linux-kernel - Re: [PATCH v4 11/23] nvme-pci: convert to using dma_map

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Date:   Mon, 13 Dec 2021 15:28:54 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Chaitanya Kulkarni <chaitanyak@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jakowski Andrzej <andrzej.jakowski@...el.com>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: Re: [PATCH v4 11/23] nvme-pci: convert to using dma_map_sgtable()


On 2021-12-13 3:21 p.m., Chaitanya Kulkarni wrote:
> 
>>   static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev,
>> -		struct request *req, struct nvme_rw_command *cmd, int entries)
>> +		struct request *req, struct nvme_rw_command *cmd)
>>   {
>>   	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
>>   	struct dma_pool *pool;
>>   	struct nvme_sgl_desc *sg_list;
>> -	struct scatterlist *sg = iod->sg;
>> +	struct scatterlist *sg = iod->sgt.sgl;
>> +	int entries = iod->sgt.nents;
> 
> I don't see use of newly added entries variable anywhere in
> nvme_pci_setup_sgls(), what am I missing ?

'entries' is being moved out from the argument list of
nvme_pci_setup_sgls(), so there are already uses in the function that
don't show in the diff.

> Also, type of entries variable should be unsigned int to match
> the iod->sgt.nents.

Sure, I will fix that in the next version.

Thanks for the reviews!

Logan