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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 | }; |