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linux/drivers/infiniband/core/smi.c
Mark Bloch 1fb7f8973f RDMA: Support more than 255 rdma ports 
Current code uses many different types when dealing with a port of a RDMA
device: u8, unsigned int and u32. Switch to u32 to clean up the logic.

This allows us to make (at least) the core view consistent and use the
same type. Unfortunately not all places can be converted. Many uverbs
functions expect port to be u8 so keep those places in order not to break
UAPIs.  HW/Spec defined values must also not be changed.

With the switch to u32 we now can support devices with more than 255
ports. U32_MAX is reserved to make control logic a bit easier to deal
with. As a device with U32_MAX ports probably isn't going to happen any
time soon this seems like a non issue.

When a device with more than 255 ports is created uverbs will report the
RDMA device as having 255 ports as this is the max currently supported.

The verbs interface is not changed yet because the IBTA spec limits the
port size in too many places to be u8 and all applications that relies in
verbs won't be able to cope with this change. At this stage, we are
extending the interfaces that are using vendor channel solely

Once the limitation is lifted mlx5 in switchdev mode will be able to have
thousands of SFs created by the device. As the only instance of an RDMA
device that reports more than 255 ports will be a representor device and
it exposes itself as a RAW Ethernet only device CM/MAD/IPoIB and other
ULPs aren't effected by this change and their sysfs/interfaces that are
exposes to userspace can remain unchanged.

While here cleanup some alignment issues and remove unneeded sanity
checks (mainly in rdmavt),

Link: https://lore.kernel.org/r/20210301070420.439400-1-leon@kernel.org
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2021-03-26 09:31:21 -03:00

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/*
* 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, u32 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;
}
}
/*
* 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, u32 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);
}
enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
bool is_switch, u32 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);
}
static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, u32 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);
}
}
/*
* 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,
u32 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);
}
/*
* 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,
u32 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);
}
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;
}
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);
}
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);
}
/*
* 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]);
}
/*
* 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];
}
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