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 /* Number of RX buffers to recycle pages for.  When creating the RX page recycle
22  * ring, this number is divided by the number of buffers per page to calculate
23  * the number of pages to store in the RX page recycle ring.
24  */
25 #define EFX_RECYCLE_RING_SIZE_10G	256
26 
27 static inline u8 *efx_rx_buf_va(struct efx_rx_buffer *buf)
28 {
29 	return page_address(buf->page) + buf->page_offset;
30 }
31 
32 static inline u32 efx_rx_buf_hash(struct efx_nic *efx, const u8 *eh)
33 {
34 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
35 	return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_hash_offset));
36 #else
37 	const u8 *data = eh + efx->rx_packet_hash_offset;
38 
39 	return (u32)data[0]	  |
40 	       (u32)data[1] << 8  |
41 	       (u32)data[2] << 16 |
42 	       (u32)data[3] << 24;
43 #endif
44 }
45 
46 void efx_siena_rx_slow_fill(struct timer_list *t);
47 
48 void efx_siena_recycle_rx_pages(struct efx_channel *channel,
49 				struct efx_rx_buffer *rx_buf,
50 				unsigned int n_frags);
51 void efx_siena_discard_rx_packet(struct efx_channel *channel,
52 				 struct efx_rx_buffer *rx_buf,
53 				 unsigned int n_frags);
54 
55 int efx_siena_probe_rx_queue(struct efx_rx_queue *rx_queue);
56 void efx_siena_init_rx_queue(struct efx_rx_queue *rx_queue);
57 void efx_siena_fini_rx_queue(struct efx_rx_queue *rx_queue);
58 void efx_siena_remove_rx_queue(struct efx_rx_queue *rx_queue);
59 
60 static inline void efx_sync_rx_buffer(struct efx_nic *efx,
61 				      struct efx_rx_buffer *rx_buf,
62 				      unsigned int len)
63 {
64 	dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, len,
65 				DMA_FROM_DEVICE);
66 }
67 
68 void efx_siena_free_rx_buffers(struct efx_rx_queue *rx_queue,
69 			       struct efx_rx_buffer *rx_buf,
70 			       unsigned int num_bufs);
71 
72 void efx_siena_rx_config_page_split(struct efx_nic *efx);
73 void efx_siena_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue,
74 					bool atomic);
75 
76 void
77 efx_siena_rx_packet_gro(struct efx_channel *channel,
78 			struct efx_rx_buffer *rx_buf,
79 			unsigned int n_frags, u8 *eh, __wsum csum);
80 
81 struct efx_rss_context *efx_siena_alloc_rss_context_entry(struct efx_nic *efx);
82 struct efx_rss_context *efx_siena_find_rss_context_entry(struct efx_nic *efx,
83 							 u32 id);
84 void efx_siena_free_rss_context_entry(struct efx_rss_context *ctx);
85 void efx_siena_set_default_rx_indir_table(struct efx_nic *efx,
86 					  struct efx_rss_context *ctx);
87 
88 bool efx_siena_filter_is_mc_recipient(const struct efx_filter_spec *spec);
89 bool efx_siena_filter_spec_equal(const struct efx_filter_spec *left,
90 				 const struct efx_filter_spec *right);
91 u32 efx_siena_filter_spec_hash(const struct efx_filter_spec *spec);
92 
93 #ifdef CONFIG_RFS_ACCEL
94 bool efx_siena_rps_check_rule(struct efx_arfs_rule *rule,
95 			      unsigned int filter_idx, bool *force);
96 struct efx_arfs_rule *efx_siena_rps_hash_find(struct efx_nic *efx,
97 					const struct efx_filter_spec *spec);
98 void efx_siena_rps_hash_del(struct efx_nic *efx,
99 			    const struct efx_filter_spec *spec);
100 
101 int efx_siena_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
102 			 u16 rxq_index, u32 flow_id);
103 bool __efx_siena_filter_rfs_expire(struct efx_channel *channel,
104 				   unsigned int quota);
105 #endif
106 
107 int efx_siena_probe_filters(struct efx_nic *efx);
108 void efx_siena_remove_filters(struct efx_nic *efx);
109 
110 #endif
111