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

Bob Pearson
2021-04-22T16:13:53Z

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)
+{
+ 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,
+ 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,
+ 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