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Commit 5ce9231c authored by Juergen Gross's avatar Juergen Gross
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xen: update vscsiif.h 

Update include/xen/interface/io/vscsiif.h to its newest version.
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220428075323.12853-2-jgross@suse.comSigned-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 42226c98
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Showing with 129 additions and 4 deletions
include/xen/interface/io/vscsiif.h
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......@@ -43,7 +43,7 @@
*
* A string specifying the backend device: either a 4-tuple "h:c:t:l"
* (host, controller, target, lun, all integers), or a WWN (e.g.
* "naa.60014054ac780582").
* "naa.60014054ac780582:0").
*
* v-dev
* Values: string
......@@ -87,6 +87,75 @@
* response structures.
*/
/*
* Xenstore format in practice
* ===========================
*
* The backend driver uses a single_host:many_devices notation to manage domU
* devices. Everything is stored in /local/domain/<backend_domid>/backend/vscsi/.
* The xenstore layout looks like this (dom0 is assumed to be the backend_domid):
*
* <domid>/<vhost>/feature-host = "0"
* <domid>/<vhost>/frontend = "/local/domain/<domid>/device/vscsi/0"
* <domid>/<vhost>/frontend-id = "<domid>"
* <domid>/<vhost>/online = "1"
* <domid>/<vhost>/state = "4"
* <domid>/<vhost>/vscsi-devs/dev-0/p-dev = "8:0:2:1" or "naa.wwn:lun"
* <domid>/<vhost>/vscsi-devs/dev-0/state = "4"
* <domid>/<vhost>/vscsi-devs/dev-0/v-dev = "0:0:0:0"
* <domid>/<vhost>/vscsi-devs/dev-1/p-dev = "8:0:2:2"
* <domid>/<vhost>/vscsi-devs/dev-1/state = "4"
* <domid>/<vhost>/vscsi-devs/dev-1/v-dev = "0:0:1:0"
*
* The frontend driver maintains its state in
* /local/domain/<domid>/device/vscsi/.
*
* <vhost>/backend = "/local/domain/0/backend/vscsi/<domid>/<vhost>"
* <vhost>/backend-id = "0"
* <vhost>/event-channel = "20"
* <vhost>/ring-ref = "43"
* <vhost>/state = "4"
* <vhost>/vscsi-devs/dev-0/state = "4"
* <vhost>/vscsi-devs/dev-1/state = "4"
*
* In addition to the entries for backend and frontend these flags are stored
* for the toolstack:
*
* <domid>/<vhost>/vscsi-devs/dev-1/p-devname = "/dev/$device"
* <domid>/<vhost>/libxl_ctrl_index = "0"
*
*
* Backend/frontend protocol
* =========================
*
* To create a vhost along with a device:
* <domid>/<vhost>/feature-host = "0"
* <domid>/<vhost>/frontend = "/local/domain/<domid>/device/vscsi/0"
* <domid>/<vhost>/frontend-id = "<domid>"
* <domid>/<vhost>/online = "1"
* <domid>/<vhost>/state = "1"
* <domid>/<vhost>/vscsi-devs/dev-0/p-dev = "8:0:2:1"
* <domid>/<vhost>/vscsi-devs/dev-0/state = "1"
* <domid>/<vhost>/vscsi-devs/dev-0/v-dev = "0:0:0:0"
* Wait for <domid>/<vhost>/state + <domid>/<vhost>/vscsi-devs/dev-0/state become 4
*
* To add another device to a vhost:
* <domid>/<vhost>/state = "7"
* <domid>/<vhost>/vscsi-devs/dev-1/p-dev = "8:0:2:2"
* <domid>/<vhost>/vscsi-devs/dev-1/state = "1"
* <domid>/<vhost>/vscsi-devs/dev-1/v-dev = "0:0:1:0"
* Wait for <domid>/<vhost>/state + <domid>/<vhost>/vscsi-devs/dev-1/state become 4
*
* To remove a device from a vhost:
* <domid>/<vhost>/state = "7"
* <domid>/<vhost>/vscsi-devs/dev-1/state = "5"
* Wait for <domid>/<vhost>/state to become 4
* Wait for <domid>/<vhost>/vscsi-devs/dev-1/state become 6
* Remove <domid>/<vhost>/vscsi-devs/dev-1/{state,p-dev,v-dev,p-devname}
* Remove <domid>/<vhost>/vscsi-devs/dev-1/
*
*/
/* Requests from the frontend to the backend */
/*
......@@ -117,7 +186,8 @@
* (plus the set VSCSIIF_SG_GRANT bit), the number of scsiif_request_segment
* elements referencing the target data buffers is calculated from the lengths
* of the seg[] elements (the sum of all valid seg[].length divided by the
* size of one scsiif_request_segment structure).
* size of one scsiif_request_segment structure). The frontend may use a mix of
* direct and indirect requests.
*/
#define VSCSIIF_ACT_SCSI_CDB 1
......@@ -154,12 +224,14 @@
/*
* based on Linux kernel 2.6.18, still valid
*
* Changing these values requires support of multiple protocols via the rings
* as "old clients" will blindly use these values and the resulting structure
* sizes.
*/
#define VSCSIIF_MAX_COMMAND_SIZE 16
#define VSCSIIF_SENSE_BUFFERSIZE 96
#define VSCSIIF_PAGE_SIZE 4096
struct scsiif_request_segment {
grant_ref_t gref;
......@@ -167,7 +239,8 @@ struct scsiif_request_segment {
uint16_t length;
};
#define VSCSIIF_SG_PER_PAGE (PAGE_SIZE / sizeof(struct scsiif_request_segment))
#define VSCSIIF_SG_PER_PAGE (VSCSIIF_PAGE_SIZE / \
sizeof(struct scsiif_request_segment))
/* Size of one request is 252 bytes */
struct vscsiif_request {
......@@ -207,6 +280,58 @@ struct vscsiif_response {
uint32_t reserved[36];
};
/* SCSI I/O status from vscsiif_response->rslt */
#define XEN_VSCSIIF_RSLT_STATUS(x) ((x) & 0x00ff)
/* Host I/O status from vscsiif_response->rslt */
#define XEN_VSCSIIF_RSLT_HOST(x) (((x) & 0x00ff0000) >> 16)
#define XEN_VSCSIIF_RSLT_HOST_OK 0
/* Couldn't connect before timeout */
#define XEN_VSCSIIF_RSLT_HOST_NO_CONNECT 1
/* Bus busy through timeout */
#define XEN_VSCSIIF_RSLT_HOST_BUS_BUSY 2
/* Timed out for other reason */
#define XEN_VSCSIIF_RSLT_HOST_TIME_OUT 3
/* Bad target */
#define XEN_VSCSIIF_RSLT_HOST_BAD_TARGET 4
/* Abort for some other reason */
#define XEN_VSCSIIF_RSLT_HOST_ABORT 5
/* Parity error */
#define XEN_VSCSIIF_RSLT_HOST_PARITY 6
/* Internal error */
#define XEN_VSCSIIF_RSLT_HOST_ERROR 7
/* Reset by somebody */
#define XEN_VSCSIIF_RSLT_HOST_RESET 8
/* Unexpected interrupt */
#define XEN_VSCSIIF_RSLT_HOST_BAD_INTR 9
/* Force command past mid-layer */
#define XEN_VSCSIIF_RSLT_HOST_PASSTHROUGH 10
/* Retry requested */
#define XEN_VSCSIIF_RSLT_HOST_SOFT_ERROR 11
/* Hidden retry requested */
#define XEN_VSCSIIF_RSLT_HOST_IMM_RETRY 12
/* Requeue command requested */
#define XEN_VSCSIIF_RSLT_HOST_REQUEUE 13
/* Transport error disrupted I/O */
#define XEN_VSCSIIF_RSLT_HOST_TRANSPORT_DISRUPTED 14
/* Transport class fastfailed */
#define XEN_VSCSIIF_RSLT_HOST_TRANSPORT_FAILFAST 15
/* Permanent target failure */
#define XEN_VSCSIIF_RSLT_HOST_TARGET_FAILURE 16
/* Permanent nexus failure on path */
#define XEN_VSCSIIF_RSLT_HOST_NEXUS_FAILURE 17
/* Space allocation on device failed */
#define XEN_VSCSIIF_RSLT_HOST_ALLOC_FAILURE 18
/* Medium error */
#define XEN_VSCSIIF_RSLT_HOST_MEDIUM_ERROR 19
/* Transport marginal errors */
#define XEN_VSCSIIF_RSLT_HOST_TRANSPORT_MARGINAL 20
/* Result values of reset operations */
#define XEN_VSCSIIF_RSLT_RESET_SUCCESS 0x2002
#define XEN_VSCSIIF_RSLT_RESET_FAILED 0x2003
DEFINE_RING_TYPES(vscsiif, struct vscsiif_request, struct vscsiif_response);
#endif /*__XEN__PUBLIC_IO_SCSI_H__*/
#endif /*__XEN__PUBLIC_IO_SCSI_H__*/
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