linux-kernel - Re: [RFC PATCH 0/3] net: ethernet: ti: cpsw: Add XDP support

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Date:   Thu, 18 Apr 2019 08:12:06 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Cc:     grygorii.strashko@...com, linux-omap@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        hawk@...nel.org, Xdp <xdp-newbies@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>, aniel@...earbox.net,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>
Subject: Re: [RFC PATCH 0/3] net: ethernet: ti: cpsw: Add XDP support

On Wed, 17 Apr 2019 at 19:51, Ivan Khoronzhuk
<ivan.khoronzhuk@...aro.org> wrote:
>
> This patchset is RFC adding XDP support for TI cpsw driver that is
> based on page_pool allocator. It was verified with af_xdp sockets
> and on xdp drop. For XDP redirect to another interface it's under
> verification, still not sure about all cases that should be verified.
> Also regular tests with iperf2 were done in order to verify impact on
> regular netstack performance, compared with base commit from
> net-next/master: 432bc230700f86801cffa5e159e05dea6229f722
>
> It was verified with following configs enabled:
> CONFIG_JIT=y
> CONFIG_BPFILTER=y
> CONFIG_BPF_SYSCALL=y
> CONFIG_XDP_SOCKETS=y
> CONFIG_BPF_EVENTS=y
> CONFIG_HAVE_EBPF_JIT=y
> CONFIG_BPF_JIT=y
> CONFIG_CGROUP_BPF=y
>
> iperf2 UDP RX summary (packet size / Mbps):
> +--------------------------------------------------------------+
> | pkt_size/rate | 1024 | 1500 | 1470 |  64  | 128  | 512 | 256 |
> |---------------+------+------+------+------+------+-----+-----|
> | base commit   | 561  | 470  | 796  |  35  | 70.1 | 281 | 140 |
> |---------------+------+------+------+------+------+-----+-----|
> | XDP patched   | 563  | 455  | 808  |  35  | 70.2 | 282 | 141 |
> +--------------------------------------------------------------+
>
> iperf2 UDP TX summary (packet size / Mbps):
> +--------------------------------------------------------------+
> | pkt_size/rate | 1024 | 1500 | 1470 |  64  | 128  | 512 | 256 |
> |---------------+------+------+------+------+------+-----+-----|
> | base commit   | 555  | 666  | 736  | 34.5 | 70.3 | 281 | 140 |
> |---------------+------+------+------+------+------+-----+-----|
> | XDP patched   | 558  | 696  | 759  | 35.2 | 69.2 | 279 | 140 |
> +--------------------------------------------------------------+
>
> iperf2 TCP summary (window size / Mbps):
> +------------------------------------------------------------+
> | window size/rate |  16  |  32  |  64  |  128 |  8   | 256  |
> |------------------+------+------+------+------+------+------|
> | base commit      | 753  | 887  | 931  | 932  | 676  | 932  |
> |------------------+------+------+------+------+------+------|
> | XDP patched      | 823  | 888  | 932  | 933  | 669  | 933  |
> +------------------------------------------------------------+
>
> For af_xdp socket type verification several generic changes should be added
> that can be seen here (rough fixes, for samples related seems like last version
> of samples is more integrated with libbpf api, so should be rebased,
> witch I will send as RFC separately):
> https://github.com/ikhorn/af_xdp_stuff/tree/af_xdp_armv7
>

More XDP support, yay!

As for mmap/AF_XDP on 32-bit systems; Instead of hacking the if_xdp.h,
mmap2 should be used. Have a look at the libbpf code here [1]


Björn

[1] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/tools/lib/bpf/xsk.c#n81


> Ivan Khoronzhuk (3):
>   net: ethernet: ti: davinci_cpdma: add dma mapped submit
>   net: ethernet: ti: davinci_cpdma: return handler status
>   net: ethernet: ti: cpsw: add XDP support
>
>  drivers/net/ethernet/ti/Kconfig         |   1 +
>  drivers/net/ethernet/ti/cpsw.c          | 552 +++++++++++++++++++++---
>  drivers/net/ethernet/ti/davinci_cpdma.c | 117 +++--
>  drivers/net/ethernet/ti/davinci_cpdma.h |   6 +-
>  drivers/net/ethernet/ti/davinci_emac.c  |  18 +-
>  5 files changed, 591 insertions(+), 103 deletions(-)
>
> --
> 2.17.1
>