--- /dev/null
+/*
+ * Copyright (c) 2004, 2005 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2004, 2005 Infinicon Corporation. All rights reserved.
+ * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
+ * Copyright (c) 2004, 2005 Topspin Corporation. All rights reserved.
+ * Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, 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 <rdma/ib_smi.h>
+#include "smi.h"
+
+/*
+ * Fixup a directed route SMP for sending
+ * Return 0 if the SMP should be discarded
+ */
+enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
+ u8 node_type, int port_num)
+{
+ u8 hop_ptr, hop_cnt;
+
+ hop_ptr = smp->hop_ptr;
+ hop_cnt = smp->hop_cnt;
+
+ /* See section 14.2.2.2, Vol 1 IB spec */
+ /* C14-6 -- valid hop_cnt values are from 0 to 63 */
+ if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
+ return IB_SMI_DISCARD;
+
+ if (!ib_get_smp_direction(smp)) {
+ /* C14-9:1 */
+ if (hop_cnt && hop_ptr == 0) {
+ smp->hop_ptr++;
+ return (smp->initial_path[smp->hop_ptr] ==
+ port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-9:2 */
+ if (hop_ptr && hop_ptr < hop_cnt) {
+ if (node_type != RDMA_NODE_IB_SWITCH)
+ return IB_SMI_DISCARD;
+
+ /* smp->return_path set when received */
+ smp->hop_ptr++;
+ return (smp->initial_path[smp->hop_ptr] ==
+ port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-9:3 -- We're at the end of the DR segment of path */
+ if (hop_ptr == hop_cnt) {
+ /* smp->return_path set when received */
+ smp->hop_ptr++;
+ return (node_type == RDMA_NODE_IB_SWITCH ||
+ smp->dr_dlid == IB_LID_PERMISSIVE ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+ /* C14-9:5 -- Fail unreasonable hop pointer */
+ return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+
+ } else {
+ /* C14-13:1 */
+ if (hop_cnt && hop_ptr == hop_cnt + 1) {
+ smp->hop_ptr--;
+ return (smp->return_path[smp->hop_ptr] ==
+ port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:2 */
+ if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
+ if (node_type != RDMA_NODE_IB_SWITCH)
+ return IB_SMI_DISCARD;
+
+ smp->hop_ptr--;
+ return (smp->return_path[smp->hop_ptr] ==
+ port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:3 -- at the end of the DR segment of path */
+ if (hop_ptr == 1) {
+ smp->hop_ptr--;
+ /* C14-13:3 -- SMPs destined for SM shouldn't be here */
+ return (node_type == RDMA_NODE_IB_SWITCH ||
+ smp->dr_slid == IB_LID_PERMISSIVE ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
+ if (hop_ptr == 0)
+ return IB_SMI_HANDLE;
+
+ /* C14-13:5 -- Check for unreasonable hop pointer */
+ return IB_SMI_DISCARD;
+ }
+}
+
+/*
+ * Adjust information for a received SMP
+ * Return 0 if the SMP should be dropped
+ */
+enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type,
+ int port_num, int phys_port_cnt)
+{
+ u8 hop_ptr, hop_cnt;
+
+ hop_ptr = smp->hop_ptr;
+ hop_cnt = smp->hop_cnt;
+
+ /* See section 14.2.2.2, Vol 1 IB spec */
+ /* C14-6 -- valid hop_cnt values are from 0 to 63 */
+ if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
+ return IB_SMI_DISCARD;
+
+ if (!ib_get_smp_direction(smp)) {
+ /* C14-9:1 -- sender should have incremented hop_ptr */
+ if (hop_cnt && hop_ptr == 0)
+ return IB_SMI_DISCARD;
+
+ /* C14-9:2 -- intermediate hop */
+ if (hop_ptr && hop_ptr < hop_cnt) {
+ if (node_type != RDMA_NODE_IB_SWITCH)
+ return IB_SMI_DISCARD;
+
+ smp->return_path[hop_ptr] = port_num;
+ /* smp->hop_ptr updated when sending */
+ return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-9:3 -- We're at the end of the DR segment of path */
+ if (hop_ptr == hop_cnt) {
+ if (hop_cnt)
+ smp->return_path[hop_ptr] = port_num;
+ /* smp->hop_ptr updated when sending */
+
+ return (node_type == RDMA_NODE_IB_SWITCH ||
+ smp->dr_dlid == IB_LID_PERMISSIVE ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+ /* C14-9:5 -- fail unreasonable hop pointer */
+ return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+
+ } else {
+
+ /* C14-13:1 */
+ if (hop_cnt && hop_ptr == hop_cnt + 1) {
+ smp->hop_ptr--;
+ return (smp->return_path[smp->hop_ptr] ==
+ port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:2 */
+ if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
+ if (node_type != RDMA_NODE_IB_SWITCH)
+ return IB_SMI_DISCARD;
+
+ /* smp->hop_ptr updated when sending */
+ return (smp->return_path[hop_ptr-1] <= phys_port_cnt ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:3 -- We're at the end of the DR segment of path */
+ if (hop_ptr == 1) {
+ if (smp->dr_slid == IB_LID_PERMISSIVE) {
+ /* giving SMP to SM - update hop_ptr */
+ smp->hop_ptr--;
+ return IB_SMI_HANDLE;
+ }
+ /* smp->hop_ptr updated when sending */
+ return (node_type == RDMA_NODE_IB_SWITCH ?
+ IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+
+ /* C14-13:4 -- hop_ptr = 0 -> give to SM */
+ /* C14-13:5 -- Check for unreasonable hop pointer */
+ return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
+ }
+}
+
+enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
+{
+ u8 hop_ptr, hop_cnt;
+
+ hop_ptr = smp->hop_ptr;
+ hop_cnt = smp->hop_cnt;
+
+ if (!ib_get_smp_direction(smp)) {
+ /* C14-9:2 -- intermediate hop */
+ if (hop_ptr && hop_ptr < hop_cnt)
+ return IB_SMI_FORWARD;
+
+ /* C14-9:3 -- at the end of the DR segment of path */
+ if (hop_ptr == hop_cnt)
+ return (smp->dr_dlid == IB_LID_PERMISSIVE ?
+ IB_SMI_SEND : IB_SMI_LOCAL);
+
+ /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
+ if (hop_ptr == hop_cnt + 1)
+ return IB_SMI_SEND;
+ } else {
+ /* C14-13:2 -- intermediate hop */
+ if (2 <= hop_ptr && hop_ptr <= hop_cnt)
+ return IB_SMI_FORWARD;
+
+ /* C14-13:3 -- at the end of the DR segment of path */
+ if (hop_ptr == 1)
+ return (smp->dr_slid != IB_LID_PERMISSIVE ?
+ IB_SMI_SEND : IB_SMI_LOCAL);
+ }
+ return IB_SMI_LOCAL;
+}
+
+/*
+ * Return the forwarding port number from initial_path for outgoing SMP and
+ * from return_path for returning SMP
+ */
+int smi_get_fwd_port(struct ib_smp *smp)
+{
+ return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
+ smp->return_path[smp->hop_ptr-1]);
+}
Code Review / kvmfornfv.git / blobdiff