1 /* bnx2i_sysfs.c: QLogic NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2004 - 2013 Broadcom Corporation 4 * Copyright (c) 2014, QLogic Corporation 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) 11 * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com) 12 * Maintained by: QLogic-Storage-Upstream@qlogic.com 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 * @attr: device attribute (unused) 34 * @buf: buffer to return current SQ size parameter 35 * 36 * Returns current SQ size parameter, this paramater determines the number 37 * outstanding iSCSI commands supported on a connection 38 */ 39 static ssize_t bnx2i_show_sq_info(struct device *dev, 40 struct device_attribute *attr, char *buf) 41 { 42 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 43 44 return sprintf(buf, "0x%x\n", hba->max_sqes); 45 } 46 47 48 /** 49 * bnx2i_set_sq_info - update send queue (SQ) size parameter 50 * @dev: device pointer 51 * @attr: device attribute (unused) 52 * @buf: buffer to return current SQ size parameter 53 * @count: parameter buffer size 54 * 55 * Interface for user to change shared queue size allocated for each conn 56 * Must be within SQ limits and a power of 2. For the latter this is needed 57 * because of how libiscsi preallocates tasks. 58 */ 59 static ssize_t bnx2i_set_sq_info(struct device *dev, 60 struct device_attribute *attr, 61 const char *buf, size_t count) 62 { 63 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 64 u32 val; 65 int max_sq_size; 66 67 if (hba->ofld_conns_active) 68 goto skip_config; 69 70 if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) 71 max_sq_size = BNX2I_5770X_SQ_WQES_MAX; 72 else 73 max_sq_size = BNX2I_570X_SQ_WQES_MAX; 74 75 if (sscanf(buf, " 0x%x ", &val) > 0) { 76 if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) && 77 (is_power_of_2(val))) 78 hba->max_sqes = val; 79 } 80 81 return count; 82 83 skip_config: 84 printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n"); 85 return 0; 86 } 87 88 89 /** 90 * bnx2i_show_ccell_info - returns command cell (HQ) size 91 * @dev: device pointer 92 * @attr: device attribute (unused) 93 * @buf: buffer to return current SQ size parameter 94 * 95 * returns per-connection TCP history queue size parameter 96 */ 97 static ssize_t bnx2i_show_ccell_info(struct device *dev, 98 struct device_attribute *attr, char *buf) 99 { 100 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 101 102 return sprintf(buf, "0x%x\n", hba->num_ccell); 103 } 104 105 106 /** 107 * bnx2i_set_ccell_info - set command cell (HQ) size 108 * @dev: device pointer 109 * @attr: device attribute (unused) 110 * @buf: buffer to return current SQ size parameter 111 * @count: parameter buffer size 112 * 113 * updates per-connection TCP history queue size parameter 114 */ 115 static ssize_t bnx2i_set_ccell_info(struct device *dev, 116 struct device_attribute *attr, 117 const char *buf, size_t count) 118 { 119 u32 val; 120 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 121 122 if (hba->ofld_conns_active) 123 goto skip_config; 124 125 if (sscanf(buf, " 0x%x ", &val) > 0) { 126 if ((val >= BNX2I_CCELLS_MIN) && 127 (val <= BNX2I_CCELLS_MAX)) { 128 hba->num_ccell = val; 129 } 130 } 131 132 return count; 133 134 skip_config: 135 printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n"); 136 return 0; 137 } 138 139 140 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR, 141 bnx2i_show_sq_info, bnx2i_set_sq_info); 142 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR, 143 bnx2i_show_ccell_info, bnx2i_set_ccell_info); 144 145 struct device_attribute *bnx2i_dev_attributes[] = { 146 &dev_attr_sq_size, 147 &dev_attr_num_ccell, 148 NULL 149 }; 150