[PATCH net] net: bcmgenet: skip invalid partial checksums

[PATCH net] net: bcmgenet: skip invalid partial checksums

[Doug Berger]

The RXCHK block will return a partial checksum of 0 if it encounters
a problem while receiving a packet. Since a 1's complement sum can
only produce this result if no bits are set in the received data
stream it is fair to treat it as an invalid partial checksum and
not pass it up the stack.

Fixes: 810155397890 ("net: bcmgenet: use CHECKSUM_COMPLETE for NETIF_F_RXCSUM")
Signed-off-by: Doug Berger <opendmb@gmail.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 87f1056e29ff..2da804f84b48 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2287,8 +2287,10 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
 		dma_length_status = status->length_status;
 		if (dev->features & NETIF_F_RXCSUM) {
 			rx_csum = (__force __be16)(status->rx_csum & 0xffff);
-			skb->csum = (__force __wsum)ntohs(rx_csum);
-			skb->ip_summed = CHECKSUM_COMPLETE;
+			if (rx_csum) {
+				skb->csum = (__force __wsum)ntohs(rx_csum);
+				skb->ip_summed = CHECKSUM_COMPLETE;
+			}
 		}
 
 		/* DMA flags and length are still valid no matter how
-- 
2.25.1

Re: [PATCH net] net: bcmgenet: skip invalid partial checksums

[Florian Fainelli]

On 3/16/2022 6:28 PM, Doug Berger wrote:
> The RXCHK block will return a partial checksum of 0 if it encounters
> a problem while receiving a packet. Since a 1's complement sum can
> only produce this result if no bits are set in the received data
> stream it is fair to treat it as an invalid partial checksum and
> not pass it up the stack.
> 
> Fixes: 810155397890 ("net: bcmgenet: use CHECKSUM_COMPLETE for NETIF_F_RXCSUM")
> Signed-off-by: Doug Berger <opendmb@gmail.com>

Acked-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH net] net: bcmgenet: skip invalid partial checksums

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 16 Mar 2022 18:28:12 -0700 you wrote:
> The RXCHK block will return a partial checksum of 0 if it encounters
> a problem while receiving a packet. Since a 1's complement sum can
> only produce this result if no bits are set in the received data
> stream it is fair to treat it as an invalid partial checksum and
> not pass it up the stack.
> 
> Fixes: 810155397890 ("net: bcmgenet: use CHECKSUM_COMPLETE for NETIF_F_RXCSUM")
> Signed-off-by: Doug Berger <opendmb@gmail.com>
> 
> [...]

Here is the summary with links:
  - [net] net: bcmgenet: skip invalid partial checksums
    https://git.kernel.org/netdev/net/c/0f643c88c8d2

You are awesome, thank you!
-- 
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