[dpdk-dev] [PATCH v3 04/18] net/i40e: add checks for max SIMD bitwidth

[Ciara Power]

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.x...@intel.com>
Cc: Jeff Guo <jia....@intel.com>

Signed-off-by: Ciara Power <ciara.po...@intel.com>
---
 drivers/net/i40e/i40e_rxtx.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 60b33d20a1..9b535b52fa 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_MAX_256_SIMD)
                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_MAX_256_SIMD)
                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_MAX_128_SIMD) {
                /* 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_MAX_256_SIMD)
                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_MAX_256_SIMD)
                return i40e_xmit_pkts_vec_avx2;
 #endif
        return i40e_xmit_pkts_vec;
@@ -3311,7 +3316,9 @@ 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_MAX_128_SIMD) {
                        PMD_INIT_LOG(DEBUG, "Vector tx finally be used.");
                        if (ad->use_latest_vec)
                                dev->tx_pkt_burst =
-- 
2.17.1