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d33ec45250
One of the classification action that can be performed is to compute a
hash of the packet header based on some header fields, and lookup a RSS
table based on this hash to determine the final RxQ.
This is done by adding one lookup entry per flow per port, so that we
can configure the hash generation parameters for each flow and each
port.
There are 2 possible engines that can be used for RSS hash generation :
- C3HA, that generates a hash based on up to 4 header-extracted fields
- C3HB, that does the same as c3HA, but also includes L4 info in the hash
There are a lot of fields that can be extracted from the header. For now,
we only use the ones that we can configure using ethtool :
- DST MAC address
- L3 info
- Source IP
- Destination IP
- Source port
- Destination port
The C3HB engine is selected when we use L4 fields (src/dst port).
Header parser Dec table
Ingress pkt +-------------+ flow id +----------------------------+
------------->| TCAM + SRAM |-------->|TCP IPv4 w/ VLAN, not frag |
+-------------+ |TCP IPv4 w/o VLAN, not frag |
|TCP IPv4 w/ VLAN, frag |--+
|etc. | |
+----------------------------+ |
|
Flow table |
+---------+ +------------+ +--------------------------+ |
| RSS tbl |<--| Classifier |<--------| flow 0: C2 lookup | |
+---------+ +------------+ | C3 lookup port 0 | |
| | | C3 lookup port 1 | |
+-----------+ +-------------+ | ... | |
| C2 engine | | C3H engines | | flow 1: C2 lookup |<--+
+-----------+ +-------------+ | C3 lookup port 0 |
| ... |
| ... |
| flow 51 : C2 lookup |
| ... |
+--------------------------+
The C2 engine also gains the role of enabling and disabling the RSS
table lookup for this packet.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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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.