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Bernard Metzler says: ==================== This patch set contributes the SoftiWarp driver rebased for latest rdma-next. SoftiWarp (siw) implements the iWarp RDMA protocol over kernel TCP sockets. The driver integrates with the linux-rdma framework. A matching userlevel driver is available as PR at https://github.com/linux-rdma/rdma-core/pull/536 Many thanks for reviewing and testing the driver, especially to Leon, Jason, Steve, Doug, Olga, Dennis, Gal. You all helped to significantly improve the driver over the last year. Please find below a list of changes and comments, compared to older versions of the siw driver. Many thanks! Bernard. CHANGES: ======== v3 (this version) ----------------- - Rebased to rdma-next - Removed unneccessary initialization of enums in siw-abi.h - Added comment on sizing of all work queues to power of two. v2 ----------------- - Changed recieve path CRC calculation to compute CRC32c not on target buffer after placement, but on original skbuf. This change severely hurts performance, if CRC is switched on, since skb must now be walked twice. It is planned to work on an extension to skb_copy_bits() to fold in CRC computation. - Moved debugging to using ibdev_dbg(). - Dropped detailed packet debug printing. - Removed siw_debug.[ch] files. - Removed resource tracking, code now relies on restrack of RDMA midlayer. Only object counting to enforce reported device limits is left in place. - Removed all nested switch-case statements. - Cleaned up header file #include's - Moved CQ create/destroy to new semantics, where midlayer creates/destroys containing object. - Set siw's ABI version to 1 (was 0 before) - Removed all enum initialization where not needed. - Fixed MAINTANERS entry for siw driver - This version stays with the current siw specific management of user memory (siw_umem_get() vs. ib_umem_get(), etc.). This, since the current ib_umem implementation is less efficient for user page lookup on the fast path, where effciency is important for a SW RDMA driver. It is planned to contribute enhancements to the ib_umem framework, wich makes it suitable for SW drivers as well. v1 (first version after v9 of siw RFC) -------------------------------------- - Rebased to 5.2-rc1 - All IDR code got removed. - Both MR and QP deallocation verbs now synchronously free the resources referenced by the RDMA mid-layer. - IPv6 support was added. - For compatibility with Chelsio iWarp hardware, the RX path was slightly reworked. It now allows packet intersection between tagged and untagged RDMAP operations. While not a defined behavior as of IETF RFC 5040/5041, some RDMA hardware may intersect an ongoing outbound (large) tagged message, such as an multisegment RDMA Read Response with sending an untagged message, such as an RDMA Send frame. This behavior was only detected in an NVMeF setup, where siw was used at target side, and RDMA hardware at client side (during file write). siw now implements two input paths for tagged and untagged messages each, and allows the intersected placement of both messages. - The siw kernel abi file got renamed from siw_user.h to siw-abi.h. ==================== * branch 'siw': SIW addition to kernel build environment SIW completion queue methods SIW receive path SIW transmit path SIW queue pair methods SIW application buffer management SIW application interface SIW connection management SIW network and RDMA core interface SIW main include file iWarp wire packet format |
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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.