mlx5-next-netdev-deadlock
This series from Jiri solves a deadlock when removing a network namespace with mlx5 devlink instance being in it. The deadlock is between: 1) mlx5_ib->unregister_netdevice_notifier() AND 2) mlx5_core->devlink_reload->cleanup_net() To slove this introduced mlx5 netdev added/removed events to track uplink netdev to be used for register_netdevice_notifier_dev_net() purposes. -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEGhZs6bAKwk/OTgTpSD+KveBX+j4FAmPkeZAACgkQSD+KveBX +j6Digf/fTtMmV2I2GwKQJCza4+MAP8Nt9tKInj3x02AoNVXNwHupL72HWZiaKnB YGvPAwjDvxPy2Ok1BsHJLyEOTZpZse8QtS/Sjzk00lovtOYzCwLdJfBrNnVRS5KV Cz/dNtlQcpsAoErFSfmvraLhn7tMNrHMTDahzaNalDkO3wZYXUh+2VDwnXErQy+3 1HI9m2pGy8hQ3sNQTNhqcyY4mp1Qw3nTVIkE8c9E5TJcawVkk4xqlgQuT43nqcn5 H+CTXJTFyUMNkF8kNPTMvMoYfTYWhBqbZKuf+YDyQKwdf5IZyc1kuRIaqJNs5VjU mUtwKHMk5apKLbE8rvmZlg/+geTlJA== =Aqcc -----END PGP SIGNATURE----- Merge tag 'mlx5-next-netdev-deadlock' of git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux Saeed Mahameed says: ==================== mlx5-next-netdev-deadlock This series from Jiri solves a deadlock when removing a network namespace with mlx5 devlink instance being in it. The deadlock is between: 1) mlx5_ib->unregister_netdevice_notifier() AND 2) mlx5_core->devlink_reload->cleanup_net() To slove this introduced mlx5 netdev added/removed events to track uplink netdev to be used for register_netdevice_notifier_dev_net() purposes. * tag 'mlx5-next-netdev-deadlock' of git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux: RDMA/mlx5: Track netdev to avoid deadlock during netdev notifier unregister net/mlx5e: Propagate an internal event in case uplink netdev changes net/mlx5e: Fix trap event handling net/mlx5: Introduce CQE error syndrome ==================== Link: https://lore.kernel.org/r/20230208005626.72930-1-saeed@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
Коммит
9245b518c8
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@ -3012,26 +3012,63 @@ static void mlx5_eth_lag_cleanup(struct mlx5_ib_dev *dev)
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}
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}
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static int mlx5_add_netdev_notifier(struct mlx5_ib_dev *dev, u32 port_num)
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static void mlx5_netdev_notifier_register(struct mlx5_roce *roce,
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struct net_device *netdev)
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{
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int err;
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dev->port[port_num].roce.nb.notifier_call = mlx5_netdev_event;
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err = register_netdevice_notifier(&dev->port[port_num].roce.nb);
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if (err) {
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dev->port[port_num].roce.nb.notifier_call = NULL;
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return err;
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}
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return 0;
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if (roce->tracking_netdev)
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return;
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roce->tracking_netdev = netdev;
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roce->nb.notifier_call = mlx5_netdev_event;
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err = register_netdevice_notifier_dev_net(netdev, &roce->nb, &roce->nn);
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WARN_ON(err);
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}
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static void mlx5_remove_netdev_notifier(struct mlx5_ib_dev *dev, u32 port_num)
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static void mlx5_netdev_notifier_unregister(struct mlx5_roce *roce)
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{
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if (dev->port[port_num].roce.nb.notifier_call) {
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unregister_netdevice_notifier(&dev->port[port_num].roce.nb);
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dev->port[port_num].roce.nb.notifier_call = NULL;
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if (!roce->tracking_netdev)
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return;
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unregister_netdevice_notifier_dev_net(roce->tracking_netdev, &roce->nb,
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&roce->nn);
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roce->tracking_netdev = NULL;
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}
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static int mlx5e_mdev_notifier_event(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct mlx5_roce *roce = container_of(nb, struct mlx5_roce, mdev_nb);
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struct net_device *netdev = data;
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switch (event) {
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case MLX5_DRIVER_EVENT_UPLINK_NETDEV:
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if (netdev)
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mlx5_netdev_notifier_register(roce, netdev);
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else
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mlx5_netdev_notifier_unregister(roce);
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break;
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default:
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return NOTIFY_DONE;
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}
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return NOTIFY_OK;
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}
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static void mlx5_mdev_netdev_track(struct mlx5_ib_dev *dev, u32 port_num)
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{
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struct mlx5_roce *roce = &dev->port[port_num].roce;
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roce->mdev_nb.notifier_call = mlx5e_mdev_notifier_event;
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mlx5_blocking_notifier_register(dev->mdev, &roce->mdev_nb);
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mlx5_core_uplink_netdev_event_replay(dev->mdev);
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}
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static void mlx5_mdev_netdev_untrack(struct mlx5_ib_dev *dev, u32 port_num)
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{
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struct mlx5_roce *roce = &dev->port[port_num].roce;
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mlx5_blocking_notifier_unregister(dev->mdev, &roce->mdev_nb);
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mlx5_netdev_notifier_unregister(roce);
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}
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static int mlx5_enable_eth(struct mlx5_ib_dev *dev)
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@ -3138,7 +3175,7 @@ static void mlx5_ib_unbind_slave_port(struct mlx5_ib_dev *ibdev,
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if (mpi->mdev_events.notifier_call)
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mlx5_notifier_unregister(mpi->mdev, &mpi->mdev_events);
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mpi->mdev_events.notifier_call = NULL;
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mlx5_remove_netdev_notifier(ibdev, port_num);
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mlx5_mdev_netdev_untrack(ibdev, port_num);
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spin_lock(&port->mp.mpi_lock);
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comps = mpi->mdev_refcnt;
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@ -3196,12 +3233,7 @@ static bool mlx5_ib_bind_slave_port(struct mlx5_ib_dev *ibdev,
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if (err)
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goto unbind;
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err = mlx5_add_netdev_notifier(ibdev, port_num);
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if (err) {
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mlx5_ib_err(ibdev, "failed adding netdev notifier for port %u\n",
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port_num + 1);
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goto unbind;
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}
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mlx5_mdev_netdev_track(ibdev, port_num);
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mpi->mdev_events.notifier_call = mlx5_ib_event_slave_port;
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mlx5_notifier_register(mpi->mdev, &mpi->mdev_events);
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@ -3909,9 +3941,7 @@ static int mlx5_ib_roce_init(struct mlx5_ib_dev *dev)
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port_num = mlx5_core_native_port_num(dev->mdev) - 1;
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/* Register only for native ports */
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err = mlx5_add_netdev_notifier(dev, port_num);
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if (err)
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return err;
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mlx5_mdev_netdev_track(dev, port_num);
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err = mlx5_enable_eth(dev);
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if (err)
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@ -3920,7 +3950,7 @@ static int mlx5_ib_roce_init(struct mlx5_ib_dev *dev)
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return 0;
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cleanup:
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mlx5_remove_netdev_notifier(dev, port_num);
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mlx5_mdev_netdev_untrack(dev, port_num);
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return err;
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}
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@ -3938,7 +3968,7 @@ static void mlx5_ib_roce_cleanup(struct mlx5_ib_dev *dev)
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mlx5_disable_eth(dev);
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port_num = mlx5_core_native_port_num(dev->mdev) - 1;
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mlx5_remove_netdev_notifier(dev, port_num);
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mlx5_mdev_netdev_untrack(dev, port_num);
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}
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}
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@ -832,6 +832,9 @@ struct mlx5_roce {
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rwlock_t netdev_lock;
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struct net_device *netdev;
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struct notifier_block nb;
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struct netdev_net_notifier nn;
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struct notifier_block mdev_nb;
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struct net_device *tracking_netdev;
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atomic_t tx_port_affinity;
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enum ib_port_state last_port_state;
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struct mlx5_ib_dev *dev;
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@ -268,9 +268,10 @@ static int mlx5_devlink_trap_action_set(struct devlink *devlink,
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struct netlink_ext_ack *extack)
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{
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struct mlx5_core_dev *dev = devlink_priv(devlink);
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struct mlx5_devlink_trap_event_ctx trap_event_ctx;
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enum devlink_trap_action action_orig;
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struct mlx5_devlink_trap *dl_trap;
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int err = 0;
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int err;
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if (is_mdev_switchdev_mode(dev)) {
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NL_SET_ERR_MSG_MOD(extack, "Devlink traps can't be set in switchdev mode");
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@ -280,26 +281,25 @@ static int mlx5_devlink_trap_action_set(struct devlink *devlink,
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dl_trap = mlx5_find_trap_by_id(dev, trap->id);
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if (!dl_trap) {
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mlx5_core_err(dev, "Devlink trap: Set action on invalid trap id 0x%x", trap->id);
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err = -EINVAL;
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goto out;
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return -EINVAL;
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}
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if (action != DEVLINK_TRAP_ACTION_DROP && action != DEVLINK_TRAP_ACTION_TRAP) {
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err = -EOPNOTSUPP;
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goto out;
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}
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if (action != DEVLINK_TRAP_ACTION_DROP && action != DEVLINK_TRAP_ACTION_TRAP)
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return -EOPNOTSUPP;
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if (action == dl_trap->trap.action)
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goto out;
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return 0;
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action_orig = dl_trap->trap.action;
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dl_trap->trap.action = action;
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trap_event_ctx.trap = &dl_trap->trap;
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trap_event_ctx.err = 0;
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err = mlx5_blocking_notifier_call_chain(dev, MLX5_DRIVER_EVENT_TYPE_TRAP,
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&dl_trap->trap);
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if (err)
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&trap_event_ctx);
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if (err == NOTIFY_BAD)
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dl_trap->trap.action = action_orig;
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out:
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return err;
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return trap_event_ctx.err;
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}
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static const struct devlink_ops mlx5_devlink_ops = {
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@ -24,6 +24,11 @@ struct mlx5_devlink_trap {
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struct list_head list;
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};
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struct mlx5_devlink_trap_event_ctx {
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struct mlx5_trap_ctx *trap;
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int err;
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};
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struct mlx5_core_dev;
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void mlx5_devlink_trap_report(struct mlx5_core_dev *dev, int trap_id, struct sk_buff *skb,
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struct devlink_port *dl_port);
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@ -181,17 +181,21 @@ static void mlx5e_disable_async_events(struct mlx5e_priv *priv)
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static int blocking_event(struct notifier_block *nb, unsigned long event, void *data)
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{
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struct mlx5e_priv *priv = container_of(nb, struct mlx5e_priv, blocking_events_nb);
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struct mlx5_devlink_trap_event_ctx *trap_event_ctx = data;
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int err;
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switch (event) {
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case MLX5_DRIVER_EVENT_TYPE_TRAP:
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err = mlx5e_handle_trap_event(priv, data);
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err = mlx5e_handle_trap_event(priv, trap_event_ctx->trap);
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if (err) {
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trap_event_ctx->err = err;
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return NOTIFY_BAD;
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}
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break;
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default:
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netdev_warn(priv->netdev, "Sync event: Unknown event %ld\n", event);
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err = -EINVAL;
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return NOTIFY_DONE;
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}
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return err;
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return NOTIFY_OK;
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}
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static void mlx5e_enable_blocking_events(struct mlx5e_priv *priv)
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@ -5984,7 +5988,7 @@ static int mlx5e_probe(struct auxiliary_device *adev,
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}
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mlx5e_dcbnl_init_app(priv);
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mlx5_uplink_netdev_set(mdev, netdev);
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mlx5_core_uplink_netdev_set(mdev, netdev);
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mlx5e_params_print_info(mdev, &priv->channels.params);
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return 0;
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@ -6008,6 +6012,7 @@ static void mlx5e_remove(struct auxiliary_device *adev)
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struct mlx5e_priv *priv = mlx5e_dev->priv;
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pm_message_t state = {};
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mlx5_core_uplink_netdev_set(priv->mdev, NULL);
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mlx5e_dcbnl_delete_app(priv);
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unregister_netdev(priv->netdev);
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mlx5e_suspend(adev, state);
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@ -424,6 +424,7 @@ int mlx5_blocking_notifier_register(struct mlx5_core_dev *dev, struct notifier_b
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return blocking_notifier_chain_register(&events->sw_nh, nb);
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}
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EXPORT_SYMBOL(mlx5_blocking_notifier_register);
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int mlx5_blocking_notifier_unregister(struct mlx5_core_dev *dev, struct notifier_block *nb)
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{
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@ -431,6 +432,7 @@ int mlx5_blocking_notifier_unregister(struct mlx5_core_dev *dev, struct notifier
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return blocking_notifier_chain_unregister(&events->sw_nh, nb);
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}
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EXPORT_SYMBOL(mlx5_blocking_notifier_unregister);
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int mlx5_blocking_notifier_call_chain(struct mlx5_core_dev *dev, unsigned int event,
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void *data)
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@ -84,11 +84,6 @@ static inline struct net *mlx5_core_net(struct mlx5_core_dev *dev)
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return devlink_net(priv_to_devlink(dev));
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}
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static inline void mlx5_uplink_netdev_set(struct mlx5_core_dev *mdev, struct net_device *netdev)
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{
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mdev->mlx5e_res.uplink_netdev = netdev;
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}
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static inline struct net_device *mlx5_uplink_netdev_get(struct mlx5_core_dev *mdev)
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{
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return mdev->mlx5e_res.uplink_netdev;
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@ -336,6 +336,24 @@ static u16 to_fw_pkey_sz(struct mlx5_core_dev *dev, u32 size)
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}
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}
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void mlx5_core_uplink_netdev_set(struct mlx5_core_dev *dev, struct net_device *netdev)
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{
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mutex_lock(&dev->mlx5e_res.uplink_netdev_lock);
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dev->mlx5e_res.uplink_netdev = netdev;
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mlx5_blocking_notifier_call_chain(dev, MLX5_DRIVER_EVENT_UPLINK_NETDEV,
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netdev);
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mutex_unlock(&dev->mlx5e_res.uplink_netdev_lock);
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}
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void mlx5_core_uplink_netdev_event_replay(struct mlx5_core_dev *dev)
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{
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mutex_lock(&dev->mlx5e_res.uplink_netdev_lock);
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mlx5_blocking_notifier_call_chain(dev, MLX5_DRIVER_EVENT_UPLINK_NETDEV,
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dev->mlx5e_res.uplink_netdev);
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mutex_unlock(&dev->mlx5e_res.uplink_netdev_lock);
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}
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EXPORT_SYMBOL(mlx5_core_uplink_netdev_event_replay);
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static int mlx5_core_get_caps_mode(struct mlx5_core_dev *dev,
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enum mlx5_cap_type cap_type,
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enum mlx5_cap_mode cap_mode)
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@ -1609,6 +1627,7 @@ int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
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lockdep_register_key(&dev->lock_key);
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mutex_init(&dev->intf_state_mutex);
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lockdep_set_class(&dev->intf_state_mutex, &dev->lock_key);
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mutex_init(&dev->mlx5e_res.uplink_netdev_lock);
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mutex_init(&priv->bfregs.reg_head.lock);
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mutex_init(&priv->bfregs.wc_head.lock);
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@ -1697,6 +1716,7 @@ void mlx5_mdev_uninit(struct mlx5_core_dev *dev)
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mutex_destroy(&priv->alloc_mutex);
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mutex_destroy(&priv->bfregs.wc_head.lock);
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mutex_destroy(&priv->bfregs.reg_head.lock);
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mutex_destroy(&dev->mlx5e_res.uplink_netdev_lock);
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mutex_destroy(&dev->intf_state_mutex);
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lockdep_unregister_key(&dev->lock_key);
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}
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@ -362,6 +362,7 @@ enum mlx5_event {
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enum mlx5_driver_event {
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MLX5_DRIVER_EVENT_TYPE_TRAP = 0,
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MLX5_DRIVER_EVENT_UPLINK_NETDEV,
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};
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enum {
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@ -49,6 +49,7 @@
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#include <linux/notifier.h>
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#include <linux/refcount.h>
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#include <linux/auxiliary_bus.h>
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#include <linux/mutex.h>
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#include <linux/mlx5/device.h>
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#include <linux/mlx5/doorbell.h>
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@ -672,6 +673,7 @@ struct mlx5e_resources {
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} hw_objs;
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struct devlink_port dl_port;
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struct net_device *uplink_netdev;
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struct mutex uplink_netdev_lock;
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struct mlx5_crypto_dek_priv *dek_priv;
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};
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|
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@ -1010,6 +1012,9 @@ int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
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void *out, int out_size);
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bool mlx5_cmd_is_down(struct mlx5_core_dev *dev);
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|
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void mlx5_core_uplink_netdev_set(struct mlx5_core_dev *mdev, struct net_device *netdev);
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void mlx5_core_uplink_netdev_event_replay(struct mlx5_core_dev *mdev);
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|
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int mlx5_core_get_caps(struct mlx5_core_dev *dev, enum mlx5_cap_type cap_type);
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||||
void mlx5_health_cleanup(struct mlx5_core_dev *dev);
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||||
int mlx5_health_init(struct mlx5_core_dev *dev);
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||||
|
|
|
|||
|
|
@ -1521,7 +1521,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
|
|||
u8 null_mkey[0x1];
|
||||
u8 log_max_klm_list_size[0x6];
|
||||
|
||||
u8 reserved_at_120[0xa];
|
||||
u8 reserved_at_120[0x2];
|
||||
u8 qpc_extension[0x1];
|
||||
u8 reserved_at_123[0x7];
|
||||
u8 log_max_ra_req_dc[0x6];
|
||||
u8 reserved_at_130[0x2];
|
||||
u8 eth_wqe_too_small[0x1];
|
||||
|
|
@ -1687,7 +1689,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
|
|||
|
||||
u8 log_bf_reg_size[0x5];
|
||||
|
||||
u8 reserved_at_270[0x6];
|
||||
u8 reserved_at_270[0x3];
|
||||
u8 qp_error_syndrome[0x1];
|
||||
u8 reserved_at_274[0x2];
|
||||
u8 lag_dct[0x2];
|
||||
u8 lag_tx_port_affinity[0x1];
|
||||
u8 lag_native_fdb_selection[0x1];
|
||||
|
|
@ -5393,6 +5397,37 @@ struct mlx5_ifc_query_rmp_in_bits {
|
|||
u8 reserved_at_60[0x20];
|
||||
};
|
||||
|
||||
struct mlx5_ifc_cqe_error_syndrome_bits {
|
||||
u8 hw_error_syndrome[0x8];
|
||||
u8 hw_syndrome_type[0x4];
|
||||
u8 reserved_at_c[0x4];
|
||||
u8 vendor_error_syndrome[0x8];
|
||||
u8 syndrome[0x8];
|
||||
};
|
||||
|
||||
struct mlx5_ifc_qp_context_extension_bits {
|
||||
u8 reserved_at_0[0x60];
|
||||
|
||||
struct mlx5_ifc_cqe_error_syndrome_bits error_syndrome;
|
||||
|
||||
u8 reserved_at_80[0x580];
|
||||
};
|
||||
|
||||
struct mlx5_ifc_qpc_extension_and_pas_list_in_bits {
|
||||
struct mlx5_ifc_qp_context_extension_bits qpc_data_extension;
|
||||
|
||||
u8 pas[0][0x40];
|
||||
};
|
||||
|
||||
struct mlx5_ifc_qp_pas_list_in_bits {
|
||||
struct mlx5_ifc_cmd_pas_bits pas[0];
|
||||
};
|
||||
|
||||
union mlx5_ifc_qp_pas_or_qpc_ext_and_pas_bits {
|
||||
struct mlx5_ifc_qp_pas_list_in_bits qp_pas_list;
|
||||
struct mlx5_ifc_qpc_extension_and_pas_list_in_bits qpc_ext_and_pas_list;
|
||||
};
|
||||
|
||||
struct mlx5_ifc_query_qp_out_bits {
|
||||
u8 status[0x8];
|
||||
u8 reserved_at_8[0x18];
|
||||
|
|
@ -5409,7 +5444,7 @@ struct mlx5_ifc_query_qp_out_bits {
|
|||
|
||||
u8 reserved_at_800[0x80];
|
||||
|
||||
u8 pas[][0x40];
|
||||
union mlx5_ifc_qp_pas_or_qpc_ext_and_pas_bits qp_pas_or_qpc_ext_and_pas;
|
||||
};
|
||||
|
||||
struct mlx5_ifc_query_qp_in_bits {
|
||||
|
|
@ -5419,7 +5454,8 @@ struct mlx5_ifc_query_qp_in_bits {
|
|||
u8 reserved_at_20[0x10];
|
||||
u8 op_mod[0x10];
|
||||
|
||||
u8 reserved_at_40[0x8];
|
||||
u8 qpc_ext[0x1];
|
||||
u8 reserved_at_41[0x7];
|
||||
u8 qpn[0x18];
|
||||
|
||||
u8 reserved_at_60[0x20];
|
||||
|
|
@ -8635,7 +8671,8 @@ struct mlx5_ifc_create_qp_in_bits {
|
|||
u8 reserved_at_20[0x10];
|
||||
u8 op_mod[0x10];
|
||||
|
||||
u8 reserved_at_40[0x8];
|
||||
u8 qpc_ext[0x1];
|
||||
u8 reserved_at_41[0x7];
|
||||
u8 input_qpn[0x18];
|
||||
|
||||
u8 reserved_at_60[0x20];
|
||||
|
|
|
|||
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