freebsd kernel with SKQ
6f2128c7ed
Two new tables are added to ena_tx_buffer structure: * netmap_map_seg stores DMA mapping structures, * netmap_buf_idx stores buff indexes taken from the slots. When Tx resources are being set, the new mapping structures are created and netmap Tx rings are being reset. When Tx resources are being released, used netmap bufs are unmapped from DMA and then mapping structures are destroyed. When Tx interrupt occurrs, ena_netmap_tx_irq is called. ena_netmap_txsync callback signalizes that there are new packets which should be transmitted. First, it fills ena_netmap_ctx. Then it performs two actions: * ena_netmap_tx_frames moves packets from netmap ring to NIC, * ena_netmap_tx_cleanup restores buffers from NIC and gives them back to the userspace app. 0 is returned in case of Tx error that could be handled by the driver. ena_netmap_tx_frames checks if there are packets ready for transmission. Then, for each of them, ena_netmap_tx_frame is called. If error occurs, transmitting is stopped, but if the error was cause due to HW ring being full, information about that is not propagated to the userspace app. When all packets are ready, doorbell is written to NIC and netmap ring state is updated. Parsing of one packet is done by the ena_netmap_tx_frame function. First, it checks if number of slots does not exceed NIC limit. Invalid packets are being dropped and the error is propagated to the upper layer. As each netmap buffer has equal size, which is typically greater then 2KiB, there shouldn't be any packets which contain too many slots. Then, the ena_com_tx_ctx structure is being filled. As netmap does not support any hardware offloads, ena_com_tx_meta structure is set to zero. After that, ena_netmap_map_slots maps all memory slots for DMA. If the device works in the LLQ mode, the push header is being determined by checking if the header fits within the first socket. If so, the portion of data is being copied directly from the slot. In other case, the data is copied to the intermediate buffer. First slots are treated the same as as the others, because DMA mapping has no impact on LLQ mode. Index of each netmap buffer is taken from slot and stored in netmap_buf_idx array. In case of mapping error, memory is unmapped and packets are put back to the netmap ring. ena_netmap_tx_cleanup performs out of order cleanup of sent buffers. First, req_id is taken and is validated. As validate_tx_req_id from ena.c is specific to kernels mbuf, another implementation is provided. Each req_id is cleaned up by ena_netmap_tx_clean_one function. Buffers are being unmaped from DMA and put back to netmap ring. In the end, state of netmap and NIC rings are being updated. Differential Revision: https://reviews.freebsd.org/D21936 Submitted by: Rafal Kozik <rk@semihalf.com> Michal Krawczyk <mk@semihalf.com> Obtained from: Semihalf Sponsored by: Amazon, Inc. |
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| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| RELNOTES | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
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contrib Packages contributed by 3rd parties.
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Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
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release Release building Makefile & associated tools.
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share Shared resources.
stand Boot loader sources.
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used in release builds. NOTES contains documentation of
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