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/* SPDX-License-Identifier: MIT */
#ifndef LIBURING_PROXY_H
#define LIBURING_PROXY_H
#include <sys/time.h>
/*
* Generic opcode agnostic encoding to sqe/cqe->user_data
*/
struct userdata {
union {
struct {
uint16_t op_tid; /* 4 bits op, 12 bits tid */
uint16_t bid;
uint16_t fd;
};
uint64_t val;
};
};
#define OP_SHIFT (12)
#define TID_MASK ((1U << 12) - 1)
/*
* Packs the information that we will need at completion time into the
* sqe->user_data field, which is passed back in the completion in
* cqe->user_data. Some apps would need more space than this, and in fact
* I'd love to pack the requested IO size in here, and it's not uncommon to
* see apps use this field as just a cookie to either index a data structure
* at completion time, or even just put the pointer to the associated
* structure into this field.
*/
static inline void __encode_userdata(struct io_uring_sqe *sqe, int tid, int op,
int bid, int fd)
{
struct userdata ud = {
.op_tid = (op << OP_SHIFT) | tid,
.bid = bid,
.fd = fd
};
io_uring_sqe_set_data64(sqe, ud.val);
}
static inline uint64_t __raw_encode(int tid, int op, int bid, int fd)
{
struct userdata ud = {
.op_tid = (op << OP_SHIFT) | tid,
.bid = bid,
.fd = fd
};
return ud.val;
}
static inline int cqe_to_op(struct io_uring_cqe *cqe)
{
struct userdata ud = { .val = cqe->user_data };
return ud.op_tid >> OP_SHIFT;
}
static inline int cqe_to_bid(struct io_uring_cqe *cqe)
{
struct userdata ud = { .val = cqe->user_data };
return ud.bid;
}
static inline int cqe_to_fd(struct io_uring_cqe *cqe)
{
struct userdata ud = { .val = cqe->user_data };
return ud.fd;
}
static unsigned long long mtime_since(const struct timeval *s,
const struct timeval *e)
{
long long sec, usec;
sec = e->tv_sec - s->tv_sec;
usec = (e->tv_usec - s->tv_usec);
if (sec > 0 && usec < 0) {
sec--;
usec += 1000000;
}
sec *= 1000;
usec /= 1000;
return sec + usec;
}
static unsigned long long mtime_since_now(struct timeval *tv)
{
struct timeval end;
gettimeofday(&end, NULL);
return mtime_since(tv, &end);
}
#endif
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