drivers/net/ethernet/netronome/nfp/nfd3/nfd3.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
   2 /* Copyright (C) 2015-2019 Netronome Systems, Inc. */
   3
   4 #ifndef _NFP_DP_NFD3_H_
   5 #define _NFP_DP_NFD3_H_
   6
   7 struct sk_buff;
   8 struct net_device;
   9
  10 /* TX descriptor format */
  11
  12 #define NFD3_DESC_TX_EOP                BIT(7)
  13 #define NFD3_DESC_TX_OFFSET_MASK        GENMASK(6, 0)
  14 #define NFD3_DESC_TX_MSS_MASK           GENMASK(13, 0)
  15
  16 /* Flags in the host TX descriptor */
  17 #define NFD3_DESC_TX_CSUM               BIT(7)
  18 #define NFD3_DESC_TX_IP4_CSUM           BIT(6)
  19 #define NFD3_DESC_TX_TCP_CSUM           BIT(5)
  20 #define NFD3_DESC_TX_UDP_CSUM           BIT(4)
  21 #define NFD3_DESC_TX_VLAN               BIT(3)
  22 #define NFD3_DESC_TX_LSO                BIT(2)
  23 #define NFD3_DESC_TX_ENCAP              BIT(1)
  24 #define NFD3_DESC_TX_O_IP4_CSUM BIT(0)
  25
  26 struct nfp_nfd3_tx_desc {
  27         union {
  28                 struct {
  29                         u8 dma_addr_hi; /* High bits of host buf address */
  30                         __le16 dma_len; /* Length to DMA for this desc */
  31                         u8 offset_eop;  /* Offset in buf where pkt starts +
  32                                          * highest bit is eop flag.
  33                                          */
  34                         __le32 dma_addr_lo; /* Low 32bit of host buf addr */
  35
  36                         __le16 mss;     /* MSS to be used for LSO */
  37                         u8 lso_hdrlen;  /* LSO, TCP payload offset */
  38                         u8 flags;       /* TX Flags, see @NFD3_DESC_TX_* */
  39                         union {
  40                                 struct {
  41                                         u8 l3_offset; /* L3 header offset */
  42                                         u8 l4_offset; /* L4 header offset */
  43                                 };
  44                                 __le16 vlan; /* VLAN tag to add if indicated */
  45                         };
  46                         __le16 data_len; /* Length of frame + meta data */
  47                 } __packed;
  48                 __le32 vals[4];
  49                 __le64 vals8[2];
  50         };
  51 };
  52
  53 /**
  54  * struct nfp_nfd3_tx_buf - software TX buffer descriptor
  55  * @skb:        normal ring, sk_buff associated with this buffer
  56  * @frag:       XDP ring, page frag associated with this buffer
  57  * @xdp:        XSK buffer pool handle (for AF_XDP)
  58  * @dma_addr:   DMA mapping address of the buffer
  59  * @fidx:       Fragment index (-1 for the head and [0..nr_frags-1] for frags)
  60  * @pkt_cnt:    Number of packets to be produced out of the skb associated
  61  *              with this buffer (valid only on the head's buffer).
  62  *              Will be 1 for all non-TSO packets.
  63  * @is_xsk_tx:  Flag if buffer is a RX buffer after a XDP_TX action and not a
  64  *              buffer from the TX queue (for AF_XDP).
  65  * @real_len:   Number of bytes which to be produced out of the skb (valid only
  66  *              on the head's buffer). Equal to skb->len for non-TSO packets.
  67  */
  68 struct nfp_nfd3_tx_buf {
  69         union {
  70                 struct sk_buff *skb;
  71                 void *frag;
  72                 struct xdp_buff *xdp;
  73         };
  74         dma_addr_t dma_addr;
  75         union {
  76                 struct {
  77                         short int fidx;
  78                         u16 pkt_cnt;
  79                 };
  80                 struct {
  81                         bool is_xsk_tx;
  82                 };
  83         };
  84         u32 real_len;
  85 };
  86
  87 void
  88 nfp_nfd3_rx_csum(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
  89                  const struct nfp_net_rx_desc *rxd,
  90                  const struct nfp_meta_parsed *meta, struct sk_buff *skb);
  91 bool
  92 nfp_nfd3_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
  93                     void *data, void *pkt, unsigned int pkt_len, int meta_len);
  94 void nfp_nfd3_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget);
  95 int nfp_nfd3_poll(struct napi_struct *napi, int budget);
  96 netdev_tx_t nfp_nfd3_tx(struct sk_buff *skb, struct net_device *netdev);
  97 bool
  98 nfp_nfd3_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
  99                      struct sk_buff *skb, bool old);
 100 void nfp_nfd3_ctrl_poll(struct tasklet_struct *t);
 101 void nfp_nfd3_rx_ring_fill_freelist(struct nfp_net_dp *dp,
 102                                     struct nfp_net_rx_ring *rx_ring);
 103 void nfp_nfd3_xsk_tx_free(struct nfp_nfd3_tx_buf *txbuf);
 104 int nfp_nfd3_xsk_poll(struct napi_struct *napi, int budget);
 105
 106 #ifndef CONFIG_NFP_NET_IPSEC
 107 static inline void nfp_nfd3_ipsec_tx(struct nfp_nfd3_tx_desc *txd, struct sk_buff *skb)
 108 {
 109 }
 110 #else
 111 void nfp_nfd3_ipsec_tx(struct nfp_nfd3_tx_desc *txd, struct sk_buff *skb);
 112 #endif
 113
 114 #endif