1 /* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
2 *
3 * Copyright (c) 2004 - 2009 Broadcom Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation.
8 *
9 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
10 */
11
12 #include "bnx2i.h"
13
14 /**
15 * bnx2i_dev_to_hba - maps dev pointer to adapter struct
16 * @dev: device pointer
17 *
18 * Map device to hba structure
19 */
20 static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
21 {
22 struct Scsi_Host *shost = class_to_shost(dev);
23 return iscsi_host_priv(shost);
24 }
25
26
27 /**
28 * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
29 * @dev: device pointer
30 * @buf: buffer to return current SQ size parameter
31 *
32 * Returns current SQ size parameter, this paramater determines the number
33 * outstanding iSCSI commands supported on a connection
34 */
35 static ssize_t bnx2i_show_sq_info(struct device *dev,
36 struct device_attribute *attr, char *buf)
37 {
38 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
39
40 return sprintf(buf, "0x%x\n", hba->max_sqes);
41 }
42
43
44 /**
45 * bnx2i_set_sq_info - update send queue (SQ) size parameter
46 * @dev: device pointer
47 * @buf: buffer to return current SQ size parameter
48 * @count: parameter buffer size
49 *
50 * Interface for user to change shared queue size allocated for each conn
51 * Must be within SQ limits and a power of 2. For the latter this is needed
52 * because of how libiscsi preallocates tasks.
53 */
54 static ssize_t bnx2i_set_sq_info(struct device *dev,
55 struct device_attribute *attr,
56 const char *buf, size_t count)
57 {
58 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
59 u32 val;
60 int max_sq_size;
61
62 if (hba->ofld_conns_active)
63 goto skip_config;
64
65 if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
66 max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
67 else
68 max_sq_size = BNX2I_570X_SQ_WQES_MAX;
69
70 if (sscanf(buf, " 0x%x ", &val) > 0) {
71 if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
72 (is_power_of_2(val)))
73 hba->max_sqes = val;
74 }
75
76 return count;
77
78 skip_config:
79 printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
80 return 0;
81 }
82
83
84 /**
85 * bnx2i_show_ccell_info - returns command cell (HQ) size
86 * @dev: device pointer
87 * @buf: buffer to return current SQ size parameter
88 *
89 * returns per-connection TCP history queue size parameter
90 */
91 static ssize_t bnx2i_show_ccell_info(struct device *dev,
92 struct device_attribute *attr, char *buf)
93 {
94 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
95
96 return sprintf(buf, "0x%x\n", hba->num_ccell);
97 }
98
99
100 /**
101 * bnx2i_get_link_state - set command cell (HQ) size
102 * @dev: device pointer
103 * @buf: buffer to return current SQ size parameter
104 * @count: parameter buffer size
105 *
106 * updates per-connection TCP history queue size parameter
107 */
108 static ssize_t bnx2i_set_ccell_info(struct device *dev,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111 {
112 u32 val;
113 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
114
115 if (hba->ofld_conns_active)
116 goto skip_config;
117
118 if (sscanf(buf, " 0x%x ", &val) > 0) {
119 if ((val >= BNX2I_CCELLS_MIN) &&
120 (val <= BNX2I_CCELLS_MAX)) {
121 hba->num_ccell = val;
122 }
123 }
124
125 return count;
126
127 skip_config:
128 printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
129 return 0;
130 }
131
132
133 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
134 bnx2i_show_sq_info, bnx2i_set_sq_info);
135 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
136 bnx2i_show_ccell_info, bnx2i_set_ccell_info);
137
138 struct device_attribute *bnx2i_dev_attributes[] = {
139 &dev_attr_sq_size,
140 &dev_attr_num_ccell,
141 NULL
142 };
143
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