drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c - kernel/common - Git at Google

 /* Broadcom NetXtreme-C/E network driver.
  *
  * Copyright (c) 2016-2018 Broadcom Limited
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation.
  */

 #include <linux/module.h>

 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/bitops.h>
 #include <linux/irq.h>
 #include <asm/byteorder.h>
 #include <linux/bitmap.h>

 #include "bnxt_hsi.h"
 #include "bnxt.h"
 #include "bnxt_ulp.h"

 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
 			     struct bnxt_ulp_ops *ulp_ops, void *handle)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_ulp *ulp;

 	ASSERT_RTNL();
 	if (ulp_id >= BNXT_MAX_ULP)
 		return -EINVAL;

 	ulp = &edev->ulp_tbl[ulp_id];
 	if (rcu_access_pointer(ulp->ulp_ops)) {
 		netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
 		return -EBUSY;
 	}
 	if (ulp_id == BNXT_ROCE_ULP) {
 		unsigned int max_stat_ctxs;

 		max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
 		if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
 		    bp->cp_nr_rings == max_stat_ctxs)
 			return -ENOMEM;
 	}

 	atomic_set(&ulp->ref_count, 0);
 	ulp->handle = handle;
 	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);

 	if (ulp_id == BNXT_ROCE_ULP) {
 		if (test_bit(BNXT_STATE_OPEN, &bp->state))
 			bnxt_hwrm_vnic_cfg(bp, 0);
 	}

 	return 0;
 }

 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_ulp *ulp;
 	int i = 0;

 	ASSERT_RTNL();
 	if (ulp_id >= BNXT_MAX_ULP)
 		return -EINVAL;

 	ulp = &edev->ulp_tbl[ulp_id];
 	if (!rcu_access_pointer(ulp->ulp_ops)) {
 		netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
 		return -EINVAL;
 	}
 	if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested)
 		edev->en_ops->bnxt_free_msix(edev, ulp_id);

 	if (ulp->max_async_event_id)
 		bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0);

 	RCU_INIT_POINTER(ulp->ulp_ops, NULL);
 	synchronize_rcu();
 	ulp->max_async_event_id = 0;
 	ulp->async_events_bmap = NULL;
 	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
 		msleep(100);
 		i++;
 	}
 	return 0;
 }

 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	int num_msix, idx, i;

 	num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 	idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 	for (i = 0; i < num_msix; i++) {
 		ent[i].vector = bp->irq_tbl[idx + i].vector;
 		ent[i].ring_idx = idx + i;
 		ent[i].db_offset = (idx + i) * 0x80;
 	}
 }

 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
 			      struct bnxt_msix_entry *ent, int num_msix)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
 	int max_idx, max_cp_rings;
 	int avail_msix, idx;
 	int rc = 0;

 	ASSERT_RTNL();
 	if (ulp_id != BNXT_ROCE_ULP)
 		return -EINVAL;

 	if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 		return -ENODEV;

 	if (edev->ulp_tbl[ulp_id].msix_requested)
 		return -EAGAIN;

 	max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 	avail_msix = bnxt_get_avail_msix(bp, num_msix);
 	if (!avail_msix)
 		return -ENOMEM;
 	if (avail_msix > num_msix)
 		avail_msix = num_msix;

 	if (BNXT_NEW_RM(bp)) {
 		idx = bp->cp_nr_rings;
 	} else {
 		max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 		idx = max_idx - avail_msix;
 	}
 	edev->ulp_tbl[ulp_id].msix_base = idx;
 	edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 	if (bp->total_irqs < (idx + avail_msix)) {
 		if (netif_running(dev)) {
 			bnxt_close_nic(bp, true, false);
 			rc = bnxt_open_nic(bp, true, false);
 		} else {
 			rc = bnxt_reserve_rings(bp, true);
 		}
 	}
 	if (rc) {
 		edev->ulp_tbl[ulp_id].msix_requested = 0;
 		return -EAGAIN;
 	}

 	if (BNXT_NEW_RM(bp)) {
 		struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
 		int resv_msix;

 		resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
 		avail_msix = min_t(int, resv_msix, avail_msix);
 		edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 	}
 	bnxt_fill_msix_vecs(bp, ent);
 	edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 	return avail_msix;
 }

 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);

 	ASSERT_RTNL();
 	if (ulp_id != BNXT_ROCE_ULP)
 		return -EINVAL;

 	if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 		return 0;

 	edev->ulp_tbl[ulp_id].msix_requested = 0;
 	edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 	if (netif_running(dev)) {
 		bnxt_close_nic(bp, true, false);
 		bnxt_open_nic(bp, true, false);
 	}
 	return 0;
 }

 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 {
 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 		struct bnxt_en_dev *edev = bp->edev;

 		return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 	}
 	return 0;
 }

 int bnxt_get_ulp_msix_base(struct bnxt *bp)
 {
 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 		struct bnxt_en_dev *edev = bp->edev;

 		if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
 			return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 	}
 	return 0;
 }

 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
 {
 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
 		return BNXT_MIN_ROCE_STAT_CTXS;

 	return 0;
 }

 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 			 struct bnxt_fw_msg *fw_msg)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
 	struct input *req;
 	int rc;

 	mutex_lock(&bp->hwrm_cmd_lock);
 	req = fw_msg->msg;
 	req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 	rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 				fw_msg->timeout);
 	if (!rc) {
 		struct output *resp = bp->hwrm_cmd_resp_addr;
 		u32 len = le16_to_cpu(resp->resp_len);

 		if (fw_msg->resp_max_len < len)
 			len = fw_msg->resp_max_len;

 		memcpy(fw_msg->resp, resp, len);
 	}
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	return rc;
 }

 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 {
 	atomic_inc(&ulp->ref_count);
 }

 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 {
 	atomic_dec(&ulp->ref_count);
 }

 void bnxt_ulp_stop(struct bnxt *bp)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;
 	int i;

 	if (!edev)
 		return;

 	for (i = 0; i < BNXT_MAX_ULP; i++) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

 		ops = rtnl_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_stop)
 			continue;
 		ops->ulp_stop(ulp->handle);
 	}
 }

 void bnxt_ulp_start(struct bnxt *bp)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;
 	int i;

 	if (!edev)
 		return;

 	for (i = 0; i < BNXT_MAX_ULP; i++) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

 		ops = rtnl_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_start)
 			continue;
 		ops->ulp_start(ulp->handle);
 	}
 }

 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;
 	int i;

 	if (!edev)
 		return;

 	for (i = 0; i < BNXT_MAX_ULP; i++) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

 		rcu_read_lock();
 		ops = rcu_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_sriov_config) {
 			rcu_read_unlock();
 			continue;
 		}
 		bnxt_ulp_get(ulp);
 		rcu_read_unlock();
 		ops->ulp_sriov_config(ulp->handle, num_vfs);
 		bnxt_ulp_put(ulp);
 	}
 }

 void bnxt_ulp_shutdown(struct bnxt *bp)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;
 	int i;

 	if (!edev)
 		return;

 	for (i = 0; i < BNXT_MAX_ULP; i++) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

 		ops = rtnl_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_shutdown)
 			continue;
 		ops->ulp_shutdown(ulp->handle);
 	}
 }

 void bnxt_ulp_irq_stop(struct bnxt *bp)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;

 	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 		return;

 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];

 		if (!ulp->msix_requested)
 			return;

 		ops = rtnl_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_irq_stop)
 			return;
 		ops->ulp_irq_stop(ulp->handle);
 	}
 }

 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 {
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;

 	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 		return;

 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 		struct bnxt_msix_entry *ent = NULL;

 		if (!ulp->msix_requested)
 			return;

 		ops = rtnl_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_irq_restart)
 			return;

 		if (!err) {
 			ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 				      GFP_KERNEL);
 			if (!ent)
 				return;
 			bnxt_fill_msix_vecs(bp, ent);
 		}
 		ops->ulp_irq_restart(ulp->handle, ent);
 		kfree(ent);
 	}
 }

 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 {
 	u16 event_id = le16_to_cpu(cmpl->event_id);
 	struct bnxt_en_dev *edev = bp->edev;
 	struct bnxt_ulp_ops *ops;
 	int i;

 	if (!edev)
 		return;

 	rcu_read_lock();
 	for (i = 0; i < BNXT_MAX_ULP; i++) {
 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

 		ops = rcu_dereference(ulp->ulp_ops);
 		if (!ops || !ops->ulp_async_notifier)
 			continue;
 		if (!ulp->async_events_bmap ||
 		    event_id > ulp->max_async_event_id)
 			continue;

 		/* Read max_async_event_id first before testing the bitmap. */
 		smp_rmb();
 		if (test_bit(event_id, ulp->async_events_bmap))
 			ops->ulp_async_notifier(ulp->handle, cmpl);
 	}
 	rcu_read_unlock();
 }

 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 				      unsigned long *events_bmap, u16 max_id)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_ulp *ulp;

 	if (ulp_id >= BNXT_MAX_ULP)
 		return -EINVAL;

 	ulp = &edev->ulp_tbl[ulp_id];
 	ulp->async_events_bmap = events_bmap;
 	/* Make sure bnxt_ulp_async_events() sees this order */
 	smp_wmb();
 	ulp->max_async_event_id = max_id;
 	bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
 	return 0;
 }

 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 	.bnxt_register_device	= bnxt_register_dev,
 	.bnxt_unregister_device	= bnxt_unregister_dev,
 	.bnxt_request_msix	= bnxt_req_msix_vecs,
 	.bnxt_free_msix		= bnxt_free_msix_vecs,
 	.bnxt_send_fw_msg	= bnxt_send_msg,
 	.bnxt_register_fw_async_events	= bnxt_register_async_events,
 };

 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 {
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_en_dev *edev;

 	edev = bp->edev;
 	if (!edev) {
 		edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 		if (!edev)
 			return ERR_PTR(-ENOMEM);
 		edev->en_ops = &bnxt_en_ops_tbl;
 		if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 			edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 		if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 			edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 		edev->net = dev;
 		edev->pdev = bp->pdev;
 		bp->edev = edev;
 	}
 	return bp->edev;
 }
	/* Broadcom NetXtreme-C/E network driver.
	*
	* Copyright (c) 2016-2018 Broadcom Limited
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation.
	*/

	#include <linux/module.h>

	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/interrupt.h>
	#include <linux/pci.h>
	#include <linux/netdevice.h>
	#include <linux/rtnetlink.h>
	#include <linux/bitops.h>
	#include <linux/irq.h>
	#include <asm/byteorder.h>
	#include <linux/bitmap.h>

	#include "bnxt_hsi.h"
	#include "bnxt.h"
	#include "bnxt_ulp.h"

	static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
	struct bnxt_ulp_ops ulp_ops, void handle)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);
	struct bnxt_ulp *ulp;

	ASSERT_RTNL();
	if (ulp_id >= BNXT_MAX_ULP)
	return -EINVAL;

	ulp = &edev->ulp_tbl[ulp_id];
	if (rcu_access_pointer(ulp->ulp_ops)) {
	netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
	return -EBUSY;
	}
	if (ulp_id == BNXT_ROCE_ULP) {
	unsigned int max_stat_ctxs;

	max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
	if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS \|\|
	bp->cp_nr_rings == max_stat_ctxs)
	return -ENOMEM;
	}

	atomic_set(&ulp->ref_count, 0);
	ulp->handle = handle;
	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);

	if (ulp_id == BNXT_ROCE_ULP) {
	if (test_bit(BNXT_STATE_OPEN, &bp->state))
	bnxt_hwrm_vnic_cfg(bp, 0);
	}

	return 0;
	}

	static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);
	struct bnxt_ulp *ulp;
	int i = 0;

	ASSERT_RTNL();
	if (ulp_id >= BNXT_MAX_ULP)
	return -EINVAL;

	ulp = &edev->ulp_tbl[ulp_id];
	if (!rcu_access_pointer(ulp->ulp_ops)) {
	netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
	return -EINVAL;
	}
	if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested)
	edev->en_ops->bnxt_free_msix(edev, ulp_id);

	if (ulp->max_async_event_id)
	bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0);

	RCU_INIT_POINTER(ulp->ulp_ops, NULL);
	synchronize_rcu();
	ulp->max_async_event_id = 0;
	ulp->async_events_bmap = NULL;
	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
	msleep(100);
	i++;
	}
	return 0;
	}

	static void bnxt_fill_msix_vecs(struct bnxt bp, struct bnxt_msix_entry ent)
	{
	struct bnxt_en_dev *edev = bp->edev;
	int num_msix, idx, i;

	num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
	idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
	for (i = 0; i < num_msix; i++) {
	ent[i].vector = bp->irq_tbl[idx + i].vector;
	ent[i].ring_idx = idx + i;
	ent[i].db_offset = (idx + i) * 0x80;
	}
	}

	static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
	struct bnxt_msix_entry *ent, int num_msix)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);
	int max_idx, max_cp_rings;
	int avail_msix, idx;
	int rc = 0;

	ASSERT_RTNL();
	if (ulp_id != BNXT_ROCE_ULP)
	return -EINVAL;

	if (!(bp->flags & BNXT_FLAG_USING_MSIX))
	return -ENODEV;

	if (edev->ulp_tbl[ulp_id].msix_requested)
	return -EAGAIN;

	max_cp_rings = bnxt_get_max_func_cp_rings(bp);
	avail_msix = bnxt_get_avail_msix(bp, num_msix);
	if (!avail_msix)
	return -ENOMEM;
	if (avail_msix > num_msix)
	avail_msix = num_msix;

	if (BNXT_NEW_RM(bp)) {
	idx = bp->cp_nr_rings;
	} else {
	max_idx = min_t(int, bp->total_irqs, max_cp_rings);
	idx = max_idx - avail_msix;
	}
	edev->ulp_tbl[ulp_id].msix_base = idx;
	edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
	if (bp->total_irqs < (idx + avail_msix)) {
	if (netif_running(dev)) {
	bnxt_close_nic(bp, true, false);
	rc = bnxt_open_nic(bp, true, false);
	} else {
	rc = bnxt_reserve_rings(bp, true);
	}
	}
	if (rc) {
	edev->ulp_tbl[ulp_id].msix_requested = 0;
	return -EAGAIN;
	}

	if (BNXT_NEW_RM(bp)) {
	struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
	int resv_msix;

	resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
	avail_msix = min_t(int, resv_msix, avail_msix);
	edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
	}
	bnxt_fill_msix_vecs(bp, ent);
	edev->flags \|= BNXT_EN_FLAG_MSIX_REQUESTED;
	return avail_msix;
	}

	static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);

	ASSERT_RTNL();
	if (ulp_id != BNXT_ROCE_ULP)
	return -EINVAL;

	if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
	return 0;

	edev->ulp_tbl[ulp_id].msix_requested = 0;
	edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
	if (netif_running(dev)) {
	bnxt_close_nic(bp, true, false);
	bnxt_open_nic(bp, true, false);
	}
	return 0;
	}

	int bnxt_get_ulp_msix_num(struct bnxt *bp)
	{
	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
	struct bnxt_en_dev *edev = bp->edev;

	return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
	}
	return 0;
	}

	int bnxt_get_ulp_msix_base(struct bnxt *bp)
	{
	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
	struct bnxt_en_dev *edev = bp->edev;

	if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
	return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
	}
	return 0;
	}

	int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
	{
	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
	return BNXT_MIN_ROCE_STAT_CTXS;

	return 0;
	}

	static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
	struct bnxt_fw_msg *fw_msg)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);
	struct input *req;
	int rc;

	mutex_lock(&bp->hwrm_cmd_lock);
	req = fw_msg->msg;
	req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
	rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
	fw_msg->timeout);
	if (!rc) {
	struct output *resp = bp->hwrm_cmd_resp_addr;
	u32 len = le16_to_cpu(resp->resp_len);

	if (fw_msg->resp_max_len < len)
	len = fw_msg->resp_max_len;

	memcpy(fw_msg->resp, resp, len);
	}
	mutex_unlock(&bp->hwrm_cmd_lock);
	return rc;
	}

	static void bnxt_ulp_get(struct bnxt_ulp *ulp)
	{
	atomic_inc(&ulp->ref_count);
	}

	static void bnxt_ulp_put(struct bnxt_ulp *ulp)
	{
	atomic_dec(&ulp->ref_count);
	}

	void bnxt_ulp_stop(struct bnxt *bp)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;
	int i;

	if (!edev)
	return;

	for (i = 0; i < BNXT_MAX_ULP; i++) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

	ops = rtnl_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_stop)
	continue;
	ops->ulp_stop(ulp->handle);
	}
	}

	void bnxt_ulp_start(struct bnxt *bp)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;
	int i;

	if (!edev)
	return;

	for (i = 0; i < BNXT_MAX_ULP; i++) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

	ops = rtnl_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_start)
	continue;
	ops->ulp_start(ulp->handle);
	}
	}

	void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;
	int i;

	if (!edev)
	return;

	for (i = 0; i < BNXT_MAX_ULP; i++) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

	rcu_read_lock();
	ops = rcu_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_sriov_config) {
	rcu_read_unlock();
	continue;
	}
	bnxt_ulp_get(ulp);
	rcu_read_unlock();
	ops->ulp_sriov_config(ulp->handle, num_vfs);
	bnxt_ulp_put(ulp);
	}
	}

	void bnxt_ulp_shutdown(struct bnxt *bp)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;
	int i;

	if (!edev)
	return;

	for (i = 0; i < BNXT_MAX_ULP; i++) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

	ops = rtnl_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_shutdown)
	continue;
	ops->ulp_shutdown(ulp->handle);
	}
	}

	void bnxt_ulp_irq_stop(struct bnxt *bp)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;

	if (!edev \|\| !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
	return;

	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];

	if (!ulp->msix_requested)
	return;

	ops = rtnl_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_irq_stop)
	return;
	ops->ulp_irq_stop(ulp->handle);
	}
	}

	void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
	{
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;

	if (!edev \|\| !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
	return;

	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
	struct bnxt_msix_entry *ent = NULL;

	if (!ulp->msix_requested)
	return;

	ops = rtnl_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_irq_restart)
	return;

	if (!err) {
	ent = kcalloc(ulp->msix_requested, sizeof(*ent),
	GFP_KERNEL);
	if (!ent)
	return;
	bnxt_fill_msix_vecs(bp, ent);
	}
	ops->ulp_irq_restart(ulp->handle, ent);
	kfree(ent);
	}
	}

	void bnxt_ulp_async_events(struct bnxt bp, struct hwrm_async_event_cmpl cmpl)
	{
	u16 event_id = le16_to_cpu(cmpl->event_id);
	struct bnxt_en_dev *edev = bp->edev;
	struct bnxt_ulp_ops *ops;
	int i;

	if (!edev)
	return;

	rcu_read_lock();
	for (i = 0; i < BNXT_MAX_ULP; i++) {
	struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

	ops = rcu_dereference(ulp->ulp_ops);
	if (!ops \|\| !ops->ulp_async_notifier)
	continue;
	if (!ulp->async_events_bmap \|\|
	event_id > ulp->max_async_event_id)
	continue;

	/* Read max_async_event_id first before testing the bitmap. */
	smp_rmb();
	if (test_bit(event_id, ulp->async_events_bmap))
	ops->ulp_async_notifier(ulp->handle, cmpl);
	}
	rcu_read_unlock();
	}

	static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
	unsigned long *events_bmap, u16 max_id)
	{
	struct net_device *dev = edev->net;
	struct bnxt *bp = netdev_priv(dev);
	struct bnxt_ulp *ulp;

	if (ulp_id >= BNXT_MAX_ULP)
	return -EINVAL;

	ulp = &edev->ulp_tbl[ulp_id];
	ulp->async_events_bmap = events_bmap;
	/* Make sure bnxt_ulp_async_events() sees this order */
	smp_wmb();
	ulp->max_async_event_id = max_id;
	bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
	return 0;
	}

	static const struct bnxt_en_ops bnxt_en_ops_tbl = {
	.bnxt_register_device = bnxt_register_dev,
	.bnxt_unregister_device = bnxt_unregister_dev,
	.bnxt_request_msix = bnxt_req_msix_vecs,
	.bnxt_free_msix = bnxt_free_msix_vecs,
	.bnxt_send_fw_msg = bnxt_send_msg,
	.bnxt_register_fw_async_events = bnxt_register_async_events,
	};

	struct bnxt_en_dev bnxt_ulp_probe(struct net_device dev)
	{
	struct bnxt *bp = netdev_priv(dev);
	struct bnxt_en_dev *edev;

	edev = bp->edev;
	if (!edev) {
	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
	if (!edev)
	return ERR_PTR(-ENOMEM);
	edev->en_ops = &bnxt_en_ops_tbl;
	if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
	edev->flags \|= BNXT_EN_FLAG_ROCEV1_CAP;
	if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
	edev->flags \|= BNXT_EN_FLAG_ROCEV2_CAP;
	edev->net = dev;
	edev->pdev = bp->pdev;
	bp->edev = edev;
	}
	return bp->edev;
	}