1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * aQuantia Corporation Network Driver
4 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
7 /* File aq_ring.h: Declaration of functions for Rx/Tx rings. */
12 #include "aq_common.h"
25 * +----------+----------+----------+-----------
26 * 8bytes|len l3,l4 | pa | pa | pa
27 * +----------+----------+----------+-----------
28 * 4/8bytes|len pkt |len pkt | | skb
29 * +----------+----------+----------+-----------
30 * 4/8bytes|is_gso |len,flags |len |len,is_eop
31 * +----------+----------+----------+-----------
33 * This aq_ring_buff_s doesn't have endianness dependency.
34 * It is __packed for cache line optimizations.
36 struct __packed aq_ring_buff_s {
46 struct aq_rxpage rxdata;
88 struct aq_ring_stats_rx_s {
99 struct aq_ring_stats_tx_s {
106 union aq_ring_stats_s {
107 struct aq_ring_stats_rx_s rx;
108 struct aq_ring_stats_tx_s tx;
112 struct aq_ring_buff_s *buff_ring;
113 u8 *dx_ring; /* descriptors ring, dma shared mem */
114 struct aq_nic_s *aq_nic;
115 unsigned int idx; /* for HW layer registers operations */
116 unsigned int hw_head;
117 unsigned int sw_head;
118 unsigned int sw_tail;
119 unsigned int size; /* descriptors number */
120 unsigned int dx_size; /* TX or RX descriptor size, */
121 /* stored here for fater math */
122 unsigned int page_order;
123 union aq_ring_stats_s stats;
124 dma_addr_t dx_ring_pa;
127 struct aq_ring_param_s {
128 unsigned int vec_idx;
130 cpumask_t affinity_mask;
133 static inline void *aq_buf_vaddr(struct aq_rxpage *rxpage)
135 return page_to_virt(rxpage->page) + rxpage->pg_off;
138 static inline dma_addr_t aq_buf_daddr(struct aq_rxpage *rxpage)
140 return rxpage->daddr + rxpage->pg_off;
143 static inline unsigned int aq_ring_next_dx(struct aq_ring_s *self,
146 return (++dx >= self->size) ? 0U : dx;
149 static inline unsigned int aq_ring_avail_dx(struct aq_ring_s *self)
151 return (((self->sw_tail >= self->sw_head)) ?
152 (self->size - 1) - self->sw_tail + self->sw_head :
153 self->sw_head - self->sw_tail - 1);
156 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
157 struct aq_nic_s *aq_nic,
159 struct aq_nic_cfg_s *aq_nic_cfg);
160 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
161 struct aq_nic_s *aq_nic,
163 struct aq_nic_cfg_s *aq_nic_cfg);
164 int aq_ring_init(struct aq_ring_s *self);
165 void aq_ring_rx_deinit(struct aq_ring_s *self);
166 void aq_ring_free(struct aq_ring_s *self);
167 void aq_ring_update_queue_state(struct aq_ring_s *ring);
168 void aq_ring_queue_wake(struct aq_ring_s *ring);
169 void aq_ring_queue_stop(struct aq_ring_s *ring);
170 bool aq_ring_tx_clean(struct aq_ring_s *self);
171 int aq_ring_rx_clean(struct aq_ring_s *self,
172 struct napi_struct *napi,
175 int aq_ring_rx_fill(struct aq_ring_s *self);
177 #endif /* AQ_RING_H */