1bae4dbf95
Extend the SMI with switch (intermediate hop) support. Care has been taken to ensure that the CA (and router) code paths are changed as little as possible. Signed-off-by: Suresh Shelvapille <suri@baymicrosystems.com> Signed-off-by: Hal Rosenstock <halr@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
245 lines
7.2 KiB
C
245 lines
7.2 KiB
C
/*
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* Copyright (c) 2004, 2005 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2004, 2005 Infinicon Corporation. All rights reserved.
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* Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
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* Copyright (c) 2004, 2005 Topspin Corporation. All rights reserved.
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* Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <rdma/ib_smi.h>
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#include "smi.h"
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/*
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* Fixup a directed route SMP for sending
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* Return 0 if the SMP should be discarded
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*/
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enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
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u8 node_type, int port_num)
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{
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u8 hop_ptr, hop_cnt;
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hop_ptr = smp->hop_ptr;
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hop_cnt = smp->hop_cnt;
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/* See section 14.2.2.2, Vol 1 IB spec */
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if (!ib_get_smp_direction(smp)) {
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/* C14-9:1 */
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if (hop_cnt && hop_ptr == 0) {
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smp->hop_ptr++;
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return (smp->initial_path[smp->hop_ptr] ==
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port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-9:2 */
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if (hop_ptr && hop_ptr < hop_cnt) {
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if (node_type != RDMA_NODE_IB_SWITCH)
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return IB_SMI_DISCARD;
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/* smp->return_path set when received */
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smp->hop_ptr++;
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return (smp->initial_path[smp->hop_ptr] ==
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port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-9:3 -- We're at the end of the DR segment of path */
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if (hop_ptr == hop_cnt) {
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/* smp->return_path set when received */
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smp->hop_ptr++;
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return (node_type == RDMA_NODE_IB_SWITCH ||
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smp->dr_dlid == IB_LID_PERMISSIVE ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
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/* C14-9:5 -- Fail unreasonable hop pointer */
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return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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} else {
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/* C14-13:1 */
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if (hop_cnt && hop_ptr == hop_cnt + 1) {
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smp->hop_ptr--;
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return (smp->return_path[smp->hop_ptr] ==
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port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:2 */
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if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
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if (node_type != RDMA_NODE_IB_SWITCH)
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return IB_SMI_DISCARD;
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smp->hop_ptr--;
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return (smp->return_path[smp->hop_ptr] ==
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port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:3 -- at the end of the DR segment of path */
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if (hop_ptr == 1) {
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smp->hop_ptr--;
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/* C14-13:3 -- SMPs destined for SM shouldn't be here */
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return (node_type == RDMA_NODE_IB_SWITCH ||
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smp->dr_slid == IB_LID_PERMISSIVE ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
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if (hop_ptr == 0)
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return IB_SMI_HANDLE;
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/* C14-13:5 -- Check for unreasonable hop pointer */
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return IB_SMI_DISCARD;
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}
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}
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/*
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* Adjust information for a received SMP
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* Return 0 if the SMP should be dropped
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*/
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enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type,
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int port_num, int phys_port_cnt)
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{
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u8 hop_ptr, hop_cnt;
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hop_ptr = smp->hop_ptr;
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hop_cnt = smp->hop_cnt;
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/* See section 14.2.2.2, Vol 1 IB spec */
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if (!ib_get_smp_direction(smp)) {
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/* C14-9:1 -- sender should have incremented hop_ptr */
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if (hop_cnt && hop_ptr == 0)
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return IB_SMI_DISCARD;
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/* C14-9:2 -- intermediate hop */
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if (hop_ptr && hop_ptr < hop_cnt) {
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if (node_type != RDMA_NODE_IB_SWITCH)
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return IB_SMI_DISCARD;
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smp->return_path[hop_ptr] = port_num;
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/* smp->hop_ptr updated when sending */
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return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-9:3 -- We're at the end of the DR segment of path */
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if (hop_ptr == hop_cnt) {
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if (hop_cnt)
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smp->return_path[hop_ptr] = port_num;
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/* smp->hop_ptr updated when sending */
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return (node_type == RDMA_NODE_IB_SWITCH ||
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smp->dr_dlid == IB_LID_PERMISSIVE ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
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/* C14-9:5 -- fail unreasonable hop pointer */
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return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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} else {
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/* C14-13:1 */
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if (hop_cnt && hop_ptr == hop_cnt + 1) {
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smp->hop_ptr--;
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return (smp->return_path[smp->hop_ptr] ==
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port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:2 */
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if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
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if (node_type != RDMA_NODE_IB_SWITCH)
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return IB_SMI_DISCARD;
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/* smp->hop_ptr updated when sending */
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return (smp->return_path[hop_ptr-1] <= phys_port_cnt ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:3 -- We're at the end of the DR segment of path */
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if (hop_ptr == 1) {
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if (smp->dr_slid == IB_LID_PERMISSIVE) {
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/* giving SMP to SM - update hop_ptr */
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smp->hop_ptr--;
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return IB_SMI_HANDLE;
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}
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/* smp->hop_ptr updated when sending */
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return (node_type == RDMA_NODE_IB_SWITCH ?
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IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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/* C14-13:4 -- hop_ptr = 0 -> give to SM */
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/* C14-13:5 -- Check for unreasonable hop pointer */
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return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
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}
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}
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enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
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{
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u8 hop_ptr, hop_cnt;
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hop_ptr = smp->hop_ptr;
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hop_cnt = smp->hop_cnt;
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if (!ib_get_smp_direction(smp)) {
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/* C14-9:2 -- intermediate hop */
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if (hop_ptr && hop_ptr < hop_cnt)
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return IB_SMI_FORWARD;
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/* C14-9:3 -- at the end of the DR segment of path */
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if (hop_ptr == hop_cnt)
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return (smp->dr_dlid == IB_LID_PERMISSIVE ?
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IB_SMI_SEND : IB_SMI_LOCAL);
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/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
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if (hop_ptr == hop_cnt + 1)
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return IB_SMI_SEND;
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} else {
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/* C14-13:2 -- intermediate hop */
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if (2 <= hop_ptr && hop_ptr <= hop_cnt)
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return IB_SMI_FORWARD;
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/* C14-13:3 -- at the end of the DR segment of path */
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if (hop_ptr == 1)
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return (smp->dr_slid != IB_LID_PERMISSIVE ?
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IB_SMI_SEND : IB_SMI_LOCAL);
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}
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return IB_SMI_LOCAL;
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}
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/*
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* Return the forwarding port number from initial_path for outgoing SMP and
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* from return_path for returning SMP
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*/
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int smi_get_fwd_port(struct ib_smp *smp)
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{
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return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
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smp->return_path[smp->hop_ptr-1]);
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}
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