linux-kernel - [PATCH net-next 15/16] idpf: add support for .ndo_xdp

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Message-ID: <20250305162132.1106080-16-aleksander.lobakin@intel.com>
Date: Wed,  5 Mar 2025 17:21:31 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Michal Kubiak <michal.kubiak@...el.com>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Simon Horman <horms@...nel.org>,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 15/16] idpf: add support for .ndo_xdp_xmit()

Use libeth XDP infra to implement .ndo_xdp_xmit() in idpf.
The Tx callbacks are reused from XDP_TX code. XDP redirect target
feature is set/cleared depending on the XDP prog presence, as for now
we still don't allocate XDP Tx queues when there's no program.

Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
 drivers/net/ethernet/intel/idpf/xdp.h      |  2 ++
 drivers/net/ethernet/intel/idpf/idpf_lib.c |  1 +
 drivers/net/ethernet/intel/idpf/xdp.c      | 29 ++++++++++++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/xdp.h b/drivers/net/ethernet/intel/idpf/xdp.h
index fde85528a315..a2ac1b2f334f 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.h
+++ b/drivers/net/ethernet/intel/idpf/xdp.h
@@ -110,5 +110,7 @@ static inline void idpf_xdp_tx_finalize(void *_xdpq, bool sent, bool flush)
 void idpf_xdp_set_features(const struct idpf_vport *vport);
 
 int idpf_xdp(struct net_device *dev, struct netdev_bpf *xdp);
+int idpf_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+		  u32 flags);
 
 #endif /* _IDPF_XDP_H_ */
diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
index 2d1efcb854be..39b9885293a9 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -2371,4 +2371,5 @@ static const struct net_device_ops idpf_netdev_ops = {
 	.ndo_set_features = idpf_set_features,
 	.ndo_tx_timeout = idpf_tx_timeout,
 	.ndo_bpf = idpf_xdp,
+	.ndo_xdp_xmit = idpf_xdp_xmit,
 };
diff --git a/drivers/net/ethernet/intel/idpf/xdp.c b/drivers/net/ethernet/intel/idpf/xdp.c
index abf75e840c0a..1834f217a07f 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.c
+++ b/drivers/net/ethernet/intel/idpf/xdp.c
@@ -357,8 +357,35 @@ LIBETH_XDP_DEFINE_START();
 LIBETH_XDP_DEFINE_TIMER(static idpf_xdp_tx_timer, idpf_clean_xdp_irq);
 LIBETH_XDP_DEFINE_FLUSH_TX(idpf_xdp_tx_flush_bulk, idpf_xdp_tx_prep,
 			   idpf_xdp_tx_xmit);
+LIBETH_XDP_DEFINE_FLUSH_XMIT(static idpf_xdp_xmit_flush_bulk, idpf_xdp_tx_prep,
+			     idpf_xdp_tx_xmit);
 LIBETH_XDP_DEFINE_END();
 
+/**
+ * idpf_xdp_xmit - send frames queued by ``XDP_REDIRECT`` to this interface
+ * @dev: network device
+ * @n: number of frames to transmit
+ * @frames: frames to transmit
+ * @flags: transmit flags (``XDP_XMIT_FLUSH`` or zero)
+ *
+ * Return: number of frames successfully sent or -errno on error.
+ */
+int idpf_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+		  u32 flags)
+{
+	const struct idpf_netdev_priv *np = netdev_priv(dev);
+	const struct idpf_vport *vport = np->vport;
+
+	if (unlikely(!netif_carrier_ok(dev) || !vport->link_up))
+		return -ENETDOWN;
+
+	return libeth_xdp_xmit_do_bulk(dev, n, frames, flags,
+				       &vport->txqs[vport->xdp_txq_offset],
+				       vport->num_xdp_txq,
+				       idpf_xdp_xmit_flush_bulk,
+				       idpf_xdp_tx_finalize);
+}
+
 void idpf_xdp_set_features(const struct idpf_vport *vport)
 {
 	if (!idpf_is_queue_model_split(vport->rxq_model))
@@ -417,6 +444,8 @@ idpf_xdp_setup_prog(struct idpf_vport *vport, const struct netdev_bpf *xdp)
 		cfg->user_config.xdp_prog = old;
 	}
 
+	libeth_xdp_set_redirect(vport->netdev, vport->xdp_prog);
+
 	return ret;
 }
 
-- 
2.48.1