drivers/scsi/bnx2i/bnx2i_sysfs.c

   1 /* bnx2i_sysfs.c: Broadcom NetXtreme II iSCSI driver.
   2  *
   3  * Copyright (c) 2004 - 2010 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  * Maintained by: Eddie Wai (eddie.wai@broadcom.com)
  11  */
  12
  13 #include "bnx2i.h"
  14
  15 /**
  16  * bnx2i_dev_to_hba - maps dev pointer to adapter struct
  17  * @dev:        device pointer
  18  *
  19  * Map device to hba structure
  20  */
  21 static inline struct bnx2i_hba *bnx2i_dev_to_hba(struct device *dev)
  22 {
  23         struct Scsi_Host *shost = class_to_shost(dev);
  24         return iscsi_host_priv(shost);
  25 }
  26
  27
  28 /**
  29  * bnx2i_show_sq_info - return(s currently configured send queue (SQ) size
  30  * @dev:        device pointer
  31  * @buf:        buffer to return current SQ size parameter
  32  *
  33  * Returns current SQ size parameter, this paramater determines the number
  34  * outstanding iSCSI commands supported on a connection
  35  */
  36 static ssize_t bnx2i_show_sq_info(struct device *dev,
  37                                   struct device_attribute *attr, char *buf)
  38 {
  39         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  40
  41         return sprintf(buf, "0x%x\n", hba->max_sqes);
  42 }
  43
  44
  45 /**
  46  * bnx2i_set_sq_info - update send queue (SQ) size parameter
  47  * @dev:        device pointer
  48  * @buf:        buffer to return current SQ size parameter
  49  * @count:      parameter buffer size
  50  *
  51  * Interface for user to change shared queue size allocated for each conn
  52  * Must be within SQ limits and a power of 2. For the latter this is needed
  53  * because of how libiscsi preallocates tasks.
  54  */
  55 static ssize_t bnx2i_set_sq_info(struct device *dev,
  56                                  struct device_attribute *attr,
  57                                  const char *buf, size_t count)
  58 {
  59         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  60         u32 val;
  61         int max_sq_size;
  62
  63         if (hba->ofld_conns_active)
  64                 goto skip_config;
  65
  66         if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
  67                 max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
  68         else
  69                 max_sq_size = BNX2I_570X_SQ_WQES_MAX;
  70
  71         if (sscanf(buf, " 0x%x ", &val) > 0) {
  72                 if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
  73                     (is_power_of_2(val)))
  74                         hba->max_sqes = val;
  75         }
  76
  77         return count;
  78
  79 skip_config:
  80         printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
  81         return 0;
  82 }
  83
  84
  85 /**
  86  * bnx2i_show_ccell_info - returns command cell (HQ) size
  87  * @dev:        device pointer
  88  * @buf:        buffer to return current SQ size parameter
  89  *
  90  * returns per-connection TCP history queue size parameter
  91  */
  92 static ssize_t bnx2i_show_ccell_info(struct device *dev,
  93                                      struct device_attribute *attr, char *buf)
  94 {
  95         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
  96
  97         return sprintf(buf, "0x%x\n", hba->num_ccell);
  98 }
  99
 100
 101 /**
 102  * bnx2i_get_link_state - set command cell (HQ) size
 103  * @dev:        device pointer
 104  * @buf:        buffer to return current SQ size parameter
 105  * @count:      parameter buffer size
 106  *
 107  * updates per-connection TCP history queue size parameter
 108  */
 109 static ssize_t bnx2i_set_ccell_info(struct device *dev,
 110                                     struct device_attribute *attr,
 111                                     const char *buf, size_t count)
 112 {
 113         u32 val;
 114         struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
 115
 116         if (hba->ofld_conns_active)
 117                 goto skip_config;
 118
 119         if (sscanf(buf, " 0x%x ", &val) > 0) {
 120                 if ((val >= BNX2I_CCELLS_MIN) &&
 121                     (val <= BNX2I_CCELLS_MAX)) {
 122                         hba->num_ccell = val;
 123                 }
 124         }
 125
 126         return count;
 127
 128 skip_config:
 129         printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
 130         return 0;
 131 }
 132
 133
 134 static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
 135                    bnx2i_show_sq_info, bnx2i_set_sq_info);
 136 static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
 137                    bnx2i_show_ccell_info, bnx2i_set_ccell_info);
 138
 139 struct device_attribute *bnx2i_dev_attributes[] = {
 140         &dev_attr_sq_size,
 141         &dev_attr_num_ccell,
 142         NULL
 143 };