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f39a7757 | 1 | /* bnx2i_sysfs.c: QLogic NetXtreme II iSCSI driver. |
cf4e6363 | 2 | * |
0b3bf387 | 3 | * Copyright (c) 2004 - 2013 Broadcom Corporation |
f39a7757 | 4 | * Copyright (c) 2014, QLogic Corporation |
cf4e6363 MC |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation. | |
9 | * | |
10 | * Written by: Anil Veerabhadrappa (anilgv@broadcom.com) | |
f39a7757 VC |
11 | * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com) |
12 | * Maintained by: QLogic-Storage-Upstream@qlogic.com | |
cf4e6363 MC |
13 | */ |
14 | ||
15 | #include "bnx2i.h" | |
16 | ||
17 | /** | |
18 | * bnx2i_dev_to_hba - maps dev pointer to adapter struct | |
19 | * @dev: device pointer | |
20 | * | |
21 | * Map device to hba structure | |
22 | */ | |
23 | static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev) | |
24 | { | |
25 | struct Scsi_Host *shost = class_to_shost(dev); | |
26 | return iscsi_host_priv(shost); | |
27 | } | |
28 | ||
29 | ||
30 | /** | |
31 | * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size | |
32 | * @dev: device pointer | |
33 | * @buf: buffer to return current SQ size parameter | |
34 | * | |
35 | * Returns current SQ size parameter, this paramater determines the number | |
36 | * outstanding iSCSI commands supported on a connection | |
37 | */ | |
38 | static ssize_t bnx2i_show_sq_info(struct device *dev, | |
39 | struct device_attribute *attr, char *buf) | |
40 | { | |
41 | struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); | |
42 | ||
43 | return sprintf(buf, "0x%x\n", hba->max_sqes); | |
44 | } | |
45 | ||
46 | ||
47 | /** | |
48 | * bnx2i_set_sq_info - update send queue (SQ) size parameter | |
49 | * @dev: device pointer | |
50 | * @buf: buffer to return current SQ size parameter | |
51 | * @count: parameter buffer size | |
52 | * | |
53 | * Interface for user to change shared queue size allocated for each conn | |
54 | * Must be within SQ limits and a power of 2. For the latter this is needed | |
55 | * because of how libiscsi preallocates tasks. | |
56 | */ | |
57 | static ssize_t bnx2i_set_sq_info(struct device *dev, | |
58 | struct device_attribute *attr, | |
59 | const char *buf, size_t count) | |
60 | { | |
61 | struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); | |
62 | u32 val; | |
63 | int max_sq_size; | |
64 | ||
65 | if (hba->ofld_conns_active) | |
66 | goto skip_config; | |
67 | ||
68 | if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) | |
69 | max_sq_size = BNX2I_5770X_SQ_WQES_MAX; | |
70 | else | |
71 | max_sq_size = BNX2I_570X_SQ_WQES_MAX; | |
72 | ||
73 | if (sscanf(buf, " 0x%x ", &val) > 0) { | |
74 | if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) && | |
75 | (is_power_of_2(val))) | |
76 | hba->max_sqes = val; | |
77 | } | |
78 | ||
79 | return count; | |
80 | ||
81 | skip_config: | |
82 | printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n"); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | ||
87 | /** | |
88 | * bnx2i_show_ccell_info - returns command cell (HQ) size | |
89 | * @dev: device pointer | |
90 | * @buf: buffer to return current SQ size parameter | |
91 | * | |
92 | * returns per-connection TCP history queue size parameter | |
93 | */ | |
94 | static ssize_t bnx2i_show_ccell_info(struct device *dev, | |
95 | struct device_attribute *attr, char *buf) | |
96 | { | |
97 | struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); | |
98 | ||
99 | return sprintf(buf, "0x%x\n", hba->num_ccell); | |
100 | } | |
101 | ||
102 | ||
103 | /** | |
104 | * bnx2i_get_link_state - set command cell (HQ) size | |
105 | * @dev: device pointer | |
106 | * @buf: buffer to return current SQ size parameter | |
107 | * @count: parameter buffer size | |
108 | * | |
109 | * updates per-connection TCP history queue size parameter | |
110 | */ | |
111 | static ssize_t bnx2i_set_ccell_info(struct device *dev, | |
112 | struct device_attribute *attr, | |
113 | const char *buf, size_t count) | |
114 | { | |
115 | u32 val; | |
116 | struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); | |
117 | ||
118 | if (hba->ofld_conns_active) | |
119 | goto skip_config; | |
120 | ||
121 | if (sscanf(buf, " 0x%x ", &val) > 0) { | |
122 | if ((val >= BNX2I_CCELLS_MIN) && | |
123 | (val <= BNX2I_CCELLS_MAX)) { | |
124 | hba->num_ccell = val; | |
125 | } | |
126 | } | |
127 | ||
128 | return count; | |
129 | ||
130 | skip_config: | |
131 | printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n"); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | ||
136 | static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR, | |
137 | bnx2i_show_sq_info, bnx2i_set_sq_info); | |
138 | static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR, | |
139 | bnx2i_show_ccell_info, bnx2i_set_ccell_info); | |
140 | ||
141 | struct device_attribute *bnx2i_dev_attributes[] = { | |
142 | &dev_attr_sq_size, | |
143 | &dev_attr_num_ccell, | |
144 | NULL | |
145 | }; |