From: Wen Gu guwen@linux.alibaba.com
mainline inclusion from mainline-v6.8-rc1 commit ece60db3a4ce24a2a913a8960eb6fec561cdbcf6 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IACM52
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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 guwen@linux.alibaba.com Reviewed-and-tested-by: Wenjia Zhang wenjia@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- 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 e377980b8414..903b15168239 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 a28dee81d6fa..3a05940800e0 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -448,6 +448,7 @@ 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: @@ -916,6 +917,7 @@ 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; @@ -1215,6 +1217,7 @@ int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
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) @@ -1256,6 +1259,8 @@ 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; } @@ -1284,6 +1289,8 @@ 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 d7b1716cfb0f..76f4f0ce1d80 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 120027d40469..9f656780d46c 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];