cregit-Linux how code gets into the kernel

Release 4.11 drivers/infiniband/core/smi.c

/*
 * 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.
 * Copyright (c) 2014 Intel Corporation.  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"
#include "opa_smi.h"


static enum smi_action __smi_handle_dr_smp_send(bool is_switch, int port_num, u8 *hop_ptr, u8 hop_cnt, const u8 *initial_path, const u8 *return_path, u8 direction, bool dr_dlid_is_permissive, bool dr_slid_is_permissive) { /* 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 (!direction) { /* C14-9:1 */ if (hop_cnt && *hop_ptr == 0) { (*hop_ptr)++; return (initial_path[*hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:2 */ if (*hop_ptr && *hop_ptr < hop_cnt) { if (!is_switch) return IB_SMI_DISCARD; /* return_path set when received */ (*hop_ptr)++; return (initial_path[*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) { /* return_path set when received */ (*hop_ptr)++; return (is_switch || dr_dlid_is_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) { (*hop_ptr)--; return (return_path[*hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:2 */ if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) { if (!is_switch) return IB_SMI_DISCARD; (*hop_ptr)--; return (return_path[*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) { (*hop_ptr)--; /* C14-13:3 -- SMPs destined for SM shouldn't be here */ return (is_switch || dr_slid_is_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; } }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier19664.90%240.00%
Ira Weiny6421.19%120.00%
Hal Rosenstock4213.91%240.00%
Total302100.00%5100.00%

/* * Fixup a directed route SMP for sending * Return IB_SMI_DISCARD if the SMP should be discarded */
enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp, bool is_switch, int port_num) { return __smi_handle_dr_smp_send(is_switch, port_num, &smp->hop_ptr, smp->hop_cnt, smp->initial_path, smp->return_path, ib_get_smp_direction(smp), smp->dr_dlid == IB_LID_PERMISSIVE, smp->dr_slid == IB_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny5694.92%150.00%
Hal Rosenstock35.08%150.00%
Total59100.00%2100.00%


enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp, bool is_switch, int port_num) { return __smi_handle_dr_smp_send(is_switch, port_num, &smp->hop_ptr, smp->hop_cnt, smp->route.dr.initial_path, smp->route.dr.return_path, opa_get_smp_direction(smp), smp->route.dr.dr_dlid == OPA_LID_PERMISSIVE, smp->route.dr.dr_slid == OPA_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny7296.00%150.00%
Hal Rosenstock34.00%150.00%
Total75100.00%2100.00%


static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, int port_num, int phys_port_cnt, u8 *hop_ptr, u8 hop_cnt, const u8 *initial_path, u8 *return_path, u8 direction, bool dr_dlid_is_permissive, bool dr_slid_is_permissive) { /* 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 (!direction) { /* 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 (!is_switch) return IB_SMI_DISCARD; return_path[*hop_ptr] = port_num; /* hop_ptr updated when sending */ return (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) return_path[*hop_ptr] = port_num; /* hop_ptr updated when sending */ return (is_switch || dr_dlid_is_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) { (*hop_ptr)--; return (return_path[*hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:2 */ if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) { if (!is_switch) return IB_SMI_DISCARD; /* hop_ptr updated when sending */ return (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 (dr_slid_is_permissive) { /* giving SMP to SM - update hop_ptr */ (*hop_ptr)--; return IB_SMI_HANDLE; } /* hop_ptr updated when sending */ return (is_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); } }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier20267.79%240.00%
Ira Weiny5418.12%120.00%
Hal Rosenstock4214.09%240.00%
Total298100.00%5100.00%

/* * Adjust information for a received SMP * Return IB_SMI_DISCARD if the SMP should be dropped */
enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch, int port_num, int phys_port_cnt) { return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt, &smp->hop_ptr, smp->hop_cnt, smp->initial_path, smp->return_path, ib_get_smp_direction(smp), smp->dr_dlid == IB_LID_PERMISSIVE, smp->dr_slid == IB_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny6195.31%150.00%
Hal Rosenstock34.69%150.00%
Total64100.00%2100.00%

/* * Adjust information for a received SMP * Return IB_SMI_DISCARD if the SMP should be dropped */
enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch, int port_num, int phys_port_cnt) { return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt, &smp->hop_ptr, smp->hop_cnt, smp->route.dr.initial_path, smp->route.dr.return_path, opa_get_smp_direction(smp), smp->route.dr.dr_dlid == OPA_LID_PERMISSIVE, smp->route.dr.dr_slid == OPA_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny7796.25%150.00%
Hal Rosenstock33.75%150.00%
Total80100.00%2100.00%


static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt, u8 direction, bool dr_dlid_is_permissive, bool dr_slid_is_permissive) { if (!direction) { /* 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 (dr_dlid_is_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 (!dr_slid_is_permissive ? IB_SMI_SEND : IB_SMI_LOCAL); } return IB_SMI_LOCAL; }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier7267.92%125.00%
Ira Weiny1917.92%125.00%
Hal Rosenstock1514.15%250.00%
Total106100.00%4100.00%


enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp) { return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt, ib_get_smp_direction(smp), smp->dr_dlid == IB_LID_PERMISSIVE, smp->dr_slid == IB_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny40100.00%1100.00%
Total40100.00%1100.00%


enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp) { return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt, opa_get_smp_direction(smp), smp->route.dr.dr_dlid == OPA_LID_PERMISSIVE, smp->route.dr.dr_slid == OPA_LID_PERMISSIVE); }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny48100.00%1100.00%
Total48100.00%1100.00%

/* * 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]); }

Contributors

PersonTokensPropCommitsCommitProp
Hal Rosenstock41100.00%1100.00%
Total41100.00%1100.00%

/* * Return the forwarding port number from initial_path for outgoing SMP and * from return_path for returning SMP */
int opa_smi_get_fwd_port(struct opa_smp *smp) { return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] : smp->route.dr.return_path[smp->hop_ptr-1]; }

Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny47100.00%1100.00%
Total47100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Ira Weiny54646.47%436.36%
Roland Dreier47340.26%327.27%
Hal Rosenstock15313.02%327.27%
Tom Duffy30.26%19.09%
Total1175100.00%11100.00%
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