cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bnx2i_sysfs.c (4126B)

      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 * @attr:	device attribute (unused)
     34 * @buf:	buffer to return current SQ size parameter
     35 *
     36 * Returns current SQ size parameter, this paramater determines the number
     37 * outstanding iSCSI commands supported on a connection
     38 */
     39static ssize_t bnx2i_show_sq_info(struct device *dev,
     40				  struct device_attribute *attr, char *buf)
     41{
     42	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
     43
     44	return sprintf(buf, "0x%x\n", hba->max_sqes);
     45}
     46
     47
     48/**
     49 * bnx2i_set_sq_info - update send queue (SQ) size parameter
     50 * @dev:	device pointer
     51 * @attr:	device attribute (unused)
     52 * @buf:	buffer to return current SQ size parameter
     53 * @count:	parameter buffer size
     54 *
     55 * Interface for user to change shared queue size allocated for each conn
     56 * Must be within SQ limits and a power of 2. For the latter this is needed
     57 * because of how libiscsi preallocates tasks.
     58 */
     59static ssize_t bnx2i_set_sq_info(struct device *dev,
     60				 struct device_attribute *attr,
     61				 const char *buf, size_t count)
     62{
     63	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
     64	u32 val;
     65	int max_sq_size;
     66
     67	if (hba->ofld_conns_active)
     68		goto skip_config;
     69
     70	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
     71		max_sq_size = BNX2I_5770X_SQ_WQES_MAX;
     72	else
     73		max_sq_size = BNX2I_570X_SQ_WQES_MAX;
     74
     75	if (sscanf(buf, " 0x%x ", &val) > 0) {
     76		if ((val >= BNX2I_SQ_WQES_MIN) && (val <= max_sq_size) &&
     77		    (is_power_of_2(val)))
     78			hba->max_sqes = val;
     79	}
     80
     81	return count;
     82
     83skip_config:
     84	printk(KERN_ERR "bnx2i: device busy, cannot change SQ size\n");
     85	return 0;
     86}
     87
     88
     89/**
     90 * bnx2i_show_ccell_info - returns command cell (HQ) size
     91 * @dev:	device pointer
     92 * @attr:	device attribute (unused)
     93 * @buf:	buffer to return current SQ size parameter
     94 *
     95 * returns per-connection TCP history queue size parameter
     96 */
     97static ssize_t bnx2i_show_ccell_info(struct device *dev,
     98				     struct device_attribute *attr, char *buf)
     99{
    100	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
    101
    102	return sprintf(buf, "0x%x\n", hba->num_ccell);
    103}
    104
    105
    106/**
    107 * bnx2i_set_ccell_info - set command cell (HQ) size
    108 * @dev:	device pointer
    109 * @attr:	device attribute (unused)
    110 * @buf:	buffer to return current SQ size parameter
    111 * @count:	parameter buffer size
    112 *
    113 * updates per-connection TCP history queue size parameter
    114 */
    115static ssize_t bnx2i_set_ccell_info(struct device *dev,
    116				    struct device_attribute *attr,
    117				    const char *buf, size_t count)
    118{
    119	u32 val;
    120	struct bnx2i_hba *hba = bnx2i_dev_to_hba(dev);
    121
    122	if (hba->ofld_conns_active)
    123		goto skip_config;
    124
    125	if (sscanf(buf, " 0x%x ", &val) > 0) {
    126		if ((val >= BNX2I_CCELLS_MIN) &&
    127		    (val <= BNX2I_CCELLS_MAX)) {
    128			hba->num_ccell = val;
    129		}
    130	}
    131
    132	return count;
    133
    134skip_config:
    135	printk(KERN_ERR "bnx2i: device busy, cannot change CCELL size\n");
    136	return 0;
    137}
    138
    139
    140static DEVICE_ATTR(sq_size, S_IRUGO | S_IWUSR,
    141		   bnx2i_show_sq_info, bnx2i_set_sq_info);
    142static DEVICE_ATTR(num_ccell, S_IRUGO | S_IWUSR,
    143		   bnx2i_show_ccell_info, bnx2i_set_ccell_info);
    144
    145static struct attribute *bnx2i_dev_attributes[] = {
    146	&dev_attr_sq_size.attr,
    147	&dev_attr_num_ccell.attr,
    148	NULL
    149};
    150
    151static const struct attribute_group bnx2i_dev_attr_group = {
    152	.attrs = bnx2i_dev_attributes
    153};
    154
    155const struct attribute_group *bnx2i_dev_groups[] = {
    156	&bnx2i_dev_attr_group,
    157	NULL
    158};