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

[Zhang, Helin]

Hi Rosen

You may need to split the patches into 3, one per each PMD.
Also please get it reviewed by maintainers, and do/fix any patchwork check issues.
Thanks!

/Helin

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Rosen Xu
> Sent: Friday, January 19, 2018 11:02 AM
> To: Xing, Beilei; Zhang, Qi Z; Lu, Wenzhuo
> Cc: dev at dpdk.org; stable at dpdk.org
> Subject: [dpdk-dev] [PATCH] net/i40e/avf/ixgbe: remove unnecessary mbuf
> field initialization in PMD
> 
> 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