[PATCH bpf-next 1/6] nfp: move repr handling on RX path

[Jakub Kicinski]

Representor packets are received on PF queues with special metadata tag
for demux.  There is no reason to resolve the representor ID -> netdev
after the skb has been allocated.  Move the code, this will allow us to
handle special FW messages without SKB allocation overhead.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vanderme...@netronome.com>
---
 .../ethernet/netronome/nfp/nfp_net_common.c   | 29 ++++++++++---------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index cf1704e972b7..cdfbd1e8bf4b 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1757,6 +1757,21 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, 
int budget)
                        }
                }
 
+               if (likely(!meta.portid)) {
+                       netdev = dp->netdev;
+               } else {
+                       struct nfp_net *nn;
+
+                       nn = netdev_priv(dp->netdev);
+                       netdev = nfp_app_repr_get(nn->app, meta.portid);
+                       if (unlikely(!netdev)) {
+                               nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf,
+                                               NULL);
+                               continue;
+                       }
+                       nfp_repr_inc_rx_stats(netdev, pkt_len);
+               }
+
                skb = build_skb(rxbuf->frag, true_bufsz);
                if (unlikely(!skb)) {
                        nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
@@ -1772,20 +1787,6 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, 
int budget)
 
                nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
 
-               if (likely(!meta.portid)) {
-                       netdev = dp->netdev;
-               } else {
-                       struct nfp_net *nn;
-
-                       nn = netdev_priv(dp->netdev);
-                       netdev = nfp_app_repr_get(nn->app, meta.portid);
-                       if (unlikely(!netdev)) {
-                               nfp_net_rx_drop(dp, r_vec, rx_ring, NULL, skb);
-                               continue;
-                       }
-                       nfp_repr_inc_rx_stats(netdev, pkt_len);
-               }
-
                skb_reserve(skb, pkt_off);
                skb_put(skb, pkt_len);
 
-- 
2.17.1