netdev - skb length without fragments

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Message-ID: <CAABr=eaZePxgwS=0fFhUMsXxd1T0PbcQ4-TJBOw4z4qqhEN_cA@mail.gmail.com>
Date:   Mon, 8 Oct 2018 23:32:34 +0530
From:   pradeep kumar nalla <pradeepkumar.nalla@...il.com>
To:     netdev@...r.kernel.org
Subject: skb length without fragments

Hi

While testing my network driver with pktgen I could see an skb greater
than 16K without fragments in xmit function. This lead to a fix in my
driver that assumes when an SKB whose length is greater than 16K will
come with fragments. Apart from pktgen what are the chances or
possibilities of getting an SKB greater than 16K without fragments? .
When I tried with tools like iperf/iper3/netperf, didn’t see a single
incidence where the SKB length is greater than 16K and without frags.
Even socket layer I see function alloc_skb_with_frags, does this mean
all the larger packets come with frags.

Please pardon if it is not a correct mailing list to ask above question.

Thanks
Pradeep.