linux-kernel - [PATCH 10/22] net/mlx5e: simplify mlx5e_set

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Date:   Tue, 10 May 2022 08:47:38 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        David Laight <David.Laight@...LAB.COM>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joe Perches <joe@...ches.com>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Nicholas Piggin <npiggin@...il.com>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        linux-kernel@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Leon Romanovsky <leon@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: [PATCH 10/22] net/mlx5e: simplify mlx5e_set_fecparam()

mlx5e_set_fecparam() used bitmap API to handle fecparam->fec. This is a
bad practice because ->fec is not a bitmap - it's an u32 mask.

The code wants to prevent user from passing ->fec with many modes
enables. For this purpose it's better to use MANY_BITS() macro, which
allows to avoid converting u32 to bitmap.

CC: David S. Miller <davem@...emloft.net>
CC: Eric Dumazet <edumazet@...gle.com>
CC: Jakub Kicinski <kuba@...nel.org>
CC: Leon Romanovsky <leon@...nel.org>
CC: Paolo Abeni <pabeni@...hat.com>
CC: Saeed Mahameed <saeedm@...dia.com>
CC: netdev@...r.kernel.org
CC: linux-rdma@...r.kernel.org
CC: linux-kernel@...r.kernel.org
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 6e80585d731f..316cb72c4cc8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1664,13 +1664,11 @@ 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;
 
-	bitmap_from_arr32(&fec_bitmap, &fecparam->fec, sizeof(fecparam->fec) * BITS_PER_BYTE);
-	if (bitmap_weight(&fec_bitmap, ETHTOOL_FEC_LLRS_BIT + 1) > 1)
+	if (MANY_BITS(fecparam->fec))
 		return -EOPNOTSUPP;
 
 	for (mode = 0; mode < ARRAY_SIZE(pplm_fec_2_ethtool); mode++) {
-- 
2.32.0