Function bbr_alloc_limit

freebsd/netinet/tcp_stacks/bbr.c:3329–3354

wrapper to allocate a sendmap entry, subject to a specific limit */

/* wrapper to allocate a sendmap entry, subject to a specific limit */
static struct bbr_sendmap *
bbr_alloc_limit(struct tcp_bbr *bbr, uint8_t limit_type)
{
	struct bbr_sendmap *rsm;

	if (limit_type) {
		/* currently there is only one limit type */
		if (V_tcp_map_split_limit > 0 &&
		    bbr->r_ctl.rc_num_split_allocs >= V_tcp_map_split_limit) {
			BBR_STAT_INC(bbr_split_limited);
			if (!bbr->alloc_limit_reported) {
				bbr->alloc_limit_reported = 1;
				BBR_STAT_INC(bbr_alloc_limited_conns);
			}
			return (NULL);
		}
	}

	/* allocate and mark in the limit type, if set */
	rsm = bbr_alloc(bbr);
	if (rsm != NULL && limit_type) {
		rsm->r_limit_type = limit_type;
		bbr->r_ctl.rc_num_split_allocs++;
	}
	return (rsm);
}

static void
bbr_free(struct tcp_bbr *bbr, struct bbr_sendmap *rsm)