D60216.diff
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	diff --git a/sys/dev/iavf/if_iavf_iflib.c b/sys/dev/iavf/if_iavf_iflib.c
	--- a/sys/dev/iavf/if_iavf_iflib.c
	+++ b/sys/dev/iavf/if_iavf_iflib.c
	@@ -2225,14 +2225,19 @@
	void
	iavf_init_tx_cidx(struct iavf_vsi *vsi)
	{
	- if_softc_ctx_t scctx = vsi->shared;
	struct iavf_tx_queue *tx_que;
	int i;

	for (i = 0, tx_que = vsi->tx_queues; i < vsi->num_tx_queues; i++, tx_que++) {
	struct tx_ring *txr = &tx_que->txr;

	- txr->tx_cidx_processed = scctx->isc_ntxd[0] - 1;
	+ /*
	+ * In head writeback mode the hardware reports the index of
	+ * the next descriptor it will process. Start from 0, so
	+ * that the first credits update does not count a descriptor
	+ * that was never processed.
	+ */
	+ txr->tx_cidx_processed = 0;
	}
	}