aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/bnx2i/bnx2i_sysfs.c
blob: 9174196d90336cb8430f25e3375fd02b5b56aae9 (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
137
138
139
140
141
142
143
/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
 *
 * Copyright (c) 2004 - 2010 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
 * Maintained by: Eddie Wai (eddie.wai@broadcom.com)
 */

#include "bnx2i.h"

/**
 * bnx2i_dev_to_hba - maps dev pointer to adapter struct
 * @dev:	device pointer
 *
 * Map device to hba structure
 */
static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	return iscsi_host_priv(shost);
}


/**
 * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 *
 * Returns current SQ size parameter, this paramater determines the number
 * outstanding iSCSI commands supported on a connection
 */
static ssize_t bnx2i_show_sq_info(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	return sprintf(buf, "0x%x\n", hba->max_sqes);
}


/**
 * bnx2i_set_sq_info - update send queue (SQ) size parameter
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 * @count:	parameter buffer size
 *
 * Interface for user to change shared queue size allocated for each conn
 * Must be within SQ limits and a power of 2. For the latter this is needed
 * because of how libiscsi preallocates tasks.
 */
static ssize_t bnx2i_set_sq_info(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
	u32 val;
	int max_sq_size;

	if (hba->ofld_conns_active)
		goto skip_config;

	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
		max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
	else
		max_sq_size = BNX2I_570X_SQ_WQES_MAX;

	if (sscanf(buf, " 0x%x ", &val) > 0) {
		if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
		    (is_power_of_2(val)))
			hba->max_sqes = val;
	}

	return count;

skip_config:
	printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
	return 0;
}


/**
 * bnx2i_show_ccell_info - returns command cell (HQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 *
 * returns per-connection TCP history queue size parameter
 */
static ssize_t bnx2i_show_ccell_info(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	return sprintf(buf, "0x%x\n", hba->num_ccell);
}


/**
 * bnx2i_get_link_state - set command cell (HQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 * @count:	parameter buffer size
 *
 * updates per-connection TCP history queue size parameter
 */
static ssize_t bnx2i_set_ccell_info(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	u32 val;
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	if (hba->ofld_conns_active)
		goto skip_config;

	if (sscanf(buf, " 0x%x ", &val) > 0) {
		if ((val >= BNX2I_CCELLS_MIN) &&
		    (val <= BNX2I_CCELLS_MAX)) {
			hba->num_ccell = val;
		}
	}

	return count;

skip_config:
	printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
	return 0;
}


static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
		   bnx2i_show_sq_info, bnx2i_set_sq_info);
static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
		   bnx2i_show_ccell_info, bnx2i_set_ccell_info);

struct device_attribute *bnx2i_dev_attributes[] = {
	&dev_attr_sq_size,
	&dev_attr_num_ccell,
	NULL
};