bnx2i_sysfs.c

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/* 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 ([email protected])
 * Maintained by: Eddie Wai ([email protected])
 */

#include "bnx2i.h"

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);
}


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);
}


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;
}


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);
}


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
};