1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * aQuantia Corporation Network Driver 4 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved 5 */ 6 7 /* File aq_ring.h: Declaration of functions for Rx/Tx rings. */ 8 9 #ifndef AQ_RING_H 10 #define AQ_RING_H 11 12 #include "aq_common.h" 13 14 struct page; 15 struct aq_nic_cfg_s; 16 17 struct aq_rxpage { 18 struct page *page; 19 dma_addr_t daddr; 20 unsigned int order; 21 unsigned int pg_off; 22 }; 23 24 /* TxC SOP DX EOP 25 * +----------+----------+----------+----------- 26 * 8bytes|len l3,l4 | pa | pa | pa 27 * +----------+----------+----------+----------- 28 * 4/8bytes|len pkt |len pkt | | skb 29 * +----------+----------+----------+----------- 30 * 4/8bytes|is_txc |len,flags |len |len,is_eop 31 * +----------+----------+----------+----------- 32 * 33 * This aq_ring_buff_s doesn't have endianness dependency. 34 * It is __packed for cache line optimizations. 35 */ 36 struct __packed aq_ring_buff_s { 37 union { 38 /* RX/TX */ 39 dma_addr_t pa; 40 /* RX */ 41 struct { 42 u32 rss_hash; 43 u16 next; 44 u8 is_hash_l4; 45 u8 rsvd1; 46 struct aq_rxpage rxdata; 47 }; 48 /* EOP */ 49 struct { 50 dma_addr_t pa_eop; 51 struct sk_buff *skb; 52 }; 53 /* TxC */ 54 struct { 55 u32 mss; 56 u8 len_l2; 57 u8 len_l3; 58 u8 len_l4; 59 u8 is_ipv6:1; 60 u8 rsvd2:7; 61 u32 len_pkt; 62 }; 63 }; 64 union { 65 struct { 66 u16 len; 67 u32 is_ip_cso:1; 68 u32 is_udp_cso:1; 69 u32 is_tcp_cso:1; 70 u32 is_cso_err:1; 71 u32 is_sop:1; 72 u32 is_eop:1; 73 u32 is_txc:1; 74 u32 is_mapped:1; 75 u32 is_cleaned:1; 76 u32 is_error:1; 77 u32 rsvd3:6; 78 u16 eop_index; 79 u16 rsvd4; 80 }; 81 u64 flags; 82 }; 83 }; 84 85 struct aq_ring_stats_rx_s { 86 u64 errors; 87 u64 packets; 88 u64 bytes; 89 u64 lro_packets; 90 u64 jumbo_packets; 91 u64 pg_losts; 92 u64 pg_flips; 93 u64 pg_reuses; 94 }; 95 96 struct aq_ring_stats_tx_s { 97 u64 errors; 98 u64 packets; 99 u64 bytes; 100 u64 queue_restarts; 101 }; 102 103 union aq_ring_stats_s { 104 struct aq_ring_stats_rx_s rx; 105 struct aq_ring_stats_tx_s tx; 106 }; 107 108 struct aq_ring_s { 109 struct aq_ring_buff_s *buff_ring; 110 u8 *dx_ring; /* descriptors ring, dma shared mem */ 111 struct aq_nic_s *aq_nic; 112 unsigned int idx; /* for HW layer registers operations */ 113 unsigned int hw_head; 114 unsigned int sw_head; 115 unsigned int sw_tail; 116 unsigned int size; /* descriptors number */ 117 unsigned int dx_size; /* TX or RX descriptor size, */ 118 /* stored here for fater math */ 119 unsigned int page_order; 120 union aq_ring_stats_s stats; 121 dma_addr_t dx_ring_pa; 122 }; 123 124 struct aq_ring_param_s { 125 unsigned int vec_idx; 126 unsigned int cpu; 127 cpumask_t affinity_mask; 128 }; 129 130 static inline void *aq_buf_vaddr(struct aq_rxpage *rxpage) 131 { 132 return page_to_virt(rxpage->page) + rxpage->pg_off; 133 } 134 135 static inline dma_addr_t aq_buf_daddr(struct aq_rxpage *rxpage) 136 { 137 return rxpage->daddr + rxpage->pg_off; 138 } 139 140 static inline unsigned int aq_ring_next_dx(struct aq_ring_s *self, 141 unsigned int dx) 142 { 143 return (++dx >= self->size) ? 0U : dx; 144 } 145 146 static inline unsigned int aq_ring_avail_dx(struct aq_ring_s *self) 147 { 148 return (((self->sw_tail >= self->sw_head)) ? 149 (self->size - 1) - self->sw_tail + self->sw_head : 150 self->sw_head - self->sw_tail - 1); 151 } 152 153 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self, 154 struct aq_nic_s *aq_nic, 155 unsigned int idx, 156 struct aq_nic_cfg_s *aq_nic_cfg); 157 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self, 158 struct aq_nic_s *aq_nic, 159 unsigned int idx, 160 struct aq_nic_cfg_s *aq_nic_cfg); 161 int aq_ring_init(struct aq_ring_s *self); 162 void aq_ring_rx_deinit(struct aq_ring_s *self); 163 void aq_ring_free(struct aq_ring_s *self); 164 void aq_ring_update_queue_state(struct aq_ring_s *ring); 165 void aq_ring_queue_wake(struct aq_ring_s *ring); 166 void aq_ring_queue_stop(struct aq_ring_s *ring); 167 bool aq_ring_tx_clean(struct aq_ring_s *self); 168 int aq_ring_rx_clean(struct aq_ring_s *self, 169 struct napi_struct *napi, 170 int *work_done, 171 int budget); 172 int aq_ring_rx_fill(struct aq_ring_s *self); 173 174 #endif /* AQ_RING_H */ 175