[dpdk-dev] [PATCH 09/23] net/sfc: conditionally compile support for tunnel packets

[Andrew Rybchenko <arybchenko@solarflare.com>]

Equal stride super-buffer Rx datapath does not support tunnels, code to
parse tunnel packet types and inner checksum offload is not required and
it is important to be able to compile it out on build time to avoid
extra CPU load.

Cutting of tunnels support relies on compiler optimizaitons to
be able to drop extra checks and branches if tun_ptype is always 0.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Ivan Malov <ivan.malov@oktetlabs.ru>
---
 drivers/net/sfc/sfc_ef10_rx.c    | 2 ++
 drivers/net/sfc/sfc_ef10_rx_ev.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/sfc/sfc_ef10_rx.c b/drivers/net/sfc/sfc_ef10_rx.c
index 7560891..5ec82db 100644
--- a/drivers/net/sfc/sfc_ef10_rx.c
+++ b/drivers/net/sfc/sfc_ef10_rx.c
@@ -25,6 +25,8 @@
 #include "sfc_dp_rx.h"
 #include "sfc_kvargs.h"
 #include "sfc_ef10.h"
+
+#define SFC_EF10_RX_EV_ENCAP_SUPPORT	1
 #include "sfc_ef10_rx_ev.h"
 
 #define sfc_ef10_rx_err(dpq, ...) \
diff --git a/drivers/net/sfc/sfc_ef10_rx_ev.h b/drivers/net/sfc/sfc_ef10_rx_ev.h
index 774a789..9054fb9 100644
--- a/drivers/net/sfc/sfc_ef10_rx_ev.h
+++ b/drivers/net/sfc/sfc_ef10_rx_ev.h
@@ -37,6 +37,7 @@ sfc_ef10_rx_ev_to_offloads(const efx_qword_t rx_ev, struct rte_mbuf *m,
 	if (unlikely(EFX_TEST_QWORD_BIT(rx_ev, ESF_DZ_RX_PARSE_INCOMPLETE_LBN)))
 		goto done;
 
+#if SFC_EF10_RX_EV_ENCAP_SUPPORT
 	switch (EFX_QWORD_FIELD(rx_ev, ESF_EZ_RX_ENCAP_HDR)) {
 	default:
 		/* Unexpected encapsulation tag class */
@@ -58,6 +59,7 @@ sfc_ef10_rx_ev_to_offloads(const efx_qword_t rx_ev, struct rte_mbuf *m,
 		tun_ptype = RTE_PTYPE_TUNNEL_NVGRE;
 		break;
 	}
+#endif
 
 	if (tun_ptype == 0) {
 		ip_csum_err_bit = ESF_DZ_RX_IPCKSUM_ERR_LBN;
-- 
2.7.4