LXR linux/drivers/scsi/bnx2i/bnx2i

   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 * @buf:        buffer to return current SQ size parameter
  34 *
  35 * Returns current SQ size parameter, this paramater determines the number
  36 * outstanding iSCSI commands supported on a connection
  37 */
  38static ssize_t bnx2i_show_sq_info(struct device *dev,
  39                                  struct device_attribute *attr, char *buf)
  40{
  41        struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  42
  43        return sprintf(buf, "0x%x\n", hba->max_sqes);
  44}
  45
  46
  47/**
  48 * bnx2i_set_sq_info - update send queue (SQ) size parameter
  49 * @dev:        device pointer
  50 * @buf:        buffer to return current SQ size parameter
  51 * @count:      parameter buffer size
  52 *
  53 * Interface for user to change shared queue size allocated for each conn
  54 * Must be within SQ limits and a power of 2. For the latter this is needed
  55 * because of how libiscsi preallocates tasks.
  56 */
  57static ssize_t bnx2i_set_sq_info(struct device *dev,
  58                                 struct device_attribute *attr,
  59                                 const char *buf, size_t count)
  60{
  61        struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  62        u32 val;
  63        int max_sq_size;
  64
  65        if (hba->ofld_conns_active)
  66                goto skip_config;
  67
  68        if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
  69                max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
  70        else
  71                max_sq_size = BNX2I_570X_SQ_WQES_MAX;
  72
  73        if (sscanf(buf, " 0x%x ", &val) > 0) {
  74                if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
  75                    (is_power_of_2(val)))
  76                        hba->max_sqes = val;
  77        }
  78
  79        return count;
  80
  81skip_config:
  82        printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
  83        return 0;
  84}
  85
  86
  87/**
  88 * bnx2i_show_ccell_info - returns command cell (HQ) size
  89 * @dev:        device pointer
  90 * @buf:        buffer to return current SQ size parameter
  91 *
  92 * returns per-connection TCP history queue size parameter
  93 */
  94static ssize_t bnx2i_show_ccell_info(struct device *dev,
  95                                     struct device_attribute *attr, char *buf)
  96{
  97        struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  98
  99        return sprintf(buf, "0x%x\n", hba->num_ccell);
 100}
 101
 102
 103/**
 104 * bnx2i_get_link_state - set command cell (HQ) size
 105 * @dev:        device pointer
 106 * @buf:        buffer to return current SQ size parameter
 107 * @count:      parameter buffer size
 108 *
 109 * updates per-connection TCP history queue size parameter
 110 */
 111static ssize_t bnx2i_set_ccell_info(struct device *dev,
 112                                    struct device_attribute *attr,
 113                                    const char *buf, size_t count)
 114{
 115        u32 val;
 116        struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
 117
 118        if (hba->ofld_conns_active)
 119                goto skip_config;
 120
 121        if (sscanf(buf, " 0x%x ", &val) > 0) {
 122                if ((val >= BNX2I_CCELLS_MIN) &&
 123                    (val <= BNX2I_CCELLS_MAX)) {
 124                        hba->num_ccell = val;
 125                }
 126        }
 127
 128        return count;
 129
 130skip_config:
 131        printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
 132        return 0;
 133}
 134
 135
 136static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
 137                   bnx2i_show_sq_info, bnx2i_set_sq_info);
 138static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
 139                   bnx2i_show_ccell_info, bnx2i_set_ccell_info);
 140
 141struct device_attribute *bnx2i_dev_attributes[] = {
 142        &dev_attr_sq_size,
 143        &dev_attr_num_ccell,
 144        NULL
 145};
 146