Re: [PATCH for-next v5 07/10] RDMA/rxe: Add support for bind MW work requests

Zhu Yanjun
2021-04-25T04:29:58Z

On Fri, Apr 23, 2021 at 12:13 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>
> ---
> v3:
> do_bind_mw() in rxe_mw.c is changed to be a void instead of
> returning an int.
> v2:
> Dropped kernel support for bind_mw in rxe_mw.c
> Replaced umw with mw in struct 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 | 202 ++++++++++++++++++++++++-
> 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, 230 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..c018e8865876 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)

rxe_do_dealloc_mw if it is not used out of softroce.

> +{
> + 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 +68,183 @@ int rxe_dealloc_mw(struct ib_mw *ibmw)
> return 0;
> }
>
> +static int check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,

rxe_check_bind_mw

> + 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 void do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,

rxe_do_bind_mw

> + 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;
> + }
> +}
> +
> +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;
> +
> + 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
>