| Message ID | fd8131cbe6c0546b2b8ee35bcaac5e7eb1a1647f.1480063339.git.cyrille.pitchen@atmel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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@atmel.com> > Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors") Acked-by: Nicolas Ferre <nicolas.ferre@atmel.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) >
From: Cyrille Pitchen <cyrille.pitchen@atmel.com> Date: Fri, 25 Nov 2016 09:49:32 +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 <cyrille.pitchen@atmel.com> > Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors") This doesn't apply cleanly to the 'net' tree, where RX_RING_SIZE is used instead of bp->rx_ring_size. It seems you generated this against net-next, however you didn't say that either in your Subject line nor the commit message. As a bug fix this should be targetted at 'net'.
Hi David, Le 28/11/2016 à 02:25, David Miller a écrit : > From: Cyrille Pitchen <cyrille.pitchen@atmel.com> > Date: Fri, 25 Nov 2016 09:49:32 +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 <cyrille.pitchen@atmel.com> >> Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors") > > This doesn't apply cleanly to the 'net' tree, where > RX_RING_SIZE is used instead of bp->rx_ring_size. It seems > you generated this against net-next, however you didn't say > that either in your Subject line nor the commit message. > > As a bug fix this should be targetted at 'net'. > Indeed, sorry. I've just sent a v2 based on net/master. Best regards, Cyrille
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)
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@atmel.com> Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors") --- drivers/net/ethernet/cadence/macb.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)