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Message-Id: <20230803132422.6280-2-guangguan.wang@linux.alibaba.com>
Date: Thu, 3 Aug 2023 21:24:17 +0800
From: Guangguan Wang <guangguan.wang@...ux.alibaba.com>
To: wenjia@...ux.ibm.com,
jaka@...ux.ibm.com,
kgraul@...ux.ibm.com,
tonylu@...ux.alibaba.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com
Cc: alibuda@...ux.alibaba.com,
guwen@...ux.alibaba.com,
linux-s390@...r.kernel.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next 1/6] net/smc: support smc release version negotiation in clc handshake
Support smc release version negotiation in clc handshake. And set
the latest smc release version to 2.1.
Signed-off-by: Guangguan Wang <guangguan.wang@...ux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@...ux.alibaba.com>
---
net/smc/af_smc.c | 22 ++++++++++++++++++++--
net/smc/smc.h | 5 ++++-
net/smc/smc_clc.c | 12 ++++++------
net/smc/smc_clc.h | 23 ++++++++++++++++++++++-
net/smc/smc_core.h | 1 +
5 files changed, 53 insertions(+), 10 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index a7f887d91d89..bac73eb0542d 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1187,6 +1187,11 @@ static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
return SMC_CLC_DECL_NOINDIRECT;
}
}
+
+ if (fce->release > SMC_RELEASE)
+ return SMC_CLC_DECL_VERSMISMAT;
+ ini->release_ver = fce->release;
+
return 0;
}
@@ -1355,6 +1360,15 @@ static int smc_connect_ism(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
(struct smc_clc_msg_accept_confirm_v2 *)aclc;
+ if (ini->first_contact_peer) {
+ struct smc_clc_first_contact_ext *fce =
+ smc_get_clc_first_contact_ext(aclc_v2, true);
+
+ if (fce->release > SMC_RELEASE)
+ return SMC_CLC_DECL_VERSMISMAT;
+ ini->release_ver = fce->release;
+ }
+
rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
if (rc)
return rc;
@@ -1389,7 +1403,7 @@ static int smc_connect_ism(struct smc_sock *smc,
}
rc = smc_clc_send_confirm(smc, ini->first_contact_local,
- aclc->hdr.version, eid, NULL);
+ aclc->hdr.version, eid, ini);
if (rc)
goto connect_abort;
mutex_unlock(&smc_server_lgr_pending);
@@ -1965,6 +1979,10 @@ static int smc_listen_v2_check(struct smc_sock *new_smc,
}
}
+ ini->release_ver = pclc_v2_ext->hdr.flag.release;
+ if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
+ ini->release_ver = SMC_RELEASE;
+
out:
if (!ini->smcd_version && !ini->smcr_version)
return rc;
@@ -2412,7 +2430,7 @@ static void smc_listen_work(struct work_struct *work)
/* send SMC Accept CLC message */
accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
- accept_version, ini->negotiated_eid);
+ accept_version, ini->negotiated_eid, ini);
if (rc)
goto out_unlock;
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 2eeea4cdc718..9cce1a41e011 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -21,7 +21,10 @@
#define SMC_V1 1 /* SMC version V1 */
#define SMC_V2 2 /* SMC version V2 */
-#define SMC_RELEASE 0
+
+#define SMC_RELEASE_0 0
+#define SMC_RELEASE_1 1
+#define SMC_RELEASE SMC_RELEASE_1 /* the latest release version */
#define SMCPROTO_SMC 0 /* SMC protocol, IPv4 */
#define SMCPROTO_SMC6 1 /* SMC protocol, IPv6 */
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index b9b8b07aa702..b838ad0749b4 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -420,11 +420,11 @@ smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
return true;
}
-static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
+static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len, int release_ver)
{
memset(fce, 0, sizeof(*fce));
fce->os_type = SMC_CLC_OS_LINUX;
- fce->release = SMC_RELEASE;
+ fce->release = release_ver;
memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
(*len) += sizeof(*fce);
}
@@ -1019,7 +1019,7 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
if (first_contact)
- smc_clc_fill_fce(&fce, &len);
+ smc_clc_fill_fce(&fce, &len, ini->release_ver);
clc_v2->hdr.length = htons(len);
}
memcpy(trl.eyecatcher, SMCD_EYECATCHER,
@@ -1063,7 +1063,7 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
if (first_contact) {
- smc_clc_fill_fce(&fce, &len);
+ smc_clc_fill_fce(&fce, &len, ini->release_ver);
fce.v2_direct = !link->lgr->uses_gateway;
memset(&gle, 0, sizeof(gle));
if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
@@ -1141,7 +1141,7 @@ int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
/* send CLC ACCEPT message across internal TCP socket */
int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
- u8 version, u8 *negotiated_eid)
+ u8 version, u8 *negotiated_eid, struct smc_init_info *ini)
{
struct smc_clc_msg_accept_confirm_v2 aclc_v2;
int len;
@@ -1149,7 +1149,7 @@ int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
memset(&aclc_v2, 0, sizeof(aclc_v2));
aclc_v2.hdr.type = SMC_CLC_ACCEPT;
len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
- version, negotiated_eid, NULL);
+ version, negotiated_eid, ini);
if (len < ntohs(aclc_v2.hdr.length))
len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
index 5fee545c9a10..b923e89acafb 100644
--- a/net/smc/smc_clc.h
+++ b/net/smc/smc_clc.h
@@ -370,6 +370,27 @@ smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
}
+static inline struct smc_clc_first_contact_ext *
+smc_get_clc_first_contact_ext(struct smc_clc_msg_accept_confirm_v2 *clc_v2,
+ bool is_smcd)
+{
+ int clc_v2_len;
+
+ if (clc_v2->hdr.version == SMC_V1 ||
+ !(clc_v2->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
+ return NULL;
+
+ if (is_smcd)
+ clc_v2_len =
+ offsetofend(struct smc_clc_msg_accept_confirm_v2, d1);
+ else
+ clc_v2_len =
+ offsetofend(struct smc_clc_msg_accept_confirm_v2, r1);
+
+ return (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) +
+ clc_v2_len);
+}
+
struct smcd_dev;
struct smc_init_info;
@@ -382,7 +403,7 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
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);
+ u8 version, u8 *negotiated_eid, struct smc_init_info *ini);
void smc_clc_init(void) __init;
void smc_clc_exit(void);
void smc_clc_get_hostname(u8 **host);
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 3c1b31bfa1cf..1a97fef39127 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -374,6 +374,7 @@ struct smc_init_info {
u8 is_smcd;
u8 smc_type_v1;
u8 smc_type_v2;
+ u8 release_ver;
u8 first_contact_peer;
u8 first_contact_local;
unsigned short vlan_id;
--
2.24.3 (Apple Git-128)
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