C++ (Cpp) __add_page Examples

Example #1

File: dbrec.c Project: FreeBSDFoundation/freebsd

uint32_t *mlx5_alloc_dbrec(struct mlx5_context *context)
{
	struct mlx5_db_page *page;
	uint32_t *db = NULL;
	int i, j;

	pthread_mutex_lock(&context->db_list_mutex);

	for (page = context->db_list; page; page = page->next)
		if (page->use_cnt < page->num_db)
			goto found;

	page = __add_page(context);
	if (!page)
		goto out;

found:
	++page->use_cnt;

	for (i = 0; !page->free[i]; ++i)
		/* nothing */;

	j = ffsl(page->free[i]);
	--j;
	page->free[i] &= ~(1UL << j);
	db = page->buf.buf + (i * 8 * sizeof(long) + j) * context->cache_line_size;

out:
	pthread_mutex_unlock(&context->db_list_mutex);

	return db;
}

Example #2

int mthca_alloc_av(struct mthca_pd *pd, struct ibv_ah_attr *attr,
		   struct mthca_ah *ah)
{
	if (mthca_is_memfree(pd->ibv_pd.context)) {
		ah->av = malloc(sizeof *ah->av);
		if (!ah->av)
			return -1;
	} else {
		struct mthca_ah_page *page;
		int ps;
		int pp;
		int i, j;

		ps = to_mdev(pd->ibv_pd.context->device)->page_size;
		pp = ps / (sizeof *ah->av * 8 * sizeof (int));

		pthread_mutex_lock(&pd->ah_mutex);
		for (page = pd->ah_list; page; page = page->next)
			if (page->use_cnt < ps / sizeof *ah->av)
				for (i = 0; i < pp; ++i)
					if (page->free[i])
						goto found;

		page = __add_page(pd, ps, pp);
		if (!page) {
			pthread_mutex_unlock(&pd->ah_mutex);
			return -1;
		}

	found:
		++page->use_cnt;

		for (i = 0, j = -1; i < pp; ++i)
			if (page->free[i]) {
				j = ffs(page->free[i]);
				page->free[i] &= ~(1 << (j - 1));
				ah->av = page->buf.buf +
					(i * 8 * sizeof (int) + (j - 1)) * sizeof *ah->av;
				break;
			}

		ah->key  = page->mr->lkey;
		ah->page = page;

		pthread_mutex_unlock(&pd->ah_mutex);
	}

	memset(ah->av, 0, sizeof *ah->av);

	ah->av->port_pd = htonl(pd->pdn | (attr->port_num << 24));
	ah->av->g_slid  = attr->src_path_bits;
	ah->av->dlid    = htons(attr->dlid);
	ah->av->msg_sr  = (3 << 4) | /* 2K message */
		attr->static_rate;
	ah->av->sl_tclass_flowlabel = htonl(attr->sl << 28);
	if (attr->is_global) {
		ah->av->g_slid |= 0x80;
		/* XXX get gid_table length */
		ah->av->gid_index = (attr->port_num - 1) * 32 +
			attr->grh.sgid_index;
		ah->av->hop_limit = attr->grh.hop_limit;
		ah->av->sl_tclass_flowlabel |=
			htonl((attr->grh.traffic_class << 20) |
				    attr->grh.flow_label);
		memcpy(ah->av->dgid, attr->grh.dgid.raw, 16);
	} else {
		/* Arbel workaround -- low byte of GID must be 2 */
		ah->av->dgid[3] = htonl(2);
	}

	return 0;
}