[xdp-hints] [RFC bpf-next 06/23] ice: Support HW timestamp hint

[Larysa Zaremba <larysa.zaremba@intel.com>]

Use previously refactored code and create a function
that allows XDP code to read HW timestamp.

Also, move cached_phctime into packet context, this way this data still
stays in the ring structure, just at the different address.

HW timestamp is the first supported hint in the driver,
so also add xdp_metadata_ops.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice.h          |  2 ++
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |  2 +-
 drivers/net/ethernet/intel/ice/ice_lib.c      |  2 +-
 drivers/net/ethernet/intel/ice/ice_main.c     |  1 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  3 ++-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  2 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 26 ++++++++++++++++++-
 7 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 5ac0ad12f9f1..34e4731b5d5f 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -951,4 +951,6 @@ static inline void ice_clear_rdma_cap(struct ice_pf *pf)
 	set_bit(ICE_FLAG_UNPLUG_AUX_DEV, pf->flags);
 	clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);
 }
+
+extern const struct xdp_metadata_ops ice_xdp_md_ops;
 #endif /* _ICE_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index ad4d4702129f..f740e0ad0e3c 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -2846,7 +2846,7 @@ ice_set_ringparam(struct net_device *netdev, struct ethtool_ringparam *ring,
 		/* clone ring and setup updated count */
 		rx_rings[i] = *vsi->rx_rings[i];
 		rx_rings[i].count = new_rx_cnt;
-		rx_rings[i].cached_phctime = pf->ptp.cached_phc_time;
+		rx_rings[i].pkt_ctx.cached_phctime = pf->ptp.cached_phc_time;
 		rx_rings[i].desc = NULL;
 		rx_rings[i].rx_buf = NULL;
 		/* this is to allow wr32 to have something to write to
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 927518fcad51..12290defb730 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -1445,7 +1445,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi)
 		ring->netdev = vsi->netdev;
 		ring->dev = dev;
 		ring->count = vsi->num_rx_desc;
-		ring->cached_phctime = pf->ptp.cached_phc_time;
+		ring->pkt_ctx.cached_phctime = pf->ptp.cached_phc_time;
 		WRITE_ONCE(vsi->rx_rings[i], ring);
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 0f04347eda39..557c6326ff87 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3395,6 +3395,7 @@ static void ice_set_ops(struct ice_vsi *vsi)
 
 	netdev->netdev_ops = &ice_netdev_ops;
 	netdev->udp_tunnel_nic_info = &pf->hw.udp_tunnel_nic;
+	netdev->xdp_metadata_ops = &ice_xdp_md_ops;
 	ice_set_ethtool_ops(netdev);
 
 	if (vsi->type != ICE_VSI_PF)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index a31333972c68..26fad7038996 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1038,7 +1038,8 @@ static int ice_ptp_update_cached_phctime(struct ice_pf *pf)
 		ice_for_each_rxq(vsi, j) {
 			if (!vsi->rx_rings[j])
 				continue;
-			WRITE_ONCE(vsi->rx_rings[j]->cached_phctime, systime);
+			WRITE_ONCE(vsi->rx_rings[j]->pkt_ctx.cached_phctime,
+				   systime);
 		}
 	}
 	clear_bit(ICE_CFG_BUSY, pf->state);
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index d0ab2c4c0c91..4237702a58a9 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -259,6 +259,7 @@ enum ice_rx_dtype {
 
 struct ice_pkt_ctx {
 	const union ice_32b_rx_flex_desc *eop_desc;
+	u64 cached_phctime;
 };
 
 struct ice_xdp_buff {
@@ -354,7 +355,6 @@ struct ice_rx_ring {
 	struct ice_tx_ring *xdp_ring;
 	struct xsk_buff_pool *xsk_pool;
 	dma_addr_t dma;			/* physical address of ring */
-	u64 cached_phctime;
 	u16 rx_buf_len;
 	u8 dcb_tc;			/* Traffic class of ring */
 	u8 ptp_rx;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 07241f4229b7..463d9e5cbe05 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -233,7 +233,7 @@ ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
 {
 	u64 ts_ns, cached_time;
 
-	cached_time = READ_ONCE(rx_ring->cached_phctime);
+	cached_time = READ_ONCE(rx_ring->pkt_ctx.cached_phctime);
 	ts_ns = ice_ptp_get_rx_hwts(rx_desc, cached_time);
 
 	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
@@ -546,3 +546,27 @@ void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res,
 			spin_unlock(&xdp_ring->tx_lock);
 	}
 }
+
+/**
+ * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler
+ * @ctx: XDP buff pointer
+ * @ts_ns: destination address
+ *
+ * Copy HW timestamp (if available) to the destination address.
+ */
+static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+	u64 cached_time;
+
+	cached_time = READ_ONCE(xdp_ext->pkt_ctx.cached_phctime);
+	*ts_ns = ice_ptp_get_rx_hwts(xdp_ext->pkt_ctx.eop_desc, cached_time);
+	if (!*ts_ns)
+		return -ENODATA;
+
+	return 0;
+}
+
+const struct xdp_metadata_ops ice_xdp_md_ops = {
+	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
+};
-- 
2.41.0