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From: Suanming Mou <suanmingm@nvidia.com>
To: Andre Muezerie <andremue@linux.microsoft.com>,
	Dariusz Sosnowski <dsosnowski@nvidia.com>,
	Slava Ovsiienko <viacheslavo@nvidia.com>,
	Bing Zhao <bingz@nvidia.com>, Ori Kam <orika@nvidia.com>,
	Matan Azrad <matan@nvidia.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: RE: Looks like a bug: operands are different enum types 'ibv_flow_attr_type' and 'ibv_flow_flags'
Date: Wed, 28 May 2025 12:50:46 +0000	[thread overview]
Message-ID: <CH2PR12MB9544F9D1AF5EA779333D389EC167A@CH2PR12MB9544.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20250527193256.GA6110@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>

Hi Andre,


> -----Original Message-----
> From: Andre Muezerie <andremue@linux.microsoft.com>
> Sent: Wednesday, May 28, 2025 3:33 AM
> To: Dariusz Sosnowski <dsosnowski@nvidia.com>; Slava Ovsiienko
> <viacheslavo@nvidia.com>; Bing Zhao <bingz@nvidia.com>; Ori Kam
> <orika@nvidia.com>; Suanming Mou <suanmingm@nvidia.com>; Matan
> Azrad <matan@nvidia.com>
> Cc: dev@dpdk.org
> Subject: Looks like a bug: operands are different enum types
> 'ibv_flow_attr_type' and 'ibv_flow_flags'
> 
> Hi Folks,
> 
> 
> Compiling with MSCS resulted in the warning below:
> 
> ../drivers/net/mlx5/mlx5_flow_dv.c(19636): warning C5287: operands are
> different enum types 'ibv_flow_attr_type' and 'ibv_flow_flags'; use an explicit
> cast to silence this warning
> 
> It looks like a legit bug. Here is the offending line:
> 
> 	struct mlx5dv_flow_matcher_attr dv_attr = {
> 		.type = IBV_FLOW_ATTR_NORMAL |
> IBV_FLOW_ATTR_FLAGS_EGRESS,
> 
> As the warning states, the constants in the bitwise operation belong to
> different enums, and these enums have overlaping values, which makes the
> bitwise operation very suspicious.
> On top of that, I see that struct mlx5dv_flow_matcher_attr has a field named
> "flags" which accepts values from ibv_flow_flags:
> 
> 	struct mlx5dv_flow_matcher_attr {
> 		enum ibv_flow_attr_type type;
> 		uint32_t flags; /* From enum ibv_flow_flags. */
> 
> Could someone more familiar with the code take a look and make a fix if
> needed? My goal here is just to get the code to compile with MSVC without
> warnings. I can add a cast to remove the warning if this is indeed how the
> code should be, but I don't want to do this unless I get confirmation that this
> would be the right course of action.

Yes, I think you are right. ` IBV_FLOW_ATTR_FLAGS_EGRESS ` should goes to flags.
Thanks for the reporting. 
Will first try to verify how it works even with the incorrect initialization.

> 
> Thanks,
> 
> Andre Muezerie

      reply	other threads:[~2025-05-28 12:50 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-27 19:32 Andre Muezerie
2025-05-28 12:50 ` Suanming Mou [this message]

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