netdev - Re: [PATCH v3 bpf-next] net: veth: alloc skb in bulk for ndo_xdp

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Date:   Sun, 31 Jan 2021 23:16:24 +0900
From:   Toshiaki Makita <toshiaki.makita1@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, lorenzo.bianconi@...hat.com,
        brouer@...hat.com, toke@...hat.com
Subject: Re: [PATCH v3 bpf-next] net: veth: alloc skb in bulk for ndo_xdp_xmit

On 2021/01/30 7:04, Lorenzo Bianconi wrote:
> Split ndo_xdp_xmit and ndo_start_xmit use cases in veth_xdp_rcv routine
> in order to alloc skbs in bulk for XDP_PASS verdict.
> Introduce xdp_alloc_skb_bulk utility routine to alloc skb bulk list.
> The proposed approach has been tested in the following scenario:
> 
> eth (ixgbe) --> XDP_REDIRECT --> veth0 --> (remote-ns) veth1 --> XDP_PASS
> 
> XDP_REDIRECT: xdp_redirect_map bpf sample
> XDP_PASS: xdp_rxq_info bpf sample
> 
> traffic generator: pkt_gen sending udp traffic on a remote device
> 
> bpf-next master: ~3.64Mpps
> bpf-next + skb bulking allocation: ~3.79Mpps
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

Reviewed-by: Toshiaki Makita <toshiaki.makita1@...il.com>

Thanks,
Toshiaki Makita