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RDMA/rxe: Revert changes from irqsave to bh locks

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A previous patch replaced all irqsave locks in rxe with bh locks.  This
ran into problems because rdmacm has a bad habit of calling rdma verbs
APIs while disabling irqs. This is not allowed during spin_unlock_bh()
causing programs that use rdmacm to fail.  This patch reverts the changes
to locks that had this problem or got dragged into the same mess. After
this patch blktests/check -q srp now runs correctly.

Link: https://lore.kernel.org/r/20220215194448.44369-1-rpearsonhpe@gmail.com
Fixes: 21adfa7a3c ("RDMA/rxe: Replace irqsave locks with bh locks")
Reported-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Reported-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bob Pearson 2022-02-15 13:44:49 -06:00 committed by Jason Gunthorpe
parent 3c8bc3954d
commit a099b08599
6 changed files with 69 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/infiniband/sw/rxe/rxe_cq.c
View File

@ -42,13 +42,14 @@ err1:
static void rxe_send_complete(struct tasklet_struct *t)
{
struct rxe_cq *cq = from_tasklet(cq, t, comp_task);
unsigned long flags;
spin_lock_bh(&cq->cq_lock);
spin_lock_irqsave(&cq->cq_lock, flags);
if (cq->is_dying) {
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
return;
}
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
}
@ -107,12 +108,13 @@ int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
struct ib_event ev;
int full;
void *addr;
unsigned long flags;
spin_lock_bh(&cq->cq_lock);
spin_lock_irqsave(&cq->cq_lock, flags);
full = queue_full(cq->queue, QUEUE_TYPE_TO_CLIENT);
if (unlikely(full)) {
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
if (cq->ibcq.event_handler) {
ev.device = cq->ibcq.device;
ev.element.cq = &cq->ibcq;
@ -128,7 +130,7 @@ int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
queue_advance_producer(cq->queue, QUEUE_TYPE_TO_CLIENT);
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
if ((cq->notify == IB_CQ_NEXT_COMP) ||
(cq->notify == IB_CQ_SOLICITED && solicited)) {
@ -141,9 +143,11 @@ int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
void rxe_cq_disable(struct rxe_cq *cq)
{
spin_lock_bh(&cq->cq_lock);
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
cq->is_dying = true;
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
}
void rxe_cq_cleanup(struct rxe_pool_elem *elem)

19
drivers/infiniband/sw/rxe/rxe_mcast.c
View File

@ -58,11 +58,12 @@ static int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
int err;
struct rxe_mcg *grp;
struct rxe_pool *pool = &rxe->mc_grp_pool;
unsigned long flags;
if (rxe->attr.max_mcast_qp_attach == 0)
return -EINVAL;
write_lock_bh(&pool->pool_lock);
write_lock_irqsave(&pool->pool_lock, flags);
grp = rxe_pool_get_key_locked(pool, mgid);
if (grp)
@ -70,13 +71,13 @@ static int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
grp = create_grp(rxe, pool, mgid);
if (IS_ERR(grp)) {
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
err = PTR_ERR(grp);
return err;
}
done:
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
*grp_p = grp;
return 0;
}
@ -86,9 +87,10 @@ static int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
{
int err;
struct rxe_mca *elem;
unsigned long flags;
/* check to see of the qp is already a member of the group */
spin_lock_bh(&grp->mcg_lock);
spin_lock_irqsave(&grp->mcg_lock, flags);
list_for_each_entry(elem, &grp->qp_list, qp_list) {
if (elem->qp == qp) {
err = 0;
@ -118,7 +120,7 @@ static int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
err = 0;
out:
spin_unlock_bh(&grp->mcg_lock);
spin_unlock_irqrestore(&grp->mcg_lock, flags);
return err;
}
@ -127,12 +129,13 @@ static int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
{
struct rxe_mcg *grp;
struct rxe_mca *elem, *tmp;
unsigned long flags;
grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
if (!grp)
goto err1;
spin_lock_bh(&grp->mcg_lock);
spin_lock_irqsave(&grp->mcg_lock, flags);
list_for_each_entry_safe(elem, tmp, &grp->qp_list, qp_list) {
if (elem->qp == qp) {
@ -140,7 +143,7 @@ static int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
grp->num_qp--;
atomic_dec(&qp->mcg_num);
spin_unlock_bh(&grp->mcg_lock);
spin_unlock_irqrestore(&grp->mcg_lock, flags);
rxe_drop_ref(elem);
rxe_drop_ref(grp); /* ref held by QP */
rxe_drop_ref(grp); /* ref from get_key */
@ -148,7 +151,7 @@ static int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
}
}
spin_unlock_bh(&grp->mcg_lock);
spin_unlock_irqrestore(&grp->mcg_lock, flags);
rxe_drop_ref(grp); /* ref from get_key */
err1:
return -EINVAL;

30
drivers/infiniband/sw/rxe/rxe_pool.c
View File

@ -260,11 +260,12 @@ int __rxe_add_key_locked(struct rxe_pool_elem *elem, void *key)
int __rxe_add_key(struct rxe_pool_elem *elem, void *key)
{
struct rxe_pool *pool = elem->pool;
unsigned long flags;
int err;
write_lock_bh(&pool->pool_lock);
write_lock_irqsave(&pool->pool_lock, flags);
err = __rxe_add_key_locked(elem, key);
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
return err;
}
@ -279,10 +280,11 @@ void __rxe_drop_key_locked(struct rxe_pool_elem *elem)
void __rxe_drop_key(struct rxe_pool_elem *elem)
{
struct rxe_pool *pool = elem->pool;
unsigned long flags;
write_lock_bh(&pool->pool_lock);
write_lock_irqsave(&pool->pool_lock, flags);
__rxe_drop_key_locked(elem);
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
}
int __rxe_add_index_locked(struct rxe_pool_elem *elem)
@ -299,11 +301,12 @@ int __rxe_add_index_locked(struct rxe_pool_elem *elem)
int __rxe_add_index(struct rxe_pool_elem *elem)
{
struct rxe_pool *pool = elem->pool;
unsigned long flags;
int err;
write_lock_bh(&pool->pool_lock);
write_lock_irqsave(&pool->pool_lock, flags);
err = __rxe_add_index_locked(elem);
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
return err;
}
@ -319,10 +322,11 @@ void __rxe_drop_index_locked(struct rxe_pool_elem *elem)
void __rxe_drop_index(struct rxe_pool_elem *elem)
{
struct rxe_pool *pool = elem->pool;
unsigned long flags;
write_lock_bh(&pool->pool_lock);
write_lock_irqsave(&pool->pool_lock, flags);
__rxe_drop_index_locked(elem);
write_unlock_bh(&pool->pool_lock);
write_unlock_irqrestore(&pool->pool_lock, flags);
}
void *rxe_alloc_locked(struct rxe_pool *pool)
@ -440,11 +444,12 @@ void *rxe_pool_get_index_locked(struct rxe_pool *pool, u32 index)
void *rxe_pool_get_index(struct rxe_pool *pool, u32 index)
{
unsigned long flags;
void *obj;
read_lock_bh(&pool->pool_lock);
read_lock_irqsave(&pool->pool_lock, flags);
obj = rxe_pool_get_index_locked(pool, index);
read_unlock_bh(&pool->pool_lock);
read_unlock_irqrestore(&pool->pool_lock, flags);
return obj;
}
@ -484,11 +489,12 @@ void *rxe_pool_get_key_locked(struct rxe_pool *pool, void *key)
void *rxe_pool_get_key(struct rxe_pool *pool, void *key)
{
unsigned long flags;
void *obj;
read_lock_bh(&pool->pool_lock);
read_lock_irqsave(&pool->pool_lock, flags);
obj = rxe_pool_get_key_locked(pool, key);
read_unlock_bh(&pool->pool_lock);
read_unlock_irqrestore(&pool->pool_lock, flags);
return obj;
}

10
drivers/infiniband/sw/rxe/rxe_queue.c
View File

@ -151,6 +151,8 @@ int rxe_queue_resize(struct rxe_queue *q, unsigned int *num_elem_p,
struct rxe_queue *new_q;
unsigned int num_elem = *num_elem_p;
int err;
unsigned long producer_flags;
unsigned long consumer_flags;
new_q = rxe_queue_init(q->rxe, &num_elem, elem_size, q->type);
if (!new_q)
@ -164,17 +166,17 @@ int rxe_queue_resize(struct rxe_queue *q, unsigned int *num_elem_p,
goto err1;
}
spin_lock_bh(consumer_lock);
spin_lock_irqsave(consumer_lock, consumer_flags);
if (producer_lock) {
spin_lock_bh(producer_lock);
spin_lock_irqsave(producer_lock, producer_flags);
err = resize_finish(q, new_q, num_elem);
spin_unlock_bh(producer_lock);
spin_unlock_irqrestore(producer_lock, producer_flags);
} else {
err = resize_finish(q, new_q, num_elem);
}
spin_unlock_bh(consumer_lock);
spin_unlock_irqrestore(consumer_lock, consumer_flags);
rxe_queue_cleanup(new_q); /* new/old dep on err */
if (err)

11
drivers/infiniband/sw/rxe/rxe_resp.c
View File

@ -297,21 +297,22 @@ static enum resp_states get_srq_wqe(struct rxe_qp *qp)
struct ib_event ev;
unsigned int count;
size_t size;
unsigned long flags;
if (srq->error)
return RESPST_ERR_RNR;
spin_lock_bh(&srq->rq.consumer_lock);
spin_lock_irqsave(&srq->rq.consumer_lock, flags);
wqe = queue_head(q, QUEUE_TYPE_FROM_CLIENT);
if (!wqe) {
spin_unlock_bh(&srq->rq.consumer_lock);
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
return RESPST_ERR_RNR;
}
/* don't trust user space data */
if (unlikely(wqe->dma.num_sge > srq->rq.max_sge)) {
spin_unlock_bh(&srq->rq.consumer_lock);
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
pr_warn("%s: invalid num_sge in SRQ entry\n", __func__);
return RESPST_ERR_MALFORMED_WQE;
}
@ -327,11 +328,11 @@ static enum resp_states get_srq_wqe(struct rxe_qp *qp)
goto event;
}
spin_unlock_bh(&srq->rq.consumer_lock);
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
return RESPST_CHK_LENGTH;
event:
spin_unlock_bh(&srq->rq.consumer_lock);
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
ev.device = qp->ibqp.device;
ev.element.srq = qp->ibqp.srq;
ev.event = IB_EVENT_SRQ_LIMIT_REACHED;

27
drivers/infiniband/sw/rxe/rxe_verbs.c
View File

@ -384,8 +384,9 @@ static int rxe_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
{
int err = 0;
struct rxe_srq *srq = to_rsrq(ibsrq);
unsigned long flags;
spin_lock_bh(&srq->rq.producer_lock);
spin_lock_irqsave(&srq->rq.producer_lock, flags);
while (wr) {
err = post_one_recv(&srq->rq, wr);
@ -394,7 +395,7 @@ static int rxe_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
wr = wr->next;
}
spin_unlock_bh(&srq->rq.producer_lock);
spin_unlock_irqrestore(&srq->rq.producer_lock, flags);
if (err)
*bad_wr = wr;
@ -643,18 +644,19 @@ static int post_one_send(struct rxe_qp *qp, const struct ib_send_wr *ibwr,
int err;
struct rxe_sq *sq = &qp->sq;
struct rxe_send_wqe *send_wqe;
unsigned long flags;
int full;
err = validate_send_wr(qp, ibwr, mask, length);
if (err)
return err;
spin_lock_bh(&qp->sq.sq_lock);
spin_lock_irqsave(&qp->sq.sq_lock, flags);
full = queue_full(sq->queue, QUEUE_TYPE_TO_DRIVER);
if (unlikely(full)) {
spin_unlock_bh(&qp->sq.sq_lock);
spin_unlock_irqrestore(&qp->sq.sq_lock, flags);
return -ENOMEM;
}
@ -663,7 +665,7 @@ static int post_one_send(struct rxe_qp *qp, const struct ib_send_wr *ibwr,
queue_advance_producer(sq->queue, QUEUE_TYPE_TO_DRIVER);
spin_unlock_bh(&qp->sq.sq_lock);
spin_unlock_irqrestore(&qp->sq.sq_lock, flags);
return 0;
}
@ -743,6 +745,7 @@ static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
int err = 0;
struct rxe_qp *qp = to_rqp(ibqp);
struct rxe_rq *rq = &qp->rq;
unsigned long flags;
if (unlikely((qp_state(qp) < IB_QPS_INIT) || !qp->valid)) {
*bad_wr = wr;
@ -756,7 +759,7 @@ static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
goto err1;
}
spin_lock_bh(&rq->producer_lock);
spin_lock_irqsave(&rq->producer_lock, flags);
while (wr) {
err = post_one_recv(rq, wr);
@ -767,7 +770,7 @@ static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
wr = wr->next;
}
spin_unlock_bh(&rq->producer_lock);
spin_unlock_irqrestore(&rq->producer_lock, flags);
if (qp->resp.state == QP_STATE_ERROR)
rxe_run_task(&qp->resp.task, 1);
@ -848,8 +851,9 @@ static int rxe_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
int i;
struct rxe_cq *cq = to_rcq(ibcq);
struct rxe_cqe *cqe;
unsigned long flags;
spin_lock_bh(&cq->cq_lock);
spin_lock_irqsave(&cq->cq_lock, flags);
for (i = 0; i < num_entries; i++) {
cqe = queue_head(cq->queue, QUEUE_TYPE_FROM_DRIVER);
if (!cqe)
@ -858,7 +862,7 @@ static int rxe_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
memcpy(wc++, &cqe->ibwc, sizeof(*wc));
queue_advance_consumer(cq->queue, QUEUE_TYPE_FROM_DRIVER);
}
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, flags);
return i;
}
@ -878,8 +882,9 @@ static int rxe_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
struct rxe_cq *cq = to_rcq(ibcq);
int ret = 0;
int empty;
unsigned long irq_flags;
spin_lock_bh(&cq->cq_lock);
spin_lock_irqsave(&cq->cq_lock, irq_flags);
if (cq->notify != IB_CQ_NEXT_COMP)
cq->notify = flags & IB_CQ_SOLICITED_MASK;
@ -888,7 +893,7 @@ static int rxe_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !empty)
ret = 1;
spin_unlock_bh(&cq->cq_lock);
spin_unlock_irqrestore(&cq->cq_lock, irq_flags);
return ret;
}