netdev - Re: [PATCH net-next v7 07/10] net/smc: compatible with 128-bits extended GID of virtual ISM device

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Date: Tue, 19 Dec 2023 20:22:34 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: Simon Horman <horms@...nel.org>
Cc: wintera@...ux.ibm.com, wenjia@...ux.ibm.com, hca@...ux.ibm.com,
 gor@...ux.ibm.com, agordeev@...ux.ibm.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 kgraul@...ux.ibm.com, jaka@...ux.ibm.com, borntraeger@...ux.ibm.com,
 svens@...ux.ibm.com, alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
 raspl@...ux.ibm.com, schnelle@...ux.ibm.com,
 guangguan.wang@...ux.alibaba.com, linux-s390@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v7 07/10] net/smc: compatible with 128-bits
 extended GID of virtual ISM device



On 2023/12/19 19:59, Simon Horman wrote:
> On Tue, Dec 19, 2023 at 04:45:33PM +0800, Wen Gu wrote:
>> According to virtual ISM support feature defined by SMCv2.1, GIDs of
>> virtual ISM device are UUIDs defined by RFC4122, which are 128-bits
>> long. So some adaptation work is required. And note that the GIDs of
>> existing platform firmware ISM devices still remain 64-bits long.
>>
>> Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
>> Reviewed-by: Alexandra Winter <wintera@...ux.ibm.com>
> 
> ...
> 
>> @@ -1023,9 +1041,12 @@ smcd_clc_prep_confirm_accept(struct smc_connection *conn,
>>   	if (version == SMC_V1) {
>>   		clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
>>   	} else {
>> -		clc->d1.chid = htons(smc_ism_get_chid(smcd));
>> +		chid = smc_ism_get_chid(smcd);
>> +		clc->d1.chid = htons(chid);
>>   		if (eid && eid[0])
>>   			memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN);
>> +		if (__smc_ism_is_virtual(chid))
>> +			clc->d1.gid_ext = htonll(smcd_gid.gid_ext);
> 
> Hi Wen Gu,
> 
> The type of clc->d1.gid_ext is u64 (host byte-order)
> but here it is being assigned a big endian value.
> This does not seem correct.
> 
> Flagged by Smatch.

Oh, thank you Simon! That's a regression. I mistakenly changed the type
to u64 instead of __be64 in previous versions when fixing conflicts.
Thank you very much for the catch.

> 
>>   		len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
>>   		if (first_contact) {
>>   			*fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini);
> 
> ...
>