| Michael Chan | cf4e636 | 2009-06-08 18:14:44 -0700 | [diff] [blame] | 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 | }; |