netdev - [PATCH net-next v3 3/4] net: stmmac: add Rx HWTS metadata to XDP receive pkt

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Message-Id: <20230412094235.589089-4-yoong.siang.song@intel.com>
Date:   Wed, 12 Apr 2023 17:42:34 +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 v3 3/4] net: stmmac: add Rx HWTS metadata to XDP receive pkt

Add receive hardware timestamp metadata support via kfunc to XDP receive
packets.

Suggested-by: Stanislav Fomichev <sdf@...gle.com>
Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  3 +++
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 26 ++++++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index ac8ccf851708..826ac0ec88c6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -94,6 +94,9 @@ struct stmmac_rx_buffer {
 
 struct stmmac_xdp_buff {
 	struct xdp_buff xdp;
+	struct stmmac_priv *priv;
+	struct dma_desc *p;
+	struct dma_desc *np;
 };
 
 struct stmmac_rx_queue {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index f7bbdf04d20c..ed660927b628 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5315,10 +5315,15 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 
 			xdp_init_buff(&ctx.xdp, buf_sz, &rx_q->xdp_rxq);
 			xdp_prepare_buff(&ctx.xdp, page_address(buf->page),
-					 buf->page_offset, buf1_len, false);
+					 buf->page_offset, buf1_len, true);
 
 			pre_len = ctx.xdp.data_end - ctx.xdp.data_hard_start -
 				  buf->page_offset;
+
+			ctx.priv = priv;
+			ctx.p = p;
+			ctx.np = np;
+
 			skb = stmmac_xdp_run_prog(priv, &ctx.xdp);
 			/* Due xdp_adjust_tail: DMA sync for_device
 			 * cover max len CPU touch
@@ -7071,6 +7076,23 @@ void stmmac_fpe_handshake(struct stmmac_priv *priv, bool enable)
 	}
 }
 
+static int stmmac_xdp_rx_timestamp(const struct xdp_md *_ctx, u64 *timestamp)
+{
+	const struct stmmac_xdp_buff *ctx = (void *)_ctx;
+
+	*timestamp = 0;
+	stmmac_get_rx_hwtstamp(ctx->priv, ctx->p, ctx->np, timestamp);
+
+	if (*timestamp)
+		return 0;
+
+	return -ENODATA;
+}
+
+static const struct xdp_metadata_ops stmmac_xdp_metadata_ops = {
+	.xmo_rx_timestamp		= stmmac_xdp_rx_timestamp,
+};
+
 /**
  * stmmac_dvr_probe
  * @device: device pointer
@@ -7178,6 +7200,8 @@ int stmmac_dvr_probe(struct device *device,
 
 	ndev->netdev_ops = &stmmac_netdev_ops;
 
+	ndev->xdp_metadata_ops = &stmmac_xdp_metadata_ops;
+
 	ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 			    NETIF_F_RXCSUM;
 	ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
-- 
2.34.1