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9e4f5e2961
Attached is the ELS/CT pass-thru patch for the FC Transport. The patch
creates a generic framework that lays on top of bsg and the SGIO v4 ioctl
in order to pass transaction requests to LLDD's.
The interface supports the following operations:
On an fc_host basis:
Request login to the specified N_Port_ID, creating an fc_rport.
Request logout of the specified N_Port_ID, deleting an fc_rport
Send ELS request to specified N_Port_ID w/o requiring a login, and
wait for ELS response.
Send CT request to specified N_Port_ID and wait for CT response.
Login is required, but LLDD is allowed to manage login and decide
whether it stays in place after the request is satisfied.
Vendor-Unique request. Allows a LLDD-specific request to be passed
to the LLDD, and the passing of a response back to the application.
On an fc_rport basis:
Send ELS request to nport and wait for ELS response.
Send CT request to nport and wait for CT response.
The patch also exports several headers from include/scsi such that
they can be available to user-space applications:
include/scsi/scsi.h
include/scsi/scsi_netlink.h
include/scsi/scsi_netlink_fc.h
include/scsi/scsi_bsg_fc.h
For further information, refer to the last RFC:
http://marc.info/?l=linux-scsi&m=123436574018579&w=2
Note: Documentation is still spotty and will be added later.
[bharrosh@panasas.com: update for new block API]
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
322 lines
8.5 KiB
C
322 lines
8.5 KiB
C
/*
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* FC Transport BSG Interface
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*
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* Copyright (C) 2008 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_BSG_FC_H
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#define SCSI_BSG_FC_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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#include <scsi/scsi.h>
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/*
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* FC Transport SGIO v4 BSG Message Support
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*/
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/* Default BSG request timeout (in seconds) */
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#define FC_DEFAULT_BSG_TIMEOUT (10 * HZ)
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/*
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* Request Message Codes supported by the FC Transport
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*/
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/* define the class masks for the message codes */
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#define FC_BSG_CLS_MASK 0xF0000000 /* find object class */
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#define FC_BSG_HST_MASK 0x80000000 /* fc host class */
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#define FC_BSG_RPT_MASK 0x40000000 /* fc rport class */
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/* fc_host Message Codes */
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#define FC_BSG_HST_ADD_RPORT (FC_BSG_HST_MASK | 0x00000001)
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#define FC_BSG_HST_DEL_RPORT (FC_BSG_HST_MASK | 0x00000002)
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#define FC_BSG_HST_ELS_NOLOGIN (FC_BSG_HST_MASK | 0x00000003)
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#define FC_BSG_HST_CT (FC_BSG_HST_MASK | 0x00000004)
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#define FC_BSG_HST_VENDOR (FC_BSG_HST_MASK | 0x000000FF)
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/* fc_rport Message Codes */
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#define FC_BSG_RPT_ELS (FC_BSG_RPT_MASK | 0x00000001)
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#define FC_BSG_RPT_CT (FC_BSG_RPT_MASK | 0x00000002)
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/*
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* FC Address Identifiers in Message Structures :
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*
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* Whenever a command payload contains a FC Address Identifier
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* (aka port_id), the value is effectively in big-endian
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* order, thus the array elements are decoded as follows:
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* element [0] is bits 23:16 of the FC Address Identifier
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* element [1] is bits 15:8 of the FC Address Identifier
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* element [2] is bits 7:0 of the FC Address Identifier
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*/
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/*
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* FC Host Messages
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*/
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/* FC_BSG_HST_ADDR_PORT : */
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/* Request:
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* This message requests the FC host to login to the remote port
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* at the specified N_Port_Id. The remote port is to be enumerated
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* with the transport upon completion of the login.
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*/
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struct fc_bsg_host_add_rport {
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uint8_t reserved;
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/* FC Address Identier of the remote port to login to */
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uint8_t port_id[3];
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};
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/* Response:
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* There is no additional response data - fc_bsg_reply->result is sufficient
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*/
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/* FC_BSG_HST_DEL_RPORT : */
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/* Request:
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* This message requests the FC host to remove an enumerated
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* remote port and to terminate the login to it.
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*
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* Note: The driver is free to reject this request if it desires to
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* remain logged in with the remote port.
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*/
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struct fc_bsg_host_del_rport {
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uint8_t reserved;
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/* FC Address Identier of the remote port to logout of */
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uint8_t port_id[3];
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};
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/* Response:
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* There is no additional response data - fc_bsg_reply->result is sufficient
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*/
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/* FC_BSG_HST_ELS_NOLOGIN : */
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/* Request:
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* This message requests the FC_Host to send an ELS to a specific
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* N_Port_ID. The host does not need to log into the remote port,
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* nor does it need to enumerate the rport for further traffic
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* (although, the FC host is free to do so if it desires).
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*/
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struct fc_bsg_host_els {
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/*
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* ELS Command Code being sent (must be the same as byte 0
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* of the payload)
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*/
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uint8_t command_code;
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/* FC Address Identier of the remote port to send the ELS to */
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uint8_t port_id[3];
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};
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/* Response:
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*/
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/* fc_bsg_ctels_reply->status values */
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#define FC_CTELS_STATUS_OK 0x00000000
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#define FC_CTELS_STATUS_REJECT 0x00000001
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#define FC_CTELS_STATUS_P_RJT 0x00000002
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#define FC_CTELS_STATUS_F_RJT 0x00000003
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#define FC_CTELS_STATUS_P_BSY 0x00000004
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#define FC_CTELS_STATUS_F_BSY 0x00000006
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struct fc_bsg_ctels_reply {
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/*
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* Note: An ELS LS_RJT may be reported in 2 ways:
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* a) A status of FC_CTELS_STATUS_OK is returned. The caller
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* is to look into the ELS receive payload to determine
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* LS_ACC or LS_RJT (by contents of word 0). The reject
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* data will be in word 1.
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* b) A status of FC_CTELS_STATUS_REJECT is returned, The
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* rjt_data field will contain valid data.
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*
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* Note: ELS LS_ACC is determined by an FC_CTELS_STATUS_OK, and
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* the receive payload word 0 indicates LS_ACC
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* (e.g. value is 0x02xxxxxx).
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*
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* Note: Similarly, a CT Reject may be reported in 2 ways:
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* a) A status of FC_CTELS_STATUS_OK is returned. The caller
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* is to look into the CT receive payload to determine
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* Accept or Reject (by contents of word 2). The reject
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* data will be in word 3.
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* b) A status of FC_CTELS_STATUS_REJECT is returned, The
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* rjt_data field will contain valid data.
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*
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* Note: x_RJT/BSY status will indicae that the rjt_data field
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* is valid and contains the reason/explanation values.
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*/
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uint32_t status; /* See FC_CTELS_STATUS_xxx */
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/* valid if status is not FC_CTELS_STATUS_OK */
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struct {
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uint8_t action; /* fragment_id for CT REJECT */
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uint8_t reason_code;
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uint8_t reason_explanation;
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uint8_t vendor_unique;
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} rjt_data;
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};
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/* FC_BSG_HST_CT : */
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/* Request:
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* This message requests that a CT Request be performed with the
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* indicated N_Port_ID. The driver is responsible for logging in with
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* the fabric and/or N_Port_ID, etc as per FC rules. This request does
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* not mandate that the driver must enumerate the destination in the
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* transport. The driver is allowed to decide whether to enumerate it,
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* and whether to tear it down after the request.
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*/
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struct fc_bsg_host_ct {
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uint8_t reserved;
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/* FC Address Identier of the remote port to send the ELS to */
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uint8_t port_id[3];
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/*
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* We need words 0-2 of the generic preamble for the LLD's
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*/
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uint32_t preamble_word0; /* revision & IN_ID */
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uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
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uint32_t preamble_word2; /* Cmd Code, Max Size */
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};
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/* Response:
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*
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* The reply structure is an fc_bsg_ctels_reply structure
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*/
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/* FC_BSG_HST_VENDOR : */
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/* Request:
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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 in scsi_netlink.h
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*/
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struct fc_bsg_host_vendor {
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/*
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* Identifies the vendor that the message is formatted for. This
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* should be the recipient of the message.
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*/
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uint64_t vendor_id;
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/* start of vendor command area */
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uint32_t vendor_cmd[0];
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};
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/* Response:
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*/
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struct fc_bsg_host_vendor_reply {
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/* start of vendor response area */
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uint32_t vendor_rsp[0];
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};
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/*
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* FC Remote Port Messages
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*/
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/* FC_BSG_RPT_ELS : */
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/* Request:
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* This message requests that an ELS be performed with the rport.
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*/
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struct fc_bsg_rport_els {
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/*
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* ELS Command Code being sent (must be the same as
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* byte 0 of the payload)
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*/
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uint8_t els_code;
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};
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/* Response:
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*
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* The reply structure is an fc_bsg_ctels_reply structure
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*/
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/* FC_BSG_RPT_CT : */
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/* Request:
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* This message requests that a CT Request be performed with the rport.
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*/
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struct fc_bsg_rport_ct {
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/*
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* We need words 0-2 of the generic preamble for the LLD's
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*/
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uint32_t preamble_word0; /* revision & IN_ID */
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uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
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uint32_t preamble_word2; /* Cmd Code, Max Size */
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};
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/* Response:
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*
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* The reply structure is an fc_bsg_ctels_reply structure
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*/
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/* request (CDB) structure of the sg_io_v4 */
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struct fc_bsg_request {
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uint32_t msgcode;
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union {
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struct fc_bsg_host_add_rport h_addrport;
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struct fc_bsg_host_del_rport h_delrport;
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struct fc_bsg_host_els h_els;
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struct fc_bsg_host_ct h_ct;
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struct fc_bsg_host_vendor h_vendor;
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struct fc_bsg_rport_els r_els;
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struct fc_bsg_rport_ct r_ct;
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} rqst_data;
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};
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/* response (request sense data) structure of the sg_io_v4 */
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struct fc_bsg_reply {
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/*
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* The completion result. Result exists in two forms:
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* if negative, it is an -Exxx system errno value. There will
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* be no further reply information supplied.
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* else, it's the 4-byte scsi error result, with driver, host,
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* msg and status fields. The per-msgcode reply structure
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* will contain valid data.
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*/
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uint32_t result;
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/* If there was reply_payload, how much was recevied ? */
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uint32_t reply_payload_rcv_len;
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union {
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struct fc_bsg_host_vendor_reply vendor_reply;
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struct fc_bsg_ctels_reply ctels_reply;
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} reply_data;
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};
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#endif /* SCSI_BSG_FC_H */
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