Function mana_find_pmd_mr

dpdk/drivers/net/mana/mr.c:126–190

* Find a MR from cache. If not found, register a new MR. */

 * Find a MR from cache. If not found, register a new MR.
 */
struct mana_mr_cache *
mana_find_pmd_mr(struct mana_mr_btree *local_mr_btree, struct mana_priv *priv,
		 struct rte_mbuf *mbuf)
{
	struct rte_mempool *pool = mbuf->pool;
	int ret, second_try = 0;
	struct mana_mr_cache *mr;
	uint16_t idx;

	DP_LOG(DEBUG, "finding mr for mbuf addr %p len %d",
	       mbuf->buf_addr, mbuf->buf_len);

try_again:
	/* First try to find the MR in local queue tree */
	ret = mana_mr_btree_lookup(local_mr_btree, &idx,
				   (uintptr_t)mbuf->buf_addr, mbuf->buf_len,
				   &mr);
	if (ret)
		return NULL;

	if (mr) {
		DP_LOG(DEBUG, "Local mr lkey %u addr 0x%" PRIxPTR " len %zu",
		       mr->lkey, mr->addr, mr->len);
		return mr;
	}

	/* If not found, try to find the MR in global tree */
	rte_spinlock_lock(&priv->mr_btree_lock);
	ret = mana_mr_btree_lookup(&priv->mr_btree, &idx,
				   (uintptr_t)mbuf->buf_addr,
				   mbuf->buf_len, &mr);
	rte_spinlock_unlock(&priv->mr_btree_lock);

	if (ret)
		return NULL;

	/* If found in the global tree, add it to the local tree */
	if (mr) {
		ret = mana_mr_btree_insert(local_mr_btree, mr);
		if (ret) {
			DP_LOG(ERR, "Failed to add MR to local tree.");
			return NULL;
		}

		DP_LOG(DEBUG,
		       "Added local MR key %u addr 0x%" PRIxPTR " len %zu",
		       mr->lkey, mr->addr, mr->len);
		return mr;
	}

	if (second_try) {
		DP_LOG(ERR, "Internal error second try failed");
		return NULL;
	}

	ret = mana_new_pmd_mr(local_mr_btree, priv, pool);
	if (ret) {
		DP_LOG(ERR, "Failed to allocate MR ret %d addr %p len %d",