[PATCH iwl-next v2 11/12] idpf: add support for .ndo_xdp_xmit()

[Alexander Lobakin <aleksander.lobakin@intel.com>]

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.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
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      | 20 ++++++++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/xdp.h b/drivers/net/ethernet/intel/idpf/xdp.h
index 986156162e2d..db8ecc1843fe 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.h
+++ b/drivers/net/ethernet/intel/idpf/xdp.h
@@ -102,5 +102,7 @@ static inline void idpf_xdp_tx_finalize(void *_xdpsq, 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 ad458a3eba66..c2c9267e4254 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -2421,4 +2421,5 @@ static const struct net_device_ops idpf_netdev_ops = {
 	.ndo_hwtstamp_get = idpf_hwtstamp_get,
 	.ndo_hwtstamp_set = idpf_hwtstamp_set,
 	.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 d7ba2848148e..d2549f8b8e24 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.c
+++ b/drivers/net/ethernet/intel/idpf/xdp.c
@@ -320,8 +320,26 @@ LIBETH_XDP_DEFINE_START();
 LIBETH_XDP_DEFINE_TIMER(static idpf_xdp_tx_timer, idpf_xdpsq_complete);
 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();
 
+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))
@@ -376,6 +394,8 @@ static int idpf_xdp_setup_prog(struct idpf_vport *vport,
 	if (old)
 		bpf_prog_put(old);
 
+	libeth_xdp_set_redirect(vport->netdev, vport->xdp_prog);
+
 	return ret;
 }
 
-- 
2.49.0