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![]() Ido Schimmel says: ==================== mlxsw: Introduce algorithmic TCAM support The Spectrum-2 ASIC uses an algorithmic TCAM (A-TCAM) where multiple exact matches lookups are performed instead of a single lookup as with standard circuit TCAM (C-TCAM) memory. This allows for higher scale and reduced power consumption. The lookups are performed by masking a packet using different masks (e.g., {dst_ip/24, ethtype}) defined for the region and looking for an exact match. Eventually, the rule with the highest priority will be picked. Since the number of masks per-region is limited, the ASIC includes a C-TCAM that can be used as a spill area for rules that do not fit into the A-TCAM. The driver currently uses a C-TCAM only mode which is similar to Spectrum-1. However, this mode severely limits both the number of supported ACL rules and the performance of the ACL lookup. This patch set introduces initial support for the A-TCAM mode where the C-TCAM is only used for rule spillage. The first five patches add the registers and ASIC resources needed in order to make use of the A-TCAM. Next three patches are the "meat" and add the eRP core which is used to manage the masks used by each ACL region. The individual commit messages are lengthy and aim to thoroughly explain the subject. The next seven patches perform small adjustments in the code and the related data structures and are meant to prepare the code base to the introduction of the A-TCAM in the last two patches. Various A-TCAM optimization will be the focus of follow-up patch sets: * Pruning - Used to reduce the number of lookups. Each rule will include a prune vector that indicates which masks should not be considered for further lookups as they cannot result in a higher priority match * Bloom filter - Used to reduce the number of lookups. Before performing a lookup with a given mask the ASIC will consult a bloom filter (managed by the driver) that indicates whether a match might exist using the considered mask * Masks aggregation - Used to increase scale and reduce lookups. Masks that only differ by up to eight consecutive bits (delta bits) can be aggregated into a single mask. The delta bits then become a part of the rule's key. For example, dst_ip/16 and dst_ip/17 can be represented as dst_ip/16 with a delta bit of one. Rules using the aggregated mask then specify whether the 17-th bit should be masked or not and its value ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.