[dpdk-dev] [PATCH v5 03/17] net/i40e: add checks for max SIMD bitwidth

Ciara Power ciara.power at intel.com
Tue Oct 13 13:04:23 CEST 2020


When choosing a vector path to take, an extra condition must be
satisfied to ensure the max SIMD bitwidth allows for the CPU enabled
path.

Cc: Beilei Xing <beilei.xing at intel.com>
Cc: Jeff Guo <jia.guo at intel.com>

Signed-off-by: Ciara Power <ciara.power at intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>

---
v4: Updated enum names.
---
 drivers/net/i40e/i40e_rxtx.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 322fc1ed75..a6644b3efa 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -3098,7 +3098,8 @@ static eth_rx_burst_t
 i40e_get_latest_rx_vec(bool scatter)
 {
 #if defined(RTE_ARCH_X86) && defined(CC_AVX2_SUPPORT)
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2))
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) &&
+			rte_get_max_simd_bitwidth() >= RTE_SIMD_256)
 		return scatter ? i40e_recv_scattered_pkts_vec_avx2 :
 				 i40e_recv_pkts_vec_avx2;
 #endif
@@ -3115,7 +3116,8 @@ i40e_get_recommend_rx_vec(bool scatter)
 	 * use of AVX2 version to later plaforms, not all those that could
 	 * theoretically run it.
 	 */
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F))
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) &&
+			rte_get_max_simd_bitwidth() >= RTE_SIMD_256)
 		return scatter ? i40e_recv_scattered_pkts_vec_avx2 :
 				 i40e_recv_pkts_vec_avx2;
 #endif
@@ -3154,7 +3156,8 @@ i40e_set_rx_function(struct rte_eth_dev *dev)
 		}
 	}
 
-	if (ad->rx_vec_allowed) {
+	if (ad->rx_vec_allowed  && rte_get_max_simd_bitwidth()
+			>= RTE_SIMD_128) {
 		/* Vec Rx path */
 		PMD_INIT_LOG(DEBUG, "Vector Rx path will be used on port=%d.",
 				dev->data->port_id);
@@ -3268,7 +3271,8 @@ static eth_tx_burst_t
 i40e_get_latest_tx_vec(void)
 {
 #if defined(RTE_ARCH_X86) && defined(CC_AVX2_SUPPORT)
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2))
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) &&
+			rte_get_max_simd_bitwidth() >= RTE_SIMD_256)
 		return i40e_xmit_pkts_vec_avx2;
 #endif
 	return i40e_xmit_pkts_vec;
@@ -3283,7 +3287,8 @@ i40e_get_recommend_tx_vec(void)
 	 * use of AVX2 version to later plaforms, not all those that could
 	 * theoretically run it.
 	 */
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F))
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) &&
+			rte_get_max_simd_bitwidth() >= RTE_SIMD_256)
 		return i40e_xmit_pkts_vec_avx2;
 #endif
 	return i40e_xmit_pkts_vec;
@@ -3311,7 +3316,8 @@ i40e_set_tx_function(struct rte_eth_dev *dev)
 	}
 
 	if (ad->tx_simple_allowed) {
-		if (ad->tx_vec_allowed) {
+		if (ad->tx_vec_allowed &&
+				rte_get_max_simd_bitwidth() >= RTE_SIMD_128) {
 			PMD_INIT_LOG(DEBUG, "Vector tx finally be used.");
 			if (ad->use_latest_vec)
 				dev->tx_pkt_burst =
-- 
2.22.0



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