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

Add a new sysctl: net.smc.smcr_max_links_per_lgr, which is
used to control the preferred max links per lgr for SMC-R
v2.1. The default value of this sysctl is 2, and the acceptable
value ranges from 1 to 2.

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 21:52:57 +08:00 committed by David S. Miller
parent a8d4879d5f
commit f8e80fc4ac
7 changed files with 32 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/networking/smc-sysctl.rst
View File

@ -57,3 +57,11 @@ rmem - INTEGER
only allowed 512KiB for SMC-R and 1MiB for SMC-D.
Default: 64KiB
smcr_max_links_per_lgr - INTEGER
Controls the max number of links can be added to a SMC-R link group. Notice that
the actual number of the links added to a SMC-R link group depends on the number
of RDMA devices exist in the system. The acceptable value ranges from 1 to 2. Only
for SMC-R v2.1 and later.
Default: 2

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

@ -22,5 +22,6 @@ struct netns_smc {
int sysctl_smcr_testlink_time;
int sysctl_wmem;
int sysctl_rmem;
int sysctl_max_links_per_lgr;
};
#endif

2
net/smc/af_smc.c
View File

@ -2461,7 +2461,7 @@ static void smc_listen_work(struct work_struct *work)
if (rc)
goto out_decl;
rc = smc_clc_srv_v2x_features_validate(pclc, ini);
rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini);
if (rc)
goto out_decl;

10
net/smc/smc_clc.c
View File

@ -824,6 +824,7 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
struct smc_clc_smcd_gid_chid *gidchids;
struct smc_clc_msg_proposal_area *pclc;
struct smc_clc_ipv6_prefix *ipv6_prfx;
struct net *net = sock_net(&smc->sk);
struct smc_clc_v2_extension *v2_ext;
struct smc_clc_msg_smcd *pclc_smcd;
struct smc_clc_msg_trail *trl;
@ -944,7 +945,7 @@ 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_links = SMC_LINKS_PER_LGR_MAX_PREFER;
v2_ext->max_links = net->smc.sysctl_max_links_per_lgr;
}
pclc_base->hdr.length = htons(plen);
@ -1171,10 +1172,12 @@ int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
return len > 0 ? 0 : len;
}
int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
struct smc_clc_msg_proposal *pclc,
struct smc_init_info *ini)
{
struct smc_clc_v2_extension *pclc_v2_ext;
struct net *net = sock_net(&smc->sk);
ini->max_conns = SMC_CONN_PER_LGR_MAX;
ini->max_links = SMC_LINKS_ADD_LNK_MAX;
@ -1192,7 +1195,8 @@ int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
if (ini->max_conns < SMC_CONN_PER_LGR_MIN)
return SMC_CLC_DECL_MAXCONNERR;
ini->max_links = min_t(u8, pclc_v2_ext->max_links, SMC_LINKS_PER_LGR_MAX_PREFER);
ini->max_links = min_t(u8, pclc_v2_ext->max_links,
net->smc.sysctl_max_links_per_lgr);
if (ini->max_links < SMC_LINKS_ADD_LNK_MIN)
return SMC_CLC_DECL_MAXLINKERR;
}

3
net/smc/smc_clc.h
View File

@ -422,7 +422,8 @@ int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
u8 version, u8 *eid, struct smc_init_info *ini);
int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
u8 version, u8 *negotiated_eid, struct smc_init_info *ini);
int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
struct smc_clc_msg_proposal *pclc,
struct smc_init_info *ini);
int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
struct smc_init_info *ini);

12
net/smc/smc_sysctl.c
View File

@ -25,6 +25,8 @@ 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 struct ctl_table smc_table[] = {
{
@ -68,6 +70,15 @@ static struct ctl_table smc_table[] = {
.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,
},
{ }
};
@ -97,6 +108,7 @@ int __net_init smc_sysctl_net_init(struct net *net)
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;
return 0;

1
net/smc/smc_sysctl.h
View File

@ -23,6 +23,7 @@ void __net_exit smc_sysctl_net_exit(struct net *net);
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;
return 0;
}