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 #define FBNIC_TX_USECS_DEFAULT 35 35 #define FBNIC_RX_USECS_DEFAULT 30 36 #define FBNIC_RX_FRAMES_DEFAULT 0 37 38 #define FBNIC_RX_TROOM \ 39 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) 40 #define FBNIC_RX_HROOM \ 41 (ALIGN(FBNIC_RX_TROOM + NET_SKB_PAD, 128) - FBNIC_RX_TROOM) 42 #define FBNIC_RX_PAD 0 43 #define FBNIC_RX_MAX_HDR (1536 - FBNIC_RX_PAD) 44 #define FBNIC_RX_PAYLD_OFFSET 0 45 #define FBNIC_RX_PAYLD_PG_CL 0 46 47 #define FBNIC_RING_F_DISABLED BIT(0) 48 #define FBNIC_RING_F_CTX BIT(1) 49 #define FBNIC_RING_F_STATS BIT(2) /* Ring's stats may be used */ 50 51 struct fbnic_pkt_buff { 52 struct xdp_buff buff; 53 ktime_t hwtstamp; 54 u32 data_truesize; 55 u16 data_len; 56 u16 nr_frags; 57 }; 58 59 struct fbnic_queue_stats { 60 u64 packets; 61 u64 bytes; 62 union { 63 struct { 64 u64 csum_partial; 65 u64 lso; 66 u64 ts_packets; 67 u64 ts_lost; 68 u64 stop; 69 u64 wake; 70 } twq; 71 struct { 72 u64 alloc_failed; 73 u64 csum_complete; 74 u64 csum_none; 75 } rx; 76 }; 77 u64 dropped; 78 struct u64_stats_sync syncp; 79 }; 80 81 /* Pagecnt bias is long max to reserve the last bit to catch overflow 82 * cases where if we overcharge the bias it will flip over to be negative. 83 */ 84 #define PAGECNT_BIAS_MAX LONG_MAX 85 struct fbnic_rx_buf { 86 struct page *page; 87 long pagecnt_bias; 88 }; 89 90 struct fbnic_ring { 91 /* Pointer to buffer specific info */ 92 union { 93 struct fbnic_pkt_buff *pkt; /* RCQ */ 94 struct fbnic_rx_buf *rx_buf; /* BDQ */ 95 void **tx_buf; /* TWQ */ 96 void *buffer; /* Generic pointer */ 97 }; 98 99 u32 __iomem *doorbell; /* Pointer to CSR space for ring */ 100 __le64 *desc; /* Descriptor ring memory */ 101 u16 size_mask; /* Size of ring in descriptors - 1 */ 102 u8 q_idx; /* Logical netdev ring index */ 103 u8 flags; /* Ring flags (FBNIC_RING_F_*) */ 104 105 u32 head, tail; /* Head/Tail of ring */ 106 107 struct fbnic_queue_stats stats; 108 109 /* Slow path fields follow */ 110 dma_addr_t dma; /* Phys addr of descriptor memory */ 111 size_t size; /* Size of descriptor ring in memory */ 112 }; 113 114 struct fbnic_q_triad { 115 struct fbnic_ring sub0, sub1, cmpl; 116 }; 117 118 struct fbnic_napi_vector { 119 struct napi_struct napi; 120 struct device *dev; /* Device for DMA unmapping */ 121 struct page_pool *page_pool; 122 struct fbnic_dev *fbd; 123 124 u16 v_idx; 125 u8 txt_count; 126 u8 rxt_count; 127 128 struct fbnic_q_triad qt[]; 129 }; 130 131 #define FBNIC_MAX_TXQS 128u 132 #define FBNIC_MAX_RXQS 128u 133 134 netdev_tx_t fbnic_xmit_frame(struct sk_buff *skb, struct net_device *dev); 135 netdev_features_t 136 fbnic_features_check(struct sk_buff *skb, struct net_device *dev, 137 netdev_features_t features); 138 139 void fbnic_aggregate_ring_rx_counters(struct fbnic_net *fbn, 140 struct fbnic_ring *rxr); 141 void fbnic_aggregate_ring_tx_counters(struct fbnic_net *fbn, 142 struct fbnic_ring *txr); 143 144 int fbnic_alloc_napi_vectors(struct fbnic_net *fbn); 145 void fbnic_free_napi_vectors(struct fbnic_net *fbn); 146 int fbnic_alloc_resources(struct fbnic_net *fbn); 147 void fbnic_free_resources(struct fbnic_net *fbn); 148 int fbnic_set_netif_queues(struct fbnic_net *fbn); 149 void fbnic_reset_netif_queues(struct fbnic_net *fbn); 150 irqreturn_t fbnic_msix_clean_rings(int irq, void *data); 151 void fbnic_napi_enable(struct fbnic_net *fbn); 152 void fbnic_napi_disable(struct fbnic_net *fbn); 153 void fbnic_enable(struct fbnic_net *fbn); 154 void fbnic_disable(struct fbnic_net *fbn); 155 void fbnic_flush(struct fbnic_net *fbn); 156 void fbnic_fill(struct fbnic_net *fbn); 157 158 void fbnic_napi_depletion_check(struct net_device *netdev); 159 int fbnic_wait_all_queues_idle(struct fbnic_dev *fbd, bool may_fail); 160 161 static inline int fbnic_napi_idx(const struct fbnic_napi_vector *nv) 162 { 163 return nv->v_idx - FBNIC_NON_NAPI_VECTORS; 164 } 165 166 #endif /* _FBNIC_TXRX_H_ */ 167