io_uring: introduce attributes for read/write and PI support

Add the ability to pass additional attributes along with read/write. Application can prepare attibute specific information and pass its address using the SQE field: __u64 attr_ptr; Along with setting a mask indicating attributes being passed: __u64 attr_type_mask; Overall 64 attributes are allowed and currently one attribute 'IORING_RW_ATTR_FLAG_PI' is supported. With PI attribute, userspace can pass following information: - flags: integrity check flags IO_INTEGRITY_CHK_{GUARD/APPTAG/REFTAG} - len: length of PI/metadata buffer - addr: address of metadata buffer - seed: seed value for reftag remapping - app_tag: application defined 16b value Process this information to prepare uio_meta_descriptor and pass it down using kiocb->private. PI attribute is supported only for direct IO.

Anuj Gupta committed 1 year ago

Commit 59a7d121 parent 4de2ce04 files · +112 −3Browse files

Showing the changes to include/uapi (1 of 4 files). Show all

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include/uapi/linux/io_uring.h+16−0

@@ -98,6 +98,10 @@ struct io_uring_sqe { · 97 unmodified lines
98	__u64 addr3;	98	__u64 addr3;
99	__u64 __pad2[1];	99	__u64 __pad2[1];
100	};	100	};
		101	struct {
		102	__u64 attr_ptr; /* pointer to attribute information */
		103	__u64 attr_type_mask; /* bit mask of attributes */
		104	};
101	__u64 optval;	105	__u64 optval;
102	/*	106	/*
103	* If the ring is initialized with IORING_SETUP_SQE128, then	107	* If the ring is initialized with IORING_SETUP_SQE128, then
@@ -107,6 +111,18 @@ struct io_uring_sqe { · 3 unmodified lines
107	};	111	};
108	};	112	};
109		113
		114	/* sqe->attr_type_mask flags */
		115	#define IORING_RW_ATTR_FLAG_PI (1U << 0)
		116	/* PI attribute information */
		117	struct io_uring_attr_pi {
		118	__u16 flags;
		119	__u16 app_tag;
		120	__u32 len;
		121	__u64 addr;
		122	__u64 seed;
		123	__u64 rsvd;
		124	};
		125
110	/*	126	/*
111	* If sqe->file_index is set to this for opcodes that instantiate a new	127	* If sqe->file_index is set to this for opcodes that instantiate a new
112	* direct descriptor (like openat/openat2/accept), then io_uring will allocate	128	* direct descriptor (like openat/openat2/accept), then io_uring will allocate