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

[Sunil Kumar Kori <skori@marvell.com>]

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.

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