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1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2019 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#include "net_driver.h"
12#include "ef100_rx.h"
13#include "rx_common.h"
14#include "efx.h"
15#include "nic_common.h"
16#include "mcdi_functions.h"
17#include "ef100_regs.h"
18#include "ef100_nic.h"
19#include "io.h"
20
21/* Get the value of a field in the RX prefix */
22#define PREFIX_OFFSET_W(_f) (ESF_GZ_RX_PREFIX_ ## _f ## _LBN / 32)
23#define PREFIX_OFFSET_B(_f) (ESF_GZ_RX_PREFIX_ ## _f ## _LBN % 32)
24#define PREFIX_WIDTH_MASK(_f) ((1ULL << ESF_GZ_RX_PREFIX_ ## _f ## _WIDTH) - 1)
25#define PREFIX_WORD(_p, _f) le32_to_cpu((__force __le32)(_p)[PREFIX_OFFSET_W(_f)])
26#define PREFIX_FIELD(_p, _f) ((PREFIX_WORD(_p, _f) >> PREFIX_OFFSET_B(_f)) & \
27 PREFIX_WIDTH_MASK(_f))
28
29#define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_LBN \
30 (ESF_GZ_RX_PREFIX_CLASS_LBN + ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_LBN)
31#define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_WIDTH \
32 ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_WIDTH
33
34bool ef100_rx_buf_hash_valid(const u8 *prefix)
35{
36 return PREFIX_FIELD(prefix, RSS_HASH_VALID);
37}
38
39static bool ef100_has_fcs_error(struct efx_channel *channel, u32 *prefix)
40{
41 u16 rxclass;
42 u8 l2status;
43
44 rxclass = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, CLASS));
45 l2status = PREFIX_FIELD(&rxclass, HCLASS_L2_STATUS);
46
47 if (likely(l2status == ESE_GZ_RH_HCLASS_L2_STATUS_OK))
48 /* Everything is ok */
49 return false;
50
51 if (l2status == ESE_GZ_RH_HCLASS_L2_STATUS_FCS_ERR)
52 channel->n_rx_eth_crc_err++;
53 return true;
54}
55
56void __ef100_rx_packet(struct efx_channel *channel)
57{
58 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
59 struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue,
60 channel->rx_pkt_index);
61 struct efx_nic *efx = channel->efx;
62 struct ef100_nic_data *nic_data;
63 u8 *eh = efx_rx_buf_va(rx_buf);
64 __wsum csum = 0;
65 u16 ing_port;
66 u32 *prefix;
67
68 prefix = (u32 *)(eh - ESE_GZ_RX_PKT_PREFIX_LEN);
69
70 if (channel->type->receive_raw) {
71 u32 mark = PREFIX_FIELD(prefix, USER_MARK);
72
73 if (channel->type->receive_raw(rx_queue, mark))
74 return; /* packet was consumed */
75 }
76
77 if (ef100_has_fcs_error(channel, prefix) &&
78 unlikely(!(efx->net_dev->features & NETIF_F_RXALL)))
79 goto out;
80
81 rx_buf->len = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, LENGTH));
82 if (rx_buf->len <= sizeof(struct ethhdr)) {
83 if (net_ratelimit())
84 netif_err(channel->efx, rx_err, channel->efx->net_dev,
85 "RX packet too small (%d)\n", rx_buf->len);
86 ++channel->n_rx_frm_trunc;
87 goto out;
88 }
89
90 ing_port = le16_to_cpu((__force __le16) PREFIX_FIELD(prefix, INGRESS_MPORT));
91
92 nic_data = efx->nic_data;
93
94 if (nic_data->have_mport && ing_port != nic_data->base_mport) {
95#ifdef CONFIG_SFC_SRIOV
96 struct efx_rep *efv;
97
98 rcu_read_lock();
99 efv = efx_ef100_find_rep_by_mport(efx, ing_port);
100 if (efv) {
101 if (efv->net_dev->flags & IFF_UP)
102 efx_ef100_rep_rx_packet(efv, rx_buf);
103 rcu_read_unlock();
104 /* Representor Rx doesn't care about PF Rx buffer
105 * ownership, it just makes a copy. So, we are done
106 * with the Rx buffer from PF point of view and should
107 * free it.
108 */
109 goto free_rx_buffer;
110 }
111 rcu_read_unlock();
112#endif
113 if (net_ratelimit())
114 netif_warn(efx, drv, efx->net_dev,
115 "Unrecognised ing_port %04x (base %04x), dropping\n",
116 ing_port, nic_data->base_mport);
117 channel->n_rx_mport_bad++;
118 goto free_rx_buffer;
119 }
120
121 if (likely(efx->net_dev->features & NETIF_F_RXCSUM)) {
122 if (PREFIX_FIELD(prefix, NT_OR_INNER_L3_CLASS) == 1) {
123 ++channel->n_rx_ip_hdr_chksum_err;
124 } else {
125 u16 sum = be16_to_cpu((__force __be16)PREFIX_FIELD(prefix, CSUM_FRAME));
126
127 csum = (__force __wsum) sum;
128 }
129 }
130
131 if (channel->type->receive_skb) {
132 /* no support for special channels yet, so just discard */
133 WARN_ON_ONCE(1);
134 goto free_rx_buffer;
135 }
136
137 efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
138 goto out;
139
140free_rx_buffer:
141 efx_free_rx_buffers(rx_queue, rx_buf, 1);
142out:
143 channel->rx_pkt_n_frags = 0;
144}
145
146static void ef100_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index)
147{
148 struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue, index);
149 struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
150 struct efx_nic *efx = rx_queue->efx;
151
152 ++rx_queue->rx_packets;
153
154 netif_vdbg(efx, rx_status, efx->net_dev,
155 "RX queue %d received id %x\n",
156 efx_rx_queue_index(rx_queue), index);
157
158 efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
159
160 prefetch(efx_rx_buf_va(rx_buf));
161
162 rx_buf->page_offset += efx->rx_prefix_size;
163
164 efx_recycle_rx_pages(channel, rx_buf, 1);
165
166 efx_rx_flush_packet(channel);
167 channel->rx_pkt_n_frags = 1;
168 channel->rx_pkt_index = index;
169}
170
171void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event)
172{
173 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
174 unsigned int n_packets =
175 EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_RXPKTS_NUM_PKT);
176 int i;
177
178 WARN_ON_ONCE(!n_packets);
179 if (n_packets > 1)
180 ++channel->n_rx_merge_events;
181
182 channel->irq_mod_score += 2 * n_packets;
183
184 for (i = 0; i < n_packets; ++i) {
185 ef100_rx_packet(rx_queue,
186 rx_queue->removed_count & rx_queue->ptr_mask);
187 ++rx_queue->removed_count;
188 }
189}
190
191void ef100_rx_write(struct efx_rx_queue *rx_queue)
192{
193 unsigned int notified_count = rx_queue->notified_count;
194 struct efx_rx_buffer *rx_buf;
195 unsigned int idx;
196 efx_qword_t *rxd;
197 efx_dword_t rxdb;
198
199 while (notified_count != rx_queue->added_count) {
200 idx = notified_count & rx_queue->ptr_mask;
201 rx_buf = efx_rx_buffer(rx_queue, idx);
202 rxd = efx_rx_desc(rx_queue, idx);
203
204 EFX_POPULATE_QWORD_1(*rxd, ESF_GZ_RX_BUF_ADDR, rx_buf->dma_addr);
205
206 ++notified_count;
207 }
208 if (notified_count == rx_queue->notified_count)
209 return;
210
211 wmb();
212 EFX_POPULATE_DWORD_1(rxdb, ERF_GZ_RX_RING_PIDX,
213 rx_queue->added_count & rx_queue->ptr_mask);
214 efx_writed_page(rx_queue->efx, &rxdb,
215 ER_GZ_RX_RING_DOORBELL, efx_rx_queue_index(rx_queue));
216 if (rx_queue->grant_credits)
217 wmb();
218 rx_queue->notified_count = notified_count;
219 if (rx_queue->grant_credits)
220 schedule_work(&rx_queue->grant_work);
221}