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From: Ferruh Yigit <ferruh.yigit@xilinx.com>
To: Ke Zhang <ke1x.zhang@intel.com>, <dev@dpdk.org>
Cc: <stable@dpdk.org>
Subject: Re: [PATCH v2] examples/kni: clear warning about discarding const qualifier
Date: Wed, 1 Jun 2022 16:44:17 +0100	[thread overview]
Message-ID: <421c3763-d4b0-aee5-eadf-d37e9a60a816@xilinx.com> (raw)
In-Reply-To: <20220601054525.7573-1-ke1x.zhang@intel.com>

On 6/1/2022 6:45 AM, Ke Zhang wrote:
> The warning info:
> warning: passing argument 1 of ‘memcpy’ discards ‘const’
> qualifier from pointer target type
> 
> Variable is done const intentionally to prevent using it
> directly, using the new helper functions :
> 'eth_hw_addr_set()' and 'eth_hw_addr_random()'
> 
> Fixes: ea6b39b5b847 ("kni: remove ethtool support")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
> ---
>   kernel/linux/kni/kni_misc.c | 4 ++--
>   kernel/linux/kni/kni_net.c  | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c
> index 780187d8bf..1da8e812b7 100644
> --- a/kernel/linux/kni/kni_misc.c
> +++ b/kernel/linux/kni/kni_misc.c
> @@ -403,10 +403,10 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num,
>   
>   	/* if user has provided a valid mac address */
>   	if (is_valid_ether_addr(dev_info.mac_addr))
> -		memcpy(net_dev->dev_addr, dev_info.mac_addr, ETH_ALEN);
> +		eth_hw_addr_set(net_dev, dev_info.mac_addr);
>   	else
>   		/* Generate random MAC address. */
> -		eth_random_addr(net_dev->dev_addr);
> +		eth_hw_addr_random(net_dev);
>   
>   	if (dev_info.mtu)
>   		net_dev->mtu = dev_info.mtu;
> diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
> index 29e5b9e21f..1da4f836aa 100644
> --- a/kernel/linux/kni/kni_net.c
> +++ b/kernel/linux/kni/kni_net.c
> @@ -779,7 +779,7 @@ kni_net_set_mac(struct net_device *netdev, void *p)
>   		return -EADDRNOTAVAIL;
>   
>   	memcpy(req.mac_addr, addr->sa_data, netdev->addr_len);
> -	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
> +	eth_hw_addr_set(netdev, addr->sa_data);
>   
>   	ret = kni_net_process_request(netdev, &req);
>   

Hi Ke,

We can't just use new APIs, otherwise this will fail with old kernels.
A version check is needed, please check 'compat.h' for various samples.

  reply	other threads:[~2022-06-01 15:44 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-31  9:13 [PATCH] " Ke Zhang
2022-05-31 14:55 ` Stephen Hemminger
2022-06-01  5:45 ` [PATCH v2] " Ke Zhang
2022-06-01 15:44   ` Ferruh Yigit [this message]
2022-06-05  9:47 ` [PATCH v3 1/2] kni: use dedicated function to set random MAC address Andrew Rybchenko
2022-06-05  9:47   ` [PATCH v3 2/2] kni: fix warning about discarding const qualifier Andrew Rybchenko
2022-06-08 11:13 ` [PATCH v4 0/2] kni: fix build warnings with Linux 5.17+ Andrew Rybchenko
2022-06-08 11:13   ` [PATCH v4 1/2] kni: use dedicated function to set random MAC address Andrew Rybchenko
2022-06-08 11:13   ` [PATCH v4 2/2] kni: fix warning about discarding const qualifier Andrew Rybchenko
2022-06-08 12:11 ` [PATCH v5 0/2] kni: fix build warnings with Linux 5.17+ Andrew Rybchenko
2022-06-08 12:11   ` [PATCH v5 1/2] kni: use dedicated function to set random MAC address Andrew Rybchenko
2022-06-08 12:52     ` Ferruh Yigit
2022-06-08 12:11   ` [PATCH v5 2/2] kni: fix warning about discarding const qualifier Andrew Rybchenko
2022-06-08 12:54     ` Ferruh Yigit
2022-06-08 13:10       ` Ferruh Yigit
2022-06-08 17:23   ` [PATCH v5 0/2] kni: fix build warnings with Linux 5.17+ Andrew Rybchenko
2022-06-01  3:24 [PATCH v2] examples/kni: clear warning about discarding const qualifier Ke Zhang

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