1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /****************************************************************************
3  * Driver for Solarflare network controllers and boards
4  * Copyright 2018 Solarflare Communications Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published
8  * by the Free Software Foundation, incorporated herein by reference.
9  */
10 
11 #ifndef EFX_RX_COMMON_H
12 #define EFX_RX_COMMON_H
13 
14 /* Preferred number of descriptors to fill at once */
15 #define EFX_RX_PREFERRED_BATCH 8U
16 
17 /* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */
18 #define EFX_RX_MAX_FRAGS DIV_ROUND_UP(EFX_MAX_FRAME_LEN(EFX_MAX_MTU), \
19 				      EFX_RX_USR_BUF_SIZE)
20 
21 static inline u8 *efx_rx_buf_va(struct efx_rx_buffer *buf)
22 {
23 	return page_address(buf->page) + buf->page_offset;
24 }
25 
26 static inline u32 efx_rx_buf_hash(struct efx_nic *efx, const u8 *eh)
27 {
28 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
29 	return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_hash_offset));
30 #else
31 	const u8 *data = eh + efx->rx_packet_hash_offset;
32 
33 	return (u32)data[0]	  |
34 	       (u32)data[1] << 8  |
35 	       (u32)data[2] << 16 |
36 	       (u32)data[3] << 24;
37 #endif
38 }
39 
40 void efx_rx_slow_fill(struct timer_list *t);
41 
42 void efx_recycle_rx_pages(struct efx_channel *channel,
43 			  struct efx_rx_buffer *rx_buf,
44 			  unsigned int n_frags);
45 void efx_discard_rx_packet(struct efx_channel *channel,
46 			   struct efx_rx_buffer *rx_buf,
47 			   unsigned int n_frags);
48 
49 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
50 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
51 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
52 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
53 void efx_destroy_rx_queue(struct efx_rx_queue *rx_queue);
54 
55 void efx_init_rx_buffer(struct efx_rx_queue *rx_queue,
56 			struct page *page,
57 			unsigned int page_offset,
58 			u16 flags);
59 void efx_unmap_rx_buffer(struct efx_nic *efx, struct efx_rx_buffer *rx_buf);
60 
61 static inline void efx_sync_rx_buffer(struct efx_nic *efx,
62 				      struct efx_rx_buffer *rx_buf,
63 				      unsigned int len)
64 {
65 	dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, len,
66 				DMA_FROM_DEVICE);
67 }
68 
69 void efx_free_rx_buffers(struct efx_rx_queue *rx_queue,
70 			 struct efx_rx_buffer *rx_buf,
71 			 unsigned int num_bufs);
72 
73 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
74 void efx_rx_config_page_split(struct efx_nic *efx);
75 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
76 
77 void
78 efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf,
79 		  unsigned int n_frags, u8 *eh, __wsum csum);
80 
81 struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx);
82 struct efx_rss_context *efx_find_rss_context_entry(struct efx_nic *efx, u32 id);
83 void efx_free_rss_context_entry(struct efx_rss_context *ctx);
84 void efx_set_default_rx_indir_table(struct efx_nic *efx,
85 				    struct efx_rss_context *ctx);
86 
87 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
88 bool efx_filter_spec_equal(const struct efx_filter_spec *left,
89 			   const struct efx_filter_spec *right);
90 u32 efx_filter_spec_hash(const struct efx_filter_spec *spec);
91 
92 #ifdef CONFIG_RFS_ACCEL
93 bool efx_rps_check_rule(struct efx_arfs_rule *rule, unsigned int filter_idx,
94 			bool *force);
95 struct efx_arfs_rule *efx_rps_hash_find(struct efx_nic *efx,
96 					const struct efx_filter_spec *spec);
97 struct efx_arfs_rule *efx_rps_hash_add(struct efx_nic *efx,
98 				       const struct efx_filter_spec *spec,
99 				       bool *new);
100 void efx_rps_hash_del(struct efx_nic *efx, const struct efx_filter_spec *spec);
101 
102 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
103 		   u16 rxq_index, u32 flow_id);
104 bool __efx_filter_rfs_expire(struct efx_channel *channel, unsigned int quota);
105 #endif
106 
107 int efx_probe_filters(struct efx_nic *efx);
108 void efx_remove_filters(struct efx_nic *efx);
109 
110 #endif
111