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Subject[PATCH 4.9 38/62] net: stmmac: fix dropping of multi-descriptor RX frames
Date
[ Upstream commit 8ac0c24fe1c256af6644caf3d311029440ec2fbd ]

Packets without the last descriptor set should be dropped early. If we
receive a frame larger than the DMA buffer, the HW will continue using the
next descriptor. Driver mistakes these as individual frames, and sometimes
a truncated frame (without the LD set) may look like a valid packet.

This fixes a strange issue where the system replies to 4098-byte ping
although the MTU/DMA buffer size is set to 4096, and yet at the same
time it's logging an oversized packet.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/stmicro/stmmac/enh_desc.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 2c40cafa2619..77dc5842bd0b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -205,6 +205,11 @@ static int enh_desc_get_rx_status(void *data, struct stmmac_extra_stats *x,
if (unlikely(rdes0 & RDES0_OWN))
return dma_own;

+ if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
+ stats->rx_length_errors++;
+ return discard_frame;
+ }
+
if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR)) {
x->rx_desc++;
--
2.20.1


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