As per recent change by the following commit:

commit 066f3d9cc21c ("ethdev: remove callback checks from fast path")

framework unconditionally invokes dev->tx_pkt_prepare. Ensure
dev->tx_pkt_prepare is not NULL when vector or simple TX paths are
selected, by assigning rte_eth_tx_pkt_prepare_dummy.

This aligns with expectations with above mentioned commit.

Fixes: 9b134aa39716 ("net/fm10k: add Tx preparation")
Cc: [email protected]

Signed-off-by: Bruce Richardson <[email protected]>
---
 drivers/net/intel/fm10k/fm10k_ethdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/intel/fm10k/fm10k_ethdev.c 
b/drivers/net/intel/fm10k/fm10k_ethdev.c
index 82c0f1a1ad..97f61afec2 100644
--- a/drivers/net/intel/fm10k/fm10k_ethdev.c
+++ b/drivers/net/intel/fm10k/fm10k_ethdev.c
@@ -2955,7 +2955,7 @@ fm10k_set_tx_function(struct rte_eth_dev *dev)
                } else {
                        PMD_INIT_LOG(DEBUG, "Use vector Tx func");
                        dev->tx_pkt_burst = fm10k_xmit_pkts_vec;
-                       dev->tx_pkt_prepare = NULL;
+                       dev->tx_pkt_prepare = rte_eth_tx_pkt_prepare_dummy;
                }
                return;
        }
@@ -2979,7 +2979,7 @@ fm10k_set_tx_function(struct rte_eth_dev *dev)
                        fm10k_txq_vec_setup(txq);
                }
                dev->tx_pkt_burst = fm10k_xmit_pkts_vec;
-               dev->tx_pkt_prepare = NULL;
+               dev->tx_pkt_prepare = rte_eth_tx_pkt_prepare_dummy;
        } else {
                dev->tx_pkt_burst = fm10k_xmit_pkts;
                dev->tx_pkt_prepare = fm10k_prep_pkts;
-- 
2.48.1

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