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Cc:     linux-crypto@vger.kernel.org, manojmalviya@chelsio.com,
        Ayush Sawal <ayush.sawal@chelsio.com>
Subject: Re: Advertise maximum number of sg supported by driver in single
 request
To:     herbert@gondor.apana.org.au
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From:   Ayush Sawal <ayush.sawal@asicdesigners.com>
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Date:   Thu, 16 Jan 2020 13:27:24 +0530
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Hi Herbert,

Sorry for the late reply

On 15/01/2020 14:02:34 +0800, Herbert Xu wrote:

> On Tue, Jan 14, 2020 at 03:23:30PM +0530, Ayush Sawal wrote
>> Hi all,
>>
>> The hardware crypto drivers have a limit on max number of sgs they can
>> handle per crypto request.If data size in one crypto request is
>> huge,hardware crypto driver may not be able to send the request in single
>> shot to hardware and end up using fallback to software.
>>
>> Does it make sense to have a new API for crypto drivers using that 
>> drivers
>> can advertise the max number of sg it can handle in one crypto request?
>>
>> and then? crypto framework may also have to include the similar API which
>> crypto framework user can use while forming the crypto request .
>>
>> Does this implementation make sense?
>
> What is the actual limit? Are you running into this limit with
> real-life requests?

The max data limit is 15 sgs where each sg contains data of mtu size .
we are running a netperf udp stream test over ipsec tunnel .The ipsec 
tunnel is established between two hosts which are directly connected

Thanks,

Ayush