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 /* To receive the worst case packet we need: 28 * 1 descriptor for primary metadata 29 * + 1 descriptor for optional metadata 30 * + 1 descriptor for headers 31 * + 4 descriptors for payload 32 */ 33 #define FBNIC_MAX_RX_PKT_DESC 7 34 #define FBNIC_RX_DESC_MIN roundup_pow_of_two(FBNIC_MAX_RX_PKT_DESC * 2) 35 36 #define FBNIC_MAX_TXQS 128u 37 #define FBNIC_MAX_RXQS 128u 38 39 /* These apply to TWQs, TCQ, RCQ */ 40 #define FBNIC_QUEUE_SIZE_MIN 16u 41 #define FBNIC_QUEUE_SIZE_MAX SZ_64K 42 43 #define FBNIC_TXQ_SIZE_DEFAULT 1024 44 #define FBNIC_HPQ_SIZE_DEFAULT 256 45 #define FBNIC_PPQ_SIZE_DEFAULT 256 46 #define FBNIC_RCQ_SIZE_DEFAULT 1024 47 #define FBNIC_TX_USECS_DEFAULT 35 48 #define FBNIC_RX_USECS_DEFAULT 30 49 #define FBNIC_RX_FRAMES_DEFAULT 0 50 51 #define FBNIC_RX_TROOM \ 52 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) 53 #define FBNIC_RX_HROOM \ 54 (ALIGN(FBNIC_RX_TROOM + NET_SKB_PAD, 128) - FBNIC_RX_TROOM) 55 #define FBNIC_RX_PAD 0 56 #define FBNIC_RX_MAX_HDR (1536 - FBNIC_RX_PAD) 57 #define FBNIC_RX_PAYLD_OFFSET 0 58 #define FBNIC_RX_PAYLD_PG_CL 0 59 60 #define FBNIC_RING_F_DISABLED BIT(0) 61 #define FBNIC_RING_F_CTX BIT(1) 62 #define FBNIC_RING_F_STATS BIT(2) /* Ring's stats may be used */ 63 64 struct fbnic_pkt_buff { 65 struct xdp_buff buff; 66 ktime_t hwtstamp; 67 u32 data_truesize; 68 u16 data_len; 69 u16 nr_frags; 70 }; 71 72 struct fbnic_queue_stats { 73 u64 packets; 74 u64 bytes; 75 union { 76 struct { 77 u64 csum_partial; 78 u64 lso; 79 u64 ts_packets; 80 u64 ts_lost; 81 u64 stop; 82 u64 wake; 83 } twq; 84 struct { 85 u64 alloc_failed; 86 u64 csum_complete; 87 u64 csum_none; 88 } rx; 89 }; 90 u64 dropped; 91 struct u64_stats_sync syncp; 92 }; 93 94 /* Pagecnt bias is long max to reserve the last bit to catch overflow 95 * cases where if we overcharge the bias it will flip over to be negative. 96 */ 97 #define PAGECNT_BIAS_MAX LONG_MAX 98 struct fbnic_rx_buf { 99 struct page *page; 100 long pagecnt_bias; 101 }; 102 103 struct fbnic_ring { 104 /* Pointer to buffer specific info */ 105 union { 106 struct fbnic_pkt_buff *pkt; /* RCQ */ 107 struct fbnic_rx_buf *rx_buf; /* BDQ */ 108 void **tx_buf; /* TWQ */ 109 void *buffer; /* Generic pointer */ 110 }; 111 112 u32 __iomem *doorbell; /* Pointer to CSR space for ring */ 113 __le64 *desc; /* Descriptor ring memory */ 114 u16 size_mask; /* Size of ring in descriptors - 1 */ 115 u8 q_idx; /* Logical netdev ring index */ 116 u8 flags; /* Ring flags (FBNIC_RING_F_*) */ 117 118 u32 head, tail; /* Head/Tail of ring */ 119 120 struct fbnic_queue_stats stats; 121 122 /* Slow path fields follow */ 123 dma_addr_t dma; /* Phys addr of descriptor memory */ 124 size_t size; /* Size of descriptor ring in memory */ 125 }; 126 127 struct fbnic_q_triad { 128 struct fbnic_ring sub0, sub1, cmpl; 129 }; 130 131 struct fbnic_napi_vector { 132 struct napi_struct napi; 133 struct device *dev; /* Device for DMA unmapping */ 134 struct page_pool *page_pool; 135 struct fbnic_dev *fbd; 136 137 u16 v_idx; 138 u8 txt_count; 139 u8 rxt_count; 140 141 struct fbnic_q_triad qt[]; 142 }; 143 144 netdev_tx_t fbnic_xmit_frame(struct sk_buff *skb, struct net_device *dev); 145 netdev_features_t 146 fbnic_features_check(struct sk_buff *skb, struct net_device *dev, 147 netdev_features_t features); 148 149 void fbnic_aggregate_ring_rx_counters(struct fbnic_net *fbn, 150 struct fbnic_ring *rxr); 151 void fbnic_aggregate_ring_tx_counters(struct fbnic_net *fbn, 152 struct fbnic_ring *txr); 153 154 int fbnic_alloc_napi_vectors(struct fbnic_net *fbn); 155 void fbnic_free_napi_vectors(struct fbnic_net *fbn); 156 int fbnic_alloc_resources(struct fbnic_net *fbn); 157 void fbnic_free_resources(struct fbnic_net *fbn); 158 int fbnic_set_netif_queues(struct fbnic_net *fbn); 159 void fbnic_reset_netif_queues(struct fbnic_net *fbn); 160 irqreturn_t fbnic_msix_clean_rings(int irq, void *data); 161 void fbnic_napi_enable(struct fbnic_net *fbn); 162 void fbnic_napi_disable(struct fbnic_net *fbn); 163 void fbnic_enable(struct fbnic_net *fbn); 164 void fbnic_disable(struct fbnic_net *fbn); 165 void fbnic_flush(struct fbnic_net *fbn); 166 void fbnic_fill(struct fbnic_net *fbn); 167 168 void fbnic_napi_depletion_check(struct net_device *netdev); 169 int fbnic_wait_all_queues_idle(struct fbnic_dev *fbd, bool may_fail); 170 171 static inline int fbnic_napi_idx(const struct fbnic_napi_vector *nv) 172 { 173 return nv->v_idx - FBNIC_NON_NAPI_VECTORS; 174 } 175 176 #endif /* _FBNIC_TXRX_H_ */ 177