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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | #ifndef LIB_URING_H #define LIB_URING_H #ifdef __cplusplus extern "C" { #endif #include <sys/uio.h> #include <signal.h> #include <string.h> #include "../../include/uapi/linux/io_uring.h" #include <inttypes.h> #include <linux/swab.h> #include "barrier.h" /* * Library interface to io_uring */ struct io_uring_sq { unsigned *khead; unsigned *ktail; unsigned *kring_mask; unsigned *kring_entries; unsigned *kflags; unsigned *kdropped; unsigned *array; struct io_uring_sqe *sqes; unsigned sqe_head; unsigned sqe_tail; size_t ring_sz; }; struct io_uring_cq { unsigned *khead; unsigned *ktail; unsigned *kring_mask; unsigned *kring_entries; unsigned *koverflow; struct io_uring_cqe *cqes; size_t ring_sz; }; struct io_uring { struct io_uring_sq sq; struct io_uring_cq cq; int ring_fd; }; /* * System calls */ extern int io_uring_setup(unsigned entries, struct io_uring_params *p); extern int io_uring_enter(int fd, unsigned to_submit, unsigned min_complete, unsigned flags, sigset_t *sig); extern int io_uring_register(int fd, unsigned int opcode, void *arg, unsigned int nr_args); /* * Library interface */ extern int io_uring_queue_init(unsigned entries, struct io_uring *ring, unsigned flags); extern int io_uring_queue_mmap(int fd, struct io_uring_params *p, struct io_uring *ring); extern void io_uring_queue_exit(struct io_uring *ring); extern int io_uring_peek_cqe(struct io_uring *ring, struct io_uring_cqe **cqe_ptr); extern int io_uring_wait_cqe(struct io_uring *ring, struct io_uring_cqe **cqe_ptr); extern int io_uring_submit(struct io_uring *ring); extern struct io_uring_sqe *io_uring_get_sqe(struct io_uring *ring); /* * Must be called after io_uring_{peek,wait}_cqe() after the cqe has * been processed by the application. */ static inline void io_uring_cqe_seen(struct io_uring *ring, struct io_uring_cqe *cqe) { if (cqe) { struct io_uring_cq *cq = &ring->cq; (*cq->khead)++; /* * Ensure that the kernel sees our new head, the kernel has * the matching read barrier. */ write_barrier(); } } /* * Command prep helpers */ static inline void io_uring_sqe_set_data(struct io_uring_sqe *sqe, void *data) { sqe->user_data = (unsigned long) data; } static inline void *io_uring_cqe_get_data(struct io_uring_cqe *cqe) { return (void *) (uintptr_t) cqe->user_data; } static inline void io_uring_prep_rw(int op, struct io_uring_sqe *sqe, int fd, const void *addr, unsigned len, off_t offset) { memset(sqe, 0, sizeof(*sqe)); sqe->opcode = op; sqe->fd = fd; sqe->off = offset; sqe->addr = (unsigned long) addr; sqe->len = len; } static inline void io_uring_prep_readv(struct io_uring_sqe *sqe, int fd, const struct iovec *iovecs, unsigned nr_vecs, off_t offset) { io_uring_prep_rw(IORING_OP_READV, sqe, fd, iovecs, nr_vecs, offset); } static inline void io_uring_prep_read_fixed(struct io_uring_sqe *sqe, int fd, void *buf, unsigned nbytes, off_t offset) { io_uring_prep_rw(IORING_OP_READ_FIXED, sqe, fd, buf, nbytes, offset); } static inline void io_uring_prep_writev(struct io_uring_sqe *sqe, int fd, const struct iovec *iovecs, unsigned nr_vecs, off_t offset) { io_uring_prep_rw(IORING_OP_WRITEV, sqe, fd, iovecs, nr_vecs, offset); } static inline void io_uring_prep_write_fixed(struct io_uring_sqe *sqe, int fd, const void *buf, unsigned nbytes, off_t offset) { io_uring_prep_rw(IORING_OP_WRITE_FIXED, sqe, fd, buf, nbytes, offset); } static inline void io_uring_prep_poll_add(struct io_uring_sqe *sqe, int fd, unsigned poll_mask) { memset(sqe, 0, sizeof(*sqe)); sqe->opcode = IORING_OP_POLL_ADD; sqe->fd = fd; #if __BYTE_ORDER == __BIG_ENDIAN poll_mask = __swahw32(poll_mask); #endif sqe->poll_events = poll_mask; } static inline void io_uring_prep_poll_remove(struct io_uring_sqe *sqe, void *user_data) { memset(sqe, 0, sizeof(*sqe)); sqe->opcode = IORING_OP_POLL_REMOVE; sqe->addr = (unsigned long) user_data; } static inline void io_uring_prep_fsync(struct io_uring_sqe *sqe, int fd, unsigned fsync_flags) { memset(sqe, 0, sizeof(*sqe)); sqe->opcode = IORING_OP_FSYNC; sqe->fd = fd; sqe->fsync_flags = fsync_flags; } static inline void io_uring_prep_nop(struct io_uring_sqe *sqe) { memset(sqe, 0, sizeof(*sqe)); sqe->opcode = IORING_OP_NOP; } #ifdef __cplusplus } #endif #endif |