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