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1 From 0254efd8d7e8f533b57bdf8665991fd5548c65a8 Mon Sep 17 00:00:00 2001
2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
3 Date: Thu, 14 Nov 2019 17:03:29 +0200
4 Subject: [PATCH] net: dsa: ocelot: add tagger for Ocelot/Felix switches
5
6 While it is entirely possible that this tagger format is in fact more
7 generic than just these 2 switch families, I don't have that knowledge.
8 The Seville switch in NXP T1040 has a similar frame format, but there
9 are enough differences (e.g. DEST field starts at bit 57 instead of 56)
10 that calling this file tag_vitesse.c is a bit of a stretch at the
11 moment. The frame format has been listed in a comment so that people who
12 add support for further Vitesse switches can rework this tagger while
13 keeping compatibility with Felix.
14
15 The "ocelot" name was chosen instead of "felix" because even the Ocelot
16 switch can act as a DSA device when it is used in NPI mode, and the Felix
17 tagger format is almost identical. Currently it is only used for the
18 Felix switch embedded in the NXP LS1028A chip.
19
20 The ABI for this tagger should be considered "not stable" at the moment.
21 The DSA tag is always placed before the Ethernet header and therefore,
22 we are using the long prefix for RX tags to avoid putting the DSA master
23 port in promiscuous mode. Once there will be an API in DSA for drivers
24 to request DSA masters to be in promiscuous mode unconditionally, we
25 will switch to the "no prefix" extraction frame header, which will save
26 16 padding bytes for each RX frame.
27
28 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
29 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
30 Signed-off-by: David S. Miller <davem@davemloft.net>
31 ---
32  MAINTAINERS          |   7 ++
33  include/net/dsa.h    |   2 +
34  net/dsa/Kconfig      |   7 ++
35  net/dsa/Makefile     |   1 +
36  net/dsa/tag_ocelot.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++++++
37  5 files changed, 246 insertions(+)
38  create mode 100644 net/dsa/tag_ocelot.c
39
40 --- a/MAINTAINERS
41 +++ b/MAINTAINERS
42 @@ -17354,6 +17354,13 @@ S:     Maintained
43  F:     drivers/input/serio/userio.c
44  F:     include/uapi/linux/userio.h
45  
46 +VITESSE FELIX ETHERNET SWITCH DRIVER
47 +M:     Vladimir Oltean <vladimir.oltean@nxp.com>
48 +M:     Claudiu Manoil <claudiu.manoil@nxp.com>
49 +L:     netdev@vger.kernel.org
50 +S:     Maintained
51 +F:     net/dsa/tag_ocelot.c
52 +
53  VIVID VIRTUAL VIDEO DRIVER
54  M:     Hans Verkuil <hverkuil@xs4all.nl>
55  L:     linux-media@vger.kernel.org
56 --- a/include/net/dsa.h
57 +++ b/include/net/dsa.h
58 @@ -42,6 +42,7 @@ struct phylink_link_state;
59  #define DSA_TAG_PROTO_8021Q_VALUE              12
60  #define DSA_TAG_PROTO_SJA1105_VALUE            13
61  #define DSA_TAG_PROTO_KSZ8795_VALUE            14
62 +#define DSA_TAG_PROTO_OCELOT_VALUE             15
63  
64  enum dsa_tag_protocol {
65         DSA_TAG_PROTO_NONE              = DSA_TAG_PROTO_NONE_VALUE,
66 @@ -59,6 +60,7 @@ enum dsa_tag_protocol {
67         DSA_TAG_PROTO_8021Q             = DSA_TAG_PROTO_8021Q_VALUE,
68         DSA_TAG_PROTO_SJA1105           = DSA_TAG_PROTO_SJA1105_VALUE,
69         DSA_TAG_PROTO_KSZ8795           = DSA_TAG_PROTO_KSZ8795_VALUE,
70 +       DSA_TAG_PROTO_OCELOT            = DSA_TAG_PROTO_OCELOT_VALUE,
71  };
72  
73  struct packet_type;
74 --- a/net/dsa/Kconfig
75 +++ b/net/dsa/Kconfig
76 @@ -79,6 +79,13 @@ config NET_DSA_TAG_KSZ
77           Say Y if you want to enable support for tagging frames for the
78           Microchip 8795/9477/9893 families of switches.
79  
80 +config NET_DSA_TAG_OCELOT
81 +       tristate "Tag driver for Ocelot family of switches"
82 +       select PACKING
83 +       help
84 +         Say Y or M if you want to enable support for tagging frames for the
85 +         Ocelot switches (VSC7511, VSC7512, VSC7513, VSC7514, VSC9959).
86 +
87  config NET_DSA_TAG_QCA
88         tristate "Tag driver for Qualcomm Atheros QCA8K switches"
89         help
90 --- a/net/dsa/Makefile
91 +++ b/net/dsa/Makefile
92 @@ -12,6 +12,7 @@ obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_g
93  obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
94  obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
95  obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
96 +obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o
97  obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
98  obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
99  obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
100 --- /dev/null
101 +++ b/net/dsa/tag_ocelot.c
102 @@ -0,0 +1,229 @@
103 +// SPDX-License-Identifier: GPL-2.0
104 +/* Copyright 2019 NXP Semiconductors
105 + */
106 +#include <soc/mscc/ocelot.h>
107 +#include <linux/packing.h>
108 +#include "dsa_priv.h"
109 +
110 +/* The CPU injection header and the CPU extraction header can have 3 types of
111 + * prefixes: long, short and no prefix. The format of the header itself is the
112 + * same in all 3 cases.
113 + *
114 + * Extraction with long prefix:
115 + *
116 + * +-------------------+-------------------+------+------+------------+-------+
117 + * | ff:ff:ff:ff:ff:ff | ff:ff:ff:ff:ff:ff | 8880 | 000a | extraction | frame |
118 + * |                   |                   |      |      |   header   |       |
119 + * +-------------------+-------------------+------+------+------------+-------+
120 + *        48 bits             48 bits      16 bits 16 bits  128 bits
121 + *
122 + * Extraction with short prefix:
123 + *
124 + *                                         +------+------+------------+-------+
125 + *                                         | 8880 | 000a | extraction | frame |
126 + *                                         |      |      |   header   |       |
127 + *                                         +------+------+------------+-------+
128 + *                                         16 bits 16 bits  128 bits
129 + *
130 + * Extraction with no prefix:
131 + *
132 + *                                                       +------------+-------+
133 + *                                                       | extraction | frame |
134 + *                                                       |   header   |       |
135 + *                                                       +------------+-------+
136 + *                                                          128 bits
137 + *
138 + *
139 + * Injection with long prefix:
140 + *
141 + * +-------------------+-------------------+------+------+------------+-------+
142 + * |      any dmac     |      any smac     | 8880 | 000a | injection  | frame |
143 + * |                   |                   |      |      |   header   |       |
144 + * +-------------------+-------------------+------+------+------------+-------+
145 + *        48 bits             48 bits      16 bits 16 bits  128 bits
146 + *
147 + * Injection with short prefix:
148 + *
149 + *                                         +------+------+------------+-------+
150 + *                                         | 8880 | 000a | injection  | frame |
151 + *                                         |      |      |   header   |       |
152 + *                                         +------+------+------------+-------+
153 + *                                         16 bits 16 bits  128 bits
154 + *
155 + * Injection with no prefix:
156 + *
157 + *                                                       +------------+-------+
158 + *                                                       | injection  | frame |
159 + *                                                       |   header   |       |
160 + *                                                       +------------+-------+
161 + *                                                          128 bits
162 + *
163 + * The injection header looks like this (network byte order, bit 127
164 + * is part of lowest address byte in memory, bit 0 is part of highest
165 + * address byte):
166 + *
167 + *         +------+------+------+------+------+------+------+------+
168 + * 127:120 |BYPASS| MASQ |          MASQ_PORT        |REW_OP|REW_OP|
169 + *         +------+------+------+------+------+------+------+------+
170 + * 119:112 |                         REW_OP                        |
171 + *         +------+------+------+------+------+------+------+------+
172 + * 111:104 |                         REW_VAL                       |
173 + *         +------+------+------+------+------+------+------+------+
174 + * 103: 96 |                         REW_VAL                       |
175 + *         +------+------+------+------+------+------+------+------+
176 + *  95: 88 |                         REW_VAL                       |
177 + *         +------+------+------+------+------+------+------+------+
178 + *  87: 80 |                         REW_VAL                       |
179 + *         +------+------+------+------+------+------+------+------+
180 + *  79: 72 |                          RSV                          |
181 + *         +------+------+------+------+------+------+------+------+
182 + *  71: 64 |            RSV            |           DEST            |
183 + *         +------+------+------+------+------+------+------+------+
184 + *  63: 56 |                         DEST                          |
185 + *         +------+------+------+------+------+------+------+------+
186 + *  55: 48 |                          RSV                          |
187 + *         +------+------+------+------+------+------+------+------+
188 + *  47: 40 |  RSV |         SRC_PORT          |     RSV     |TFRM_TIMER|
189 + *         +------+------+------+------+------+------+------+------+
190 + *  39: 32 |     TFRM_TIMER     |               RSV                |
191 + *         +------+------+------+------+------+------+------+------+
192 + *  31: 24 |  RSV |  DP  |   POP_CNT   |           CPUQ            |
193 + *         +------+------+------+------+------+------+------+------+
194 + *  23: 16 |           CPUQ            |      QOS_CLASS     |TAG_TYPE|
195 + *         +------+------+------+------+------+------+------+------+
196 + *  15:  8 |         PCP        |  DEI |            VID            |
197 + *         +------+------+------+------+------+------+------+------+
198 + *   7:  0 |                          VID                          |
199 + *         +------+------+------+------+------+------+------+------+
200 + *
201 + * And the extraction header looks like this:
202 + *
203 + *         +------+------+------+------+------+------+------+------+
204 + * 127:120 |  RSV |                  REW_OP                        |
205 + *         +------+------+------+------+------+------+------+------+
206 + * 119:112 |       REW_OP       |              REW_VAL             |
207 + *         +------+------+------+------+------+------+------+------+
208 + * 111:104 |                         REW_VAL                       |
209 + *         +------+------+------+------+------+------+------+------+
210 + * 103: 96 |                         REW_VAL                       |
211 + *         +------+------+------+------+------+------+------+------+
212 + *  95: 88 |                         REW_VAL                       |
213 + *         +------+------+------+------+------+------+------+------+
214 + *  87: 80 |       REW_VAL      |               LLEN               |
215 + *         +------+------+------+------+------+------+------+------+
216 + *  79: 72 | LLEN |                      WLEN                      |
217 + *         +------+------+------+------+------+------+------+------+
218 + *  71: 64 | WLEN |                      RSV                       |
219 + *         +------+------+------+------+------+------+------+------+
220 + *  63: 56 |                          RSV                          |
221 + *         +------+------+------+------+------+------+------+------+
222 + *  55: 48 |                          RSV                          |
223 + *         +------+------+------+------+------+------+------+------+
224 + *  47: 40 | RSV  |          SRC_PORT         |       ACL_ID       |
225 + *         +------+------+------+------+------+------+------+------+
226 + *  39: 32 |       ACL_ID       |  RSV |         SFLOW_ID          |
227 + *         +------+------+------+------+------+------+------+------+
228 + *  31: 24 |ACL_HIT| DP  |  LRN_FLAGS  |           CPUQ            |
229 + *         +------+------+------+------+------+------+------+------+
230 + *  23: 16 |           CPUQ            |      QOS_CLASS     |TAG_TYPE|
231 + *         +------+------+------+------+------+------+------+------+
232 + *  15:  8 |         PCP        |  DEI |            VID            |
233 + *         +------+------+------+------+------+------+------+------+
234 + *   7:  0 |                          VID                          |
235 + *         +------+------+------+------+------+------+------+------+
236 + */
237 +
238 +static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
239 +                                  struct net_device *netdev)
240 +{
241 +       struct dsa_port *dp = dsa_slave_to_port(netdev);
242 +       u64 bypass, dest, src, qos_class;
243 +       struct dsa_switch *ds = dp->ds;
244 +       int port = dp->index;
245 +       u8 *injection;
246 +
247 +       if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) {
248 +               netdev_err(netdev, "Cannot make room for tag.\n");
249 +               return NULL;
250 +       }
251 +
252 +       injection = skb_push(skb, OCELOT_TAG_LEN);
253 +
254 +       memset(injection, 0, OCELOT_TAG_LEN);
255 +
256 +       src = dsa_upstream_port(ds, port);
257 +       dest = BIT(port);
258 +       bypass = true;
259 +       qos_class = skb->priority;
260 +
261 +       packing(injection, &bypass,   127, 127, OCELOT_TAG_LEN, PACK, 0);
262 +       packing(injection, &dest,      68,  56, OCELOT_TAG_LEN, PACK, 0);
263 +       packing(injection, &src,       46,  43, OCELOT_TAG_LEN, PACK, 0);
264 +       packing(injection, &qos_class, 19,  17, OCELOT_TAG_LEN, PACK, 0);
265 +
266 +       return skb;
267 +}
268 +
269 +static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
270 +                                 struct net_device *netdev,
271 +                                 struct packet_type *pt)
272 +{
273 +       u64 src_port, qos_class;
274 +       u8 *start = skb->data;
275 +       u8 *extraction;
276 +
277 +       /* Revert skb->data by the amount consumed by the DSA master,
278 +        * so it points to the beginning of the frame.
279 +        */
280 +       skb_push(skb, ETH_HLEN);
281 +       /* We don't care about the long prefix, it is just for easy entrance
282 +        * into the DSA master's RX filter. Discard it now by moving it into
283 +        * the headroom.
284 +        */
285 +       skb_pull(skb, OCELOT_LONG_PREFIX_LEN);
286 +       /* And skb->data now points to the extraction frame header.
287 +        * Keep a pointer to it.
288 +        */
289 +       extraction = skb->data;
290 +       /* Now the EFH is part of the headroom as well */
291 +       skb_pull(skb, OCELOT_TAG_LEN);
292 +       /* Reset the pointer to the real MAC header */
293 +       skb_reset_mac_header(skb);
294 +       skb_reset_mac_len(skb);
295 +       /* And move skb->data to the correct location again */
296 +       skb_pull(skb, ETH_HLEN);
297 +
298 +       /* Remove from inet csum the extraction header */
299 +       skb_postpull_rcsum(skb, start, OCELOT_LONG_PREFIX_LEN + OCELOT_TAG_LEN);
300 +
301 +       packing(extraction, &src_port,  46, 43, OCELOT_TAG_LEN, UNPACK, 0);
302 +       packing(extraction, &qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0);
303 +
304 +       skb->dev = dsa_master_find_slave(netdev, 0, src_port);
305 +       if (!skb->dev)
306 +               /* The switch will reflect back some frames sent through
307 +                * sockets opened on the bare DSA master. These will come back
308 +                * with src_port equal to the index of the CPU port, for which
309 +                * there is no slave registered. So don't print any error
310 +                * message here (ignore and drop those frames).
311 +                */
312 +               return NULL;
313 +
314 +       skb->offload_fwd_mark = 1;
315 +       skb->priority = qos_class;
316 +
317 +       return skb;
318 +}
319 +
320 +static struct dsa_device_ops ocelot_netdev_ops = {
321 +       .name                   = "ocelot",
322 +       .proto                  = DSA_TAG_PROTO_OCELOT,
323 +       .xmit                   = ocelot_xmit,
324 +       .rcv                    = ocelot_rcv,
325 +       .overhead               = OCELOT_TAG_LEN + OCELOT_LONG_PREFIX_LEN,
326 +};
327 +
328 +MODULE_LICENSE("GPL v2");
329 +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
330 +
331 +module_dsa_tag_driver(ocelot_netdev_ops);
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