RDMA/cma: Protect RMW with qp_mutex

The struct rdma_id_private contains three bit-fields, tos_set,
timeout_set, and min_rnr_timer_set. These are set by accessor functions
without any synchronization. If two or all accessor functions are invoked
in close proximity in time, there will be Read-Modify-Write from several
contexts to the same variable, and the result will be intermittent.

Fixed by protecting the bit-fields by the qp_mutex in the accessor
functions.

The consumer of timeout_set and min_rnr_timer_set is in
rdma_init_qp_attr(), which is called with qp_mutex held for connected
QPs. Explicit locking is added for the consumers of tos and tos_set.

This commit depends on ("RDMA/cma: Remove unnecessary INIT->INIT
transition"), since the call to rdma_init_qp_attr() from
cma_init_conn_qp() does not hold the qp_mutex.

Fixes: 2c1619edef61 ("IB/cma: Define option to set ack timeout and pack tos_set")
Fixes: 3aeffc46afde ("IB/cma: Introduce rdma_set_min_rnr_timer()")
Link: https://lore.kernel.org/r/1624369197-24578-3-git-send-email-haakon.bugge@oracle.com
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index e3f52c516094d734ca0e5f6f973ef1f8774fa885..6b6fa82e7943cbe92536276049f59de67551bba5 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2457,8 +2457,10 @@ static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
        if (IS_ERR(id))
                return PTR_ERR(id);
 
+       mutex_lock(&id_priv->qp_mutex);
        id->tos = id_priv->tos;
        id->tos_set = id_priv->tos_set;
+       mutex_unlock(&id_priv->qp_mutex);
        id->afonly = id_priv->afonly;
        id_priv->cm_id.iw = id;
 
@@ -2519,8 +2521,10 @@ static int cma_listen_on_dev(struct rdma_id_private *id_priv,
        cma_id_get(id_priv);
        dev_id_priv->internal_id = 1;
        dev_id_priv->afonly = id_priv->afonly;
+       mutex_lock(&id_priv->qp_mutex);
        dev_id_priv->tos_set = id_priv->tos_set;
        dev_id_priv->tos = id_priv->tos;
+       mutex_unlock(&id_priv->qp_mutex);
 
        ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
        if (ret)
@@ -2567,8 +2571,10 @@ void rdma_set_service_type(struct rdma_cm_id *id, int tos)
        struct rdma_id_private *id_priv;
 
        id_priv = container_of(id, struct rdma_id_private, id);
+       mutex_lock(&id_priv->qp_mutex);
        id_priv->tos = (u8) tos;
        id_priv->tos_set = true;
+       mutex_unlock(&id_priv->qp_mutex);
 }
 EXPORT_SYMBOL(rdma_set_service_type);
 
@@ -2595,8 +2601,10 @@ int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
                return -EINVAL;
 
        id_priv = container_of(id, struct rdma_id_private, id);
+       mutex_lock(&id_priv->qp_mutex);
        id_priv->timeout = timeout;
        id_priv->timeout_set = true;
+       mutex_unlock(&id_priv->qp_mutex);
 
        return 0;
 }
@@ -2632,8 +2640,10 @@ int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
                return -EINVAL;
 
        id_priv = container_of(id, struct rdma_id_private, id);
+       mutex_lock(&id_priv->qp_mutex);
        id_priv->min_rnr_timer = min_rnr_timer;
        id_priv->min_rnr_timer_set = true;
+       mutex_unlock(&id_priv->qp_mutex);
 
        return 0;
 }
@@ -3019,8 +3029,11 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 
        u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
                                        rdma_start_port(id_priv->cma_dev->device)];
-       u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
+       u8 tos;
 
+       mutex_lock(&id_priv->qp_mutex);
+       tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
+       mutex_unlock(&id_priv->qp_mutex);
 
        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (!work)
@@ -3067,8 +3080,10 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
         * PacketLifeTime = local ACK timeout/2
         * as a reasonable approximation for RoCE networks.
         */
+       mutex_lock(&id_priv->qp_mutex);
        route->path_rec->packet_life_time = id_priv->timeout_set ?
                id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
+       mutex_unlock(&id_priv->qp_mutex);
 
        if (!route->path_rec->mtu) {
                ret = -EINVAL;
@@ -4092,8 +4107,11 @@ static int cma_connect_iw(struct rdma_id_private *id_priv,
        if (IS_ERR(cm_id))
                return PTR_ERR(cm_id);
 
+       mutex_lock(&id_priv->qp_mutex);
        cm_id->tos = id_priv->tos;
        cm_id->tos_set = id_priv->tos_set;
+       mutex_unlock(&id_priv->qp_mutex);
+
        id_priv->cm_id.iw = cm_id;
 
        memcpy(&cm_id->local_addr, cma_src_addr(id_priv),