D30728.diff
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	diff --git a/sys/net/iflib.h b/sys/net/iflib.h
	--- a/sys/net/iflib.h
	+++ b/sys/net/iflib.h
	@@ -402,6 +402,10 @@
	* Interface has an admin completion queue
	*/
	#define IFLIB_HAS_ADMINCQ 0x100000
	+/*
	+ * Interface needs to preserve TX ring indices across restarts.
	+ */
	+#define IFLIB_PRESERVE_TX_INDICES 0x200000

	/*
	* These enum values are used in iflib_needs_restart to indicate to iflib
	diff --git a/sys/net/iflib.c b/sys/net/iflib.c
	--- a/sys/net/iflib.c
	+++ b/sys/net/iflib.c
	@@ -2604,7 +2604,12 @@
	iflib_txsd_free(ctx, txq, j);
	}
	txq->ift_processed = txq->ift_cleaned = txq->ift_cidx_processed = 0;
	- txq->ift_in_use = txq->ift_gen = txq->ift_cidx = txq->ift_pidx = txq->ift_no_desc_avail = 0;
	+ txq->ift_in_use = txq->ift_gen = txq->ift_no_desc_avail = 0;
	+ if (sctx->isc_flags & IFLIB_PRESERVE_TX_INDICES)
	+ txq->ift_cidx = txq->ift_pidx;
	+ else
	+ txq->ift_cidx = txq->ift_pidx = 0;
	+
	txq->ift_closed = txq->ift_mbuf_defrag = txq->ift_mbuf_defrag_failed = 0;
	txq->ift_no_tx_dma_setup = txq->ift_txd_encap_efbig = txq->ift_map_failed = 0;
	txq->ift_pullups = 0;