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Date:   Fri, 26 Jun 2020 09:05:19 -0700
From:   Jakub Kicinski <>
To:     Denis Kirjanov <>
Subject: Re: [PATCH net-next v13 2/3] xen networking: add basic XDP support
 for xen-netfront

On Fri, 26 Jun 2020 14:40:38 +0300 Denis Kirjanov wrote:
> The patch adds a basic XDP processing to xen-netfront driver.
> We ran an XDP program for an RX response received from netback
> driver. Also we request xen-netback to adjust data offset for
> bpf_xdp_adjust_head() header space for custom headers.
> synchronization between frontend and backend parts is done
> by using xenbus state switching:
> Reconfiguring -> Reconfigured- > Connected
> UDP packets drop rate using xdp program is around 310 kpps
> using ./ and 160 kpps without the patch.
> Signed-off-by: Denis Kirjanov <>

Still here:

drivers/net/xen-netfront.c: In function xennet_xdp_xmit_one:
drivers/net/xen-netfront.c:581:31: warning: variable tx set but not used [-Wunused-but-set-variable]
  581 |  struct xen_netif_tx_request *tx;
      |                               ^~

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