From: "naamax.meir" <naamax.meir@linux.intel.com>
To: Song Yoong Siang <yoong.siang.song@intel.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Tony Nguyen <anthony.l.nguyen@intel.com>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
Vedang Patel <vedang.patel@intel.com>,
Jithu Joseph <jithu.joseph@intel.com>,
Andre Guedes <andre.guedes@intel.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Stanislav Fomichev <sdf@google.com>,
Jacob Keller <jacob.e.keller@intel.com>,
David Laight <David.Laight@ACULAB.COM>
Cc: xdp-hints@xdp-project.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
intel-wired-lan@lists.osuosl.org, bpf@vger.kernel.org
Subject: [xdp-hints] Re: [Intel-wired-lan] [PATCH net v3 1/1] igc: read before write to SRRCTL register
Date: Sun, 30 Apr 2023 08:05:57 +0300 [thread overview]
Message-ID: <499598fd-05fc-e3bc-be85-d74b47a0b46c@linux.intel.com> (raw)
In-Reply-To: <20230414154902.2950535-1-yoong.siang.song@intel.com>
On 4/14/2023 18:49, Song Yoong Siang wrote:
> igc_configure_rx_ring() function will be called as part of XDP program
> setup. If Rx hardware timestamp is enabled prio to XDP program setup,
> this timestamp enablement will be overwritten when buffer size is
> written into SRRCTL register.
>
> Thus, this commit read the register value before write to SRRCTL
> register. This commit is tested by using xdp_hw_metadata bpf selftest
> tool. The tool enables Rx hardware timestamp and then attach XDP program
> to igc driver. It will display hardware timestamp of UDP packet with
> port number 9092. Below are detail of test steps and results.
>
> Command on DUT:
> sudo ./xdp_hw_metadata <interface name>
>
> Command on Link Partner:
> echo -n skb | nc -u -q1 <destination IPv4 addr> 9092
>
> Result before this patch:
> skb hwtstamp is not found!
>
> Result after this patch:
> found skb hwtstamp = 1677800973.642836757
>
> Optionally, read PHC to confirm the values obtained are almost the same:
> Command:
> sudo ./testptp -d /dev/ptp0 -g
> Result:
> clock time: 1677800973.913598978 or Fri Mar 3 07:49:33 2023
>
> Fixes: fc9df2a0b520 ("igc: Enable RX via AF_XDP zero-copy")
> Cc: <stable@vger.kernel.org> # 5.14+
> Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
> Reviewed-by: Jesper Dangaard Brouer <brouer@redhat.com>
> ---
> v2 -> v3: Refactor SRRCTL definitions to more human readable definitions
> v1 -> v2: Fix indention
> ---
> drivers/net/ethernet/intel/igc/igc_base.h | 11 ++++++++---
> drivers/net/ethernet/intel/igc/igc_main.c | 7 +++++--
> 2 files changed, 13 insertions(+), 5 deletions(-)
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
prev parent reply other threads:[~2023-04-30 5:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-14 15:49 [xdp-hints] " Song Yoong Siang
2023-04-14 20:05 ` [xdp-hints] " Jesper Dangaard Brouer
2023-04-17 14:24 ` Jesper Dangaard Brouer
2023-04-18 9:31 ` Florian Bezdeka
2023-04-15 9:19 ` Florian Bezdeka
2023-04-16 2:19 ` Song, Yoong Siang
2023-04-17 2:53 ` Zulkifli, Muhammad Husaini
2023-04-17 18:50 ` Jakub Kicinski
2023-04-30 5:05 ` naamax.meir [this message]
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