[PATCH intel-net 2/3] ice: move headroom initialization to ice_setup_rx_ctx

[Maciej Fijalkowski]

ice_rx_offset(), that is supposed to initialize the Rx buffer headroom,
relies on ICE_RX_FLAGS_RING_BUILD_SKB flag as well as XDP prog presence.

Currently, the callsite of mentioned function is placed incorrectly
within ice_setup_rx_ring() where Rx ring's build skb flag is not
set yet. This causes the XDP_REDIRECT to be partially broken due to
inability to create xdp_frame in the headroom space, as the headroom is
0.

Fix this by moving ice_rx_offset() to ice_setup_rx_ctx() after the flag
setting.

Fixes: f1b1f409bf79 ("ice: store the result of ice_rx_offset() onto ice_ring")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkow...@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_base.c | 18 ++++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_txrx.c | 17 -----------------
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_base.c 
b/drivers/net/ethernet/intel/ice/ice_base.c
index 3124a3bf519a..95f674bd52c3 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -274,6 +274,22 @@ ice_setup_tx_ctx(struct ice_ring *ring, struct 
ice_tlan_ctx *tlan_ctx, u16 pf_q)
        tlan_ctx->legacy_int = ICE_TX_LEGACY;
 }
 
+/**
+ * ice_rx_offset - Return expected offset into page to access data
+ * @rx_ring: Ring we are requesting offset of
+ *
+ * Returns the offset value for ring into the data buffer.
+ */
+static unsigned int ice_rx_offset(struct ice_ring *rx_ring)
+{
+       if (ice_ring_uses_build_skb(rx_ring))
+               return ICE_SKB_PAD;
+       else if (ice_is_xdp_ena_vsi(rx_ring->vsi))
+               return XDP_PACKET_HEADROOM;
+
+       return 0;
+}
+
 /**
  * ice_setup_rx_ctx - Configure a receive ring context
  * @ring: The Rx ring to configure
@@ -413,6 +429,8 @@ int ice_setup_rx_ctx(struct ice_ring *ring)
        else
                ice_set_ring_build_skb_ena(ring);
 
+       ring->rx_offset = ice_rx_offset(ring);
+
        /* init queue specific tail register */
        ring->tail = hw->hw_addr + QRX_TAIL(pf_q);
        writel(0, ring->tail);
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c 
b/drivers/net/ethernet/intel/ice/ice_txrx.c
index b7dc25da1202..b91dcfd12727 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -443,22 +443,6 @@ void ice_free_rx_ring(struct ice_ring *rx_ring)
        }
 }
 
-/**
- * ice_rx_offset - Return expected offset into page to access data
- * @rx_ring: Ring we are requesting offset of
- *
- * Returns the offset value for ring into the data buffer.
- */
-static unsigned int ice_rx_offset(struct ice_ring *rx_ring)
-{
-       if (ice_ring_uses_build_skb(rx_ring))
-               return ICE_SKB_PAD;
-       else if (ice_is_xdp_ena_vsi(rx_ring->vsi))
-               return XDP_PACKET_HEADROOM;
-
-       return 0;
-}
-
 /**
  * ice_setup_rx_ring - Allocate the Rx descriptors
  * @rx_ring: the Rx ring to set up
@@ -493,7 +477,6 @@ int ice_setup_rx_ring(struct ice_ring *rx_ring)
 
        rx_ring->next_to_use = 0;
        rx_ring->next_to_clean = 0;
-       rx_ring->rx_offset = ice_rx_offset(rx_ring);
 
        if (ice_is_xdp_ena_vsi(rx_ring->vsi))
                WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
-- 
2.20.1