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

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Date:   Fri, 17 Jan 2020 08:04:32 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Ayush Sawal <ayush.sawal@...cdesigners.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        <linux-crypto@...r.kernel.org>, <manojmalviya@...lsio.com>,
        Ayush Sawal <ayush.sawal@...lsio.com>, <netdev@...r.kernel.org>
Subject: Re: Advertise maximum number of sg supported by driver in single
 request

On Fri, Jan 17, 2020 at 12:13:07PM +0530, Ayush Sawal wrote:
> 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.

I'm lacking a bit of context here, but this should generate 15 IP
packets that are encrypted one by one.