summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/cavium/liquidio/response_manager.h
blob: cbb2d84e89323aea4852c31c164c2ff49c40257c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/**********************************************************************
 * 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