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Date: Fri, 25 Nov 2016 10:11:20 +0100 From: Nicolas Ferre <nicolas.ferre@...el.com> To: Cyrille Pitchen <cyrille.pitchen@...el.com>, <davem@...emloft.net>, <netdev@...r.kernel.org>, <soren.brinkmann@...inx.com> CC: <Andrei.Pistirica@...rochip.com>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/1] net: macb: fix the RX queue reset in macb_rx() Le 25/11/2016 à 09:49, Cyrille Pitchen a écrit : > 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 <cyrille.pitchen@...el.com> > Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors") Acked-by: Nicolas Ferre <nicolas.ferre@...el.com> Thanks. Regards, > --- > drivers/net/ethernet/cadence/macb.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c > index 0e489bb82456..8ee303b8da08 100644 > --- a/drivers/net/ethernet/cadence/macb.c > +++ b/drivers/net/ethernet/cadence/macb.c > @@ -991,6 +991,7 @@ static inline void macb_init_rx_ring(struct macb *bp) > addr += bp->rx_buffer_size; > } > bp->rx_ring[bp->rx_ring_size - 1].addr |= MACB_BIT(RX_WRAP); > + bp->rx_tail = 0; > } > > static int macb_rx(struct macb *bp, int budget) > @@ -1736,8 +1737,6 @@ 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[bp->tx_ring_size - 1].ctrl |= MACB_BIT(TX_WRAP); > - > - bp->rx_tail = 0; > } > > static void macb_reset_hw(struct macb *bp) > -- Nicolas Ferre
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