linux-kernel - Re: [PATCH net-next 3/6] net/smc: support smc v2.x features validate

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Date:   Thu, 17 Aug 2023 11:31:22 +0800
From:   Guangguan Wang <guangguan.wang@...ux.alibaba.com>
To:     Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 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:     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 3/6] net/smc: support smc v2.x features validate



On 2023/8/16 20:49, Vadim Fedorenko wrote:
> On 16/08/2023 09:33, Guangguan Wang wrote:

>> +
>> +int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
>> +                      struct smc_init_info *ini)
>> +{
>> +    if (ini->release_nr < SMC_RELEASE_1)
>> +        return 0;
>> +
>> +    return 0;
>> +}
> 
> This function always returns 0. Is it really what expected?
> 

This patch is a frame code of v2x features validate.
Please read the next 2 patches, where will fill more code logic in this function.


[PATCH net-next 4/6] net/smc: support max connections per lgr negotiation
 int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
 				      struct smc_init_info *ini)
 {
+	struct smc_clc_first_contact_ext_v2x *fce_v2x =
+		(struct smc_clc_first_contact_ext_v2x *)fce;
+
 	if (ini->release_nr < SMC_RELEASE_1)
 		return 0;
 
+	if (!ini->is_smcd) {
+		if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN)
+			return SMC_CLC_DECL_MAXCONNERR;
+		ini->max_conns = fce_v2x->max_conns;
+	}
+
 	return 0;
 }


[PATCH net-next 5/6] net/smc: support max links per lgr negotiation in clc handshake
@@ -1208,6 +1216,11 @@ int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
 		if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN)
 			return SMC_CLC_DECL_MAXCONNERR;
 		ini->max_conns = fce_v2x->max_conns;
+
+		if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX ||
+		    fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN)
+			return SMC_CLC_DECL_MAXLINKERR;
+		ini->max_links = fce_v2x->max_links;
 	}
 
 	return 0;


Thanks,
Guangguan Wang