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From: Zhu Yanjun <zyjzyj2000@gmail.com>
To: Bob Pearson <rpearsonhpe@gmail.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	RDMA mailing list <linux-rdma@vger.kernel.org>,
	Bob Pearson <rpearson@hpe.com>
Subject: Re: [PATCH for-next v2 7/9] RDMA/rxe: Add support for bind MW work requests
Date: Tue, 20 Apr 2021 22:32:19 +0800
Message-ID: <CAD=hENf8SA2==WhtufkcesuJH7cMys8vPNj4_1a=OAaE2GREOA@mail.gmail.com> (raw)
In-Reply-To: <20210415025429.11053-8-rpearson@hpe.com>

On Thu, Apr 15, 2021 at 10:55 AM Bob Pearson <rpearsonhpe@gmail.com> wrote:
>
> Add support for bind MW work requests from user space.
> Since rdma/core does not support bind mw in ib_send_wr
> there is no way to support bind mw in kernel space.
>
> Added bind_mw local operation in rxe_req.c
> Added bind_mw WR operation in rxe_opcode.c
> Added bind_mw WC in rxe_comp.c
> Added additional fields to rxe_mw in rxe_verbs.h
> Added do_dealloc_mw() subroutine to cleanup an mw
> when rxe_dealloc_mw is called.
> Added code to implement bind_mw operation in rxe_mw.c
>
> Signed-off-by: Bob Pearson <rpearson@hpe.com>
> ---
> v2:
>   Dropped kernel support for bind_mw in rxe_mw.c
>   Replaced umw with mw in rxe_send_wr.
>
>  drivers/infiniband/sw/rxe/rxe_comp.c   |   1 +
>  drivers/infiniband/sw/rxe/rxe_loc.h    |   1 +
>  drivers/infiniband/sw/rxe/rxe_mw.c     | 204 ++++++++++++++++++++++++-
>  drivers/infiniband/sw/rxe/rxe_opcode.c |   7 +
>  drivers/infiniband/sw/rxe/rxe_req.c    |   9 ++
>  drivers/infiniband/sw/rxe/rxe_verbs.h  |  15 +-
>  6 files changed, 232 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c
> index 2af26737d32d..bc5488af5f55 100644
> --- a/drivers/infiniband/sw/rxe/rxe_comp.c
> +++ b/drivers/infiniband/sw/rxe/rxe_comp.c
> @@ -103,6 +103,7 @@ static enum ib_wc_opcode wr_to_wc_opcode(enum ib_wr_opcode opcode)
>         case IB_WR_RDMA_READ_WITH_INV:          return IB_WC_RDMA_READ;
>         case IB_WR_LOCAL_INV:                   return IB_WC_LOCAL_INV;
>         case IB_WR_REG_MR:                      return IB_WC_REG_MR;
> +       case IB_WR_BIND_MW:                     return IB_WC_BIND_MW;
>
>         default:
>                 return 0xff;
> diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
> index edf575930a98..e6f574973298 100644
> --- a/drivers/infiniband/sw/rxe/rxe_loc.h
> +++ b/drivers/infiniband/sw/rxe/rxe_loc.h
> @@ -110,6 +110,7 @@ int advance_dma_data(struct rxe_dma_info *dma, unsigned int length);
>  /* rxe_mw.c */
>  int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata);
>  int rxe_dealloc_mw(struct ib_mw *ibmw);
> +int rxe_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe);
>  void rxe_mw_cleanup(struct rxe_pool_entry *arg);
>
>  /* rxe_net.c */
> diff --git a/drivers/infiniband/sw/rxe/rxe_mw.c b/drivers/infiniband/sw/rxe/rxe_mw.c
> index 69128e298d44..6ced54126b72 100644
> --- a/drivers/infiniband/sw/rxe/rxe_mw.c
> +++ b/drivers/infiniband/sw/rxe/rxe_mw.c
> @@ -29,6 +29,29 @@ int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata)
>         return 0;
>  }
>
> +static void do_dealloc_mw(struct rxe_mw *mw)
> +{
> +       if (mw->mr) {
> +               struct rxe_mr *mr = mw->mr;
> +
> +               mw->mr = NULL;
> +               atomic_dec(&mr->num_mw);
> +               rxe_drop_ref(mr);
> +       }
> +
> +       if (mw->qp) {
> +               struct rxe_qp *qp = mw->qp;
> +
> +               mw->qp = NULL;
> +               rxe_drop_ref(qp);
> +       }
> +
> +       mw->access = 0;
> +       mw->addr = 0;
> +       mw->length = 0;
> +       mw->state = RXE_MW_STATE_INVALID;
> +}
> +
>  int rxe_dealloc_mw(struct ib_mw *ibmw)
>  {
>         struct rxe_mw *mw = to_rmw(ibmw);
> @@ -36,7 +59,7 @@ int rxe_dealloc_mw(struct ib_mw *ibmw)
>         unsigned long flags;
>
>         spin_lock_irqsave(&mw->lock, flags);
> -       mw->state = RXE_MW_STATE_INVALID;
> +       do_dealloc_mw(mw);
>         spin_unlock_irqrestore(&mw->lock, flags);
>
>         rxe_drop_ref(mw);
> @@ -45,6 +68,185 @@ int rxe_dealloc_mw(struct ib_mw *ibmw)
>         return 0;
>  }
>
> +static int check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
> +                        struct rxe_mw *mw, struct rxe_mr *mr)
> +{
> +       if (mw->ibmw.type == IB_MW_TYPE_1) {
> +               if (unlikely(mw->state != RXE_MW_STATE_VALID)) {
> +                       pr_err_once(
> +                               "attempt to bind a type 1 MW not in the valid state\n");
> +                       return -EINVAL;
> +               }
> +
> +               /* o10-36.2.2 */
> +               if (unlikely((mw->access & IB_ZERO_BASED))) {
> +                       pr_err_once("attempt to bind a zero based type 1 MW\n");
> +                       return -EINVAL;
> +               }
> +       }
> +
> +       if (mw->ibmw.type == IB_MW_TYPE_2) {
> +               /* o10-37.2.30 */
> +               if (unlikely(mw->state != RXE_MW_STATE_FREE)) {
> +                       pr_err_once(
> +                               "attempt to bind a type 2 MW not in the free state\n");
> +                       return -EINVAL;
> +               }
> +
> +               /* C10-72 */
> +               if (unlikely(qp->pd != to_rpd(mw->ibmw.pd))) {
> +                       pr_err_once(
> +                               "attempt to bind type 2 MW with qp with different PD\n");
> +                       return -EINVAL;
> +               }
> +
> +               /* o10-37.2.40 */
> +               if (unlikely(!mr || wqe->wr.wr.mw.length == 0)) {
> +                       pr_err_once(
> +                               "attempt to invalidate type 2 MW by binding with NULL or zero length MR\n");
> +                       return -EINVAL;
> +               }
> +       }
> +
> +       if (unlikely((wqe->wr.wr.mw.rkey & 0xff) == (mw->ibmw.rkey & 0xff))) {
> +               pr_err_once("attempt to bind MW with same key\n");
> +               return -EINVAL;
> +       }
> +
> +       /* remaining checks only apply to a nonzero MR */
> +       if (!mr)
> +               return 0;
> +
> +       if (unlikely(mr->access & IB_ZERO_BASED)) {
> +               pr_err_once("attempt to bind MW to zero based MR\n");
> +               return -EINVAL;
> +       }
> +
> +       /* C10-73 */
> +       if (unlikely(!(mr->access & IB_ACCESS_MW_BIND))) {
> +               pr_err_once(
> +                       "attempt to bind an MW to an MR without bind access\n");
> +               return -EINVAL;
> +       }
> +
> +       /* C10-74 */
> +       if (unlikely((mw->access &
> +                     (IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC)) &&
> +                    !(mr->access & IB_ACCESS_LOCAL_WRITE))) {
> +               pr_err_once(
> +                       "attempt to bind an writeable MW to an MR without local write access\n");
> +               return -EINVAL;
> +       }
> +
> +       /* C10-75 */
> +       if (mw->access & IB_ZERO_BASED) {
> +               if (unlikely(wqe->wr.wr.mw.length > mr->length)) {
> +                       pr_err_once(
> +                               "attempt to bind a ZB MW outside of the MR\n");
> +                       return -EINVAL;
> +               }
> +       } else {
> +               if (unlikely((wqe->wr.wr.mw.addr < mr->iova) ||
> +                            ((wqe->wr.wr.mw.addr + wqe->wr.wr.mw.length) >
> +                             (mr->iova + mr->length)))) {
> +                       pr_err_once(
> +                               "attempt to bind a VA MW outside of the MR\n");
> +                       return -EINVAL;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static int do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
> +                     struct rxe_mw *mw, struct rxe_mr *mr)
> +{
> +       u32 rkey;
> +       u32 new_rkey;
> +
> +       rkey = mw->ibmw.rkey;
> +       new_rkey = (rkey & 0xffffff00) | (wqe->wr.wr.mw.rkey & 0x000000ff);
> +
> +       mw->ibmw.rkey = new_rkey;
> +       mw->access = wqe->wr.wr.mw.access;
> +       mw->state = RXE_MW_STATE_VALID;
> +       mw->addr = wqe->wr.wr.mw.addr;
> +       mw->length = wqe->wr.wr.mw.length;
> +
> +       if (mw->mr) {
> +               rxe_drop_ref(mw->mr);
> +               atomic_dec(&mw->mr->num_mw);
> +               mw->mr = NULL;
> +       }
> +
> +       if (mw->length) {
> +               mw->mr = mr;
> +               atomic_inc(&mr->num_mw);
> +               rxe_add_ref(mr);
> +       }
> +
> +       if (mw->ibmw.type == IB_MW_TYPE_2) {
> +               rxe_add_ref(qp);
> +               mw->qp = qp;
> +       }
> +
> +       return 0;

Is it necessary to return 0?

no others invalid value.

Zhu Yanjun
> +}
> +
> +int rxe_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
> +{
> +       int ret;
> +       struct rxe_mw *mw;
> +       struct rxe_mr *mr;
> +       struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
> +       unsigned long flags;
> +
> +       mw = rxe_pool_get_index(&rxe->mw_pool,
> +                               wqe->wr.wr.mw.mw_rkey >> 8);
> +       if (unlikely(!mw)) {
> +               ret = -EINVAL;
> +               goto err;
> +       }
> +
> +       if (unlikely(mw->ibmw.rkey != wqe->wr.wr.mw.mw_rkey)) {
> +               ret = -EINVAL;
> +               goto err_drop_mw;
> +       }
> +
> +       if (likely(wqe->wr.wr.mw.length)) {
> +               mr = rxe_pool_get_index(&rxe->mr_pool,
> +                                       wqe->wr.wr.mw.mr_lkey >> 8);
> +               if (unlikely(!mr)) {
> +                       ret = -EINVAL;
> +                       goto err_drop_mw;
> +               }
> +
> +               if (unlikely(mr->ibmr.lkey != wqe->wr.wr.mw.mr_lkey)) {
> +                       ret = -EINVAL;
> +                       goto err_drop_mr;
> +               }
> +       } else {
> +               mr = NULL;
> +       }
> +
> +       spin_lock_irqsave(&mw->lock, flags);
> +
> +       ret = check_bind_mw(qp, wqe, mw, mr);
> +       if (ret)
> +               goto err_unlock;
> +
> +       ret = do_bind_mw(qp, wqe, mw, mr);
> +err_unlock:
> +       spin_unlock_irqrestore(&mw->lock, flags);
> +err_drop_mr:
> +       if (mr)
> +               rxe_drop_ref(mr);
> +err_drop_mw:
> +       rxe_drop_ref(mw);
> +err:
> +       return ret;
> +}
> +
>  void rxe_mw_cleanup(struct rxe_pool_entry *elem)
>  {
>         struct rxe_mw *mw = container_of(elem, typeof(*mw), pelem);
> diff --git a/drivers/infiniband/sw/rxe/rxe_opcode.c b/drivers/infiniband/sw/rxe/rxe_opcode.c
> index 1e4b67b048f3..3ef5a10a6efd 100644
> --- a/drivers/infiniband/sw/rxe/rxe_opcode.c
> +++ b/drivers/infiniband/sw/rxe/rxe_opcode.c
> @@ -96,6 +96,13 @@ struct rxe_wr_opcode_info rxe_wr_opcode_info[] = {
>                         [IB_QPT_RC]     = WR_LOCAL_OP_MASK,
>                 },
>         },
> +       [IB_WR_BIND_MW]                                 = {
> +               .name   = "IB_WR_BIND_MW",
> +               .mask   = {
> +                       [IB_QPT_RC]     = WR_LOCAL_OP_MASK,
> +                       [IB_QPT_UC]     = WR_LOCAL_OP_MASK,
> +               },
> +       },
>  };
>
>  struct rxe_opcode_info rxe_opcode[RXE_NUM_OPCODE] = {
> diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c
> index 0cf97e3db29f..243602584a28 100644
> --- a/drivers/infiniband/sw/rxe/rxe_req.c
> +++ b/drivers/infiniband/sw/rxe/rxe_req.c
> @@ -561,6 +561,7 @@ static int do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
>         struct rxe_dev *rxe;
>         struct rxe_mr *mr;
>         u32 rkey;
> +       int ret;
>
>         switch (opcode) {
>         case IB_WR_LOCAL_INV:
> @@ -587,6 +588,14 @@ static int do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
>                 mr->iova = wqe->wr.wr.reg.mr->iova;
>                 rxe_drop_ref(mr);
>                 break;
> +       case IB_WR_BIND_MW:
> +               ret = rxe_bind_mw(qp, wqe);
> +               if (ret) {
> +                       wqe->state = wqe_state_error;
> +                       wqe->status = IB_WC_MW_BIND_ERR;
> +                       return -EINVAL;
> +               }
> +               break;
>         default:
>                 pr_err("Unexpected send wqe opcode %d\n", opcode);
>                 wqe->state = wqe_state_error;
> diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h
> index c8597ae8c833..7da47b8c707b 100644
> --- a/drivers/infiniband/sw/rxe/rxe_verbs.h
> +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
> @@ -312,6 +312,8 @@ struct rxe_mr {
>         u32                     num_map;
>
>         struct rxe_map          **map;
> +
> +       atomic_t                num_mw;
>  };
>
>  enum rxe_mw_state {
> @@ -321,10 +323,15 @@ enum rxe_mw_state {
>  };
>
>  struct rxe_mw {
> -       struct ib_mw ibmw;
> -       struct rxe_pool_entry pelem;
> -       spinlock_t lock;
> -       enum rxe_mw_state state;
> +       struct                  ib_mw ibmw;
> +       struct                  rxe_pool_entry pelem;
> +       spinlock_t              lock;
> +       enum rxe_mw_state       state;
> +       struct rxe_qp           *qp;    /* Type 2 only */
> +       struct rxe_mr           *mr;
> +       int                     access;
> +       u64                     addr;
> +       u64                     length;
>  };
>
>  struct rxe_mc_grp {
> --
> 2.27.0
>

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15  2:54 [PATCH for-next v2 0/9] RDMA/rxe: Implement memory windows Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 1/9] RDMA/rxe: Add bind MW fields to rxe_send_wr Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 2/9] RDMA/rxe: Return errors for add index and key Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 3/9] RDMA/rxe: Enable MW object pool Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 4/9] RDMA/rxe: Add ib_alloc_mw and ib_dealloc_mw verbs Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 5/9] RDMA/rxe: Replace WR_REG_MASK by WR_LOCAL_OP_MASK Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 6/9] RDMA/rxe: Move local ops to subroutine Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 7/9] RDMA/rxe: Add support for bind MW work requests Bob Pearson
2021-04-20 14:32   ` Zhu Yanjun [this message]
2021-04-21  4:24     ` Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 8/9] RDMA/rxe: Implement invalidate MW operations Bob Pearson
2021-04-20  6:38   ` Zhu Yanjun
2021-04-21  4:22     ` Bob Pearson
2021-04-15  2:54 ` [PATCH for-next v2 9/9] RDMA/rxe: Implement memory access through MWs Bob Pearson
2021-04-20  6:34   ` Zhu Yanjun
2021-04-20 12:04     ` Jason Gunthorpe
2021-04-21  4:09       ` Bob Pearson

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