[PATCH v8 2/2] app/testpmd: conserve offload flags of mbuf

[Yongseok Koh <yskoh@mellanox.com>]

This patch is to accommodate an experimental feature of mbuf - external
buffer attachment. If mbuf is attached to an external buffer, its ol_flags
will have EXT_ATTACHED_MBUF set. Without enabling/using the feature,
everything remains same.

If PMD delivers Rx packets with non-direct mbuf, ol_flags should not be
overwritten. For mlx5 PMD, if Multi-Packet RQ is enabled, Rx packets could
be carried with externally attached mbufs.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>

v8:
* inherit flags from mbuf instead of checking !RTE_MBUF_DIRECT().
* fix a bug - update flags on per-packet basis.

---
 app/test-pmd/csumonly.c | 3 ++-
 app/test-pmd/macfwd.c   | 3 ++-
 app/test-pmd/macswap.c  | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index 53b98412a..0bb88cf7d 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -737,7 +737,8 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 		m = pkts_burst[i];
 		info.is_tunnel = 0;
 		info.pkt_len = rte_pktmbuf_pkt_len(m);
-		tx_ol_flags = 0;
+		tx_ol_flags = m->ol_flags &
+			      (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 		rx_ol_flags = m->ol_flags;
 
 		/* Update the L3/L4 checksum error packet statistics */
diff --git a/app/test-pmd/macfwd.c b/app/test-pmd/macfwd.c
index 2adce7019..7cac757a0 100644
--- a/app/test-pmd/macfwd.c
+++ b/app/test-pmd/macfwd.c
@@ -96,7 +96,8 @@ pkt_burst_mac_forward(struct fwd_stream *fs)
 				&eth_hdr->d_addr);
 		ether_addr_copy(&ports[fs->tx_port].eth_addr,
 				&eth_hdr->s_addr);
-		mb->ol_flags = ol_flags;
+		mb->ol_flags &= IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF;
+		mb->ol_flags |= ol_flags;
 		mb->l2_len = sizeof(struct ether_hdr);
 		mb->l3_len = sizeof(struct ipv4_hdr);
 		mb->vlan_tci = txp->tx_vlan_id;
diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c
index e2cc4812c..a8384d5b8 100644
--- a/app/test-pmd/macswap.c
+++ b/app/test-pmd/macswap.c
@@ -127,7 +127,8 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
 		ether_addr_copy(&eth_hdr->s_addr, &eth_hdr->d_addr);
 		ether_addr_copy(&addr, &eth_hdr->s_addr);
 
-		mb->ol_flags = ol_flags;
+		mb->ol_flags &= IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF;
+		mb->ol_flags |= ol_flags;
 		mb->l2_len = sizeof(struct ether_hdr);
 		mb->l3_len = sizeof(struct ipv4_hdr);
 		mb->vlan_tci = txp->tx_vlan_id;
-- 
2.11.0