Re: [dpdk-dev] [PATCH] net/iavf: fix adding multicast MAC address

["Xing, Beilei" <beilei.xing@intel.com>]

> -----Original Message-----
> From: Peng, Yuan <yuan.peng@intel.com>
> Sent: Thursday, October 15, 2020 1:14 PM
> To: Sun, GuinanX <guinanx.sun@intel.com>; dev@dpdk.org
> Cc: Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>;
> Zhang, Qi Z <qi.z.zhang@intel.com>; Sun, GuinanX <guinanx.sun@intel.com>
> Subject: RE: [dpdk-dev] [PATCH] net/iavf: fix adding multicast MAC address
> 
> Test-by Peng, Yuan <yuan.peng@intel.com>
> 
> 
> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Guinan Sun
> Sent: Thursday, October 15, 2020 10:02 AM
> To: dev@dpdk.org
> Cc: Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>;
> Zhang, Qi Z <qi.z.zhang@intel.com>; Sun, GuinanX <guinanx.sun@intel.com>
> Subject: [dpdk-dev] [PATCH] net/iavf: fix adding multicast MAC address
> 
> When the multicast address is added, it will flush previous addresses first, and
> then add new ones.
> So when adding an address that exceeds the upper limit causes a failure, you
> need to add the previous address list back. This patch fixes the issue.
> 
> Fixes: 05e4c3aff35f ("net/iavf: support multicast configuration")
> 
> Signed-off-by: Guinan Sun <guinanx.sun@intel.com>
> ---
>  drivers/net/iavf/iavf_ethdev.c | 30 ++++++++++++++++++++++--------
> drivers/net/iavf/iavf_vchnl.c  |  3 ---
>  2 files changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index e68e3bc71..042edadd9 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -164,7 +164,14 @@ iavf_set_mc_addr_list(struct rte_eth_dev *dev,
>  	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);
>  	struct iavf_adapter *adapter =
>  		IAVF_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
> -	int err;
> +	int err, temp_err;
> +
> +	if (mc_addrs_num > IAVF_NUM_MACADDR_MAX) {
> +		PMD_DRV_LOG(ERR,
> +			    "can't add more than a limited number (%u) of
> addresses.",
> +			    (uint32_t)IAVF_NUM_MACADDR_MAX);
> +		return -EINVAL;
> +	}
> 
>  	/* flush previous addresses */
>  	err = iavf_add_del_mc_addr_list(adapter, vf->mc_addrs, vf-
> >mc_addrs_num, @@ -172,17 +179,24 @@ iavf_set_mc_addr_list(struct
> rte_eth_dev *dev,
>  	if (err)
>  		return err;
> 
> -	vf->mc_addrs_num = 0;
> -
>  	/* add new ones */
>  	err = iavf_add_del_mc_addr_list(adapter, mc_addrs, mc_addrs_num,
> true);
> -	if (err)
> -		return err;
> 
> -	vf->mc_addrs_num = mc_addrs_num;
> -	memcpy(vf->mc_addrs, mc_addrs, mc_addrs_num *
> sizeof(*mc_addrs));
> +	if (err) {
> +		/* When adding new addresses fail, need to add the
> +		 * previous addresses back.
> +		 */
> +		temp_err = iavf_add_del_mc_addr_list(adapter, vf->mc_addrs,
> +						     vf->mc_addrs_num, true);

Can we reuse err here?

> +		if (temp_err)
> +			return temp_err;
> +	} else {
> +		vf->mc_addrs_num = mc_addrs_num;
> +		memcpy(vf->mc_addrs,
> +		       mc_addrs, mc_addrs_num * sizeof(*mc_addrs));
> +	}
> 
> -	return 0;
> +	return err;
>  }
> 
>  static int
> diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c index
> db0b76876..a2295f879 100644
> --- a/drivers/net/iavf/iavf_vchnl.c
> +++ b/drivers/net/iavf/iavf_vchnl.c
> @@ -1107,9 +1107,6 @@ iavf_add_del_mc_addr_list(struct iavf_adapter
> *adapter,
>  	if (mc_addrs == NULL || mc_addrs_num == 0)
>  		return 0;
> 
> -	if (mc_addrs_num > IAVF_NUM_MACADDR_MAX)
> -		return -EINVAL;
> -
>  	list = (struct virtchnl_ether_addr_list *)cmd_buffer;
>  	list->vsi_id = vf->vsi_res->vsi_id;
>  	list->num_elements = mc_addrs_num;
> --
> 2.13.6