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Commit ee59fa0d authored by Yishai Hadas's avatar Yishai Hadas Committed by Doug Ledford
Browse files

IB/mlx4: Request alias GUID on demand 



Request GIDs from the SM on demand, i.e., when a VF actually needs them,
and release them when the GIDs are no longer in use.

In cloud environments, this is useful for GID migrations, in which a
GID is assigned to a VF on the destination HCA, while the VF on the
source HCA is shutdown (but the GID was not administratively released).

Signed-off-by: default avatarYishai Hadas <yishaih@mellanox.com>
Signed-off-by: default avatarJack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent f5479601

drivers/infiniband/hw/mlx4/alias_GUID.c

+51 −0
Original line number Diff line number Diff line
@@ -123,6 +123,57 @@ ib_sa_comp_mask mlx4_ib_get_aguid_comp_mask_from_ix(int index) 
	return IB_SA_COMP_MASK(4 + index);

}



void mlx4_ib_slave_alias_guid_event(struct mlx4_ib_dev *dev, int slave,

				    int port,  int slave_init)

{

	__be64 curr_guid, required_guid;

	int record_num = slave / 8;

	int index = slave % 8;

	int port_index = port - 1;

	unsigned long flags;

	int do_work = 0;



	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags);

	if (dev->sriov.alias_guid.ports_guid[port_index].state_flags &

	    GUID_STATE_NEED_PORT_INIT)

		goto unlock;

	if (!slave_init) {

		curr_guid = *(__be64 *)&dev->sriov.

			alias_guid.ports_guid[port_index].

			all_rec_per_port[record_num].

			all_recs[GUID_REC_SIZE * index];

		if (curr_guid == cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL) ||

		    !curr_guid)

			goto unlock;

		required_guid = cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL);

	} else {

		required_guid = mlx4_get_admin_guid(dev->dev, slave, port);

		if (required_guid == cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL))

			goto unlock;

	}

	*(__be64 *)&dev->sriov.alias_guid.ports_guid[port_index].

		all_rec_per_port[record_num].

		all_recs[GUID_REC_SIZE * index] = required_guid;

	dev->sriov.alias_guid.ports_guid[port_index].

		all_rec_per_port[record_num].guid_indexes

		|= mlx4_ib_get_aguid_comp_mask_from_ix(index);

	dev->sriov.alias_guid.ports_guid[port_index].

		all_rec_per_port[record_num].status

		= MLX4_GUID_INFO_STATUS_IDLE;

	/* set to run immediately */

	dev->sriov.alias_guid.ports_guid[port_index].

		all_rec_per_port[record_num].time_to_run = 0;

	dev->sriov.alias_guid.ports_guid[port_index].

		all_rec_per_port[record_num].

		guids_retry_schedule[index] = 0;

	do_work = 1;

unlock:

	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags);



	if (do_work)

		mlx4_ib_init_alias_guid_work(dev, port_index);

}



/*

 * Whenever new GUID is set/unset (guid table change) create event and

 * notify the relevant slave (master also should be notified).

drivers/infiniband/hw/mlx4/main.c

+22 −0
Original line number Diff line number Diff line
@@ -2791,9 +2791,31 @@ static void mlx4_ib_event(struct mlx4_dev *dev, void *ibdev_ptr, 
	case MLX4_DEV_EVENT_SLAVE_INIT:

		/* here, p is the slave id */

		do_slave_init(ibdev, p, 1);

		if (mlx4_is_master(dev)) {

			int i;



			for (i = 1; i <= ibdev->num_ports; i++) {

				if (rdma_port_get_link_layer(&ibdev->ib_dev, i)

					== IB_LINK_LAYER_INFINIBAND)

					mlx4_ib_slave_alias_guid_event(ibdev,

								       p, i,

								       1);

			}

		}

		return;



	case MLX4_DEV_EVENT_SLAVE_SHUTDOWN:

		if (mlx4_is_master(dev)) {

			int i;



			for (i = 1; i <= ibdev->num_ports; i++) {

				if (rdma_port_get_link_layer(&ibdev->ib_dev, i)

					== IB_LINK_LAYER_INFINIBAND)

					mlx4_ib_slave_alias_guid_event(ibdev,

								       p, i,

								       0);

			}

		}

		/* here, p is the slave id */

		do_slave_init(ibdev, p, 0);

		return;

drivers/infiniband/hw/mlx4/mlx4_ib.h

+2 −0
Original line number Diff line number Diff line
@@ -798,6 +798,8 @@ int add_sysfs_port_mcg_attr(struct mlx4_ib_dev *device, int port_num, 
void del_sysfs_port_mcg_attr(struct mlx4_ib_dev *device, int port_num,

			     struct attribute *attr);

ib_sa_comp_mask mlx4_ib_get_aguid_comp_mask_from_ix(int index);

void mlx4_ib_slave_alias_guid_event(struct mlx4_ib_dev *dev, int slave,

				    int port, int slave_init);



int mlx4_ib_device_register_sysfs(struct mlx4_ib_dev *device) ;