[dpdk-dev] [PATCH v2 1/3] i40e: require SSE4.1 support for vector driver

[Bruce Richardson <bruce.richardson@intel.com>]

Later commits to improve the driver will make use of the SSE4.1
_mm_blend_epi16 intrinsic, so:
* set the compilation level to always have SSE4.1 support,
* and add in a runtime check for SSE4.1 as part of the condition checks
  for vector driver selection.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/net/i40e/Makefile        | 6 ++++++
 drivers/net/i40e/i40e_rxtx_vec.c | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/net/i40e/Makefile b/drivers/net/i40e/Makefile
index 6dd6eaa..56b20d5 100644
--- a/drivers/net/i40e/Makefile
+++ b/drivers/net/i40e/Makefile
@@ -102,6 +102,12 @@ SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_ethdev_vf.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_pf.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_fdir.c
 
+# vector PMD driver needs SSE4.1 support
+ifeq ($(findstring RTE_MACHINE_CPUFLAG_SSE4_1,$(CFLAGS)),)
+CFLAGS_i40e_rxtx_vec.o += -msse4.1
+endif
+
+
 # this lib depends upon:
 DEPDIRS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += lib/librte_eal lib/librte_ether
 DEPDIRS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += lib/librte_mempool lib/librte_mbuf
diff --git a/drivers/net/i40e/i40e_rxtx_vec.c b/drivers/net/i40e/i40e_rxtx_vec.c
index 047aff5..1e2fadd 100644
--- a/drivers/net/i40e/i40e_rxtx_vec.c
+++ b/drivers/net/i40e/i40e_rxtx_vec.c
@@ -751,6 +751,10 @@ i40e_rx_vec_dev_conf_condition_check(struct rte_eth_dev *dev)
 	struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
 	struct rte_fdir_conf *fconf = &dev->data->dev_conf.fdir_conf;
 
+	/* need SSE4.1 support */
+	if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE4_1))
+		return -1;
+
 #ifndef RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE
 	/* whithout rx ol_flags, no VP flag report */
 	if (rxmode->hw_vlan_strip != 0 ||
-- 
2.5.5