WIP FPC-III support

[linux/fpc-iii.git] / drivers / net / ethernet / intel / ice / ice_txrx.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018, Intel Corporation. */

#ifndef _ICE_TXRX_H_
#define _ICE_TXRX_H_

#include "ice_type.h"

#define ICE_DFLT_IRQ_WORK       256
#define ICE_RXBUF_3072          3072
#define ICE_RXBUF_2048          2048
#define ICE_RXBUF_1536          1536
#define ICE_MAX_CHAINED_RX_BUFS 5
#define ICE_MAX_BUF_TXD         8
#define ICE_MIN_TX_LEN          17

/* The size limit for a transmit buffer in a descriptor is (16K - 1).
 * In order to align with the read requests we will align the value to
 * the nearest 4K which represents our maximum read request size.
 */
#define ICE_MAX_READ_REQ_SIZE   4096
#define ICE_MAX_DATA_PER_TXD    (16 * 1024 - 1)
#define ICE_MAX_DATA_PER_TXD_ALIGNED \
        (~(ICE_MAX_READ_REQ_SIZE - 1) & ICE_MAX_DATA_PER_TXD)

#define ICE_RX_BUF_WRITE        16      /* Must be power of 2 */
#define ICE_MAX_TXQ_PER_TXQG    128

/* Attempt to maximize the headroom available for incoming frames. We use a 2K
 * buffer for MTUs <= 1500 and need 1536/1534 to store the data for the frame.
 * This leaves us with 512 bytes of room.  From that we need to deduct the
 * space needed for the shared info and the padding needed to IP align the
 * frame.
 *
 * Note: For cache line sizes 256 or larger this value is going to end
 *       up negative.  In these cases we should fall back to the legacy
 *       receive path.
 */
#if (PAGE_SIZE < 8192)
#define ICE_2K_TOO_SMALL_WITH_PADDING \
        ((unsigned int)(NET_SKB_PAD + ICE_RXBUF_1536) > \
                        SKB_WITH_OVERHEAD(ICE_RXBUF_2048))

/**
 * ice_compute_pad - compute the padding
 * @rx_buf_len: buffer length
 *
 * Figure out the size of half page based on given buffer length and
 * then subtract the skb_shared_info followed by subtraction of the
 * actual buffer length; this in turn results in the actual space that
 * is left for padding usage
 */
static inline int ice_compute_pad(int rx_buf_len)
{
        int half_page_size;

        half_page_size = ALIGN(rx_buf_len, PAGE_SIZE / 2);
        return SKB_WITH_OVERHEAD(half_page_size) - rx_buf_len;
}

/**
 * ice_skb_pad - determine the padding that we can supply
 *
 * Figure out the right Rx buffer size and based on that calculate the
 * padding
 */
static inline int ice_skb_pad(void)
{
        int rx_buf_len;

        /* If a 2K buffer cannot handle a standard Ethernet frame then
         * optimize padding for a 3K buffer instead of a 1.5K buffer.
         *
         * For a 3K buffer we need to add enough padding to allow for
         * tailroom due to NET_IP_ALIGN possibly shifting us out of
         * cache-line alignment.
         */
        if (ICE_2K_TOO_SMALL_WITH_PADDING)
                rx_buf_len = ICE_RXBUF_3072 + SKB_DATA_ALIGN(NET_IP_ALIGN);
        else
                rx_buf_len = ICE_RXBUF_1536;

        /* if needed make room for NET_IP_ALIGN */
        rx_buf_len -= NET_IP_ALIGN;

        return ice_compute_pad(rx_buf_len);
}

#define ICE_SKB_PAD ice_skb_pad()
#else
#define ICE_2K_TOO_SMALL_WITH_PADDING false
#define ICE_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
#endif

/* We are assuming that the cache line is always 64 Bytes here for ice.
 * In order to make sure that is a correct assumption there is a check in probe
 * to print a warning if the read from GLPCI_CNF2 tells us that the cache line
 * size is 128 bytes. We do it this way because we do not want to read the
 * GLPCI_CNF2 register or a variable containing the value on every pass through
 * the Tx path.
 */
#define ICE_CACHE_LINE_BYTES            64
#define ICE_DESCS_PER_CACHE_LINE        (ICE_CACHE_LINE_BYTES / \
                                         sizeof(struct ice_tx_desc))
#define ICE_DESCS_FOR_CTX_DESC          1
#define ICE_DESCS_FOR_SKB_DATA_PTR      1
/* Tx descriptors needed, worst case */
#define DESC_NEEDED (MAX_SKB_FRAGS + ICE_DESCS_FOR_CTX_DESC + \
                     ICE_DESCS_PER_CACHE_LINE + ICE_DESCS_FOR_SKB_DATA_PTR)
#define ICE_DESC_UNUSED(R)      \
        (u16)((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
              (R)->next_to_clean - (R)->next_to_use - 1)

#define ICE_TX_FLAGS_TSO        BIT(0)
#define ICE_TX_FLAGS_HW_VLAN    BIT(1)
#define ICE_TX_FLAGS_SW_VLAN    BIT(2)
/* ICE_TX_FLAGS_DUMMY_PKT is used to mark dummy packets that should be
 * freed instead of returned like skb packets.
 */
#define ICE_TX_FLAGS_DUMMY_PKT  BIT(3)
#define ICE_TX_FLAGS_IPV4       BIT(5)
#define ICE_TX_FLAGS_IPV6       BIT(6)
#define ICE_TX_FLAGS_TUNNEL     BIT(7)
#define ICE_TX_FLAGS_VLAN_M     0xffff0000
#define ICE_TX_FLAGS_VLAN_PR_M  0xe0000000
#define ICE_TX_FLAGS_VLAN_PR_S  29
#define ICE_TX_FLAGS_VLAN_S     16

#define ICE_XDP_PASS            0
#define ICE_XDP_CONSUMED        BIT(0)
#define ICE_XDP_TX              BIT(1)
#define ICE_XDP_REDIR           BIT(2)

#define ICE_RX_DMA_ATTR \
        (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)

#define ICE_ETH_PKT_HDR_PAD     (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))

#define ICE_TXD_LAST_DESC_CMD (ICE_TX_DESC_CMD_EOP | ICE_TX_DESC_CMD_RS)

struct ice_tx_buf {
        struct ice_tx_desc *next_to_watch;
        union {
                struct sk_buff *skb;
                void *raw_buf; /* used for XDP */
        };
        unsigned int bytecount;
        unsigned short gso_segs;
        u32 tx_flags;
        DEFINE_DMA_UNMAP_LEN(len);
        DEFINE_DMA_UNMAP_ADDR(dma);
};

struct ice_tx_offload_params {
        u64 cd_qw1;
        struct ice_ring *tx_ring;
        u32 td_cmd;
        u32 td_offset;
        u32 td_l2tag1;
        u32 cd_tunnel_params;
        u16 cd_l2tag2;
        u8 header_len;
};

struct ice_rx_buf {
        union {
                struct {
                        struct sk_buff *skb;
                        dma_addr_t dma;
                        struct page *page;
                        unsigned int page_offset;
                        u16 pagecnt_bias;
                };
                struct {
                        struct xdp_buff *xdp;
                };
        };
};

struct ice_q_stats {
        u64 pkts;
        u64 bytes;
};

struct ice_txq_stats {
        u64 restart_q;
        u64 tx_busy;
        u64 tx_linearize;
        int prev_pkt; /* negative if no pending Tx descriptors */
};

struct ice_rxq_stats {
        u64 non_eop_descs;
        u64 alloc_page_failed;
        u64 alloc_buf_failed;
        u64 gro_dropped; /* GRO returned dropped */
};

/* this enum matches hardware bits and is meant to be used by DYN_CTLN
 * registers and QINT registers or more generally anywhere in the manual
 * mentioning ITR_INDX, ITR_NONE cannot be used as an index 'n' into any
 * register but instead is a special value meaning "don't update" ITR0/1/2.
 */
enum ice_dyn_idx_t {
        ICE_IDX_ITR0 = 0,
        ICE_IDX_ITR1 = 1,
        ICE_IDX_ITR2 = 2,
        ICE_ITR_NONE = 3        /* ITR_NONE must not be used as an index */
};

/* Header split modes defined by DTYPE field of Rx RLAN context */
enum ice_rx_dtype {
        ICE_RX_DTYPE_NO_SPLIT           = 0,
        ICE_RX_DTYPE_HEADER_SPLIT       = 1,
        ICE_RX_DTYPE_SPLIT_ALWAYS       = 2,
};

/* indices into GLINT_ITR registers */
#define ICE_RX_ITR      ICE_IDX_ITR0
#define ICE_TX_ITR      ICE_IDX_ITR1
#define ICE_ITR_8K      124
#define ICE_ITR_20K     50
#define ICE_ITR_MAX     8160
#define ICE_DFLT_TX_ITR (ICE_ITR_20K | ICE_ITR_DYNAMIC)
#define ICE_DFLT_RX_ITR (ICE_ITR_20K | ICE_ITR_DYNAMIC)
#define ICE_ITR_DYNAMIC 0x8000  /* used as flag for itr_setting */
#define ITR_IS_DYNAMIC(setting) (!!((setting) & ICE_ITR_DYNAMIC))
#define ITR_TO_REG(setting)     ((setting) & ~ICE_ITR_DYNAMIC)
#define ICE_ITR_GRAN_S          1       /* ITR granularity is always 2us */
#define ICE_ITR_GRAN_US         BIT(ICE_ITR_GRAN_S)
#define ICE_ITR_MASK            0x1FFE  /* ITR register value alignment mask */
#define ITR_REG_ALIGN(setting)  ((setting) & ICE_ITR_MASK)

#define ICE_ITR_ADAPTIVE_MIN_INC        0x0002
#define ICE_ITR_ADAPTIVE_MIN_USECS      0x0002
#define ICE_ITR_ADAPTIVE_MAX_USECS      0x00FA
#define ICE_ITR_ADAPTIVE_LATENCY        0x8000
#define ICE_ITR_ADAPTIVE_BULK           0x0000

#define ICE_DFLT_INTRL  0
#define ICE_MAX_INTRL   236

#define ICE_WB_ON_ITR_USECS     2
#define ICE_IN_WB_ON_ITR_MODE   255
/* Sets WB_ON_ITR and assumes INTENA bit is already cleared, which allows
 * setting the MSK_M bit to tell hardware to ignore the INTENA_M bit. Also,
 * set the write-back latency to the usecs passed in.
 */
#define ICE_GLINT_DYN_CTL_WB_ON_ITR(usecs, itr_idx)     \
        ((((usecs) << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S)) & \
          GLINT_DYN_CTL_INTERVAL_M) | \
         (((itr_idx) << GLINT_DYN_CTL_ITR_INDX_S) & \
          GLINT_DYN_CTL_ITR_INDX_M) | GLINT_DYN_CTL_INTENA_MSK_M | \
         GLINT_DYN_CTL_WB_ON_ITR_M)

/* Legacy or Advanced Mode Queue */
#define ICE_TX_ADVANCED 0
#define ICE_TX_LEGACY   1

/* descriptor ring, associated with a VSI */
struct ice_ring {
        /* CL1 - 1st cacheline starts here */
        struct ice_ring *next;          /* pointer to next ring in q_vector */
        void *desc;                     /* Descriptor ring memory */
        struct device *dev;             /* Used for DMA mapping */
        struct net_device *netdev;      /* netdev ring maps to */
        struct ice_vsi *vsi;            /* Backreference to associated VSI */
        struct ice_q_vector *q_vector;  /* Backreference to associated vector */
        u8 __iomem *tail;
        union {
                struct ice_tx_buf *tx_buf;
                struct ice_rx_buf *rx_buf;
        };
        /* CL2 - 2nd cacheline starts here */
        u16 q_index;                    /* Queue number of ring */
        u16 q_handle;                   /* Queue handle per TC */

        u8 ring_active:1;               /* is ring online or not */

        u16 count;                      /* Number of descriptors */
        u16 reg_idx;                    /* HW register index of the ring */

        /* used in interrupt processing */
        u16 next_to_use;
        u16 next_to_clean;
        u16 next_to_alloc;

        /* stats structs */
        struct ice_q_stats      stats;
        struct u64_stats_sync syncp;
        union {
                struct ice_txq_stats tx_stats;
                struct ice_rxq_stats rx_stats;
        };

        struct rcu_head rcu;            /* to avoid race on free */
        struct bpf_prog *xdp_prog;
        struct xsk_buff_pool *xsk_pool;
        /* CL3 - 3rd cacheline starts here */
        struct xdp_rxq_info xdp_rxq;
        /* CLX - the below items are only accessed infrequently and should be
         * in their own cache line if possible
         */
#define ICE_TX_FLAGS_RING_XDP           BIT(0)
#define ICE_RX_FLAGS_RING_BUILD_SKB     BIT(1)
        u8 flags;
        dma_addr_t dma;                 /* physical address of ring */
        unsigned int size;              /* length of descriptor ring in bytes */
        u32 txq_teid;                   /* Added Tx queue TEID */
        u16 rx_buf_len;
        u8 dcb_tc;                      /* Traffic class of ring */
} ____cacheline_internodealigned_in_smp;

static inline bool ice_ring_uses_build_skb(struct ice_ring *ring)
{
        return !!(ring->flags & ICE_RX_FLAGS_RING_BUILD_SKB);
}

static inline void ice_set_ring_build_skb_ena(struct ice_ring *ring)
{
        ring->flags |= ICE_RX_FLAGS_RING_BUILD_SKB;
}

static inline void ice_clear_ring_build_skb_ena(struct ice_ring *ring)
{
        ring->flags &= ~ICE_RX_FLAGS_RING_BUILD_SKB;
}

static inline bool ice_ring_is_xdp(struct ice_ring *ring)
{
        return !!(ring->flags & ICE_TX_FLAGS_RING_XDP);
}

struct ice_ring_container {
        /* head of linked-list of rings */
        struct ice_ring *ring;
        unsigned long next_update;      /* jiffies value of next queue update */
        unsigned int total_bytes;       /* total bytes processed this int */
        unsigned int total_pkts;        /* total packets processed this int */
        u16 itr_idx;            /* index in the interrupt vector */
        u16 target_itr;         /* value in usecs divided by the hw->itr_gran */
        u16 current_itr;        /* value in usecs divided by the hw->itr_gran */
        /* high bit set means dynamic ITR, rest is used to store user
         * readable ITR value in usecs and must be converted before programming
         * to a register.
         */
        u16 itr_setting;
};

struct ice_coalesce_stored {
        u16 itr_tx;
        u16 itr_rx;
        u8 intrl;
};

/* iterator for handling rings in ring container */
#define ice_for_each_ring(pos, head) \
        for (pos = (head).ring; pos; pos = pos->next)

static inline unsigned int ice_rx_pg_order(struct ice_ring *ring)
{
#if (PAGE_SIZE < 8192)
        if (ring->rx_buf_len > (PAGE_SIZE / 2))
                return 1;
#endif
        return 0;
}

#define ice_rx_pg_size(_ring) (PAGE_SIZE << ice_rx_pg_order(_ring))

union ice_32b_rx_flex_desc;

bool ice_alloc_rx_bufs(struct ice_ring *rxr, u16 cleaned_count);
netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev);
void ice_clean_tx_ring(struct ice_ring *tx_ring);
void ice_clean_rx_ring(struct ice_ring *rx_ring);
int ice_setup_tx_ring(struct ice_ring *tx_ring);
int ice_setup_rx_ring(struct ice_ring *rx_ring);
void ice_free_tx_ring(struct ice_ring *tx_ring);
void ice_free_rx_ring(struct ice_ring *rx_ring);
int ice_napi_poll(struct napi_struct *napi, int budget);
int
ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc,
                   u8 *raw_packet);
int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget);
void ice_clean_ctrl_tx_irq(struct ice_ring *tx_ring);
#endif /* _ICE_TXRX_H_ */