Re: [PATCH net-next v6 02/10] dpaa_eth: add support for DPAA Ethernet

From: Madalin-Cristian Bucur <madalin.bucur@nxp.com>
Date: Mon, 7 Nov 2016 15:43:26 +0000

quoted

From: David Miller [mailto:davem@davemloft.net]
Sent: Thursday, November 03, 2016 9:58 PM

Why?  By clearing this, you disallow an important fundamental way to do
performane testing, via pktgen.

The Tx path in DPAA requires one to insert a back-pointer to the skb into
the Tx buffer. On the Tx confirmation path the back-pointer in the buffer
is used to release the skb. If Tx buffer is shared we'd alter the back-pointer
and leak/double free skbs. See also 

Then have your software state store an array of SKB pointers, one for each
TX ring entry, just like every other driver does.