141 lines
5.1 KiB
C
141 lines
5.1 KiB
C
/**********************************************************************
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* Author: Cavium, Inc.
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*
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* Contact: support@cavium.com
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* Please include "LiquidIO" in the subject.
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*
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* Copyright (c) 2003-2015 Cavium, Inc.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, Version 2, as
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* published by the Free Software Foundation.
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*
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* This file is distributed in the hope that it will be useful, but
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* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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* NONINFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* This file may also be available under a different license from Cavium.
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* Contact Cavium, Inc. for more information
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**********************************************************************/
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/*! \file response_manager.h
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* \brief Host Driver: Response queues for host instructions.
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*/
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#ifndef __RESPONSE_MANAGER_H__
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#define __RESPONSE_MANAGER_H__
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/** Maximum ordered requests to process in every invocation of
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* lio_process_ordered_list(). The function will continue to process requests
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* as long as it can find one that has finished processing. If it keeps
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* finding requests that have completed, the function can run for ever. The
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* value defined here sets an upper limit on the number of requests it can
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* process before it returns control to the poll thread.
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*/
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#define MAX_ORD_REQS_TO_PROCESS 4096
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/** Head of a response list. There are several response lists in the
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* system. One for each response order- Unordered, ordered
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* and 1 for noresponse entries on each instruction queue.
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*/
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struct octeon_response_list {
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/** List structure to add delete pending entries to */
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struct list_head head;
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/** A lock for this response list */
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spinlock_t lock;
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atomic_t pending_req_count;
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};
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/** The type of response list.
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*/
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enum {
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OCTEON_ORDERED_LIST = 0,
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OCTEON_UNORDERED_NONBLOCKING_LIST = 1,
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OCTEON_UNORDERED_BLOCKING_LIST = 2,
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OCTEON_ORDERED_SC_LIST = 3
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};
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/** Response Order values for a Octeon Request. */
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enum {
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OCTEON_RESP_ORDERED = 0,
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OCTEON_RESP_UNORDERED = 1,
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OCTEON_RESP_NORESPONSE = 2
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};
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/** Error codes used in Octeon Host-Core communication.
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*
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* 31 16 15 0
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* ---------------------------------
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* | | |
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* ---------------------------------
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* Error codes are 32-bit wide. The upper 16-bits, called Major Error Number,
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* are reserved to identify the group to which the error code belongs. The
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* lower 16-bits, called Minor Error Number, carry the actual code.
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*
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* So error codes are (MAJOR NUMBER << 16)| MINOR_NUMBER.
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*/
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/*------------ Error codes used by host driver -----------------*/
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#define DRIVER_MAJOR_ERROR_CODE 0x0000
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/** A value of 0x00000000 indicates no error i.e. success */
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#define DRIVER_ERROR_NONE 0x00000000
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/** (Major number: 0x0000; Minor Number: 0x0001) */
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#define DRIVER_ERROR_REQ_PENDING 0x00000001
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#define DRIVER_ERROR_REQ_TIMEOUT 0x00000003
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#define DRIVER_ERROR_REQ_EINTR 0x00000004
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#define DRIVER_ERROR_REQ_ENXIO 0x00000006
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#define DRIVER_ERROR_REQ_ENOMEM 0x0000000C
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#define DRIVER_ERROR_REQ_EINVAL 0x00000016
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#define DRIVER_ERROR_REQ_FAILED 0x000000ff
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/** Status for a request.
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* If a request is not queued to Octeon by the driver, the driver returns
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* an error condition that's describe by one of the OCTEON_REQ_ERR_* value
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* below. If the request is successfully queued, the driver will return
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* a OCTEON_REQUEST_PENDING status. OCTEON_REQUEST_TIMEOUT and
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* OCTEON_REQUEST_INTERRUPTED are only returned by the driver if the
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* response for request failed to arrive before a time-out period or if
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* the request processing * got interrupted due to a signal respectively.
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*/
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enum {
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OCTEON_REQUEST_DONE = (DRIVER_ERROR_NONE),
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OCTEON_REQUEST_PENDING = (DRIVER_ERROR_REQ_PENDING),
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OCTEON_REQUEST_TIMEOUT = (DRIVER_ERROR_REQ_TIMEOUT),
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OCTEON_REQUEST_INTERRUPTED = (DRIVER_ERROR_REQ_EINTR),
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OCTEON_REQUEST_NO_DEVICE = (0x00000021),
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OCTEON_REQUEST_NOT_RUNNING,
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OCTEON_REQUEST_INVALID_IQ,
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OCTEON_REQUEST_INVALID_BUFCNT,
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OCTEON_REQUEST_INVALID_RESP_ORDER,
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OCTEON_REQUEST_NO_MEMORY,
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OCTEON_REQUEST_INVALID_BUFSIZE,
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OCTEON_REQUEST_NO_PENDING_ENTRY,
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OCTEON_REQUEST_NO_IQ_SPACE = (0x7FFFFFFF)
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};
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/** Initialize the response lists. The number of response lists to create is
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* given by count.
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* @param octeon_dev - the octeon device structure.
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*/
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int octeon_setup_response_list(struct octeon_device *octeon_dev);
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void octeon_delete_response_list(struct octeon_device *octeon_dev);
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/** Check the status of first entry in the ordered list. If the instruction at
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* that entry finished processing or has timed-out, the entry is cleaned.
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* @param octeon_dev - the octeon device structure.
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* @param force_quit - the request is forced to timeout if this is 1
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* @return 1 if the ordered list is empty, 0 otherwise.
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*/
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int lio_process_ordered_list(struct octeon_device *octeon_dev,
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u32 force_quit);
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#endif
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