bnxt_re/lib: Add uverbs object handle path for CQ/SRQ toggle page#1761
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bnxt_re/lib: Add uverbs object handle path for CQ/SRQ toggle page#1761selvintxavier wants to merge 2 commits into
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Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
The kernel driver supports two paths for the GET_TOGGLE_MEM ioctl: - Legacy path (older kernels / older rdma-core): the caller sends BNXT_RE_TOGGLE_MEM_TYPE (enum: CQ or SRQ) and BNXT_RE_TOGGLE_MEM_RES_ID (the hardware queue ID). The kernel performs an XArray lookup per ucontext to find the toggle page. - New path (new kernel + new rdma-core): the caller sends a uverbs object handle (BNXT_RE_TOGGLE_MEM_CQ_HANDLE or BNXT_RE_TOGGLE_MEM_SRQ_HANDLE). The kernel resolves the uobject directly, with built-in ownership verification and pinning. During alloc_ucontext, lib now sets the new request bit BNXT_RE_COMP_MASK_REQ_UCNTX_TOGGLE_MEM_UOBJ_SUPPORT to advertise uobj-handle capability. If the kernel responds with BNXT_RE_UCNTX_CMASK_TOGGLE_MEM_UOBJ_SUPPORT. Based on the negotiated capability, new path will be selected. Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
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The kernel driver supports two paths for the GET_TOGGLE_MEM ioctl: