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Rahul Lakkireddy says: ==================== cxgb4: add support for TC-MQPRIO Qdisc Offload This series of patches add support for offloading TC-MQPRIO Qdisc to Chelsio T5/T6 NICs. Offloading QoS traffic shaping and pacing requires using Ethernet Offload (ETHOFLD) resources available on Chelsio NICs. The ETHOFLD resources are configured by firmware and taken from the resource pool shared with other Chelsio Upper Layer Drivers. Traffic flowing through ETHOFLD region requires a software netdev Tx queue (EOSW_TXQ) exposed to networking stack, and an underlying hardware Tx queue (EOHW_TXQ) used for sending packets through hardware. ETHOFLD region is addressed using EOTIDs, which are per-connection resource. Hence, EOTIDs are capable of storing only a very small number of packets in flight. To allow more connections to share the the QoS rate limiting configuration, multiple EOTIDs must be allocated to reduce packet drops. EOTIDs are 1-to-1 mapped with software EOSW_TXQ. Several software EOSW_TXQs can post packets to a single hardware EOHW_TXQ. The series is broken down as follows: Patch 1 queries firmware for maximum available traffic classes, as well as, start and maximum available indices (EOTID) into ETHOFLD region, supported by the underlying device. Patch 2 reworks queue configuration and simplifies MSI-X allocation logic in preparation for ETHOFLD queues support. Patch 3 adds skeleton for validating and configuring TC-MQPRIO Qdisc offload. Also, adds support for software EOSW_TXQs and exposes them to network stack. Updates Tx queue selection to use fallback NIC Tx path for unsupported traffic that can't go through ETHOFLD queues. Patch 4 adds support for managing hardware queues to rate limit traffic flowing through them. The queues are allocated/removed based on enabling/disabling TC-MQPRIO Qdisc offload, respectively. Patch 5 adds Tx path for traffic flowing through software EOSW_TXQ and EOHW_TXQ. Also, adds Rx path to handle Tx completions. Patch 6 updates exisiting SCHED API to configure FLOWC based QoS offload. In the existing QUEUE based rate limiting, multiple queues sharing a traffic class get the aggreagated max rate limit value. On the other hand, in FLOWC based rate limiting, multiple queues sharing a traffic class get their own individual max rate limit value. For example, if 2 queues are bound to class 0, which is rate limited to 1 Gbps, then in QUEUE based rate limiting, both the queues get the aggregate max output of 1 Gbps only. In FLOWC based rate limiting, each queue gets its own output of max 1 Gbps each; i.e. 2 queues * 1 Gbps rate limit = 2 Gbps max output. ==================== 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.
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.