path: root/drivers/net/ethernet/pensando/ionic/ionic_txrx.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */

#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_vlan.h>
#include <net/ip6_checksum.h>

#include "ionic.h"
#include "ionic_lif.h"
#include "ionic_txrx.h"

static inline void ionic_txq_post(struct ionic_queue *q, bool ring_dbell,
				  ionic_desc_cb cb_func, void *cb_arg)
{
	ionic_q_post(q, ring_dbell, cb_func, cb_arg);
}

static inline void ionic_rxq_post(struct ionic_queue *q, bool ring_dbell,
				  ionic_desc_cb cb_func, void *cb_arg)
{
	ionic_q_post(q, ring_dbell, cb_func, cb_arg);
}

bool ionic_txq_poke_doorbell(struct ionic_queue *q)
{
	unsigned long now, then, dif;
	struct netdev_queue *netdev_txq;
	struct net_device *netdev;

	netdev = q->lif->netdev;
	netdev_txq = netdev_get_tx_queue(netdev, q->index);

	HARD_TX_LOCK(netdev, netdev_txq, smp_processor_id());

	if (q->tail_idx == q->head_idx) {
		HARD_TX_UNLOCK(netdev, netdev_txq);
		return false;
	}

	now = READ_ONCE(jiffies);
	then = q->dbell_jiffies;
	dif = now - then;

	if (dif > q->dbell_deadline) {
		ionic_dbell_ring(q->lif->kern_dbpage, q->hw_type,
				 q->dbval | q->head_idx);

		q->dbell_jiffies = now;
	}

	HARD_TX_UNLOCK(netdev, netdev_txq);

	return true;
}

bool ionic_rxq_poke_doorbell(struct ionic_queue *q)
{
	unsigned long now, then, dif;

	/* no lock, called from rx napi or txrx napi, nothing else can fill */

	if (q->tail_idx == q->head_idx)
		return false;

	now = READ_ONCE(jiffies);
	then = q->dbell_jiffies;
	dif = now - then;

	if (dif > q->dbell_deadline) {
		ionic_dbell_ring(q->lif->