mlxsw: pci: Optimize data buffer access

Before accessing data buffer, call net_prefetch() to load it into the
cache. This change improves driver performance, CPU can handle about
7.1% more packets per second.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/1fa07c510890866a6f201163ab7e78890ba28b3b.1718709196.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/pci.c

@@ -396,6 +396,7 @@ static struct sk_buff *mlxsw_pci_rdq_build_skb(struct page *page,
 	unsigned int allocated_size;
 	struct sk_buff *skb;
 
+	net_prefetch(data);
 	allocated_size = page_size(page);
 	skb = napi_build_skb(data, allocated_size);
 	if (unlikely(!skb))