22447be7d1
This patch adds scsi netlink recieve and event support for transport and scsi LLDD's. It is a reimplementation of the patch posted last week by David Somayajulu. http://marc.info/?l=linux-scsi&m=121745486221819&w=2 There are a few things done differently: - Transport support is included - Event delivery is included - The vendor message is now its own unique message type, considered part of the generic "SCSI Transport". - LLDD entry points are now registered rather than included in the scsi_host_template. Background: When I started to implement the event handler via template, I had to either: muck up scsi_add_host and scsi_remove_host; or have the event handler search all possible shosts. Neither was acceptable. Moving to a registration solves this, and also limits the scope of the changes to something that could be backported to a distro without breaking an already-released-distro kabi. However, I admit it isn't as elegant, as the passing of the LLDD host template in the registration and the complexity around dynamic add/remove shows. - The receive path was augmented to require a unique identifier for the LLDD before the message was allowed to be handed off to the driver. Given how quickly very fatal errors occur if there's msg mismatches (which I saw in testing my own tools :), I believe this to be a very good thing. The id plays off the vendor id scheme already introduced for the vendor unique event messages used by FC. Additionally, the id use as the basis of the registration/deregistration. - Send assist functions, for both the transport and LLDDs are included. [fujita.tomonori@lab.ntt.co.jp: fix missing cast] Signed-off-by: James Smart <james.smart@emulex.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
148 lines
4.2 KiB
C
148 lines
4.2 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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