RE: [PATCH] net/iavf: fix iavf crashed on dev_stop when running in multi-process mode

["Zhang, Qi Z" <qi.z.zhang@intel.com>]

> -----Original Message-----
> From: Ke Zhang <ke1x.zhang@intel.com>
> Sent: Saturday, April 2, 2022 5:51 PM
> To: Li, Xiaoyun <xiaoyun.li@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>;
> Xing, Beilei <beilei.xing@intel.com>; dev@dpdk.org
> Cc: Zhang, Ke1X <ke1x.zhang@intel.com>
> Subject: [PATCH] net/iavf: fix iavf crashed on dev_stop when running in
> multi-process mode
> 
> In the multi process environment, the sub process operates on the shared
> memory and changes the function pointer of the main process, resulting in
> the failure to find the address of the function when main process releasing,
> resulting in crash.
> 
> similar with commit<20b631efe785819eb77aabbf500b3352e5731bdb>
> 
> Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
> ---
>  drivers/net/iavf/iavf_rxtx.c            | 27 ++++++++++++++-----------
>  drivers/net/iavf/iavf_rxtx.h            |  6 +++---
>  drivers/net/iavf/iavf_rxtx_vec_avx512.c |  4 ++--
>  drivers/net/iavf/iavf_rxtx_vec_sse.c    |  8 ++++----
>  4 files changed, 24 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c index
> 16e8d021f9..197c03cd31 100644
> --- a/drivers/net/iavf/iavf_rxtx.c
> +++ b/drivers/net/iavf/iavf_rxtx.c
> @@ -362,6 +362,9 @@ release_txq_mbufs(struct iavf_tx_queue *txq)
>  	}
>  }
> 
> +const struct iavf_rxq_ops *iavf_rxq_release_mbufs_ops; const struct
> +iavf_txq_ops *iavf_txq_release_mbufs_ops;


> +
>  static const struct iavf_rxq_ops def_rxq_ops = {
>  	.release_mbufs = release_rxq_mbufs,
>  };
> @@ -674,7 +677,7 @@ iavf_dev_rx_queue_setup(struct rte_eth_dev *dev,
> uint16_t queue_idx,
>  	rxq->q_set = true;
>  	dev->data->rx_queues[queue_idx] = rxq;
>  	rxq->qrx_tail = hw->hw_addr + IAVF_QRX_TAIL1(rxq->queue_id);
> -	rxq->ops = &def_rxq_ops;
> +	iavf_rxq_release_mbufs_ops = &def_rxq_ops;

This is not correct. 
Now we replace per-queue ops with a global ops which is not expected.

Please reference method of below patch

commit 0ed16e01313e1f8930dc6a52b22159b20269d4e0
Author: Steve Yang <stevex.yang@intel.com>
Date:   Mon Feb 28 09:48:59 2022 +0000

    net/iavf: fix function pointer in multi-process

...


> 
> diff --git a/drivers/net/iavf/iavf_rxtx_vec_sse.c
> b/drivers/net/iavf/iavf_rxtx_vec_sse.c
> index 717a227b2c..a782bed2e0 100644
> --- a/drivers/net/iavf/iavf_rxtx_vec_sse.c
> +++ b/drivers/net/iavf/iavf_rxtx_vec_sse.c
> @@ -1219,16 +1219,16 @@ static const struct iavf_txq_ops sse_vec_txq_ops
> = {  };
> 
>  int __rte_cold
> -iavf_txq_vec_setup(struct iavf_tx_queue *txq)
> +iavf_txq_vec_setup(const struct iavf_txq_ops **txq_ops)
>  {
> -	txq->ops = &sse_vec_txq_ops;
> +	*txq_ops = &sse_vec_txq_ops;
>  	return 0;
>  }
> 
>  int __rte_cold
> -iavf_rxq_vec_setup(struct iavf_rx_queue *rxq)
> +iavf_rxq_vec_setup(struct iavf_rx_queue *rxq, const struct iavf_rxq_ops
> +**rxq_ops)
>  {
> -	rxq->ops = &sse_vec_rxq_ops;
> +	*rxq_ops = &sse_vec_rxq_ops;
>  	return iavf_rxq_vec_setup_default(rxq);  }

seems lots of redundant in  iavf_rxtx_vec.sse.c 

Can we move iavf_r(t)xq_vec_setup | sse_vec_r(t)xq_ops into iavf_rxtx.c and delete iavf_r(t)x_queue_release_mbufs_sse)?

Btw, We can keep this patch unchanged, a separated patch to refact the code is expected.


> 
> --
> 2.25.1