[PATCH rdma-next 18/29] IB/rxe: Add multicast infrastructure

Moni Shoua
2016-06-02T16:57:26Z

Functions for use by the multicast attach and detach verbs.

Signed-off-by: Kamal Heib <kamalh-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/rxe/rxe_mcast.c | 190 ++++++++++++++++++++++++++++++++++
1 file changed, 190 insertions(+)
create mode 100644 drivers/infiniband/hw/rxe/rxe_mcast.c

diff --git a/drivers/infiniband/hw/rxe/rxe_mcast.c b/drivers/infiniband/hw/rxe/rxe_mcast.c
new file mode 100644
index 0000000..fa95544
--- /dev/null
+++ b/drivers/infiniband/hw/rxe/rxe_mcast.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
+ struct rxe_mc_grp **grp_p)
+{
+ int err;
+ struct rxe_mc_grp *grp;
+
+ if (rxe->attr.max_mcast_qp_attach == 0) {
+ err = -EINVAL;
+ goto err1;
+ }
+
+ grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
+ if (grp)
+ goto done;
+
+ grp = rxe_alloc(&rxe->mc_grp_pool);
+ if (!grp) {
+ err = -ENOMEM;
+ goto err1;
+ }
+
+ INIT_LIST_HEAD(&grp->qp_list);
+ spin_lock_init(&grp->mcg_lock);
+ grp->rxe = rxe;
+
+ rxe_add_key(grp, mgid);
+
+ err = rxe->ifc_ops->mcast_add(rxe, mgid);
+ if (err)
+ goto err2;
+
+done:
+ *grp_p = grp;
+ return 0;
+
+err2:
+ rxe_drop_ref(grp);
+err1:
+ return err;
+}
+
+int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
+ struct rxe_mc_grp *grp)
+{
+ int err;
+ struct rxe_mc_elem *elem;
+
+ /* check to see of the qp is already a member of the group */
+ spin_lock_bh(&qp->grp_lock);
+ spin_lock_bh(&grp->mcg_lock);
+ list_for_each_entry(elem, &grp->qp_list, qp_list) {
+ if (elem->qp == qp) {
+ err = 0;
+ goto out;
+ }
+ }
+
+ if (grp->num_qp >= rxe->attr.max_mcast_qp_attach) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ elem = rxe_alloc(&rxe->mc_elem_pool);
+ if (!elem) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* each qp holds a ref on the grp */
+ rxe_add_ref(grp);
+
+ grp->num_qp++;
+ elem->qp = qp;
+ elem->grp = grp;
+
+ list_add(&elem->qp_list, &grp->qp_list);
+ list_add(&elem->grp_list, &qp->grp_list);
+
+ err = 0;
+out:
+ spin_unlock_bh(&grp->mcg_lock);
+ spin_unlock_bh(&qp->grp_lock);
+ return err;
+}
+
+int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
+ union ib_gid *mgid)
+{
+ struct rxe_mc_grp *grp;
+ struct rxe_mc_elem *elem, *tmp;
+
+ grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
+ if (!grp)
+ goto err1;
+
+ spin_lock_bh(&qp->grp_lock);
+ spin_lock_bh(&grp->mcg_lock);
+
+ list_for_each_entry_safe(elem, tmp, &grp->qp_list, qp_list) {
+ if (elem->qp == qp) {
+ list_del(&elem->qp_list);
+ list_del(&elem->grp_list);
+ grp->num_qp--;
+
+ spin_unlock_bh(&grp->mcg_lock);
+ spin_unlock_bh(&qp->grp_lock);
+ rxe_drop_ref(elem);
+ rxe_drop_ref(grp); /* ref held by QP */
+ rxe_drop_ref(grp); /* ref from get_key */
+ return 0;
+ }
+ }
+
+ spin_unlock_bh(&grp->mcg_lock);
+ spin_unlock_bh(&qp->grp_lock);
+ rxe_drop_ref(grp); /* ref from get_key */
+err1:
+ return -EINVAL;
+}
+
+void rxe_drop_all_mcast_groups(struct rxe_qp *qp)
+{
+ struct rxe_mc_grp *grp;
+ struct rxe_mc_elem *elem;
+
+ while (1) {
+ spin_lock_bh(&qp->grp_lock);
+ if (list_empty(&qp->grp_list)) {
+ spin_unlock_bh(&qp->grp_lock);
+ break;
+ }
+ elem = list_first_entry(&qp->grp_list, struct rxe_mc_elem,
+ grp_list);
+ list_del(&elem->grp_list);
+ spin_unlock_bh(&qp->grp_lock);
+
+ grp = elem->grp;
+ spin_lock_bh(&grp->mcg_lock);
+ list_del(&elem->qp_list);
+ grp->num_qp--;
+ spin_unlock_bh(&grp->mcg_lock);
+ rxe_drop_ref(grp);
+ rxe_drop_ref(elem);
+ }
+}
+
+void rxe_mc_cleanup(void *arg)
+{
+ struct rxe_mc_grp *grp = arg;
+ struct rxe_dev *rxe = grp->rxe;
+
+ rxe_drop_key(grp);
+ rxe->ifc_ops->mcast_delete(rxe, &grp->mgid);
+}
--
1.8.3.1