linux-kernel - Re: [PATCH] add Intel 760p/Pro 7600p nvme disk

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Date:   Thu, 2 Dec 2021 09:55:39 -0800
From:   Keith Busch <kbusch@...nel.org>
To:     caojun <caojun@...ontech.com>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] add Intel 760p/Pro 7600p nvme disk

On Thu, Dec 02, 2021 at 11:02:30AM +0800, caojun wrote:
> Signed-off-by: caojun <caojun@...ontech.com>

What is the purpose of this patch? All of this code already exists from
3 years ago.

> ---
>  drivers/nvme/host/core.c | 16 +++++++++-------
>  drivers/nvme/host/nvme.h |  5 +++++
>  drivers/nvme/host/pci.c  |  2 ++
>  3 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index e64310f22..8e0dbfb6a 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -2155,14 +2155,16 @@ static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ct
>  	size_t nqnlen;
>  	int off;
>  
> -	nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
> -	if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
> -		strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
> -		return;
> -	}
> +	if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
> +		nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
> +		if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
> +			strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
> +			return;
> +		}
>  
> -	if (ctrl->vs >= NVME_VS(1, 2, 1))
> -		dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
> +		if (ctrl->vs >= NVME_VS(1, 2, 1))
> +			dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
> +	}
>  
>  	/* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
>  	off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index 276975506..5f5a91518 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -90,6 +90,11 @@ enum nvme_quirks {
>  	 * Set MEDIUM priority on SQ creation
>  	 */
>  	NVME_QUIRK_MEDIUM_PRIO_SQ		= (1 << 7),
> +
> +	/*
> +	 * Ignore device provided subnqn.
> +	 */
> +	NVME_QUIRK_IGNORE_DEV_SUBNQN		= (1 << 8),
>  };
>  
>  /*
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index d7cf3202c..fcac05528 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2713,6 +2713,8 @@ static const struct pci_device_id nvme_id_table[] = {
>  	{ PCI_VDEVICE(INTEL, 0xf1a5),	/* Intel 600P/P3100 */
>  		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
>  				NVME_QUIRK_MEDIUM_PRIO_SQ },
> +	{ PCI_VDEVICE(INTEL, 0xf1a6),	/* Intel 760p/Pro 7600p */
> +		.driver_data = NVME_QUIRK_IGNORE_DEV_SUBNQN, },
>  	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
>  		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
>  	{ PCI_DEVICE(0x1bb1, 0x0100),   /* Seagate Nytro Flash Storage */
> -- 
> 2.20.1
> 
> 
> 
>