From: "Patil, Harish" <Harish.Patil@cavium.com>
To: zhouyangchao <zhouyates@gmail.com>,
Ferruh Yigit <ferruh.yigit@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Mody, Rasesh" <Rasesh.Mody@cavium.com>
Subject: Re: [dpdk-dev] [PATCH] net/bnx2x: reserve enough headroom for mbuf prepend
Date: Mon, 23 Apr 2018 17:10:24 +0000 [thread overview]
Message-ID: <D703615E.1BF9BD%Harish.Patil@cavium.com> (raw)
In-Reply-To: <CABLiTuxYAtevgtmusOZN7c8+o-rTt9bZ1B_MVx9pxCLLEKrbQw@mail.gmail.com>
From: zhouyangchao <zhouyates@gmail.com<mailto:zhouyates@gmail.com>>
Date: Wednesday, March 7, 2018 at 10:57 PM
To: Ferruh Yigit <ferruh.yigit@intel.com<mailto:ferruh.yigit@intel.com>>
Cc: "dev@dpdk.org<mailto:dev@dpdk.org>" <dev@dpdk.org<mailto:dev@dpdk.org>>, Harish Patil <Harish.Patil@cavium.com<mailto:Harish.Patil@cavium.com>>, "Mody, Rasesh" <Rasesh.Mody@cavium.com<mailto:Rasesh.Mody@cavium.com>>
Subject: Re: [dpdk-dev] [PATCH] net/bnx2x: reserve enough headroom for mbuf prepend
When allocating a new mbuf for Rx, the value of m->data_off should be
reset to its default value (RTE_PKTMBUF_HEADROOM), instead of reusing
the previous undefined value, which could cause the packet to have a too
small or too high headroom.
On Mon, Mar 5, 2018 at 11:28 PM Ferruh Yigit <ferruh.yigit@intel.com<mailto:ferruh.yigit@intel.com>> wrote:
On 2/6/2018 11:21 AM, zhouyangchao wrote:
Can you please provide more information why this patch is needed?
> Signed-off-by: Yangchao Zhou <zhouyates@gmail.com<mailto:zhouyates@gmail.com>>
> ---
> drivers/net/bnx2x/bnx2x_rxtx.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/bnx2x/bnx2x_rxtx.c b/drivers/net/bnx2x/bnx2x_rxtx.c
> index a0d4ac9..d8a3225 100644
> --- a/drivers/net/bnx2x/bnx2x_rxtx.c
> +++ b/drivers/net/bnx2x/bnx2x_rxtx.c
> @@ -140,7 +140,8 @@ bnx2x_dev_rx_queue_setup(struct rte_eth_dev *dev,
> return -ENOMEM;
> }
> rxq->sw_ring[idx] = mbuf;
> - rxq->rx_ring[idx] = mbuf->buf_iova;
> + rxq->rx_ring[idx] =
> + rte_cpu_to_le_64(rte_mbuf_data_iova_default(mbuf));
> }
> rxq->pkt_first_seg = NULL;
> rxq->pkt_last_seg = NULL;
> @@ -400,7 +401,8 @@ bnx2x_recv_pkts(void *p_rxq, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
>
> rx_mb = rxq->sw_ring[bd_cons];
> rxq->sw_ring[bd_cons] = new_mb;
> - rxq->rx_ring[bd_prod] = new_mb->buf_iova;
> + rxq->rx_ring[bd_prod] =
> + rte_cpu_to_le_64(rte_mbuf_data_iova_default(new_mb));
>
> rx_pref = NEXT_RX_BD(bd_cons) & MAX_RX_BD(rxq);
> rte_prefetch0(rxq->sw_ring[rx_pref]);
> @@ -409,7 +411,7 @@ bnx2x_recv_pkts(void *p_rxq, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
> rte_prefetch0(&rxq->sw_ring[rx_pref]);
> }
>
> - rx_mb->data_off = pad;
> + rx_mb->data_off = pad + RTE_PKTMBUF_HEADROOM;
> rx_mb->nb_segs = 1;
> rx_mb->next = NULL;
> rx_mb->pkt_len = rx_mb->data_len = len;
>
Acked-by: Harish Patil <harish.patil@cavium.com<mailto:harish.patil@cavium.com>>
next prev parent reply other threads:[~2018-04-23 17:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-06 11:21 zhouyangchao
2018-02-06 13:44 ` Ferruh Yigit
2018-03-05 15:28 ` Ferruh Yigit
2018-03-08 5:57 ` zhouyangchao
2018-04-20 10:31 ` Ferruh Yigit
2018-04-23 17:10 ` Patil, Harish [this message]
2018-04-24 12:38 ` Ferruh Yigit
-- strict thread matches above, loose matches on Subject: below --
2018-02-06 11:21 zhouyangchao
2018-02-06 11:21 zhouyangchao
2018-02-06 11:20 zhouyangchao
2018-02-06 11:20 zhouyangchao
2018-02-06 11:20 zhouyangchao
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