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#include <haproxy/quic_fctl.h>
#include <haproxy/api.h>
void qfctl_init(struct quic_fctl *fctl, uint64_t limit)
{
fctl->limit = limit;
fctl->off_real = 0;
fctl->off_soft = 0;
}
/* Returns true if real limit is blocked for <fctl> flow control instance.
* This happens if it is equal than current max value.
*/
int qfctl_rblocked(const struct quic_fctl *fctl)
{
/* Real limit must never be exceeded. */
BUG_ON(fctl->off_real > fctl->limit);
return fctl->off_real == fctl->limit;
}
/* Returns true if soft limit is blocked for <fctl> flow control instance.
* This happens if it is equal or greater than current max value.
*/
int qfctl_sblocked(const struct quic_fctl *fctl)
{
return fctl->off_soft >= fctl->limit;
}
/* Set a new <val> maximum value for <fctl> flow control instance. If current
* offset is already equal or more, the new value is ignored. Additionally,
* <unblocked_soft> and <unblocked_real> can be used as output parameters to
* detect if the current update result in one or both of these offsets to be
* unblocked.
*
* Returns true if max is incremented else false.
*/
int qfctl_set_max(struct quic_fctl *fctl, uint64_t val,
int *out_unblock_soft, int *out_unblock_real)
{
int unblock_soft = 0, unblock_real = 0;
int ret = 0;
if (fctl->limit < val) {
if (fctl->off_soft >= fctl->limit && fctl->off_soft < val)
unblock_soft = 1;
if (fctl->off_real == fctl->limit && fctl->off_real < val)
unblock_real = 1;
fctl->limit = val;
ret = 1;
}
if (out_unblock_soft)
*out_unblock_soft = unblock_soft;
if (out_unblock_real)
*out_unblock_real = unblock_real;
return ret;
}
/* Increment real offset of <fctl> flow control instance by <diff>. This cannot
* exceed <fctl> limit.
*
* Returns true if limit is reached after increment.
*/
int qfctl_rinc(struct quic_fctl *fctl, uint64_t diff)
{
/* Real limit must never be exceeded. */
BUG_ON(fctl->off_real + diff > fctl->limit);
fctl->off_real += diff;
return fctl->off_real == fctl->limit;
}
/* Increment soft offset of <fctl> flow control instance by <diff>. This cannot
* be done if <fctl> limit was already reached.
*
* Returns true if limit is reached after increment.
*/
int qfctl_sinc(struct quic_fctl *fctl, uint64_t diff)
{
/* Soft limit must not be incremented if already in excess. */
BUG_ON(qfctl_sblocked(fctl));
fctl->off_soft += diff;
return fctl->off_soft >= fctl->limit;
}
/* Return the remaining offset before reaching <fctl> limit. */
uint64_t qfctl_rcap(const struct quic_fctl *fctl)
{
/* Real limit must never be exceeded. */
BUG_ON(fctl->off_real > fctl->limit);
return fctl->limit - fctl->off_real;
}
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