[PATCH v2 net 0/4] Fix passing 0 to ERR_PTR in intel ether drivers

[PATCH v2 net 0/4] Fix passing 0 to ERR_PTR in intel ether drivers

[Yue Haibing]

Fixing sparse error in xdp run code by introducing new variable xdp_res
instead of overloading this into the skb pointer as i40e drivers done
in commit 12738ac4754e ("i40e: Fix sparse errors in i40e_txrx.c") and
commit ae4393dfd472 ("i40e: fix broken XDP support").

v2: Fix this as i40e drivers done instead of return NULL in xdp run code

Yue Haibing (4):
  igc: Fix passing 0 to ERR_PTR in igc_xdp_run_prog()
  igb: Fix passing 0 to ERR_PTR in igb_run_xdp()
  ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()
  ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()

 drivers/net/ethernet/intel/igb/igb_main.c     | 22 +++++++-----------
 drivers/net/ethernet/intel/igc/igc_main.c     | 20 ++++++----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 23 ++++++++-----------
 .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 ++++++++-----------
 4 files changed, 34 insertions(+), 54 deletions(-)

-- 
2.34.1

[PATCH v2 net 1/4] igc: Fix passing 0 to ERR_PTR in igc_xdp_run_prog()

[Yue Haibing]

igc_xdp_run_prog() converts customed xdp action to a negative error code
with the sk_buff pointer type which be checked with IS_ERR in
igc_clean_rx_irq(). Remove this error pointer handing instead use plain
int return value to fix this smatch warnings:

drivers/net/ethernet/intel/igc/igc_main.c:2533
 igc_xdp_run_prog() warn: passing zero to 'ERR_PTR'

Fixes: 26575105d6ed ("igc: Add initial XDP support")
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 6e70bca15db1..5e44c2546a12 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2123,10 +2123,6 @@ static bool igc_cleanup_headers(struct igc_ring *rx_ring,
 				union igc_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;
-
 	if (unlikely(igc_test_staterr(rx_desc, IGC_RXDEXT_STATERR_RXE))) {
 		struct net_device *netdev = rx_ring->netdev;
 
@@ -2515,8 +2511,7 @@ static int __igc_xdp_run_prog(struct igc_adapter *adapter,
 	}
 }
 
-static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
-					struct xdp_buff *xdp)
+static int igc_xdp_run_prog(struct igc_adapter *adapter, struct xdp_buff *xdp)
 {
 	struct bpf_prog *prog;
 	int res;
@@ -2530,7 +2525,7 @@ static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
 	res = __igc_xdp_run_prog(adapter, prog, xdp);
 
 out:
-	return ERR_PTR(-res);
+	return res;
 }
 
 /* This function assumes __netif_tx_lock is held by the caller. */
@@ -2585,6 +2580,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
 	struct sk_buff *skb = rx_ring->skb;
 	u16 cleaned_count = igc_desc_unused(rx_ring);
 	int xdp_status = 0, rx_buffer_pgcnt;
+	int xdp_res = 0;
 
 	while (likely(total_packets < budget)) {
 		struct igc_xdp_buff ctx = { .rx_ts = NULL };
@@ -2630,12 +2626,10 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
 			xdp_buff_clear_frags_flag(&ctx.xdp);
 			ctx.rx_desc = rx_desc;
 
-			skb = igc_xdp_run_prog(adapter, &ctx.xdp);
+			xdp_res = igc_xdp_run_prog(adapter, &ctx.xdp);
 		}
 
-		if (IS_ERR(skb)) {
-			unsigned int xdp_res = -PTR_ERR(skb);
-
+		if (xdp_res) {
 			switch (xdp_res) {
 			case IGC_XDP_CONSUMED:
 				rx_buffer->pagecnt_bias++;
@@ -2657,7 +2651,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
 			skb = igc_construct_skb(rx_ring, rx_buffer, &ctx);
 
 		/* exit if we failed to retrieve a buffer */
-		if (!skb) {
+		if (!xdp_res && !skb) {
 			rx_ring->rx_stats.alloc_failed++;
 			rx_buffer->pagecnt_bias++;
 			set_bit(IGC_RING_FLAG_RX_ALLOC_FAILED, &rx_ring->flags);
@@ -2672,7 +2666,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
 			continue;
 
 		/* verify the packet layout is correct */
-		if (igc_cleanup_headers(rx_ring, rx_desc, skb)) {
+		if (xdp_res || igc_cleanup_headers(rx_ring, rx_desc, skb)) {
 			skb = NULL;
 			continue;
 		}
-- 
2.34.1

[PATCH v2 net 2/4] igb: Fix passing 0 to ERR_PTR in igb_run_xdp()

[Yue Haibing]

igb_run_xdp() converts customed xdp action to a negative error code
with the sk_buff pointer type which be checked with IS_ERR in
igb_clean_rx_irq(). Remove this error pointer handing instead use plain
int return value.

Fixes: 9cbc948b5a20 ("igb: add XDP support")
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index f1d088168723..50c23dfcf304 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -8584,9 +8584,8 @@ static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring,
 	return skb;
 }
 
-static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
-				   struct igb_ring *rx_ring,
-				   struct xdp_buff *xdp)
+static int igb_run_xdp(struct igb_adapter *adapter, struct igb_ring *rx_ring,
+		       struct xdp_buff *xdp)
 {
 	int err, result = IGB_XDP_PASS;
 	struct bpf_prog *xdp_prog;
@@ -8626,7 +8625,7 @@ static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
 		break;
 	}
 xdp_out:
-	return ERR_PTR(-result);
+	return result;
 }
 
 static unsigned int igb_rx_frame_truesize(struct igb_ring *rx_ring,
@@ -8752,10 +8751,6 @@ static bool igb_cleanup_headers(struct igb_ring *rx_ring,
 				union e1000_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;
-
 	if (unlikely((igb_test_staterr(rx_desc,
 				       E1000_RXDEXT_ERR_FRAME_ERR_MASK)))) {
 		struct net_device *netdev = rx_ring->netdev;
@@ -8879,6 +8874,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
 	struct xdp_buff xdp;
 	u32 frame_sz = 0;
 	int rx_buf_pgcnt;
+	int xdp_res = 0;
 
 	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
 #if (PAGE_SIZE < 8192)
@@ -8936,12 +8932,10 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
 			/* At larger PAGE_SIZE, frame_sz depend on len size */
 			xdp.frame_sz = igb_rx_frame_truesize(rx_ring, size);
 #endif
-			skb = igb_run_xdp(adapter, rx_ring, &xdp);
+			xdp_res = igb_run_xdp(adapter, rx_ring, &xdp);
 		}
 
-		if (IS_ERR(skb)) {
-			unsigned int xdp_res = -PTR_ERR(skb);
-
+		if (xdp_res) {
 			if (xdp_res & (IGB_XDP_TX | IGB_XDP_REDIR)) {
 				xdp_xmit |= xdp_res;
 				igb_rx_buffer_flip(rx_ring, rx_buffer, size);
@@ -8960,7 +8954,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
 						&xdp, timestamp);
 
 		/* exit if we failed to retrieve a buffer */
-		if (!skb) {
+		if (!xdp_res && !skb) {
 			rx_ring->rx_stats.alloc_failed++;
 			rx_buffer->pagecnt_bias++;
 			break;
@@ -8974,7 +8968,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
 			continue;
 
 		/* verify the packet layout is correct */
-		if (igb_cleanup_headers(rx_ring, rx_desc, skb)) {
+		if (xdp_res || igb_cleanup_headers(rx_ring, rx_desc, skb)) {
 			skb = NULL;
 			continue;
 		}
-- 
2.34.1

[PATCH v2 net 3/4] ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()

[Yue Haibing]

ixgbe_run_xdp() converts customed xdp action to a negative error code
with the sk_buff pointer type which be checked with IS_ERR in
ixgbe_clean_rx_irq(). Remove this error pointer handing instead use
plain int return value.

Fixes: 924708081629 ("ixgbe: add XDP support for pass and drop actions")
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 23 ++++++++-----------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 8b8404d8c946..78bf97ab0524 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1908,10 +1908,6 @@ bool ixgbe_cleanup_headers(struct ixgbe_ring *rx_ring,
 {
 	struct net_device *netdev = rx_ring->netdev;
 
-	/* XDP packets use error pointer so abort at this point */
-	if (IS_ERR(skb))
-		return true;
-
 	/* Verify netdev is present, and that packet does not have any
 	 * errors that would be unacceptable to the netdev.
 	 */
@@ -2219,9 +2215,9 @@ static struct sk_buff *ixgbe_build_skb(struct ixgbe_ring *rx_ring,
 	return skb;
 }
 
-static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
-				     struct ixgbe_ring *rx_ring,
-				     struct xdp_buff *xdp)
+static int ixgbe_run_xdp(struct ixgbe_adapter *adapter,
+			 struct ixgbe_ring *rx_ring,
+			 struct xdp_buff *xdp)
 {
 	int err, result = IXGBE_XDP_PASS;
 	struct bpf_prog *xdp_prog;
@@ -2271,7 +2267,7 @@ static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
 		break;
 	}
 xdp_out:
-	return ERR_PTR(-result);
+	return result;
 }
 
 static unsigned int ixgbe_rx_frame_truesize(struct ixgbe_ring *rx_ring,
@@ -2329,6 +2325,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 	unsigned int offset = rx_ring->rx_offset;
 	unsigned int xdp_xmit = 0;
 	struct xdp_buff xdp;
+	int xdp_res;
 
 	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
 #if (PAGE_SIZE < 8192)
@@ -2374,12 +2371,10 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			/* At larger PAGE_SIZE, frame_sz depend on len size */
 			xdp.frame_sz = ixgbe_rx_frame_truesize(rx_ring, size);
 #endif
-			skb = ixgbe_run_xdp(adapter, rx_ring, &xdp);
+			xdp_res = ixgbe_run_xdp(adapter, rx_ring, &xdp);
 		}
 
-		if (IS_ERR(skb)) {
-			unsigned int xdp_res = -PTR_ERR(skb);
-
+		if (xdp_res) {
 			if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
 				xdp_xmit |= xdp_res;
 				ixgbe_rx_buffer_flip(rx_ring, rx_buffer, size);
@@ -2399,7 +2394,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_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;
@@ -2413,7 +2408,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			continue;
 
 		/* verify the packet layout is correct */
-		if (ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
+		if (xdp_res || ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
 			continue;
 
 		/* probably a little skewed due to removing CRC */
-- 
2.34.1

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

[Yue Haibing]

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 1/4] igc: Fix passing 0 to ERR_PTR in igc_xdp_run_prog()

[Maciej Fijalkowski]

On Fri, Oct 18, 2024 at 10:37:31AM +0800, Yue Haibing wrote:
> igc_xdp_run_prog() converts customed xdp action to a negative error code
> with the sk_buff pointer type which be checked with IS_ERR in
> igc_clean_rx_irq(). Remove this error pointer handing instead use plain
> int return value to fix this smatch warnings:
> 
> drivers/net/ethernet/intel/igc/igc_main.c:2533
>  igc_xdp_run_prog() warn: passing zero to 'ERR_PTR'
> 
> Fixes: 26575105d6ed ("igc: Add initial XDP support")
> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/igc/igc_main.c | 20 +++++++-------------
>  1 file changed, 7 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index 6e70bca15db1..5e44c2546a12 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -2123,10 +2123,6 @@ static bool igc_cleanup_headers(struct igc_ring *rx_ring,
>  				union igc_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;
> -
>  	if (unlikely(igc_test_staterr(rx_desc, IGC_RXDEXT_STATERR_RXE))) {
>  		struct net_device *netdev = rx_ring->netdev;
>  
> @@ -2515,8 +2511,7 @@ static int __igc_xdp_run_prog(struct igc_adapter *adapter,
>  	}
>  }
>  
> -static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
> -					struct xdp_buff *xdp)
> +static int igc_xdp_run_prog(struct igc_adapter *adapter, struct xdp_buff *xdp)
>  {
>  	struct bpf_prog *prog;
>  	int res;
> @@ -2530,7 +2525,7 @@ static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
>  	res = __igc_xdp_run_prog(adapter, prog, xdp);
>  
>  out:
> -	return ERR_PTR(-res);
> +	return res;
>  }
>  
>  /* This function assumes __netif_tx_lock is held by the caller. */
> @@ -2585,6 +2580,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
>  	struct sk_buff *skb = rx_ring->skb;
>  	u16 cleaned_count = igc_desc_unused(rx_ring);
>  	int xdp_status = 0, rx_buffer_pgcnt;
> +	int xdp_res = 0;
>  
>  	while (likely(total_packets < budget)) {
>  		struct igc_xdp_buff ctx = { .rx_ts = NULL };
> @@ -2630,12 +2626,10 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
>  			xdp_buff_clear_frags_flag(&ctx.xdp);
>  			ctx.rx_desc = rx_desc;
>  
> -			skb = igc_xdp_run_prog(adapter, &ctx.xdp);
> +			xdp_res = igc_xdp_run_prog(adapter, &ctx.xdp);
>  		}
>  
> -		if (IS_ERR(skb)) {
> -			unsigned int xdp_res = -PTR_ERR(skb);
> -
> +		if (xdp_res) {
>  			switch (xdp_res) {
>  			case IGC_XDP_CONSUMED:
>  				rx_buffer->pagecnt_bias++;
> @@ -2657,7 +2651,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
>  			skb = igc_construct_skb(rx_ring, rx_buffer, &ctx);
>  
>  		/* exit if we failed to retrieve a buffer */
> -		if (!skb) {
> +		if (!xdp_res && !skb) {
>  			rx_ring->rx_stats.alloc_failed++;
>  			rx_buffer->pagecnt_bias++;
>  			set_bit(IGC_RING_FLAG_RX_ALLOC_FAILED, &rx_ring->flags);
> @@ -2672,7 +2666,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
>  			continue;
>  
>  		/* verify the packet layout is correct */
> -		if (igc_cleanup_headers(rx_ring, rx_desc, skb)) {
> +		if (xdp_res || igc_cleanup_headers(rx_ring, rx_desc, skb)) {
>  			skb = NULL;
>  			continue;
>  		}
> -- 
> 2.34.1
> 

Re: [PATCH v2 net 2/4] igb: Fix passing 0 to ERR_PTR in igb_run_xdp()

[Maciej Fijalkowski]

On Fri, Oct 18, 2024 at 10:37:32AM +0800, Yue Haibing wrote:
> igb_run_xdp() converts customed xdp action to a negative error code
> with the sk_buff pointer type which be checked with IS_ERR in
> igb_clean_rx_irq(). Remove this error pointer handing instead use plain
> int return value.
> 
> Fixes: 9cbc948b5a20 ("igb: add XDP support")
> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> index f1d088168723..50c23dfcf304 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -8584,9 +8584,8 @@ static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring,
>  	return skb;
>  }
>  
> -static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
> -				   struct igb_ring *rx_ring,
> -				   struct xdp_buff *xdp)
> +static int igb_run_xdp(struct igb_adapter *adapter, struct igb_ring *rx_ring,
> +		       struct xdp_buff *xdp)
>  {
>  	int err, result = IGB_XDP_PASS;
>  	struct bpf_prog *xdp_prog;
> @@ -8626,7 +8625,7 @@ static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
>  		break;
>  	}
>  xdp_out:
> -	return ERR_PTR(-result);
> +	return result;
>  }
>  
>  static unsigned int igb_rx_frame_truesize(struct igb_ring *rx_ring,
> @@ -8752,10 +8751,6 @@ static bool igb_cleanup_headers(struct igb_ring *rx_ring,
>  				union e1000_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;
> -
>  	if (unlikely((igb_test_staterr(rx_desc,
>  				       E1000_RXDEXT_ERR_FRAME_ERR_MASK)))) {
>  		struct net_device *netdev = rx_ring->netdev;
> @@ -8879,6 +8874,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
>  	struct xdp_buff xdp;
>  	u32 frame_sz = 0;
>  	int rx_buf_pgcnt;
> +	int xdp_res = 0;
>  
>  	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
>  #if (PAGE_SIZE < 8192)
> @@ -8936,12 +8932,10 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
>  			/* At larger PAGE_SIZE, frame_sz depend on len size */
>  			xdp.frame_sz = igb_rx_frame_truesize(rx_ring, size);
>  #endif
> -			skb = igb_run_xdp(adapter, rx_ring, &xdp);
> +			xdp_res = igb_run_xdp(adapter, rx_ring, &xdp);
>  		}
>  
> -		if (IS_ERR(skb)) {
> -			unsigned int xdp_res = -PTR_ERR(skb);
> -
> +		if (xdp_res) {
>  			if (xdp_res & (IGB_XDP_TX | IGB_XDP_REDIR)) {
>  				xdp_xmit |= xdp_res;
>  				igb_rx_buffer_flip(rx_ring, rx_buffer, size);
> @@ -8960,7 +8954,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
>  						&xdp, timestamp);
>  
>  		/* exit if we failed to retrieve a buffer */
> -		if (!skb) {
> +		if (!xdp_res && !skb) {
>  			rx_ring->rx_stats.alloc_failed++;
>  			rx_buffer->pagecnt_bias++;
>  			break;
> @@ -8974,7 +8968,7 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
>  			continue;
>  
>  		/* verify the packet layout is correct */
> -		if (igb_cleanup_headers(rx_ring, rx_desc, skb)) {
> +		if (xdp_res || igb_cleanup_headers(rx_ring, rx_desc, skb)) {
>  			skb = NULL;
>  			continue;
>  		}
> -- 
> 2.34.1
> 
> 

Re: [PATCH v2 net 3/4] ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()

[Maciej Fijalkowski]

On Fri, Oct 18, 2024 at 10:37:33AM +0800, Yue Haibing wrote:
> ixgbe_run_xdp() converts customed xdp action to a negative error code
> with the sk_buff pointer type which be checked with IS_ERR in
> ixgbe_clean_rx_irq(). Remove this error pointer handing instead use
> plain int return value.
> 
> Fixes: 924708081629 ("ixgbe: add XDP support for pass and drop actions")
> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 23 ++++++++-----------
>  1 file changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 8b8404d8c946..78bf97ab0524 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -1908,10 +1908,6 @@ bool ixgbe_cleanup_headers(struct ixgbe_ring *rx_ring,
>  {
>  	struct net_device *netdev = rx_ring->netdev;
>  
> -	/* XDP packets use error pointer so abort at this point */
> -	if (IS_ERR(skb))
> -		return true;
> -
>  	/* Verify netdev is present, and that packet does not have any
>  	 * errors that would be unacceptable to the netdev.
>  	 */
> @@ -2219,9 +2215,9 @@ static struct sk_buff *ixgbe_build_skb(struct ixgbe_ring *rx_ring,
>  	return skb;
>  }
>  
> -static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
> -				     struct ixgbe_ring *rx_ring,
> -				     struct xdp_buff *xdp)
> +static int ixgbe_run_xdp(struct ixgbe_adapter *adapter,
> +			 struct ixgbe_ring *rx_ring,
> +			 struct xdp_buff *xdp)

please align args. checkpatch didn't yell at you?

>  {
>  	int err, result = IXGBE_XDP_PASS;
>  	struct bpf_prog *xdp_prog;
> @@ -2271,7 +2267,7 @@ static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
>  		break;
>  	}
>  xdp_out:
> -	return ERR_PTR(-result);
> +	return result;
>  }
>  
>  static unsigned int ixgbe_rx_frame_truesize(struct ixgbe_ring *rx_ring,
> @@ -2329,6 +2325,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>  	unsigned int offset = rx_ring->rx_offset;
>  	unsigned int xdp_xmit = 0;
>  	struct xdp_buff xdp;
> +	int xdp_res;
>  
>  	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
>  #if (PAGE_SIZE < 8192)
> @@ -2374,12 +2371,10 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>  			/* At larger PAGE_SIZE, frame_sz depend on len size */
>  			xdp.frame_sz = ixgbe_rx_frame_truesize(rx_ring, size);
>  #endif
> -			skb = ixgbe_run_xdp(adapter, rx_ring, &xdp);
> +			xdp_res = ixgbe_run_xdp(adapter, rx_ring, &xdp);
>  		}
>  
> -		if (IS_ERR(skb)) {
> -			unsigned int xdp_res = -PTR_ERR(skb);
> -
> +		if (xdp_res) {
>  			if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
>  				xdp_xmit |= xdp_res;
>  				ixgbe_rx_buffer_flip(rx_ring, rx_buffer, size);
> @@ -2399,7 +2394,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_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;
> @@ -2413,7 +2408,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>  			continue;
>  
>  		/* verify the packet layout is correct */
> -		if (ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
> +		if (xdp_res || ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
>  			continue;
>  
>  		/* probably a little skewed due to removing CRC */
> -- 
> 2.34.1
> 

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

[Maciej Fijalkowski]

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 0/4] Fix passing 0 to ERR_PTR in intel ether drivers

[Keller, Jacob E]

> -----Original Message-----
> From: Yue Haibing <yuehaibing@huawei.com>
> Sent: Thursday, October 17, 2024 7:38 PM
> To: Nguyen, Anthony L <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw
> <przemyslaw.kitszel@intel.com>; davem@davemloft.net; edumazet@google.com;
> kuba@kernel.org; pabeni@redhat.com; ast@kernel.org; daniel@iogearbox.net;
> hawk@kernel.org; john.fastabend@gmail.com; Fijalkowski, Maciej
> <maciej.fijalkowski@intel.com>; vedang.patel@intel.com; Joseph, Jithu
> <jithu.joseph@intel.com>; andre.guedes@intel.com; horms@kernel.org; Keller,
> Jacob E <jacob.e.keller@intel.com>; sven.auhagen@voleatech.de;
> alexander.h.duyck@intel.com
> Cc: intel-wired-lan@lists.osuosl.org; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org; bpf@vger.kernel.org; yuehaibing@huawei.com
> Subject: [PATCH v2 net 0/4] Fix passing 0 to ERR_PTR in intel ether drivers
> 
> Fixing sparse error in xdp run code by introducing new variable xdp_res
> instead of overloading this into the skb pointer as i40e drivers done
> in commit 12738ac4754e ("i40e: Fix sparse errors in i40e_txrx.c") and
> commit ae4393dfd472 ("i40e: fix broken XDP support").
> 
> v2: Fix this as i40e drivers done instead of return NULL in xdp run code
> 

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>

Appreciate taking the time to fix all the cases.

> Yue Haibing (4):
>   igc: Fix passing 0 to ERR_PTR in igc_xdp_run_prog()
>   igb: Fix passing 0 to ERR_PTR in igb_run_xdp()
>   ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()
>   ixgbevf: Fix passing 0 to ERR_PTR in ixgbevf_run_xdp()
> 
>  drivers/net/ethernet/intel/igb/igb_main.c     | 22 +++++++-----------
>  drivers/net/ethernet/intel/igc/igc_main.c     | 20 ++++++----------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 23 ++++++++-----------
>  .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 23 ++++++++-----------
>  4 files changed, 34 insertions(+), 54 deletions(-)
> 
> --
> 2.34.1
> 

Re: [PATCH v2 net 3/4] ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()

[Yue Haibing]

On 2024/10/18 20:22, Maciej Fijalkowski wrote:
> On Fri, Oct 18, 2024 at 10:37:33AM +0800, Yue Haibing wrote:
>> ixgbe_run_xdp() converts customed xdp action to a negative error code
>> with the sk_buff pointer type which be checked with IS_ERR in
>> ixgbe_clean_rx_irq(). Remove this error pointer handing instead use
>> plain int return value.
>>
>> Fixes: 924708081629 ("ixgbe: add XDP support for pass and drop actions")
>> Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
>> ---
>>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 23 ++++++++-----------
>>  1 file changed, 9 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> index 8b8404d8c946..78bf97ab0524 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> @@ -1908,10 +1908,6 @@ bool ixgbe_cleanup_headers(struct ixgbe_ring *rx_ring,
>>  {
>>  	struct net_device *netdev = rx_ring->netdev;
>>  
>> -	/* XDP packets use error pointer so abort at this point */
>> -	if (IS_ERR(skb))
>> -		return true;
>> -
>>  	/* Verify netdev is present, and that packet does not have any
>>  	 * errors that would be unacceptable to the netdev.
>>  	 */
>> @@ -2219,9 +2215,9 @@ static struct sk_buff *ixgbe_build_skb(struct ixgbe_ring *rx_ring,
>>  	return skb;
>>  }
>>  
>> -static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
>> -				     struct ixgbe_ring *rx_ring,
>> -				     struct xdp_buff *xdp)
>> +static int ixgbe_run_xdp(struct ixgbe_adapter *adapter,
>> +			 struct ixgbe_ring *rx_ring,
>> +			 struct xdp_buff *xdp)
> 
> please align args. checkpatch didn't yell at you?

These have aligned in my patch and checkpatch passed.

yuehaibing@localhost:~/code/net$ ./scripts/checkpatch.pl 0003-ixgbe-Fix-passing-0-to-ERR_PTR-in-ixgbe_run_xdp.patch
total: 0 errors, 0 warnings, 0 checks, 67 lines checked

0003-ixgbe-Fix-passing-0-to-ERR_PTR-in-ixgbe_run_xdp.patch has no obvious style problems and is ready for submission.

> 
>>  {
>>  	int err, result = IXGBE_XDP_PASS;
>>  	struct bpf_prog *xdp_prog;
>> @@ -2271,7 +2267,7 @@ static struct sk_buff *ixgbe_run_xdp(struct ixgbe_adapter *adapter,
>>  		break;
>>  	}
>>  xdp_out:
>> -	return ERR_PTR(-result);
>> +	return result;
>>  }
>>  
>>  static unsigned int ixgbe_rx_frame_truesize(struct ixgbe_ring *rx_ring,
>> @@ -2329,6 +2325,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>>  	unsigned int offset = rx_ring->rx_offset;
>>  	unsigned int xdp_xmit = 0;
>>  	struct xdp_buff xdp;
>> +	int xdp_res;
>>  
>>  	/* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
>>  #if (PAGE_SIZE < 8192)
>> @@ -2374,12 +2371,10 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>>  			/* At larger PAGE_SIZE, frame_sz depend on len size */
>>  			xdp.frame_sz = ixgbe_rx_frame_truesize(rx_ring, size);
>>  #endif
>> -			skb = ixgbe_run_xdp(adapter, rx_ring, &xdp);
>> +			xdp_res = ixgbe_run_xdp(adapter, rx_ring, &xdp);
>>  		}
>>  
>> -		if (IS_ERR(skb)) {
>> -			unsigned int xdp_res = -PTR_ERR(skb);
>> -
>> +		if (xdp_res) {
>>  			if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
>>  				xdp_xmit |= xdp_res;
>>  				ixgbe_rx_buffer_flip(rx_ring, rx_buffer, size);
>> @@ -2399,7 +2394,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_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;
>> @@ -2413,7 +2408,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
>>  			continue;
>>  
>>  		/* verify the packet layout is correct */
>> -		if (ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
>> +		if (xdp_res || ixgbe_cleanup_headers(rx_ring, rx_desc, skb))
>>  			continue;
>>  
>>  		/* probably a little skewed due to removing CRC */
>> -- 
>> 2.34.1
>>
> 
> 
> .

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

[Yue Haibing]

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
>>
> 
> .