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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ib_sysctl.c (4096B)

      1/*
      2 * Copyright (c) 2006 Oracle.  All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * licenses.  You may choose to be licensed under the terms of the GNU
      6 * General Public License (GPL) Version 2, available from the file
      7 * COPYING in the main directory of this source tree, or the
      8 * OpenIB.org BSD license below:
      9 *
     10 *     Redistribution and use in source and binary forms, with or
     11 *     without modification, are permitted provided that the following
     12 *     conditions are met:
     13 *
     14 *      - Redistributions of source code must retain the above
     15 *        copyright notice, this list of conditions and the following
     16 *        disclaimer.
     17 *
     18 *      - Redistributions in binary form must reproduce the above
     19 *        copyright notice, this list of conditions and the following
     20 *        disclaimer in the documentation and/or other materials
     21 *        provided with the distribution.
     22 *
     23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     30 * SOFTWARE.
     31 *
     32 */
     33#include <linux/kernel.h>
     34#include <linux/sysctl.h>
     35#include <linux/proc_fs.h>
     36
     37#include "ib.h"
     38
     39static struct ctl_table_header *rds_ib_sysctl_hdr;
     40
     41unsigned long rds_ib_sysctl_max_send_wr = RDS_IB_DEFAULT_SEND_WR;
     42unsigned long rds_ib_sysctl_max_recv_wr = RDS_IB_DEFAULT_RECV_WR;
     43unsigned long rds_ib_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
     44static unsigned long rds_ib_sysctl_max_wr_min = 1;
     45/* hardware will fail CQ creation long before this */
     46static unsigned long rds_ib_sysctl_max_wr_max = (u32)~0;
     47
     48unsigned long rds_ib_sysctl_max_unsig_wrs = 16;
     49static unsigned long rds_ib_sysctl_max_unsig_wr_min = 1;
     50static unsigned long rds_ib_sysctl_max_unsig_wr_max = 64;
     51
     52/*
     53 * This sysctl does nothing.
     54 *
     55 * Backwards compatibility with RDS 3.0 wire protocol
     56 * disables initial FC credit exchange.
     57 * If it's ever possible to drop 3.0 support,
     58 * setting this to 1 and moving init/refill of send/recv
     59 * rings from ib_cm_connect_complete() back into ib_setup_qp()
     60 * will cause credits to be added before protocol negotiation.
     61 */
     62unsigned int rds_ib_sysctl_flow_control = 0;
     63
     64static struct ctl_table rds_ib_sysctl_table[] = {
     65	{
     66		.procname       = "max_send_wr",
     67		.data		= &rds_ib_sysctl_max_send_wr,
     68		.maxlen         = sizeof(unsigned long),
     69		.mode           = 0644,
     70		.proc_handler   = proc_doulongvec_minmax,
     71		.extra1		= &rds_ib_sysctl_max_wr_min,
     72		.extra2		= &rds_ib_sysctl_max_wr_max,
     73	},
     74	{
     75		.procname       = "max_recv_wr",
     76		.data		= &rds_ib_sysctl_max_recv_wr,
     77		.maxlen         = sizeof(unsigned long),
     78		.mode           = 0644,
     79		.proc_handler   = proc_doulongvec_minmax,
     80		.extra1		= &rds_ib_sysctl_max_wr_min,
     81		.extra2		= &rds_ib_sysctl_max_wr_max,
     82	},
     83	{
     84		.procname       = "max_unsignaled_wr",
     85		.data		= &rds_ib_sysctl_max_unsig_wrs,
     86		.maxlen         = sizeof(unsigned long),
     87		.mode           = 0644,
     88		.proc_handler   = proc_doulongvec_minmax,
     89		.extra1		= &rds_ib_sysctl_max_unsig_wr_min,
     90		.extra2		= &rds_ib_sysctl_max_unsig_wr_max,
     91	},
     92	{
     93		.procname       = "max_recv_allocation",
     94		.data		= &rds_ib_sysctl_max_recv_allocation,
     95		.maxlen         = sizeof(unsigned long),
     96		.mode           = 0644,
     97		.proc_handler   = proc_doulongvec_minmax,
     98	},
     99	{
    100		.procname	= "flow_control",
    101		.data		= &rds_ib_sysctl_flow_control,
    102		.maxlen		= sizeof(rds_ib_sysctl_flow_control),
    103		.mode		= 0644,
    104		.proc_handler	= proc_dointvec,
    105	},
    106	{ }
    107};
    108
    109void rds_ib_sysctl_exit(void)
    110{
    111	if (rds_ib_sysctl_hdr)
    112		unregister_net_sysctl_table(rds_ib_sysctl_hdr);
    113}
    114
    115int rds_ib_sysctl_init(void)
    116{
    117	rds_ib_sysctl_hdr = register_net_sysctl(&init_net, "net/rds/ib", rds_ib_sysctl_table);
    118	if (!rds_ib_sysctl_hdr)
    119		return -ENOMEM;
    120	return 0;
    121}