xref: /freebsd/sys/dev/ixl/ixl_pf_qmgr.c (revision 71625ec9ad2a9bc8c09784fbd23b759830e0ee5f)

/******************************************************************************

  Copyright (c) 2013-2018, Intel Corporation
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
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      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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******************************************************************************/


#include "ixl_pf_qmgr.h"

static int	ixl_pf_qmgr_find_free_contiguous_block(struct ixl_pf_qmgr *qmgr, int num);

int
ixl_pf_qmgr_init(struct ixl_pf_qmgr *qmgr, u16 num_queues)
{
	if (num_queues < 1)
		return (EINVAL);

	qmgr->num_queues = num_queues;
	qmgr->qinfo = malloc(num_queues * sizeof(struct ixl_pf_qmgr_qinfo),
	    M_IXL, M_ZERO | M_NOWAIT);
	if (qmgr->qinfo == NULL)
		return ENOMEM;

	return (0);
}

int
ixl_pf_qmgr_alloc_contiguous(struct ixl_pf_qmgr *qmgr, u16 num, struct ixl_pf_qtag *qtag)
{
	int i;
	int avail;
	int block_start;
	u16 alloc_size;

	if (qtag == NULL || num < 1)
		return (EINVAL);

	/* We have to allocate in power-of-two chunks, so get next power of two */
	alloc_size = (u16)next_power_of_two(num);

	/* Don't try if there aren't enough queues */
	avail = ixl_pf_qmgr_get_num_free(qmgr);
	if (avail < alloc_size)
		return (ENOSPC);

	block_start = ixl_pf_qmgr_find_free_contiguous_block(qmgr, alloc_size);
	if (block_start < 0)
		return (ENOSPC);

	/* Mark queues as allocated */
	for (i = block_start; i < block_start + alloc_size; i++)
		qmgr->qinfo[i].allocated = true;

	bzero(qtag, sizeof(*qtag));
	qtag->qmgr = qmgr;
	qtag->type = IXL_PF_QALLOC_CONTIGUOUS;
	qtag->qidx[0] = block_start;
	qtag->num_allocated = alloc_size;
	qtag->num_active = num;

	return (0);
}

/*
 * NB: indices is u16 because this is the queue index width used in the Add VSI AQ command
 */
int
ixl_pf_qmgr_alloc_scattered(struct ixl_pf_qmgr *qmgr, u16 num, struct ixl_pf_qtag *qtag)
{
	int i;
	int avail, count = 0;
	u16 alloc_size;

	if (qtag == NULL || num < 1 || num > 16)
		return (EINVAL);

	/* We have to allocate in power-of-two chunks, so get next power of two */
	alloc_size = (u16)next_power_of_two(num);

	avail = ixl_pf_qmgr_get_num_free(qmgr);
	if (avail < alloc_size)
		return (ENOSPC);

	bzero(qtag, sizeof(*qtag));
	qtag->qmgr = qmgr;
	qtag->type = IXL_PF_QALLOC_SCATTERED;
	qtag->num_active = num;
	qtag->num_allocated = alloc_size;

	for (i = 0; i < qmgr->num_queues; i++) {
		if (!qmgr->qinfo[i].allocated) {
			qtag->qidx[count] = i;
			count++;
			qmgr->qinfo[i].allocated = true;
			if (count == alloc_size)
				return (0);
		}
	}

	// Shouldn't get here
	return (EDOOFUS);
}

int
ixl_pf_qmgr_release(struct ixl_pf_qmgr *qmgr, struct ixl_pf_qtag *qtag)
{
	u16 i, qidx;

	if (qtag == NULL)
		return (EINVAL);

	if (qtag->type == IXL_PF_QALLOC_SCATTERED) {
		for (i = 0; i < qtag->num_allocated; i++) {
			qidx = qtag->qidx[i];
			bzero(&qmgr->qinfo[qidx], sizeof(qmgr->qinfo[qidx]));
		}
	} else {
		u16 first_index = qtag->qidx[0];
		for (i = first_index; i < first_index + qtag->num_allocated; i++)
			bzero(&qmgr->qinfo[i], sizeof(qmgr->qinfo[qidx]));
	}

	qtag->qmgr = NULL;
	return (0);
}

int
ixl_pf_qmgr_get_num_queues(struct ixl_pf_qmgr *qmgr)
{
	return (qmgr->num_queues);
}

/*
 * ERJ: This assumes the info array isn't longer than INT_MAX.
 * This assumption might cause a y3k bug or something, I'm sure.
 */
int
ixl_pf_qmgr_get_num_free(struct ixl_pf_qmgr *qmgr)
{
	int count = 0;

	for (int i = 0; i < qmgr->num_queues; i++) {
		if (!qmgr->qinfo[i].allocated)
			count++;
	}

	return (count);
}

int
ixl_pf_qmgr_get_first_free(struct ixl_pf_qmgr *qmgr, u16 start)
{
	int i;

	if (start > qmgr->num_queues - 1)
		return (-EINVAL);

	for (i = start; i < qmgr->num_queues; i++) {
		if (qmgr->qinfo[i].allocated)
			continue;
		else
			return (i);
	}

	// No free queues
	return (-ENOSPC);
}

void
ixl_pf_qmgr_destroy(struct ixl_pf_qmgr *qmgr)
{
	free(qmgr->qinfo, M_IXL);
	qmgr->qinfo = NULL;
}

void
ixl_pf_qmgr_mark_queue_enabled(struct ixl_pf_qtag *qtag, u16 vsi_qidx, bool tx)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, vsi_qidx);
	if (tx)
		qmgr->qinfo[pf_qidx].tx_enabled = true;
	else
		qmgr->qinfo[pf_qidx].rx_enabled = true;
}

void
ixl_pf_qmgr_mark_queue_disabled(struct ixl_pf_qtag *qtag, u16 vsi_qidx, bool tx)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, vsi_qidx);
	if (tx)
		qmgr->qinfo[pf_qidx].tx_enabled = false;
	else
		qmgr->qinfo[pf_qidx].rx_enabled = false;
}

void
ixl_pf_qmgr_mark_queue_configured(struct ixl_pf_qtag *qtag, u16 vsi_qidx, bool tx)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, vsi_qidx);
	if (tx)
		qmgr->qinfo[pf_qidx].tx_configured = true;
	else
		qmgr->qinfo[pf_qidx].rx_configured = true;
}

bool
ixl_pf_qmgr_is_queue_enabled(struct ixl_pf_qtag *qtag, u16 vsi_qidx, bool tx)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, vsi_qidx);
	if (tx)
		return (qmgr->qinfo[pf_qidx].tx_enabled);
	else
		return (qmgr->qinfo[pf_qidx].rx_enabled);
}

bool
ixl_pf_qmgr_is_queue_configured(struct ixl_pf_qtag *qtag, u16 vsi_qidx, bool tx)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, vsi_qidx);
	if (tx)
		return (qmgr->qinfo[pf_qidx].tx_configured);
	else
		return (qmgr->qinfo[pf_qidx].rx_configured);
}

void
ixl_pf_qmgr_clear_queue_flags(struct ixl_pf_qtag *qtag)
{
	MPASS(qtag != NULL);

	struct ixl_pf_qmgr *qmgr = qtag->qmgr;
	for (u16 i = 0; i < qtag->num_allocated; i++) {
		u16 pf_qidx = ixl_pf_qidx_from_vsi_qidx(qtag, i);

		qmgr->qinfo[pf_qidx].tx_configured = 0;
		qmgr->qinfo[pf_qidx].rx_configured = 0;
		qmgr->qinfo[pf_qidx].rx_enabled = 0;
		qmgr->qinfo[pf_qidx].tx_enabled = 0;
	}
}

u16
ixl_pf_qidx_from_vsi_qidx(struct ixl_pf_qtag *qtag, u16 index)
{
	MPASS(index < qtag->num_allocated);

	if (qtag->type == IXL_PF_QALLOC_CONTIGUOUS)
		return qtag->first_qidx + index;
	else
		return qtag->qidx[index];
}

/* Static Functions */

static int
ixl_pf_qmgr_find_free_contiguous_block(struct ixl_pf_qmgr *qmgr, int num)
{
	int i;
	int count = 0;
	bool block_started = false;
	int possible_start;

	for (i = 0; i < qmgr->num_queues; i++) {
		if (!qmgr->qinfo[i].allocated) {
			if (!block_started) {
				block_started = true;
				possible_start = i;
			}
			count++;
			if (count == num)
				return (possible_start);
		} else { /* this queue is already allocated */
			block_started = false;
			count = 0;
		}
	}

	/* Can't find a contiguous block of the requested size */
	return (-1);
}