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/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
*
* Copyright (c) 2004 - 2011 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
};
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