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, 657 insertions, 0 deletions

diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
new file mode 100644
index 000000000..7b192d88f
--- /dev/null
+++ b/include/scsi/iscsi_proto.h
@@ -0,0 +1,657 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RFC 3720 (iSCSI) protocol data types
+ *
+ * Copyright (C) 2005 Dmitry Yusupov
+ * Copyright (C) 2005 Alex Aizman
+ * maintained by open-iscsi@googlegroups.com
+ */
+
+#ifndef ISCSI_PROTO_H
+#define ISCSI_PROTO_H
+
+#include <linux/types.h>
+#include <scsi/scsi.h>
+
+#define ISCSI_DRAFT20_VERSION	0x00
+
+/* default iSCSI listen port for incoming connections */
+#define ISCSI_LISTEN_PORT	3260
+
+/* iSCSI header length */
+#define ISCSI_HDR_LEN		48
+
+/* iSCSI CRC32C length */
+#define ISCSI_CRC_LEN		4
+
+/* Padding word length */
+#define ISCSI_PAD_LEN		4
+
+/*
+ * Serial Number Arithmetic, 32 bits, RFC1982
+ */
+
+static inline int iscsi_sna_lt(u32 n1, u32 n2)
+{
+	return (s32)(n1 - n2) < 0;
+}
+
+static inline int iscsi_sna_lte(u32 n1, u32 n2)
+{
+	return (s32)(n1 - n2) <= 0;
+}
+
+static inline int iscsi_sna_gt(u32 n1, u32 n2)
+{
+	return (s32)(n1 - n2) > 0;
+}
+
+static inline int iscsi_sna_gte(u32 n1, u32 n2)
+{
+	return (s32)(n1 - n2) >= 0;
+}
+
+/*
+ * useful common(control and data paths) macro
+ */
+#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
+#define hton24(p, v) { \
+        p[0] = (((v) >> 16) & 0xFF); \
+        p[1] = (((v) >> 8) & 0xFF); \
+        p[2] = ((v) & 0xFF); \
+}
+#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
+
+/* initiator tags; opaque for target */
+typedef uint32_t __bitwise itt_t;
+/* below makes sense only for initiator that created this tag */
+#define build_itt(itt, age) ((__force itt_t)\
+	((itt) | ((age) << ISCSI_AGE_SHIFT)))
+#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
+#define RESERVED_ITT ((__force itt_t)0xffffffff)
+
+/*
+ * iSCSI Template Message Header
+ */
+struct iscsi_hdr {
+	uint8_t		opcode;
+	uint8_t		flags;		/* Final bit */
+	uint8_t		rsvd2[2];
+	uint8_t		hlength;	/* AHSs total length */
+	uint8_t		dlength[3];	/* Data length */
+	struct scsi_lun	lun;
+	itt_t		itt;		/* Initiator Task Tag, opaque for target */
+	__be32		ttt;		/* Target Task Tag */
+	__be32		statsn;
+	__be32		exp_statsn;
+	__be32		max_statsn;
+	uint8_t		other[12];
+};
+
+/************************* RFC 3720 Begin *****************************/
+
+#define ISCSI_RESERVED_TAG		0xffffffff
+
+/* Opcode encoding bits */
+#define ISCSI_OP_RETRY			0x80
+#define ISCSI_OP_IMMEDIATE		0x40
+#define ISCSI_OPCODE_MASK		0x3F
+
+/* Initiator Opcode values */
+#define ISCSI_OP_NOOP_OUT		0x00
+#define ISCSI_OP_SCSI_CMD		0x01
+#define ISCSI_OP_SCSI_TMFUNC		0x02
+#define ISCSI_OP_LOGIN			0x03
+#define ISCSI_OP_TEXT			0x04
+#define ISCSI_OP_SCSI_DATA_OUT		0x05
+#define ISCSI_OP_LOGOUT			0x06
+#define ISCSI_OP_SNACK			0x10
+
+#define ISCSI_OP_VENDOR1_CMD		0x1c
+#define ISCSI_OP_VENDOR2_CMD		0x1d
+#define ISCSI_OP_VENDOR3_CMD		0x1e
+#define ISCSI_OP_VENDOR4_CMD		0x1f
+
+/* Target Opcode values */
+#define ISCSI_OP_NOOP_IN		0x20
+#define ISCSI_OP_SCSI_CMD_RSP		0x21
+#define ISCSI_OP_SCSI_TMFUNC_RSP	0x22
+#define ISCSI_OP_LOGIN_RSP		0x23
+#define ISCSI_OP_TEXT_RSP		0x24
+#define ISCSI_OP_SCSI_DATA_IN		0x25
+#define ISCSI_OP_LOGOUT_RSP		0x26
+#define ISCSI_OP_R2T			0x31
+#define ISCSI_OP_ASYNC_EVENT		0x32
+#define ISCSI_OP_REJECT			0x3f
+
+struct iscsi_ahs_hdr {
+	__be16 ahslength;
+	uint8_t ahstype;
+	uint8_t ahspec[5];
+};
+
+#define ISCSI_AHSTYPE_CDB		1
+#define ISCSI_AHSTYPE_RLENGTH		2
+#define ISCSI_CDB_SIZE			16
+
+/* iSCSI PDU Header */
+struct iscsi_scsi_req {
+	uint8_t opcode;
+	uint8_t flags;
+	__be16 rsvd2;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	struct scsi_lun lun;
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32 data_length;
+	__be32 cmdsn;
+	__be32 exp_statsn;
+	uint8_t cdb[ISCSI_CDB_SIZE];	/* SCSI Command Block */
+	/* Additional Data (Command Dependent) */
+};
+
+/* Command PDU flags */
+#define ISCSI_FLAG_CMD_FINAL		0x80
+#define ISCSI_FLAG_CMD_READ		0x40
+#define ISCSI_FLAG_CMD_WRITE		0x20
+#define ISCSI_FLAG_CMD_ATTR_MASK	0x07	/* 3 bits */
+
+/* SCSI Command Attribute values */
+#define ISCSI_ATTR_UNTAGGED		0
+#define ISCSI_ATTR_SIMPLE		1
+#define ISCSI_ATTR_ORDERED		2
+#define ISCSI_ATTR_HEAD_OF_QUEUE	3
+#define ISCSI_ATTR_ACA			4
+
+struct iscsi_rlength_ahdr {
+	__be16 ahslength;
+	uint8_t ahstype;
+	uint8_t reserved;
+	__be32 read_length;
+};
+
+/* Extended CDB AHS */
+struct iscsi_ecdb_ahdr {
+	__be16 ahslength;	/* CDB length - 15, including reserved byte */
+	uint8_t ahstype;
+	uint8_t reserved;
+	/* 4-byte aligned extended CDB spillover */
+	uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
+};
+
+/* SCSI Response Header */
+struct iscsi_scsi_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t response;
+	uint8_t cmd_status;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd[8];
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	rsvd1;
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	__be32	exp_datasn;
+	__be32	bi_residual_count;
+	__be32	residual_count;
+	/* Response or Sense Data (optional) */
+};
+
+/* Command Response PDU flags */
+#define ISCSI_FLAG_CMD_BIDI_OVERFLOW	0x10
+#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW	0x08
+#define ISCSI_FLAG_CMD_OVERFLOW		0x04
+#define ISCSI_FLAG_CMD_UNDERFLOW	0x02
+
+/* iSCSI Status values. Valid if Rsp Selector bit is not set */
+#define ISCSI_STATUS_CMD_COMPLETED	0
+#define ISCSI_STATUS_TARGET_FAILURE	1
+#define ISCSI_STATUS_SUBSYS_FAILURE	2
+
+/* Asynchronous Event Header */
+struct iscsi_async {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t rsvd3;
+	uint8_t dlength[3];
+	struct scsi_lun	lun;
+	uint8_t rsvd4[8];
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	uint8_t async_event;
+	uint8_t async_vcode;
+	__be16	param1;
+	__be16	param2;
+	__be16	param3;
+	uint8_t rsvd5[4];
+};
+
+/* iSCSI Event Codes */
+#define ISCSI_ASYNC_MSG_SCSI_EVENT			0
+#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT			1
+#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION		2
+#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS	3
+#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION		4
+#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC			255
+
+/* NOP-Out Message */
+struct iscsi_nopout {
+	uint8_t opcode;
+	uint8_t flags;
+	__be16	rsvd2;
+	uint8_t rsvd3;
+	uint8_t dlength[3];
+	struct scsi_lun	lun;
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	ttt;	/* Target Transfer Tag */
+	__be32	cmdsn;
+	__be32	exp_statsn;
+	uint8_t rsvd4[16];
+};
+
+/* NOP-In Message */
+struct iscsi_nopin {
+	uint8_t opcode;
+	uint8_t flags;
+	__be16	rsvd2;
+	uint8_t rsvd3;
+	uint8_t dlength[3];
+	struct scsi_lun	lun;
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	ttt;	/* Target Transfer Tag */
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	uint8_t rsvd4[12];
+};
+
+/* SCSI Task Management Message Header */
+struct iscsi_tm {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd1[2];
+	uint8_t hlength;
+	uint8_t dlength[3];
+	struct scsi_lun lun;
+	itt_t	 itt;	/* Initiator Task Tag */
+	itt_t	 rtt;	/* Reference Task Tag */
+	__be32	cmdsn;
+	__be32	exp_statsn;
+	__be32	refcmdsn;
+	__be32	exp_datasn;
+	uint8_t rsvd2[8];
+};
+
+#define ISCSI_FLAG_TM_FUNC_MASK			0x7F
+
+/* Function values */
+#define ISCSI_TM_FUNC_ABORT_TASK		1
+#define ISCSI_TM_FUNC_ABORT_TASK_SET		2
+#define ISCSI_TM_FUNC_CLEAR_ACA			3
+#define ISCSI_TM_FUNC_CLEAR_TASK_SET		4
+#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET	5
+#define ISCSI_TM_FUNC_TARGET_WARM_RESET		6
+#define ISCSI_TM_FUNC_TARGET_COLD_RESET		7
+#define ISCSI_TM_FUNC_TASK_REASSIGN		8
+
+#define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
+
+/* SCSI Task Management Response Header */
+struct iscsi_tm_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t response;	/* see Response values below */
+	uint8_t qualifier;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd2[8];
+	itt_t	 itt;	/* Initiator Task Tag */
+	itt_t	 rtt;	/* Reference Task Tag */
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	uint8_t rsvd3[12];
+};
+
+/* Response values */
+#define ISCSI_TMF_RSP_COMPLETE		0x00
+#define ISCSI_TMF_RSP_NO_TASK		0x01
+#define ISCSI_TMF_RSP_NO_LUN		0x02
+#define ISCSI_TMF_RSP_TASK_ALLEGIANT	0x03
+#define ISCSI_TMF_RSP_NO_FAILOVER	0x04
+#define ISCSI_TMF_RSP_NOT_SUPPORTED	0x05
+#define ISCSI_TMF_RSP_AUTH_FAILED	0x06
+#define ISCSI_TMF_RSP_REJECTED		0xff
+
+/* Ready To Transfer Header */
+struct iscsi_r2t_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t	hlength;
+	uint8_t	dlength[3];
+	struct scsi_lun	lun;
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	ttt;	/* Target Transfer Tag */
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	__be32	r2tsn;
+	__be32	data_offset;
+	__be32	data_length;
+};
+
+/* SCSI Data Hdr */
+struct iscsi_data {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t rsvd3;
+	uint8_t dlength[3];
+	struct scsi_lun lun;
+	itt_t	 itt;
+	__be32	ttt;
+	__be32	rsvd4;
+	__be32	exp_statsn;
+	__be32	rsvd5;
+	__be32	datasn;
+	__be32	offset;
+	__be32	rsvd6;
+	/* Payload */
+};
+
+/* SCSI Data Response Hdr */
+struct iscsi_data_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2;
+	uint8_t cmd_status;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	struct scsi_lun	lun;
+	itt_t	 itt;
+	__be32	ttt;
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	__be32	datasn;
+	__be32	offset;
+	__be32	residual_count;
+};
+
+/* Data Response PDU flags */
+#define ISCSI_FLAG_DATA_ACK		0x40
+#define ISCSI_FLAG_DATA_OVERFLOW	0x04
+#define ISCSI_FLAG_DATA_UNDERFLOW	0x02
+#define ISCSI_FLAG_DATA_STATUS		0x01
+
+/* Text Header */
+struct iscsi_text {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd4[8];
+	itt_t	 itt;
+	__be32	ttt;
+	__be32	cmdsn;
+	__be32	exp_statsn;
+	uint8_t rsvd5[16];
+	/* Text - key=value pairs */
+};
+
+#define ISCSI_FLAG_TEXT_CONTINUE	0x40
+
+/* Text Response Header */
+struct iscsi_text_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd4[8];
+	itt_t	 itt;
+	__be32	ttt;
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	uint8_t rsvd5[12];
+	/* Text Response - key:value pairs */
+};
+
+/* Login Header */
+struct iscsi_login_req {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t max_version;	/* Max. version supported */
+	uint8_t min_version;	/* Min. version supported */
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t isid[6];	/* Initiator Session ID */
+	__be16	tsih;	/* Target Session Handle */
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be16	cid;
+	__be16	rsvd3;
+	__be32	cmdsn;
+	__be32	exp_statsn;
+	uint8_t rsvd5[16];
+};
+
+/* Login PDU flags */
+#define ISCSI_FLAG_LOGIN_TRANSIT		0x80
+#define ISCSI_FLAG_LOGIN_CONTINUE		0x40
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK	0x0C	/* 2 bits */
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE1		0x04
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE2		0x08
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE3		0x0C
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK	0x03	/* 2 bits */
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE1		0x01
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE2		0x02
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE3		0x03
+
+#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
+	((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
+#define ISCSI_LOGIN_NEXT_STAGE(flags) \
+	(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
+
+/* Login Response Header */
+struct iscsi_login_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t max_version;	/* Max. version supported */
+	uint8_t active_version;	/* Active version */
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t isid[6];	/* Initiator Session ID */
+	__be16	tsih;	/* Target Session Handle */
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	rsvd3;
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	uint8_t status_class;	/* see Login RSP ststus classes below */
+	uint8_t status_detail;	/* see Login RSP Status details below */
+	uint8_t rsvd4[10];
+};
+
+/* Login stage (phase) codes for CSG, NSG */
+#define ISCSI_INITIAL_LOGIN_STAGE		-1
+#define ISCSI_SECURITY_NEGOTIATION_STAGE	0
+#define ISCSI_OP_PARMS_NEGOTIATION_STAGE	1
+#define ISCSI_FULL_FEATURE_PHASE		3
+
+/* Login Status response classes */
+#define ISCSI_STATUS_CLS_SUCCESS		0x00
+#define ISCSI_STATUS_CLS_REDIRECT		0x01
+#define ISCSI_STATUS_CLS_INITIATOR_ERR		0x02
+#define ISCSI_STATUS_CLS_TARGET_ERR		0x03
+
+/* Login Status response detail codes */
+/* Class-0 (Success) */
+#define ISCSI_LOGIN_STATUS_ACCEPT		0x00
+
+/* Class-1 (Redirection) */
+#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP	0x01
+#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM	0x02
+
+/* Class-2 (Initiator Error) */
+#define ISCSI_LOGIN_STATUS_INIT_ERR		0x00
+#define ISCSI_LOGIN_STATUS_AUTH_FAILED		0x01
+#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN	0x02
+#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND	0x03
+#define ISCSI_LOGIN_STATUS_TGT_REMOVED		0x04
+#define ISCSI_LOGIN_STATUS_NO_VERSION		0x05
+#define ISCSI_LOGIN_STATUS_ISID_ERROR		0x06
+#define ISCSI_LOGIN_STATUS_MISSING_FIELDS	0x07
+#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED	0x08
+#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE	0x09
+#define ISCSI_LOGIN_STATUS_NO_SESSION		0x0a
+#define ISCSI_LOGIN_STATUS_INVALID_REQUEST	0x0b
+
+/* Class-3 (Target Error) */
+#define ISCSI_LOGIN_STATUS_TARGET_ERROR		0x00
+#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE	0x01
+#define ISCSI_LOGIN_STATUS_NO_RESOURCES		0x02
+
+/* Logout Header */
+struct iscsi_logout {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd1[2];
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd2[8];
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be16	cid;
+	uint8_t rsvd3[2];
+	__be32	cmdsn;
+	__be32	exp_statsn;
+	uint8_t rsvd4[16];
+};
+
+/* Logout PDU flags */
+#define ISCSI_FLAG_LOGOUT_REASON_MASK	0x7F
+
+/* logout reason_code values */
+
+#define ISCSI_LOGOUT_REASON_CLOSE_SESSION	0
+#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION	1
+#define ISCSI_LOGOUT_REASON_RECOVERY		2
+#define ISCSI_LOGOUT_REASON_AEN_REQUEST		3
+
+/* Logout Response Header */
+struct iscsi_logout_rsp {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t response;	/* see Logout response values below */
+	uint8_t rsvd2;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd3[8];
+	itt_t	 itt;	/* Initiator Task Tag */
+	__be32	rsvd4;
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	__be32	rsvd5;
+	__be16	t2wait;
+	__be16	t2retain;
+	__be32	rsvd6;
+};
+
+/* logout response status values */
+
+#define ISCSI_LOGOUT_SUCCESS			0
+#define ISCSI_LOGOUT_CID_NOT_FOUND		1
+#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED	2
+#define ISCSI_LOGOUT_CLEANUP_FAILED		3
+
+/* SNACK Header */
+struct iscsi_snack {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t rsvd2[2];
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t lun[8];
+	itt_t	 itt;
+	__be32  ttt;
+	uint8_t rsvd3[4];
+	__be32  exp_statsn;
+	uint8_t rsvd4[8];
+	__be32	begrun;
+	__be32	runlength;
+};
+
+/* SNACK PDU flags */
+#define ISCSI_FLAG_SNACK_TYPE_DATA		0
+#define ISCSI_FLAG_SNACK_TYPE_R2T		0
+#define ISCSI_FLAG_SNACK_TYPE_STATUS		1
+#define ISCSI_FLAG_SNACK_TYPE_DATA_ACK		2
+#define ISCSI_FLAG_SNACK_TYPE_RDATA		3
+#define ISCSI_FLAG_SNACK_TYPE_MASK	0x0F	/* 4 bits */
+
+/* Reject Message Header */
+struct iscsi_reject {
+	uint8_t opcode;
+	uint8_t flags;
+	uint8_t reason;
+	uint8_t rsvd2;
+	uint8_t hlength;
+	uint8_t dlength[3];
+	uint8_t rsvd3[8];
+	__be32  ffffffff;
+	uint8_t rsvd4[4];
+	__be32	statsn;
+	__be32	exp_cmdsn;
+	__be32	max_cmdsn;
+	__be32	datasn;
+	uint8_t rsvd5[8];
+	/* Text - Rejected hdr */
+};
+
+/* Reason for Reject */
+#define ISCSI_REASON_CMD_BEFORE_LOGIN	1
+#define ISCSI_REASON_DATA_DIGEST_ERROR	2
+#define ISCSI_REASON_DATA_SNACK_REJECT	3
+#define ISCSI_REASON_PROTOCOL_ERROR	4
+#define ISCSI_REASON_CMD_NOT_SUPPORTED	5
+#define ISCSI_REASON_IMM_CMD_REJECT		6
+#define ISCSI_REASON_TASK_IN_PROGRESS	7
+#define ISCSI_REASON_INVALID_SNACK		8
+#define ISCSI_REASON_BOOKMARK_INVALID	9
+#define ISCSI_REASON_BOOKMARK_NO_RESOURCES	10
+#define ISCSI_REASON_NEGOTIATION_RESET	11
+
+/* Max. number of Key=Value pairs in a text message */
+#define MAX_KEY_VALUE_PAIRS	8192
+
+/* maximum length for text keys/values */
+#define KEY_MAXLEN		64
+#define VALUE_MAXLEN		255
+#define TARGET_NAME_MAXLEN	VALUE_MAXLEN
+
+#define ISCSI_DEF_MAX_RECV_SEG_LEN		8192
+#define ISCSI_MIN_MAX_RECV_SEG_LEN		512
+#define ISCSI_MAX_MAX_RECV_SEG_LEN		16777215
+
+#define ISCSI_DEF_FIRST_BURST_LEN		65536
+#define ISCSI_MIN_FIRST_BURST_LEN		512
+#define ISCSI_MAX_FIRST_BURST_LEN		16777215
+
+#define ISCSI_DEF_MAX_BURST_LEN			262144
+#define ISCSI_MIN_MAX_BURST_LEN			512
+#define ISCSI_MAX_MAX_BURST_LEN			16777215
+
+#define ISCSI_DEF_TIME2WAIT			2
+
+#define ISCSI_NAME_LEN				224
+
+/************************* RFC 3720 End *****************************/
+
+#endif /* ISCSI_PROTO_H */