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Multi-port NTB devices permit to share a memory between all accessible peers. Memory Windows API is altered to correspondingly initialize and map memory windows for such devices: ntb_mw_count(pidx); - number of inbound memory windows, which can be allocated for shared buffer with specified peer device. ntb_mw_get_align(pidx, widx); - get alignment and size restriction parameters to properly allocate inbound memory region. ntb_peer_mw_count(); - get number of outbound memory windows. ntb_peer_mw_get_addr(widx); - get mapping address of an outbound memory window If hardware supports inbound translation configured on the local ntb port: ntb_mw_set_trans(pidx, widx); - set translation address of allocated inbound memory window so a peer device could access it. ntb_mw_clear_trans(pidx, widx); - clear the translation address of an inbound memory window. If hardware supports outbound translation configured on the peer ntb port: ntb_peer_mw_set_trans(pidx, widx); - set translation address of a memory window retrieved from a peer device ntb_peer_mw_clear_trans(pidx, widx); - clear the translation address of an outbound memory window Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.