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Message-ID: <1f162370-5878-80fc-25b9-0de22ba2efe1@linux.ibm.com>
Date: Wed, 9 Aug 2023 18:03:58 +0200
From: Wenjia Zhang <wenjia@...ux.ibm.com>
To: Guangguan Wang <guangguan.wang@...ux.alibaba.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: 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: [RFC PATCH v2 net-next 3/6] net/smc: support smc v2.x features
validate
On 07.08.23 08:27, Guangguan Wang wrote:
> Support smc v2.x features validate for smc v2.1.
>
a bit more description?
> 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_clc.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> net/smc/smc_clc.h | 7 +++++++
> 3 files changed, 71 insertions(+)
>
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index 52279bdc100a..fd58e25beddf 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -1169,6 +1169,7 @@ static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
> struct smc_clc_first_contact_ext *fce =
> (struct smc_clc_first_contact_ext *)
> (((u8 *)clc_v2) + sizeof(*clc_v2));
> + int rc;
>
> if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
> return 0;
> @@ -1191,6 +1192,9 @@ static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
> if (fce->release > SMC_RELEASE)
> return SMC_CLC_DECL_VERSMISMAT;
> ini->release_ver = fce->release;
> + rc = smc_clc_cli_v2x_features_validate(fce, ini);
> + if (rc)
> + return rc;
>
> return 0;
> }
> @@ -1367,6 +1371,9 @@ static int smc_connect_ism(struct smc_sock *smc,
> if (fce->release > SMC_RELEASE)
> return SMC_CLC_DECL_VERSMISMAT;
> ini->release_ver = fce->release;
> + rc = smc_clc_cli_v2x_features_validate(fce, ini);
> + if (rc)
> + return rc;
> }
>
> rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
> @@ -2417,6 +2424,10 @@ static void smc_listen_work(struct work_struct *work)
> if (rc)
> goto out_decl;
>
> + rc = smc_clc_srv_v2x_features_validate(pclc, ini);
> + if (rc)
> + goto out_decl;
> +
> mutex_lock(&smc_server_lgr_pending);
> smc_close_init(new_smc);
> smc_rx_init(new_smc);
> @@ -2449,6 +2460,13 @@ static void smc_listen_work(struct work_struct *work)
> goto out_decl;
> }
>
> + rc = smc_clc_v2x_features_confirm_check(cclc, ini);
> + if (rc) {
> + if (!ini->is_smcd)
> + goto out_unlock;
> + goto out_decl;
> + }
> +
> /* finish worker */
> if (!ini->is_smcd) {
> rc = smc_listen_rdma_finish(new_smc, cclc,
> diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
> index ae80c191a834..4f6b69af2b80 100644
> --- a/net/smc/smc_clc.c
> +++ b/net/smc/smc_clc.c
> @@ -1158,6 +1158,52 @@ int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
> return len > 0 ? 0 : len;
> }
>
> +int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
> + struct smc_init_info *ini)
> +{
> + struct smc_clc_v2_extension *pclc_v2_ext;
> +
> + if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) ||
> + ini->release_ver < SMC_RELEASE_1)
> + return 0;
> +
> + pclc_v2_ext = smc_get_clc_v2_ext(pclc);
> + if (!pclc_v2_ext)
> + return SMC_CLC_DECL_NOV2EXT;
> +
> + return 0;
> +}
> +
> +int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
> + struct smc_init_info *ini)
> +{
> + if (ini->release_ver < SMC_RELEASE_1)
> + return 0;
> +
> + return 0;
> +}
Why need the function? Since it returns 0 anyway.
> +
> +int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
> + struct smc_init_info *ini)
> +{
> + struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
> + (struct smc_clc_msg_accept_confirm_v2 *)cclc;
> + struct smc_clc_first_contact_ext *fce =
> + smc_get_clc_first_contact_ext(clc_v2, ini->is_smcd);
> +
> + if (cclc->hdr.version == SMC_V1 ||
> + !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
> + return 0;
> +
> + if (ini->release_ver != fce->release)
> + return SMC_CLC_DECL_RELEASEERR;
> +
> + if (fce->release < SMC_RELEASE_1)
> + return 0;
> +
> + return 0;
> +}
> +
> void smc_clc_get_hostname(u8 **host)
> {
> *host = &smc_hostname[0];
> diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
> index 6133276a8839..66932bfdc6d0 100644
> --- a/net/smc/smc_clc.h
> +++ b/net/smc/smc_clc.h
> @@ -45,6 +45,7 @@
> #define SMC_CLC_DECL_NOSEID 0x03030006 /* peer sent no SEID */
> #define SMC_CLC_DECL_NOSMCD2DEV 0x03030007 /* no SMC-Dv2 device found */
> #define SMC_CLC_DECL_NOUEID 0x03030008 /* peer sent no UEID */
> +#define SMC_CLC_DECL_RELEASEERR 0x03030009 /* release version negotiate failed */
> #define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/
> #define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */
> #define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */
> @@ -415,6 +416,12 @@ 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, struct smc_init_info *ini);
> +int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
> + struct smc_init_info *ini);
> +int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
> + struct smc_init_info *ini);
> +int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
> + struct smc_init_info *ini);
> void smc_clc_init(void) __init;
> void smc_clc_exit(void);
> void smc_clc_get_hostname(u8 **host);
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