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net/smc: add sysctl for max conns per lgr for SMC-R v2.1 

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>
This commit is contained in:
Guangguan Wang 2023-11-22 21:52:58 +08:00 committed by David S. Miller
parent f8e80fc4ac
commit 1f2c9dd73f
5 changed files with 23 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/networking/smc-sysctl.rst
View File

@ -65,3 +65,9 @@ smcr_max_links_per_lgr - INTEGER
for SMC-R v2.1 and later.
Default: 2
smcr_max_conns_per_lgr - INTEGER
Controls the max number of connections can be added to a SMC-R link group. The
acceptable value ranges from 16 to 255. Only for SMC-R v2.1 and later.
Default: 255

1
include/net/netns/smc.h
View File

@ -23,5 +23,6 @@ struct netns_smc {
int sysctl_wmem;
int sysctl_rmem;
int sysctl_max_links_per_lgr;
int sysctl_max_conns_per_lgr;
};
#endif

5
net/smc/smc_clc.c
View File

@ -944,7 +944,7 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
}
if (smcr_indicated(ini->smc_type_v2)) {
memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
v2_ext->max_conns = SMC_CONN_PER_LGR_PREFER;
v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr;
v2_ext->max_links = net->smc.sysctl_max_links_per_lgr;
}
@ -1191,7 +1191,8 @@ int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
return SMC_CLC_DECL_NOV2EXT;
if (ini->smcr_version & SMC_V2) {
ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, SMC_CONN_PER_LGR_PREFER);
ini->max_conns = min_t(u8, pclc_v2_ext->max_conns,
net->smc.sysctl_max_conns_per_lgr);
if (ini->max_conns < SMC_CONN_PER_LGR_MIN)
return SMC_CLC_DECL_MAXCONNERR;

12
net/smc/smc_sysctl.c
View File

@ -27,6 +27,8 @@ 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 struct ctl_table smc_table[] = {
{
@ -79,6 +81,15 @@ static struct ctl_table smc_table[] = {
.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,
},
{ }
};
@ -109,6 +120,7 @@ int __net_init smc_sysctl_net_init(struct net *net)
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;
return 0;

1
net/smc/smc_sysctl.h
View File

@ -24,6 +24,7 @@ static inline int smc_sysctl_net_init(struct net *net)
{
net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
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;
return 0;
}