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Date: Wed, 16 Aug 2023 16:14:15 +0200
From: Jan Karcher <jaka@...ux.ibm.com>
To: Guangguan Wang <guangguan.wang@...ux.alibaba.com>, wenjia@...ux.ibm.com,
kgraul@...ux.ibm.com, tonylu@...ux.alibaba.com, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: horms@...nel.org, alibuda@...ux.alibaba.com, guwen@...ux.alibaba.com,
linux-s390@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/6] net/smc: support smc release version
negotiation in clc handshake
On 16/08/2023 10:33, Guangguan Wang wrote:
> Support smc release version negotiation in clc handshake based on
> SMC v2, where no negotiation process for different releases, but
> for different versions. The latest smc release version was updated
> to v2.1. And currently there are two release versions of SMCv2, v2.0
> and v2.1. In the release version negotiation, client sends the preferred
> release version by CLC Proposal Message, server makes decision for which
> release version to use based on the client preferred release version and
> self-supported release version (here choose the minimum release version
> of the client preferred and server latest supported), then the decision
> returns to client by CLC Accept Message. Client confirms the decision by
> CLC Confirm Message.
>
> Client Server
> Proposal(preferred release version)
> ------------------------------------>
>
> Accept(accpeted release version)
> min(client preferred, server latest supported)
> <------------------------------------
>
> Confirm(accpeted release version)
> ------------------------------------>
>
> Signed-off-by: Guangguan Wang <guangguan.wang@...ux.alibaba.com>
> Reviewed-by: Tony Lu <tonylu@...ux.alibaba.com>
> ---
> net/smc/af_smc.c | 18 ++++++++++++++++--
> net/smc/smc.h | 5 ++++-
> net/smc/smc_clc.c | 14 +++++++-------
> net/smc/smc_clc.h | 23 ++++++++++++++++++++++-
> net/smc/smc_core.h | 1 +
> 5 files changed, 50 insertions(+), 11 deletions(-)
>
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index a7f887d91d89..97265691bc95 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -1187,6 +1187,9 @@ static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
> return SMC_CLC_DECL_NOINDIRECT;
> }
> }
> +
> + ini->release_nr = fce->release;
> +
why would we do this and vvvvv
> return 0;
> }
>
> @@ -1355,6 +1358,13 @@ 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);
> +
> + ini->release_nr = fce->release;
> + }
> +
this two times?
Can't we put this together into __smc_connect where those functions get
called (via smc_connect_rdma and smc_connect_ism)?
Please provide reasoning, it might be that i oversaw the reasoning
behind this duplication.
Also note: Even if there is a reason to set this information seperate
for SMC-D and SMC-R think about using your very neat helper function
(smc_get_clc_first_contact_ext) in smc_connect_rdma_v2_prepare as well.
> rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
> if (rc)
> return rc;
> @@ -1389,7 +1399,7 @@ 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 +1975,10 @@ static int smc_listen_v2_check(struct smc_sock *new_smc,
> }
> }
>
> + ini->release_nr = pclc_v2_ext->hdr.flag.release;
> + if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
> + ini->release_nr = SMC_RELEASE;
> +
> out:
> if (!ini->smcd_version && !ini->smcr_version)
> return rc;
> @@ -2412,7 +2426,7 @@ 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..7c5627c6abcc 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_nr)
> {
> memset(fce, 0, sizeof(*fce));
> fce->os_type = SMC_CLC_OS_LINUX;
> - fce->release = SMC_RELEASE;
> + fce->release = release_nr;
> 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_nr);
> clc_v2->hdr.length = htons(len);
> }
> memcpy(trl.eyecatcher, SMCD_EYECATCHER,
> @@ -1063,10 +1063,10 @@ 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_nr);
> fce.v2_direct = !link->lgr->uses_gateway;
> memset(&gle, 0, sizeof(gle));
> - if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
> + if (clc->hdr.type == SMC_CLC_CONFIRM) {
> gle.gid_cnt = ini->smcrv2.gidlist.len;
> len += sizeof(gle);
> len += gle.gid_cnt * sizeof(gle.gid[0]);
> @@ -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..b6c68db61f23 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_nr;
> u8 first_contact_peer;
> u8 first_contact_local;
> unsigned short vlan_id;
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