From nobody Thu Dec 18 05:36:00 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 321F4C61D97 for ; Wed, 22 Nov 2023 13:53:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344296AbjKVNxT (ORCPT ); Wed, 22 Nov 2023 08:53:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344264AbjKVNxL (ORCPT ); Wed, 22 Nov 2023 08:53:11 -0500 Received: from out30-124.freemail.mail.aliyun.com (out30-124.freemail.mail.aliyun.com [115.124.30.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FEC2D5C; Wed, 22 Nov 2023 05:53:07 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R661e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=guangguan.wang@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0Vww0FYJ_1700661184; Received: from localhost.localdomain(mailfrom:guangguan.wang@linux.alibaba.com fp:SMTPD_---0Vww0FYJ_1700661184) by smtp.aliyun-inc.com; Wed, 22 Nov 2023 21:53:04 +0800 From: Guangguan Wang To: wenjia@linux.ibm.com, jaka@linux.ibm.com, kgraul@linux.ibm.com, corbet@lwn.net, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com Cc: tonylu@linux.alibaba.com, alibuda@linux.alibaba.com, guwen@linux.alibaba.com, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next 2/2] net/smc: add sysctl for max conns per lgr for SMC-R v2.1 Date: Wed, 22 Nov 2023 21:52:58 +0800 Message-Id: <20231122135258.38746-3-guangguan.wang@linux.alibaba.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20231122135258.38746-1-guangguan.wang@linux.alibaba.com> References: <20231122135258.38746-1-guangguan.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Dust Li Reviewed-by: Jan Karcher --- Documentation/networking/smc-sysctl.rst | 6 ++++++ include/net/netns/smc.h | 1 + net/smc/smc_clc.c | 5 +++-- net/smc/smc_sysctl.c | 12 ++++++++++++ net/smc/smc_sysctl.h | 1 + 5 files changed, 23 insertions(+), 2 deletions(-) diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networ= king/smc-sysctl.rst index c6ef86ef4c4f..a874d007f2db 100644 --- a/Documentation/networking/smc-sysctl.rst +++ b/Documentation/networking/smc-sysctl.rst @@ -65,3 +65,9 @@ smcr_max_links_per_lgr - INTEGER for SMC-R v2.1 and later. =20 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 diff --git a/include/net/netns/smc.h b/include/net/netns/smc.h index da7023587824..fc752a50f91b 100644 --- a/include/net/netns/smc.h +++ b/include/net/netns/smc.h @@ -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 diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 1f87c8895a27..0fda5156eef0 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -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 =3D SMC_CONN_PER_LGR_PREFER; + v2_ext->max_conns =3D net->smc.sysctl_max_conns_per_lgr; v2_ext->max_links =3D net->smc.sysctl_max_links_per_lgr; } =20 @@ -1191,7 +1191,8 @@ int smc_clc_srv_v2x_features_validate(struct smc_sock= *smc, return SMC_CLC_DECL_NOV2EXT; =20 if (ini->smcr_version & SMC_V2) { - ini->max_conns =3D min_t(u8, pclc_v2_ext->max_conns, SMC_CONN_PER_LGR_PR= EFER); + ini->max_conns =3D 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; =20 diff --git a/net/smc/smc_sysctl.c b/net/smc/smc_sysctl.c index 3e9bb921e40a..a5946d1b9d60 100644 --- a/net/smc/smc_sysctl.c +++ b/net/smc/smc_sysctl.c @@ -27,6 +27,8 @@ static const int net_smc_wmem_init =3D (64 * 1024); static const int net_smc_rmem_init =3D (64 * 1024); static int links_per_lgr_min =3D SMC_LINKS_ADD_LNK_MIN; static int links_per_lgr_max =3D SMC_LINKS_ADD_LNK_MAX; +static int conns_per_lgr_min =3D SMC_CONN_PER_LGR_MIN; +static int conns_per_lgr_max =3D SMC_CONN_PER_LGR_MAX; =20 static struct ctl_table smc_table[] =3D { { @@ -79,6 +81,15 @@ static struct ctl_table smc_table[] =3D { .extra1 =3D &links_per_lgr_min, .extra2 =3D &links_per_lgr_max, }, + { + .procname =3D "smcr_max_conns_per_lgr", + .data =3D &init_net.smc.sysctl_max_conns_per_lgr, + .maxlen =3D sizeof(int), + .mode =3D 0644, + .proc_handler =3D proc_dointvec_minmax, + .extra1 =3D &conns_per_lgr_min, + .extra2 =3D &conns_per_lgr_max, + }, { } }; =20 @@ -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 =3D SMC_LINKS_PER_LGR_MAX_PREFER; + net->smc.sysctl_max_conns_per_lgr =3D SMC_CONN_PER_LGR_PREFER; =20 return 0; =20 diff --git a/net/smc/smc_sysctl.h b/net/smc/smc_sysctl.h index 5783dd7575dd..eb2465ae1e15 100644 --- a/net/smc/smc_sysctl.h +++ b/net/smc/smc_sysctl.h @@ -24,6 +24,7 @@ static inline int smc_sysctl_net_init(struct net *net) { net->smc.sysctl_autocorking_size =3D SMC_AUTOCORKING_DEFAULT_SIZE; net->smc.sysctl_max_links_per_lgr =3D SMC_LINKS_PER_LGR_MAX_PREFER; + net->smc.sysctl_max_conns_per_lgr =3D SMC_CONN_PER_LGR_PREFER; return 0; } =20 --=20 2.24.3 (Apple Git-128)