[PATCH net-next 15/16] idpf: add support for .ndo_xdp_xmit()

Alexander Lobakin
2025-03-05T16:23:19Z

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@intel.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