drivers/scsi/bnx2i/bnx2i_sysfs.c

   1 /* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
   2  *
   3  * Copyright (c) 2004 - 2009 Broadcom Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation.
   8  *
   9  * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
  10  */
  11
  12 #include "bnx2i.h"
  13
  14 /**
  15  * bnx2i_dev_to_hba - maps dev pointer to adapter struct
  16  * @dev:        device pointer
  17  *
  18  * Map device to hba structure
  19  */
  20 static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
  21 {
  22         struct Scsi_Host *shost = class_to_shost(dev);
  23         return iscsi_host_priv(shost);
  24 }
  25
  26
  27 /**
  28  * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
  29  * @dev:        device pointer
  30  * @buf:        buffer to return current SQ size parameter
  31  *
  32  * Returns current SQ size parameter, this paramater determines the number
  33  * outstanding iSCSI commands supported on a connection
  34  */
  35 static ssize_t bnx2i_show_sq_info(struct device *dev,
  36                                   struct device_attribute *attr, char *buf)
  37 {
  38         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  39
  40         return sprintf(buf, "0x%x\n", hba->max_sqes);
  41 }
  42
  43
  44 /**
  45  * bnx2i_set_sq_info - update send queue (SQ) size parameter
  46  * @dev:        device pointer
  47  * @buf:        buffer to return current SQ size parameter
  48  * @count:      parameter buffer size
  49  *
  50  * Interface for user to change shared queue size allocated for each conn
  51  * Must be within SQ limits and a power of 2. For the latter this is needed
  52  * because of how libiscsi preallocates tasks.
  53  */
  54 static ssize_t bnx2i_set_sq_info(struct device *dev,
  55                                  struct device_attribute *attr,
  56                                  const char *buf, size_t count)
  57 {
  58         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  59         u32 val;
  60         int max_sq_size;
  61
  62         if (hba->ofld_conns_active)
  63                 goto skip_config;
  64
  65         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
  66                 max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
  67         else
  68                 max_sq_size = BNX2I_570X_SQ_WQES_MAX;
  69
  70         if (sscanf(buf, " 0x%x ", &val) > 0) {
  71                 if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
  72                     (is_power_of_2(val)))
  73                         hba->max_sqes = val;
  74         }
  75
  76         return count;
  77
  78 skip_config:
  79         printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
  80         return 0;
  81 }
  82
  83
  84 /**
  85  * bnx2i_show_ccell_info - returns command cell (HQ) size
  86  * @dev:        device pointer
  87  * @buf:        buffer to return current SQ size parameter
  88  *
  89  * returns per-connection TCP history queue size parameter
  90  */
  91 static ssize_t bnx2i_show_ccell_info(struct device *dev,
  92                                      struct device_attribute *attr, char *buf)
  93 {
  94         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  95
  96         return sprintf(buf, "0x%x\n", hba->num_ccell);
  97 }
  98
  99
 100 /**
 101  * bnx2i_get_link_state - set command cell (HQ) size
 102  * @dev:        device pointer
 103  * @buf:        buffer to return current SQ size parameter
 104  * @count:      parameter buffer size
 105  *
 106  * updates per-connection TCP history queue size parameter
 107  */
 108 static ssize_t bnx2i_set_ccell_info(struct device *dev,
 109                                     struct device_attribute *attr,
 110                                     const char *buf, size_t count)
 111 {
 112         u32 val;
 113         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
 114
 115         if (hba->ofld_conns_active)
 116                 goto skip_config;
 117
 118         if (sscanf(buf, " 0x%x ", &val) > 0) {
 119                 if ((val >= BNX2I_CCELLS_MIN) &&
 120                     (val <= BNX2I_CCELLS_MAX)) {
 121                         hba->num_ccell = val;
 122                 }
 123         }
 124
 125         return count;
 126
 127 skip_config:
 128         printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
 129         return 0;
 130 }
 131
 132
 133 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
 134                    bnx2i_show_sq_info, bnx2i_set_sq_info);
 135 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
 136                    bnx2i_show_ccell_info, bnx2i_set_ccell_info);
 137
 138 struct device_attribute *bnx2i_dev_attributes[] = {
 139         &dev_attr_sq_size,
 140         &dev_attr_num_ccell,
 141         NULL
 142 };