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 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright(c) 2013 - 2018 Intel Corporation. */
 
 #ifndef _IAVF_TXRX_H_
 #define _IAVF_TXRX_H_
 
 /* Interrupt Throttling and Rate Limiting Goodies */
 #define IAVF_DEFAULT_IRQ_WORK      256
 
 /* The datasheet for the X710 and XL710 indicate that the maximum value for
  * the ITR is 8160usec which is then called out as 0xFF0 with a 2usec
  * resolution. 8160 is 0x1FE0 when written out in hex. So instead of storing
  * the register value which is divided by 2 lets use the actual values and
  * avoid an excessive amount of translation.
  */
 #define IAVF_ITR_DYNAMIC    0x8000  /* use top bit as a flag */
 #define IAVF_ITR_MASK       0x1FFE  /* mask for ITR register value */
 #define IAVF_MIN_ITR             2  /* reg uses 2 usec resolution */
 #define IAVF_ITR_100K           10  /* all values below must be even */
 #define IAVF_ITR_50K            20
 #define IAVF_ITR_20K            50
 #define IAVF_ITR_18K            60
 #define IAVF_ITR_8K        122
 #define IAVF_MAX_ITR          8160  /* maximum value as per datasheet */
 #define ITR_TO_REG(setting) ((setting) & ~IAVF_ITR_DYNAMIC)
 #define ITR_REG_ALIGN(setting) __ALIGN_MASK(setting, ~IAVF_ITR_MASK)
 #define ITR_IS_DYNAMIC(setting) (!!((setting) & IAVF_ITR_DYNAMIC))
 
 #define IAVF_ITR_RX_DEF     (IAVF_ITR_20K | IAVF_ITR_DYNAMIC)
 #define IAVF_ITR_TX_DEF     (IAVF_ITR_20K | IAVF_ITR_DYNAMIC)
 
 /* 0x40 is the enable bit for interrupt rate limiting, and must be set if
  * the value of the rate limit is non-zero
  */
 #define INTRL_ENA                  BIT(6)
 #define IAVF_MAX_INTRL             0x3B    /* reg uses 4 usec resolution */
 #define INTRL_REG_TO_USEC(intrl) ((intrl & ~INTRL_ENA) << 2)
 #define INTRL_USEC_TO_REG(set) ((set) ? ((set) >> 2) | INTRL_ENA : 0)
 #define IAVF_INTRL_8K              125     /* 8000 ints/sec */
 #define IAVF_INTRL_62K             16      /* 62500 ints/sec */
 #define IAVF_INTRL_83K             12      /* 83333 ints/sec */
 
 #define IAVF_QUEUE_END_OF_LIST 0x7FF
 
 /* 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 iavf_dyn_idx_t {
     IAVF_IDX_ITR0 = 0,
     IAVF_IDX_ITR1 = 1,
     IAVF_IDX_ITR2 = 2,
     IAVF_ITR_NONE = 3   /* ITR_NONE must not be used as an index */
 };
 
 /* these are indexes into ITRN registers */
 #define IAVF_RX_ITR    IAVF_IDX_ITR0
 #define IAVF_TX_ITR    IAVF_IDX_ITR1
 #define IAVF_PE_ITR    IAVF_IDX_ITR2
 
 /* Supported RSS offloads */
 #define IAVF_DEFAULT_RSS_HENA ( \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV4_UDP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV4_SCTP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV4_TCP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV4_OTHER) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_FRAG_IPV4) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV6_UDP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV6_TCP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV6_SCTP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV6_OTHER) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_FRAG_IPV6) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_L2_PAYLOAD))
 
 #define IAVF_DEFAULT_RSS_HENA_EXPANDED (IAVF_DEFAULT_RSS_HENA | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV4_TCP_SYN_NO_ACK) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_UNICAST_IPV4_UDP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_MULTICAST_IPV4_UDP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_IPV6_TCP_SYN_NO_ACK) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_UNICAST_IPV6_UDP) | \
     BIT_ULL(IAVF_FILTER_PCTYPE_NONF_MULTICAST_IPV6_UDP))
 
 /* Supported Rx Buffer Sizes (a multiple of 128) */
 #define IAVF_RXBUFFER_256   256
 #define IAVF_RXBUFFER_1536  1536  /* 128B aligned standard Ethernet frame */
 #define IAVF_RXBUFFER_2048  2048
 #define IAVF_RXBUFFER_3072  3072  /* Used for large frames w/ padding */
 #define IAVF_MAX_RXBUFFER   9728  /* largest size for single descriptor */
 
 /* NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN means we
  * reserve 2 more, and skb_shared_info adds an additional 384 bytes more,
  * this adds up to 512 bytes of extra data meaning the smallest allocation
  * we could have is 1K.
  * i.e. RXBUFFER_256 --> 960 byte skb (size-1024 slab)
  * i.e. RXBUFFER_512 --> 1216 byte skb (size-2048 slab)
  */
 #define IAVF_RX_HDR_SIZE IAVF_RXBUFFER_256
 #define IAVF_PACKET_HDR_PAD (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
 #define iavf_rx_desc iavf_32byte_rx_desc
 
 #define IAVF_RX_DMA_ATTR \
     (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
 
 /* Attempt to maximize the headroom available for incoming frames.  We
  * use a 2K buffer for receives 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 IAVF_2K_TOO_SMALL_WITH_PADDING \
 ((NET_SKB_PAD + IAVF_RXBUFFER_1536) > SKB_WITH_OVERHEAD(IAVF_RXBUFFER_2048))
 
 static inline int iavf_compute_pad(int rx_buf_len)
 {
     int page_size, pad_size;
 
     page_size = ALIGN(rx_buf_len, PAGE_SIZE / 2);
     pad_size = SKB_WITH_OVERHEAD(page_size) - rx_buf_len;
 
     return pad_size;
 }
 
 static inline int iavf_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 (IAVF_2K_TOO_SMALL_WITH_PADDING)
         rx_buf_len = IAVF_RXBUFFER_3072 + SKB_DATA_ALIGN(NET_IP_ALIGN);
     else
         rx_buf_len = IAVF_RXBUFFER_1536;
 
     /* if needed make room for NET_IP_ALIGN */
     rx_buf_len -= NET_IP_ALIGN;
 
     return iavf_compute_pad(rx_buf_len);
 }
 
 #define IAVF_SKB_PAD iavf_skb_pad()
 #else
 #define IAVF_2K_TOO_SMALL_WITH_PADDING false
 #define IAVF_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
 #endif
 
 /**
  * iavf_test_staterr - tests bits in Rx descriptor status and error fields
  * @rx_desc: pointer to receive descriptor (in le64 format)
  * @stat_err_bits: value to mask
  *
  * This function does some fast chicanery in order to return the
  * value of the mask which is really only used for boolean tests.
  * The status_error_len doesn't need to be shifted because it begins
  * at offset zero.
  */
 static inline bool iavf_test_staterr(union iavf_rx_desc *rx_desc,
                      const u64 stat_err_bits)
 {
     return !!(rx_desc->wb.qword1.status_error_len &
           cpu_to_le64(stat_err_bits));
 }
 
 /* How many Rx Buffers do we bundle into one write to the hardware ? */
 #define IAVF_RX_INCREMENT(r, i) \
     do {                    \
         (i)++;              \
         if ((i) == (r)->count)      \
             i = 0;          \
         r->next_to_clean = i;       \
     } while (0)
 
 #define IAVF_RX_NEXT_DESC(r, i, n)      \
     do {                    \
         (i)++;              \
         if ((i) == (r)->count)      \
             i = 0;          \
         (n) = IAVF_RX_DESC((r), (i));   \
     } while (0)
 
 #define IAVF_RX_NEXT_DESC_PREFETCH(r, i, n)     \
     do {                        \
         IAVF_RX_NEXT_DESC((r), (i), (n));   \
         prefetch((n));              \
     } while (0)
 
 #define IAVF_MAX_BUFFER_TXD 8
 #define IAVF_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 IAVF_MAX_READ_REQ_SIZE      4096
 #define IAVF_MAX_DATA_PER_TXD       (16 * 1024 - 1)
 #define IAVF_MAX_DATA_PER_TXD_ALIGNED \
     (IAVF_MAX_DATA_PER_TXD & ~(IAVF_MAX_READ_REQ_SIZE - 1))
 
 /**
  * iavf_txd_use_count  - estimate the number of descriptors needed for Tx
  * @size: transmit request size in bytes
  *
  * Due to hardware alignment restrictions (4K alignment), we need to
  * assume that we can have no more than 12K of data per descriptor, even
  * though each descriptor can take up to 16K - 1 bytes of aligned memory.
  * Thus, we need to divide by 12K. But division is slow! Instead,
  * we decompose the operation into shifts and one relatively cheap
  * multiply operation.
  *
  * To divide by 12K, we first divide by 4K, then divide by 3:
  *     To divide by 4K, shift right by 12 bits
  *     To divide by 3, multiply by 85, then divide by 256
  *     (Divide by 256 is done by shifting right by 8 bits)
  * Finally, we add one to round up. Because 256 isn't an exact multiple of
  * 3, we'll underestimate near each multiple of 12K. This is actually more
  * accurate as we have 4K - 1 of wiggle room that we can fit into the last
  * segment.  For our purposes this is accurate out to 1M which is orders of
  * magnitude greater than our largest possible GSO size.
  *
  * This would then be implemented as:
  *     return (((size >> 12) * 85) >> 8) + 1;
  *
  * Since multiplication and division are commutative, we can reorder
  * operations into:
  *     return ((size * 85) >> 20) + 1;
  */
 static inline unsigned int iavf_txd_use_count(unsigned int size)
 {
     return ((size * 85) >> 20) + 1;
 }
 
 /* Tx Descriptors needed, worst case */
 #define DESC_NEEDED (MAX_SKB_FRAGS + 6)
 #define IAVF_MIN_DESC_PENDING   4
 
 #define IAVF_TX_FLAGS_HW_VLAN           BIT(1)
 #define IAVF_TX_FLAGS_SW_VLAN           BIT(2)
 #define IAVF_TX_FLAGS_TSO           BIT(3)
 #define IAVF_TX_FLAGS_IPV4          BIT(4)
 #define IAVF_TX_FLAGS_IPV6          BIT(5)
 #define IAVF_TX_FLAGS_FCCRC         BIT(6)
 #define IAVF_TX_FLAGS_FSO           BIT(7)
 #define IAVF_TX_FLAGS_FD_SB         BIT(9)
 #define IAVF_TX_FLAGS_VXLAN_TUNNEL      BIT(10)
 #define IAVF_TX_FLAGS_HW_OUTER_SINGLE_VLAN  BIT(11)
 #define IAVF_TX_FLAGS_VLAN_MASK         0xffff0000
 #define IAVF_TX_FLAGS_VLAN_PRIO_MASK        0xe0000000
 #define IAVF_TX_FLAGS_VLAN_PRIO_SHIFT       29
 #define IAVF_TX_FLAGS_VLAN_SHIFT        16
 
 struct iavf_tx_buffer {
     struct iavf_tx_desc *next_to_watch;
     union {
         struct sk_buff *skb;
         void *raw_buf;
     };
     unsigned int bytecount;
     unsigned short gso_segs;
 
     DEFINE_DMA_UNMAP_ADDR(dma);
     DEFINE_DMA_UNMAP_LEN(len);
     u32 tx_flags;
 };
 
 struct iavf_rx_buffer {
     dma_addr_t dma;
     struct page *page;
 #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
     __u32 page_offset;
 #else
     __u16 page_offset;
 #endif
     __u16 pagecnt_bias;
 };
 
 struct iavf_queue_stats {
     u64 packets;
     u64 bytes;
 };
 
 struct iavf_tx_queue_stats {
     u64 restart_queue;
     u64 tx_busy;
     u64 tx_done_old;
     u64 tx_linearize;
     u64 tx_force_wb;
     int prev_pkt_ctr;
     u64 tx_lost_interrupt;
 };
 
 struct iavf_rx_queue_stats {
     u64 non_eop_descs;
     u64 alloc_page_failed;
     u64 alloc_buff_failed;
     u64 page_reuse_count;
     u64 realloc_count;
 };
 
 enum iavf_ring_state_t {
     __IAVF_TX_FDIR_INIT_DONE,
     __IAVF_TX_XPS_INIT_DONE,
     __IAVF_RING_STATE_NBITS /* must be last */
 };
 
 /* some useful defines for virtchannel interface, which
  * is the only remaining user of header split
  */
 #define IAVF_RX_DTYPE_NO_SPLIT      0
 #define IAVF_RX_DTYPE_HEADER_SPLIT  1
 #define IAVF_RX_DTYPE_SPLIT_ALWAYS  2
 #define IAVF_RX_SPLIT_L2      0x1
 #define IAVF_RX_SPLIT_IP      0x2
 #define IAVF_RX_SPLIT_TCP_UDP 0x4
 #define IAVF_RX_SPLIT_SCTP    0x8
 
 /* struct that defines a descriptor ring, associated with a VSI */
 struct iavf_ring {
     struct iavf_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 */
     union {
         struct iavf_tx_buffer *tx_bi;
         struct iavf_rx_buffer *rx_bi;
     };
     DECLARE_BITMAP(state, __IAVF_RING_STATE_NBITS);
     u16 queue_index;        /* Queue number of ring */
     u8 dcb_tc;          /* Traffic class of ring */
     u8 __iomem *tail;
 
     /* high bit set means dynamic, use accessors routines to read/write.
      * hardware only supports 2us resolution for the ITR registers.
      * these values always store the USER setting, and must be converted
      * before programming to a register.
      */
     u16 itr_setting;
 
     u16 count;          /* Number of descriptors */
     u16 reg_idx;            /* HW register index of the ring */
     u16 rx_buf_len;
 
     /* used in interrupt processing */
     u16 next_to_use;
     u16 next_to_clean;
 
     u8 atr_sample_rate;
     u8 atr_count;
 
     bool ring_active;       /* is ring online or not */
     bool arm_wb;        /* do something to arm write back */
     u8 packet_stride;
 
     u16 flags;
 #define IAVF_TXR_FLAGS_WB_ON_ITR        BIT(0)
 #define IAVF_RXR_FLAGS_BUILD_SKB_ENABLED    BIT(1)
 #define IAVF_TXRX_FLAGS_VLAN_TAG_LOC_L2TAG1 BIT(3)
 #define IAVF_TXR_FLAGS_VLAN_TAG_LOC_L2TAG2  BIT(4)
 #define IAVF_RXR_FLAGS_VLAN_TAG_LOC_L2TAG2_2    BIT(5)
 
     /* stats structs */
     struct iavf_queue_stats stats;
     struct u64_stats_sync syncp;
     union {
         struct iavf_tx_queue_stats tx_stats;
         struct iavf_rx_queue_stats rx_stats;
     };
 
     unsigned int size;      /* length of descriptor ring in bytes */
     dma_addr_t dma;         /* physical address of ring */
 
     struct iavf_vsi *vsi;       /* Backreference to associated VSI */
     struct iavf_q_vector *q_vector; /* Backreference to associated vector */
 
     struct rcu_head rcu;        /* to avoid race on free */
     u16 next_to_alloc;
     struct sk_buff *skb;        /* When iavf_clean_rx_ring_irq() must
                      * return before it sees the EOP for
                      * the current packet, we save that skb
                      * here and resume receiving this
                      * packet the next time
                      * iavf_clean_rx_ring_irq() is called
                      * for this ring.
                      */
 } ____cacheline_internodealigned_in_smp;
 
 static inline bool ring_uses_build_skb(struct iavf_ring *ring)
 {
     return !!(ring->flags & IAVF_RXR_FLAGS_BUILD_SKB_ENABLED);
 }
 
 static inline void set_ring_build_skb_enabled(struct iavf_ring *ring)
 {
     ring->flags |= IAVF_RXR_FLAGS_BUILD_SKB_ENABLED;
 }
 
 static inline void clear_ring_build_skb_enabled(struct iavf_ring *ring)
 {
     ring->flags &= ~IAVF_RXR_FLAGS_BUILD_SKB_ENABLED;
 }
 
 #define IAVF_ITR_ADAPTIVE_MIN_INC   0x0002
 #define IAVF_ITR_ADAPTIVE_MIN_USECS 0x0002
 #define IAVF_ITR_ADAPTIVE_MAX_USECS 0x007e
 #define IAVF_ITR_ADAPTIVE_LATENCY   0x8000
 #define IAVF_ITR_ADAPTIVE_BULK      0x0000
 #define ITR_IS_BULK(x) (!((x) & IAVF_ITR_ADAPTIVE_LATENCY))
 
 struct iavf_ring_container {
     struct iavf_ring *ring;     /* pointer to linked list of ring(s) */
     unsigned long next_update;  /* jiffies value of next update */
     unsigned int total_bytes;   /* total bytes processed this int */
     unsigned int total_packets; /* total packets processed this int */
     u16 count;
     u16 target_itr;         /* target ITR setting for ring(s) */
     u16 current_itr;        /* current ITR setting for ring(s) */
 };
 
 /* iterator for handling rings in ring container */
 #define iavf_for_each_ring(pos, head) \
     for (pos = (head).ring; pos != NULL; pos = pos->next)
 
 static inline unsigned int iavf_rx_pg_order(struct iavf_ring *ring)
 {
 #if (PAGE_SIZE < 8192)
     if (ring->rx_buf_len > (PAGE_SIZE / 2))
         return 1;
 #endif
     return 0;
 }
 
 #define iavf_rx_pg_size(_ring) (PAGE_SIZE << iavf_rx_pg_order(_ring))
 
 bool iavf_alloc_rx_buffers(struct iavf_ring *rxr, u16 cleaned_count);
 netdev_tx_t iavf_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 void iavf_clean_tx_ring(struct iavf_ring *tx_ring);
 void iavf_clean_rx_ring(struct iavf_ring *rx_ring);
 int iavf_setup_tx_descriptors(struct iavf_ring *tx_ring);
 int iavf_setup_rx_descriptors(struct iavf_ring *rx_ring);
 void iavf_free_tx_resources(struct iavf_ring *tx_ring);
 void iavf_free_rx_resources(struct iavf_ring *rx_ring);
 int iavf_napi_poll(struct napi_struct *napi, int budget);
 void iavf_force_wb(struct iavf_vsi *vsi, struct iavf_q_vector *q_vector);
 u32 iavf_get_tx_pending(struct iavf_ring *ring, bool in_sw);
 void iavf_detect_recover_hung(struct iavf_vsi *vsi);
 int __iavf_maybe_stop_tx(struct iavf_ring *tx_ring, int size);
 bool __iavf_chk_linearize(struct sk_buff *skb);
 
 /**
  * iavf_xmit_descriptor_count - calculate number of Tx descriptors needed
  * @skb:     send buffer
  *
  * Returns number of data descriptors needed for this skb. Returns 0 to indicate
  * there is not enough descriptors available in this ring since we need at least
  * one descriptor.
  **/
 static inline int iavf_xmit_descriptor_count(struct sk_buff *skb)
 {
     const skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
     unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
     int count = 0, size = skb_headlen(skb);
 
     for (;;) {
         count += iavf_txd_use_count(size);
 
         if (!nr_frags--)
             break;
 
         size = skb_frag_size(frag++);
     }
 
     return count;
 }
 
 /**
  * iavf_maybe_stop_tx - 1st level check for Tx stop conditions
  * @tx_ring: the ring to be checked
  * @size:    the size buffer we want to assure is available
  *
  * Returns 0 if stop is not needed
  **/
 static inline int iavf_maybe_stop_tx(struct iavf_ring *tx_ring, int size)
 {
     if (likely(IAVF_DESC_UNUSED(tx_ring) >= size))
         return 0;
     return __iavf_maybe_stop_tx(tx_ring, size);
 }
 
 /**
  * iavf_chk_linearize - Check if there are more than 8 fragments per packet
  * @skb:      send buffer
  * @count:    number of buffers used
  *
  * Note: Our HW can't scatter-gather more than 8 fragments to build
  * a packet on the wire and so we need to figure out the cases where we
  * need to linearize the skb.
  **/
 static inline bool iavf_chk_linearize(struct sk_buff *skb, int count)
 {
     /* Both TSO and single send will work if count is less than 8 */
     if (likely(count < IAVF_MAX_BUFFER_TXD))
         return false;
 
     if (skb_is_gso(skb))
         return __iavf_chk_linearize(skb);
 
     /* we can support up to 8 data buffers for a single send */
     return count != IAVF_MAX_BUFFER_TXD;
 }
 /**
  * txring_txq - helper to convert from a ring to a queue
  * @ring: Tx ring to find the netdev equivalent of
  **/
 static inline struct netdev_queue *txring_txq(const struct iavf_ring *ring)
 {
     return netdev_get_tx_queue(ring->netdev, ring->queue_index);
 }
 #endif /* _IAVF_TXRX_H_ */

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