xen networking: add basic XDP support for xen-netfront

The patch adds a basic XDP processing to xen-netfront driver. We ran an XDP program for an RX response received from netback driver. Also we request xen-netback to adjust data offset for bpf_xdp_adjust_head() header space for custom headers. synchronization between frontend and backend parts is done by using xenbus state switching: Reconfiguring -> Reconfigured- > Connected UDP packets drop rate using xdp program is around 310 kpps using ./pktgen_sample04_many_flows.sh and 160 kpps without the patch. Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org> Signed-off-by: David S. Miller <davem@davemloft.net>
torvalds · Jul 1, 2020 · 6c5aa6f · 6c5aa6f
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diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
@@ -495,6 +495,7 @@ config XEN_NETDEV_FRONTEND
 	tristate "Xen network device frontend driver"
 	depends on XEN
 	select XEN_XENBUS_FRONTEND
+	select PAGE_POOL
 	default y
 	help
 	  This driver provides support for Xen paravirtual network