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Date: Sat, 2 Mar 2024 06:34:34 +0100
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>,
kotaranov@...rosoft.com, sharmaajay@...rosoft.com, longli@...rosoft.com,
jgg@...pe.ca, leon@...nel.org
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH rdma-next v2 2/2] RDMA/mana_ib: Use virtual address in dma
regions for MRs
在 2024/2/26 8:25, Konstantin Taranov 写道:
> From: Konstantin Taranov <kotaranov@...rosoft.com>
>
> Introduce mana_ib_create_dma_region() to create dma regions with iova
> for MRs.
>
> For dma regions that must have a zero dma offset (e.g., for queues),
> mana_ib_create_zero_offset_dma_region() is added.
> To get the zero offset, ib_umem_find_best_pgoff() is used with zero
> pgoff_bitmask.
>
> Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
> ---
> drivers/infiniband/hw/mana/cq.c | 4 +--
> drivers/infiniband/hw/mana/main.c | 40 +++++++++++++++++++++-------
> drivers/infiniband/hw/mana/mana_ib.h | 7 +++--
> drivers/infiniband/hw/mana/mr.c | 4 +--
> drivers/infiniband/hw/mana/qp.c | 6 ++---
> drivers/infiniband/hw/mana/wq.c | 4 +--
> 6 files changed, 45 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/infiniband/hw/mana/cq.c b/drivers/infiniband/hw/mana/cq.c
> index 83d20c3f0..4a71e678d 100644
> --- a/drivers/infiniband/hw/mana/cq.c
> +++ b/drivers/infiniband/hw/mana/cq.c
> @@ -48,7 +48,7 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
> return err;
> }
>
> - err = mana_ib_gd_create_dma_region(mdev, cq->umem, &cq->gdma_region);
> + err = mana_ib_create_zero_offset_dma_region(mdev, cq->umem, &cq->gdma_region);
> if (err) {
> ibdev_dbg(ibdev,
> "Failed to create dma region for create cq, %d\n",
> @@ -57,7 +57,7 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
> }
>
> ibdev_dbg(ibdev,
> - "mana_ib_gd_create_dma_region ret %d gdma_region 0x%llx\n",
> + "create_dma_region ret %d gdma_region 0x%llx\n",
> err, cq->gdma_region);
>
> /*
> diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
> index dd570832d..30b874938 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -301,8 +301,8 @@ mana_ib_gd_add_dma_region(struct mana_ib_dev *dev, struct gdma_context *gc,
> return 0;
> }
>
> -int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> - mana_handle_t *gdma_region)
> +static int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> + mana_handle_t *gdma_region, unsigned long page_sz)
> {
> struct gdma_dma_region_add_pages_req *add_req = NULL;
> size_t num_pages_processed = 0, num_pages_to_handle;
> @@ -314,7 +314,6 @@ int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> size_t max_pgs_create_cmd;
> struct gdma_context *gc;
> size_t num_pages_total;
> - unsigned long page_sz;
> unsigned int tail = 0;
> u64 *page_addr_list;
> void *request_buf;
> @@ -323,12 +322,6 @@ int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> gc = mdev_to_gc(dev);
> hwc = gc->hwc.driver_data;
>
> - /* Hardware requires dma region to align to chosen page size */
> - page_sz = ib_umem_find_best_pgsz(umem, PAGE_SZ_BM, 0);
> - if (!page_sz) {
> - ibdev_dbg(&dev->ib_dev, "failed to find page size.\n");
> - return -ENOMEM;
> - }
> num_pages_total = ib_umem_num_dma_blocks(umem, page_sz);
>
> max_pgs_create_cmd =
> @@ -414,6 +407,35 @@ int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> return err;
> }
>
> +int mana_ib_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> + mana_handle_t *gdma_region, u64 virt)
> +{
> + unsigned long page_sz;
> +
> + page_sz = ib_umem_find_best_pgsz(umem, PAGE_SZ_BM, virt);
> + if (!page_sz) {
> + ibdev_dbg(&dev->ib_dev, "Failed to find page size.\n");
> + return -EINVAL;
<...>
> + }
> +
> + return mana_ib_gd_create_dma_region(dev, umem, gdma_region, page_sz);
> +}
> +
> +int mana_ib_create_zero_offset_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> + mana_handle_t *gdma_region)
> +{
> + unsigned long page_sz;
> +
> + /* Hardware requires dma region to align to chosen page size */
> + page_sz = ib_umem_find_best_pgoff(umem, PAGE_SZ_BM, 0);
> + if (!page_sz) {
> + ibdev_dbg(&dev->ib_dev, "Failed to find page size.\n");
> + return -ENOMEM;
> + }
A trivial problem.
The function ib_umem_find_best_pgoff is a wraper of the function
ib_umem_find_best_pgsz. In the above function mana_ib_create_dma_region,
when the function ib_umem_find_best_pgsz fails, the error is -EINVAL. In
this function mana_ib_create_zero_offset_dma_region, when
ib_umem_find_best_pgoff fails (actually ib_umem_find_best_pgsz fails),
error should also be -EINVAL?
This function ib_umem_find_best_pgsz is intended for HW that support
multiple page sizes but can do only a single page size in an MR.
Returns 0 if the umem requires page sizes not supported by the driver to
be mapped. Drivers always supporting PAGE_SIZE or smaller will never see
a 0 result.
So the above "return -ENOMEM;" should be "return -EINVAL;"?
Zhu Yanjun
> +
> + return mana_ib_gd_create_dma_region(dev, umem, gdma_region, page_sz);
> +}
> +
> int mana_ib_gd_destroy_dma_region(struct mana_ib_dev *dev, u64 gdma_region)
> {
> struct gdma_context *gc = mdev_to_gc(dev);
> diff --git a/drivers/infiniband/hw/mana/mana_ib.h b/drivers/infiniband/hw/mana/mana_ib.h
> index 6a03ae645..f83390eeb 100644
> --- a/drivers/infiniband/hw/mana/mana_ib.h
> +++ b/drivers/infiniband/hw/mana/mana_ib.h
> @@ -160,8 +160,11 @@ static inline struct net_device *mana_ib_get_netdev(struct ib_device *ibdev, u32
>
> int mana_ib_install_cq_cb(struct mana_ib_dev *mdev, struct mana_ib_cq *cq);
>
> -int mana_ib_gd_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> - mana_handle_t *gdma_region);
> +int mana_ib_create_zero_offset_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> + mana_handle_t *gdma_region);
> +
> +int mana_ib_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
> + mana_handle_t *gdma_region, u64 virt);
>
> int mana_ib_gd_destroy_dma_region(struct mana_ib_dev *dev,
> mana_handle_t gdma_region);
> diff --git a/drivers/infiniband/hw/mana/mr.c b/drivers/infiniband/hw/mana/mr.c
> index ee4d4f834..b70b13484 100644
> --- a/drivers/infiniband/hw/mana/mr.c
> +++ b/drivers/infiniband/hw/mana/mr.c
> @@ -127,7 +127,7 @@ struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length,
> goto err_free;
> }
>
> - err = mana_ib_gd_create_dma_region(dev, mr->umem, &dma_region_handle);
> + err = mana_ib_create_dma_region(dev, mr->umem, &dma_region_handle, iova);
> if (err) {
> ibdev_dbg(ibdev, "Failed create dma region for user-mr, %d\n",
> err);
> @@ -135,7 +135,7 @@ struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length,
> }
>
> ibdev_dbg(ibdev,
> - "mana_ib_gd_create_dma_region ret %d gdma_region %llx\n", err,
> + "create_dma_region ret %d gdma_region %llx\n", err,
> dma_region_handle);
>
> mr_params.pd_handle = pd->pd_handle;
> diff --git a/drivers/infiniband/hw/mana/qp.c b/drivers/infiniband/hw/mana/qp.c
> index 5d4c05dcd..6e7627745 100644
> --- a/drivers/infiniband/hw/mana/qp.c
> +++ b/drivers/infiniband/hw/mana/qp.c
> @@ -357,8 +357,8 @@ static int mana_ib_create_qp_raw(struct ib_qp *ibqp, struct ib_pd *ibpd,
> }
> qp->sq_umem = umem;
>
> - err = mana_ib_gd_create_dma_region(mdev, qp->sq_umem,
> - &qp->sq_gdma_region);
> + err = mana_ib_create_zero_offset_dma_region(mdev, qp->sq_umem,
> + &qp->sq_gdma_region);
> if (err) {
> ibdev_dbg(&mdev->ib_dev,
> "Failed to create dma region for create qp-raw, %d\n",
> @@ -367,7 +367,7 @@ static int mana_ib_create_qp_raw(struct ib_qp *ibqp, struct ib_pd *ibpd,
> }
>
> ibdev_dbg(&mdev->ib_dev,
> - "mana_ib_gd_create_dma_region ret %d gdma_region 0x%llx\n",
> + "create_dma_region ret %d gdma_region 0x%llx\n",
> err, qp->sq_gdma_region);
>
> /* Create a WQ on the same port handle used by the Ethernet */
> diff --git a/drivers/infiniband/hw/mana/wq.c b/drivers/infiniband/hw/mana/wq.c
> index 372d36151..7c9c69962 100644
> --- a/drivers/infiniband/hw/mana/wq.c
> +++ b/drivers/infiniband/hw/mana/wq.c
> @@ -46,7 +46,7 @@ struct ib_wq *mana_ib_create_wq(struct ib_pd *pd,
> wq->wq_buf_size = ucmd.wq_buf_size;
> wq->rx_object = INVALID_MANA_HANDLE;
>
> - err = mana_ib_gd_create_dma_region(mdev, wq->umem, &wq->gdma_region);
> + err = mana_ib_create_zero_offset_dma_region(mdev, wq->umem, &wq->gdma_region);
> if (err) {
> ibdev_dbg(&mdev->ib_dev,
> "Failed to create dma region for create wq, %d\n",
> @@ -55,7 +55,7 @@ struct ib_wq *mana_ib_create_wq(struct ib_pd *pd,
> }
>
> ibdev_dbg(&mdev->ib_dev,
> - "mana_ib_gd_create_dma_region ret %d gdma_region 0x%llx\n",
> + "create_dma_region ret %d gdma_region 0x%llx\n",
> err, wq->gdma_region);
>
> /* WQ ID is returned at wq_create time, doesn't know the value yet */
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