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 * @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 }; 146