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/**********************************************************************
* Author: Cavium, Inc.
*
* Contact: support@cavium.com
* Please include "LiquidIO" in the subject.
*
* Copyright (c) 2003-2016 Cavium, Inc.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
**********************************************************************/
/*! \file response_manager.h
* \brief Host Driver: Response queues for host instructions.
*/
#ifndef __RESPONSE_MANAGER_H__
#define __RESPONSE_MANAGER_H__
/** Maximum ordered requests to process in every invocation of
* lio_process_ordered_list(). The function will continue to process requests
* as long as it can find one that has finished processing. If it keeps
* finding requests that have completed, the function can run for ever. The
* value defined here sets an upper limit on the number of requests it can
* process before it returns control to the poll thread.
*/
#define MAX_ORD_REQS_TO_PROCESS 4096
/** Head of a response list. There are several response lists in the
* system. One for each response order- Unordered, ordered
* and 1 for noresponse entries on each instruction queue.
*/
struct octeon_response_list {
/** List structure to add delete pending entries to */
struct list_head head;
/** A lock for this response list */
spinlock_t lock;
atomic_t pending_req_count;
};
/** The type of response list.
*/
enum {
OCTEON_ORDERED_LIST = 0,
OCTEON_UNORDERED_NONBLOCKING_LIST = 1,
OCTEON_UNORDERED_BLOCKING_LIST = 2,
OCTEON_ORDERED_SC_LIST = 3
};
/** Response Order values for a Octeon Request. */
enum {
OCTEON_RESP_ORDERED = 0,
OCTEON_RESP_UNORDERED = 1,
OCTEON_RESP_NORESPONSE = 2
};
/** Error codes used in Octeon Host-Core communication.
*
* 31 16 15 0
* ---------------------------------
* | | |
* ---------------------------------
* Error codes are 32-bit wide. The upper 16-bits, called Major Error Number,
* are reserved to identify the group to which the error code belongs. The
* lower 16-bits, called Minor Error Number, carry the actual code.
*
* So error codes are (MAJOR NUMBER << 16)| MINOR_NUMBER.
*/
/*------------ Error codes used by host driver -----------------*/
#define DRIVER_MAJOR_ERROR_CODE 0x0000
/** A value of 0x00000000 indicates no error i.e. success */
#define DRIVER_ERROR_NONE 0x00000000
#define DRIVER_ERROR_REQ_PENDING 0x00000001
#define DRIVER_ERROR_REQ_TIMEOUT 0x00000003
#define DRIVER_ERROR_REQ_EINTR 0x00000004
#define DRIVER_ERROR_REQ_ENXIO 0x00000006
#define DRIVER_ERROR_REQ_ENOMEM 0x0000000C
#define DRIVER_ERROR_REQ_EINVAL 0x00000016
#define DRIVER_ERROR_REQ_FAILED 0x000000ff
/** Status for a request.
* If a request is not queued to Octeon by the driver, the driver returns
* an error condition that's describe by one of the OCTEON_REQ_ERR_* value
* below. If the request is successfully queued, the driver will return
* a OCTEON_REQUEST_PENDING status. OCTEON_REQUEST_TIMEOUT and
* OCTEON_REQUEST_INTERRUPTED are only returned by the driver if the
* response for request failed to arrive before a time-out period or if
* the request processing * got interrupted due to a signal respectively.
*/
enum {
OCTEON_REQUEST_DONE = (DRIVER_ERROR_NONE),
OCTEON_REQUEST_PENDING = (DRIVER_ERROR_REQ_PENDING),
OCTEON_REQUEST_TIMEOUT = (DRIVER_ERROR_REQ_TIMEOUT),
OCTEON_REQUEST_INTERRUPTED = (DRIVER_ERROR_REQ_EINTR),
OCTEON_REQUEST_NO_DEVICE = (0x00000021),
OCTEON_REQUEST_NOT_RUNNING,
OCTEON_REQUEST_INVALID_IQ,
OCTEON_REQUEST_INVALID_BUFCNT,
OCTEON_REQUEST_INVALID_RESP_ORDER,
OCTEON_REQUEST_NO_MEMORY,
OCTEON_REQUEST_INVALID_BUFSIZE,
OCTEON_REQUEST_NO_PENDING_ENTRY,
OCTEON_REQUEST_NO_IQ_SPACE = (0x7FFFFFFF)
};
/** Initialize the response lists. The number of response lists to create is
* given by count.
* @param octeon_dev - the octeon device structure.
*/
int octeon_setup_response_list(struct octeon_device *octeon_dev);
void octeon_delete_response_list(struct octeon_device *octeon_dev);
/** Check the status of first entry in the ordered list. If the instruction at
* that entry finished processing or has timed-out, the entry is cleaned.
* @param octeon_dev - the octeon device structure.
* @param force_quit - the request is forced to timeout if this is 1
* @return 1 if the ordered list is empty, 0 otherwise.
*/
int lio_process_ordered_list(struct octeon_device *octeon_dev,
u32 force_quit);
#endif
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