kernel/git/stable/linux.git/include/rdma/ib_verbs.h, branch master

RDMA/core: Add Completion Counters to resource tracking

2026-07-22T09:45:47+00:00

Track completion counter objects in the resource tracking database so they are visible through the rdma netlink interface. The rdma tool displays the comp_cntr count in the resource summary. Add RDMA_RESTRACK_COMP_CNTR type, embed rdma_restrack_entry in ib_comp_cntr, and add the res_to_dev mapping. Register the resource on create and remove it on destroy. Reviewed-by: Yonatan Nachum Signed-off-by: Michael Margolin Link: https://patch.msgid.link/20260722083603.30334-5-mrgolin@amazon.com Signed-off-by: Leon Romanovsky

RDMA/core: Expose Completion Counter capabilities to userspace

2026-07-22T09:45:47+00:00

Add a dedicated query interface for completion counter capabilities via UVERBS_METHOD_QUERY_COMP_CNTR_CAPS on the device object. The query returns the maximum number of counters, maximum counter value, and a bitmask of supported QP attach operations. Each field is an optional ioctl attribute, allowing userspace to request only the capabilities it needs. Drivers implement the query_comp_cntr_caps operation to report device-specific capabilities. Reviewed-by: Yonatan Nachum Signed-off-by: Michael Margolin Link: https://patch.msgid.link/20260722083603.30334-4-mrgolin@amazon.com Signed-off-by: Leon Romanovsky

RDMA/core: Prevent destroying in-use completion counters

2026-07-22T09:45:47+00:00

Reject comp_cntr destroy while it is attached to any QP. Track attachments using an xarray in ib_qp keyed by the attach op_mask. Use op bitmask to reject overlapping attaches early. Reviewed-by: Yonatan Nachum Signed-off-by: Michael Margolin Link: https://patch.msgid.link/20260722083603.30334-3-mrgolin@amazon.com Signed-off-by: Leon Romanovsky

RDMA/core: Add Completion Counters support

2026-07-22T09:45:47+00:00

Add core infrastructure for Completion Counters, a light-weight alternative to polling CQ for tracking operation completions. Define the UVERBS_OBJECT_COMP_CNTR ioctl object with create, destroy, modify and read methods for both success and error counters. Add a QP attach method on the QP object to associate a completion counter with a queue pair. Add ib_comp_cntr struct, ib_comp_cntr_attach_attr, device ops, and DECLARE_RDMA_OBJ_SIZE for driver object allocation. Only userspace Completion Counters are supported at this stage. Reviewed-by: Yonatan Nachum Signed-off-by: Michael Margolin Link: https://patch.msgid.link/20260722083603.30334-2-mrgolin@amazon.com Signed-off-by: Leon Romanovsky

RDMA: Change capability fields in ib_device_attr from int to u32

2026-07-12T08:47:44+00:00

The capability counter fields in struct ib_device_attr are declared as signed int, but these values are inherently non-negative. Drivers maintain their cached caps as u32 and assign them directly into these int fields; if a cap exceeds INT_MAX the implicit narrowing yields a negative value visible to the IB core. Change the signed int capability fields to u32 to match the underlying nature of the data. Also update consumers across the IB core, ULPs, NVMe-oF target, RDS, and NFS/RDMA so the new u32 values are not forced back through signed int or u8 via min()/min_t() or narrowing local variables. The nvmet-rdma consumer of max_srq clamps it against ib_device.num_comp_vectors, which stays a signed int, so that site uses min_t() instead of min() to handle the signed/unsigned mismatch. Suggested-by: Jason Gunthorpe Signed-off-by: Erni Sri Satya Vennela Link: https://patch.msgid.link/20260709055211.2498307-1-ernis@linux.microsoft.com Reviewed-by: Andy Shevchenko Acked-by: Stefan Metzmacher # smbdirect Signed-off-by: Leon Romanovsky

RDMA/nldev: Fix locking when accessing mr->pd

2026-06-08T17:32:43+00:00

Sashiko points out that, due to rereg_mr, the PD is actually variable and all the touches in nldev are racy. Use mr->device instead of mr->pd->device. Getting the PD restrack ID is more tricky. To avoid disturbing all the happy paths, add an rdma_restrack_sync() operation which is sort of like flush_workqueue() or synchronize_irq(): after it returns, all the old nldev touches to the mr are gone and everything sees the new PD. This makes it safe to reach into the PD pointer. Fixes: da5c85078215 ("RDMA/nldev: add driver-specific resource tracking") Link: https://patch.msgid.link/r/4-v1-29ebd2c229b5+fd5-ib_mr_pd_jgg@nvidia.com Signed-off-by: Jason Gunthorpe

RDMA/uverbs: Expose CoCo DMA bounce requirement to userspace

2026-05-29T23:27:29+00:00

In CoCo guests, guest memory is encrypted and untrusted (T=0) devices cannot DMA to it directly; such transfers must go through unencrypted bounce buffers. RDMA registers user pages for direct device access, bypassing the DMA layer and thus any bouncing, so registered memory does not work in this configuration. Until trusted (T=1) device detection is available, conservatively flag every device attached to a CoCo guest. Expose the condition to userspace as IB_UVERBS_DEVICE_CC_DMA_BOUNCE in device_cap_flags_ex so applications can avoid memory registration and fall back to copying buffers through send/recv. Link: https://patch.msgid.link/r/20260517141311.2409230-2-jiri@resnulli.us Signed-off-by: Jiri Pirko Signed-off-by: Jason Gunthorpe

RDMA/uverbs: Remove legacy umem field from struct ib_cq

2026-05-29T23:19:59+00:00

Now that all drivers use helper to get umem and manage the lifetime, legacy umem field in struct ib_cq is no longer needed. Remove it along with ib_umem_get_cq_tmp() helper that populated it and both error and destroy paths. Link: https://patch.msgid.link/r/20260529134312.2836341-12-jiri@resnulli.us Signed-off-by: Jiri Pirko Signed-off-by: Jason Gunthorpe

RDMA/core: Do not compile ib_core_uverbs without USER_ACCESS

2026-05-26T13:07:25+00:00

Remove the entire ib_core_uverbs.c from the build if CONFIG_INFINIBAND_USER_ACCESS is not set. These functions are only used to support uverbs and are never callable even if they happen to get linked in. Provide inlines for the missing ones to return errors to further push code elimination in drivers. Link: https://patch.msgid.link/r/1-v3-43aba1969751+1988-ib_uverbs_support_ko_jgg@nvidia.com Signed-off-by: Jason Gunthorpe

RDMA: Properly propagate the number of CQEs as unsigned int

2026-03-30T17:47:44+00:00

Instead of checking whether the number of CQEs is negative or zero, fix the .resize_user_cq() declaration to use unsigned int. This better reflects the expected value range. The sanity check is then handled correctly in ib_uvbers. Link: https://patch.msgid.link/20260319-resize_cq-cqe-v1-1-b78c6efc1def@nvidia.com Reviewed-by: Zhu Yanjun Signed-off-by: Leon Romanovsky