linux-kernel - Re: [PATCH v3 net-next] net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)

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Date:   Thu, 08 Apr 2021 16:46:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     decui@...rosoft.com
Cc:     kuba@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, wei.liu@...nel.org, liuwe@...rosoft.com,
        netdev@...r.kernel.org, leon@...nel.org, andrew@...n.ch,
        bernd@...rovitsch.priv.at, rdunlap@...radead.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: Re: [PATCH v3 net-next] net: mana: Add a driver for Microsoft
 Azure Network Adapter (MANA)

From: Dexuan Cui <decui@...rosoft.com>
Date: Thu,  8 Apr 2021 15:58:40 -0700

> +struct gdma_msg_hdr {
> +	u32 hdr_type;
> +	u32 msg_type;
> +	u16 msg_version;
> +	u16 hwc_msg_id;
> +	u32 msg_size;
> +} __packed;
> +
> +struct gdma_dev_id {
> +	union {
> +		struct {
> +			u16 type;
> +			u16 instance;
> +		};
> +
> +		u32 as_uint32;
> +	};
> +} __packed;

Please don't  use __packed unless absolutely necessary.  It generates suboptimal code (byte at a time
accesses etc.) and for many of these you don't even need it.

Thank you.