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linux-sg2042/drivers/scsi/fnic/fcpio.h

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[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA fnic is a driver for the Cisco PCI-Express FCoE HBA Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com> Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-04-18 09:33:26 +08:00
/*
* Copyright 2008 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _FCPIO_H_
#define _FCPIO_H_
#include <linux/if_ether.h>
/*
* This header file includes all of the data structures used for
* communication by the host driver to the fcp firmware.
*/
/*
* Exchange and sequence id space allocated to the host driver
*/
#define FCPIO_HOST_EXCH_RANGE_START 0x1000
#define FCPIO_HOST_EXCH_RANGE_END 0x1fff
#define FCPIO_HOST_SEQ_ID_RANGE_START 0x80
#define FCPIO_HOST_SEQ_ID_RANGE_END 0xff
/*
* Command entry type
*/
enum fcpio_type {
/*
* Initiator request types
*/
FCPIO_ICMND_16 = 0x1,
FCPIO_ICMND_32,
FCPIO_ICMND_CMPL,
FCPIO_ITMF,
FCPIO_ITMF_CMPL,
/*
* Target request types
*/
FCPIO_TCMND_16 = 0x11,
FCPIO_TCMND_32,
FCPIO_TDATA,
FCPIO_TXRDY,
FCPIO_TRSP,
FCPIO_TDRSP_CMPL,
FCPIO_TTMF,
FCPIO_TTMF_ACK,
FCPIO_TABORT,
FCPIO_TABORT_CMPL,
/*
* Misc request types
*/
FCPIO_ACK = 0x20,
FCPIO_RESET,
FCPIO_RESET_CMPL,
FCPIO_FLOGI_REG,
FCPIO_FLOGI_REG_CMPL,
FCPIO_ECHO,
FCPIO_ECHO_CMPL,
FCPIO_LUNMAP_CHNG,
FCPIO_LUNMAP_REQ,
FCPIO_LUNMAP_REQ_CMPL,
FCPIO_FLOGI_FIP_REG,
FCPIO_FLOGI_FIP_REG_CMPL,
};
/*
* Header status codes from the firmware
*/
enum fcpio_status {
FCPIO_SUCCESS = 0, /* request was successful */
/*
* If a request to the firmware is rejected, the original request
* header will be returned with the status set to one of the following:
*/
FCPIO_INVALID_HEADER, /* header contains invalid data */
FCPIO_OUT_OF_RESOURCE, /* out of resources to complete request */
FCPIO_INVALID_PARAM, /* some parameter in request is invalid */
FCPIO_REQ_NOT_SUPPORTED, /* request type is not supported */
FCPIO_IO_NOT_FOUND, /* requested I/O was not found */
/*
* Once a request is processed, the firmware will usually return
* a cmpl message type. In cases where errors occurred,
* the header status field would be filled in with one of the following:
*/
FCPIO_ABORTED = 0x41, /* request was aborted */
FCPIO_TIMEOUT, /* request was timed out */
FCPIO_SGL_INVALID, /* request was aborted due to sgl error */
FCPIO_MSS_INVALID, /* request was aborted due to mss error */
FCPIO_DATA_CNT_MISMATCH, /* recv/sent more/less data than exp. */
FCPIO_FW_ERR, /* request was terminated due to fw error */
FCPIO_ITMF_REJECTED, /* itmf req was rejected by remote node */
FCPIO_ITMF_FAILED, /* itmf req was failed by remote node */
FCPIO_ITMF_INCORRECT_LUN, /* itmf req targeted incorrect LUN */
FCPIO_CMND_REJECTED, /* request was invalid and rejected */
FCPIO_NO_PATH_AVAIL, /* no paths to the lun was available */
FCPIO_PATH_FAILED, /* i/o sent to current path failed */
FCPIO_LUNMAP_CHNG_PEND, /* i/o rejected due to lunmap change */
};
/*
* The header command tag. All host requests will use the "tag" field
* to mark commands with a unique tag. When the firmware responds to
* a host request, it will copy the tag field into the response.
*
* The only firmware requests that will use the rx_id/ox_id fields instead
* of the tag field will be the target command and target task management
* requests. These two requests do not have corresponding host requests
* since they come directly from the FC initiator on the network.
*/
struct fcpio_tag {
union {
u32 req_id;
struct {
u16 rx_id;
u16 ox_id;
} ex_id;
} u;
};
static inline void
fcpio_tag_id_enc(struct fcpio_tag *tag, u32 id)
{
tag->u.req_id = id;
}
static inline void
fcpio_tag_id_dec(struct fcpio_tag *tag, u32 *id)
{
*id = tag->u.req_id;
}
static inline void
fcpio_tag_exid_enc(struct fcpio_tag *tag, u16 ox_id, u16 rx_id)
{
tag->u.ex_id.rx_id = rx_id;
tag->u.ex_id.ox_id = ox_id;
}
static inline void
fcpio_tag_exid_dec(struct fcpio_tag *tag, u16 *ox_id, u16 *rx_id)
{
*rx_id = tag->u.ex_id.rx_id;
*ox_id = tag->u.ex_id.ox_id;
}
/*
* The header for an fcpio request, whether from the firmware or from the
* host driver
*/
struct fcpio_header {
u8 type; /* enum fcpio_type */
u8 status; /* header status entry */
u16 _resvd; /* reserved */
struct fcpio_tag tag; /* header tag */
};
static inline void
fcpio_header_enc(struct fcpio_header *hdr,
u8 type, u8 status,
struct fcpio_tag tag)
{
hdr->type = type;
hdr->status = status;
hdr->_resvd = 0;
hdr->tag = tag;
}
static inline void
fcpio_header_dec(struct fcpio_header *hdr,
u8 *type, u8 *status,
struct fcpio_tag *tag)
{
*type = hdr->type;
*status = hdr->status;
*tag = hdr->tag;
}
#define CDB_16 16
#define CDB_32 32
#define LUN_ADDRESS 8
/*
* fcpio_icmnd_16: host -> firmware request
*
* used for sending out an initiator SCSI 16-byte command
*/
struct fcpio_icmnd_16 {
u32 lunmap_id; /* index into lunmap table */
u8 special_req_flags; /* special exchange request flags */
u8 _resvd0[3]; /* reserved */
u32 sgl_cnt; /* scatter-gather list count */
u32 sense_len; /* sense buffer length */
u64 sgl_addr; /* scatter-gather list addr */
u64 sense_addr; /* sense buffer address */
u8 crn; /* SCSI Command Reference No. */
u8 pri_ta; /* SCSI Priority and Task attribute */
u8 _resvd1; /* reserved: should be 0 */
u8 flags; /* command flags */
u8 scsi_cdb[CDB_16]; /* SCSI Cmnd Descriptor Block */
u32 data_len; /* length of data expected */
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 _resvd2; /* reserved */
u8 d_id[3]; /* FC vNIC only: Target D_ID */
u16 mss; /* FC vNIC only: max burst */
u16 _resvd3; /* reserved */
u32 r_a_tov; /* FC vNIC only: Res. Alloc Timeout */
u32 e_d_tov; /* FC vNIC only: Err Detect Timeout */
};
/*
* Special request flags
*/
#define FCPIO_ICMND_SRFLAG_RETRY 0x01 /* Enable Retry handling on exchange */
/*
* Priority/Task Attribute settings
*/
#define FCPIO_ICMND_PTA_SIMPLE 0 /* simple task attribute */
#define FCPIO_ICMND_PTA_HEADQ 1 /* head of queue task attribute */
#define FCPIO_ICMND_PTA_ORDERED 2 /* ordered task attribute */
#define FCPIO_ICMND_PTA_ACA 4 /* auto contingent allegiance */
#define FCPIO_ICMND_PRI_SHIFT 3 /* priority field starts in bit 3 */
/*
* Command flags
*/
#define FCPIO_ICMND_RDDATA 0x02 /* read data */
#define FCPIO_ICMND_WRDATA 0x01 /* write data */
/*
* fcpio_icmnd_32: host -> firmware request
*
* used for sending out an initiator SCSI 32-byte command
*/
struct fcpio_icmnd_32 {
u32 lunmap_id; /* index into lunmap table */
u8 special_req_flags; /* special exchange request flags */
u8 _resvd0[3]; /* reserved */
u32 sgl_cnt; /* scatter-gather list count */
u32 sense_len; /* sense buffer length */
u64 sgl_addr; /* scatter-gather list addr */
u64 sense_addr; /* sense buffer address */
u8 crn; /* SCSI Command Reference No. */
u8 pri_ta; /* SCSI Priority and Task attribute */
u8 _resvd1; /* reserved: should be 0 */
u8 flags; /* command flags */
u8 scsi_cdb[CDB_32]; /* SCSI Cmnd Descriptor Block */
u32 data_len; /* length of data expected */
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 _resvd2; /* reserved */
u8 d_id[3]; /* FC vNIC only: Target D_ID */
u16 mss; /* FC vNIC only: max burst */
u16 _resvd3; /* reserved */
u32 r_a_tov; /* FC vNIC only: Res. Alloc Timeout */
u32 e_d_tov; /* FC vNIC only: Error Detect Timeout */
};
/*
* fcpio_itmf: host -> firmware request
*
* used for requesting the firmware to abort a request and/or send out
* a task management function
*
* The t_tag field is only needed when the request type is ABT_TASK.
*/
struct fcpio_itmf {
u32 lunmap_id; /* index into lunmap table */
u32 tm_req; /* SCSI Task Management request */
u32 t_tag; /* header tag of fcpio to be aborted */
u32 _resvd; /* _reserved */
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 _resvd1; /* reserved */
u8 d_id[3]; /* FC vNIC only: Target D_ID */
u32 r_a_tov; /* FC vNIC only: R_A_TOV in msec */
u32 e_d_tov; /* FC vNIC only: E_D_TOV in msec */
};
/*
* Task Management request
*/
enum fcpio_itmf_tm_req_type {
FCPIO_ITMF_ABT_TASK_TERM = 0x01, /* abort task and terminate */
FCPIO_ITMF_ABT_TASK, /* abort task and issue abts */
FCPIO_ITMF_ABT_TASK_SET, /* abort task set */
FCPIO_ITMF_CLR_TASK_SET, /* clear task set */
FCPIO_ITMF_LUN_RESET, /* logical unit reset task mgmt */
FCPIO_ITMF_CLR_ACA, /* Clear ACA condition */
};
/*
* fcpio_tdata: host -> firmware request
*
* used for requesting the firmware to send out a read data transfer for a
* target command
*/
struct fcpio_tdata {
u16 rx_id; /* FC rx_id of target command */
u16 flags; /* command flags */
u32 rel_offset; /* data sequence relative offset */
u32 sgl_cnt; /* scatter-gather list count */
u32 data_len; /* length of data expected to send */
u64 sgl_addr; /* scatter-gather list address */
};
/*
* Command flags
*/
#define FCPIO_TDATA_SCSI_RSP 0x01 /* send a scsi resp. after last frame */
/*
* fcpio_txrdy: host -> firmware request
*
* used for requesting the firmware to send out a write data transfer for a
* target command
*/
struct fcpio_txrdy {
u16 rx_id; /* FC rx_id of target command */
u16 _resvd0; /* reserved */
u32 rel_offset; /* data sequence relative offset */
u32 sgl_cnt; /* scatter-gather list count */
u32 data_len; /* length of data expected to send */
u64 sgl_addr; /* scatter-gather list address */
};
/*
* fcpio_trsp: host -> firmware request
*
* used for requesting the firmware to send out a response for a target
* command
*/
struct fcpio_trsp {
u16 rx_id; /* FC rx_id of target command */
u16 _resvd0; /* reserved */
u32 sense_len; /* sense data buffer length */
u64 sense_addr; /* sense data buffer address */
u16 _resvd1; /* reserved */
u8 flags; /* response request flags */
u8 scsi_status; /* SCSI status */
u32 residual; /* SCSI data residual value of I/O */
};
/*
* resposnse request flags
*/
#define FCPIO_TRSP_RESID_UNDER 0x08 /* residual is valid and is underflow */
#define FCPIO_TRSP_RESID_OVER 0x04 /* residual is valid and is overflow */
/*
* fcpio_ttmf_ack: host -> firmware response
*
* used by the host to indicate to the firmware it has received and processed
* the target tmf request
*/
struct fcpio_ttmf_ack {
u16 rx_id; /* FC rx_id of target command */
u16 _resvd0; /* reserved */
u32 tmf_status; /* SCSI task management status */
};
/*
* fcpio_tabort: host -> firmware request
*
* used by the host to request the firmware to abort a target request that was
* received by the firmware
*/
struct fcpio_tabort {
u16 rx_id; /* rx_id of the target request */
};
/*
* fcpio_reset: host -> firmware request
*
* used by the host to signal a reset of the driver to the firmware
* and to request firmware to clean up all outstanding I/O
*/
struct fcpio_reset {
u32 _resvd;
};
enum fcpio_flogi_reg_format_type {
FCPIO_FLOGI_REG_DEF_DEST = 0, /* Use the oui | s_id mac format */
FCPIO_FLOGI_REG_GW_DEST, /* Use the fixed gateway mac */
};
/*
* fcpio_flogi_reg: host -> firmware request
*
* fc vnic only
* used by the host to notify the firmware of the lif's s_id
* and destination mac address format
*/
struct fcpio_flogi_reg {
u8 format;
u8 s_id[3]; /* FC vNIC only: Source S_ID */
u8 gateway_mac[ETH_ALEN]; /* Destination gateway mac */
u16 _resvd;
u32 r_a_tov; /* R_A_TOV in msec */
u32 e_d_tov; /* E_D_TOV in msec */
};
/*
* fcpio_echo: host -> firmware request
*
* sends a heartbeat echo request to the firmware
*/
struct fcpio_echo {
u32 _resvd;
};
/*
* fcpio_lunmap_req: host -> firmware request
*
* scsi vnic only
* sends a request to retrieve the lunmap table for scsi vnics
*/
struct fcpio_lunmap_req {
u64 addr; /* address of the buffer */
u32 len; /* len of the buffer */
};
/*
* fcpio_flogi_fip_reg: host -> firmware request
*
* fc vnic only
* used by the host to notify the firmware of the lif's s_id
* and destination mac address format
*/
struct fcpio_flogi_fip_reg {
u8 _resvd0;
u8 s_id[3]; /* FC vNIC only: Source S_ID */
u8 fcf_mac[ETH_ALEN]; /* FCF Target destination mac */
u16 _resvd1;
u32 r_a_tov; /* R_A_TOV in msec */
u32 e_d_tov; /* E_D_TOV in msec */
u8 ha_mac[ETH_ALEN]; /* Host adapter source mac */
u16 _resvd2;
};
/*
* Basic structure for all fcpio structures that are sent from the host to the
* firmware. They are 128 bytes per structure.
*/
#define FCPIO_HOST_REQ_LEN 128 /* expected length of host requests */
struct fcpio_host_req {
struct fcpio_header hdr;
union {
/*
* Defines space needed for request
*/
u8 buf[FCPIO_HOST_REQ_LEN - sizeof(struct fcpio_header)];
/*
* Initiator host requests
*/
struct fcpio_icmnd_16 icmnd_16;
struct fcpio_icmnd_32 icmnd_32;
struct fcpio_itmf itmf;
/*
* Target host requests
*/
struct fcpio_tdata tdata;
struct fcpio_txrdy txrdy;
struct fcpio_trsp trsp;
struct fcpio_ttmf_ack ttmf_ack;
struct fcpio_tabort tabort;
/*
* Misc requests
*/
struct fcpio_reset reset;
struct fcpio_flogi_reg flogi_reg;
struct fcpio_echo echo;
struct fcpio_lunmap_req lunmap_req;
struct fcpio_flogi_fip_reg flogi_fip_reg;
} u;
};
/*
* fcpio_icmnd_cmpl: firmware -> host response
*
* used for sending the host a response to an initiator command
*/
struct fcpio_icmnd_cmpl {
u8 _resvd0[6]; /* reserved */
u8 flags; /* response flags */
u8 scsi_status; /* SCSI status */
u32 residual; /* SCSI data residual length */
u32 sense_len; /* SCSI sense length */
};
/*
* response flags
*/
#define FCPIO_ICMND_CMPL_RESID_UNDER 0x08 /* resid under and valid */
#define FCPIO_ICMND_CMPL_RESID_OVER 0x04 /* resid over and valid */
/*
* fcpio_itmf_cmpl: firmware -> host response
*
* used for sending the host a response for a itmf request
*/
struct fcpio_itmf_cmpl {
u32 _resvd; /* reserved */
};
/*
* fcpio_tcmnd_16: firmware -> host request
*
* used by the firmware to notify the host of an incoming target SCSI 16-Byte
* request
*/
struct fcpio_tcmnd_16 {
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 crn; /* SCSI Command Reference No. */
u8 pri_ta; /* SCSI Priority and Task attribute */
u8 _resvd2; /* reserved: should be 0 */
u8 flags; /* command flags */
u8 scsi_cdb[CDB_16]; /* SCSI Cmnd Descriptor Block */
u32 data_len; /* length of data expected */
u8 _resvd1; /* reserved */
u8 s_id[3]; /* FC vNIC only: Source S_ID */
};
/*
* Priority/Task Attribute settings
*/
#define FCPIO_TCMND_PTA_SIMPLE 0 /* simple task attribute */
#define FCPIO_TCMND_PTA_HEADQ 1 /* head of queue task attribute */
#define FCPIO_TCMND_PTA_ORDERED 2 /* ordered task attribute */
#define FCPIO_TCMND_PTA_ACA 4 /* auto contingent allegiance */
#define FCPIO_TCMND_PRI_SHIFT 3 /* priority field starts in bit 3 */
/*
* Command flags
*/
#define FCPIO_TCMND_RDDATA 0x02 /* read data */
#define FCPIO_TCMND_WRDATA 0x01 /* write data */
/*
* fcpio_tcmnd_32: firmware -> host request
*
* used by the firmware to notify the host of an incoming target SCSI 32-Byte
* request
*/
struct fcpio_tcmnd_32 {
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 crn; /* SCSI Command Reference No. */
u8 pri_ta; /* SCSI Priority and Task attribute */
u8 _resvd2; /* reserved: should be 0 */
u8 flags; /* command flags */
u8 scsi_cdb[CDB_32]; /* SCSI Cmnd Descriptor Block */
u32 data_len; /* length of data expected */
u8 _resvd0; /* reserved */
u8 s_id[3]; /* FC vNIC only: Source S_ID */
};
/*
* fcpio_tdrsp_cmpl: firmware -> host response
*
* used by the firmware to notify the host of a response to a host target
* command
*/
struct fcpio_tdrsp_cmpl {
u16 rx_id; /* rx_id of the target request */
u16 _resvd0; /* reserved */
};
/*
* fcpio_ttmf: firmware -> host request
*
* used by the firmware to notify the host of an incoming task management
* function request
*/
struct fcpio_ttmf {
u8 _resvd0; /* reserved */
u8 s_id[3]; /* FC vNIC only: Source S_ID */
u8 lun[LUN_ADDRESS]; /* FC vNIC only: LUN address */
u8 crn; /* SCSI Command Reference No. */
u8 _resvd2[3]; /* reserved */
u32 tmf_type; /* task management request type */
};
/*
* Task Management request
*/
#define FCPIO_TTMF_CLR_ACA 0x40 /* Clear ACA condition */
#define FCPIO_TTMF_LUN_RESET 0x10 /* logical unit reset task mgmt */
#define FCPIO_TTMF_CLR_TASK_SET 0x04 /* clear task set */
#define FCPIO_TTMF_ABT_TASK_SET 0x02 /* abort task set */
#define FCPIO_TTMF_ABT_TASK 0x01 /* abort task */
/*
* fcpio_tabort_cmpl: firmware -> host response
*
* used by the firmware to respond to a host's tabort request
*/
struct fcpio_tabort_cmpl {
u16 rx_id; /* rx_id of the target request */
u16 _resvd0; /* reserved */
};
/*
* fcpio_ack: firmware -> host response
*
* used by firmware to notify the host of the last work request received
*/
struct fcpio_ack {
u16 request_out; /* last host entry received */
u16 _resvd;
};
/*
* fcpio_reset_cmpl: firmware -> host response
*
* use by firmware to respond to the host's reset request
*/
struct fcpio_reset_cmpl {
u16 vnic_id;
};
/*
* fcpio_flogi_reg_cmpl: firmware -> host response
*
* fc vnic only
* response to the fcpio_flogi_reg request
*/
struct fcpio_flogi_reg_cmpl {
u32 _resvd;
};
/*
* fcpio_echo_cmpl: firmware -> host response
*
* response to the fcpio_echo request
*/
struct fcpio_echo_cmpl {
u32 _resvd;
};
/*
* fcpio_lunmap_chng: firmware -> host notification
*
* scsi vnic only
* notifies the host that the lunmap tables have changed
*/
struct fcpio_lunmap_chng {
u32 _resvd;
};
/*
* fcpio_lunmap_req_cmpl: firmware -> host response
*
* scsi vnic only
* response for lunmap table request from the host
*/
struct fcpio_lunmap_req_cmpl {
u32 _resvd;
};
/*
* Basic structure for all fcpio structures that are sent from the firmware to
* the host. They are 64 bytes per structure.
*/
#define FCPIO_FW_REQ_LEN 64 /* expected length of fw requests */
struct fcpio_fw_req {
struct fcpio_header hdr;
union {
/*
* Defines space needed for request
*/
u8 buf[FCPIO_FW_REQ_LEN - sizeof(struct fcpio_header)];
/*
* Initiator firmware responses
*/
struct fcpio_icmnd_cmpl icmnd_cmpl;
struct fcpio_itmf_cmpl itmf_cmpl;
/*
* Target firmware new requests
*/
struct fcpio_tcmnd_16 tcmnd_16;
struct fcpio_tcmnd_32 tcmnd_32;
/*
* Target firmware responses
*/
struct fcpio_tdrsp_cmpl tdrsp_cmpl;
struct fcpio_ttmf ttmf;
struct fcpio_tabort_cmpl tabort_cmpl;
/*
* Firmware response to work received
*/
struct fcpio_ack ack;
/*
* Misc requests
*/
struct fcpio_reset_cmpl reset_cmpl;
struct fcpio_flogi_reg_cmpl flogi_reg_cmpl;
struct fcpio_echo_cmpl echo_cmpl;
struct fcpio_lunmap_chng lunmap_chng;
struct fcpio_lunmap_req_cmpl lunmap_req_cmpl;
} u;
};
/*
* Access routines to encode and decode the color bit, which is the most
* significant bit of the MSB of the structure
*/
static inline void fcpio_color_enc(struct fcpio_fw_req *fw_req, u8 color)
{
u8 *c = ((u8 *) fw_req) + sizeof(struct fcpio_fw_req) - 1;
if (color)
*c |= 0x80;
else
*c &= ~0x80;
}
static inline void fcpio_color_dec(struct fcpio_fw_req *fw_req, u8 *color)
{
u8 *c = ((u8 *) fw_req) + sizeof(struct fcpio_fw_req) - 1;
*color = *c >> 7;
/*
* Make sure color bit is read from desc *before* other fields
* are read from desc. Hardware guarantees color bit is last
* bit (byte) written. Adding the rmb() prevents the compiler
* and/or CPU from reordering the reads which would potentially
* result in reading stale values.
*/
rmb();
}
/*
* Lunmap table entry for scsi vnics
*/
#define FCPIO_LUNMAP_TABLE_SIZE 256
#define FCPIO_FLAGS_LUNMAP_VALID 0x80
#define FCPIO_FLAGS_BOOT 0x01
struct fcpio_lunmap_entry {
u8 bus;
u8 target;
u8 lun;
u8 path_cnt;
u16 flags;
u16 update_cnt;
};
struct fcpio_lunmap_tbl {
u32 update_cnt;
struct fcpio_lunmap_entry lunmaps[FCPIO_LUNMAP_TABLE_SIZE];
};
#endif /* _FCPIO_H_ */