsize = rounddown(bufsize >> 1, SECTOR_SIZE);
+	}
+
+	return NULL;
+}
+
+/**
+ * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
+ * @sdkp: The target disk
+ */
+static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
+{
+	return logical_to_sectors(sdkp->device, sdkp->zone_info.zone_blocks);
+}
+
+/**
+ * sd_zbc_report_zones - SCSI .report_zones() callback.
+ * @disk: Disk to report zones for.
+ * @sector: Start sector.
+ * @nr_zones: Maximum number of zones to report.
+ * @cb: Callback function called to report zone information.
+ * @data: Second argument passed to @cb.
+ *
+ * Called by the block layer to iterate over zone information. See also the
+ * disk->fops->report_zones() calls in block/blk-zoned.c.
+ */
+int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
+			unsigned int nr_zones, report_zones_cb cb, void *data)
+{
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	sector_t lba = sectors_to_logical(sdkp->device, sector);
+	unsigned int nr, i;
+	unsigned char *buf;
+	u64 zone_length, start_lba;
+	size_t offset, buflen = 0;
+	int zone_idx = 0;
+	int ret;
+
+	if (!sd_is_zoned(sdkp))
+		/* Not a zoned device */
+		return -EOPNOTSUPP;
+
+	if (!sdkp->capacity)
+		/* Device gone or invalid */
+		return -ENODEV;
+
+	buf = sd_zbc_alloc_report_buffer(sdkp, nr_zones, &buflen);
+	if (!buf)
+		return -ENOMEM;
+
+	while (zone_idx < nr_zones && lba < sdkp->capacity) {
+		ret = sd_zbc_do_report_zones(sdkp, buf, buflen, lba, true);
+		if (ret)
+			goto out;
+
+		offset = 0;
+		nr = min(nr_zones, get_unaligned_be32(&buf[0]) / 64);
+		if (!nr)
+			break;
+
+		for (i = 0; i < nr && zone_idx < nr_zones; i++) {
+			offset += 64;
+			start_lba = get_unaligned_be64(&buf[offset + 16]);
+			zone_length = get_unaligned_be64(&buf[offset + 8]);
+			if ((zone_idx == 0 &&
+			    (lba < start_lba ||
+			     lba >= start_lba + zone_length)) ||
+			    (zone_idx > 0 && start_lba != lba) ||
+			    start_lba + zone_length < start_lba) {
+				sd_printk(KERN_ERR, sdkp,
+					  "Zone %d at LBA %llu is invalid: %llu + %llu\n",
+					  zone_idx, lba, start_lba, zone_length);
+				ret = -EINVAL;
+				goto out;
+			}
+			lba = start_lba + zone_length;
+			if (sd_zbc_is_gap_zone(&buf[offset])) {
+				if (sdkp->zone_starting_lba_gran)
+					continue;
+				sd_printk(KERN_ERR, sdkp,
+					  "Gap zone without constant LBA offsets\n");
+				ret = -EINVAL;
+				goto out;
+			}
+
+			ret = sd_zbc_parse_report(sdkp, buf + offset, zone_idx,
+						  cb, data);
+			if (ret)
+				goto out;
+
+			zone_idx++;
+		}
+	}
+
+	ret = zone_idx;
+out:
+	kvfree(buf);
+	return ret;
+}
+
+static blk_status_t sd_zbc_cmnd_checks(struct scsi_cmnd *cmd)
+{
+	struct request *rq = scsi_cmd_to_rq(cmd);
+	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
+	sector_t sector = blk_rq_pos(rq);
+
+	if (!sd_is_zoned(sdkp))
+		/* Not a zoned device */
+		return BLK_STS_IOERR;
+
+	if (sdkp->device->changed)
+		return BLK_STS_IOERR;
+
+	if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
+		/* Unaligned request */
+		return BLK_STS_IOERR;
+
+	return BLK_STS_OK;
+}
+
+#define SD_ZBC_INVALID_WP_OFST	(~0u)
+#define SD_ZBC_UPDATING_WP_OFST	(SD_ZBC_INVALID_WP_OFST - 1)
+
+static int sd_zbc_update_wp_offset_cb(struct blk_zone *zone, unsigned int idx,
+				    void *data)
+{
+	struct scsi_disk *sdkp = data;
+
+	lockdep_assert_held(&sdkp->zones_wp_offset_lock);
+
+	sdkp->zones_wp_offset[idx] = sd_zbc_get_zone_wp_offset(zone);
+
+	return 0;
+}
+
+/*
+ * An attempt to append a zone triggered an invalid write pointer error.
+ * Reread the write pointer of the zone(s) in which the append failed.
+ */
+static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
+{
+	struct scsi_disk *sdkp;
+	unsigned long flags;
+	sector_t zno;
+	int ret;
+
+	sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
+
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
+	for (zno = 0; zno < sdkp->zone_info.nr_zones; zno++) {
+		if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
+			continue;
+
+		spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
+		ret = sd_zbc_do_report_zones(sdkp, sdkp->zone_wp_update_buf,
+					     SD_BUF_SIZE,
+					     zno * sdkp->zone_info.zone_blocks, true);
+		spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
+		if (!ret)
+			sd_zbc_parse_report(sdkp, sdkp->zone_wp_update_buf + 64,
+					    zno, sd_zbc_update_wp_offset_cb,
+					    sdkp);
+	}
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
+
+	scsi_device_put(sdkp->device);
+}
+
+/**
+ * sd_zbc_prepare_zone_append() - Prepare an emulated ZONE_APPEND command.
+ * @cmd: the command to setup
+ * @lba: the LBA to patch
+ * @nr_blocks: the number of LBAs to be written
+ *
+ * Called from sd_setup_read_write_cmnd() for REQ_OP_ZONE_APPEND.
+ * @sd_zbc_prepare_zone_append() handles the necessary zone wrote locking and
+ * patching of the lba for an emulated ZONE_APPEND command.
+ *
+ * In case the cached write pointer offset is %SD_ZBC_INVALID_WP_OFST it will
+ * schedule a REPORT ZONES command and return BLK_STS_IOERR.
+ */
+blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
+					unsigned int nr_blocks)
+{
+	struct request *rq = scsi_cmd_to_rq(cmd);
+	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
+	unsigned int wp_offset, zno = blk_rq_zone_no(rq);
+	unsigned long flags;
+	blk_status_t ret;
+
+	ret = sd_zbc_cmnd_checks(cmd);
+	if (ret != BLK_STS_OK)
+		return ret;
+
+	if (!blk_rq_zone_is_seq(rq))
+		return BLK_STS_IOERR;
+
+	/* Unlock of the write lock will happen in sd_zbc_complete() */
+	if (!blk_req_zone_write_trylock(rq))
+		return BLK_STS_ZONE_RESOURCE;
+
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
+	wp_offset = sdkp->zones_wp_offset[zno];
+	switch (wp_offset) {
+	case SD_ZBC_INVALID_WP_OFST:
+		/*
+		 * We are about to schedule work to update a zone write pointer
+		 * offset, which will cause the zone append command to be
+		 * requeued. So make sure that the scsi device does not go away
+		 * while the work is being processed.
+		 */
+		if (scsi_device_get(sdkp->device)) {
+			ret = BLK_STS_IOERR;
+			break;
+		}
+		sdkp->zones_wp_offset[zno] = SD_ZBC_UPDATING_WP_OFST;
+		schedule_work(&sdkp->zone_wp_offset_work);
+		fallthrough;
+	case SD_ZBC_UPDATING_WP_OFST:
+		ret = BLK_STS_DEV_RESOURCE;
+		break;
+	default:
+		wp_offset = sectors_to_logical(sdkp->device, wp_offset);
+		if (wp_offset + nr_blocks > sdkp->zone_info.zone_blocks) {
+			ret = BLK_STS_IOERR;
+			break;
+		}
+
+		trace_scsi_prepare_zone_append(cmd, *lba, wp_offset);
+		*lba += wp_offset;
+	}
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
+	if (ret)
+		blk_req_zone_write_unlock(rq);
+	return ret;
+}
+
+/**
+ * sd_zbc_setup_zone_mgmt_cmnd - Prepare a zone ZBC_OUT command. The operations
+ *			can be RESET WRITE POINTER, OPEN, CLOSE or FINISH.
+ * @cmd: the command to setup
+ * @op: Operation to be performed
+ * @all: All zones control
+ *
+ * Called from sd_init_command() for REQ_OP_ZONE_RESET, REQ_OP_ZONE_RESET_ALL,
+ * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE or REQ_OP_ZONE_FINISH requests.
+ */
+blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
+					 unsigned char op, bool all)
+{
+	struct request *rq = scsi_cmd_to_rq(cmd);
+	sector_t sector = blk_rq_pos(rq);
+	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
+	sector_t block = sectors_to_logical(sdkp->device, sector);
+	blk_status_t ret;
+
+	ret = sd_zbc_cmnd_checks(cmd);
+	if (ret != BLK_STS_OK)
+		return ret;
+
+	cmd->cmd_len = 16;
+	memset(cmd->cmnd, 0, cmd->cmd_len);
+	cmd->cmnd[0] = ZBC_OUT;
+	cmd->cmnd[1] = op;
+	if (all)
+		cmd->cmnd[14] = 0x1;
+	else
+		put_unaligned_be64(block, &cmd->cmnd[2]);
+
+	rq->timeout = SD_TIMEOUT;
+	cmd->sc_data_direction = DMA_NONE;
+	cmd->transfersize = 0;
+	cmd->allowed = 0;
+
+	return BLK_STS_OK;
+}
+
+static bool sd_zbc_need_zone_wp_update(struct request *rq)
+{
+	switch (req_op(rq)) {
+	case REQ_OP_ZONE_APPEND:
+	case REQ_OP_ZONE_FINISH:
+	case REQ_OP_ZONE_RESET:
+	case REQ_OP_ZONE_RESET_ALL:
+		return true;
+	case REQ_OP_WRITE:
+	case REQ_OP_WRITE_ZEROES:
+		return blk_rq_zone_is_seq(rq);
+	default:
+		return false;
+	}
+}
+
+/**
+ * sd_zbc_zone_wp_update - Update cached zone write pointer upon cmd completion
+ * @cmd: Completed command
+ * @good_bytes: Command reply bytes
+ *
+ * Called from sd_zbc_complete() to handle the update of the cached zone write
+ * pointer value in case an update is needed.
+ */
+static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
+					  unsigned int good_bytes)
+{
+	int result = cmd->result;
+	struct request *rq = scsi_cmd_to_rq(cmd);
+	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
+	unsigned int zno = blk_rq_zone_no(rq);
+	enum req_op op = req_op(rq);
+	unsigned long flags;
+
+	/*
+	 * If we got an error for a command that needs updating the write
+	 * pointer offset cache, we must mark the zone wp offset entry as
+	 * invalid to force an update from disk the next time a zone append
+	 * command is issued.
+	 */
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
+
+	if (result && op != REQ_OP_ZONE_RESET_ALL) {
+		if (op == REQ_OP_ZONE_APPEND) {
+			/* Force complete completion (no retry) */
+			good_bytes = 0;
+			scsi_set_resid(cmd, blk_rq_bytes(rq));
+		}
+
+		/*
+		 * Force an update of the zone write pointer offset on
+		 * the next zone append access.
+		 */
+		if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
+			sdkp->zones_wp_offset[zno] = SD_ZBC_INVALID_WP_OFST;
+		goto unlock_wp_offset;
+	}
+
+	switch (op) {
+	case REQ_OP_ZONE_APPEND:
+		trace_scsi_zone_wp_update(cmd, rq->__sector,
+				  sdkp->zones_wp_offset[zno], good_bytes);
+		rq->__sector += sdkp->zones_wp_offset[zno];
+		fallthrough;
+	case REQ_OP_WRITE_ZEROES:
+	case REQ_OP_WRITE:
+		if (sdkp->zones_wp_offset[zno] < sd_zbc_zone_sectors(sdkp))
+			sdkp->zones_wp_offset[zno] +=
+						good_bytes >> SECTOR_SHIFT;
+		break;
+	case REQ_OP_ZONE_RESET:
+		sdkp->zones_wp_offset[zno] = 0;
+		break;
+	case REQ_OP_ZONE_FINISH:
+		sdkp->zones_wp_offset[zno] = sd_zbc_zone_sectors(sdkp);
+		break;
+	case REQ_OP_ZONE_RESET_ALL:
+		memset(sdkp->zones_wp_offset, 0,
+		       sdkp->zone_info.nr_zones * sizeof(unsigned int));
+		break;
+	default:
+		break;
+	}
+
+unlock_wp_offset:
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
+
+	return good_bytes;
+}
+
+/**
+ * sd_zbc_complete - ZBC command post processing.
+ * @cmd: Completed command
+ * @good_bytes: Command reply bytes
+ * @sshdr: command sense header
+ *
+ * Called from sd_done() to handle zone commands errors and updates to the
+ * device queue zone write pointer offset cahce.
+ */
+unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
+		     struct scsi_sense_hdr *sshdr)
+{
+	int result = cmd->result;
+	struct request *rq = scsi_cmd_to_rq(cmd);
+
+	if (op_is_zone_mgmt(req_op(rq)) &&
+	    result &&
+	    sshdr->sense_key == ILLEGAL_REQUEST &&
+	    sshdr->asc == 0x24) {
+		/*
+		 * INVALID FIELD IN CDB error: a zone management command was
+		 * attempted on a conventional zone. Nothing to worry about,
+		 * so be quiet about the error.
+		 */
+		rq->rq_flags |= RQF_QUIET;
+	} else if (sd_zbc_need_zone_wp_update(rq))
+		good_bytes = sd_zbc_zone_wp_update(cmd, good_bytes);
+
+	if (req_op(rq) == REQ_OP_ZONE_APPEND)
+		blk_req_zone_write_unlock(rq);
+
+	return good_bytes;
+}
+
+/**
+ * sd_zbc_check_zoned_characteristics - Check zoned block device characteristics
+ * @sdkp: Target disk
+ * @buf: Buffer where to store the VPD page data
+ *
+ * Read VPD page B6, get information and check that reads are unconstrained.
+ */
+static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
+					      unsigned char *buf)
+{
+	u64 zone_starting_lba_gran;
+
+	if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
+		sd_printk(KERN_NOTICE, sdkp,
+			  "Read zoned characteristics VPD page failed\n");
+		return -ENODEV;
+	}
+
+	if (sdkp->device->type != TYPE_ZBC) {
+		/* Host-aware */
+		sdkp->urswrz = 1;
+		sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
+		sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
+		sdkp->zones_max_open = 0;
+		return 0;
+	}
+
+	/* Host-managed */
+	sdkp->urswrz = buf[4] & 1;
+	sdkp->zones_optimal_open = 0;
+	sdkp->zones_optimal_nonseq = 0;
+	sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
+	/* Check zone alignment method */
+	switch (buf[23] & 0xf) {
+	case 0:
+	case ZBC_CONSTANT_ZONE_LENGTH:
+		/* Use zone length */
+		break;
+	case ZBC_CONSTANT_ZONE_START_OFFSET:
+		zone_starting_lba_gran = get_unaligned_be64(&buf[24]);
+		if (zone_starting_lba_gran == 0 ||
+		    !is_power_of_2(zone_starting_lba_gran) ||
+		    logical_to_sectors(sdkp->device, zone_starting_lba_gran) >
+		    UINT_MAX) {
+			sd_printk(KERN_ERR, sdkp,
+				  "Invalid zone starting LBA granularity %llu\n",
+				  zone_starting_lba_gran);
+			return -ENODEV;
+		}
+		sdkp->zone_starting_lba_gran = zone_starting_lba_gran;
+		break;
+	default:
+		sd_printk(KERN_ERR, sdkp, "Invalid zone alignment method\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Check for unconstrained reads: host-managed devices with
+	 * constrained reads (drives failing read after write pointer)
+	 * are not supported.
+	 */
+	if (!sdkp->urswrz) {
+		if (sdkp->first_scan)
+			sd_printk(KERN_NOTICE, sdkp,
+			  "constrained reads devices are not supported\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/**
+ * sd_zbc_check_capacity - Check the device capacity
+ * @sdkp: Target disk
+ * @buf: command buffer
+ * @zblocks: zone size in logical blocks
+ *
+ * Get the device zone size and check that the device capacity as reported
+ * by READ CAPACITY matches the max_lba value (plus one) of the report zones
+ * command reply for devices with RC_BASIS == 0.
+ *
+ * Returns 0 upon success or an error code upon failure.
+ */
+static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf,
+				 u32 *zblocks)
+{
+	u64 zone_blocks;
+	sector_t max_lba;
+	unsigned char *rec;
+	int ret;
+
+	/* Do a report zone to get max_lba and the size of the first zone */
+	ret = sd_zbc_do_report_zones(sdkp, buf, SD_BUF_SIZE, 0, false);
+	if (ret)
+		return ret;
+
+	if (sdkp->rc_basis == 0) {
+		/* The max_lba field is the capacity of this device */
+		max_lba = get_unaligned_be64(&buf[8]);
+		if (sdkp->capacity != max_lba + 1) {
+			if (sdkp->first_scan)
+				sd_printk(KERN_WARNING, sdkp,
+					"Changing capacity from %llu to max LBA+1 %llu\n",
+					(unsigned long long)sdkp->capacity,
+					(unsigned long long)max_lba + 1);
+			sdkp->capacity = max_lba + 1;
+		}
+	}
+
+	if (sdkp->zone_starting_lba_gran == 0) {
+		/* Get the size of the first reported zone */
+		rec = buf + 64;
+		zone_blocks = get_unaligned_be64(&rec[8]);
+		if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
+			if (sdkp->first_scan)
+				sd_printk(KERN_NOTICE, sdkp,
+					  "Zone size too large\n");
+			return -EFBIG;
+		}
+	} else {
+		zone_blocks = sdkp->zone_starting_lba_gran;
+	}
+
+	if (!is_power_of_2(zone_blocks)) {
+		sd_printk(KERN_ERR, sdkp,
+			  "Zone size %llu is not a power of two.\n",
+			  zone_blocks);
+		return -EINVAL;
+	}
+
+	*zblocks = zone_blocks;
+
+	return 0;
+}
+
+static void sd_zbc_print_zones(struct scsi_disk *sdkp)
+{
+	if (!sd_is_zoned(sdkp) || !sdkp->capacity)
+		return;
+
+	if (sdkp->capacity & (sdkp->zone_info.zone_blocks - 1))
+		sd_printk(KERN_NOTICE, sdkp,
+			  "%u zones of %u logical blocks + 1 runt zone\n",
+			  sdkp->zone_info.nr_zones - 1,
+			  sdkp->zone_info.zone_blocks);
+	else
+		sd_printk(KERN_NOTICE, sdkp,
+			  "%u zones of %u logical blocks\n",
+			  sdkp->zone_info.nr_zones,
+			  sdkp->zone_info.zone_blocks);
+}
+
+static int sd_zbc_init_disk(struct scsi_disk *sdkp)
+{
+	sdkp->zones_wp_offset = NULL;
+	spin_lock_init(&sdkp->zones_wp_offset_lock);
+	sdkp->rev_wp_offset = NULL;
+	mutex_init(&sdkp->rev_mutex);
+	INIT_WORK(&sdkp->zone_wp_offset_work, sd_zbc_update_wp_offset_workfn);
+	sdkp->zone_wp_update_buf = kzalloc(SD_BUF_SIZE, GFP_KERNEL);
+	if (!sdkp->zone_wp_update_buf)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void sd_zbc_free_zone_info(struct scsi_disk *sdkp)
+{
+	if (!sdkp->zone_wp_update_buf)
+		return;
+
+	/* Serialize against revalidate zones */
+	mutex_lock(&sdkp->rev_mutex);
+
+	kvfree(sdkp->zones_wp_offset);
+	sdkp->zones_wp_offset = NULL;
+	kfree(sdkp->zone_wp_update_buf);
+	sdkp->zone_wp_update_buf = NULL;
+
+	sdkp->early_zone_info = (struct zoned_disk_info){ };
+	sdkp->zone_info = (struct zoned_disk_info){ };
+
+	mutex_unlock(&sdkp->rev_mutex);
+}
+
+static void sd_zbc_revalidate_zones_cb(struct gendisk *disk)
+{
+	struct scsi_disk *sdkp = scsi_disk(disk);
+
+	swap(sdkp->zones_wp_offset, sdkp->rev_wp_offset);
+}
+
+/*
+ * Call blk_revalidate_disk_zones() if any of the zoned disk properties have
+ * changed that make it necessary to call that function. Called by
+ * sd_revalidate_disk() after the gendisk capacity has been set.
+ */
+int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
+{
+	struct gendisk *disk = sdkp->disk;
+	struct request_queue *q = disk->queue;
+	u32 zone_blocks = sdkp->early_zone_info.zone_blocks;
+	unsigned int nr_zones = sdkp->early_zone_info.nr_zones;
+	u32 max_append;
+	int ret = 0;
+	unsigned int flags;
+
+	/*
+	 * For all zoned disks, initialize zone append emulation data if not
+	 * already done. This is necessary also for host-aware disks used as
+	 * regular disks due to the presence of partitions as these partitions
+	 * may be deleted and the disk zoned model changed back from
+	 * BLK_ZONED_NONE to BLK_ZONED_HA.
+	 */
+	if (sd_is_zoned(sdkp) && !sdkp->zone_wp_update_buf) {
+		ret = sd_zbc_init_disk(sdkp);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * There is nothing to do for regular disks, including host-aware disks
+	 * that have partitions.
+	 */
+	if (!blk_queue_is_zoned(q))
+		return 0;
+
+	/*
+	 * Make sure revalidate zones are serialized to ensure exclusive
+	 * updates of the scsi disk data.
+	 */
+	mutex_lock(&sdkp->rev_mutex);
+
+	if (sdkp->zone_info.zone_blocks == zone_blocks &&
+	    sdkp->zone_info.nr_zones == nr_zones &&
+	    disk->nr_zones == nr_zones)
+		goto unlock;
+
+	flags = memalloc_noio_save();
+	sdkp->zone_info.zone_blocks = zone_blocks;
+	sdkp->zone_info.nr_zones = nr_zones;
+	sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_KERNEL);
+	if (!sdkp->rev_wp_offset) {
+		ret = -ENOMEM;
+		memalloc_noio_restore(flags);
+		goto unlock;
+	}
+
+	ret = blk_revalidate_disk_zones(disk, sd_zbc_revalidate_zones_cb);
+
+	memalloc_noio_restore(flags);
+	kvfree(sdkp->rev_wp_offset);
+	sdkp->rev_wp_offset = NULL;
+
+	if (ret) {
+		sdkp->zone_info = (struct zoned_disk_info){ };
+		sdkp->capacity = 0;
+		goto unlock;
+	}
+
+	max_append = min_t(u32, logical_to_sectors(sdkp->device, zone_blocks),
+			   q->limits.max_segments << (PAGE_SHIFT - 9));
+	max_append = min_t(u32, max_append, queue_max_hw_sectors(q));
+
+	blk_queue_max_zone_append_sectors(q, max_append);
+
+	sd_zbc_print_zones(sdkp);
+
+unlock:
+	mutex_unlock(&sdkp->rev_mutex);
+
+	return ret;
+}
+
+/**
+ * sd_zbc_read_zones - Read zone information and update the request queue
+ * @sdkp: SCSI disk pointer.
+ * @buf: 512 byte buffer used for storing SCSI command output.
+ *
+ * Read zone information and update the request queue zone characteristics and
+ * also the zoned device information in *sdkp. Called by sd_revalidate_disk()
+ * before the gendisk capacity has been set.
+ */
+int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
+{
+	struct gendisk *disk = sdkp->disk;
+	struct request_queue *q = disk->queue;
+	unsigned int nr_zones;
+	u32 zone_blocks = 0;
+	int ret;
+
+	if (!sd_is_zoned(sdkp)) {
+		/*
+		 * Device managed or normal SCSI disk, no special handling
+		 * required. Nevertheless, free the disk zone information in
+		 * case the device type changed.
+		 */
+		sd_zbc_free_zone_info(sdkp);
+		return 0;
+	}
+
+	/* READ16/WRITE16/SYNC16 is mandatory for ZBC devices */
+	sdkp->device->use_16_for_rw = 1;
+	sdkp->device->use_10_for_rw = 0;
+	sdkp->device->use_16_for_sync = 1;
+
+	if (!blk_queue_is_zoned(q)) {
+		/*
+		 * This can happen for a host aware disk with partitions.
+		 * The block device zone model was already cleared by
+		 * disk_set_zoned(). Only free the scsi disk zone
+		 * information and exit early.
+		 */
+		sd_zbc_free_zone_info(sdkp);
+		return 0;
+	}
+
+	/* Check zoned block device characteristics (unconstrained reads) */
+	ret = sd_zbc_check_zoned_characteristics(sdkp, buf);
+	if (ret)
+		goto err;
+
+	/* Check the device capacity reported by report zones */
+	ret = sd_zbc_check_capacity(sdkp, buf, &zone_blocks);
+	if (ret != 0)
+		goto err;
+
+	/* The drive satisfies the kernel restrictions: set it up */
+	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
+	blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
+	if (sdkp->zones_max_open == U32_MAX)
+		disk_set_max_open_zones(disk, 0);
+	else
+		disk_set_max_open_zones(disk, sdkp->zones_max_open);
+	disk_set_max_active_zones(disk, 0);
+	nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
+
+	/*
+	 * Per ZBC and ZAC specifications, writes in sequential write required
+	 * zones of host-managed devices must be aligned to the device physical
+	 * block size.
+	 */
+	if (blk_queue_zoned_model(q) == BLK_ZONED_HM)
+		blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
+
+	sdkp->early_zone_info.nr_zones = nr_zones;
+	sdkp->early_zone_info.zone_blocks = zone_blocks;
+
+	return 0;
+
+err:
+	sdkp->capacity = 0;
+
+	return ret;
+}