[PATCH net-next v2 3/7] net: netsec: Add metadata support for xdp mode

[Lorenzo Bianconi]

Set metadata size building the skb from xdp_buff in netsec driver.
netsec driver sets xdp headroom to NETSEC_RXBUF_HEADROOM:

NETSEC_RXBUF_HEADROOM max(XDP_PACKET_HEADROOM, NET_SKB_PAD) + NET_IP_ALIGN

so the headroom is large enough to contain xdp_frame and xdp metadata.
Please note this patch is just compiled tested.

Acked-by: Ilias Apalodimas <ilias.apalodi...@linaro.org>
Reviewed-by: Michal Kubiak <michal.kub...@intel.com>
Signed-off-by: Lorenzo Bianconi <lore...@kernel.org>
---
 drivers/net/ethernet/socionext/netsec.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/socionext/netsec.c 
b/drivers/net/ethernet/socionext/netsec.c
index 
dc99821c6226fbaece65c8ade23899f610b44a9a..ee890de69ffe795dbdcc5331e36be86769f0d9a6
 100644
--- a/drivers/net/ethernet/socionext/netsec.c
+++ b/drivers/net/ethernet/socionext/netsec.c
@@ -970,7 +970,7 @@ static int netsec_process_rx(struct netsec_priv *priv, int 
budget)
                struct netsec_de *de = dring->vaddr + (DESC_SZ * idx);
                struct netsec_desc *desc = &dring->desc[idx];
                struct page *page = virt_to_page(desc->addr);
-               u32 xdp_result = NETSEC_XDP_PASS;
+               u32 metasize, xdp_result = NETSEC_XDP_PASS;
                struct sk_buff *skb = NULL;
                u16 pkt_len, desc_len;
                dma_addr_t dma_handle;
@@ -1019,7 +1019,7 @@ static int netsec_process_rx(struct netsec_priv *priv, 
int budget)
                prefetch(desc->addr);
 
                xdp_prepare_buff(&xdp, desc->addr, NETSEC_RXBUF_HEADROOM,
-                                pkt_len, false);
+                                pkt_len, true);
 
                if (xdp_prog) {
                        xdp_result = netsec_run_xdp(priv, xdp_prog, &xdp);
@@ -1048,6 +1048,9 @@ static int netsec_process_rx(struct netsec_priv *priv, 
int budget)
 
                skb_reserve(skb, xdp.data - xdp.data_hard_start);
                skb_put(skb, xdp.data_end - xdp.data);
+               metasize = xdp.data - xdp.data_meta;
+               if (metasize)
+                       skb_metadata_set(skb, metasize);
                skb->protocol = eth_type_trans(skb, priv->ndev);
 
                if (priv->rx_cksum_offload_flag &&

-- 
2.48.1