| /* | |
| * 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, 2005 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. | |
| * | |
| * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $ | |
| */ | |
| #include <rdma/ib_smi.h> | |
| #include "smi.h" | |
| /* | |
| * Fixup a directed route SMP for sending | |
| * Return 0 if the SMP should be discarded | |
| */ | |
| int 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 */ | |
| 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); | |
| } | |
| /* C14-9:2 */ | |
| if (hop_ptr && hop_ptr < hop_cnt) { | |
| if (node_type != RDMA_NODE_IB_SWITCH) | |
| return 0; | |
| /* smp->return_path set when received */ | |
| smp->hop_ptr++; | |
| return (smp->initial_path[smp->hop_ptr] == | |
| port_num); | |
| } | |
| /* 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); | |
| } | |
| /* 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); | |
| } else { | |
| /* C14-13:1 */ | |
| if (hop_cnt && hop_ptr == hop_cnt + 1) { | |
| smp->hop_ptr--; | |
| return (smp->return_path[smp->hop_ptr] == | |
| port_num); | |
| } | |
| /* C14-13:2 */ | |
| if (2 <= hop_ptr && hop_ptr <= hop_cnt) { | |
| if (node_type != RDMA_NODE_IB_SWITCH) | |
| return 0; | |
| smp->hop_ptr--; | |
| return (smp->return_path[smp->hop_ptr] == | |
| port_num); | |
| } | |
| /* 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); | |
| } | |
| /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ | |
| if (hop_ptr == 0) | |
| return 1; | |
| /* C14-13:5 -- Check for unreasonable hop pointer */ | |
| return 0; | |
| } | |
| } | |
| /* | |
| * Adjust information for a received SMP | |
| * Return 0 if the SMP should be dropped | |
| */ | |
| int 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 */ | |
| if (!ib_get_smp_direction(smp)) { | |
| /* C14-9:1 -- sender should have incremented hop_ptr */ | |
| if (hop_cnt && hop_ptr == 0) | |
| return 0; | |
| /* C14-9:2 -- intermediate hop */ | |
| if (hop_ptr && hop_ptr < hop_cnt) { | |
| if (node_type != RDMA_NODE_IB_SWITCH) | |
| return 0; | |
| smp->return_path[hop_ptr] = port_num; | |
| /* smp->hop_ptr updated when sending */ | |
| return (smp->initial_path[hop_ptr+1] <= phys_port_cnt); | |
| } | |
| /* 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); | |
| } | |
| /* 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); | |
| } else { | |
| /* C14-13:1 */ | |
| if (hop_cnt && hop_ptr == hop_cnt + 1) { | |
| smp->hop_ptr--; | |
| return (smp->return_path[smp->hop_ptr] == | |
| port_num); | |
| } | |
| /* C14-13:2 */ | |
| if (2 <= hop_ptr && hop_ptr <= hop_cnt) { | |
| if (node_type != RDMA_NODE_IB_SWITCH) | |
| return 0; | |
| /* smp->hop_ptr updated when sending */ | |
| return (smp->return_path[hop_ptr-1] <= phys_port_cnt); | |
| } | |
| /* 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 1; | |
| } | |
| /* smp->hop_ptr updated when sending */ | |
| return (node_type == RDMA_NODE_IB_SWITCH); | |
| } | |
| /* C14-13:4 -- hop_ptr = 0 -> give to SM */ | |
| /* C14-13:5 -- Check for unreasonable hop pointer */ | |
| return (hop_ptr == 0); | |
| } | |
| } | |
| /* | |
| * Return 1 if the received DR SMP should be forwarded to the send queue | |
| * Return 0 if the SMP should be completed up the stack | |
| */ | |
| int 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 1; | |
| /* C14-9:3 -- at the end of the DR segment of path */ | |
| if (hop_ptr == hop_cnt) | |
| return (smp->dr_dlid == IB_LID_PERMISSIVE); | |
| /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ | |
| if (hop_ptr == hop_cnt + 1) | |
| return 1; | |
| } else { | |
| /* C14-13:2 */ | |
| if (2 <= hop_ptr && hop_ptr <= hop_cnt) | |
| return 1; | |
| /* C14-13:3 -- at the end of the DR segment of path */ | |
| if (hop_ptr == 1) | |
| return (smp->dr_slid != IB_LID_PERMISSIVE); | |
| } | |
| return 0; | |
| } |