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// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* smc_sysctl.c: sysctl interface to SMC subsystem.
*
* Copyright (c) 2022, Alibaba Inc.
*
* Author: Tony Lu <tonylu@linux.alibaba.com>
*
*/
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/bpf.h>
#include <net/net_namespace.h>
#include "smc.h"
#include "smc_core.h"
#include "smc_llc.h"
#include "smc_sysctl.h"
#include "smc_hs_bpf.h"
static int min_sndbuf = SMC_BUF_MIN_SIZE;
static int min_rcvbuf = SMC_BUF_MIN_SIZE;
static int max_sndbuf = INT_MAX / 2;
static int max_rcvbuf = INT_MAX / 2;
static const int net_smc_wmem_init = (64 * 1024);
static const int net_smc_rmem_init = (64 * 1024);
static int links_per_lgr_min = SMC_LINKS_ADD_LNK_MIN;
static int links_per_lgr_max = SMC_LINKS_ADD_LNK_MAX;
static int conns_per_lgr_min = SMC_CONN_PER_LGR_MIN;
static int conns_per_lgr_max = SMC_CONN_PER_LGR_MAX;
static unsigned int smcr_max_wr_min = 2;
static unsigned int smcr_max_wr_max = 2048;
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
static int smc_net_replace_smc_hs_ctrl(struct net *net, const char *name)
{
struct smc_hs_ctrl *ctrl = NULL;
rcu_read_lock();
/* null or empty name ask to clear current ctrl */
if (name && name[0]) {
ctrl = smc_hs_ctrl_find_by_name(name);
if (!ctrl) {
rcu_read_unlock();
return -EINVAL;
}
/* no change, just return */
if (ctrl == rcu_dereference(net->smc.hs_ctrl)) {
rcu_read_unlock();
return 0;
}
if (!bpf_try_module_get(ctrl, ctrl->owner)) {
rcu_read_unlock();
return -EBUSY;
}
}
/* xhcg old ctrl with the new one atomically */
ctrl = unrcu_pointer(xchg(&net->smc.hs_ctrl, RCU_INITIALIZER(ctrl)));
/* release old ctrl */
if (ctrl)
bpf_module_put(ctrl, ctrl->owner);
rcu_read_unlock();
return 0;
}
static int proc_smc_hs_ctrl(const struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct net *net = container_of(ctl->data, struct net, smc.hs_ctrl);
char val[SMC_HS_CTRL_NAME_MAX];
const struct ctl_table tbl = {
.data = val,
.maxlen = SMC_HS_CTRL_NAME_MAX,
};
struct smc_hs_ctrl *ctrl;
int ret;
rcu_read_lock();
ctrl = rcu_dereference(net->smc.hs_ctrl);
if (ctrl)
memcpy(val, ctrl->name, sizeof(ctrl->name));
else
val[0] = '\0';
rcu_read_unlock();
ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
if (ret)
return ret;
if (write)
ret = smc_net_replace_smc_hs_ctrl(net, val);
return ret;
}
#endif /* CONFIG_SMC_HS_CTRL_BPF */
static struct ctl_table smc_table[] = {
{
.procname = "autocorking_size",
.data = &init_net.smc.sysctl_autocorking_size,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec,
},
{
.procname = "smcr_buf_type",
.data = &init_net.smc.sysctl_smcr_buf_type,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{
.procname = "smcr_testlink_time",
.data = &init_net.smc.sysctl_smcr_testlink_time,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "wmem",
.data = &init_net.smc.sysctl_wmem,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_sndbuf,
.extra2 = &max_sndbuf,
},
{
.procname = "rmem",
.data = &init_net.smc.sysctl_rmem,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_rcvbuf,
.extra2 = &max_rcvbuf,
},
{
.procname = "smcr_max_links_per_lgr",
.data = &init_net.smc.sysctl_max_links_per_lgr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &links_per_lgr_min,
.extra2 = &links_per_lgr_max,
},
{
.procname = "smcr_max_conns_per_lgr",
.data = &init_net.smc.sysctl_max_conns_per_lgr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &conns_per_lgr_min,
.extra2 = &conns_per_lgr_max,
},
{
.procname = "limit_smc_hs",
.data = &init_net.smc.limit_smc_hs,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
{
.procname = "smcr_max_send_wr",
.data = &init_net.smc.sysctl_smcr_max_send_wr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &smcr_max_wr_min,
.extra2 = &smcr_max_wr_max,
},
{
.procname = "smcr_max_recv_wr",
.data = &init_net.smc.sysctl_smcr_max_recv_wr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &smcr_max_wr_min,
.extra2 = &smcr_max_wr_max,
},
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
{
.procname = "hs_ctrl",
.data = &init_net.smc.hs_ctrl,
.mode = 0644,
.maxlen = SMC_HS_CTRL_NAME_MAX,
.proc_handler = proc_smc_hs_ctrl,
},
#endif /* CONFIG_SMC_HS_CTRL_BPF */
};
int __net_init smc_sysctl_net_init(struct net *net)
{
size_t table_size = ARRAY_SIZE(smc_table);
struct ctl_table *table;
table = smc_table;
if (!net_eq(net, &init_net)) {
int i;
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
struct smc_hs_ctrl *ctrl;
rcu_read_lock();
ctrl = rcu_dereference(init_net.smc.hs_ctrl);
if (ctrl && ctrl->flags & SMC_HS_CTRL_FLAG_INHERITABLE &&
bpf_try_module_get(ctrl, ctrl->owner))
rcu_assign_pointer(net->smc.hs_ctrl, ctrl);
rcu_read_unlock();
#endif /* CONFIG_SMC_HS_CTRL_BPF */
table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
if (!table)
goto err_alloc;
for (i = 0; i < table_size; i++)
table[i].data += (void *)net - (void *)&init_net;
}
net->smc.smc_hdr = register_net_sysctl_sz(net, "net/smc", table,
table_size);
if (!net->smc.smc_hdr)
goto err_reg;
net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
WRITE_ONCE(net->smc.sysctl_wmem, net_smc_wmem_init);
WRITE_ONCE(net->smc.sysctl_rmem, net_smc_rmem_init);
net->smc.sysctl_max_links_per_lgr = SMC_LINKS_PER_LGR_MAX_PREFER;
net->smc.sysctl_max_conns_per_lgr = SMC_CONN_PER_LGR_PREFER;
net->smc.sysctl_smcr_max_send_wr = SMCR_MAX_SEND_WR_DEF;
net->smc.sysctl_smcr_max_recv_wr = SMCR_MAX_RECV_WR_DEF;
/* disable handshake limitation by default */
net->smc.limit_smc_hs = 0;
return 0;
err_reg:
if (!net_eq(net, &init_net))
kfree(table);
err_alloc:
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
smc_net_replace_smc_hs_ctrl(net, NULL);
#endif /* CONFIG_SMC_HS_CTRL_BPF */
return -ENOMEM;
}
void __net_exit smc_sysctl_net_exit(struct net *net)
{
const struct ctl_table *table;
table = net->smc.smc_hdr->ctl_table_arg;
unregister_net_sysctl_table(net->smc.smc_hdr);
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
smc_net_replace_smc_hs_ctrl(net, NULL);
#endif /* CONFIG_SMC_HS_CTRL_BPF */
if (!net_eq(net, &init_net))
kfree(table);
}
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