kern/drivers/net/mlx4/mlx4_en.h

/*
 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#pragma once

#include <linux/mlx4/device.h>
#include <linux/mlx4/qp.h>
#include <linux/mlx4/cq.h>
#include <linux/mlx4/srq.h>
#include <linux/mlx4/doorbell.h>
#include <linux/mlx4/cmd.h>

#include "en_port.h"
#include "mlx4_stats.h"

#define DRV_NAME	"mlx4_en"
#define DRV_VERSION	"2.2-1"
#define DRV_RELDATE	"Feb 2014"

#define MLX4_EN_MSG_LEVEL	(NETIF_MSG_LINK | NETIF_MSG_IFDOWN)

/*
 * Device constants
 */


#define MLX4_EN_PAGE_SHIFT	12
#define MLX4_EN_PAGE_SIZE	(1 << MLX4_EN_PAGE_SHIFT)
#define DEF_RX_RINGS		16
#define MAX_RX_RINGS		128
#define MIN_RX_RINGS		4
#define TXBB_SIZE		64
#define HEADROOM		(2048 / TXBB_SIZE + 1)
#define STAMP_STRIDE		64
#define STAMP_DWORDS		(STAMP_STRIDE / 4)
#define STAMP_SHIFT		31
#define STAMP_VAL		0x7fffffff
#define STATS_DELAY		(HZ / 4)
#define SERVICE_TASK_DELAY	(HZ / 4)
#define MAX_NUM_OF_FS_RULES	256

#define MLX4_EN_FILTER_HASH_SHIFT 4
#define MLX4_EN_FILTER_EXPIRY_QUOTA 60

/* Typical TSO descriptor with 16 gather entries is 352 bytes... */
#define MAX_DESC_SIZE		512
#define MAX_DESC_TXBBS		(MAX_DESC_SIZE / TXBB_SIZE)

/*
 * OS related constants and tunables
 */

#define MLX4_EN_PRIV_FLAGS_BLUEFLAME 1

#define MLX4_EN_WATCHDOG_TIMEOUT	(15 * HZ)

/* Use the maximum between 16384 and a single page */
#define MLX4_EN_ALLOC_SIZE	PAGE_ALIGN(16384)

#define MLX4_EN_ALLOC_PREFER_ORDER	PAGE_ALLOC_COSTLY_ORDER

/* Receive fragment sizes; we use at most 3 fragments (for 9600 byte MTU
 * and 4K allocations) */
enum {
	FRAG_SZ0 = 1536 - NET_IP_ALIGN,
	FRAG_SZ1 = 4096,
	FRAG_SZ2 = 4096,
	FRAG_SZ3 = MLX4_EN_ALLOC_SIZE
};
#define MLX4_EN_MAX_RX_FRAGS	4

/* Maximum ring sizes */
#define MLX4_EN_MAX_TX_SIZE	8192
#define MLX4_EN_MAX_RX_SIZE	8192

/* Minimum ring size for our page-allocation scheme to work */
#define MLX4_EN_MIN_RX_SIZE	(MLX4_EN_ALLOC_SIZE / SMP_CACHE_BYTES)
#define MLX4_EN_MIN_TX_SIZE	(4096 / TXBB_SIZE)

#define MLX4_EN_SMALL_PKT_SIZE		64
#define MLX4_EN_MIN_TX_RING_P_UP	1
#define MLX4_EN_MAX_TX_RING_P_UP	32
#define MLX4_EN_NUM_UP			8
#define MLX4_EN_DEF_TX_RING_SIZE	512
#define MLX4_EN_DEF_RX_RING_SIZE  	1024
#define MAX_TX_RINGS			(MLX4_EN_MAX_TX_RING_P_UP * \
					 MLX4_EN_NUM_UP)

#define MLX4_EN_DEFAULT_TX_WORK		256

/* Target number of packets to coalesce with interrupt moderation */
#define MLX4_EN_RX_COAL_TARGET	44
#define MLX4_EN_RX_COAL_TIME	0x10

#define MLX4_EN_TX_COAL_PKTS	16
#define MLX4_EN_TX_COAL_TIME	0x10

#define MLX4_EN_RX_RATE_LOW		400000
#define MLX4_EN_RX_COAL_TIME_LOW	0
#define MLX4_EN_RX_RATE_HIGH		450000
#define MLX4_EN_RX_COAL_TIME_HIGH	128
#define MLX4_EN_RX_SIZE_THRESH		1024
#define MLX4_EN_RX_RATE_THRESH		(1000000 / MLX4_EN_RX_COAL_TIME_HIGH)
#define MLX4_EN_SAMPLE_INTERVAL		0
#define MLX4_EN_AVG_PKT_SMALL		256

#define MLX4_EN_AUTO_CONF	0xffff

#define MLX4_EN_DEF_RX_PAUSE	1
#define MLX4_EN_DEF_TX_PAUSE	1

/* Interval between successive polls in the Tx routine when polling is used
   instead of interrupts (in per-core Tx rings) - should be power of 2 */
#define MLX4_EN_TX_POLL_MODER	16
#define MLX4_EN_TX_POLL_TIMEOUT	(HZ / 4)

#define SMALL_PACKET_SIZE      (256 - NET_IP_ALIGN)
#define HEADER_COPY_SIZE       (128 - NET_IP_ALIGN)
#define MLX4_LOOPBACK_TEST_PAYLOAD (HEADER_COPY_SIZE - ETHERHDRSIZE)

#define MLX4_EN_MIN_MTU		46
#define ETH_BCAST		0xffffffffffffULL

#define MLX4_EN_LOOPBACK_RETRIES	5
#define MLX4_EN_LOOPBACK_TIMEOUT	100

#ifdef MLX4_EN_PERF_STAT
/* Number of samples to 'average' */
#define AVG_SIZE			128
#define AVG_FACTOR			1024

#define INC_PERF_COUNTER(cnt)		(++(cnt))
#define ADD_PERF_COUNTER(cnt, add)	((cnt) += (add))
#define AVG_PERF_COUNTER(cnt, sample) \
	((cnt) = ((cnt) * (AVG_SIZE - 1) + (sample) * AVG_FACTOR) / AVG_SIZE)
#define GET_PERF_COUNTER(cnt)		(cnt)
#define GET_AVG_PERF_COUNTER(cnt)	((cnt) / AVG_FACTOR)

#else

#define INC_PERF_COUNTER(cnt)		do {} while (0)
#define ADD_PERF_COUNTER(cnt, add)	do {} while (0)
#define AVG_PERF_COUNTER(cnt, sample)	do {} while (0)
#define GET_PERF_COUNTER(cnt)		(0)
#define GET_AVG_PERF_COUNTER(cnt)	(0)
#endif /* MLX4_EN_PERF_STAT */

/* Constants for TX flow */
enum {
	MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */
	MAX_BF = 256,
	MIN_PKT_LEN = 17,
};

/*
 * Configurables
 */

enum cq_type {
	RX = 0,
	TX = 1,
};


/*
 * Useful macros
 */
#define ROUNDUP_LOG2(x)		LOG2_UP(ROUNDUPPWR2(x))
#define XNOR(x, y)		(!(x) == !(y))


struct mlx4_en_tx_info {
	struct block *block;
	dma_addr_t	map0_dma;
	uint32_t		map0_byte_count;
	uint32_t		nr_txbb;
	uint32_t		nr_bytes;
	uint8_t		linear;
	uint8_t		data_offset;
	uint8_t		inl;
	uint8_t		ts_requested;
	uint8_t		nr_maps;
} ____cacheline_aligned_in_smp;


#define MLX4_EN_BIT_DESC_OWN	0x80000000
#define CTRL_SIZE	sizeof(struct mlx4_wqe_ctrl_seg)
#define MLX4_EN_MEMTYPE_PAD	0x100
#define DS_SIZE		sizeof(struct mlx4_wqe_data_seg)


struct mlx4_en_tx_desc {
	struct mlx4_wqe_ctrl_seg ctrl;
	union {
		struct mlx4_wqe_data_seg data; /* at least one data segment */
		struct mlx4_wqe_lso_seg lso;
		struct mlx4_wqe_inline_seg inl;
	};
};

#define MLX4_EN_USE_SRQ		0x01000000

#define MLX4_EN_CX3_LOW_ID	0x1000
#define MLX4_EN_CX3_HIGH_ID	0x1005

struct mlx4_en_rx_alloc {
	struct refd_pages	*page;
	dma_addr_t	dma;
	uint32_t		page_offset;
	uint32_t		page_size;
};

struct mlx4_en_tx_ring {
	/* cache line used and dirtied in tx completion
	 * (mlx4_en_free_tx_buf())
	 */
	uint32_t			last_nr_txbb;
	uint32_t			cons;
	unsigned long		wake_queue;

	/* cache line used and dirtied in mlx4_en_xmit() */
	uint32_t			prod ____cacheline_aligned_in_smp;
	unsigned long		bytes;
	unsigned long		packets;
	unsigned long		tx_csum;
	unsigned long		tso_packets;
	unsigned long		xmit_more;
	struct mlx4_bf		bf;
	unsigned long		queue_stopped;
	struct poke_tracker	poker;

	/* Following part should be mostly read */
	cpumask_t		affinity_mask;
	struct mlx4_qp		qp;
	struct mlx4_hwq_resources wqres;
	uint32_t			size; /* number of TXBBs */
	uint32_t			size_mask;
	uint16_t			stride;
	uint16_t			cqn;	/* index of port CQ associated with this ring */
	uint32_t			buf_size;
	__be32			doorbell_qpn;
	__be32			mr_key;
	void			*buf;
	struct mlx4_en_tx_info	*tx_info;
	uint8_t			*bounce_buf;
	struct mlx4_qp_context	context;
	int			qpn;
	enum mlx4_qp_state	qp_state;
	uint8_t			queue_index;
	bool			bf_enabled;
	bool			bf_alloced;
	struct netdev_queue	*tx_queue;
	int			hwtstamp_tx_type;
} ____cacheline_aligned_in_smp;

struct mlx4_poke_args {
	struct ether		*edev;
	struct mlx4_en_priv	*priv;
	struct mlx4_en_tx_ring	*ring;
};

void __mlx4_xmit_poke(void *args);

struct mlx4_en_rx_desc {
	/* actual number of entries depends on rx ring stride */
	struct mlx4_wqe_data_seg data[0];
};

struct mlx4_en_rx_ring {
	struct mlx4_hwq_resources wqres;
	struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
	uint32_t size ;	/* number of Rx descs*/
	uint32_t actual_size;
	uint32_t size_mask;
	uint16_t stride;
	uint16_t log_stride;
	uint16_t cqn;	/* index of port CQ associated with this ring */
	uint32_t prod;
	uint32_t cons;
	uint32_t buf_size;
	uint8_t  fcs_del;
	void *buf;
	void *rx_info;
	unsigned long bytes;
	unsigned long packets;
#ifdef CONFIG_NET_RX_BUSY_POLL
	unsigned long yields;
	unsigned long misses;
	unsigned long cleaned;
#endif
	unsigned long csum_ok;
	unsigned long csum_none;
	unsigned long csum_complete;
	int hwtstamp_rx_filter;
	cpumask_var_t affinity_mask;
};

struct mlx4_en_cq {
	struct mlx4_cq          mcq;
	struct mlx4_hwq_resources wqres;
	int                     ring;
	struct ether      *dev;
	struct napi_struct	napi;
	int size;
	int buf_size;
	unsigned vector;
	enum cq_type is_tx;
	uint16_t moder_time;
	uint16_t moder_cnt;
	struct mlx4_cqe *buf;
#define MLX4_EN_OPCODE_ERROR	0x1e

#ifdef CONFIG_NET_RX_BUSY_POLL
	unsigned int state;
#define MLX4_EN_CQ_STATE_IDLE        0
#define MLX4_EN_CQ_STATE_NAPI     1    /* NAPI owns this CQ */
#define MLX4_EN_CQ_STATE_POLL     2    /* poll owns this CQ */
#define MLX4_CQ_LOCKED (MLX4_EN_CQ_STATE_NAPI | MLX4_EN_CQ_STATE_POLL)
#define MLX4_EN_CQ_STATE_NAPI_YIELD  4    /* NAPI yielded this CQ */
#define MLX4_EN_CQ_STATE_POLL_YIELD  8    /* poll yielded this CQ */
#define CQ_YIELD (MLX4_EN_CQ_STATE_NAPI_YIELD | MLX4_EN_CQ_STATE_POLL_YIELD)
#define CQ_USER_PEND (MLX4_EN_CQ_STATE_POLL | MLX4_EN_CQ_STATE_POLL_YIELD)
	spinlock_t poll_lock; /* protects from LLS/napi conflicts */
#endif  /* CONFIG_NET_RX_BUSY_POLL */
	struct irq_desc *irq_desc;
};

struct mlx4_en_port_profile {
	uint32_t flags;
	uint32_t tx_ring_num;
	uint32_t rx_ring_num;
	uint32_t tx_ring_size;
	uint32_t rx_ring_size;
	uint8_t rx_pause;
	uint8_t rx_ppp;
	uint8_t tx_pause;
	uint8_t tx_ppp;
	int rss_rings;
	int inline_thold;
};

struct mlx4_en_profile {
	int udp_rss;
	uint8_t rss_mask;
	uint32_t active_ports;
	uint32_t small_pkt_int;
	uint8_t no_reset;
	uint8_t num_tx_rings_p_up;
	struct mlx4_en_port_profile prof[MLX4_MAX_PORTS + 1];
};

struct mlx4_en_dev {
	struct mlx4_dev         *dev;
	struct pci_device		*pdev;
	qlock_t		state_lock;
	struct ether       *pndev[MLX4_MAX_PORTS + 1];
	struct ether       *upper[MLX4_MAX_PORTS + 1];
	uint32_t                     port_cnt;
	bool			device_up;
	struct mlx4_en_profile  profile;
	uint32_t			LSO_support;
	struct workqueue_struct *workqueue;
	struct device           *dma_device;
	void __iomem            *uar_map;
	struct mlx4_uar         priv_uar;
	struct mlx4_mr		mr;
	uint32_t                     priv_pdn;
	spinlock_t              uar_lock;
	uint8_t			mac_removed[MLX4_MAX_PORTS + 1];
#if 0 // AKAROS_PORT
	rwlock_t		clock_lock;
	uint32_t			nominal_c_mult;
	struct cyclecounter	cycles;
	struct timecounter	clock;
	unsigned long		last_overflow_check;
	unsigned long		overflow_period;
	struct ptp_clock	*ptp_clock;
	struct ptp_clock_info	ptp_clock_info;
	struct notifier_block	nb;
#endif
};


struct mlx4_en_rss_map {
	int base_qpn;
	struct mlx4_qp qps[MAX_RX_RINGS];
	enum mlx4_qp_state state[MAX_RX_RINGS];
	struct mlx4_qp indir_qp;
	enum mlx4_qp_state indir_state;
};

enum mlx4_en_port_flag {
	MLX4_EN_PORT_ANC = 1<<0, /* Auto-negotiation complete */
	MLX4_EN_PORT_ANE = 1<<1, /* Auto-negotiation enabled */
};

struct mlx4_en_port_state {
	int link_state;
	int link_speed;
	int transceiver;
	uint32_t flags;
};

enum mlx4_en_mclist_act {
	MCLIST_NONE,
	MCLIST_REM,
	MCLIST_ADD,
};

struct mlx4_en_mc_list {
	struct list_head	list;
	enum mlx4_en_mclist_act	action;
	uint8_t			addr[Eaddrlen];
	uint64_t			reg_id;
	uint64_t			tunnel_reg_id;
};

struct mlx4_en_frag_info {
	uint16_t frag_size;
	uint16_t frag_prefix_size;
	uint16_t frag_stride;
};

#ifdef CONFIG_MLX4_EN_DCB
/* Minimal TC BW - setting to 0 will block traffic */
#define MLX4_EN_BW_MIN 1
#define MLX4_EN_BW_MAX 100 /* Utilize 100% of the line */

#define MLX4_EN_TC_ETS 7

#endif

#if 0 // AKAROS_PORT
struct ethtool_flow_id {
	struct list_head list;
	struct ethtool_rx_flow_spec flow_spec;
	uint64_t id;
};
#endif

enum {
	MLX4_EN_FLAG_PROMISC		= (1 << 0),
	MLX4_EN_FLAG_MC_PROMISC		= (1 << 1),
	/* whether we need to enable hardware loopback by putting dmac
	 * in Tx WQE
	 */
	MLX4_EN_FLAG_ENABLE_HW_LOOPBACK	= (1 << 2),
	/* whether we need to drop packets that hardware loopback-ed */
	MLX4_EN_FLAG_RX_FILTER_NEEDED	= (1 << 3),
	MLX4_EN_FLAG_FORCE_PROMISC	= (1 << 4),
	MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP	= (1 << 5),
};

#define PORT_BEACON_MAX_LIMIT (65535)
#define MLX4_EN_MAC_HASH_SIZE (1 << BITS_PER_BYTE)
#define MLX4_EN_MAC_HASH_IDX 5

struct mlx4_en_stats_bitmap {
	DECLARE_BITMAP(bitmap, NUM_ALL_STATS);
	qlock_t mutex; /* for mutual access to stats bitmap */
};

struct mlx4_en_priv {
	struct mlx4_en_dev *mdev;
	struct mlx4_en_port_profile *prof;
	struct ether *dev;
	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
	struct netif_stats stats;
	struct netif_stats ret_stats;
	struct mlx4_en_port_state port_state;
	spinlock_t stats_lock;
#if 0 // AKAROS_PORT
	struct ethtool_flow_id ethtool_rules[MAX_NUM_OF_FS_RULES];
	/* To allow rules removal while port is going down */
	struct list_head ethtool_list;
#endif

	unsigned long last_moder_packets[MAX_RX_RINGS];
	unsigned long last_moder_tx_packets;
	unsigned long last_moder_bytes[MAX_RX_RINGS];
	unsigned long last_moder_jiffies;
	int last_moder_time[MAX_RX_RINGS];
	uint16_t rx_usecs;
	uint16_t rx_frames;
	uint16_t tx_usecs;
	uint16_t tx_frames;
	uint32_t pkt_rate_low;
	uint16_t rx_usecs_low;
	uint32_t pkt_rate_high;
	uint16_t rx_usecs_high;
	uint16_t sample_interval;
	uint16_t adaptive_rx_coal;
	uint32_t msg_enable;
	uint32_t loopback_ok;
	uint32_t validate_loopback;

	struct mlx4_hwq_resources res;
	int link_state;
	int last_link_state;
	bool port_up;
	int port;
	int registered;
	int allocated;
	int stride;
	unsigned char current_mac[Eaddrlen + 2];
	int mac_index;
	unsigned max_mtu;
	int base_qpn;
	int cqe_factor;
	int cqe_size;

	struct mlx4_en_rss_map rss_map;
	__be32 ctrl_flags;
	uint32_t flags;
	uint8_t num_tx_rings_p_up;
	uint32_t tx_work_limit;
	uint32_t tx_ring_num;
	uint32_t rx_ring_num;
	uint32_t rx_skb_size;
	struct mlx4_en_frag_info frag_info[MLX4_EN_MAX_RX_FRAGS];
	uint16_t num_frags;
	uint16_t log_rx_info;

	struct mlx4_en_tx_ring **tx_ring;
	struct mlx4_en_rx_ring *rx_ring[MAX_RX_RINGS];
	struct mlx4_en_cq **tx_cq;
	struct mlx4_en_cq *rx_cq[MAX_RX_RINGS];
	struct mlx4_qp drop_qp;
	struct work_struct rx_mode_task;
	struct work_struct watchdog_task;
	struct work_struct linkstate_task;
	struct delayed_work stats_task;
	struct delayed_work service_task;
#ifdef CONFIG_MLX4_EN_VXLAN
	struct work_struct vxlan_add_task;
	struct work_struct vxlan_del_task;
#endif
	struct mlx4_en_perf_stats pstats;
	struct mlx4_en_pkt_stats pkstats;
	struct mlx4_en_flow_stats_rx rx_priority_flowstats[MLX4_NUM_PRIORITIES];
	struct mlx4_en_flow_stats_tx tx_priority_flowstats[MLX4_NUM_PRIORITIES];
	struct mlx4_en_flow_stats_rx rx_flowstats;
	struct mlx4_en_flow_stats_tx tx_flowstats;
	struct mlx4_en_port_stats port_stats;
	struct mlx4_en_stats_bitmap stats_bitmap;
	struct list_head mc_list;
	struct list_head curr_list;
	uint64_t broadcast_id;
	struct mlx4_en_stat_out_mbox hw_stats;
	int vids[128];
	bool wol;
	struct device *ddev;
	int base_tx_qpn;
	struct hlist_head mac_hash[MLX4_EN_MAC_HASH_SIZE];
	struct hwtstamp_config hwtstamp_config;

#ifdef CONFIG_MLX4_EN_DCB
	struct ieee_ets ets;
	uint16_t maxrate[IEEE_8021QAZ_MAX_TCS];
	enum dcbnl_cndd_states cndd_state[IEEE_8021QAZ_MAX_TCS];
#endif
#ifdef CONFIG_RFS_ACCEL
	spinlock_t filters_lock;
	int last_filter_id;
	struct list_head filters;
	struct hlist_head filter_hash[1 << MLX4_EN_FILTER_HASH_SHIFT];
#endif
	uint64_t tunnel_reg_id;
	__be16 vxlan_port;

	uint32_t pflags;
	uint8_t rss_key[MLX4_EN_RSS_KEY_SIZE];
	uint8_t rss_hash_fn;
};

enum mlx4_en_wol {
	MLX4_EN_WOL_MAGIC = (1ULL << 61),
	MLX4_EN_WOL_ENABLED = (1ULL << 62),
};

struct mlx4_mac_entry {
	struct hlist_node hlist;
	unsigned char mac[Eaddrlen + 2];
	uint64_t reg_id;
#if 0 // AKAROS_PORT
	struct rcu_head rcu;
#endif
};

static inline struct mlx4_cqe *mlx4_en_get_cqe(void *buf, int idx, int cqe_sz)
{
	return buf + idx * cqe_sz;
}

static inline bool mlx4_en_ring_is_full(struct mlx4_en_tx_ring *ring)
{
	/* Check available TXBBs And 2K spare for prefetch */
	return (int)(ring->prod - ring->cons) >
	       ring->size - HEADROOM - MAX_DESC_TXBBS;
}

#ifdef CONFIG_NET_RX_BUSY_POLL
static inline void mlx4_en_cq_init_lock(struct mlx4_en_cq *cq)
{
	spinlock_init(&cq->poll_lock);
	cq->state = MLX4_EN_CQ_STATE_IDLE;
}

/* called from the device poll rutine to get ownership of a cq */
static inline bool mlx4_en_cq_lock_napi(struct mlx4_en_cq *cq)
{
	int rc = true;
	spin_lock(&cq->poll_lock);
	if (cq->state & MLX4_CQ_LOCKED) {
		warn_on(cq->state & MLX4_EN_CQ_STATE_NAPI);
		cq->state |= MLX4_EN_CQ_STATE_NAPI_YIELD;
		rc = false;
	} else
		/* we don't care if someone yielded */
		cq->state = MLX4_EN_CQ_STATE_NAPI;
	spin_unlock(&cq->poll_lock);
	return rc;
}

/* returns true is someone tried to get the cq while napi had it */
static inline bool mlx4_en_cq_unlock_napi(struct mlx4_en_cq *cq)
{
	int rc = false;
	spin_lock(&cq->poll_lock);
	warn_on(cq->state & (MLX4_EN_CQ_STATE_POLL |
			       MLX4_EN_CQ_STATE_NAPI_YIELD));

	if (cq->state & MLX4_EN_CQ_STATE_POLL_YIELD)
		rc = true;
	cq->state = MLX4_EN_CQ_STATE_IDLE;
	spin_unlock(&cq->poll_lock);
	return rc;
}

/* called from mlx4_en_low_latency_poll() */
static inline bool mlx4_en_cq_lock_poll(struct mlx4_en_cq *cq)
{
	int rc = true;
	spin_lock(&cq->poll_lock);
	if ((cq->state & MLX4_CQ_LOCKED)) {
		struct ether *dev = cq->dev;
		struct mlx4_en_priv *priv = netdev_priv(dev);
		struct mlx4_en_rx_ring *rx_ring = priv->rx_ring[cq->ring];

		cq->state |= MLX4_EN_CQ_STATE_POLL_YIELD;
		rc = false;
		rx_ring->yields++;
	} else
		/* preserve yield marks */
		cq->state |= MLX4_EN_CQ_STATE_POLL;
	spin_unlock(&cq->poll_lock);
	return rc;
}

/* returns true if someone tried to get the cq while it was locked */
static inline bool mlx4_en_cq_unlock_poll(struct mlx4_en_cq *cq)
{
	int rc = false;
	spin_lock(&cq->poll_lock);
	warn_on(cq->state & (MLX4_EN_CQ_STATE_NAPI));

	if (cq->state & MLX4_EN_CQ_STATE_POLL_YIELD)
		rc = true;
	cq->state = MLX4_EN_CQ_STATE_IDLE;
	spin_unlock(&cq->poll_lock);
	return rc;
}

/* true if a socket is polling, even if it did not get the lock */
static inline bool mlx4_en_cq_busy_polling(struct mlx4_en_cq *cq)
{
	warn_on(!(cq->state & MLX4_CQ_LOCKED));
	return cq->state & CQ_USER_PEND;
}
#else
static inline void mlx4_en_cq_init_lock(struct mlx4_en_cq *cq)
{
}

static inline bool mlx4_en_cq_lock_napi(struct mlx4_en_cq *cq)
{
	return true;
}

static inline bool mlx4_en_cq_unlock_napi(struct mlx4_en_cq *cq)
{
	return false;
}

static inline bool mlx4_en_cq_lock_poll(struct mlx4_en_cq *cq)
{
	return false;
}

static inline bool mlx4_en_cq_unlock_poll(struct mlx4_en_cq *cq)
{
	return false;
}

static inline bool mlx4_en_cq_busy_polling(struct mlx4_en_cq *cq)
{
	return false;
}
#endif /* CONFIG_NET_RX_BUSY_POLL */

#define MLX4_EN_WOL_DO_MODIFY (1ULL << 63)

void mlx4_en_update_loopback_state(struct ether *dev,
				   netdev_features_t features);

void mlx4_en_destroy_netdev(struct ether *dev);
int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
			struct ether *dev,
			struct mlx4_en_port_profile *prof);

int mlx4_en_start_port(struct ether *dev);
void mlx4_en_stop_port(struct ether *dev, int detach);

void mlx4_en_set_stats_bitmap(struct mlx4_dev *dev,
			      struct mlx4_en_stats_bitmap *stats_bitmap,
			      uint8_t rx_ppp, uint8_t rx_pause,
			      uint8_t tx_ppp, uint8_t tx_pause);

void mlx4_en_free_resources(struct mlx4_en_priv *priv);
int mlx4_en_alloc_resources(struct mlx4_en_priv *priv);

int mlx4_en_create_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq,
		      int entries, int ring, enum cq_type mode, int node);
void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq);
int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
			int cq_idx);
void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq);
int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq);
int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq);

void mlx4_en_tx_irq(struct mlx4_cq *mcq);
uint16_t mlx4_en_select_queue(struct ether *dev, struct sk_buff *skb,
			      void *accel_priv,
			      select_queue_fallback_t fallback);
netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct ether *dev);

int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
			   struct mlx4_en_tx_ring **pring,
			   uint32_t size, uint16_t stride,
			   int node, int queue_index);
void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
			     struct mlx4_en_tx_ring **pring);
int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
			     struct mlx4_en_tx_ring *ring,
			     int cq, int user_prio);
void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
				struct mlx4_en_tx_ring *ring);
void mlx4_en_set_num_rx_rings(struct mlx4_en_dev *mdev);
void mlx4_en_recover_from_oom(struct mlx4_en_priv *priv);
int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
			   struct mlx4_en_rx_ring **pring,
			   uint32_t size, uint16_t stride, int node);
void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
			     struct mlx4_en_rx_ring **pring,
			     uint32_t size, uint16_t stride);
int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv);
void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
				struct mlx4_en_rx_ring *ring);
int mlx4_en_process_rx_cq(struct ether *dev,
			  struct mlx4_en_cq *cq,
			  int budget);
void mlx4_en_fill_qp_context(struct mlx4_en_priv *priv, int size, int stride,
		int is_tx, int rss, int qpn, int cqn, int user_prio,
		struct mlx4_qp_context *context);
void mlx4_en_sqp_event(struct mlx4_qp *qp, enum mlx4_event event);
int mlx4_en_map_buffer(struct mlx4_buf *buf);
void mlx4_en_unmap_buffer(struct mlx4_buf *buf);

void mlx4_en_calc_rx_buf(struct ether *dev);
int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv);
void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv);
int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv);
void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv);
int mlx4_en_free_tx_buf(struct ether *dev, struct mlx4_en_tx_ring *ring);
void mlx4_en_rx_irq(struct mlx4_cq *mcq);

int mlx4_SET_MCAST_FLTR(struct mlx4_dev *dev, uint8_t port, uint64_t mac,
			uint64_t clear, uint8_t mode);
int mlx4_SET_VLAN_FLTR(struct mlx4_dev *dev, struct mlx4_en_priv *priv);

int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, uint8_t port,
			   uint8_t reset);
int mlx4_en_QUERY_PORT(struct mlx4_en_dev *mdev, uint8_t port);

#ifdef CONFIG_MLX4_EN_DCB
extern const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops;
extern const struct dcbnl_rtnl_ops mlx4_en_dcbnl_pfc_ops;
#endif

int mlx4_en_setup_tc(struct ether *dev, uint8_t up);

#ifdef CONFIG_RFS_ACCEL
void mlx4_en_cleanup_filters(struct mlx4_en_priv *priv);
#endif

#define MLX4_EN_NUM_SELF_TEST	5
void mlx4_en_ex_selftest(struct ether *dev, uint32_t *flags,
			 uint64_t *buf);
void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev);

#define DEV_FEATURE_CHANGED(dev, new_features, feature) \
	((dev->feat & feature) ^ (new_features & feature))

int mlx4_en_reset_config(struct ether *dev,
			 struct hwtstamp_config ts_config,
			 netdev_features_t new_features);
void mlx4_en_update_pfc_stats_bitmap(struct mlx4_dev *dev,
				     struct mlx4_en_stats_bitmap *stats_bitmap,
				     uint8_t rx_ppp, uint8_t rx_pause,
				     uint8_t tx_ppp, uint8_t tx_pause);
int mlx4_en_netdev_event(struct notifier_block *this,
			 unsigned long event, void *ptr);

/*
 * Functions for time stamping
 */
uint64_t mlx4_en_get_cqe_ts(struct mlx4_cqe *cqe);
void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
			    struct skb_shared_hwtstamps *hwts,
			    uint64_t timestamp);
void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev);
void mlx4_en_remove_timestamp(struct mlx4_en_dev *mdev);

#if 0 // AKAROS_PORT
/* Globals
 */
extern const struct ethtool_ops mlx4_en_ethtool_ops;
#endif


/*
 * printk / logging functions
 */

__printf(3, 4)
void en_print(const char *level, const struct mlx4_en_priv *priv,
	      const char *format, ...);

#if 0 // AKAROS_PORT
#define en_dbg(mlevel, priv, format, ...)				\
do {									\
	if (NETIF_MSG_##mlevel & (priv)->msg_enable)			\
		en_print(KERN_DEBUG, priv, format, ##__VA_ARGS__);	\
} while (0)
#else
#define en_dbg(mlevel, priv, format, ...)				\
do {									\
		en_print(KERN_DEBUG, priv, format, ##__VA_ARGS__);	\
} while (0)
#endif
#define en_warn(priv, format, ...)					\
	en_print(KERN_WARNING, priv, format, ##__VA_ARGS__)
#define en_err(priv, format, ...)					\
	en_print(KERN_ERR, priv, format, ##__VA_ARGS__)
#define en_info(priv, format, ...)					\
	en_print(KERN_INFO, priv, format, ##__VA_ARGS__)

#define mlx4_err(mdev, format, ...)					\
	pr_err(DRV_NAME " %s: " format,					\
	       dev_name(&(mdev)->pdev->linux_dev), ##__VA_ARGS__)
#define mlx4_info(mdev, format, ...)					\
	pr_info(DRV_NAME " %s: " format,				\
		dev_name(&(mdev)->pdev->linux_dev), ##__VA_ARGS__)
#define mlx4_warn(mdev, format, ...)					\
	pr_warn(DRV_NAME " %s: " format,				\
		dev_name(&(mdev)->pdev->linux_dev), ##__VA_ARGS__)