148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
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* SCSI Transport Netlink Interface
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* Used for the posting of outbound SCSI transport events
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*
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* Copyright (C) 2006 James Smart, Emulex Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef SCSI_NETLINK_H
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#define SCSI_NETLINK_H
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#include <linux/netlink.h>
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/*
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* This file intended to be included by both kernel and user space
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*/
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/* Single Netlink Message type to send all SCSI Transport messages */
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#define SCSI_TRANSPORT_MSG NLMSG_MIN_TYPE + 1
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/* SCSI Transport Broadcast Groups */
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/* leaving groups 0 and 1 unassigned */
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#define SCSI_NL_GRP_FC_EVENTS (1<<2) /* Group 2 */
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#define SCSI_NL_GRP_CNT 3
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/* SCSI_TRANSPORT_MSG event message header */
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struct scsi_nl_hdr {
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uint8_t version;
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uint8_t transport;
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uint16_t magic;
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uint16_t msgtype;
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uint16_t msglen;
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} __attribute__((aligned(sizeof(uint64_t))));
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/* scsi_nl_hdr->version value */
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#define SCSI_NL_VERSION 1
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/* scsi_nl_hdr->magic value */
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#define SCSI_NL_MAGIC 0xA1B2
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/* scsi_nl_hdr->transport value */
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#define SCSI_NL_TRANSPORT 0
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#define SCSI_NL_TRANSPORT_FC 1
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#define SCSI_NL_MAX_TRANSPORTS 2
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/* Transport-based scsi_nl_hdr->msgtype values are defined in each transport */
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/*
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* GENERIC SCSI scsi_nl_hdr->msgtype Values
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*/
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/* kernel -> user */
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#define SCSI_NL_SHOST_VENDOR 0x0001
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/* user -> kernel */
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/* SCSI_NL_SHOST_VENDOR msgtype is kernel->user and user->kernel */
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/*
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* Message Structures :
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*/
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/* macro to round up message lengths to 8byte boundary */
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#define SCSI_NL_MSGALIGN(len) (((len) + 7) & ~7)
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/*
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* SCSI HOST Vendor Unique messages :
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* SCSI_NL_SHOST_VENDOR
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*
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* Note: The Vendor Unique message payload will begin directly after
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* this structure, with the length of the payload per vmsg_datalen.
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*
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* Note: When specifying vendor_id, be sure to read the Vendor Type and ID
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* formatting requirements specified below
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*/
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struct scsi_nl_host_vendor_msg {
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struct scsi_nl_hdr snlh; /* must be 1st element ! */
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uint64_t vendor_id;
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uint16_t host_no;
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uint16_t vmsg_datalen;
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} __attribute__((aligned(sizeof(uint64_t))));
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/*
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* Vendor ID:
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* If transports post vendor-unique events, they must pass a well-known
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* 32-bit vendor identifier. This identifier consists of 8 bits indicating
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* the "type" of identifier contained, and 24 bits of id data.
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*
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* Identifiers for each type:
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* PCI : ID data is the 16 bit PCI Registered Vendor ID
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*/
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#define SCSI_NL_VID_TYPE_SHIFT 56
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#define SCSI_NL_VID_TYPE_MASK ((__u64)0xFF << SCSI_NL_VID_TYPE_SHIFT)
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#define SCSI_NL_VID_TYPE_PCI ((__u64)0x01 << SCSI_NL_VID_TYPE_SHIFT)
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#define SCSI_NL_VID_ID_MASK (~ SCSI_NL_VID_TYPE_MASK)
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#define INIT_SCSI_NL_HDR(hdr, t, mtype, mlen) \
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{ \
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(hdr)->version = SCSI_NL_VERSION; \
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(hdr)->transport = t; \
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(hdr)->magic = SCSI_NL_MAGIC; \
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(hdr)->msgtype = mtype; \
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(hdr)->msglen = mlen; \
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}
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#ifdef __KERNEL__
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#include <scsi/scsi_host.h>
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/* Exported Kernel Interfaces */
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int scsi_nl_add_transport(u8 tport,
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int (*msg_handler)(struct sk_buff *),
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void (*event_handler)(struct notifier_block *, unsigned long, void *));
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void scsi_nl_remove_transport(u8 tport);
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int scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt,
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int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload,
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u32 len, u32 pid),
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void (*nlevt_handler)(struct notifier_block *nb,
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unsigned long event, void *notify_ptr));
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void scsi_nl_remove_driver(u64 vendor_id);
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void scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr);
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int scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id,
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char *data_buf, u32 data_len);
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#endif /* __KERNEL__ */
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#endif /* SCSI_NETLINK_H */
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