drivers/scsi/bnx2i/bnx2i_sysfs.c

   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  */
  23 static 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  */
  38 static 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  */
  57 static 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
  81 skip_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  */
  94 static 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  */
 111 static 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
 130 skip_config:
 131         printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
 132         return 0;
 133 }
 134
 135
 136 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
 137                    bnx2i_show_sq_info, bnx2i_set_sq_info);
 138 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
 139                    bnx2i_show_ccell_info, bnx2i_set_ccell_info);
 140
 141 struct device_attribute *bnx2i_dev_attributes[] = {
 142         &dev_attr_sq_size,
 143         &dev_attr_num_ccell,
 144         NULL
 145 };