include/uapi/scsi/scsi_netlink.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *  SCSI Transport Netlink Interface
   4  *    Used for the posting of outbound SCSI transport events
   5  *
   6  *  Copyright (C) 2006   James Smart, Emulex Corporation
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23 #ifndef SCSI_NETLINK_H
  24 #define SCSI_NETLINK_H
  25
  26 #include <linux/netlink.h>
  27 #include <linux/types.h>
  28
  29 /*
  30  * This file intended to be included by both kernel and user space
  31  */
  32
  33 /* Single Netlink Message type to send all SCSI Transport messages */
  34 #define SCSI_TRANSPORT_MSG              NLMSG_MIN_TYPE + 1
  35
  36 /* SCSI Transport Broadcast Groups */
  37         /* leaving groups 0 and 1 unassigned */
  38 #define SCSI_NL_GRP_FC_EVENTS           (1<<2)          /* Group 2 */
  39 #define SCSI_NL_GRP_CNT                 3
  40
  41
  42 /* SCSI_TRANSPORT_MSG event message header */
  43 struct scsi_nl_hdr {
  44         uint8_t version;
  45         uint8_t transport;
  46         uint16_t magic;
  47         uint16_t msgtype;
  48         uint16_t msglen;
  49 } __attribute__((aligned(sizeof(uint64_t))));
  50
  51 /* scsi_nl_hdr->version value */
  52 #define SCSI_NL_VERSION                         1
  53
  54 /* scsi_nl_hdr->magic value */
  55 #define SCSI_NL_MAGIC                           0xA1B2
  56
  57 /* scsi_nl_hdr->transport value */
  58 #define SCSI_NL_TRANSPORT                       0
  59 #define SCSI_NL_TRANSPORT_FC                    1
  60 #define SCSI_NL_MAX_TRANSPORTS                  2
  61
  62 /* Transport-based scsi_nl_hdr->msgtype values are defined in each transport */
  63
  64 /*
  65  * GENERIC SCSI scsi_nl_hdr->msgtype Values
  66  */
  67         /* kernel -> user */
  68 #define SCSI_NL_SHOST_VENDOR                    0x0001
  69         /* user -> kernel */
  70 /* SCSI_NL_SHOST_VENDOR msgtype is kernel->user and user->kernel */
  71
  72
  73 /*
  74  * Message Structures :
  75  */
  76
  77 /* macro to round up message lengths to 8byte boundary */
  78 #define SCSI_NL_MSGALIGN(len)           (((len) + 7) & ~7)
  79
  80
  81 /*
  82  * SCSI HOST Vendor Unique messages :
  83  *   SCSI_NL_SHOST_VENDOR
  84  *
  85  * Note: The Vendor Unique message payload will begin directly after
  86  *       this structure, with the length of the payload per vmsg_datalen.
  87  *
  88  * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
  89  *   formatting requirements specified below
  90  */
  91 struct scsi_nl_host_vendor_msg {
  92         struct scsi_nl_hdr snlh;                /* must be 1st element ! */
  93         uint64_t vendor_id;
  94         uint16_t host_no;
  95         uint16_t vmsg_datalen;
  96 } __attribute__((aligned(sizeof(uint64_t))));
  97
  98
  99 /*
 100  * Vendor ID:
 101  *   If transports post vendor-unique events, they must pass a well-known
 102  *   32-bit vendor identifier. This identifier consists of 8 bits indicating
 103  *   the "type" of identifier contained, and 24 bits of id data.
 104  *
 105  *   Identifiers for each type:
 106  *    PCI :  ID data is the 16 bit PCI Registered Vendor ID
 107  */
 108 #define SCSI_NL_VID_TYPE_SHIFT          56
 109 #define SCSI_NL_VID_TYPE_MASK           ((__u64)0xFF << SCSI_NL_VID_TYPE_SHIFT)
 110 #define SCSI_NL_VID_TYPE_PCI            ((__u64)0x01 << SCSI_NL_VID_TYPE_SHIFT)
 111 #define SCSI_NL_VID_ID_MASK             (~ SCSI_NL_VID_TYPE_MASK)
 112
 113
 114 #define INIT_SCSI_NL_HDR(hdr, t, mtype, mlen)                   \
 115         {                                                       \
 116         (hdr)->version = SCSI_NL_VERSION;                       \
 117         (hdr)->transport = t;                                   \
 118         (hdr)->magic = SCSI_NL_MAGIC;                           \
 119         (hdr)->msgtype = mtype;                                 \
 120         (hdr)->msglen = mlen;                                   \
 121         }
 122
 123 #endif /* SCSI_NETLINK_H */
 124