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1/* bnx2i_sysfs.c: QLogic NetXtreme II iSCSI driver.2 *3 * Copyright (c) 2004 - 2013 Broadcom Corporation4 * Copyright (c) 2014, QLogic Corporation5 *6 * This program is free software; you can redistribute it and/or modify7 * it under the terms of the GNU General Public License as published by8 * 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.com13 */14 15#include "bnx2i.h"16 17/**18 * bnx2i_dev_to_hba - maps dev pointer to adapter struct19 * @dev: device pointer20 *21 * Map device to hba structure22 */23static 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) size32 * @dev: device pointer33 * @attr: device attribute (unused)34 * @buf: buffer to return current SQ size parameter35 *36 * Returns current SQ size parameter, this paramater determines the number37 * outstanding iSCSI commands supported on a connection38 */39static 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 parameter50 * @dev: device pointer51 * @attr: device attribute (unused)52 * @buf: buffer to return current SQ size parameter53 * @count: parameter buffer size54 *55 * Interface for user to change shared queue size allocated for each conn56 * Must be within SQ limits and a power of 2. For the latter this is needed57 * because of how libiscsi preallocates tasks.58 */59static 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 else73 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 83skip_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) size91 * @dev: device pointer92 * @attr: device attribute (unused)93 * @buf: buffer to return current SQ size parameter94 *95 * returns per-connection TCP history queue size parameter96 */97static 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) size108 * @dev: device pointer109 * @attr: device attribute (unused)110 * @buf: buffer to return current SQ size parameter111 * @count: parameter buffer size112 *113 * updates per-connection TCP history queue size parameter114 */115static 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 134skip_config:135 printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");136 return 0;137}138 139 140static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,141 bnx2i_show_sq_info, bnx2i_set_sq_info);142static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,143 bnx2i_show_ccell_info, bnx2i_set_ccell_info);144 145static struct attribute *bnx2i_dev_attributes[] = {146 &dev_attr_sq_size.attr,147 &dev_attr_num_ccell.attr,148 NULL149};150 151static const struct attribute_group bnx2i_dev_attr_group = {152 .attrs = bnx2i_dev_attributes153};154 155const struct attribute_group *bnx2i_dev_groups[] = {156 &bnx2i_dev_attr_group,157 NULL158};159