Re: [dpdk-dev] [PATCH v1 1/2] net/hinic: fix outer_l3_len parse error

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 10/31/2020 3:38 AM, Xiaoyun wang wrote:
> This patch fixes outer_l3_len parse error when
> PKT_TX_OUTER_IP_CKSUM is not set, which does not affect
> checksum function, just be consistent with mbuf meta
> information description.
> 
> Fixes: 8c8b61234ffd ("net/hinic: refactor checksum functions")
> Cc: stable@dpdk.org
> Signed-off-by: Xiaoyun wang <cloud.wangxiaoyun@huawei.com>
> ---
>   drivers/net/hinic/hinic_pmd_tx.c | 25 ++++++++++++-------------
>   1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/hinic/hinic_pmd_tx.c b/drivers/net/hinic/hinic_pmd_tx.c
> index 2dd4fe1..125627e 100644
> --- a/drivers/net/hinic/hinic_pmd_tx.c
> +++ b/drivers/net/hinic/hinic_pmd_tx.c
> @@ -779,26 +779,25 @@ static inline void hinic_analyze_tx_info(struct rte_mbuf *mbuf,
>   {
>   	struct rte_ether_hdr *eth_hdr;
>   	struct rte_vlan_hdr *vlan_hdr;
> -	struct rte_ipv4_hdr *ip4h;
> -	u16 pkt_type;
> -	u8 *hdr;
> +	struct rte_ipv4_hdr *ipv4_hdr;
> +	u16 eth_type;
>   
> -	hdr = (u8 *)rte_pktmbuf_mtod(mbuf, u8*);
> -	eth_hdr = (struct rte_ether_hdr *)hdr;
> -	pkt_type = rte_be_to_cpu_16(eth_hdr->ether_type);
> +	eth_hdr = rte_pktmbuf_mtod(mbuf, struct rte_ether_hdr *);
> +	eth_type = rte_be_to_cpu_16(eth_hdr->ether_type);
>   
> -	if (pkt_type == RTE_ETHER_TYPE_VLAN) {
> +	if (eth_type == RTE_ETHER_TYPE_VLAN) {
>   		off_info->outer_l2_len = ETHER_LEN_WITH_VLAN;
> -		vlan_hdr = (struct rte_vlan_hdr *)(hdr + 1);
> -		pkt_type = rte_be_to_cpu_16(vlan_hdr->eth_proto);
> +		vlan_hdr = (struct rte_vlan_hdr *)(eth_hdr + 1);
> +		eth_type = rte_be_to_cpu_16(vlan_hdr->eth_proto);
>   	} else {
>   		off_info->outer_l2_len = ETHER_LEN_NO_VLAN;
>   	}
>   
> -	if (pkt_type == RTE_ETHER_TYPE_IPV4) {
> -		ip4h = (struct rte_ipv4_hdr *)(hdr + off_info->outer_l2_len);
> -		off_info->outer_l3_len = rte_ipv4_hdr_len(ip4h);
> -	} else if (pkt_type == RTE_ETHER_TYPE_IPV6) {
> +	if (eth_type == RTE_ETHER_TYPE_IPV4) {
> +		ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf, struct rte_ipv4_hdr *,
> +						   off_info->outer_l2_len);
> +		off_info->outer_l3_len = rte_ipv4_hdr_len(ipv4_hdr);
> +	} else if (eth_type == RTE_ETHER_TYPE_IPV6) {
>   		/* not support ipv6 extension header */
>   		off_info->outer_l3_len = sizeof(struct rte_ipv6_hdr);
>   	}
> 


The actual fix is following [1] and rest is refactoring, right?
It is hard to catch the actual fix with refactoring, can you please describe the 
actual problem and fix in the commit log to clarify it?



[1]
  @@ -789,7 +789,7 @@ static inline void hinic_analyze_tx_info(struct rte_mbuf 
*mbuf,

          if (pkt_type == RTE_ETHER_TYPE_VLAN) {
                  off_info->outer_l2_len = ETHER_LEN_WITH_VLAN;
  -               vlan_hdr = (struct rte_vlan_hdr *)(hdr + 1);
  +               vlan_hdr = (struct rte_vlan_hdr *)(eth_hdr + 1);
                  pkt_type = rte_be_to_cpu_16(vlan_hdr->eth_proto);
          } else {
                  off_info->outer_l2_len = ETHER_LEN_NO_VLAN;