Function ccp_assign_lsbs

dpdk/drivers/crypto/ccp/ccp_dev.c:430–481

For each queue, from the most- to least-constrained: * find an LSB that can be assigned to the queue. If there are N queues that * can only use M LSBs, where N > M, fail; otherwise, every queue will get a * dedicated LSB. Remaining LSB regions become a shared resource. * If we have fewer LSBs than queues, all LSB regions become shared * resources. */

 * resources.
 */
static int
ccp_assign_lsbs(struct ccp_device *ccp)
{
	unsigned long lsb_pub = 0, qlsb = 0;
	int n_lsbs = 0;
	int bitno;
	int i, lsb_cnt;
	int rc = 0;

	rte_spinlock_init(&ccp->lsb_lock);

	/* Create an aggregate bitmap to get a total count of available LSBs */
	for (i = 0; i < ccp->cmd_q_count; i++)
		lsb_pub |= ccp->cmd_q[i].lsbmask;

	for (i = 0; i < MAX_LSB_CNT; i++)
		if (ccp_get_bit(&lsb_pub, i))
			n_lsbs++;

	if (n_lsbs >= ccp->cmd_q_count) {
		/* We have enough LSBS to give every queue a private LSB.
		 * Brute force search to start with the queues that are more
		 * constrained in LSB choice. When an LSB is privately
		 * assigned, it is removed from the public mask.
		 * This is an ugly N squared algorithm with some optimization.
		 */
		for (lsb_cnt = 1; n_lsbs && (lsb_cnt <= MAX_LSB_CNT);
		     lsb_cnt++) {
			rc = ccp_find_and_assign_lsb_to_q(ccp, lsb_cnt, n_lsbs,
							  &lsb_pub);
			if (rc < 0)
				return -EINVAL;
			n_lsbs = rc;
		}
	}

	rc = 0;
	/* What's left of the LSBs, according to the public mask, now become
	 * shared. Any zero bits in the lsb_pub mask represent an LSB region
	 * that can't be used as a shared resource, so mark the LSB slots for
	 * them as "in use".
	 */
	qlsb = lsb_pub;
	bitno = ccp_find_first_zero_bit(&qlsb, MAX_LSB_CNT);
	while (bitno < MAX_LSB_CNT) {
		ccp_bitmap_set(ccp->lsbmap, bitno * LSB_SIZE, LSB_SIZE);
		ccp_set_bit(&qlsb, bitno);
		bitno = ccp_find_first_zero_bit(&qlsb, MAX_LSB_CNT);
	}

	return rc;
}

static int
ccp_add_device(struct ccp_device *dev)