net/smc/smc_clc.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
  *
  *  CLC (connection layer control) handshake over initial TCP socket to
  *  prepare for RDMA traffic
  *
  *  Copyright IBM Corp. 2016
  *
  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  */

 #ifndef _SMC_CLC_H
 #define _SMC_CLC_H

 #include <rdma/ib_verbs.h>
 #include <linux/smc.h>

 #include "smc.h"
 #include "smc_netlink.h"

 #define SMC_CLC_PROPOSAL	0x01
 #define SMC_CLC_ACCEPT		0x02
 #define SMC_CLC_CONFIRM		0x03
 #define SMC_CLC_DECLINE		0x04

 #define SMC_TYPE_R		0		/* SMC-R only		      */
 #define SMC_TYPE_D		1		/* SMC-D only		      */
 #define SMC_TYPE_N		2		/* neither SMC-R nor SMC-D    */
 #define SMC_TYPE_B		3		/* SMC-R and SMC-D	      */
 #define CLC_WAIT_TIME		(6 * HZ)	/* max. wait time on clcsock  */
 #define CLC_WAIT_TIME_SHORT	HZ		/* short wait time on clcsock */
 #define SMC_CLC_DECL_MEM	0x01010000  /* insufficient memory resources  */
 #define SMC_CLC_DECL_TIMEOUT_CL	0x02010000  /* timeout w4 QP confirm link     */
 #define SMC_CLC_DECL_TIMEOUT_AL	0x02020000  /* timeout w4 QP add link	      */
 #define SMC_CLC_DECL_CNFERR	0x03000000  /* configuration error            */
 #define SMC_CLC_DECL_PEERNOSMC	0x03010000  /* peer did not indicate SMC      */
 #define SMC_CLC_DECL_IPSEC	0x03020000  /* IPsec usage		      */
 #define SMC_CLC_DECL_NOSMCDEV	0x03030000  /* no SMC device found (R or D)   */
 #define SMC_CLC_DECL_NOSMCDDEV	0x03030001  /* no SMC-D device found	      */
 #define SMC_CLC_DECL_NOSMCRDEV	0x03030002  /* no SMC-R device found	      */
 #define SMC_CLC_DECL_NOISM2SUPP	0x03030003  /* hardware has no ISMv2 support  */
 #define SMC_CLC_DECL_NOV2EXT	0x03030004  /* peer sent no clc v2 extension  */
 #define SMC_CLC_DECL_NOV2DEXT	0x03030005  /* peer sent no clc SMC-Dv2 ext.  */
 #define SMC_CLC_DECL_NOSEID	0x03030006  /* peer sent no SEID	      */
 #define SMC_CLC_DECL_NOSMCD2DEV	0x03030007  /* no SMC-Dv2 device found	      */
 #define SMC_CLC_DECL_NOUEID	0x03030008  /* peer sent no UEID	      */
 #define SMC_CLC_DECL_RELEASEERR	0x03030009  /* release version negotiate failed */
 #define SMC_CLC_DECL_MAXCONNERR	0x0303000a  /* max connections negotiate failed */
 #define SMC_CLC_DECL_MAXLINKERR	0x0303000b  /* max links negotiate failed */
 #define SMC_CLC_DECL_MODEUNSUPP	0x03040000  /* smc modes do not match (R or D)*/
 #define SMC_CLC_DECL_RMBE_EC	0x03050000  /* peer has eyecatcher in RMBE    */
 #define SMC_CLC_DECL_OPTUNSUPP	0x03060000  /* fastopen sockopt not supported */
 #define SMC_CLC_DECL_DIFFPREFIX	0x03070000  /* IP prefix / subnet mismatch    */
 #define SMC_CLC_DECL_GETVLANERR	0x03080000  /* err to get vlan id of ip device*/
 #define SMC_CLC_DECL_ISMVLANERR	0x03090000  /* err to reg vlan id on ism dev  */
 #define SMC_CLC_DECL_NOACTLINK	0x030a0000  /* no active smc-r link in lgr    */
 #define SMC_CLC_DECL_NOSRVLINK	0x030b0000  /* SMC-R link from srv not found  */
 #define SMC_CLC_DECL_VERSMISMAT	0x030c0000  /* SMC version mismatch	      */
 #define SMC_CLC_DECL_MAX_DMB	0x030d0000  /* SMC-D DMB limit exceeded       */
 #define SMC_CLC_DECL_NOROUTE	0x030e0000  /* SMC-Rv2 conn. no route to peer */
 #define SMC_CLC_DECL_NOINDIRECT	0x030f0000  /* SMC-Rv2 conn. indirect mismatch*/
 #define SMC_CLC_DECL_SYNCERR	0x04000000  /* synchronization error          */
 #define SMC_CLC_DECL_PEERDECL	0x05000000  /* peer declined during handshake */
 #define SMC_CLC_DECL_INTERR	0x09990000  /* internal error		      */
 #define SMC_CLC_DECL_ERR_RTOK	0x09990001  /*	 rtoken handling failed       */
 #define SMC_CLC_DECL_ERR_RDYLNK	0x09990002  /*	 ib ready link failed	      */
 #define SMC_CLC_DECL_ERR_REGBUF	0x09990003  /*	 reg rdma bufs failed	      */

 #define SMC_FIRST_CONTACT_MASK	0b10	/* first contact bit within typev2 */

 struct smc_clc_msg_hdr {	/* header1 of clc messages */
 	u8 eyecatcher[4];	/* eye catcher */
 	u8 type;		/* proposal / accept / confirm / decline */
 	__be16 length;
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 version : 4,
 	   typev2  : 2,
 	   typev1  : 2;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 typev1  : 2,
 	   typev2  : 2,
 	   version : 4;
 #endif
 } __packed;			/* format defined in RFC7609 */

 struct smc_clc_msg_trail {	/* trailer of clc messages */
 	u8 eyecatcher[4];
 };

 struct smc_clc_msg_local {	/* header2 of clc messages */
 	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
 	u8 gid[16];		/* gid of ib_device port */
 	u8 mac[6];		/* mac of ib_device port */
 };

 /* Struct would be 4 byte aligned, but it is used in an array that is sent
  * to peers and must conform to RFC7609, hence we need to use packed here.
  */
 struct smc_clc_ipv6_prefix {
 	struct in6_addr prefix;
 	u8 prefix_len;
 } __packed;			/* format defined in RFC7609 */

 #if defined(__BIG_ENDIAN_BITFIELD)
 struct smc_clc_v2_flag {
 	u8 release : 4,
 	   rsvd    : 3,
 	   seid    : 1;
 };
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 struct smc_clc_v2_flag {
 	u8 seid   : 1,
 	rsvd      : 3,
 	release   : 4;
 };
 #endif

 struct smc_clnt_opts_area_hdr {
 	u8 eid_cnt;		/* number of user defined EIDs */
 	u8 ism_gid_cnt;		/* number of ISMv2 GIDs */
 	u8 reserved1;
 	struct smc_clc_v2_flag flag;
 	u8 reserved2[2];
 	__be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
 };

 struct smc_clc_smcd_gid_chid {
 	__be64 gid;		/* ISM GID */
 	__be16 chid;		/* ISMv2 CHID */
 } __packed;		/* format defined in
 			 * IBM Shared Memory Communications Version 2
 			 * (https://www.ibm.com/support/pages/node/6326337)
 			 */

 struct smc_clc_v2_extension {
 	/* New members must be added within the struct_group() macro below. */
 	struct_group_tagged(smc_clc_v2_extension_fixed, fixed,
 		struct smc_clnt_opts_area_hdr hdr;
 		u8 roce[16];		/* RoCEv2 GID */
 		u8 max_conns;
 		u8 max_links;
 		__be16 feature_mask;
 		u8 reserved[12];
 	);
 	u8 user_eids[][SMC_MAX_EID_LEN];
 };
 static_assert(offsetof(struct smc_clc_v2_extension, user_eids) == sizeof(struct smc_clc_v2_extension_fixed),
 	      "struct member likely outside of struct_group_tagged()");

 struct smc_clc_msg_proposal_prefix {	/* prefix part of clc proposal message*/
 	__be32 outgoing_subnet;	/* subnet mask */
 	u8 prefix_len;		/* number of significant bits in mask */
 	u8 reserved[2];
 	u8 ipv6_prefixes_cnt;	/* number of IPv6 prefixes in prefix array */
 } __aligned(4);

 struct smc_clc_msg_smcd {	/* SMC-D GID information */
 	struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
 	__be16 v2_ext_offset;	/* SMC Version 2 Extension Offset */
 	u8 vendor_oui[3];	/* vendor organizationally unique identifier */
 	u8 vendor_exp_options[5];
 	u8 reserved[20];
 };

 struct smc_clc_smcd_v2_extension {
 	/* New members must be added within the struct_group() macro below. */
 	struct_group_tagged(smc_clc_smcd_v2_extension_fixed, fixed,
 		u8 system_eid[SMC_MAX_EID_LEN];
 		u8 reserved[16];
 	);
 	struct smc_clc_smcd_gid_chid gidchid[];
 };
 static_assert(offsetof(struct smc_clc_smcd_v2_extension, gidchid) == sizeof(struct smc_clc_smcd_v2_extension_fixed),
 	      "struct member likely outside of struct_group_tagged()");

 struct smc_clc_msg_proposal {	/* clc proposal message sent by Linux */
 	struct smc_clc_msg_hdr hdr;
 	struct smc_clc_msg_local lcl;
 	__be16 iparea_offset;	/* offset to IP address information area */
 } __aligned(4);

 #define SMC_CLC_MAX_V6_PREFIX		8
 #define SMC_CLC_MAX_UEID		8
 #define SMCD_CLC_MAX_V2_GID_ENTRIES	8 /* max # of CHID-GID entries in CLC
 					   * proposal SMC-Dv2 extension.
 					   * each ISM device takes one entry and
 					   * each Emulated-ISM takes two entries
 					   */

 struct smc_clc_msg_proposal_area {
 	struct smc_clc_msg_proposal		pclc_base;
 	struct smc_clc_msg_smcd			pclc_smcd;
 	struct smc_clc_msg_proposal_prefix	pclc_prfx;
 	struct smc_clc_ipv6_prefix	pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
 	struct smc_clc_v2_extension_fixed	pclc_v2_ext;
 	u8			user_eids[SMC_CLC_MAX_UEID][SMC_MAX_EID_LEN];
 	struct smc_clc_smcd_v2_extension_fixed	pclc_smcd_v2_ext;
 	struct smc_clc_smcd_gid_chid
 				pclc_gidchids[SMCD_CLC_MAX_V2_GID_ENTRIES];
 	struct smc_clc_msg_trail		pclc_trl;
 };

 struct smcr_clc_msg_accept_confirm {	/* SMCR accept/confirm */
 	struct smc_clc_msg_local lcl;
 	u8 qpn[3];			/* QP number */
 	__be32 rmb_rkey;		/* RMB rkey */
 	u8 rmbe_idx;			/* Index of RMBE in RMB */
 	__be32 rmbe_alert_token;	/* unique connection id */
  #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 rmbe_size : 4,		/* buf size (compressed) */
 	   qp_mtu   : 4;		/* QP mtu */
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 qp_mtu   : 4,
 	   rmbe_size : 4;
 #endif
 	u8 reserved;
 	__be64 rmb_dma_addr;	/* RMB virtual address */
 	u8 reserved2;
 	u8 psn[3];		/* packet sequence number */
 } __packed;

 struct smcd_clc_msg_accept_confirm_common {	/* SMCD accept/confirm */
 	__be64 gid;		/* Sender GID */
 	__be64 token;		/* DMB token */
 	u8 dmbe_idx;		/* DMBE index */
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 dmbe_size : 4,	/* buf size (compressed) */
 	   reserved3 : 4;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 reserved3 : 4,
 	   dmbe_size : 4;
 #endif
 	u16 reserved4;
 	__be32 linkid;		/* Link identifier */
 } __packed;

 #define SMC_CLC_OS_ZOS		1
 #define SMC_CLC_OS_LINUX	2
 #define SMC_CLC_OS_AIX		3

 struct smc_clc_first_contact_ext {
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 v2_direct : 1,
 	   reserved  : 7;
 	u8 os_type : 4,
 	   release : 4;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 reserved  : 7,
 	   v2_direct : 1;
 	u8 release : 4,
 	   os_type : 4;
 #endif
 	u8 reserved2[2];
 	u8 hostname[SMC_MAX_HOSTNAME_LEN];
 };

 struct smc_clc_first_contact_ext_v2x {
 	struct smc_clc_first_contact_ext fce_v2_base;
 	union {
 		struct {
 			u8 max_conns; /* for SMC-R only */
 			u8 max_links; /* for SMC-R only */
 		};
 		u8 reserved3[2];	/* for SMC-D only */
 	};
 	__be16 feature_mask;
 	__be32 vendor_exp_options;
 	u8 reserved4[8];
 } __packed;		/* format defined in
 			 * IBM Shared Memory Communications Version 2 (Third Edition)
 			 * (https://www.ibm.com/support/pages/node/7009315)
 			 */

 struct smc_clc_fce_gid_ext {
 	u8 gid_cnt;
 	u8 reserved2[3];
 	u8 gid[][SMC_GID_SIZE];
 };

 struct smc_clc_msg_accept_confirm {	/* clc accept / confirm message */
 	struct smc_clc_msg_hdr hdr;
 	union {
 		struct { /* SMC-R */
 			struct smcr_clc_msg_accept_confirm r0;
 			struct { /* v2 only */
 				u8 eid[SMC_MAX_EID_LEN];
 				u8 reserved6[8];
 			} __packed r1;
 		};
 		struct { /* SMC-D */
 			struct smcd_clc_msg_accept_confirm_common d0;
 			struct { /* v2 only, but 12 bytes reserved in v1 */
 				__be16 chid;
 				u8 eid[SMC_MAX_EID_LEN];
 				__be64 gid_ext;
 			} __packed d1;
 		};
 	};
 };

 struct smc_clc_msg_decline {	/* clc decline message */
 	struct smc_clc_msg_hdr hdr;
 	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 	__be32 peer_diagnosis;	/* diagnosis information */
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 os_type  : 4,
 	   reserved : 4;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 reserved : 4,
 	   os_type  : 4;
 #endif
 	u8 reserved2[3];
 	struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
 } __aligned(4);

 #define SMC_DECL_DIAG_COUNT_V2	4 /* no. of additional peer diagnosis codes */

 struct smc_clc_msg_decline_v2 {	/* clc decline message */
 	struct smc_clc_msg_hdr hdr;
 	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 	__be32 peer_diagnosis;	/* diagnosis information */
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 os_type  : 4,
 	   reserved : 4;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 reserved : 4,
 	   os_type  : 4;
 #endif
 	u8 reserved2[3];
 	__be32 peer_diagnosis_v2[SMC_DECL_DIAG_COUNT_V2];
 	struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
 } __aligned(4);

 /* determine start of the prefix area within the proposal message */
 static inline struct smc_clc_msg_proposal_prefix *
 smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
 {
 	return (struct smc_clc_msg_proposal_prefix *)
 	       ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
 }

 static inline bool smcr_indicated(int smc_type)
 {
 	return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
 }

 static inline bool smcd_indicated(int smc_type)
 {
 	return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
 }

 static inline u8 smc_indicated_type(int is_smcd, int is_smcr)
 {
 	if (is_smcd && is_smcr)
 		return SMC_TYPE_B;
 	if (is_smcd)
 		return SMC_TYPE_D;
 	if (is_smcr)
 		return SMC_TYPE_R;
 	return SMC_TYPE_N;
 }

 /* get SMC-D info from proposal message */
 static inline struct smc_clc_msg_smcd *
 smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
 {
 	if (smcd_indicated(prop->hdr.typev1) &&
 	    ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
 		return NULL;

 	return (struct smc_clc_msg_smcd *)(prop + 1);
 }

 static inline struct smc_clc_v2_extension *
 smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
 {
 	struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);

 	if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
 		return NULL;

 	return (struct smc_clc_v2_extension *)
 	       ((u8 *)prop_smcd +
 	       offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
 	       sizeof(prop_smcd->v2_ext_offset) +
 	       ntohs(prop_smcd->v2_ext_offset));
 }

 static inline struct smc_clc_smcd_v2_extension *
 smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
 {
 	if (!prop_v2ext)
 		return NULL;
 	if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
 		return NULL;

 	return (struct smc_clc_smcd_v2_extension *)
 		((u8 *)prop_v2ext +
 		 offsetof(struct smc_clc_v2_extension, hdr) +
 		 offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
 		 sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
 		 ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
 }

 static inline struct smc_clc_first_contact_ext *
 smc_get_clc_first_contact_ext(struct smc_clc_msg_accept_confirm *clc,
 			      bool is_smcd)
 {
 	int clc_v2_len;

 	if (clc->hdr.version == SMC_V1 ||
 	    !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 		return NULL;

 	if (is_smcd)
 		clc_v2_len =
 			offsetofend(struct smc_clc_msg_accept_confirm, d1);
 	else
 		clc_v2_len =
 			offsetofend(struct smc_clc_msg_accept_confirm, r1);

 	return (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
 }

 struct smcd_dev;
 struct smc_init_info;

 int smc_clc_prfx_match(struct socket *clcsock,
 		       struct smc_clc_msg_proposal_prefix *prop);
 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 		     u8 expected_type, unsigned long timeout);
 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
 			 u8 version, u8 *eid, struct smc_init_info *ini);
 int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
 			u8 version, u8 *negotiated_eid, struct smc_init_info *ini);
 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
 				      struct smc_clc_msg_proposal *pclc,
 				      struct smc_init_info *ini);
 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
 				       struct smc_init_info *ini);
 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
 				       struct smc_init_info *ini);
 void smc_clc_init(void) __init;
 void smc_clc_exit(void);
 void smc_clc_get_hostname(u8 **host);
 bool smc_clc_match_eid(u8 *negotiated_eid,
 		       struct smc_clc_v2_extension *smc_v2_ext,
 		       u8 *peer_eid, u8 *local_eid);
 int smc_clc_ueid_count(void);
 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb);
 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info);
 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info);
 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info);
 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb);
 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info);
 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info);

 #endif
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	*
	* CLC (connection layer control) handshake over initial TCP socket to
	* prepare for RDMA traffic
	*
	* Copyright IBM Corp. 2016
	*
	* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
	*/

	#ifndef _SMC_CLC_H
	#define _SMC_CLC_H

	#include <rdma/ib_verbs.h>
	#include <linux/smc.h>

	#include "smc.h"
	#include "smc_netlink.h"

	#define SMC_CLC_PROPOSAL 0x01
	#define SMC_CLC_ACCEPT 0x02
	#define SMC_CLC_CONFIRM 0x03
	#define SMC_CLC_DECLINE 0x04

	#define SMC_TYPE_R 0 /* SMC-R only */
	#define SMC_TYPE_D 1 /* SMC-D only */
	#define SMC_TYPE_N 2 /* neither SMC-R nor SMC-D */
	#define SMC_TYPE_B 3 /* SMC-R and SMC-D */
	#define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */
	#define CLC_WAIT_TIME_SHORT HZ /* short wait time on clcsock */
	#define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */
	#define SMC_CLC_DECL_TIMEOUT_CL 0x02010000 /* timeout w4 QP confirm link */
	#define SMC_CLC_DECL_TIMEOUT_AL 0x02020000 /* timeout w4 QP add link */
	#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
	#define SMC_CLC_DECL_PEERNOSMC 0x03010000 /* peer did not indicate SMC */
	#define SMC_CLC_DECL_IPSEC 0x03020000 /* IPsec usage */
	#define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found (R or D) */
	#define SMC_CLC_DECL_NOSMCDDEV 0x03030001 /* no SMC-D device found */
	#define SMC_CLC_DECL_NOSMCRDEV 0x03030002 /* no SMC-R device found */
	#define SMC_CLC_DECL_NOISM2SUPP 0x03030003 /* hardware has no ISMv2 support */
	#define SMC_CLC_DECL_NOV2EXT 0x03030004 /* peer sent no clc v2 extension */
	#define SMC_CLC_DECL_NOV2DEXT 0x03030005 /* peer sent no clc SMC-Dv2 ext. */
	#define SMC_CLC_DECL_NOSEID 0x03030006 /* peer sent no SEID */
	#define SMC_CLC_DECL_NOSMCD2DEV 0x03030007 /* no SMC-Dv2 device found */
	#define SMC_CLC_DECL_NOUEID 0x03030008 /* peer sent no UEID */
	#define SMC_CLC_DECL_RELEASEERR 0x03030009 /* release version negotiate failed */
	#define SMC_CLC_DECL_MAXCONNERR 0x0303000a /* max connections negotiate failed */
	#define SMC_CLC_DECL_MAXLINKERR 0x0303000b /* max links negotiate failed */
	#define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/
	#define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */
	#define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */
	#define SMC_CLC_DECL_DIFFPREFIX 0x03070000 /* IP prefix / subnet mismatch */
	#define SMC_CLC_DECL_GETVLANERR 0x03080000 /* err to get vlan id of ip device*/
	#define SMC_CLC_DECL_ISMVLANERR 0x03090000 /* err to reg vlan id on ism dev */
	#define SMC_CLC_DECL_NOACTLINK 0x030a0000 /* no active smc-r link in lgr */
	#define SMC_CLC_DECL_NOSRVLINK 0x030b0000 /* SMC-R link from srv not found */
	#define SMC_CLC_DECL_VERSMISMAT 0x030c0000 /* SMC version mismatch */
	#define SMC_CLC_DECL_MAX_DMB 0x030d0000 /* SMC-D DMB limit exceeded */
	#define SMC_CLC_DECL_NOROUTE 0x030e0000 /* SMC-Rv2 conn. no route to peer */
	#define SMC_CLC_DECL_NOINDIRECT 0x030f0000 /* SMC-Rv2 conn. indirect mismatch*/
	#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */
	#define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */
	#define SMC_CLC_DECL_INTERR 0x09990000 /* internal error */
	#define SMC_CLC_DECL_ERR_RTOK 0x09990001 /* rtoken handling failed */
	#define SMC_CLC_DECL_ERR_RDYLNK 0x09990002 /* ib ready link failed */
	#define SMC_CLC_DECL_ERR_REGBUF 0x09990003 /* reg rdma bufs failed */

	#define SMC_FIRST_CONTACT_MASK 0b10 /* first contact bit within typev2 */

	struct smc_clc_msg_hdr { /* header1 of clc messages */
	u8 eyecatcher[4]; /* eye catcher */
	u8 type; /* proposal / accept / confirm / decline */
	__be16 length;
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 version : 4,
	typev2 : 2,
	typev1 : 2;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 typev1 : 2,
	typev2 : 2,
	version : 4;
	#endif
	} __packed; /* format defined in RFC7609 */

	struct smc_clc_msg_trail { /* trailer of clc messages */
	u8 eyecatcher[4];
	};

	struct smc_clc_msg_local { /* header2 of clc messages */
	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
	u8 gid[16]; /* gid of ib_device port */
	u8 mac[6]; /* mac of ib_device port */
	};

	/* Struct would be 4 byte aligned, but it is used in an array that is sent
	* to peers and must conform to RFC7609, hence we need to use packed here.
	*/
	struct smc_clc_ipv6_prefix {
	struct in6_addr prefix;
	u8 prefix_len;
	} __packed; /* format defined in RFC7609 */

	#if defined(__BIG_ENDIAN_BITFIELD)
	struct smc_clc_v2_flag {
	u8 release : 4,
	rsvd : 3,
	seid : 1;
	};
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	struct smc_clc_v2_flag {
	u8 seid : 1,
	rsvd : 3,
	release : 4;
	};
	#endif

	struct smc_clnt_opts_area_hdr {
	u8 eid_cnt; /* number of user defined EIDs */
	u8 ism_gid_cnt; /* number of ISMv2 GIDs */
	u8 reserved1;
	struct smc_clc_v2_flag flag;
	u8 reserved2[2];
	__be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
	};

	struct smc_clc_smcd_gid_chid {
	__be64 gid; /* ISM GID */
	__be16 chid; /* ISMv2 CHID */
	} __packed; /* format defined in
	* IBM Shared Memory Communications Version 2
	* (https://www.ibm.com/support/pages/node/6326337)
	*/

	struct smc_clc_v2_extension {
	/* New members must be added within the struct_group() macro below. */
	struct_group_tagged(smc_clc_v2_extension_fixed, fixed,
	struct smc_clnt_opts_area_hdr hdr;
	u8 roce[16]; /* RoCEv2 GID */
	u8 max_conns;
	u8 max_links;
	__be16 feature_mask;
	u8 reserved[12];
	);
	u8 user_eids[][SMC_MAX_EID_LEN];
	};
	static_assert(offsetof(struct smc_clc_v2_extension, user_eids) == sizeof(struct smc_clc_v2_extension_fixed),
	"struct member likely outside of struct_group_tagged()");

	struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/
	__be32 outgoing_subnet; /* subnet mask */
	u8 prefix_len; /* number of significant bits in mask */
	u8 reserved[2];
	u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */
	} __aligned(4);

	struct smc_clc_msg_smcd { /* SMC-D GID information */
	struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
	__be16 v2_ext_offset; /* SMC Version 2 Extension Offset */
	u8 vendor_oui[3]; /* vendor organizationally unique identifier */
	u8 vendor_exp_options[5];
	u8 reserved[20];
	};

	struct smc_clc_smcd_v2_extension {
	/* New members must be added within the struct_group() macro below. */
	struct_group_tagged(smc_clc_smcd_v2_extension_fixed, fixed,
	u8 system_eid[SMC_MAX_EID_LEN];
	u8 reserved[16];
	);
	struct smc_clc_smcd_gid_chid gidchid[];
	};
	static_assert(offsetof(struct smc_clc_smcd_v2_extension, gidchid) == sizeof(struct smc_clc_smcd_v2_extension_fixed),
	"struct member likely outside of struct_group_tagged()");

	struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */
	struct smc_clc_msg_hdr hdr;
	struct smc_clc_msg_local lcl;
	__be16 iparea_offset; /* offset to IP address information area */
	} __aligned(4);

	#define SMC_CLC_MAX_V6_PREFIX 8
	#define SMC_CLC_MAX_UEID 8
	#define SMCD_CLC_MAX_V2_GID_ENTRIES 8 /* max # of CHID-GID entries in CLC
	* proposal SMC-Dv2 extension.
	* each ISM device takes one entry and
	* each Emulated-ISM takes two entries
	*/

	struct smc_clc_msg_proposal_area {
	struct smc_clc_msg_proposal pclc_base;
	struct smc_clc_msg_smcd pclc_smcd;
	struct smc_clc_msg_proposal_prefix pclc_prfx;
	struct smc_clc_ipv6_prefix pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
	struct smc_clc_v2_extension_fixed pclc_v2_ext;
	u8 user_eids[SMC_CLC_MAX_UEID][SMC_MAX_EID_LEN];
	struct smc_clc_smcd_v2_extension_fixed pclc_smcd_v2_ext;
	struct smc_clc_smcd_gid_chid
	pclc_gidchids[SMCD_CLC_MAX_V2_GID_ENTRIES];
	struct smc_clc_msg_trail pclc_trl;
	};

	struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
	struct smc_clc_msg_local lcl;
	u8 qpn[3]; /* QP number */
	__be32 rmb_rkey; /* RMB rkey */
	u8 rmbe_idx; /* Index of RMBE in RMB */
	__be32 rmbe_alert_token; /* unique connection id */
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 rmbe_size : 4, /* buf size (compressed) */
	qp_mtu : 4; /* QP mtu */
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 qp_mtu : 4,
	rmbe_size : 4;
	#endif
	u8 reserved;
	__be64 rmb_dma_addr; /* RMB virtual address */
	u8 reserved2;
	u8 psn[3]; /* packet sequence number */
	} __packed;

	struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */
	__be64 gid; /* Sender GID */
	__be64 token; /* DMB token */
	u8 dmbe_idx; /* DMBE index */
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 dmbe_size : 4, /* buf size (compressed) */
	reserved3 : 4;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 reserved3 : 4,
	dmbe_size : 4;
	#endif
	u16 reserved4;
	__be32 linkid; /* Link identifier */
	} __packed;

	#define SMC_CLC_OS_ZOS 1
	#define SMC_CLC_OS_LINUX 2
	#define SMC_CLC_OS_AIX 3

	struct smc_clc_first_contact_ext {
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 v2_direct : 1,
	reserved : 7;
	u8 os_type : 4,
	release : 4;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 reserved : 7,
	v2_direct : 1;
	u8 release : 4,
	os_type : 4;
	#endif
	u8 reserved2[2];
	u8 hostname[SMC_MAX_HOSTNAME_LEN];
	};

	struct smc_clc_first_contact_ext_v2x {
	struct smc_clc_first_contact_ext fce_v2_base;
	union {
	struct {
	u8 max_conns; /* for SMC-R only */
	u8 max_links; /* for SMC-R only */
	};
	u8 reserved3[2]; /* for SMC-D only */
	};
	__be16 feature_mask;
	__be32 vendor_exp_options;
	u8 reserved4[8];
	} __packed; /* format defined in
	* IBM Shared Memory Communications Version 2 (Third Edition)
	* (https://www.ibm.com/support/pages/node/7009315)
	*/

	struct smc_clc_fce_gid_ext {
	u8 gid_cnt;
	u8 reserved2[3];
	u8 gid[][SMC_GID_SIZE];
	};

	struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
	struct smc_clc_msg_hdr hdr;
	union {
	struct { /* SMC-R */
	struct smcr_clc_msg_accept_confirm r0;
	struct { /* v2 only */
	u8 eid[SMC_MAX_EID_LEN];
	u8 reserved6[8];
	} __packed r1;
	};
	struct { /* SMC-D */
	struct smcd_clc_msg_accept_confirm_common d0;
	struct { /* v2 only, but 12 bytes reserved in v1 */
	__be16 chid;
	u8 eid[SMC_MAX_EID_LEN];
	__be64 gid_ext;
	} __packed d1;
	};
	};
	};

	struct smc_clc_msg_decline { /* clc decline message */
	struct smc_clc_msg_hdr hdr;
	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
	__be32 peer_diagnosis; /* diagnosis information */
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 os_type : 4,
	reserved : 4;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 reserved : 4,
	os_type : 4;
	#endif
	u8 reserved2[3];
	struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
	} __aligned(4);

	#define SMC_DECL_DIAG_COUNT_V2 4 /* no. of additional peer diagnosis codes */

	struct smc_clc_msg_decline_v2 { /* clc decline message */
	struct smc_clc_msg_hdr hdr;
	u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
	__be32 peer_diagnosis; /* diagnosis information */
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 os_type : 4,
	reserved : 4;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 reserved : 4,
	os_type : 4;
	#endif
	u8 reserved2[3];
	__be32 peer_diagnosis_v2[SMC_DECL_DIAG_COUNT_V2];
	struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
	} __aligned(4);

	/* determine start of the prefix area within the proposal message */
	static inline struct smc_clc_msg_proposal_prefix *
	smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
	{
	return (struct smc_clc_msg_proposal_prefix *)
	((u8 )pclc + sizeof(pclc) + ntohs(pclc->iparea_offset));
	}

	static inline bool smcr_indicated(int smc_type)
	{
	return smc_type == SMC_TYPE_R \|\| smc_type == SMC_TYPE_B;
	}

	static inline bool smcd_indicated(int smc_type)
	{
	return smc_type == SMC_TYPE_D \|\| smc_type == SMC_TYPE_B;
	}

	static inline u8 smc_indicated_type(int is_smcd, int is_smcr)
	{
	if (is_smcd && is_smcr)
	return SMC_TYPE_B;
	if (is_smcd)
	return SMC_TYPE_D;
	if (is_smcr)
	return SMC_TYPE_R;
	return SMC_TYPE_N;
	}

	/* get SMC-D info from proposal message */
	static inline struct smc_clc_msg_smcd *
	smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
	{
	if (smcd_indicated(prop->hdr.typev1) &&
	ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
	return NULL;

	return (struct smc_clc_msg_smcd *)(prop + 1);
	}

	static inline struct smc_clc_v2_extension *
	smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
	{
	struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);

	if (!prop_smcd \|\| !ntohs(prop_smcd->v2_ext_offset))
	return NULL;

	return (struct smc_clc_v2_extension *)
	((u8 *)prop_smcd +
	offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
	sizeof(prop_smcd->v2_ext_offset) +
	ntohs(prop_smcd->v2_ext_offset));
	}

	static inline struct smc_clc_smcd_v2_extension *
	smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
	{
	if (!prop_v2ext)
	return NULL;
	if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
	return NULL;

	return (struct smc_clc_smcd_v2_extension *)
	((u8 *)prop_v2ext +
	offsetof(struct smc_clc_v2_extension, hdr) +
	offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
	sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
	ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
	}

	static inline struct smc_clc_first_contact_ext *
	smc_get_clc_first_contact_ext(struct smc_clc_msg_accept_confirm *clc,
	bool is_smcd)
	{
	int clc_v2_len;

	if (clc->hdr.version == SMC_V1 \|\|
	!(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
	return NULL;

	if (is_smcd)
	clc_v2_len =
	offsetofend(struct smc_clc_msg_accept_confirm, d1);
	else
	clc_v2_len =
	offsetofend(struct smc_clc_msg_accept_confirm, r1);

	return (struct smc_clc_first_contact_ext )(((u8 )clc) + clc_v2_len);
	}

	struct smcd_dev;
	struct smc_init_info;

	int smc_clc_prfx_match(struct socket *clcsock,
	struct smc_clc_msg_proposal_prefix *prop);
	int smc_clc_wait_msg(struct smc_sock smc, void buf, int buflen,
	u8 expected_type, unsigned long timeout);
	int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
	int smc_clc_send_proposal(struct smc_sock smc, struct smc_init_info ini);
	int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
	u8 version, u8 eid, struct smc_init_info ini);
	int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
	u8 version, u8 negotiated_eid, struct smc_init_info ini);
	int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
	struct smc_clc_msg_proposal *pclc,
	struct smc_init_info *ini);
	int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
	struct smc_init_info *ini);
	int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
	struct smc_init_info *ini);
	void smc_clc_init(void) __init;
	void smc_clc_exit(void);
	void smc_clc_get_hostname(u8 **host);
	bool smc_clc_match_eid(u8 *negotiated_eid,
	struct smc_clc_v2_extension *smc_v2_ext,
	u8 peer_eid, u8 local_eid);
	int smc_clc_ueid_count(void);
	int smc_nl_dump_ueid(struct sk_buff skb, struct netlink_callback cb);
	int smc_nl_add_ueid(struct sk_buff skb, struct genl_info info);
	int smc_nl_remove_ueid(struct sk_buff skb, struct genl_info info);
	int smc_nl_flush_ueid(struct sk_buff skb, struct genl_info info);
	int smc_nl_dump_seid(struct sk_buff skb, struct netlink_callback cb);
	int smc_nl_enable_seid(struct sk_buff skb, struct genl_info info);
	int smc_nl_disable_seid(struct sk_buff skb, struct genl_info info);

	#endif