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| author | Chiara Meiohas <cmeiohas@nvidia.com> | 2025-03-06 13:51:26 +0200 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2025-03-09 13:13:02 -0400 |
| commit | 61e51682816d395307f78ae06d640089054c28ab (patch) | |
| tree | 2dbd9cb33c75cb5d2fdcad5d568c7178b1d5354a /include/rdma | |
| parent | 1d5c69514e742846ad3b8727b51b1fd46ea251fd (diff) | |
| download | linux-61e51682816d395307f78ae06d640089054c28ab.tar.gz linux-61e51682816d395307f78ae06d640089054c28ab.tar.bz2 linux-61e51682816d395307f78ae06d640089054c28ab.zip | |
RDMA/uverbs: Introduce UCAP (User CAPabilities) API
Implement a new User CAPabilities (UCAP) API to provide fine-grained
control over specific firmware features.
This approach offers more granular capabilities than the existing Linux
capabilities, which may be too generic for certain FW features.
This mechanism represents each capability as a character device with
root read-write access. Root processes can grant users special
privileges by allowing access to these character devices (e.g., using
chown).
UCAP character devices are located in /dev/infiniband and the class path
is /sys/class/infiniband_ucaps.
Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Link: https://patch.msgid.link/5a1379187cd21178e8554afc81a3c941f21af22f.1741261611.git.leon@kernel.org
Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_ucaps.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/rdma/ib_ucaps.h b/include/rdma/ib_ucaps.h new file mode 100644 index 000000000000..d9f96be3a553 --- /dev/null +++ b/include/rdma/ib_ucaps.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright (c) 2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved + */ + +#ifndef _IB_UCAPS_H_ +#define _IB_UCAPS_H_ + +#define UCAP_ENABLED(ucaps, type) (!!((ucaps) & (1U << (type)))) + +enum rdma_user_cap { + RDMA_UCAP_MLX5_CTRL_LOCAL, + RDMA_UCAP_MLX5_CTRL_OTHER_VHCA, + RDMA_UCAP_MAX +}; + +void ib_cleanup_ucaps(void); +int ib_get_ucaps(int *fds, int fd_count, uint64_t *idx_mask); +#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS) +int ib_create_ucap(enum rdma_user_cap type); +void ib_remove_ucap(enum rdma_user_cap type); +#else +static inline int ib_create_ucap(enum rdma_user_cap type) +{ + return -EOPNOTSUPP; +} +static inline void ib_remove_ucap(enum rdma_user_cap type) {} +#endif /* CONFIG_INFINIBAND_USER_ACCESS */ + +#endif /* _IB_UCAPS_H_ */ |