[mirror_ubuntu-artful-kernel.git] / drivers / scsi / bnx2i / bnx2i_sysfs.c

/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
 *
 * Copyright (c) 2004 - 2012 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
 * Maintained by: Eddie Wai (eddie.wai@broadcom.com)
 */

#include "bnx2i.h"

/**
 * bnx2i_dev_to_hba - maps dev pointer to adapter struct
 * @dev:	device pointer
 *
 * Map device to hba structure
 */
static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	return iscsi_host_priv(shost);
}


/**
 * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 *
 * Returns current SQ size parameter, this paramater determines the number
 * outstanding iSCSI commands supported on a connection
 */
static ssize_t bnx2i_show_sq_info(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	return sprintf(buf, "0x%x\n", hba->max_sqes);
}


/**
 * bnx2i_set_sq_info - update send queue (SQ) size parameter
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 * @count:	parameter buffer size
 *
 * Interface for user to change shared queue size allocated for each conn
 * Must be within SQ limits and a power of 2. For the latter this is needed
 * because of how libiscsi preallocates tasks.
 */
static ssize_t bnx2i_set_sq_info(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
	u32 val;
	int max_sq_size;

	if (hba->ofld_conns_active)
		goto skip_config;

	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
		max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
	else
		max_sq_size = BNX2I_570X_SQ_WQES_MAX;

	if (sscanf(buf, " 0x%x ", &val) > 0) {
		if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
		    (is_power_of_2(val)))
			hba->max_sqes = val;
	}

	return count;

skip_config:
	printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
	return 0;
}


/**
 * bnx2i_show_ccell_info - returns command cell (HQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 *
 * returns per-connection TCP history queue size parameter
 */
static ssize_t bnx2i_show_ccell_info(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	return sprintf(buf, "0x%x\n", hba->num_ccell);
}


/**
 * bnx2i_get_link_state - set command cell (HQ) size
 * @dev:	device pointer
 * @buf:	buffer to return current SQ size parameter
 * @count:	parameter buffer size
 *
 * updates per-connection TCP history queue size parameter
 */
static ssize_t bnx2i_set_ccell_info(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	u32 val;
	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);

	if (hba->ofld_conns_active)
		goto skip_config;

	if (sscanf(buf, " 0x%x ", &val) > 0) {
		if ((val >= BNX2I_CCELLS_MIN) &&
		    (val <= BNX2I_CCELLS_MAX)) {
			hba->num_ccell = val;
		}
	}

	return count;

skip_config:
	printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
	return 0;
}


static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
		   bnx2i_show_sq_info, bnx2i_set_sq_info);
static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
		   bnx2i_show_ccell_info, bnx2i_set_ccell_info);

struct device_attribute *bnx2i_dev_attributes[] = {
	&dev_attr_sq_size,
	&dev_attr_num_ccell,
	NULL
};
Commit	Line	Data
cf4e6363 MC	1	/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
cf4e6363 MC	2	*
9ebd99c5	3	* Copyright (c) 2004 - 2012 Broadcom Corporation
cf4e6363 MC	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)
11cec1e2	10	* Maintained by: Eddie Wai (eddie.wai@broadcom.com)
cf4e6363 MC	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	};