linux-kernel - [PATCH net-next v4 0/3] XDP Rx HWTS metadata for stmmac driver

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Message-Id: <20230413032541.885238-1-yoong.siang.song@intel.com>
Date:   Thu, 13 Apr 2023 11:25:38 +0800
From:   Song Yoong Siang <yoong.siang.song@...el.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, xdp-hints@...-project.net,
        Song Yoong Siang <yoong.siang.song@...el.com>
Subject: [PATCH net-next v4 0/3] XDP Rx HWTS metadata for stmmac driver

Implemented XDP receive hardware timestamp metadata for stmmac driver.

This patchset is tested with tools/testing/selftests/bpf/xdp_hw_metadata.
Below are the test steps and results.

Command on DUT:
	sudo ./xdp_hw_metadata <interface name>

Command on Link Partner:
	echo -n xdp | nc -u -q1 <destination IPv4 addr> 9091
	echo -n skb | nc -u -q1 <destination IPv4 addr> 9092

Result for port 9091:
	0x55fdb5f006d0: rx_desc[3]->addr=1000000003bd000 addr=3bd100 comp_addr=3bd000
	rx_timestamp: 1677762474360150047
	rx_hash: 0
	0x55fdb5f006d0: complete idx=515 addr=3bd000

Result for port 9092:
	found skb hwtstamp = 1677762476.320146161

Changes since v3:
 * directly retrieve Rx HWTS in stmmac_xdp_rx_timestamp(), instead of reuse
   stmmac_get_rx_hwtstamp()

Changes since v2:
 * To reduce packet processing cost, get the Rx HWTS only when xmo_rx_timestamp()
   is called

Changes since v1:
 * Add static to stmmac_xdp_metadata_ops declaration

---

Song Yoong Siang (3):
  net: stmmac: introduce wrapper for struct xdp_buff
  net: stmmac: add Rx HWTS metadata to XDP receive pkt
  net: stmmac: add Rx HWTS metadata to XDP ZC receive pkt

 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  7 ++
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 80 ++++++++++++++++---
 2 files changed, 77 insertions(+), 10 deletions(-)

-- 
2.34.1