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net/smc: add sysctl for smc_limit_hs

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In commit 48b6190a00 ("net/smc: Limit SMC visits when handshake workqueue congested"),
we introduce a mechanism to put constraint on SMC connections visit
according to the pressure of SMC handshake process.

At that time, we believed that controlling the feature through netlink
was sufficient. However, most people have realized now that netlink is
not convenient in container scenarios, and sysctl is a more suitable
approach.

In addition, since commit 462791bbfa ("net/smc: add sysctl interface for SMC")
had introcuded smc_sysctl_net_init(), it is reasonable for us to
initialize limit_smc_hs in it instead of initializing it in
smc_pnet_net_int().

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
Reviewed-by: Jan Karcher <jaka@linux.ibm.com>
Link: https://patch.msgid.link/1725590135-5631-1-git-send-email-alibuda@linux.alibaba.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
D. Wythe 2024-09-06 10:35:35 +08:00 committed by Paolo Abeni
parent 0246388b9b
commit f8406a2fd2
2 changed files with 11 additions and 3 deletions
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3
net/smc/smc_pnet.c
View file

@ -887,9 +887,6 @@ int smc_pnet_net_init(struct net *net)
smc_pnet_create_pnetids_list(net);
/* disable handshake limitation by default */
net->smc.limit_smc_hs = 0;
return 0;
}

11
net/smc/smc_sysctl.c
View file

@ -90,6 +90,15 @@ static struct ctl_table smc_table[] = {
.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,
},
};
int __net_init smc_sysctl_net_init(struct net *net)
@ -121,6 +130,8 @@ int __net_init smc_sysctl_net_init(struct net *net)
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;
/* disable handshake limitation by default */
net->smc.limit_smc_hs = 0;
return 0;