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1f2c9dd73f
Add a new sysctl: net.smc.smcr_max_conns_per_lgr, which is used to control the preferred max connections per lgr for SMC-R v2.1. The default value of this sysctl is 255, and the acceptable value ranges from 16 to 255. Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com> Reviewed-by: Dust Li <dust.li@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* smc_sysctl.c: sysctl interface to SMC subsystem.
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*
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* Copyright (c) 2022, Alibaba Inc.
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*
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* Author: Tony Lu <tonylu@linux.alibaba.com>
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*
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*/
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <net/net_namespace.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_llc.h"
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#include "smc_sysctl.h"
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static int min_sndbuf = SMC_BUF_MIN_SIZE;
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static int min_rcvbuf = SMC_BUF_MIN_SIZE;
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static int max_sndbuf = INT_MAX / 2;
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static int max_rcvbuf = INT_MAX / 2;
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static const int net_smc_wmem_init = (64 * 1024);
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static const int net_smc_rmem_init = (64 * 1024);
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static int links_per_lgr_min = SMC_LINKS_ADD_LNK_MIN;
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static int links_per_lgr_max = SMC_LINKS_ADD_LNK_MAX;
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static int conns_per_lgr_min = SMC_CONN_PER_LGR_MIN;
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static int conns_per_lgr_max = SMC_CONN_PER_LGR_MAX;
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static struct ctl_table smc_table[] = {
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{
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.procname = "autocorking_size",
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.data = &init_net.smc.sysctl_autocorking_size,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_douintvec,
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},
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{
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.procname = "smcr_buf_type",
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.data = &init_net.smc.sysctl_smcr_buf_type,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_douintvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_TWO,
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},
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{
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.procname = "smcr_testlink_time",
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.data = &init_net.smc.sysctl_smcr_testlink_time,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "wmem",
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.data = &init_net.smc.sysctl_wmem,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_sndbuf,
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.extra2 = &max_sndbuf,
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},
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{
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.procname = "rmem",
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.data = &init_net.smc.sysctl_rmem,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_rcvbuf,
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.extra2 = &max_rcvbuf,
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},
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{
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.procname = "smcr_max_links_per_lgr",
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.data = &init_net.smc.sysctl_max_links_per_lgr,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &links_per_lgr_min,
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.extra2 = &links_per_lgr_max,
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},
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{
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.procname = "smcr_max_conns_per_lgr",
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.data = &init_net.smc.sysctl_max_conns_per_lgr,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &conns_per_lgr_min,
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.extra2 = &conns_per_lgr_max,
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},
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{ }
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};
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int __net_init smc_sysctl_net_init(struct net *net)
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{
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struct ctl_table *table;
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table = smc_table;
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if (!net_eq(net, &init_net)) {
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int i;
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table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
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if (!table)
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goto err_alloc;
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for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
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table[i].data += (void *)net - (void *)&init_net;
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}
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net->smc.smc_hdr = register_net_sysctl_sz(net, "net/smc", table,
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ARRAY_SIZE(smc_table));
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if (!net->smc.smc_hdr)
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goto err_reg;
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net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
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net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
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net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
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WRITE_ONCE(net->smc.sysctl_wmem, net_smc_wmem_init);
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WRITE_ONCE(net->smc.sysctl_rmem, net_smc_rmem_init);
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net->smc.sysctl_max_links_per_lgr = SMC_LINKS_PER_LGR_MAX_PREFER;
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net->smc.sysctl_max_conns_per_lgr = SMC_CONN_PER_LGR_PREFER;
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return 0;
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err_reg:
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if (!net_eq(net, &init_net))
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kfree(table);
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err_alloc:
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return -ENOMEM;
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}
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void __net_exit smc_sysctl_net_exit(struct net *net)
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{
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struct ctl_table *table;
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table = net->smc.smc_hdr->ctl_table_arg;
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unregister_net_sysctl_table(net->smc.smc_hdr);
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if (!net_eq(net, &init_net))
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kfree(table);
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}
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