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[PATCH v2 net 4/4] ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()

Yue Haibing posted 4 patches 1 month, 1 week ago
There is a newer version of this series
[PATCH v2 net 4/4] ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()
Posted by Yue Haibing 1 month, 1 week ago 
ixgbevf_run_xdp() converts customed xdp action to a negative error code
with the sk_buff pointer type which be checked with IS_ERR in
ixgbevf_clean_rx_irq(). Remove this error pointer handing instead use
plain int return value.

Fixes: c7aec59657b6 ("ixgbevf: Add XDP support for pass and drop actions")
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
---
 .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 ++++++++-----------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 149911e3002a..183d2305d058 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -732,10 +732,6 @@ static bool ixgbevf_cleanup_headers(struct ixgbevf_ring *rx_ring,
 				    union ixgbe_adv_rx_desc *rx_desc,
 				    struct sk_buff *skb)
 {
-	/* XDP packets use error pointer so abort at this point */
-	if (IS_ERR(skb))
-		return true;
-
 	/* verify that the packet does not have any known errors */
 	if (unlikely(ixgbevf_test_staterr(rx_desc,
 					  IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
@@ -1044,9 +1040,9 @@ static int ixgbevf_xmit_xdp_ring(struct ixgbevf_ring *ring,
 	return IXGBEVF_XDP_TX;
 }
 
-static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
-				       struct ixgbevf_ring  *rx_ring,
-				       struct xdp_buff *xdp)
+static int ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
+			   struct ixgbevf_ring *rx_ring,
+			   struct xdp_buff *xdp)
 {
 	int result = IXGBEVF_XDP_PASS;
 	struct ixgbevf_ring *xdp_ring;
@@ -1080,7 +1076,7 @@ static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
 		break;
 	}
 xdp_out:
-	return ERR_PTR(-result);
+	return result;
 }
 
 static unsigned int ixgbevf_rx_frame_truesize(struct ixgbevf_ring *rx_ring,
@@ -1122,6 +1118,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
 	struct sk_buff *skb = rx_ring->skb;
 	bool xdp_xmit = false;
 	struct xdp_buff xdp;
+	int xdp_res;
 
 	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
 #if (PAGE_SIZE < 8192)
@@ -1165,11 +1162,11 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
 			/* At larger PAGE_SIZE, frame_sz depend on len size */
 			xdp.frame_sz = ixgbevf_rx_frame_truesize(rx_ring, size);
 #endif
-			skb = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
+			xdp_res = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
 		}
 
-		if (IS_ERR(skb)) {
-			if (PTR_ERR(skb) == -IXGBEVF_XDP_TX) {
+		if (xdp_res) {
+			if (xdp_res == IXGBEVF_XDP_TX) {
 				xdp_xmit = true;
 				ixgbevf_rx_buffer_flip(rx_ring, rx_buffer,
 						       size);
@@ -1189,7 +1186,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
 		}
 
 		/* exit if we failed to retrieve a buffer */
-		if (!skb) {
+		if (!xdp_res && !skb) {
 			rx_ring->rx_stats.alloc_rx_buff_failed++;
 			rx_buffer->pagecnt_bias++;
 			break;
@@ -1203,7 +1200,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
 			continue;
 
 		/* verify the packet layout is correct */
-		if (ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
+		if (xdp_res || ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
 			skb = NULL;
 			continue;
 		}
-- 
2.34.1
Re: [PATCH v2 net 4/4] ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()
Posted by Maciej Fijalkowski 1 month, 1 week ago 
On Fri, Oct 18, 2024 at 10:37:34AM +0800, Yue Haibing wrote:
> ixgbevf_run_xdp() converts customed xdp action to a negative error code
> with the sk_buff pointer type which be checked with IS_ERR in
> ixgbevf_clean_rx_irq(). Remove this error pointer handing instead use
> plain int return value.
> 
> Fixes: c7aec59657b6 ("ixgbevf: Add XDP support for pass and drop actions")
> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
> ---
>  .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 ++++++++-----------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> index 149911e3002a..183d2305d058 100644
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -732,10 +732,6 @@ static bool ixgbevf_cleanup_headers(struct ixgbevf_ring *rx_ring,
>  				    union ixgbe_adv_rx_desc *rx_desc,
>  				    struct sk_buff *skb)
>  {
> -	/* XDP packets use error pointer so abort at this point */
> -	if (IS_ERR(skb))
> -		return true;
> -
>  	/* verify that the packet does not have any known errors */
>  	if (unlikely(ixgbevf_test_staterr(rx_desc,
>  					  IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
> @@ -1044,9 +1040,9 @@ static int ixgbevf_xmit_xdp_ring(struct ixgbevf_ring *ring,
>  	return IXGBEVF_XDP_TX;
>  }
>  
> -static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
> -				       struct ixgbevf_ring  *rx_ring,
> -				       struct xdp_buff *xdp)
> +static int ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
> +			   struct ixgbevf_ring *rx_ring,
> +			   struct xdp_buff *xdp)

ditto

>  {
>  	int result = IXGBEVF_XDP_PASS;
>  	struct ixgbevf_ring *xdp_ring;
> @@ -1080,7 +1076,7 @@ static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
>  		break;
>  	}
>  xdp_out:
> -	return ERR_PTR(-result);
> +	return result;
>  }
>  
>  static unsigned int ixgbevf_rx_frame_truesize(struct ixgbevf_ring *rx_ring,
> @@ -1122,6 +1118,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>  	struct sk_buff *skb = rx_ring->skb;
>  	bool xdp_xmit = false;
>  	struct xdp_buff xdp;
> +	int xdp_res;
>  
>  	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
>  #if (PAGE_SIZE < 8192)
> @@ -1165,11 +1162,11 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>  			/* At larger PAGE_SIZE, frame_sz depend on len size */
>  			xdp.frame_sz = ixgbevf_rx_frame_truesize(rx_ring, size);
>  #endif
> -			skb = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
> +			xdp_res = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
>  		}
>  
> -		if (IS_ERR(skb)) {
> -			if (PTR_ERR(skb) == -IXGBEVF_XDP_TX) {
> +		if (xdp_res) {
> +			if (xdp_res == IXGBEVF_XDP_TX) {
>  				xdp_xmit = true;
>  				ixgbevf_rx_buffer_flip(rx_ring, rx_buffer,
>  						       size);
> @@ -1189,7 +1186,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>  		}
>  
>  		/* exit if we failed to retrieve a buffer */
> -		if (!skb) {
> +		if (!xdp_res && !skb) {
>  			rx_ring->rx_stats.alloc_rx_buff_failed++;
>  			rx_buffer->pagecnt_bias++;
>  			break;
> @@ -1203,7 +1200,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>  			continue;
>  
>  		/* verify the packet layout is correct */
> -		if (ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
> +		if (xdp_res || ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
>  			skb = NULL;
>  			continue;
>  		}
> -- 
> 2.34.1
>
Re: [PATCH v2 net 4/4] ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()
Posted by Yue Haibing 1 month, 1 week ago 
On 2024/10/18 20:23, Maciej Fijalkowski wrote:
> On Fri, Oct 18, 2024 at 10:37:34AM +0800, Yue Haibing wrote:
>> ixgbevf_run_xdp() converts customed xdp action to a negative error code
>> with the sk_buff pointer type which be checked with IS_ERR in
>> ixgbevf_clean_rx_irq(). Remove this error pointer handing instead use
>> plain int return value.
>>
>> Fixes: c7aec59657b6 ("ixgbevf: Add XDP support for pass and drop actions")
>> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
>> ---
>>  .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 ++++++++-----------
>>  1 file changed, 10 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
>> index 149911e3002a..183d2305d058 100644
>> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
>> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
>> @@ -732,10 +732,6 @@ static bool ixgbevf_cleanup_headers(struct ixgbevf_ring *rx_ring,
>>  				    union ixgbe_adv_rx_desc *rx_desc,
>>  				    struct sk_buff *skb)
>>  {
>> -	/* XDP packets use error pointer so abort at this point */
>> -	if (IS_ERR(skb))
>> -		return true;
>> -
>>  	/* verify that the packet does not have any known errors */
>>  	if (unlikely(ixgbevf_test_staterr(rx_desc,
>>  					  IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
>> @@ -1044,9 +1040,9 @@ static int ixgbevf_xmit_xdp_ring(struct ixgbevf_ring *ring,
>>  	return IXGBEVF_XDP_TX;
>>  }
>>  
>> -static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
>> -				       struct ixgbevf_ring  *rx_ring,
>> -				       struct xdp_buff *xdp)
>> +static int ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
>> +			   struct ixgbevf_ring *rx_ring,
>> +			   struct xdp_buff *xdp)
> 
> ditto

yuehaibing@localhost:~/code/net$ ./scripts/checkpatch.pl 0004-ixgbevf-Fix-passing-0-to-ERR_PTR-in-ixgbevf_run_xdp.patch
total: 0 errors, 0 warnings, 0 checks, 67 lines checked

0004-ixgbevf-Fix-passing-0-to-ERR_PTR-in-ixgbevf_run_xdp.patch has no obvious style problems and is ready for submission.

> 
>>  {
>>  	int result = IXGBEVF_XDP_PASS;
>>  	struct ixgbevf_ring *xdp_ring;
>> @@ -1080,7 +1076,7 @@ static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
>>  		break;
>>  	}
>>  xdp_out:
>> -	return ERR_PTR(-result);
>> +	return result;
>>  }
>>  
>>  static unsigned int ixgbevf_rx_frame_truesize(struct ixgbevf_ring *rx_ring,
>> @@ -1122,6 +1118,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>>  	struct sk_buff *skb = rx_ring->skb;
>>  	bool xdp_xmit = false;
>>  	struct xdp_buff xdp;
>> +	int xdp_res;
>>  
>>  	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
>>  #if (PAGE_SIZE < 8192)
>> @@ -1165,11 +1162,11 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>>  			/* At larger PAGE_SIZE, frame_sz depend on len size */
>>  			xdp.frame_sz = ixgbevf_rx_frame_truesize(rx_ring, size);
>>  #endif
>> -			skb = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
>> +			xdp_res = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
>>  		}
>>  
>> -		if (IS_ERR(skb)) {
>> -			if (PTR_ERR(skb) == -IXGBEVF_XDP_TX) {
>> +		if (xdp_res) {
>> +			if (xdp_res == IXGBEVF_XDP_TX) {
>>  				xdp_xmit = true;
>>  				ixgbevf_rx_buffer_flip(rx_ring, rx_buffer,
>>  						       size);
>> @@ -1189,7 +1186,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>>  		}
>>  
>>  		/* exit if we failed to retrieve a buffer */
>> -		if (!skb) {
>> +		if (!xdp_res && !skb) {
>>  			rx_ring->rx_stats.alloc_rx_buff_failed++;
>>  			rx_buffer->pagecnt_bias++;
>>  			break;
>> @@ -1203,7 +1200,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
>>  			continue;
>>  
>>  		/* verify the packet layout is correct */
>> -		if (ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
>> +		if (xdp_res || ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
>>  			skb = NULL;
>>  			continue;
>>  		}
>> -- 
>> 2.34.1
>>
> 
> .

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