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[realtek] Reset NIC when closing interface if using legacy mode

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The legacy transmit descriptor index is not reset by anything short of
a full device reset.  This can cause the legacy transmit ring to stall
after closing and reopening the device, since the hardware and
software indices will be out of sync.

Fix by performing a reset after closing the interface.  Do this only
if operating in legacy mode, since in C+ mode the reset is not
required and would undesirably clear additional state (such as the C+
command register itself).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-11-04 14:24:52 +00:00
parent 9b25f6e5cf
commit f560e7b70b
1 changed files with 4 additions and 0 deletions
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4
src/drivers/net/realtek.c
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@@ -768,6 +768,10 @@ static void realtek_close ( struct net_device *netdev ) {
/* Destroy transmit descriptor ring */
realtek_destroy_ring ( rtl, &rtl->tx );
/* Reset legacy transmit descriptor index, if applicable */
if ( rtl->legacy )
realtek_reset ( rtl );
}
/**