1 /* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2004 - 2010 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 * Maintained by: Eddie Wai (eddie.wai@broadcom.com) 11 */ 12 13 #include "bnx2i.h" 14 15 /** 16 * bnx2i_dev_to_hba - maps dev pointer to adapter struct 17 * @dev: device pointer 18 * 19 * Map device to hba structure 20 */ 21 static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev) 22 { 23 struct Scsi_Host *shost = class_to_shost(dev); 24 return iscsi_host_priv(shost); 25 } 26 27 28 /** 29 * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size 30 * @dev: device pointer 31 * @buf: buffer to return current SQ size parameter 32 * 33 * Returns current SQ size parameter, this paramater determines the number 34 * outstanding iSCSI commands supported on a connection 35 */ 36 static ssize_t bnx2i_show_sq_info(struct device *dev, 37 struct device_attribute *attr, char *buf) 38 { 39 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 40 41 return sprintf(buf, "0x%x\n", hba->max_sqes); 42 } 43 44 45 /** 46 * bnx2i_set_sq_info - update send queue (SQ) size parameter 47 * @dev: device pointer 48 * @buf: buffer to return current SQ size parameter 49 * @count: parameter buffer size 50 * 51 * Interface for user to change shared queue size allocated for each conn 52 * Must be within SQ limits and a power of 2. For the latter this is needed 53 * because of how libiscsi preallocates tasks. 54 */ 55 static ssize_t bnx2i_set_sq_info(struct device *dev, 56 struct device_attribute *attr, 57 const char *buf, size_t count) 58 { 59 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 60 u32 val; 61 int max_sq_size; 62 63 if (hba->ofld_conns_active) 64 goto skip_config; 65 66 if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) 67 max_sq_size = BNX2I_5770X_SQ_WQES_MAX; 68 else 69 max_sq_size = BNX2I_570X_SQ_WQES_MAX; 70 71 if (sscanf(buf, " 0x%x ", &val) > 0) { 72 if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) && 73 (is_power_of_2(val))) 74 hba->max_sqes = val; 75 } 76 77 return count; 78 79 skip_config: 80 printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n"); 81 return 0; 82 } 83 84 85 /** 86 * bnx2i_show_ccell_info - returns command cell (HQ) size 87 * @dev: device pointer 88 * @buf: buffer to return current SQ size parameter 89 * 90 * returns per-connection TCP history queue size parameter 91 */ 92 static ssize_t bnx2i_show_ccell_info(struct device *dev, 93 struct device_attribute *attr, char *buf) 94 { 95 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 96 97 return sprintf(buf, "0x%x\n", hba->num_ccell); 98 } 99 100 101 /** 102 * bnx2i_get_link_state - set command cell (HQ) size 103 * @dev: device pointer 104 * @buf: buffer to return current SQ size parameter 105 * @count: parameter buffer size 106 * 107 * updates per-connection TCP history queue size parameter 108 */ 109 static ssize_t bnx2i_set_ccell_info(struct device *dev, 110 struct device_attribute *attr, 111 const char *buf, size_t count) 112 { 113 u32 val; 114 struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev); 115 116 if (hba->ofld_conns_active) 117 goto skip_config; 118 119 if (sscanf(buf, " 0x%x ", &val) > 0) { 120 if ((val >= BNX2I_CCELLS_MIN) && 121 (val <= BNX2I_CCELLS_MAX)) { 122 hba->num_ccell = val; 123 } 124 } 125 126 return count; 127 128 skip_config: 129 printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n"); 130 return 0; 131 } 132 133 134 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR, 135 bnx2i_show_sq_info, bnx2i_set_sq_info); 136 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR, 137 bnx2i_show_ccell_info, bnx2i_set_ccell_info); 138 139 struct device_attribute *bnx2i_dev_attributes[] = { 140 &dev_attr_sq_size, 141 &dev_attr_num_ccell, 142 NULL 143 }; 144