1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ 2 /* Copyright (C) 2019 Netronome Systems, Inc. */ 3 4 #ifndef _NFP_DP_NFDK_H_ 5 #define _NFP_DP_NFDK_H_ 6 7 #include <linux/bitops.h> 8 #include <linux/types.h> 9 10 #define NFDK_TX_DESC_PER_SIMPLE_PKT 2 11 12 #define NFDK_TX_MAX_DATA_PER_HEAD SZ_4K 13 #define NFDK_TX_MAX_DATA_PER_DESC SZ_16K 14 #define NFDK_TX_DESC_BLOCK_SZ 256 15 #define NFDK_TX_DESC_BLOCK_CNT (NFDK_TX_DESC_BLOCK_SZ / \ 16 sizeof(struct nfp_nfdk_tx_desc)) 17 #define NFDK_TX_DESC_STOP_CNT (NFDK_TX_DESC_BLOCK_CNT * \ 18 NFDK_TX_DESC_PER_SIMPLE_PKT) 19 #define NFDK_TX_MAX_DATA_PER_BLOCK SZ_64K 20 #define NFDK_TX_DESC_GATHER_MAX 17 21 22 /* TX descriptor format */ 23 24 #define NFDK_DESC_TX_MSS_MASK GENMASK(13, 0) 25 26 #define NFDK_DESC_TX_CHAIN_META BIT(3) 27 #define NFDK_DESC_TX_ENCAP BIT(2) 28 #define NFDK_DESC_TX_L4_CSUM BIT(1) 29 #define NFDK_DESC_TX_L3_CSUM BIT(0) 30 31 #define NFDK_DESC_TX_DMA_LEN_HEAD GENMASK(11, 0) 32 #define NFDK_DESC_TX_TYPE_HEAD GENMASK(15, 12) 33 #define NFDK_DESC_TX_DMA_LEN GENMASK(13, 0) 34 #define NFDK_DESC_TX_TYPE_NOP 0 35 #define NFDK_DESC_TX_TYPE_GATHER 1 36 #define NFDK_DESC_TX_TYPE_TSO 2 37 #define NFDK_DESC_TX_TYPE_SIMPLE 8 38 #define NFDK_DESC_TX_EOP BIT(14) 39 40 #define NFDK_META_LEN GENMASK(7, 0) 41 #define NFDK_META_FIELDS GENMASK(31, 8) 42 43 #define D_BLOCK_CPL(idx) (NFDK_TX_DESC_BLOCK_CNT - \ 44 (idx) % NFDK_TX_DESC_BLOCK_CNT) 45 46 struct nfp_nfdk_tx_desc { 47 union { 48 struct { 49 u8 dma_addr_hi; /* High bits of host buf address */ 50 u8 padding; /* Must be zero */ 51 __le16 dma_len_type; /* Length to DMA for this desc */ 52 __le32 dma_addr_lo; /* Low 32bit of host buf addr */ 53 }; 54 55 struct { 56 __le16 mss; /* MSS to be used for LSO */ 57 u8 lso_hdrlen; /* LSO, TCP payload offset */ 58 u8 lso_totsegs; /* LSO, total segments */ 59 u8 l3_offset; /* L3 header offset */ 60 u8 l4_offset; /* L4 header offset */ 61 __le16 lso_meta_res; /* Rsvd bits in TSO metadata */ 62 }; 63 64 struct { 65 u8 flags; /* TX Flags, see @NFDK_DESC_TX_* */ 66 u8 reserved[7]; /* meta byte placeholder */ 67 }; 68 69 __le32 vals[2]; 70 __le64 raw; 71 }; 72 }; 73 74 /* The device don't make use of the 2 or 3 least significant bits of the address 75 * due to alignment constraints. The driver can make use of those bits to carry 76 * information about the buffer before giving it to the device. 77 * 78 * NOTE: The driver must clear the lower bits before handing the buffer to the 79 * device. 80 * 81 * - NFDK_TX_BUF_INFO_SOP - Start of a packet 82 * Mark the buffer as a start of a packet. This is used in the XDP TX process 83 * to stash virtual and DMA address so that they can be recycled when the TX 84 * operation is completed. 85 */ 86 #define NFDK_TX_BUF_PTR(val) ((val) & ~(sizeof(void *) - 1)) 87 #define NFDK_TX_BUF_INFO(val) ((val) & (sizeof(void *) - 1)) 88 #define NFDK_TX_BUF_INFO_SOP BIT(0) 89 90 struct nfp_nfdk_tx_buf { 91 union { 92 /* First slot */ 93 union { 94 struct sk_buff *skb; 95 void *frag; 96 unsigned long val; 97 }; 98 99 /* 1 + nr_frags next slots */ 100 dma_addr_t dma_addr; 101 102 /* TSO (optional) */ 103 struct { 104 u32 pkt_cnt; 105 u32 real_len; 106 }; 107 108 u64 raw; 109 }; 110 }; 111 112 static inline int nfp_nfdk_headlen_to_segs(unsigned int headlen) 113 { 114 /* First descriptor fits less data, so adjust for that */ 115 return DIV_ROUND_UP(headlen + 116 NFDK_TX_MAX_DATA_PER_DESC - 117 NFDK_TX_MAX_DATA_PER_HEAD, 118 NFDK_TX_MAX_DATA_PER_DESC); 119 } 120 121 int nfp_nfdk_poll(struct napi_struct *napi, int budget); 122 netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev); 123 bool 124 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, 125 struct sk_buff *skb, bool old); 126 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t); 127 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp, 128 struct nfp_net_rx_ring *rx_ring); 129 #endif 130