From patchwork Tue Dec 12 08:52:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 13488741 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-113.freemail.mail.aliyun.com (out30-113.freemail.mail.aliyun.com [115.124.30.113]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 715E1CF; Tue, 12 Dec 2023 00:52:45 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R361e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045192;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=22;SR=0;TI=SMTPD_---0VyLpJRe_1702371160; Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0VyLpJRe_1702371160) by smtp.aliyun-inc.com; Tue, 12 Dec 2023 16:52:42 +0800 From: Wen Gu To: wintera@linux.ibm.com, wenjia@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, kgraul@linux.ibm.com, jaka@linux.ibm.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, raspl@linux.ibm.com, schnelle@linux.ibm.com, guangguan.wang@linux.alibaba.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, lzinux-kernel@vger.kernel.org Subject: [PATCH net-next v6 04/10] net/smc: support SMCv2.x supplemental features negotiation Date: Tue, 12 Dec 2023 16:52:25 +0800 Message-Id: <1702371151-125258-5-git-send-email-guwen@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1702371151-125258-1-git-send-email-guwen@linux.alibaba.com> References: <1702371151-125258-1-git-send-email-guwen@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: X-Patchwork-Delegate: kuba@kernel.org This patch adds SMCv2.x supplemental features negotiation. Supported SMCv2.x supplemental features are represented by feature_mask in FCE field. The negotiation process is as follows. Server Client Proposal(features(c-mask bits)) <----------------------------------------- Accept(features(s-mask bits)) -----------------------------------------> Confirm(features(s&c-mask bits)) <----------------------------------------- Signed-off-by: Wen Gu Reviewed-and-tested-by: Wenjia Zhang --- net/smc/smc.h | 4 ++++ net/smc/smc_clc.c | 7 +++++++ net/smc/smc_clc.h | 14 ++++++++++---- net/smc/smc_core.h | 1 + 4 files changed, 22 insertions(+), 4 deletions(-) diff --git a/net/smc/smc.h b/net/smc/smc.h index cd51261..95f56c7 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -58,6 +58,10 @@ enum smc_state { /* possible states of an SMC socket */ SMC_PROCESSABORT = 27, }; +#define SMC_FEATURE_MASK 0 /* bitmask of + * supported supplemental features + */ + struct smc_link_group; struct smc_wr_rx_hdr { /* common prefix part of LLC and CDC to demultiplex */ diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 6473333..900d307 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -438,6 +438,7 @@ static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x, fce_v2x->max_conns = ini->max_conns; fce_v2x->max_links = ini->max_links; } + fce_v2x->feature_mask = htons(ini->feature_mask); } out: @@ -907,6 +908,7 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) pclc_smcd->v2_ext_offset = htons(v2_ext_offset); plen += sizeof(*v2_ext); + v2_ext->feature_mask = htons(SMC_FEATURE_MASK); read_lock(&smc_clc_eid_table.lock); v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt; plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN; @@ -1208,6 +1210,7 @@ int smc_clc_srv_v2x_features_validate(struct smc_sock *smc, ini->max_conns = SMC_CONN_PER_LGR_MAX; ini->max_links = SMC_LINKS_ADD_LNK_MAX; + ini->feature_mask = SMC_FEATURE_MASK; if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || ini->release_nr < SMC_RELEASE_1) @@ -1251,6 +1254,8 @@ int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, return SMC_CLC_DECL_MAXLINKERR; ini->max_links = fce_v2x->max_links; } + /* common supplemental features of server and client */ + ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK; return 0; } @@ -1279,6 +1284,8 @@ int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, if (fce_v2x->max_links != ini->max_links) return SMC_CLC_DECL_MAXLINKERR; } + /* common supplemental features returned by client */ + ini->feature_mask = ntohs(fce_v2x->feature_mask); return 0; } diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h index 614fa2f..347ebe2 100644 --- a/net/smc/smc_clc.h +++ b/net/smc/smc_clc.h @@ -138,7 +138,8 @@ struct smc_clc_v2_extension { u8 roce[16]; /* RoCEv2 GID */ u8 max_conns; u8 max_links; - u8 reserved[14]; + __be16 feature_mask; + u8 reserved[12]; u8 user_eids[][SMC_MAX_EID_LEN]; }; @@ -240,9 +241,14 @@ struct smc_clc_first_contact_ext { struct smc_clc_first_contact_ext_v2x { struct smc_clc_first_contact_ext fce_v2_base; - u8 max_conns; /* for SMC-R only */ - u8 max_links; /* for SMC-R only */ - u8 reserved3[2]; + union { + struct { + u8 max_conns; /* for SMC-R only */ + u8 max_links; /* for SMC-R only */ + }; + u8 reserved3[2]; /* for SMC-D only */ + }; + __be16 feature_mask; __be32 vendor_exp_options; u8 reserved4[8]; } __packed; /* format defined in diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index 120027d..9f65678 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -401,6 +401,7 @@ struct smc_init_info { u8 max_links; u8 first_contact_peer; u8 first_contact_local; + u16 feature_mask; unsigned short vlan_id; u32 rc; u8 negotiated_eid[SMC_MAX_EID_LEN];