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Message-ID: <ae89be50-9cc0-43a0-8829-dd38a05a377f@kernel.org>
Date: Fri, 23 Aug 2024 17:19:05 +0300
From: Roger Quadros <rogerq@...nel.org>
To: Julien Panis <jpanis@...libre.com>, "David S. Miller"
<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Simon Horman <horms@...nel.org>, Andrew Lunn <andrew@...n.ch>,
Ratheesh Kannoth <rkannoth@...vell.com>,
Naveen Mamindlapalli <naveenm@...vell.com>,
Jacob Keller <jacob.e.keller@...el.com>
Cc: danishanwar@...com, yuehaibing@...wei.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linaro-mm-sig@...ts.linaro.org, "Govindarajan, Sriramakrishnan" <srk@...com>
Subject: Re: [PATCH net-next v9 0/3] Add minimal XDP support to TI AM65 CPSW
Ethernet driver
On 23/08/2024 15:12, Roger Quadros wrote:
> Hello Julien,
>
> On 12/04/2024 18:38, Julien Panis wrote:
>> This patch adds XDP support to TI AM65 CPSW Ethernet driver.
>>
>> The following features are implemented: NETDEV_XDP_ACT_BASIC,
>> NETDEV_XDP_ACT_REDIRECT, and NETDEV_XDP_ACT_NDO_XMIT.
>>
>> Zero-copy and non-linear XDP buffer supports are NOT implemented.
>>
>> Besides, the page pool memory model is used to get better performance.
>>
>> Signed-off-by: Julien Panis <jpanis@...libre.com>
>
> I've been trying to test this since I don't want my RX multi queue series [1]
> to break AF_XDP feature. However, with 6.10 I don't see AF_XDP working at all
> and even breaking basic networking on am65-cpsw.
>
> The in kernel XDP tests have been dropped so I've been using xdp-tools [2]
>
> My test is to try XDP_DROP with xdp-bench using skb mode first and then
> native XDP mode.
>
> Below is the test log. You can see that skb mode works fine. The moment I try
> native XDP mode the interface seems to go down and up and then just locks up.
>
> I can no longer ping to the remote host.
>
> ----test log starts-----
>
> root@...4xx-evm:~/xdp-tools/xdp-bench# ping 192.168.1.36
> PING 192.168.1.36 (192.168.1.36) 56(84) bytes of data.
> 64 bytes from 192.168.1.36: icmp_seq=1 ttl=64 time=0.801 ms
> 64 bytes from 192.168.1.36: icmp_seq=2 ttl=64 time=0.967 ms
> 64 bytes from 192.168.1.36: icmp_seq=3 ttl=64 time=0.876 ms
> ^C
> --- 192.168.1.36 ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> rtt min/avg/max/mdev = 0.801/0.881/0.967/0.067 ms
>
>
> root@...4xx-evm:~/xdp-tools/xdp-bench# ./xdp-bench drop -m skb eth0
> Dropping packets on eth0 (ifindex 2; driver am65-cpsw-nuss)
> Summary 81127 rx/s 0 err/s
> Summary 81088 rx/s 0 err/s
> Summary 81089 rx/s 0 err/s
> Summary 53065 rx/s 0 err/s
> ^C
> Packets received : 296369
> Average packets/s : 74092
> Rx dropped : 296369
>
> root@...4xx-evm:~/xdp-tools/xdp-bench# ping 192.168.1.36
> PING 192.168.1.36 (192.168.1.36) 56(84) bytes of data.
> 64 bytes from 192.168.1.36: icmp_seq=1 ttl=64 time=1.02 ms
> 64 bytes from 192.168.1.36: icmp_seq=2 ttl=64 time=0.756 ms
> 64 bytes from 192.168.1.36: icmp_seq=3 ttl=64 time=0.963 ms
> ^C
> --- 192.168.1.36 ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> rtt min/avg/max/mdev = 0.756/0.914/1.024/0.114 ms
>
>
> root@...4xx-evm:~/xdp-tools/xdp-bench# ./xdp-bench drop -m native eth0
> [ 889.096851] am65-cpsw-nuss 8000000.ethernet eth0: Link is Down
> [ 889.110889] am65-cpsw-nuss 8000000.ethernet eth0: PHY [8000f00.mdio:00] driver [TI DP83867] (irq=POLL)
> [ 889.120377] am65-cpsw-nuss 8000000.ethernet eth0: configuring for phy/rgmii-rxid link mode
> Dropping packets on eth0 (ifindex 2; driver am65-cpsw-nuss)
> Summary 0 rx/s 0 err/s
> Summary 0 rx/s 0 err/s
> [ 893.218318] am65-cpsw-nuss 8000000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> Summary 250 rx/s 0 err/s
> Summary 0 rx/s 0 err/s
> Summary 0 rx/s 0 err/s
> Summary 0 rx/s 0 err/s
> ^C
> [ 901.898170] am65-cpsw-nuss 8000000.ethernet eth0: Link is Down
> [ 901.910292] am65-cpsw-nuss 8000000.ethernet eth0: PHY [8000f00.mdio:00] driver [TI DP83867] (irq=POLL)
> [ 901.919661] am65-cpsw-nuss 8000000.ethernet eth0: configuring for phy/rgmii-rxid link mode
> Packets received : 250
> Average packets/s : 42
> Rx dropped : 250
> root@...4xx-evm:~/xdp-tools/xdp-bench# [ 906.018296] am65-cpsw-nuss 8000000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
>
> root@...4xx-evm:~/xdp-tools/xdp-bench# ping 192.168.1.36
> PING 192.168.1.36 (192.168.1.36) 56(84) bytes of data.
> From 192.168.1.100 icmp_seq=1 Destination Host Unreachable
> From 192.168.1.100 icmp_seq=2 Destination Host Unreachable
> From 192.168.1.100 icmp_seq=3 Destination Host Unreachable
> ^C
>
> --- 192.168.1.36 ping statistics ---
> 5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4079ms
> pipe 4
>
>
> ---test log ends---
>
> I will try to test with commit 8acacc40f733 ("net: ethernet: ti: am65-cpsw: Add minimal XDP support")
> to see if it works there. If it does then I can do a bisect.
XDP_DROP doesn't work here either. I think I have found the issue.
I will comment about it on patch 3.
>
> If you have better ideas please let me know. Thanks!
>
> [1] https://lore.kernel.org/all/20240703-am65-cpsw-multi-rx-v3-0-f11cd860fd72@kernel.org/
> [2] https://github.com/xdp-project/xdp-tools
>
>> ---
>> Changes in v9:
>> - In k3_cppi_desc_pool_destroy(), free memory allocated for pool.
>> - In k3_cppi_desc_pool_create_name() function, remove unnecessary
>> error messages on mem alloc failures.
>> - In k3_cppi_desc_pool_create_name() function, move desc_infos alloc
>> forward to leverage pool_name freeing in gen_pool_destroy().
>> - In k3_cppi_desc_pool_create_name() function, remove unnecessary
>> 'ret = -ENOMEM' since ret is already initialized with -ENOMEM value.
>> - For rx, do not build the skb upfront any more, Instead, give the page
>> to the HW then build the skb once HW sends a completion.
>> - Link to v8: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v8-0-f3421b58da09@baylibre.com
>>
>> Changes in v8:
>> - Fix some warnings reported by patchwork.
>> - Link to v7: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v7-0-c3857c82dadb@baylibre.com
>>
>> Changes in v7:
>> - Move xdp_do_flush() function call in am65_cpsw_nuss_rx_poll().
>> - Link to v6: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v6-0-212eeff5bd5f@baylibre.com
>>
>> Changes in v6:
>> - In k3_cppi_*() functions, use const qualifier when the content of
>> pool is not modified.
>> - Add allow_direct bool parameter to am65_cpsw_alloc_skb() function
>> for direct use by page_pool_put_full_page().
>> - Link to v5: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v5-0-bc1739170bc6@baylibre.com
>>
>> Changes in v5:
>> - In k3_cppi_desc_pool_destroy(), free memory allocated for desc_infos.
>> - Link to v4: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v4-0-2e45e5dec048@baylibre.com
>>
>> Changes in v4:
>> - Add skb_mark_for_recycle() in am65_cpsw_nuss_rx_packets() function.
>> - Specify napi page pool parameter in am65_cpsw_create_xdp_rxqs() function.
>> - Add benchmark numbers (with VS without page pool) in the commit description.
>> - Add xdp_do_flush() in am65_cpsw_run_xdp() function for XDP_REDIRECT case.
>> - Link to v3: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v3-0-5d944a9d84a0@baylibre.com
>>
>> Changes in v3:
>> - Fix a potential issue with TX buffer type, which is now set for each buffer.
>> - Link to v2: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v2-0-01c6caacabb6@baylibre.com
>>
>> Changes in v2:
>> - Use page pool memory model instead of MEM_TYPE_PAGE_ORDER0.
>> - In am65_cpsw_alloc_skb(), release reference on the page pool page
>> in case of error returned by build_skb().
>> - [nit] Cleanup am65_cpsw_nuss_common_open/stop() functions.
>> - [nit] Arrange local variables in reverse xmas tree order.
>> - Link to v1: https://lore.kernel.org/r/20240223-am65-cpsw-xdp-basic-v1-1-9f0b6cbda310@baylibre.com
>>
>> ---
>> Julien Panis (3):
>> net: ethernet: ti: Add accessors for struct k3_cppi_desc_pool members
>> net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc_pool
>> net: ethernet: ti: am65-cpsw: Add minimal XDP support
>>
>> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 659 ++++++++++++++++++++++++----
>> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 13 +
>> drivers/net/ethernet/ti/k3-cppi-desc-pool.c | 46 +-
>> drivers/net/ethernet/ti/k3-cppi-desc-pool.h | 6 +
>> 4 files changed, 623 insertions(+), 101 deletions(-)
>> ---
>> base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
>> change-id: 20240223-am65-cpsw-xdp-basic-4db828508b48
>>
>> Best regards,
>
--
cheers,
-roger
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