[dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[guohongzhi]

From: Hongzhi Guo <guohongzhi1@huawei.com>

0xffff is invalid for IPv4 checksum(RFC1624)

Fixes: 6006818cfb26 ("net: new checksum functions")
Cc: stable@dpdk.org

Reviewed-By: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

Signed-off-by: Hongzhi Guo <guohongzhi1@huawei.com>
---
 lib/librte_net/rte_ip.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index 1ceb7b7..ece2e43 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -267,7 +267,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
 {
 	uint16_t cksum;
 	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
-	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
+	return (uint16_t)~cksum;
 }
 
 /**
-- 
2.21.0.windows.1

Re: [dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[Thomas Monjalon]

26/05/2020 12:08, guohongzhi:
> From: Hongzhi Guo <guohongzhi1@huawei.com>
> 
> 0xffff is invalid for IPv4 checksum(RFC1624)
> 
> Fixes: 6006818cfb26 ("net: new checksum functions")
> Cc: stable@dpdk.org
> 
> Reviewed-By: Morten Brørup <mb@smartsharesystems.com>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>
> 
> Signed-off-by: Hongzhi Guo <guohongzhi1@huawei.com>

The Signed-off should be in chronological order, before reviews.

As suggested in previous patch, the title should be
	net: fix IPv4 checksum

I am doing above modifications while merging.

More advices about submitting patches:
	- use -v2, -v3, etc when sending new versions
	- add a changelog below the line ---
	- use --in-reply-to to keep all versions threaded


> @@ -267,7 +267,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
>  {
>  	uint16_t cksum;
>  	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
> -	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
> +	return (uint16_t)~cksum;
>  }

Applied, thanks

[dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[guohongzhi]

0xffff is invalid for IPv4 checksum(RFC1624)

Fixes: 6006818cfb26 ("net: new checksum functions")

Reviewed-By: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

Signed-off-by: guohongzhi <guohongzhi1@huawei.com>
---
 lib/librte_net/rte_ip.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index 1ceb7b7..ece2e43 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -267,7 +267,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
 {
 	uint16_t cksum;
 	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
-	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
+	return (uint16_t)~cksum;
 }
 
 /**
-- 
2.21.0.windows.1

Re: [dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[Morten Brørup]

guohongzhi,

You must use your real name in the Signed-off-by line.

The signoff must be a real name and not an alias or nickname. For further details, please refer to: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#developer-s-certificate-of-origin-1-1


Med venlig hilsen / kind regards
- Morten Brørup

> -----Original Message-----
> From: guohongzhi [mailto:guohongzhi1@huawei.com]
> Sent: Tuesday, May 26, 2020 11:17 AM
> To: dev@dpdk.org
> Cc: olivier.matz@6wind.com; Morten Brørup;
> konstantin.ananyev@intel.com; jiayu.hu@intel.com;
> ferruh.yigit@intel.com; nicolas.chautru@intel.com;
> cristian.dumitrescu@intel.com; zhoujingbin@huawei.com;
> chenchanghu@huawei.com; jerry.lilijun@huawei.com;
> haifeng.lin@huawei.com; guohongzhi1@huawei.com
> Subject: [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating
> 
> 0xffff is invalid for IPv4 checksum(RFC1624)
> 
> Fixes: 6006818cfb26 ("net: new checksum functions")
> 
> Reviewed-By: Morten Brørup <mb@smartsharesystems.com>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>
> 
> Signed-off-by: guohongzhi <guohongzhi1@huawei.com>
> ---
>  lib/librte_net/rte_ip.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
> index 1ceb7b7..ece2e43 100644
> --- a/lib/librte_net/rte_ip.h
> +++ b/lib/librte_net/rte_ip.h
> @@ -267,7 +267,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
>  {
>  	uint16_t cksum;
>  	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
> -	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
> +	return (uint16_t)~cksum;
>  }
> 
>  /**
> --
> 2.21.0.windows.1
> 
> 

[dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[guohongzhi]

The function of rte_ipv4_cksum for calculating the
checksum of IPv4 header is incorrect.
This function will return checksum value like 0xffff.
This value, however, is considered an illegal checksum on some switches(like Trident3).

RFC 1624 specifies the IPv4 checksum as follows:
https://tools.ietf.org/rfc/rfc1624
Since there is guaranteed to be at least one
   non-zero field in the IP header, and the checksum field in the
   protocol header is the complement of the sum, the checksum field can
   never contain ~(+0), which is -0 (0xFFFF).  It can, however, contain
   ~(-0), which is +0 (0x0000).

---
 lib/librte_net/rte_ip.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index 1ceb7b7..ece2e43 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -267,7 +267,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
 {
 	uint16_t cksum;
 	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
-	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
+	return (uint16_t)~cksum;
 }
 
 /**
-- 
2.21.0.windows.1

Re: [dpdk-dev] [PATCH] lib/librte_net: fix bug for ipv4 checksum calculating

[Thomas Monjalon]

14/05/2020 03:27, guohongzhi:
> The function of rte_ipv4_cksum for calculating the
> checksum of IPv4 header is incorrect.
> This function will return checksum value like 0xffff.
> This value, however, is considered an illegal checksum on some switches(like Trident3).
> 
> RFC 1624 specifies the IPv4 checksum as follows:
> https://tools.ietf.org/rfc/rfc1624
> Since there is guaranteed to be at least one
>    non-zero field in the IP header, and the checksum field in the
>    protocol header is the complement of the sum, the checksum field can
>    never contain ~(+0), which is -0 (0xFFFF).  It can, however, contain
>    ~(-0), which is +0 (0x0000).
> 
> ---
>  lib/librte_net/rte_ip.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Suggested title:
	net: fix IPv4 checksum

Please send a v2 with your full name and add a Signed-off-by line.
You can check the contributing guidelines:
	http://core.dpdk.org/contribute/#send

You need to add these lines from previous reviews:

Fixes: 6006818cfb26 ("net: new checksum functions")
Cc: stable@dpdk.org

Reviewed-By: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>