[dpdk-dev] [PATCH] net/fm10k: fix secondary process crash

[Xiao Wang <xiao.w.wang@intel.com>]

If the primary process has initialized all the queues to vector
pmd mode, the secondary process should not use scalar code path,
because the per queue data structures haven't been prepared for
that, e.g. txq->ops is for vector Tx rather than scalar Tx.

Fixes: a6ce64a97520 ("fm10k: introduce vector driver")
Cc: stable@dpdk.org

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
---
 drivers/net/fm10k/fm10k_ethdev.c | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index 388f929..680d617 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -2750,6 +2750,21 @@ static void __attribute__((cold))
 	int use_sse = 1;
 	uint16_t tx_ftag_en = 0;
 
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		/* primary process has set the ftag flag and txq_flags */
+		txq = dev->data->tx_queues[0];
+		if (fm10k_tx_vec_condition_check(txq)) {
+			dev->tx_pkt_burst = fm10k_xmit_pkts;
+			dev->tx_pkt_prepare = fm10k_prep_pkts;
+			PMD_INIT_LOG(DEBUG, "Use regular Tx func");
+		} else {
+			PMD_INIT_LOG(DEBUG, "Use vector Tx func");
+			dev->tx_pkt_burst = fm10k_xmit_pkts_vec;
+			dev->tx_pkt_prepare = NULL;
+		}
+		return;
+	}
+
 	if (fm10k_check_ftag(dev->device->devargs))
 		tx_ftag_en = 1;
 
@@ -2810,6 +2825,9 @@ static void __attribute__((cold))
 	else
 		PMD_INIT_LOG(DEBUG, "Use regular Rx func");
 
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return;
+
 	for (i = 0; i < dev->data->nb_rx_queues; i++) {
 		struct fm10k_rx_queue *rxq = dev->data->rx_queues[i];
 
@@ -2856,9 +2874,15 @@ static void __attribute__((cold))
 	dev->tx_pkt_burst = &fm10k_xmit_pkts;
 	dev->tx_pkt_prepare = &fm10k_prep_pkts;
 
-	/* only initialize in the primary process */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+	/*
+	 * Primary process does the whole initialization, for secondary
+	 * processes, we just select the same Rx and Tx function as primary.
+	 */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		fm10k_set_rx_function(dev);
+		fm10k_set_tx_function(dev);
 		return 0;
+	}
 
 	rte_eth_copy_pci_info(dev, pdev);
 	dev->data->dev_flags |= RTE_ETH_DEV_DETACHABLE;
-- 
1.8.3.1