| Message ID | 0-v1-75e124dbad74+b05-rdma_connect_locking_jgg@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | RDMA: Add rdma_connect_locked() | expand |
On 10/26/20 7:25 AM, Jason Gunthorpe wrote: > There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the > handler triggers a completion and another thread does rdma_connect() or > the handler directly calls rdma_connect(). > > In all cases rdma_connect() needs to hold the handler_mutex, but when > handler's are invoked this is already held by the core code. This causes > ULPs using the 2nd method to deadlock. > > Provide a rdma_connect_locked() and have all ULPs call it from their > handlers. > > Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> > Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state" > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> > --- [....] > diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c > index 06603dd1c8aa38..b36b60668b1da9 100644 > --- a/net/rds/ib_cm.c > +++ b/net/rds/ib_cm.c > @@ -956,9 +956,10 @@ int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6) > rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, > conn->c_proposed_version, > UINT_MAX, UINT_MAX, isv6); > - ret = rdma_connect(cm_id, &conn_param); > + ret = rdma_connect_locked(cm_id, &conn_param); > if (ret) > - rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); > + rds_ib_conn_error(conn, "rdma_connect_locked failed (%d)\n", > + ret); > > out: > /* Beware - returning non-zero tells the rdma_cm to destroy > For RDS part, Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
On 2020/10/26 22:25, Jason Gunthorpe wrote: > There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the > handler triggers a completion and another thread does rdma_connect() or > the handler directly calls rdma_connect(). > > In all cases rdma_connect() needs to hold the handler_mutex, but when > handler's are invoked this is already held by the core code. This causes > ULPs using the 2nd method to deadlock. > > Provide a rdma_connect_locked() and have all ULPs call it from their > handlers. > > Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> > Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state" > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> > --- > drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++--- > drivers/infiniband/ulp/iser/iser_verbs.c | 2 +- > drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 +-- > drivers/nvme/host/rdma.c | 10 +++--- > include/rdma/rdma_cm.h | 13 +------- > net/rds/ib_cm.c | 5 +-- > 6 files changed, 47 insertions(+), 26 deletions(-) > > Seems people are not testing these four ULPs against rdma-next.. Here is a > quick fix for the issue: > > https://lore.kernel.org/r/3b1f7767-98e2-93e0-b718-16d1c5346140@cloud.ionos.com > > Jason > > diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c > index 7c2ab1f2fbea37..2eaaa1292fb847 100644 > --- a/drivers/infiniband/core/cma.c > +++ b/drivers/infiniband/core/cma.c > @@ -405,10 +405,10 @@ static int cma_comp_exch(struct rdma_id_private *id_priv, > /* > * The FSM uses a funny double locking where state is protected by both > * the handler_mutex and the spinlock. State is not allowed to change > - * away from a handler_mutex protected value without also holding > + * to/from a handler_mutex protected value without also holding > * handler_mutex. > */ > - if (comp == RDMA_CM_CONNECT) > + if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT) > lockdep_assert_held(&id_priv->handler_mutex); > > spin_lock_irqsave(&id_priv->lock, flags); > @@ -4038,13 +4038,20 @@ static int cma_connect_iw(struct rdma_id_private *id_priv, > return ret; > } > > -int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > +/** > + * rdma_connect_locked - Initiate an active connection request. > + * @id: Connection identifier to connect. > + * @conn_param: Connection information used for connected QPs. > + * > + * Same as rdma_connect() but can only be called from the > + * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback. > + */ > +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > { > struct rdma_id_private *id_priv = > container_of(id, struct rdma_id_private, id); > int ret; > > - mutex_lock(&id_priv->handler_mutex); > if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT)) { > ret = -EINVAL; > goto err_unlock; > @@ -4071,6 +4078,30 @@ int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > err_state: > cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED); > err_unlock: > + return ret; > +} > +EXPORT_SYMBOL(rdma_connect_locked); > + > +/** > + * rdma_connect - Initiate an active connection request. > + * @id: Connection identifier to connect. > + * @conn_param: Connection information used for connected QPs. > + * > + * Users must have resolved a route for the rdma_cm_id to connect with by having > + * called rdma_resolve_route before calling this routine. > + * > + * This call will either connect to a remote QP or obtain remote QP information > + * for unconnected rdma_cm_id's. The actual operation is based on the > + * rdma_cm_id's port space. > + */ > +int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > +{ > + struct rdma_id_private *id_priv = > + container_of(id, struct rdma_id_private, id); > + int ret; > + > + mutex_lock(&id_priv->handler_mutex); > + ret = rdma_connect_locked(id, conn_param); > mutex_unlock(&id_priv->handler_mutex); > return ret; > } > diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c > index 2f3ebc0a75d924..2bd18b00689341 100644 > --- a/drivers/infiniband/ulp/iser/iser_verbs.c > +++ b/drivers/infiniband/ulp/iser/iser_verbs.c > @@ -620,7 +620,7 @@ static void iser_route_handler(struct rdma_cm_id *cma_id) > conn_param.private_data = (void *)&req_hdr; > conn_param.private_data_len = sizeof(struct iser_cm_hdr); > > - ret = rdma_connect(cma_id, &conn_param); > + ret = rdma_connect_locked(cma_id, &conn_param); > if (ret) { > iser_err("failure connecting: %d\n", ret); > goto failure; > diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c > index 776e89231c52f7..f298adc02acba2 100644 > --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c > +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c > @@ -1674,9 +1674,9 @@ static int rtrs_rdma_route_resolved(struct rtrs_clt_con *con) > uuid_copy(&msg.sess_uuid, &sess->s.uuid); > uuid_copy(&msg.paths_uuid, &clt->paths_uuid); > > - err = rdma_connect(con->c.cm_id, ¶m); > + err = rdma_connect_locked(con->c.cm_id, ¶m); > if (err) > - rtrs_err(clt, "rdma_connect(): %d\n", err); > + rtrs_err(clt, "rdma_connect_locked(): %d\n", err); > > return err; > } > diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c > index aad829a2b50d0f..f488dc5f4c2c61 100644 > --- a/drivers/nvme/host/rdma.c > +++ b/drivers/nvme/host/rdma.c > @@ -1730,11 +1730,10 @@ static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, > req->result = cqe->result; > > if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { > - if (unlikely(!req->mr || > - wc->ex.invalidate_rkey != req->mr->rkey)) { > + if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) { > dev_err(queue->ctrl->ctrl.device, > "Bogus remote invalidation for rkey %#x\n", > - req->mr ? req->mr->rkey : 0); > + req->mr->rkey); Maybe the code version is incorrect, cause falsely code rollback. > nvme_rdma_error_recovery(queue->ctrl); > } > } else if (req->mr) { > @@ -1890,10 +1889,10 @@ static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) > priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize); > } > > - ret = rdma_connect(queue->cm_id, ¶m); > + ret = rdma_connect_locked(queue->cm_id, ¶m); > if (ret) { > dev_err(ctrl->ctrl.device, > - "rdma_connect failed (%d).\n", ret); > + "rdma_connect_locked failed (%d).\n", ret); > goto out_destroy_queue_ib; > } > > @@ -1927,6 +1926,7 @@ static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, > complete(&queue->cm_done); > return 0; > case RDMA_CM_EVENT_REJECTED: > + nvme_rdma_destroy_queue_ib(queue); Maybe the code version is incorrect, cause falsely code rollback. > cm_error = nvme_rdma_conn_rejected(queue, ev); > break; > case RDMA_CM_EVENT_ROUTE_ERROR: > diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h > index c672ae1da26bb5..937d55611cd073 100644 > --- a/include/rdma/rdma_cm.h > +++ b/include/rdma/rdma_cm.h > @@ -227,19 +227,8 @@ void rdma_destroy_qp(struct rdma_cm_id *id); > int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, > int *qp_attr_mask); > > -/** > - * rdma_connect - Initiate an active connection request. > - * @id: Connection identifier to connect. > - * @conn_param: Connection information used for connected QPs. > - * > - * Users must have resolved a route for the rdma_cm_id to connect with > - * by having called rdma_resolve_route before calling this routine. > - * > - * This call will either connect to a remote QP or obtain remote QP > - * information for unconnected rdma_cm_id's. The actual operation is > - * based on the rdma_cm_id's port space. > - */ > int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); > +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); > > int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param, > struct rdma_ucm_ece *ece); > diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c > index 06603dd1c8aa38..b36b60668b1da9 100644 > --- a/net/rds/ib_cm.c > +++ b/net/rds/ib_cm.c > @@ -956,9 +956,10 @@ int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6) > rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, > conn->c_proposed_version, > UINT_MAX, UINT_MAX, isv6); > - ret = rdma_connect(cm_id, &conn_param); > + ret = rdma_connect_locked(cm_id, &conn_param); > if (ret) > - rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); > + rds_ib_conn_error(conn, "rdma_connect_locked failed (%d)\n", > + ret); > > out: > /* Beware - returning non-zero tells the rdma_cm to destroy >
On Mon, Oct 26, 2020 at 3:25 PM Jason Gunthorpe <jgg@nvidia.com> wrote: > > There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the > handler triggers a completion and another thread does rdma_connect() or > the handler directly calls rdma_connect(). > > In all cases rdma_connect() needs to hold the handler_mutex, but when > handler's are invoked this is already held by the core code. This causes > ULPs using the 2nd method to deadlock. > > Provide a rdma_connect_locked() and have all ULPs call it from their > handlers. > > Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> > Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state" > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> > --- > drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++--- > drivers/infiniband/ulp/iser/iser_verbs.c | 2 +- > drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 +-- > drivers/nvme/host/rdma.c | 10 +++--- > include/rdma/rdma_cm.h | 13 +------- > net/rds/ib_cm.c | 5 +-- > 6 files changed, 47 insertions(+), 26 deletions(-) > > Seems people are not testing these four ULPs against rdma-next.. Here is a > quick fix for the issue: > > https://lore.kernel.org/r/3b1f7767-98e2-93e0-b718-16d1c5346140@cloud.ionos.com > > Jason > > diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c > index 7c2ab1f2fbea37..2eaaa1292fb847 100644 > --- a/drivers/infiniband/core/cma.c > +++ b/drivers/infiniband/core/cma.c > @@ -405,10 +405,10 @@ static int cma_comp_exch(struct rdma_id_private *id_priv, > /* > * The FSM uses a funny double locking where state is protected by both > * the handler_mutex and the spinlock. State is not allowed to change > - * away from a handler_mutex protected value without also holding > + * to/from a handler_mutex protected value without also holding > * handler_mutex. > */ > - if (comp == RDMA_CM_CONNECT) > + if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT) > lockdep_assert_held(&id_priv->handler_mutex); > > spin_lock_irqsave(&id_priv->lock, flags); > @@ -4038,13 +4038,20 @@ static int cma_connect_iw(struct rdma_id_private *id_priv, > return ret; > } > > -int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > +/** > + * rdma_connect_locked - Initiate an active connection request. > + * @id: Connection identifier to connect. > + * @conn_param: Connection information used for connected QPs. > + * > + * Same as rdma_connect() but can only be called from the > + * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback. > + */ > +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > { > struct rdma_id_private *id_priv = > container_of(id, struct rdma_id_private, id); > int ret; > > - mutex_lock(&id_priv->handler_mutex); > if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT)) { > ret = -EINVAL; > goto err_unlock; > @@ -4071,6 +4078,30 @@ int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > err_state: > cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED); > err_unlock: > + return ret; > +} > +EXPORT_SYMBOL(rdma_connect_locked); > + > +/** > + * rdma_connect - Initiate an active connection request. > + * @id: Connection identifier to connect. > + * @conn_param: Connection information used for connected QPs. > + * > + * Users must have resolved a route for the rdma_cm_id to connect with by having > + * called rdma_resolve_route before calling this routine. > + * > + * This call will either connect to a remote QP or obtain remote QP information > + * for unconnected rdma_cm_id's. The actual operation is based on the > + * rdma_cm_id's port space. > + */ > +int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) > +{ > + struct rdma_id_private *id_priv = > + container_of(id, struct rdma_id_private, id); > + int ret; > + > + mutex_lock(&id_priv->handler_mutex); > + ret = rdma_connect_locked(id, conn_param); > mutex_unlock(&id_priv->handler_mutex); > return ret; > } > diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c > index 2f3ebc0a75d924..2bd18b00689341 100644 > --- a/drivers/infiniband/ulp/iser/iser_verbs.c > +++ b/drivers/infiniband/ulp/iser/iser_verbs.c > @@ -620,7 +620,7 @@ static void iser_route_handler(struct rdma_cm_id *cma_id) > conn_param.private_data = (void *)&req_hdr; > conn_param.private_data_len = sizeof(struct iser_cm_hdr); > > - ret = rdma_connect(cma_id, &conn_param); > + ret = rdma_connect_locked(cma_id, &conn_param); > if (ret) { > iser_err("failure connecting: %d\n", ret); > goto failure; > diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c > index 776e89231c52f7..f298adc02acba2 100644 > --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c > +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c > @@ -1674,9 +1674,9 @@ static int rtrs_rdma_route_resolved(struct rtrs_clt_con *con) > uuid_copy(&msg.sess_uuid, &sess->s.uuid); > uuid_copy(&msg.paths_uuid, &clt->paths_uuid); > > - err = rdma_connect(con->c.cm_id, ¶m); > + err = rdma_connect_locked(con->c.cm_id, ¶m); > if (err) > - rtrs_err(clt, "rdma_connect(): %d\n", err); > + rtrs_err(clt, "rdma_connect_locked(): %d\n", err); > > return err; > } For rtrs, looks good to me! Thanks for the quick fix. Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
> +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) This adds an overly long line. > +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); Same here. Otherwise looks good except for the nvme merge error pointed out by Chao Leng. Reviewed-by: Christoph Hellwig <hch@lst.de>
On Tue, Oct 27, 2020 at 10:01:00AM +0800, Chao Leng wrote: > > diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c > > index aad829a2b50d0f..f488dc5f4c2c61 100644 > > +++ b/drivers/nvme/host/rdma.c > > @@ -1730,11 +1730,10 @@ static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, > > req->result = cqe->result; > > if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { > > - if (unlikely(!req->mr || > > - wc->ex.invalidate_rkey != req->mr->rkey)) { > > + if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) { > > dev_err(queue->ctrl->ctrl.device, > > "Bogus remote invalidation for rkey %#x\n", > > - req->mr ? req->mr->rkey : 0); > > + req->mr->rkey); > Maybe the code version is incorrect, cause falsely code rollback. Oh wow, thanks for noticing that, I made a git fumble when doing this :( Jason
On 10/26/20 15:25, Jason Gunthorpe wrote: > There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the > handler triggers a completion and another thread does rdma_connect() or > the handler directly calls rdma_connect(). > > In all cases rdma_connect() needs to hold the handler_mutex, but when > handler's are invoked this is already held by the core code. This causes > ULPs using the 2nd method to deadlock. > > Provide a rdma_connect_locked() and have all ULPs call it from their > handlers. > > Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> > Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state" > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> > --- > drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++--- > drivers/infiniband/ulp/iser/iser_verbs.c | 2 +- > drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 +-- > drivers/nvme/host/rdma.c | 10 +++--- > include/rdma/rdma_cm.h | 13 +------- > net/rds/ib_cm.c | 5 +-- > 6 files changed, 47 insertions(+), 26 deletions(-) > > Seems people are not testing these four ULPs against rdma-next.. Here is a > quick fix for the issue: > > https://lore.kernel.org/r/3b1f7767-98e2-93e0-b718-16d1c5346140@cloud.ionos.com I can't see the previous calltrace with this patch. Tested-by: Guoqing Jiang<guoqing.jiang@cloud.ionos.com> Thanks, Guoqing
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 7c2ab1f2fbea37..2eaaa1292fb847 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -405,10 +405,10 @@ static int cma_comp_exch(struct rdma_id_private *id_priv, /* * The FSM uses a funny double locking where state is protected by both * the handler_mutex and the spinlock. State is not allowed to change - * away from a handler_mutex protected value without also holding + * to/from a handler_mutex protected value without also holding * handler_mutex. */ - if (comp == RDMA_CM_CONNECT) + if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT) lockdep_assert_held(&id_priv->handler_mutex); spin_lock_irqsave(&id_priv->lock, flags); @@ -4038,13 +4038,20 @@ static int cma_connect_iw(struct rdma_id_private *id_priv, return ret; } -int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) +/** + * rdma_connect_locked - Initiate an active connection request. + * @id: Connection identifier to connect. + * @conn_param: Connection information used for connected QPs. + * + * Same as rdma_connect() but can only be called from the + * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback. + */ +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) { struct rdma_id_private *id_priv = container_of(id, struct rdma_id_private, id); int ret; - mutex_lock(&id_priv->handler_mutex); if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT)) { ret = -EINVAL; goto err_unlock; @@ -4071,6 +4078,30 @@ int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) err_state: cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED); err_unlock: + return ret; +} +EXPORT_SYMBOL(rdma_connect_locked); + +/** + * rdma_connect - Initiate an active connection request. + * @id: Connection identifier to connect. + * @conn_param: Connection information used for connected QPs. + * + * Users must have resolved a route for the rdma_cm_id to connect with by having + * called rdma_resolve_route before calling this routine. + * + * This call will either connect to a remote QP or obtain remote QP information + * for unconnected rdma_cm_id's. The actual operation is based on the + * rdma_cm_id's port space. + */ +int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + mutex_lock(&id_priv->handler_mutex); + ret = rdma_connect_locked(id, conn_param); mutex_unlock(&id_priv->handler_mutex); return ret; } diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 2f3ebc0a75d924..2bd18b00689341 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -620,7 +620,7 @@ static void iser_route_handler(struct rdma_cm_id *cma_id) conn_param.private_data = (void *)&req_hdr; conn_param.private_data_len = sizeof(struct iser_cm_hdr); - ret = rdma_connect(cma_id, &conn_param); + ret = rdma_connect_locked(cma_id, &conn_param); if (ret) { iser_err("failure connecting: %d\n", ret); goto failure; diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c index 776e89231c52f7..f298adc02acba2 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c @@ -1674,9 +1674,9 @@ static int rtrs_rdma_route_resolved(struct rtrs_clt_con *con) uuid_copy(&msg.sess_uuid, &sess->s.uuid); uuid_copy(&msg.paths_uuid, &clt->paths_uuid); - err = rdma_connect(con->c.cm_id, ¶m); + err = rdma_connect_locked(con->c.cm_id, ¶m); if (err) - rtrs_err(clt, "rdma_connect(): %d\n", err); + rtrs_err(clt, "rdma_connect_locked(): %d\n", err); return err; } diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index aad829a2b50d0f..f488dc5f4c2c61 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1730,11 +1730,10 @@ static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, req->result = cqe->result; if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { - if (unlikely(!req->mr || - wc->ex.invalidate_rkey != req->mr->rkey)) { + if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) { dev_err(queue->ctrl->ctrl.device, "Bogus remote invalidation for rkey %#x\n", - req->mr ? req->mr->rkey : 0); + req->mr->rkey); nvme_rdma_error_recovery(queue->ctrl); } } else if (req->mr) { @@ -1890,10 +1889,10 @@ static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize); } - ret = rdma_connect(queue->cm_id, ¶m); + ret = rdma_connect_locked(queue->cm_id, ¶m); if (ret) { dev_err(ctrl->ctrl.device, - "rdma_connect failed (%d).\n", ret); + "rdma_connect_locked failed (%d).\n", ret); goto out_destroy_queue_ib; } @@ -1927,6 +1926,7 @@ static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, complete(&queue->cm_done); return 0; case RDMA_CM_EVENT_REJECTED: + nvme_rdma_destroy_queue_ib(queue); cm_error = nvme_rdma_conn_rejected(queue, ev); break; case RDMA_CM_EVENT_ROUTE_ERROR: diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h index c672ae1da26bb5..937d55611cd073 100644 --- a/include/rdma/rdma_cm.h +++ b/include/rdma/rdma_cm.h @@ -227,19 +227,8 @@ void rdma_destroy_qp(struct rdma_cm_id *id); int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, int *qp_attr_mask); -/** - * rdma_connect - Initiate an active connection request. - * @id: Connection identifier to connect. - * @conn_param: Connection information used for connected QPs. - * - * Users must have resolved a route for the rdma_cm_id to connect with - * by having called rdma_resolve_route before calling this routine. - * - * This call will either connect to a remote QP or obtain remote QP - * information for unconnected rdma_cm_id's. The actual operation is - * based on the rdma_cm_id's port space. - */ int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); +int rdma_connect_locked(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param, struct rdma_ucm_ece *ece); diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index 06603dd1c8aa38..b36b60668b1da9 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -956,9 +956,10 @@ int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6) rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, conn->c_proposed_version, UINT_MAX, UINT_MAX, isv6); - ret = rdma_connect(cm_id, &conn_param); + ret = rdma_connect_locked(cm_id, &conn_param); if (ret) - rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); + rds_ib_conn_error(conn, "rdma_connect_locked failed (%d)\n", + ret); out: /* Beware - returning non-zero tells the rdma_cm to destroy
There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the handler triggers a completion and another thread does rdma_connect() or the handler directly calls rdma_connect(). In all cases rdma_connect() needs to hold the handler_mutex, but when handler's are invoked this is already held by the core code. This causes ULPs using the 2nd method to deadlock. Provide a rdma_connect_locked() and have all ULPs call it from their handlers. Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state" Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> --- drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++--- drivers/infiniband/ulp/iser/iser_verbs.c | 2 +- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 +-- drivers/nvme/host/rdma.c | 10 +++--- include/rdma/rdma_cm.h | 13 +------- net/rds/ib_cm.c | 5 +-- 6 files changed, 47 insertions(+), 26 deletions(-) Seems people are not testing these four ULPs against rdma-next.. Here is a quick fix for the issue: https://lore.kernel.org/r/3b1f7767-98e2-93e0-b718-16d1c5346140@cloud.ionos.com Jason