/* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver. | |
* | |
* Copyright (c) 2004 - 2008 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) | |
*/ | |
#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 | |
}; |