1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) Meta Platforms, Inc. and affiliates. */ 3 4 #ifndef _FBNIC_TXRX_H_ 5 #define _FBNIC_TXRX_H_ 6 7 #include <linux/netdevice.h> 8 #include <linux/skbuff.h> 9 #include <linux/types.h> 10 #include <linux/u64_stats_sync.h> 11 #include <net/xdp.h> 12 13 struct fbnic_net; 14 15 /* Guarantee we have space needed for storing the buffer 16 * To store the buffer we need: 17 * 1 descriptor per page 18 * + 1 descriptor for skb head 19 * + 2 descriptors for metadata and optional metadata 20 * + 7 descriptors to keep tail out of the same cacheline as head 21 * If we cannot guarantee that then we should return TX_BUSY 22 */ 23 #define FBNIC_MAX_SKB_DESC (MAX_SKB_FRAGS + 10) 24 #define FBNIC_TX_DESC_WAKEUP (FBNIC_MAX_SKB_DESC * 2) 25 #define FBNIC_TX_DESC_MIN roundup_pow_of_two(FBNIC_TX_DESC_WAKEUP) 26 27 #define FBNIC_MAX_TXQS 128u 28 #define FBNIC_MAX_RXQS 128u 29 30 #define FBNIC_TXQ_SIZE_DEFAULT 1024 31 #define FBNIC_HPQ_SIZE_DEFAULT 256 32 #define FBNIC_PPQ_SIZE_DEFAULT 256 33 #define FBNIC_RCQ_SIZE_DEFAULT 1024 34 35 #define FBNIC_RX_TROOM \ 36 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) 37 #define FBNIC_RX_HROOM \ 38 (ALIGN(FBNIC_RX_TROOM + NET_SKB_PAD, 128) - FBNIC_RX_TROOM) 39 #define FBNIC_RX_PAD 0 40 #define FBNIC_RX_MAX_HDR (1536 - FBNIC_RX_PAD) 41 #define FBNIC_RX_PAYLD_OFFSET 0 42 #define FBNIC_RX_PAYLD_PG_CL 0 43 44 #define FBNIC_RING_F_DISABLED BIT(0) 45 #define FBNIC_RING_F_CTX BIT(1) 46 #define FBNIC_RING_F_STATS BIT(2) /* Ring's stats may be used */ 47 48 struct fbnic_pkt_buff { 49 struct xdp_buff buff; 50 u32 data_truesize; 51 u16 data_len; 52 u16 nr_frags; 53 }; 54 55 struct fbnic_queue_stats { 56 u64 packets; 57 u64 bytes; 58 u64 dropped; 59 struct u64_stats_sync syncp; 60 }; 61 62 #define FBNIC_PAGECNT_BIAS_MAX PAGE_SIZE 63 64 struct fbnic_rx_buf { 65 struct page *page; 66 long pagecnt_bias; 67 }; 68 69 struct fbnic_ring { 70 /* Pointer to buffer specific info */ 71 union { 72 struct fbnic_pkt_buff *pkt; /* RCQ */ 73 struct fbnic_rx_buf *rx_buf; /* BDQ */ 74 void **tx_buf; /* TWQ */ 75 void *buffer; /* Generic pointer */ 76 }; 77 78 u32 __iomem *doorbell; /* Pointer to CSR space for ring */ 79 __le64 *desc; /* Descriptor ring memory */ 80 u16 size_mask; /* Size of ring in descriptors - 1 */ 81 u8 q_idx; /* Logical netdev ring index */ 82 u8 flags; /* Ring flags (FBNIC_RING_F_*) */ 83 84 u32 head, tail; /* Head/Tail of ring */ 85 86 struct fbnic_queue_stats stats; 87 88 /* Slow path fields follow */ 89 dma_addr_t dma; /* Phys addr of descriptor memory */ 90 size_t size; /* Size of descriptor ring in memory */ 91 }; 92 93 struct fbnic_q_triad { 94 struct fbnic_ring sub0, sub1, cmpl; 95 }; 96 97 struct fbnic_napi_vector { 98 struct napi_struct napi; 99 struct device *dev; /* Device for DMA unmapping */ 100 struct page_pool *page_pool; 101 struct fbnic_dev *fbd; 102 char name[IFNAMSIZ + 9]; 103 104 u16 v_idx; 105 u8 txt_count; 106 u8 rxt_count; 107 108 struct list_head napis; 109 110 struct fbnic_q_triad qt[]; 111 }; 112 113 #define FBNIC_MAX_TXQS 128u 114 #define FBNIC_MAX_RXQS 128u 115 116 netdev_tx_t fbnic_xmit_frame(struct sk_buff *skb, struct net_device *dev); 117 netdev_features_t 118 fbnic_features_check(struct sk_buff *skb, struct net_device *dev, 119 netdev_features_t features); 120 121 int fbnic_alloc_napi_vectors(struct fbnic_net *fbn); 122 void fbnic_free_napi_vectors(struct fbnic_net *fbn); 123 int fbnic_alloc_resources(struct fbnic_net *fbn); 124 void fbnic_free_resources(struct fbnic_net *fbn); 125 void fbnic_napi_enable(struct fbnic_net *fbn); 126 void fbnic_napi_disable(struct fbnic_net *fbn); 127 void fbnic_enable(struct fbnic_net *fbn); 128 void fbnic_disable(struct fbnic_net *fbn); 129 void fbnic_flush(struct fbnic_net *fbn); 130 void fbnic_fill(struct fbnic_net *fbn); 131 132 void fbnic_napi_depletion_check(struct net_device *netdev); 133 int fbnic_wait_all_queues_idle(struct fbnic_dev *fbd, bool may_fail); 134 135 #endif /* _FBNIC_TXRX_H_ */ 136