[PATCH net-next v2 1/7] net: mvneta: Add metadata support for xdp mode

[Lorenzo Bianconi]

Set metadata size building the skb from xdp_buff in mvneta driver
mvneta sets xdp headroom to:

MVNETA_MH_SIZE + MVNETA_SKB_HEADROOM

where

MVNETA_MH_SIZE 2
MVNETA_SKB_HEADROOM max(NET_SKB_PAD, XDP_PACKET_HEADROOM)

so the headroom is large enough to contain xdp_frame and xdp metadata.

Reviewed-by: Michal Kubiak <michal.kub...@intel.com>
Signed-off-by: Lorenzo Bianconi <lore...@kernel.org>
---
 drivers/net/ethernet/marvell/mvneta.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c 
b/drivers/net/ethernet/marvell/mvneta.c
index 
44b18c57390927e37eac267632cace656bb5526e..147571fdada378e430fd96f2fb4a7e7870b784a2
 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2342,7 +2342,7 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
        prefetch(data);
        xdp_buff_clear_frags_flag(xdp);
        xdp_prepare_buff(xdp, data, pp->rx_offset_correction + MVNETA_MH_SIZE,
-                        data_len, false);
+                        data_len, true);
 }
 
 static void
@@ -2396,6 +2396,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct 
page_pool *pool,
                      struct xdp_buff *xdp, u32 desc_status)
 {
        struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
+       u32 metasize = xdp->data - xdp->data_meta;
        struct sk_buff *skb;
        u8 num_frags;
 
@@ -2410,6 +2411,8 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct 
page_pool *pool,
 
        skb_reserve(skb, xdp->data - xdp->data_hard_start);
        skb_put(skb, xdp->data_end - xdp->data);
+       if (metasize)
+               skb_metadata_set(skb, metasize);
        skb->ip_summed = mvneta_rx_csum(pp, desc_status);
 
        if (unlikely(xdp_buff_has_frags(xdp)))

-- 
2.48.1