drivers/net/ethernet/aquantia/atlantic/aq_ring.h

   1 /*
   2  * aQuantia Corporation Network Driver
   3  * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  */
   9
  10 /* File aq_ring.h: Declaration of functions for Rx/Tx rings. */
  11
  12 #ifndef AQ_RING_H
  13 #define AQ_RING_H
  14
  15 #include "aq_common.h"
  16
  17 struct page;
  18 struct aq_nic_cfg_s;
  19
  20 /*           TxC       SOP        DX         EOP
  21  *         +----------+----------+----------+-----------
  22  *   8bytes|len l3,l4 | pa       | pa       | pa
  23  *         +----------+----------+----------+-----------
  24  * 4/8bytes|len pkt   |len pkt   |          | skb
  25  *         +----------+----------+----------+-----------
  26  * 4/8bytes|is_txc    |len,flags |len       |len,is_eop
  27  *         +----------+----------+----------+-----------
  28  *
  29  *  This aq_ring_buff_s doesn't have endianness dependency.
  30  *  It is __packed for cache line optimizations.
  31  */
  32 struct __packed aq_ring_buff_s {
  33         union {
  34                 /* RX */
  35                 struct {
  36                         u32 rss_hash;
  37                         u16 next;
  38                         u8 is_hash_l4;
  39                         u8 rsvd1;
  40                         struct page *page;
  41                 };
  42                 /* EOP */
  43                 struct {
  44                         dma_addr_t pa_eop;
  45                         struct sk_buff *skb;
  46                 };
  47                 /* DX */
  48                 struct {
  49                         dma_addr_t pa;
  50                 };
  51                 /* SOP */
  52                 struct {
  53                         dma_addr_t pa_sop;
  54                         u32 len_pkt_sop;
  55                 };
  56                 /* TxC */
  57                 struct {
  58                         u32 mss;
  59                         u8 len_l2;
  60                         u8 len_l3;
  61                         u8 len_l4;
  62                         u8 is_ipv6:1;
  63                         u8 rsvd2:7;
  64                         u32 len_pkt;
  65                 };
  66         };
  67         union {
  68                 struct {
  69                         u16 len;
  70                         u32 is_ip_cso:1;
  71                         u32 is_udp_cso:1;
  72                         u32 is_tcp_cso:1;
  73                         u32 is_cso_err:1;
  74                         u32 is_sop:1;
  75                         u32 is_eop:1;
  76                         u32 is_txc:1;
  77                         u32 is_mapped:1;
  78                         u32 is_cleaned:1;
  79                         u32 is_error:1;
  80                         u32 rsvd3:6;
  81                         u16 eop_index;
  82                         u16 rsvd4;
  83                 };
  84                 u64 flags;
  85         };
  86 };
  87
  88 struct aq_ring_stats_rx_s {
  89         u64 errors;
  90         u64 packets;
  91         u64 bytes;
  92         u64 lro_packets;
  93         u64 jumbo_packets;
  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         union aq_ring_stats_s stats;
 120         dma_addr_t dx_ring_pa;
 121 };
 122
 123 struct aq_ring_param_s {
 124         unsigned int vec_idx;
 125         unsigned int cpu;
 126         cpumask_t affinity_mask;
 127 };
 128
 129 static inline unsigned int aq_ring_next_dx(struct aq_ring_s *self,
 130                                            unsigned int dx)
 131 {
 132         return (++dx >= self->size) ? 0U : dx;
 133 }
 134
 135 static inline unsigned int aq_ring_avail_dx(struct aq_ring_s *self)
 136 {
 137         return (((self->sw_tail >= self->sw_head)) ?
 138                 (self->size - 1) - self->sw_tail + self->sw_head :
 139                 self->sw_head - self->sw_tail - 1);
 140 }
 141
 142 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
 143                                    struct aq_nic_s *aq_nic,
 144                                    unsigned int idx,
 145                                    struct aq_nic_cfg_s *aq_nic_cfg);
 146 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
 147                                    struct aq_nic_s *aq_nic,
 148                                    unsigned int idx,
 149                                    struct aq_nic_cfg_s *aq_nic_cfg);
 150 int aq_ring_init(struct aq_ring_s *self);
 151 void aq_ring_rx_deinit(struct aq_ring_s *self);
 152 void aq_ring_free(struct aq_ring_s *self);
 153 void aq_ring_update_queue_state(struct aq_ring_s *ring);
 154 void aq_ring_queue_wake(struct aq_ring_s *ring);
 155 void aq_ring_queue_stop(struct aq_ring_s *ring);
 156 bool aq_ring_tx_clean(struct aq_ring_s *self);
 157 int aq_ring_rx_clean(struct aq_ring_s *self,
 158                      struct napi_struct *napi,
 159                      int *work_done,
 160                      int budget);
 161 int aq_ring_rx_fill(struct aq_ring_s *self);
 162
 163 #endif /* AQ_RING_H */