[net,v2,1/1] net: macb: fix the RX queue reset in macb_rx()

Commit Message

Cyrille Pitchen Nov. 28, 2016, 1:40 p.m. UTC

On macb only (not gem), when a RX queue corruption was detected from
macb_rx(), the RX queue was reset: during this process the RX ring
buffer descriptor was initialized by macb_init_rx_ring() but we forgot
to also set bp->rx_tail to 0.

Indeed, when processing the received frames, bp->rx_tail provides the
macb driver with the index in the RX ring buffer of the next buffer to
process. So when the whole ring buffer is reset we must also reset
bp->rx_tail so the driver is synchronized again with the hardware.

Since macb_init_rx_ring() is called from many locations, currently from
macb_rx() and macb_init_rings(), we'd rather add the "bp->rx_tail = 0;"
line inside macb_init_rx_ring() than add the very same line after each
call of this function.

Without this fix, the rx queue is not reset properly to recover from
queue corruption and connection drop may occur.

Signed-off-by: Cyrille Pitchen <[e-mail]>
Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors")
Acked-by: Nicolas Ferre <[e-mail]>
---

ChangeLog:

v1 -> v2:
- rebase on net/master (v1 was based on net-next/master)
- add "Acked-by:" tag from Nicolas Ferre.

 drivers/net/ethernet/cadence/macb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Comments

David Miller Nov. 30, 2016, 1:02 a.m. UTC | #1

From: Cyrille Pitchen <[e-mail]>
Date: Mon, 28 Nov 2016 14:40:55 +0100

> On macb only (not gem), when a RX queue corruption was detected from
> macb_rx(), the RX queue was reset: during this process the RX ring
> buffer descriptor was initialized by macb_init_rx_ring() but we forgot
> to also set bp->rx_tail to 0.
> 
> Indeed, when processing the received frames, bp->rx_tail provides the
> macb driver with the index in the RX ring buffer of the next buffer to
> process. So when the whole ring buffer is reset we must also reset
> bp->rx_tail so the driver is synchronized again with the hardware.
> 
> Since macb_init_rx_ring() is called from many locations, currently from
> macb_rx() and macb_init_rings(), we'd rather add the "bp->rx_tail = 0;"
> line inside macb_init_rx_ring() than add the very same line after each
> call of this function.
> 
> Without this fix, the rx queue is not reset properly to recover from
> queue corruption and connection drop may occur.
> 
> Signed-off-by: Cyrille Pitchen <[e-mail]>
> Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors")
> Acked-by: Nicolas Ferre <[e-mail]>

Applied and queued up for -stable, thanks.

Patch

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 533653bd7aec..3ede59c9cae0 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -975,6 +975,7 @@  static inline void macb_init_rx_ring(struct macb *bp)
 		addr += bp->rx_buffer_size;
 	}
 	bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
+	bp->rx_tail = 0;
 }
 
 static int macb_rx(struct macb *bp, int budget)
@@ -1616,8 +1617,6 @@  static void macb_init_rings(struct macb *bp)
 	bp->queues[0].tx_head = 0;
 	bp->queues[0].tx_tail = 0;
 	bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
-
-	bp->rx_tail = 0;
 }
 
 static void macb_reset_hw(struct macb *bp)