| /* |
| * 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]); |
| } |
