Re: [PATCH for-rc 5/9] RDMA/hns: Fix missing pagesize and alignment check in FRMR

[Leon Romanovsky]

On Mon, Jul 08, 2024 at 10:44:52AM +0800, Junxian Huang wrote:
> 
> 
> On 2024/7/7 17:16, Zhu Yanjun wrote:
> > 在 2024/7/5 16:59, Junxian Huang 写道:
> >> From: Chengchang Tang <tangchengchang@xxxxxxxxxx>
> >>
> >> The offset requires 128B alignment and the page size ranges from
> >> 4K to 128M.
> >>
> >> Fixes: 68a997c5d28c ("RDMA/hns: Add FRMR support for hip08")
> > 
> > https://patchwork.kernel.org/project/linux-rdma/patch/2eee7e35-504e-4f2a-a364-527e90669108@xxxxxxxxxxxxxxxxxxxxxxxx/
> > In the above link, from Bart, it seems that FRMR is renamed to FRWR.
> > "
> > There are already a few drivers upstream in which the fast register
> > memory region work request is abbreviated as FRWR. Please consider
> > renaming FRMR into FRWR in order to avoid confusion and in order to
> > make it easier to find related code with grep in the kernel tree.
> > "
> > 
> > So is it possible to rename FRMR to FRWR?
> > 
> 
> I think the rename is irrelevant to this bugfix, and if it needs to be done,
> we'll need a single patch to rename all existing 'FRMR' in hns driver.
> 
> So let's leave it as is for now.

+1

> 
> Thanks,
> Junxian
> 
> >> Signed-off-by: Chengchang Tang <tangchengchang@xxxxxxxxxx>
> >> Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
> >> ---
> >>   drivers/infiniband/hw/hns/hns_roce_device.h | 4 ++++
> >>   drivers/infiniband/hw/hns/hns_roce_mr.c     | 5 +++++
> >>   2 files changed, 9 insertions(+)
> >>
> >> diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
> >> index 5a2445f357ab..15b3b978a601 100644
> >> --- a/drivers/infiniband/hw/hns/hns_roce_device.h
> >> +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
> >> @@ -83,6 +83,7 @@
> >>   #define MR_TYPE_DMA                0x03
> >>     #define HNS_ROCE_FRMR_MAX_PA            512
> >> +#define HNS_ROCE_FRMR_ALIGN_SIZE        128
> >>     #define PKEY_ID                    0xffff
> >>   #define NODE_DESC_SIZE                64
> >> @@ -189,6 +190,9 @@ enum {
> >>   #define HNS_HW_PAGE_SHIFT            12
> >>   #define HNS_HW_PAGE_SIZE            (1 << HNS_HW_PAGE_SHIFT)
> >>   +#define HNS_HW_MAX_PAGE_SHIFT            27
> >> +#define HNS_HW_MAX_PAGE_SIZE            (1 << HNS_HW_MAX_PAGE_SHIFT)
> >> +
> >>   struct hns_roce_uar {
> >>       u64        pfn;
> >>       unsigned long    index;
> >> diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
> >> index 1a61dceb3319..846da8c78b8b 100644
> >> --- a/drivers/infiniband/hw/hns/hns_roce_mr.c
> >> +++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
> >> @@ -443,6 +443,11 @@ int hns_roce_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
> >>       struct hns_roce_mtr *mtr = &mr->pbl_mtr;
> >>       int ret, sg_num = 0;
> >>   +    if (!IS_ALIGNED(*sg_offset, HNS_ROCE_FRMR_ALIGN_SIZE) ||
> >> +        ibmr->page_size < HNS_HW_PAGE_SIZE ||
> >> +        ibmr->page_size > HNS_HW_MAX_PAGE_SIZE)
> >> +        return sg_num;
> >> +
> >>       mr->npages = 0;
> >>       mr->page_list = kvcalloc(mr->pbl_mtr.hem_cfg.buf_pg_count,
> >>                    sizeof(dma_addr_t), GFP_KERNEL);
> >