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SubjectRe: [RFC PATCH 0/3] net: ethernet: ti: cpsw: Add XDP support
On Thu, Apr 18, 2019 at 08:12:06AM +0200, Björn Töpel wrote:
>On Wed, 17 Apr 2019 at 19:51, Ivan Khoronzhuk
><ivan.khoronzhuk@linaro.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]
I more bothering about this fast fix (not investigated deep enough):
https://github.com/ikhorn/af_xdp_stuff/commit/f77cd4faf95ad744bbf37d0ba81d0ec79c1b0d29

That's about when page_address(umem->pgs[i]) returns nothing.

>
>
>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
>>

--
Regards,
Ivan Khoronzhuk

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