Re: [PATCH v2 17/18] hw/block/nvme: provide the mandatory subnqn field - Philippe Mathieu-Daudé

From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: Klaus Jensen <its@irrelevant.dk>, qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
	Dmitry Fomichev <Dmitry.Fomichev@wdc.com>,
	Klaus Jensen <k.jensen@samsung.com>,
	qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>,
	Keith Busch <kbusch@kernel.org>,
	Javier Gonzalez <javier.gonz@samsung.com>,
	Maxim Levitsky <mlevitsk@redhat.com>
Subject: Re: [PATCH v2 17/18] hw/block/nvme: provide the mandatory subnqn field
Date: Fri, 3 Jul 2020 10:18:13 +0200	[thread overview]
Message-ID: <73b19cd0-f52c-d61c-79b0-14f4d985aea6@redhat.com> (raw)
In-Reply-To: <20200703063420.2241014-18-its@irrelevant.dk>

On 7/3/20 8:34 AM, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> The SUBNQN field is mandatory in NVM Express 1.3.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
> Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
> ---
>  hw/block/nvme.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 8138baa6fbd8..5bbb6aa0efc3 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -2134,6 +2134,9 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice *pci_dev)
>      id->oncs = cpu_to_le16(NVME_ONCS_WRITE_ZEROS | NVME_ONCS_TIMESTAMP |
>                             NVME_ONCS_FEATURES);
>  
> +    pstrcpy((char *) id->subnqn, sizeof(id->subnqn), "nqn.2019-08.org.qemu:");
> +    pstrcat((char *) id->subnqn, sizeof(id->subnqn), n->params.serial);

What about using strpadcpy()?

  char *subnqn = g_strdup_printf("nqn.2019-08.org.qemu:%s",
                                 n->params.serial);
  strpadcpy((char *)id->subnqn, sizeof(id->subnqn), subnqn, '\0');
  g_free(subnqn);

> +
>      id->psd[0].mp = cpu_to_le16(0x9c4);
>      id->psd[0].enlat = cpu_to_le32(0x10);
>      id->psd[0].exlat = cpu_to_le32(0x4);
> 