net/mlx5e: Switch to using napi_build_skb()

Use napi_build_skb() which uses NAPI percpu caches to obtain
skbuff_head instead of inplace allocation.

napi_build_skb() calls napi_skb_cache_get(), which returns a cached
skb, or allocates a bulk of NAPI_SKB_CACHE_BULK (16) if cache is empty.

Performance test:
TCP single stream, single ring, single core, default MTU (1500B).

Before: 26.5 Gbits/sec
After:  30.1 Gbits/sec (+13.6%)

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>

Author: Tariq Toukan

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -1556,7 +1556,7 @@ struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
 				       u32 frag_size, u16 headroom,
 				       u32 cqe_bcnt, u32 metasize)
 {
-	struct sk_buff *skb = build_skb(va, frag_size);
+	struct sk_buff *skb = napi_build_skb(va, frag_size);
 
 	if (unlikely(!skb)) {
 		rq->stats->buff_alloc_err++;