[dpdk-dev] [PATCH 20.11 08/12] net/iavf: 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: Jingjing Wu <jingjing...@intel.com>
Cc: Beilei Xing <beilei.x...@intel.com>

Signed-off-by: Ciara Power <ciara.po...@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 05a7dd898a..b798d082a2 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -2105,14 +2105,16 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
        int i;
        bool use_avx2 = false;
 
-       if (!iavf_rx_vec_dev_check(dev)) {
+       if (!iavf_rx_vec_dev_check(dev) &&
+                       rte_get_max_simd_bitwidth() >= RTE_MAX_128_SIMD) {
                for (i = 0; i < dev->data->nb_rx_queues; i++) {
                        rxq = dev->data->rx_queues[i];
                        (void)iavf_rxq_vec_setup(rxq);
                }
 
-               if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) == 1 ||
-                   rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1)
+               if ((rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) == 1 ||
+                   rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1) &&
+                               rte_get_max_simd_bitwidth() >= RTE_MAX_256_SIMD)
                        use_avx2 = true;
 
                if (dev->data->scattered_rx) {
@@ -2178,7 +2180,8 @@ iavf_set_tx_function(struct rte_eth_dev *dev)
        int i;
        bool use_avx2 = false;
 
-       if (!iavf_tx_vec_dev_check(dev)) {
+       if (!iavf_tx_vec_dev_check(dev) &&
+                       rte_get_max_simd_bitwidth() >= RTE_MAX_128_SIMD) {
                for (i = 0; i < dev->data->nb_tx_queues; i++) {
                        txq = dev->data->tx_queues[i];
                        if (!txq)
@@ -2186,8 +2189,9 @@ iavf_set_tx_function(struct rte_eth_dev *dev)
                        iavf_txq_vec_setup(txq);
                }
 
-               if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) == 1 ||
-                   rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1)
+               if ((rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) == 1 ||
+                   rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1) &&
+                               rte_get_max_simd_bitwidth() >= RTE_MAX_256_SIMD)
                        use_avx2 = true;
 
                PMD_DRV_LOG(DEBUG, "Using %sVector Tx (port %d).",
-- 
2.17.1