netdev - Re: Advertise maximum number of sg supported by driver in single request

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Date:   Fri, 17 Jan 2020 12:13:07 +0530
From:   Ayush Sawal <ayush.sawal@...cdesigners.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     ayush.sawal@...cdesigners.com, linux-crypto@...r.kernel.org,
        manojmalviya@...lsio.com, Ayush Sawal <ayush.sawal@...lsio.com>,
        netdev@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: Advertise maximum number of sg supported by driver in single
 request

Hi Herbert,

On 1/17/2020 11:53 AM, Herbert Xu wrote:
> On Thu, Jan 16, 2020 at 01:27:24PM +0530, Ayush Sawal wrote:
>> 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
> Are you actually getting 15-element SG lists from IPsec? What is
> generating an skb with 15-element SG lists?
we have established the ipsec tunnel in transport mode using ip xfrm.
and running traffic using netserver and netperf.

In server side we are running
netserver -4
In client side we are running
"netperf -H <serverip> -p <port> -t UDP_STREAM  -Cc -- -m 21k"
where the packet size is 21k ,which is then fragmented into 15 ip 
fragments each of mtu size.
The mtu size currently is 1500bytes.