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)	((1UL << 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 
34 bool ef100_rx_buf_hash_valid(const u8 *prefix)
35 {
36 	return PREFIX_FIELD(prefix, RSS_HASH_VALID);
37 }
38 
39 static 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 
56 void __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 (ef100_has_fcs_error(channel, prefix) &&
71 	    unlikely(!(efx->net_dev->features & NETIF_F_RXALL)))
72 		goto out;
73 
74 	rx_buf->len = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, LENGTH));
75 	if (rx_buf->len <= sizeof(struct ethhdr)) {
76 		if (net_ratelimit())
77 			netif_err(channel->efx, rx_err, channel->efx->net_dev,
78 				  "RX packet too small (%d)\n", rx_buf->len);
79 		++channel->n_rx_frm_trunc;
80 		goto out;
81 	}
82 
83 	ing_port = le16_to_cpu((__force __le16) PREFIX_FIELD(prefix, INGRESS_MPORT));
84 
85 	nic_data = efx->nic_data;
86 
87 	if (nic_data->have_mport && ing_port != nic_data->base_mport) {
88 #ifdef CONFIG_SFC_SRIOV
89 		struct efx_rep *efv;
90 
91 		rcu_read_lock();
92 		efv = efx_ef100_find_rep_by_mport(efx, ing_port);
93 		if (efv) {
94 			if (efv->net_dev->flags & IFF_UP)
95 				efx_ef100_rep_rx_packet(efv, rx_buf);
96 			rcu_read_unlock();
97 			/* Representor Rx doesn't care about PF Rx buffer
98 			 * ownership, it just makes a copy. So, we are done
99 			 * with the Rx buffer from PF point of view and should
100 			 * free it.
101 			 */
102 			goto free_rx_buffer;
103 		}
104 		rcu_read_unlock();
105 #endif
106 		if (net_ratelimit())
107 			netif_warn(efx, drv, efx->net_dev,
108 				   "Unrecognised ing_port %04x (base %04x), dropping\n",
109 				   ing_port, nic_data->base_mport);
110 		channel->n_rx_mport_bad++;
111 		goto free_rx_buffer;
112 	}
113 
114 	if (likely(efx->net_dev->features & NETIF_F_RXCSUM)) {
115 		if (PREFIX_FIELD(prefix, NT_OR_INNER_L3_CLASS) == 1) {
116 			++channel->n_rx_ip_hdr_chksum_err;
117 		} else {
118 			u16 sum = be16_to_cpu((__force __be16)PREFIX_FIELD(prefix, CSUM_FRAME));
119 
120 			csum = (__force __wsum) sum;
121 		}
122 	}
123 
124 	if (channel->type->receive_skb) {
125 		/* no support for special channels yet, so just discard */
126 		WARN_ON_ONCE(1);
127 		goto free_rx_buffer;
128 	}
129 
130 	efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
131 	goto out;
132 
133 free_rx_buffer:
134 	efx_free_rx_buffers(rx_queue, rx_buf, 1);
135 out:
136 	channel->rx_pkt_n_frags = 0;
137 }
138 
139 static void ef100_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index)
140 {
141 	struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue, index);
142 	struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
143 	struct efx_nic *efx = rx_queue->efx;
144 
145 	++rx_queue->rx_packets;
146 
147 	netif_vdbg(efx, rx_status, efx->net_dev,
148 		   "RX queue %d received id %x\n",
149 		   efx_rx_queue_index(rx_queue), index);
150 
151 	efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
152 
153 	prefetch(efx_rx_buf_va(rx_buf));
154 
155 	rx_buf->page_offset += efx->rx_prefix_size;
156 
157 	efx_recycle_rx_pages(channel, rx_buf, 1);
158 
159 	efx_rx_flush_packet(channel);
160 	channel->rx_pkt_n_frags = 1;
161 	channel->rx_pkt_index = index;
162 }
163 
164 void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event)
165 {
166 	struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
167 	unsigned int n_packets =
168 		EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_RXPKTS_NUM_PKT);
169 	int i;
170 
171 	WARN_ON_ONCE(!n_packets);
172 	if (n_packets > 1)
173 		++channel->n_rx_merge_events;
174 
175 	channel->irq_mod_score += 2 * n_packets;
176 
177 	for (i = 0; i < n_packets; ++i) {
178 		ef100_rx_packet(rx_queue,
179 				rx_queue->removed_count & rx_queue->ptr_mask);
180 		++rx_queue->removed_count;
181 	}
182 }
183 
184 void ef100_rx_write(struct efx_rx_queue *rx_queue)
185 {
186 	struct efx_rx_buffer *rx_buf;
187 	unsigned int idx;
188 	efx_qword_t *rxd;
189 	efx_dword_t rxdb;
190 
191 	while (rx_queue->notified_count != rx_queue->added_count) {
192 		idx = rx_queue->notified_count & rx_queue->ptr_mask;
193 		rx_buf = efx_rx_buffer(rx_queue, idx);
194 		rxd = efx_rx_desc(rx_queue, idx);
195 
196 		EFX_POPULATE_QWORD_1(*rxd, ESF_GZ_RX_BUF_ADDR, rx_buf->dma_addr);
197 
198 		++rx_queue->notified_count;
199 	}
200 
201 	wmb();
202 	EFX_POPULATE_DWORD_1(rxdb, ERF_GZ_RX_RING_PIDX,
203 			     rx_queue->added_count & rx_queue->ptr_mask);
204 	efx_writed_page(rx_queue->efx, &rxdb,
205 			ER_GZ_RX_RING_DOORBELL, efx_rx_queue_index(rx_queue));
206 }
207