netdev - Re: [PATCH bpf-next 00/11] AF_XDP zero-copy support for i40e

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Date:   Wed, 29 Aug 2018 18:12:19 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Björn Töpel <bjorn.topel@...il.com>,
        magnus.karlsson@...el.com, magnus.karlsson@...il.com,
        alexander.h.duyck@...el.com, alexander.duyck@...il.com,
        ast@...nel.org, brouer@...hat.com, netdev@...r.kernel.org,
        jesse.brandeburg@...el.com, anjali.singhai@...el.com,
        peter.waskiewicz.jr@...el.com
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        michael.lundkvist@...csson.com, willemdebruijn.kernel@...il.com,
        john.fastabend@...il.com, jakub.kicinski@...ronome.com,
        neerav.parikh@...el.com, mykyta.iziumtsev@...aro.org,
        francois.ozog@...aro.org, ilias.apalodimas@...aro.org,
        brian.brooks@...aro.org, u9012063@...il.com, pavel@...tnetmon.com,
        qi.z.zhang@...el.com
Subject: Re: [PATCH bpf-next 00/11] AF_XDP zero-copy support for i40e

On 08/28/2018 02:44 PM, Björn Töpel wrote:
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> This patch set introduces zero-copy AF_XDP support for Intel's i40e
> driver. In the first preparatory patch we also add support for
> XDP_REDIRECT for zero-copy allocated frames so that XDP programs can
> redirect them. This was a ToDo from the first AF_XDP zero-copy patch
> set from early June. Special thanks to Alex Duyck and Jesper Dangaard
> Brouer for reviewing earlier versions of this patch set.
> 
> The i40e zero-copy code is located in its own file i40e_xsk.[ch]. Note
> that in the interest of time, to get an AF_XDP zero-copy implementation
> out there for people to try, some code paths have been copied from the
> XDP path to the zero-copy path. It is out goal to merge the two paths
> in later patch sets.
> 
> In contrast to the implementation from beginning of June, this patch
> set does not require any extra HW queues for AF_XDP zero-copy
> TX. Instead, the XDP TX HW queue is used for both XDP_REDIRECT and
> AF_XDP zero-copy TX.
> 
> Jeff, given that most of changes are in i40e, it is up to you how you
> would like to route these patches. The set is tagged bpf-next, but
> if taking it via the Intel driver tree is easier, let us know.
> 
> We have run some benchmarks on a dual socket system with two Broadwell
> E5 2660 @ 2.0 GHz with hyperthreading turned off. Each socket has 14
> cores which gives a total of 28, but only two cores are used in these
> experiments. One for TR/RX and one for the user space application. The
> memory is DDR4 @ 2133 MT/s (1067 MHz) and the size of each DIMM is
> 8192MB and with 8 of those DIMMs in the system we have 64 GB of total
> memory. The compiler used is gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0. The
> NIC is Intel I40E 40Gbit/s using the i40e driver.
> 
> Below are the results in Mpps of the I40E NIC benchmark runs for 64
> and 1500 byte packets, generated by a commercial packet generator HW
> outputing packets at full 40 Gbit/s line rate. The results are with
> retpoline and all other spectre and meltdown fixes, so these results
> are not comparable to the ones from the zero-copy patch set in June.
> 
> AF_XDP performance 64 byte packets.
> Benchmark   XDP_SKB    XDP_DRV    XDP_DRV with zerocopy
> rxdrop       2.6        8.2         15.0
> txpush       2.2        -           21.9
> l2fwd        1.7        2.3         11.3
> 
> AF_XDP performance 1500 byte packets:
> Benchmark   XDP_SKB   XDP_DRV     XDP_DRV with zerocopy
> rxdrop       2.0        3.3         3.3
> l2fwd        1.3        1.7         3.1
> 
> XDP performance on our system as a base line:
> 
> 64 byte packets:
> XDP stats       CPU     pps         issue-pps
> XDP-RX CPU      16      18.4M  0
> 
> 1500 byte packets:
> XDP stats       CPU     pps         issue-pps
> XDP-RX CPU      16      3.3M    0
> 
> The structure of the patch set is as follows:
> 
> Patch 1: Add support for XDP_REDIRECT of zero-copy allocated frames
> Patches 2-4: Preparatory patches to common xsk and net code
> Patches 5-7: Preparatory patches to i40e driver code for RX
> Patch 8: i40e zero-copy support for RX
> Patch 9: Preparatory patch to i40e driver code for TX
> Patch 10: i40e zero-copy support for TX
> Patch 11: Add flags to sample application to force zero-copy/copy mode
> 
> We based this patch set on bpf-next commit 050cdc6c9501 ("Merge
> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net")
> 
> 
> Magnus & Björn
> 
> Björn Töpel (8):
>   xdp: implement convert_to_xdp_frame for MEM_TYPE_ZERO_COPY
>   xdp: export xdp_rxq_info_unreg_mem_model
>   xsk: expose xdp_umem_get_{data,dma} to drivers
>   i40e: added queue pair disable/enable functions
>   i40e: refactor Rx path for re-use
>   i40e: move common Rx functions to i40e_txrx_common.h
>   i40e: add AF_XDP zero-copy Rx support
>   samples/bpf: add -c/--copy -z/--zero-copy flags to xdpsock
> 
> Magnus Karlsson (3):
>   net: add napi_if_scheduled_mark_missed
>   i40e: move common Tx functions to i40e_txrx_common.h
>   i40e: add AF_XDP zero-copy Tx support

Thanks for working on this, LGTM! Are you also planning to get ixgbe
out after that?

For the series:

Acked-by: Daniel Borkmann <daniel@...earbox.net>

Thanks,
Daniel