bnx2i_sysfs.c

  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 */
 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) 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 */
 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 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 */
 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	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
 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) 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 */
 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) 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 */
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	NULL
149};
150
151static const struct attribute_group bnx2i_dev_attr_group = {
152	.attrs = bnx2i_dev_attributes
153};
154
155const struct attribute_group *bnx2i_dev_groups[] = {
156	&bnx2i_dev_attr_group,
157	NULL
158};