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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2020 Hewlett Packard Enterprise, Inc. All rights reserved.
*/
#include "rxe.h"
int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata)
{
struct rxe_mw *mw = to_rmw(ibmw);
struct rxe_pd *pd = to_rpd(ibmw->pd);
struct rxe_dev *rxe = to_rdev(ibmw->device);
int ret;
rxe_add_ref(pd);
ret = rxe_add_to_pool(&rxe->mw_pool, mw);
if (ret) {
rxe_drop_ref(pd);
return ret;
}
rxe_add_index(mw);
mw->rkey = ibmw->rkey = (mw->pelem.index << 8) | rxe_get_next_key(-1);
mw->state = (mw->ibmw.type == IB_MW_TYPE_2) ?
RXE_MW_STATE_FREE : RXE_MW_STATE_VALID;
spin_lock_init(&mw->lock);
return 0;
}
static void rxe_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);
struct rxe_pd *pd = to_rpd(ibmw->pd);
spin_lock_bh(&mw->lock);
rxe_do_dealloc_mw(mw);
spin_unlock_bh(&mw->lock);
rxe_drop_ref(mw);
rxe_drop_ref(pd);
return 0;
}
static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
struct rxe_mw *mw, struct rxe_mr *mr)
{
u32 key = wqe->wr.wr.mw.rkey & 0xff;
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(key == (mw->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->cur_map_set->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->cur_map_set->iova) ||
((wqe->wr.wr.mw.addr + wqe->wr.wr.mw.length) >
(mr->cur_map_set->iova + mr->cur_map_set->length)))) {
pr_err_once(
"attempt to bind a VA MW outside of the MR\n");
return -EINVAL;
}
}
return 0;
}
static void rxe_do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
struct rxe_mw *mw, struct rxe_mr *mr)
{
u32 key = wqe->wr.wr.mw.rkey & 0xff;
mw->rkey = (mw->rkey & ~0xff) | key;
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);
u32 mw_rkey = wqe->wr.wr.mw.mw_rkey;
u32 mr_lkey = wqe->wr.wr.mw.mr_lkey;
mw = rxe_pool_get_index(&rxe->mw_pool, mw_rkey >> 8);
if (unlikely(!mw)) {
ret = -EINVAL;
goto err;
}
if (unlikely(mw->rkey != mw_rkey)) {
ret = -EINVAL;
goto err_drop_mw;
}
if (likely(wqe->wr.wr.mw.length)) {
mr = rxe_pool_get_index(&rxe->mr_pool, mr_lkey >> 8);
if (unlikely(!mr)) {
ret = -EINVAL;
goto err_drop_mw;
}
if (unlikely(mr->lkey != mr_lkey)) {
ret = -EINVAL;
goto err_drop_mr;
}
} else {
mr = NULL;
}
spin_lock_bh(&mw->lock);
ret = rxe_check_bind_mw(qp, wqe, mw, mr);
if (ret)
goto err_unlock;
rxe_do_bind_mw(qp, wqe, mw, mr);
err_unlock:
spin_unlock_bh(&mw->lock);
err_drop_mr:
if (mr)
rxe_drop_ref(mr);
err_drop_mw:
rxe_drop_ref(mw);
err:
return ret;
}
static int rxe_check_invalidate_mw(struct rxe_qp *qp, struct rxe_mw *mw)
{
if (unlikely(mw->state == RXE_MW_STATE_INVALID))
return -EINVAL;
/* o10-37.2.26 */
if (unlikely(mw->ibmw.type == IB_MW_TYPE_1))
return -EINVAL;
return 0;
}
static void rxe_do_invalidate_mw(struct rxe_mw *mw)
{
struct rxe_qp *qp;
struct rxe_mr *mr;
/* valid type 2 MW will always have a QP pointer */
qp = mw->qp;
mw->qp = NULL;
rxe_drop_ref(qp);
/* valid type 2 MW will always have an MR pointer */
mr = mw->mr;
mw->mr = NULL;
atomic_dec(&mr->num_mw);
rxe_drop_ref(mr);
mw->access = 0;
mw->addr = 0;
mw->length = 0;
mw->state = RXE_MW_STATE_FREE;
}
int rxe_invalidate_mw(struct rxe_qp *qp, u32 rkey)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_mw *mw;
int ret;
mw = rxe_pool_get_index(&rxe->mw_pool, rkey >> 8);
if (!mw) {
ret = -EINVAL;
goto err;
}
if (rkey != mw->rkey) {
ret = -EINVAL;
goto err_drop_ref;
}
spin_lock_bh(&mw->lock);
ret = rxe_check_invalidate_mw(qp, mw);
if (ret)
goto err_unlock;
rxe_do_invalidate_mw(mw);
err_unlock:
spin_unlock_bh(&mw->lock);
err_drop_ref:
rxe_drop_ref(mw);
err:
return ret;
}
struct rxe_mw *rxe_lookup_mw(struct rxe_qp *qp, int access, u32 rkey)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_pd *pd = to_rpd(qp->ibqp.pd);
struct rxe_mw *mw;
int index = rkey >> 8;
mw = rxe_pool_get_index(&rxe->mw_pool, index);
if (!mw)
return NULL;
if (unlikely((mw->rkey != rkey) || rxe_mw_pd(mw) != pd ||
(mw->ibmw.type == IB_MW_TYPE_2 && mw->qp != qp) ||
(mw->length == 0) ||
(access && !(access & mw->access)) ||
mw->state != RXE_MW_STATE_VALID)) {
rxe_drop_ref(mw);
return NULL;
}
return mw;
}
void rxe_mw_cleanup(struct rxe_pool_entry *elem)
{
struct rxe_mw *mw = container_of(elem, typeof(*mw), pelem);
rxe_drop_index(mw);
}
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