LXR linux/drivers/net/ethernet/cavium/liquidio/response

   1/**********************************************************************
   2 * Author: Cavium, Inc.
   3 *
   4 * Contact: support@cavium.com
   5 *          Please include "LiquidIO" in the subject.
   6 *
   7 * Copyright (c) 2003-2015 Cavium, Inc.
   8 *
   9 * This file is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License, Version 2, as
  11 * published by the Free Software Foundation.
  12 *
  13 * This file is distributed in the hope that it will be useful, but
  14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16 * NONINFRINGEMENT.  See the GNU General Public License for more
  17 * details.
  18 *
  19 * This file may also be available under a different license from Cavium.
  20 * Contact Cavium, Inc. for more information
  21 **********************************************************************/
  22
  23/*! \file response_manager.h
  24 *  \brief Host Driver:  Response queues for host instructions.
  25 */
  26
  27#ifndef __RESPONSE_MANAGER_H__
  28#define __RESPONSE_MANAGER_H__
  29
  30/** Maximum ordered requests to process in every invocation of
  31 * lio_process_ordered_list(). The function will continue to process requests
  32 * as long as it can find one that has finished processing. If it keeps
  33 * finding requests that have completed, the function can run for ever. The
  34 * value defined here sets an upper limit on the number of requests it can
  35 * process before it returns control to the poll thread.
  36 */
  37#define  MAX_ORD_REQS_TO_PROCESS   4096
  38
  39/** Head of a response list. There are several response lists in the
  40 *  system. One for each response order- Unordered, ordered
  41 *  and 1 for noresponse entries on each instruction queue.
  42 */
  43struct octeon_response_list {
  44        /** List structure to add delete pending entries to */
  45        struct list_head head;
  46
  47        /** A lock for this response list */
  48        spinlock_t lock;
  49
  50        atomic_t pending_req_count;
  51};
  52
  53/** The type of response list.
  54 */
  55enum {
  56        OCTEON_ORDERED_LIST = 0,
  57        OCTEON_UNORDERED_NONBLOCKING_LIST = 1,
  58        OCTEON_UNORDERED_BLOCKING_LIST = 2,
  59        OCTEON_ORDERED_SC_LIST = 3
  60};
  61
  62/** Response Order values for a Octeon Request. */
  63enum {
  64        OCTEON_RESP_ORDERED = 0,
  65        OCTEON_RESP_UNORDERED = 1,
  66        OCTEON_RESP_NORESPONSE = 2
  67};
  68
  69/** Error codes  used in Octeon Host-Core communication.
  70 *
  71 *   31            16 15            0
  72 *   ---------------------------------
  73 *   |               |               |
  74 *   ---------------------------------
  75 *   Error codes are 32-bit wide. The upper 16-bits, called Major Error Number,
  76 *   are reserved to identify the group to which the error code belongs. The
  77 *   lower 16-bits, called Minor Error Number, carry the actual code.
  78 *
  79 *   So error codes are (MAJOR NUMBER << 16)| MINOR_NUMBER.
  80 */
  81
  82/*------------   Error codes used by host driver   -----------------*/
  83#define DRIVER_MAJOR_ERROR_CODE           0x0000
  84
  85/**  A value of 0x00000000 indicates no error i.e. success */
  86#define DRIVER_ERROR_NONE                 0x00000000
  87
  88/**  (Major number: 0x0000; Minor Number: 0x0001) */
  89#define DRIVER_ERROR_REQ_PENDING          0x00000001
  90#define DRIVER_ERROR_REQ_TIMEOUT          0x00000003
  91#define DRIVER_ERROR_REQ_EINTR            0x00000004
  92#define DRIVER_ERROR_REQ_ENXIO            0x00000006
  93#define DRIVER_ERROR_REQ_ENOMEM           0x0000000C
  94#define DRIVER_ERROR_REQ_EINVAL           0x00000016
  95#define DRIVER_ERROR_REQ_FAILED           0x000000ff
  96
  97/** Status for a request.
  98 * If a request is not queued to Octeon by the driver, the driver returns
  99 * an error condition that's describe by one of the OCTEON_REQ_ERR_* value
 100 * below. If the request is successfully queued, the driver will return
 101 * a OCTEON_REQUEST_PENDING status. OCTEON_REQUEST_TIMEOUT and
 102 * OCTEON_REQUEST_INTERRUPTED are only returned by the driver if the
 103 * response for request failed to arrive before a time-out period or if
 104 * the request processing * got interrupted due to a signal respectively.
 105 */
 106enum {
 107        OCTEON_REQUEST_DONE = (DRIVER_ERROR_NONE),
 108        OCTEON_REQUEST_PENDING = (DRIVER_ERROR_REQ_PENDING),
 109        OCTEON_REQUEST_TIMEOUT = (DRIVER_ERROR_REQ_TIMEOUT),
 110        OCTEON_REQUEST_INTERRUPTED = (DRIVER_ERROR_REQ_EINTR),
 111        OCTEON_REQUEST_NO_DEVICE = (0x00000021),
 112        OCTEON_REQUEST_NOT_RUNNING,
 113        OCTEON_REQUEST_INVALID_IQ,
 114        OCTEON_REQUEST_INVALID_BUFCNT,
 115        OCTEON_REQUEST_INVALID_RESP_ORDER,
 116        OCTEON_REQUEST_NO_MEMORY,
 117        OCTEON_REQUEST_INVALID_BUFSIZE,
 118        OCTEON_REQUEST_NO_PENDING_ENTRY,
 119        OCTEON_REQUEST_NO_IQ_SPACE = (0x7FFFFFFF)
 120
 121};
 122
 123/** Initialize the response lists. The number of response lists to create is
 124 * given by count.
 125 * @param octeon_dev      - the octeon device structure.
 126 */
 127int octeon_setup_response_list(struct octeon_device *octeon_dev);
 128
 129void octeon_delete_response_list(struct octeon_device *octeon_dev);
 130
 131/** Check the status of first entry in the ordered list. If the instruction at
 132 * that entry finished processing or has timed-out, the entry is cleaned.
 133 * @param octeon_dev  - the octeon device structure.
 134 * @param force_quit - the request is forced to timeout if this is 1
 135 * @return 1 if the ordered list is empty, 0 otherwise.
 136 */
 137int lio_process_ordered_list(struct octeon_device *octeon_dev,
 138                             u32 force_quit);
 139
 140#endif
 141