/*
 * Linux driver for VMware's vmxnet3 ethernet NIC.
 *
 * Copyright (C) 2008-2016, VMware, Inc. All Rights Reserved.
 *
 * 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; version 2 of the License and no later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Maintained by: pv-drivers@vmware.com
 *
 */

#ifndef _VMXNET3_INT_H
#define _VMXNET3_INT_H

#include <linux/bitops.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/highmem.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/uaccess.h>
#include <asm/dma.h>
#include <asm/page.h>

#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/etherdevice.h>
#include <asm/checksum.h>
#include <linux/if_vlan.h>
#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/log2.h>

#include "vmxnet3_defs.h"

#ifdef DEBUG
# define VMXNET3_DRIVER_VERSION_REPORT VMXNET3_DRIVER_VERSION_STRING"-NAPI(debug)"
#else
# define VMXNET3_DRIVER_VERSION_REPORT VMXNET3_DRIVER_VERSION_STRING"-NAPI"
#endif


/*
 * Version numbers
 */
#define VMXNET3_DRIVER_VERSION_STRING   "1.4.a.0-k"

/* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
#define VMXNET3_DRIVER_VERSION_NUM      0x01040a00

#if defined(CONFIG_PCI_MSI)
        /* RSS only makes sense if MSI-X is supported. */
        #define VMXNET3_RSS
#endif

#define VMXNET3_REV_3           2       /* Vmxnet3 Rev. 3 */
#define VMXNET3_REV_2           1       /* Vmxnet3 Rev. 2 */
#define VMXNET3_REV_1           0       /* Vmxnet3 Rev. 1 */

/*
 * Capabilities
 */

enum {
        VMNET_CAP_SG            = 0x0001, /* Can do scatter-gather transmits. */
        VMNET_CAP_IP4_CSUM      = 0x0002, /* Can checksum only TCP/UDP over
                                           * IPv4 */
        VMNET_CAP_HW_CSUM       = 0x0004, /* Can checksum all packets. */
        VMNET_CAP_HIGH_DMA      = 0x0008, /* Can DMA to high memory. */
        VMNET_CAP_TOE           = 0x0010, /* Supports TCP/IP offload. */
        VMNET_CAP_TSO           = 0x0020, /* Supports TCP Segmentation
                                           * offload */
        VMNET_CAP_SW_TSO        = 0x0040, /* Supports SW TCP Segmentation */
        VMNET_CAP_VMXNET_APROM  = 0x0080, /* Vmxnet APROM support */
        VMNET_CAP_HW_TX_VLAN    = 0x0100, /* Can we do VLAN tagging in HW */
        VMNET_CAP_HW_RX_VLAN    = 0x0200, /* Can we do VLAN untagging in HW */
        VMNET_CAP_SW_VLAN       = 0x0400, /* VLAN tagging/untagging in SW */
        VMNET_CAP_WAKE_PCKT_RCV = 0x0800, /* Can wake on network packet recv? */
        VMNET_CAP_ENABLE_INT_INLINE = 0x1000,  /* Enable Interrupt Inline */
        VMNET_CAP_ENABLE_HEADER_COPY = 0x2000,  /* copy header for vmkernel */
        VMNET_CAP_TX_CHAIN      = 0x4000, /* Guest can use multiple tx entries
                                          * for a pkt */
        VMNET_CAP_RX_CHAIN      = 0x8000, /* pkt can span multiple rx entries */
        VMNET_CAP_LPD           = 0x10000, /* large pkt delivery */
        VMNET_CAP_BPF           = 0x20000, /* BPF Support in VMXNET Virtual HW*/
        VMNET_CAP_SG_SPAN_PAGES = 0x40000, /* Scatter-gather can span multiple*/
                                           /* pages transmits */
        VMNET_CAP_IP6_CSUM      = 0x80000, /* Can do IPv6 csum offload. */
        VMNET_CAP_TSO6         = 0x100000, /* TSO seg. offload for IPv6 pkts. */
        VMNET_CAP_TSO256k      = 0x200000, /* Can do TSO seg offload for */
                                           /* pkts up to 256kB. */
        VMNET_CAP_UPT          = 0x400000  /* Support UPT */
};

/*
 * Maximum devices supported.
 */
#define MAX_ETHERNET_CARDS              10
#define MAX_PCI_PASSTHRU_DEVICE         6

struct vmxnet3_cmd_ring {
        union Vmxnet3_GenericDesc *base;
        u32             size;
        u32             next2fill;
        u32             next2comp;
        u8              gen;
        dma_addr_t      basePA;
};

static inline void
vmxnet3_cmd_ring_adv_next2fill(struct vmxnet3_cmd_ring *ring)
{
        ring->next2fill++;
        if (unlikely(ring->next2fill == ring->size)) {
                ring->next2fill = 0;
                VMXNET3_FLIP_RING_GEN(ring->gen);
        }
}

static inline void
vmxnet3_cmd_ring_adv_next2comp(struct vmxnet3_cmd_ring *ring)
{
        VMXNET3_INC_RING_IDX_ONLY(ring->next2comp, ring->size);
}

static inline int
vmxnet3_cmd_ring_desc_avail(struct vmxnet3_cmd_ring *ring)
{
        return (ring->next2comp > ring->next2fill ? 0 : ring->size) +
                ring->next2comp - ring->next2fill - 1;
}

struct vmxnet3_comp_ring {
        union Vmxnet3_GenericDesc *base;
        u32               size;
        u32               next2proc;
        u8                gen;
        u8                intr_idx;
        dma_addr_t           basePA;
};

static inline void
vmxnet3_comp_ring_adv_next2proc(struct vmxnet3_comp_ring *ring)
{
        ring->next2proc++;
        if (unlikely(ring->next2proc == ring->size)) {
                ring->next2proc = 0;
                VMXNET3_FLIP_RING_GEN(ring->gen);
        }
}

struct vmxnet3_tx_data_ring {
        struct Vmxnet3_TxDataDesc *base;
        u32              size;
        dma_addr_t          basePA;
};

enum vmxnet3_buf_map_type {
        VMXNET3_MAP_INVALID = 0,
        VMXNET3_MAP_NONE,
        VMXNET3_MAP_SINGLE,
        VMXNET3_MAP_PAGE,
};

struct vmxnet3_tx_buf_info {
        u32      map_type;
        u16      len;
        u16      sop_idx;
        dma_addr_t  dma_addr;
        struct sk_buff *skb;
};

struct vmxnet3_tq_driver_stats {
        u64 drop_total;     /* # of pkts dropped by the driver, the
                                * counters below track droppings due to
                                * different reasons
                                */
        u64 drop_too_many_frags;
        u64 drop_oversized_hdr;
        u64 drop_hdr_inspect_err;
        u64 drop_tso;

        u64 tx_ring_full;
        u64 linearized;         /* # of pkts linearized */
        u64 copy_skb_header;    /* # of times we have to copy skb header */
        u64 oversized_hdr;
};

struct vmxnet3_tx_ctx {
        bool   ipv4;
        bool   ipv6;
        u16 mss;
        u32 eth_ip_hdr_size; /* only valid for pkts requesting tso or csum
                                 * offloading
                                 */
        u32 l4_hdr_size;     /* only valid if mss != 0 */
        u32 copy_size;       /* # of bytes copied into the data ring */
        union Vmxnet3_GenericDesc *sop_txd;
        union Vmxnet3_GenericDesc *eop_txd;
};

struct vmxnet3_tx_queue {
        char                    name[IFNAMSIZ+8]; /* To identify interrupt */
        struct vmxnet3_adapter          *adapter;
        spinlock_t                      tx_lock;
        struct vmxnet3_cmd_ring         tx_ring;
        struct vmxnet3_tx_buf_info      *buf_info;
        dma_addr_t                       buf_info_pa;
        struct vmxnet3_tx_data_ring     data_ring;
        struct vmxnet3_comp_ring        comp_ring;
        struct Vmxnet3_TxQueueCtrl      *shared;
        struct vmxnet3_tq_driver_stats  stats;
        bool                            stopped;
        int                             num_stop;  /* # of times the queue is
                                                    * stopped */
        int                             qid;
        u16                             txdata_desc_size;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));

enum vmxnet3_rx_buf_type {
        VMXNET3_RX_BUF_NONE = 0,
        VMXNET3_RX_BUF_SKB = 1,
        VMXNET3_RX_BUF_PAGE = 2
};

struct vmxnet3_rx_buf_info {
        enum vmxnet3_rx_buf_type buf_type;
        u16     len;
        union {
                struct sk_buff *skb;
                struct page    *page;
        };
        dma_addr_t dma_addr;
};

struct vmxnet3_rx_ctx {
        struct sk_buff *skb;
        u32 sop_idx;
};

struct vmxnet3_rq_driver_stats {
        u64 drop_total;
        u64 drop_err;
        u64 drop_fcs;
        u64 rx_buf_alloc_failure;
};

struct vmxnet3_rx_data_ring {
        Vmxnet3_RxDataDesc *base;
        dma_addr_t basePA;
        u16 desc_size;
};

struct vmxnet3_rx_queue {
        char                    name[IFNAMSIZ + 8]; /* To identify interrupt */
        struct vmxnet3_adapter    *adapter;
        struct napi_struct        napi;
        struct vmxnet3_cmd_ring   rx_ring[2];
        struct vmxnet3_rx_data_ring data_ring;
        struct vmxnet3_comp_ring  comp_ring;
        struct vmxnet3_rx_ctx     rx_ctx;
        u32 qid;            /* rqID in RCD for buffer from 1st ring */
        u32 qid2;           /* rqID in RCD for buffer from 2nd ring */
        u32 dataRingQid;    /* rqID in RCD for buffer from data ring */
        struct vmxnet3_rx_buf_info     *buf_info[2];
        dma_addr_t                      buf_info_pa;
        struct Vmxnet3_RxQueueCtrl            *shared;
        struct vmxnet3_rq_driver_stats  stats;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));

#define VMXNET3_DEVICE_MAX_TX_QUEUES 8
#define VMXNET3_DEVICE_MAX_RX_QUEUES 8   /* Keep this value as a power of 2 */

/* Should be less than UPT1_RSS_MAX_IND_TABLE_SIZE */
#define VMXNET3_RSS_IND_TABLE_SIZE (VMXNET3_DEVICE_MAX_RX_QUEUES * 4)

#define VMXNET3_LINUX_MAX_MSIX_VECT     (VMXNET3_DEVICE_MAX_TX_QUEUES + \
                                         VMXNET3_DEVICE_MAX_RX_QUEUES + 1)
#define VMXNET3_LINUX_MIN_MSIX_VECT     2 /* 1 for tx-rx pair and 1 for event */


struct vmxnet3_intr {
        enum vmxnet3_intr_mask_mode  mask_mode;
        enum vmxnet3_intr_type       type;      /* MSI-X, MSI, or INTx? */
        u8  num_intrs;                  /* # of intr vectors */
        u8  event_intr_idx;             /* idx of the intr vector for event */
        u8  mod_levels[VMXNET3_LINUX_MAX_MSIX_VECT]; /* moderation level */
        char    event_msi_vector_name[IFNAMSIZ+11];
#ifdef CONFIG_PCI_MSI
        struct msix_entry msix_entries[VMXNET3_LINUX_MAX_MSIX_VECT];
#endif
};

/* Interrupt sharing schemes, share_intr */
#define VMXNET3_INTR_BUDDYSHARE 0    /* Corresponding tx,rx queues share irq */
#define VMXNET3_INTR_TXSHARE 1       /* All tx queues share one irq */
#define VMXNET3_INTR_DONTSHARE 2     /* each queue has its own irq */


#define VMXNET3_STATE_BIT_RESETTING   0
#define VMXNET3_STATE_BIT_QUIESCED    1
struct vmxnet3_adapter {
        struct vmxnet3_tx_queue         tx_queue[VMXNET3_DEVICE_MAX_TX_QUEUES];
        struct vmxnet3_rx_queue         rx_queue[VMXNET3_DEVICE_MAX_RX_QUEUES];
        unsigned long                   active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
        struct vmxnet3_intr             intr;
        spinlock_t                      cmd_lock;
        struct Vmxnet3_DriverShared     *shared;
        struct Vmxnet3_PMConf           *pm_conf;
        struct Vmxnet3_TxQueueDesc      *tqd_start;     /* all tx queue desc */
        struct Vmxnet3_RxQueueDesc      *rqd_start;     /* all rx queue desc */
        struct net_device               *netdev;
        struct pci_dev                  *pdev;

        u8                      __iomem *hw_addr0; /* for BAR 0 */
        u8                      __iomem *hw_addr1; /* for BAR 1 */
        u8                              version;

        bool                            rxcsum;
        bool                            lro;

#ifdef VMXNET3_RSS
        struct UPT1_RSSConf             *rss_conf;
        bool                            rss;
#endif
        u32                             num_rx_queues;
        u32                             num_tx_queues;

        /* rx buffer related */
        unsigned                        skb_buf_size;
        int             rx_buf_per_pkt;  /* only apply to the 1st ring */
        dma_addr_t                      shared_pa;
        dma_addr_t queue_desc_pa;
        dma_addr_t coal_conf_pa;

        /* Wake-on-LAN */
        u32     wol;

        /* Link speed */
        u32     link_speed; /* in mbps */

        u64     tx_timeout_count;

        /* Ring sizes */
        u32 tx_ring_size;
        u32 rx_ring_size;
        u32 rx_ring2_size;

        /* Size of buffer in the data ring */
        u16 txdata_desc_size;
        u16 rxdata_desc_size;

        bool rxdataring_enabled;

        struct work_struct work;

        unsigned long  state;    /* VMXNET3_STATE_BIT_xxx */

        int share_intr;

        struct Vmxnet3_CoalesceScheme *coal_conf;
        bool   default_coal_mode;

        dma_addr_t adapter_pa;
        dma_addr_t pm_conf_pa;
        dma_addr_t rss_conf_pa;
};

#define VMXNET3_WRITE_BAR0_REG(adapter, reg, val)  \
        writel((val), (adapter)->hw_addr0 + (reg))
#define VMXNET3_READ_BAR0_REG(adapter, reg)        \
        readl((adapter)->hw_addr0 + (reg))

#define VMXNET3_WRITE_BAR1_REG(adapter, reg, val)  \
        writel((val), (adapter)->hw_addr1 + (reg))
#define VMXNET3_READ_BAR1_REG(adapter, reg)        \
        readl((adapter)->hw_addr1 + (reg))

#define VMXNET3_WAKE_QUEUE_THRESHOLD(tq)  (5)
#define VMXNET3_RX_ALLOC_THRESHOLD(rq, ring_idx, adapter) \
        ((rq)->rx_ring[ring_idx].size >> 3)

#define VMXNET3_GET_ADDR_LO(dma)   ((u32)(dma))
#define VMXNET3_GET_ADDR_HI(dma)   ((u32)(((u64)(dma)) >> 32))

#define VMXNET3_VERSION_GE_2(adapter) \
        (adapter->version >= VMXNET3_REV_2 + 1)
#define VMXNET3_VERSION_GE_3(adapter) \
        (adapter->version >= VMXNET3_REV_3 + 1)

/* must be a multiple of VMXNET3_RING_SIZE_ALIGN */
#define VMXNET3_DEF_TX_RING_SIZE    512
#define VMXNET3_DEF_RX_RING_SIZE    256
#define VMXNET3_DEF_RX_RING2_SIZE   128

#define VMXNET3_DEF_RXDATA_DESC_SIZE 128

#define VMXNET3_MAX_ETH_HDR_SIZE    22
#define VMXNET3_MAX_SKB_BUF_SIZE    (3*1024)

#define VMXNET3_GET_RING_IDX(adapter, rqID)             \
        ((rqID >= adapter->num_rx_queues &&             \
         rqID < 2 * adapter->num_rx_queues) ? 1 : 0)    \

#define VMXNET3_RX_DATA_RING(adapter, rqID)             \
        (rqID >= 2 * adapter->num_rx_queues &&          \
        rqID < 3 * adapter->num_rx_queues)              \

#define VMXNET3_COAL_STATIC_DEFAULT_DEPTH       64

#define VMXNET3_COAL_RBC_RATE(usecs) (1000000 / usecs)
#define VMXNET3_COAL_RBC_USECS(rbc_rate) (1000000 / rbc_rate)

int
vmxnet3_quiesce_dev(struct vmxnet3_adapter *adapter);

int
vmxnet3_activate_dev(struct vmxnet3_adapter *adapter);

void
vmxnet3_force_close(struct vmxnet3_adapter *adapter);

void
vmxnet3_reset_dev(struct vmxnet3_adapter *adapter);

void
vmxnet3_tq_destroy_all(struct vmxnet3_adapter *adapter);

void
vmxnet3_rq_destroy_all(struct vmxnet3_adapter *adapter);

int
vmxnet3_set_features(struct net_device *netdev, netdev_features_t features);

int
vmxnet3_create_queues(struct vmxnet3_adapter *adapter,
                      u32 tx_ring_size, u32 rx_ring_size, u32 rx_ring2_size,
                      u16 txdata_desc_size, u16 rxdata_desc_size);

void vmxnet3_set_ethtool_ops(struct net_device *netdev);

void vmxnet3_get_stats64(struct net_device *dev,
                         struct rtnl_link_stats64 *stats);

extern char vmxnet3_driver_name[];
#endif