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RDMA/be2net: Remove open and close entry points
Recently Dough Ledford reported a deadlock happening between ocrdma-load sequence and NetworkManager service issueing "open" on be2net interface. The deadlock happens when any be2net hook (e.g. open/close) is called in parallel to insmod ocrdma.ko. A. be2net is sending administrative open/close event to ocrdma holding device_list_mutex. It does this from ndo_open/ndo_stop hooks of be2net. So sequence of locks is rtnl_lock---> device_list lock B. When new ocrdma roce device gets registered, infiniband stack now takes rtnl_lock in ib_register_device() in GID initialization routines. So sequence of locks in this path is device_list lock ---> rtnl_lock. This improper locking sequence causes deadlock. In order to resolve the above deadlock condition, ocrdma intorduced a patch to stop listening to administrative open/close events generated from be2net driver. It now depends on link-state-change async-event generated from CNA. This change leaves behind dead code which used to generate administrative open/close events. This patch cleans-up all that dead code from be2net. Reported-by: Doug Ledford <dledford@redhat.com> CC: Sathya Perla <sathya.perla@avagotech.com> Signed-off-by: Padmanabh Ratnakar <padmanabh.ratnakar@avagotech.com> Signed-off-by: Selvin Xavier <selvin.xavier@avagotech.com> Signed-off-by: Devesh Sharma <devesh.sharma@avagotech.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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3b1ea43009
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9781808c63
@ -848,8 +848,6 @@ void be_roce_dev_remove(struct be_adapter *);
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/*
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* internal function to open-close roce device during ifup-ifdown.
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*/
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void be_roce_dev_open(struct be_adapter *);
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void be_roce_dev_close(struct be_adapter *);
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void be_roce_dev_shutdown(struct be_adapter *);
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#endif /* BE_H */
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@ -3432,8 +3432,6 @@ static int be_close(struct net_device *netdev)
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be_disable_if_filters(adapter);
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be_roce_dev_close(adapter);
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if (adapter->flags & BE_FLAGS_NAPI_ENABLED) {
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for_all_evt_queues(adapter, eqo, i) {
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napi_disable(&eqo->napi);
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@ -3601,8 +3599,6 @@ static int be_open(struct net_device *netdev)
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be_link_status_update(adapter, link_status);
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netif_tx_start_all_queues(netdev);
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be_roce_dev_open(adapter);
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#ifdef CONFIG_BE2NET_VXLAN
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if (skyhawk_chip(adapter))
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vxlan_get_rx_port(netdev);
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@ -116,40 +116,6 @@ void be_roce_dev_remove(struct be_adapter *adapter)
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}
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}
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static void _be_roce_dev_open(struct be_adapter *adapter)
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{
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if (ocrdma_drv && adapter->ocrdma_dev &&
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ocrdma_drv->state_change_handler)
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ocrdma_drv->state_change_handler(adapter->ocrdma_dev,
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BE_DEV_UP);
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}
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void be_roce_dev_open(struct be_adapter *adapter)
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{
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if (be_roce_supported(adapter)) {
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mutex_lock(&be_adapter_list_lock);
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_be_roce_dev_open(adapter);
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mutex_unlock(&be_adapter_list_lock);
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}
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}
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static void _be_roce_dev_close(struct be_adapter *adapter)
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{
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if (ocrdma_drv && adapter->ocrdma_dev &&
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ocrdma_drv->state_change_handler)
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ocrdma_drv->state_change_handler(adapter->ocrdma_dev,
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BE_DEV_DOWN);
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}
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void be_roce_dev_close(struct be_adapter *adapter)
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{
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if (be_roce_supported(adapter)) {
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mutex_lock(&be_adapter_list_lock);
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_be_roce_dev_close(adapter);
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mutex_unlock(&be_adapter_list_lock);
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}
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}
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void be_roce_dev_shutdown(struct be_adapter *adapter)
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{
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if (be_roce_supported(adapter)) {
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@ -177,8 +143,6 @@ int be_roce_register_driver(struct ocrdma_driver *drv)
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_be_roce_dev_add(dev);
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netdev = dev->netdev;
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if (netif_running(netdev) && netif_oper_up(netdev))
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_be_roce_dev_open(dev);
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}
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mutex_unlock(&be_adapter_list_lock);
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return 0;
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@ -60,9 +60,7 @@ struct ocrdma_driver {
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void (*state_change_handler) (struct ocrdma_dev *, u32 new_state);
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};
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enum {
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BE_DEV_UP = 0,
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BE_DEV_DOWN = 1,
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enum be_roce_event {
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BE_DEV_SHUTDOWN = 2
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};
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