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92953e7a |
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19-Sep-2023 |
Amit Cohen <amcohen@nvidia.com> |
mlxsw: Edit IPv6 key blocks to use one less block for multicast forwarding
Two ACL regions that are configured by the driver during initialization are
the ones used for IPv4 and IPv6 multicast forwarding. Entries residing
in these two regions match on the {SIP, DIP, VRID} key elements.
Currently for IPv6 region, 9 key blocks are used:
* 4 for SIP - 'ipv4_1', 'ipv6_{3,4,5}'
* 4 for DIP - 'ipv4_0', 'ipv6_{0,1,2/2b}'
* 1 for VRID - 'ipv4_4b'
This can be improved by reducing the amount key blocks needed for
the IPv6 region to 8. It is possible to use key blocks that mix subsets of
the VRID element with subsets of the DIP element.
The following key blocks can be used:
* 4 for SIP - 'ipv4_1', 'ipv6_{3,4,5}'
* 1 for subset of DIP - 'ipv4_0'
* 3 for the rest of DIP and subsets of VRID - 'ipv6_{0,1,2/2b}'
To make this happen, add VRID sub-elements as part of existing keys -
'ipv6_{0,1,2/2b}'. Note that one of the sub-elements is called
VRID_ROUTER_MSB and does not contain bit numbers like the rest, as for
Spectrum < 4 this element represents bits 8-10 and for Spectrum-4 it
represents bits 8-11.
Breaking VRID into 3 sub-elements makes the driver use one less block in
IPv6 region for multicast forwarding. The sub-elements can be filled in
blocks that are used for destination IP.
The algorithm in the driver that chooses which key blocks will be used is
lazy and not the optimal one. It searches the block that contains the most
elements that are required, chooses it, removes the elements that appear
in the chosen block and starts again searching the block that contains the
most elements.
When key block 'ipv4_4' is defined, the algorithm might choose it, as it
contains 2 sub-elements of VRID, then 8 blocks must be chosen for SIP and
DIP and we get 9 blocks to match on {SIP, DIP, VRID}. That is why we had to
remove key block 'ipv4_4' in a previous patch and use key block that
contains one field for VRID.
This improvement was tested and indeed 8 blocks are used instead of 9.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| #
c2f3e10a |
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19-Sep-2023 |
Amit Cohen <amcohen@nvidia.com> |
mlxsw: Add 'ipv4_5' flex key
Currently virtual router ID element is broken to two sub-elements -
'VIRT_ROUTER_LSB' and 'VIRT_ROUTER_MSB'. It was broken as this field is
broken in 'ipv4_4' flex key which is used for IPv4 in Spectrum < 4.
For Spectrum-4, we use 'ipv4_4b' flex key which contains one field for
virtual router, this key is not supported in older ASICs.
Add 'ipv4_5' flex key which is supported in all ASICs and contains one
field for virtual router. Then there is no reason to use 'VIRT_ROUTER_LSB'
and 'VIRT_ROUTER_MSB', remove them and add one element 'VIRT_ROUTER' for
this field.
The motivation is to get rid of 'ipv4_4' flex key, as it might be chosen
for IPv6 multicast forwarding region. This will not allow the improvement
in a following patch. See more details in the cover letter and in a
following patch.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| #
348c976b |
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17-Aug-2023 |
Amit Cohen <amcohen@nvidia.com> |
mlxsw: Fix the size of 'VIRT_ROUTER_MSB'
The field 'virtual router' was extended to 12 bits in Spectrum-4.
Therefore, the element 'MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB' needs 3 bits for
Spectrum < 4 and 4 bits for Spectrum >= 4.
The elements are stored in an internal storage scratchpad. Currently, the
MSB is defined there as 3 bits. It means that for Spectrum-4, only 2K VRFs
can be used for multicast routing, as the highest bit is not really used by
the driver. Fix the definition of 'VIRT_ROUTER_MSB' to use 4 bits. Adjust
the definitions of 'virtual router' field in the blocks accordingly - use
'_avoid_size_check' for Spectrum-2 instead of for Spectrum-4. Fix the mask
in parse function to use 4 bits.
Fixes: 6d5d8ebb881c ("mlxsw: Rename virtual router flex key element")
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/79bed2b70f6b9ed58d4df02e9798a23da648015b.1692268427.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| #
6d5d8ebb |
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06-Jan-2022 |
Amit Cohen <amcohen@nvidia.com> |
mlxsw: Rename virtual router flex key element
In Spectrum-4, the size of the virtual router ACL key element increased
from 11 bits to 12 bits.
In order to reuse the existing virtual router ACL key element
enumerators for Spectrum-4, rename 'VIRT_ROUTER_8_10' and
'VIRT_ROUTER_0_7' to 'VIRT_ROUTER_MSB' and 'VIRT_ROUTER_LSB',
respectively.
No functional changes intended.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| #
cf7221a4 |
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10-Dec-2018 |
Nir Dotan <nird@mellanox.com> |
mlxsw: spectrum_router: Add Multicast routing support for Spectrum-2
Add implementation of Spectrum-2 multicast routes for both IPv4 and IPv6 by
using ACL module explicitly.
In Spectrum-2, multicast routes are set as ACL rules, so initialization
takes care of creating dedicated ACL groups and binding them to the
appropriate multicast routing protocol IPv4/IPv6, and afterwards routes
configuration translates to setting explicit ACL rules.
Signed-off-by: Nir Dotan <nird@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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