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net: macb: Fix race condition in driver when Rx frame is dropped 

Under heavy Rx load, observed that the Hw is updating the USED bit
and it is not updating the received frame status to the BD control
field. This could be lack of resources for processing the BDs at high
data rates. Driver drops the frame associated with this BD but not
clearing the USED bit. So, this is causing hang condition as Hw
expects USED bit to be cleared for this BD.

Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Punnaiah Choudary Kalluri 2015-04-29 08:34:46 +05:30 committed by David S. Miller
parent b56fc3c536
commit d4c216c541
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/cadence/macb.c
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@ -707,6 +707,9 @@ static void gem_rx_refill(struct macb *bp)
/* properly align Ethernet header */
skb_reserve(skb, NET_IP_ALIGN);
} else {
bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED);
bp->rx_ring[entry].ctrl = 0;
}
}