[PATCH] net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum

[PATCH] net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum

[Benjamin Herrenschmidt]

We are calling the checksum helper after the dma_map_single()
call to map the packet. This is incorrect as the checksumming
code will touch the packet from the CPU. This means the cache
won't be properly flushes (or the bounce buffering will leave
us with the unmodified packet to DMA).

This moves the calculation of the checksum & vlan tags to
before the DMA mapping.

This also has the side effect of fixing another bug: If the
checksum helper fails, we goto "drop" to drop the packet, which
will not unmap the DMA mapping.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Fixes: 05690d633f30 ftgmac100: Upgrade to NETIF_F_HW_CSUM
CC: stable@vger.kernel.org [v4.12+]
---
 drivers/net/ethernet/faraday/ftgmac100.c | 25 ++++++++++++------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 9b7af94a40bb..96e9565f1e08 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -727,6 +727,18 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
 	 */
 	nfrags = skb_shinfo(skb)->nr_frags;
 
+	/* Setup HW checksumming */
+	csum_vlan = 0;
+	if (skb->ip_summed == CHECKSUM_PARTIAL &&
+	    !ftgmac100_prep_tx_csum(skb, &csum_vlan))
+		goto drop;
+
+	/* Add VLAN tag */
+	if (skb_vlan_tag_present(skb)) {
+		csum_vlan |= FTGMAC100_TXDES1_INS_VLANTAG;
+		csum_vlan |= skb_vlan_tag_get(skb) & 0xffff;
+	}
+
 	/* Get header len */
 	len = skb_headlen(skb);
 
@@ -753,19 +765,6 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
 	if (nfrags == 0)
 		f_ctl_stat |= FTGMAC100_TXDES0_LTS;
 	txdes->txdes3 = cpu_to_le32(map);
-
-	/* Setup HW checksumming */
-	csum_vlan = 0;
-	if (skb->ip_summed == CHECKSUM_PARTIAL &&
-	    !ftgmac100_prep_tx_csum(skb, &csum_vlan))
-		goto drop;
-
-	/* Add VLAN tag */
-	if (skb_vlan_tag_present(skb)) {
-		csum_vlan |= FTGMAC100_TXDES1_INS_VLANTAG;
-		csum_vlan |= skb_vlan_tag_get(skb) & 0xffff;
-	}
-
 	txdes->txdes1 = cpu_to_le32(csum_vlan);
 
 	/* Next descriptor */

Re: [PATCH] net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum

[Vijay Khemka]

Looks good to me. And I have tested it. It works perfectly fine.

Reviewed-by: Vijay Khemka <vijaykhemka@fb.com>
Tested-by: Vijay Khemka <vijaykhemka@fb.com>

On 10/24/19, 7:47 PM, "Benjamin Herrenschmidt" <benh@kernel.crashing.org> wrote:

    We are calling the checksum helper after the dma_map_single()
    call to map the packet. This is incorrect as the checksumming
    code will touch the packet from the CPU. This means the cache
    won't be properly flushes (or the bounce buffering will leave
    us with the unmodified packet to DMA).
    
    This moves the calculation of the checksum & vlan tags to
    before the DMA mapping.
    
    This also has the side effect of fixing another bug: If the
    checksum helper fails, we goto "drop" to drop the packet, which
    will not unmap the DMA mapping.
    
    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Fixes: 05690d633f30 ftgmac100: Upgrade to NETIF_F_HW_CSUM
    CC: stable@vger.kernel.org [v4.12+]
    ---
     drivers/net/ethernet/faraday/ftgmac100.c | 25 ++++++++++++------------
     1 file changed, 12 insertions(+), 13 deletions(-)
    
    diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
    index 9b7af94a40bb..96e9565f1e08 100644
    --- a/drivers/net/ethernet/faraday/ftgmac100.c
    +++ b/drivers/net/ethernet/faraday/ftgmac100.c
    @@ -727,6 +727,18 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
     	 */
     	nfrags = skb_shinfo(skb)->nr_frags;
     
    +	/* Setup HW checksumming */
    +	csum_vlan = 0;
    +	if (skb->ip_summed == CHECKSUM_PARTIAL &&
    +	    !ftgmac100_prep_tx_csum(skb, &csum_vlan))
    +		goto drop;
    +
    +	/* Add VLAN tag */
    +	if (skb_vlan_tag_present(skb)) {
    +		csum_vlan |= FTGMAC100_TXDES1_INS_VLANTAG;
    +		csum_vlan |= skb_vlan_tag_get(skb) & 0xffff;
    +	}
    +
     	/* Get header len */
     	len = skb_headlen(skb);
     
    @@ -753,19 +765,6 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
     	if (nfrags == 0)
     		f_ctl_stat |= FTGMAC100_TXDES0_LTS;
     	txdes->txdes3 = cpu_to_le32(map);
    -
    -	/* Setup HW checksumming */
    -	csum_vlan = 0;
    -	if (skb->ip_summed == CHECKSUM_PARTIAL &&
    -	    !ftgmac100_prep_tx_csum(skb, &csum_vlan))
    -		goto drop;
    -
    -	/* Add VLAN tag */
    -	if (skb_vlan_tag_present(skb)) {
    -		csum_vlan |= FTGMAC100_TXDES1_INS_VLANTAG;
    -		csum_vlan |= skb_vlan_tag_get(skb) & 0xffff;
    -	}
    -
     	txdes->txdes1 = cpu_to_le32(csum_vlan);
     
     	/* Next descriptor */
    
    
    

Re: [PATCH] net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum

[David Miller]

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 25 Oct 2019 13:47:24 +1100

> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Fixes: 05690d633f30 ftgmac100: Upgrade to NETIF_F_HW_CSUM

Please put the commit header string inside double quotes and parenthesis
(" ")

> CC: stable@vger.kernel.org [v4.12+]

Do not CC: stable for networking submissions as per the netdev FAQ.

All fixed up, and queued up for -stable, thanks Ben.

Re: [PATCH] net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum

[Benjamin Herrenschmidt]

On Mon, 2019-10-28 at 16:24 -0700, David Miller wrote:
> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Date: Fri, 25 Oct 2019 13:47:24 +1100
> 
> > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> > Fixes: 05690d633f30 ftgmac100: Upgrade to NETIF_F_HW_CSUM
> 
> Please put the commit header string inside double quotes and
> parenthesis
> (" ")

Will do next time, I had just copy/pasted the git shortlog :-)

> > CC: stable@vger.kernel.org [v4.12+]
> 
> Do not CC: stable for networking submissions as per the netdev FAQ.

Ah oops, learned.

> All fixed up, and queued up for -stable, thanks Ben.

Thanks.

Cheers,
Ben.