Re: [dpdk-dev] [PATCH v2 1/3] lib/librte_ip_frag: Remove PKT_TX_IP_CKSUM offload flags

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

Hi,
 
> Currently PKT_TX_IP_CKSUM is being set into mbuf->ol_flags
> during fragmentation and reassemble operation implicitly.
> Because of this, application is forced to use checksum offload
> whether it is supported by platform or not.
> 
> Also documentation does not provide any expected value of ol_flags
> in returned mbuf (reassembled or fragmented) so application will never
> come to know that which offloads are enabled. So transmission may be failed
> for the platforms which does not support checksum offload.
> 
> Also, IPv6 does not contain any checksum field in header so setting
> mbuf->ol_flags with PKT_TX_IP_CKSUM is itself invalid.
> 
> So removing mentioned flag from the library.

As there is a change in public API behavior, I think it deserves update in release notes.
Apart from that:
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>


> 
> Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
> ---
>  lib/librte_ip_frag/rte_ipv4_fragmentation.c | 1 -
>  lib/librte_ip_frag/rte_ipv4_reassembly.c    | 3 ---
>  lib/librte_ip_frag/rte_ipv6_reassembly.c    | 3 ---
>  3 files changed, 7 deletions(-)
> 
> diff --git a/lib/librte_ip_frag/rte_ipv4_fragmentation.c b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> index a96fb03..13e60fb 100644
> --- a/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> +++ b/lib/librte_ip_frag/rte_ipv4_fragmentation.c
> @@ -173,7 +173,6 @@ static inline void __free_fragments(struct rte_mbuf *mb[], uint32_t num)
>  		fragment_offset = (uint16_t)(fragment_offset +
>  		    out_pkt->pkt_len - sizeof(struct ipv4_hdr));
> 
> -		out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
>  		out_pkt->l3_len = sizeof(struct ipv4_hdr);
> 
>  		/* Write the fragment to the output list */
> diff --git a/lib/librte_ip_frag/rte_ipv4_reassembly.c b/lib/librte_ip_frag/rte_ipv4_reassembly.c
> index 1029b7a..4e20431 100644
> --- a/lib/librte_ip_frag/rte_ipv4_reassembly.c
> +++ b/lib/librte_ip_frag/rte_ipv4_reassembly.c
> @@ -66,9 +66,6 @@ struct rte_mbuf *
>  	m = fp->frags[IP_FIRST_FRAG_IDX].mb;
>  	fp->frags[IP_FIRST_FRAG_IDX].mb = NULL;
> 
> -	/* update mbuf fields for reassembled packet. */
> -	m->ol_flags |= PKT_TX_IP_CKSUM;
> -
>  	/* update ipv4 header for the reassembled packet */
>  	ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
> 
> diff --git a/lib/librte_ip_frag/rte_ipv6_reassembly.c b/lib/librte_ip_frag/rte_ipv6_reassembly.c
> index 855e3f7..eb8b849 100644
> --- a/lib/librte_ip_frag/rte_ipv6_reassembly.c
> +++ b/lib/librte_ip_frag/rte_ipv6_reassembly.c
> @@ -89,9 +89,6 @@ struct rte_mbuf *
>  	m = fp->frags[IP_FIRST_FRAG_IDX].mb;
>  	fp->frags[IP_FIRST_FRAG_IDX].mb = NULL;
> 
> -	/* update mbuf fields for reassembled packet. */
> -	m->ol_flags |= PKT_TX_IP_CKSUM;
> -
>  	/* update ipv6 header for the reassembled datagram */
>  	ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *, m->l2_len);
> 
> --
> 1.8.3.1