include/scsi/scsi_netlink.h

   1 /*
   2  *  SCSI Transport Netlink Interface
   3  *    Used for the posting of outbound SCSI transport events
   4  *
   5  *  Copyright (C) 2006   James Smart, Emulex Corporation
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22 #ifndef SCSI_NETLINK_H
  23 #define SCSI_NETLINK_H
  24
  25 #include <linux/netlink.h>
  26
  27
  28 /*
  29  * This file intended to be included by both kernel and user space
  30  */
  31
  32 /* Single Netlink Message type to send all SCSI Transport messages */
  33 #define SCSI_TRANSPORT_MSG              NLMSG_MIN_TYPE + 1
  34
  35 /* SCSI Transport Broadcast Groups */
  36         /* leaving groups 0 and 1 unassigned */
  37 #define SCSI_NL_GRP_FC_EVENTS           (1<<2)          /* Group 2 */
  38 #define SCSI_NL_GRP_CNT                 3
  39
  40
  41 /* SCSI_TRANSPORT_MSG event message header */
  42 struct scsi_nl_hdr {
  43         uint8_t version;
  44         uint8_t transport;
  45         uint16_t magic;
  46         uint16_t msgtype;
  47         uint16_t msglen;
  48 } __attribute__((aligned(sizeof(uint64_t))));
  49
  50 /* scsi_nl_hdr->version value */
  51 #define SCSI_NL_VERSION                         1
  52
  53 /* scsi_nl_hdr->magic value */
  54 #define SCSI_NL_MAGIC                           0xA1B2
  55
  56 /* scsi_nl_hdr->transport value */
  57 #define SCSI_NL_TRANSPORT                       0
  58 #define SCSI_NL_TRANSPORT_FC                    1
  59 #define SCSI_NL_MAX_TRANSPORTS                  2
  60
  61 /* Transport-based scsi_nl_hdr->msgtype values are defined in each transport */
  62
  63 /*
  64  * GENERIC SCSI scsi_nl_hdr->msgtype Values
  65  */
  66         /* kernel -> user */
  67 #define SCSI_NL_SHOST_VENDOR                    0x0001
  68         /* user -> kernel */
  69 /* SCSI_NL_SHOST_VENDOR msgtype is kernel->user and user->kernel */
  70
  71
  72 /*
  73  * Message Structures :
  74  */
  75
  76 /* macro to round up message lengths to 8byte boundary */
  77 #define SCSI_NL_MSGALIGN(len)           (((len) + 7) & ~7)
  78
  79
  80 /*
  81  * SCSI HOST Vendor Unique messages :
  82  *   SCSI_NL_SHOST_VENDOR
  83  *
  84  * Note: The Vendor Unique message payload will begin directly after
  85  *       this structure, with the length of the payload per vmsg_datalen.
  86  *
  87  * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
  88  *   formatting requirements specified below
  89  */
  90 struct scsi_nl_host_vendor_msg {
  91         struct scsi_nl_hdr snlh;                /* must be 1st element ! */
  92         uint64_t vendor_id;
  93         uint16_t host_no;
  94         uint16_t vmsg_datalen;
  95 } __attribute__((aligned(sizeof(uint64_t))));
  96
  97
  98 /*
  99  * Vendor ID:
 100  *   If transports post vendor-unique events, they must pass a well-known
 101  *   32-bit vendor identifier. This identifier consists of 8 bits indicating
 102  *   the "type" of identifier contained, and 24 bits of id data.
 103  *
 104  *   Identifiers for each type:
 105  *    PCI :  ID data is the 16 bit PCI Registered Vendor ID
 106  */
 107 #define SCSI_NL_VID_TYPE_SHIFT          56
 108 #define SCSI_NL_VID_TYPE_MASK           ((u64)0xFF << SCSI_NL_VID_TYPE_SHIFT)
 109 #define SCSI_NL_VID_TYPE_PCI            ((u64)0x01 << SCSI_NL_VID_TYPE_SHIFT)
 110 #define SCSI_NL_VID_ID_MASK             (~ SCSI_NL_VID_TYPE_MASK)
 111
 112
 113 #define INIT_SCSI_NL_HDR(hdr, t, mtype, mlen)                   \
 114         {                                                       \
 115         (hdr)->version = SCSI_NL_VERSION;                       \
 116         (hdr)->transport = t;                                   \
 117         (hdr)->magic = SCSI_NL_MAGIC;                           \
 118         (hdr)->msgtype = mtype;                                 \
 119         (hdr)->msglen = mlen;                                   \
 120         }
 121
 122
 123 #ifdef __KERNEL__
 124
 125 #include <scsi/scsi_host.h>
 126
 127 /* Exported Kernel Interfaces */
 128 int scsi_nl_add_transport(u8 tport,
 129          int (*msg_handler)(struct sk_buff *),
 130         void (*event_handler)(struct notifier_block *, unsigned long, void *));
 131 void scsi_nl_remove_transport(u8 tport);
 132
 133 int scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt,
 134         int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload,
 135                                  u32 len, u32 pid),
 136         void (*nlevt_handler)(struct notifier_block *nb,
 137                                  unsigned long event, void *notify_ptr));
 138 void scsi_nl_remove_driver(u64 vendor_id);
 139
 140 void scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr);
 141 int scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id,
 142                          char *data_buf, u32 data_len);
 143
 144 #endif /* __KERNEL__ */
 145
 146 #endif /* SCSI_NETLINK_H */
 147