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From: David Laight <David.Laight@ACULAB.COM>
To: 'Saeed Mahameed' <saeed@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	Tariq Toukan <tariqt@nvidia.com>, Aya Levin <ayal@nvidia.com>,
	Saeed Mahameed <saeedm@nvidia.com>
Subject: RE: [net 1/8] net/mlx5e: Fix incompatible casting
Date: Thu, 3 Jun 2021 21:02:50 +0000	[thread overview]
Message-ID: <7166b5e6ebc44198bbbec5afdcb699f5@AcuMS.aculab.com> (raw)
In-Reply-To: <20210602013723.1142650-2-saeed@kernel.org>

From: Saeed Mahameed
> Sent: 02 June 2021 02:37
> 
> Device supports setting of a single fec mode at a time, enforce this
> by bitmap_weight == 1. Input from fec command is in u32, avoid cast to
> unsigned long and use bitmap_from_arr32 to populate bitmap safely.
> 
...
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> index 8360289813f0..c4724742eef1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> @@ -1624,12 +1624,13 @@ static int mlx5e_set_fecparam(struct net_device *netdev,
>  {
>  	struct mlx5e_priv *priv = netdev_priv(netdev);
>  	struct mlx5_core_dev *mdev = priv->mdev;
> +	unsigned long fec_bitmap;
>  	u16 fec_policy = 0;
>  	int mode;
>  	int err;
> 
> -	if (bitmap_weight((unsigned long *)&fecparam->fec,
> -			  ETHTOOL_FEC_LLRS_BIT + 1) > 1)
> +	bitmap_from_arr32(&fec_bitmap, &fecparam->fec, sizeof(fecparam->fec) * BITS_PER_BYTE);
> +	if (bitmap_weight(&fec_bitmap, ETHTOOL_FEC_LLRS_BIT + 1) > 1)
>  		return -EOPNOTSUPP;

What is wrong with:
	if (fecparam->fec & (fecparam->fec - 1))
		return -EOPNOTSUPP;

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


  parent reply	other threads:[~2021-06-03 21:02 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02  1:37 [pull request][net 0/8] mlx5 fixes 2021-06-01 Saeed Mahameed
2021-06-02  1:37 ` [net 1/8] net/mlx5e: Fix incompatible casting Saeed Mahameed
2021-06-02 17:10   ` Jakub Kicinski
2021-06-02 20:30   ` patchwork-bot+netdevbpf
2021-06-03 21:02   ` David Laight [this message]
2021-06-02  1:37 ` [net 2/8] net/mlx5e: Disable TLS offload for uplink representor Saeed Mahameed
2021-06-02  1:37 ` [net 3/8] net/mlx5: Check firmware sync reset requested is set before trying to abort it Saeed Mahameed
2021-06-02  1:37 ` [net 4/8] net/mlx5e: Check for needed capability for cvlan matching Saeed Mahameed
2021-06-02  1:37 ` [net 5/8] net/mlx5e: Fix adding encap rules to slow path Saeed Mahameed
2021-06-02  1:37 ` [net 6/8] net/mlx5e: Fix HW TS with CQE compression according to profile Saeed Mahameed
2021-06-02  1:37 ` [net 7/8] net/mlx5e: Fix conflict with HW TS and CQE compression Saeed Mahameed
2021-06-02  1:37 ` [net 8/8] net/mlx5: DR, Create multi-destination flow table with level less than 64 Saeed Mahameed

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