[dpdk-dev] [PATCH] net/i40e/avf/ixgbe: remove unnecessary mbuf field initialization in PMD

[Rosen Xu]

Set the value of m->refcnt to 1, m->nb_segs to 1 and m->next to NULL
when the mbuf is initialized or stored inside the mempool (unused).
All of these are done in rte_pktmbuf_pool_create() and rte_pktmbuf_prefree_seg().
So we remove the redundant code from i40e, ixgbe and avf module.

Fixes: 8f094a9ac5d7 ("mbuf: set mbuf fields while in pool")
Cc: stable at dpdk.org

Signed-off-by: Rosen Xu <rosen.xu at intel.com>
---
 drivers/net/avf/avf_rxtx.c     | 6 ------
 drivers/net/i40e/i40e_rxtx.c   | 6 ------
 drivers/net/ixgbe/ixgbe_rxtx.c | 1 -
 3 files changed, 13 deletions(-)

diff --git a/drivers/net/avf/avf_rxtx.c b/drivers/net/avf/avf_rxtx.c
index e0c4583..b9051d6 100644
--- a/drivers/net/avf/avf_rxtx.c
+++ b/drivers/net/avf/avf_rxtx.c
@@ -221,10 +221,7 @@
 			return -ENOMEM;
 		}
 
-		rte_mbuf_refcnt_set(mbuf, 1);
-		mbuf->next = NULL;
 		mbuf->data_off = RTE_PKTMBUF_HEADROOM;
-		mbuf->nb_segs = 1;
 		mbuf->port = rxq->port_id;
 
 		dma_addr =
@@ -1239,10 +1236,7 @@
 			rte_prefetch0(rxep[i + 1]);
 
 		mb = rxep[i];
-		rte_mbuf_refcnt_set(mb, 1);
-		mb->next = NULL;
 		mb->data_off = RTE_PKTMBUF_HEADROOM;
-		mb->nb_segs = 1;
 		mb->port = rxq->port_id;
 		dma_addr = rte_cpu_to_le_64(rte_mbuf_data_iova_default(mb));
 		rxdp[i].read.hdr_addr = 0;
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 23256b7..b578957 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -550,10 +550,7 @@
 			rte_prefetch0(rxep[i + 1].mbuf);
 
 		mb = rxep[i].mbuf;
-		rte_mbuf_refcnt_set(mb, 1);
-		mb->next = NULL;
 		mb->data_off = RTE_PKTMBUF_HEADROOM;
-		mb->nb_segs = 1;
 		mb->port = rxq->port_id;
 		dma_addr = rte_cpu_to_le_64(\
 			rte_mbuf_data_iova_default(mb));
@@ -2411,10 +2408,7 @@
 			return -ENOMEM;
 		}
 
-		rte_mbuf_refcnt_set(mbuf, 1);
-		mbuf->next = NULL;
 		mbuf->data_off = RTE_PKTMBUF_HEADROOM;
-		mbuf->nb_segs = 1;
 		mbuf->port = rxq->port_id;
 
 		dma_addr =
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index 4b38247..72da571 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -1629,7 +1629,6 @@ uint16_t ixgbe_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 			mb->port = rxq->port_id;
 		}
 
-		rte_mbuf_refcnt_set(mb, 1);
 		mb->data_off = RTE_PKTMBUF_HEADROOM;
 
 		/* populate the descriptors */
-- 
1.8.3.1