1 // SPDX-License-Identifier: GPL-2.0+
2 /* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
5 */
6
7 #include "sparx5_main_regs.h"
8 #include "sparx5_main.h"
9
10 #define XTR_EOF_0 ntohl((__force __be32)0x80000000u)
11 #define XTR_EOF_1 ntohl((__force __be32)0x80000001u)
12 #define XTR_EOF_2 ntohl((__force __be32)0x80000002u)
13 #define XTR_EOF_3 ntohl((__force __be32)0x80000003u)
14 #define XTR_PRUNED ntohl((__force __be32)0x80000004u)
15 #define XTR_ABORT ntohl((__force __be32)0x80000005u)
16 #define XTR_ESCAPE ntohl((__force __be32)0x80000006u)
17 #define XTR_NOT_READY ntohl((__force __be32)0x80000007u)
18
19 #define XTR_VALID_BYTES(x) (4 - ((x) & 3))
20
21 #define INJ_TIMEOUT_NS 50000
22
sparx5_xtr_flush(struct sparx5 * sparx5,u8 grp)23 void sparx5_xtr_flush(struct sparx5 *sparx5, u8 grp)
24 {
25 /* Start flush */
26 spx5_wr(QS_XTR_FLUSH_FLUSH_SET(BIT(grp)), sparx5, QS_XTR_FLUSH);
27
28 /* Allow to drain */
29 mdelay(1);
30
31 /* All Queues normal */
32 spx5_wr(0, sparx5, QS_XTR_FLUSH);
33 }
34
sparx5_ifh_parse(u32 * ifh,struct frame_info * info)35 void sparx5_ifh_parse(u32 *ifh, struct frame_info *info)
36 {
37 u8 *xtr_hdr = (u8 *)ifh;
38
39 /* FWD is bit 45-72 (28 bits), but we only read the 27 LSB for now */
40 u32 fwd =
41 ((u32)xtr_hdr[27] << 24) |
42 ((u32)xtr_hdr[28] << 16) |
43 ((u32)xtr_hdr[29] << 8) |
44 ((u32)xtr_hdr[30] << 0);
45 fwd = (fwd >> 5);
46 info->src_port = FIELD_GET(GENMASK(7, 1), fwd);
47
48 /*
49 * Bit 270-271 are occasionally unexpectedly set by the hardware,
50 * clear bits before extracting timestamp
51 */
52 info->timestamp =
53 ((u64)(xtr_hdr[2] & GENMASK(5, 0)) << 24) |
54 ((u64)xtr_hdr[3] << 16) |
55 ((u64)xtr_hdr[4] << 8) |
56 ((u64)xtr_hdr[5] << 0);
57 }
58
sparx5_xtr_grp(struct sparx5 * sparx5,u8 grp,bool byte_swap)59 static void sparx5_xtr_grp(struct sparx5 *sparx5, u8 grp, bool byte_swap)
60 {
61 bool eof_flag = false, pruned_flag = false, abort_flag = false;
62 struct net_device *netdev;
63 struct sparx5_port *port;
64 struct frame_info fi;
65 int i, byte_cnt = 0;
66 struct sk_buff *skb;
67 u32 ifh[IFH_LEN];
68 u32 *rxbuf;
69
70 /* Get IFH */
71 for (i = 0; i < IFH_LEN; i++)
72 ifh[i] = spx5_rd(sparx5, QS_XTR_RD(grp));
73
74 /* Decode IFH (what's needed) */
75 sparx5_ifh_parse(ifh, &fi);
76
77 /* Map to port netdev */
78 port = fi.src_port < SPX5_PORTS ?
79 sparx5->ports[fi.src_port] : NULL;
80 if (!port || !port->ndev) {
81 dev_err(sparx5->dev, "Data on inactive port %d\n", fi.src_port);
82 sparx5_xtr_flush(sparx5, grp);
83 return;
84 }
85
86 /* Have netdev, get skb */
87 netdev = port->ndev;
88 skb = netdev_alloc_skb(netdev, netdev->mtu + ETH_HLEN);
89 if (!skb) {
90 sparx5_xtr_flush(sparx5, grp);
91 dev_err(sparx5->dev, "No skb allocated\n");
92 netdev->stats.rx_dropped++;
93 return;
94 }
95 rxbuf = (u32 *)skb->data;
96
97 /* Now, pull frame data */
98 while (!eof_flag) {
99 u32 val = spx5_rd(sparx5, QS_XTR_RD(grp));
100 u32 cmp = val;
101
102 if (byte_swap)
103 cmp = ntohl((__force __be32)val);
104
105 switch (cmp) {
106 case XTR_NOT_READY:
107 break;
108 case XTR_ABORT:
109 /* No accompanying data */
110 abort_flag = true;
111 eof_flag = true;
112 break;
113 case XTR_EOF_0:
114 case XTR_EOF_1:
115 case XTR_EOF_2:
116 case XTR_EOF_3:
117 /* This assumes STATUS_WORD_POS == 1, Status
118 * just after last data
119 */
120 if (!byte_swap)
121 val = ntohl((__force __be32)val);
122 byte_cnt -= (4 - XTR_VALID_BYTES(val));
123 eof_flag = true;
124 break;
125 case XTR_PRUNED:
126 /* But get the last 4 bytes as well */
127 eof_flag = true;
128 pruned_flag = true;
129 fallthrough;
130 case XTR_ESCAPE:
131 *rxbuf = spx5_rd(sparx5, QS_XTR_RD(grp));
132 byte_cnt += 4;
133 rxbuf++;
134 break;
135 default:
136 *rxbuf = val;
137 byte_cnt += 4;
138 rxbuf++;
139 }
140 }
141
142 if (abort_flag || pruned_flag || !eof_flag) {
143 netdev_err(netdev, "Discarded frame: abort:%d pruned:%d eof:%d\n",
144 abort_flag, pruned_flag, eof_flag);
145 kfree_skb(skb);
146 netdev->stats.rx_dropped++;
147 return;
148 }
149
150 /* Everything we see on an interface that is in the HW bridge
151 * has already been forwarded
152 */
153 if (test_bit(port->portno, sparx5->bridge_mask))
154 skb->offload_fwd_mark = 1;
155
156 /* Finish up skb */
157 skb_put(skb, byte_cnt - ETH_FCS_LEN);
158 eth_skb_pad(skb);
159 sparx5_ptp_rxtstamp(sparx5, skb, fi.timestamp);
160 skb->protocol = eth_type_trans(skb, netdev);
161 netdev->stats.rx_bytes += skb->len;
162 netdev->stats.rx_packets++;
163 netif_rx(skb);
164 }
165
sparx5_inject(struct sparx5 * sparx5,u32 * ifh,struct sk_buff * skb,struct net_device * ndev)166 static int sparx5_inject(struct sparx5 *sparx5,
167 u32 *ifh,
168 struct sk_buff *skb,
169 struct net_device *ndev)
170 {
171 int grp = INJ_QUEUE;
172 u32 val, w, count;
173 u8 *buf;
174
175 val = spx5_rd(sparx5, QS_INJ_STATUS);
176 if (!(QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp))) {
177 pr_err_ratelimited("Injection: Queue not ready: 0x%lx\n",
178 QS_INJ_STATUS_FIFO_RDY_GET(val));
179 return -EBUSY;
180 }
181
182 /* Indicate SOF */
183 spx5_wr(QS_INJ_CTRL_SOF_SET(1) |
184 QS_INJ_CTRL_GAP_SIZE_SET(1),
185 sparx5, QS_INJ_CTRL(grp));
186
187 /* Write the IFH to the chip. */
188 for (w = 0; w < IFH_LEN; w++)
189 spx5_wr(ifh[w], sparx5, QS_INJ_WR(grp));
190
191 /* Write words, round up */
192 count = DIV_ROUND_UP(skb->len, 4);
193 buf = skb->data;
194 for (w = 0; w < count; w++, buf += 4) {
195 val = get_unaligned((const u32 *)buf);
196 spx5_wr(val, sparx5, QS_INJ_WR(grp));
197 }
198
199 /* Add padding */
200 while (w < (60 / 4)) {
201 spx5_wr(0, sparx5, QS_INJ_WR(grp));
202 w++;
203 }
204
205 /* Indicate EOF and valid bytes in last word */
206 spx5_wr(QS_INJ_CTRL_GAP_SIZE_SET(1) |
207 QS_INJ_CTRL_VLD_BYTES_SET(skb->len < 60 ? 0 : skb->len % 4) |
208 QS_INJ_CTRL_EOF_SET(1),
209 sparx5, QS_INJ_CTRL(grp));
210
211 /* Add dummy CRC */
212 spx5_wr(0, sparx5, QS_INJ_WR(grp));
213 w++;
214
215 val = spx5_rd(sparx5, QS_INJ_STATUS);
216 if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
217 struct sparx5_port *port = netdev_priv(ndev);
218
219 pr_err_ratelimited("Injection: Watermark reached: 0x%lx\n",
220 QS_INJ_STATUS_WMARK_REACHED_GET(val));
221 netif_stop_queue(ndev);
222 hrtimer_start(&port->inj_timer, INJ_TIMEOUT_NS,
223 HRTIMER_MODE_REL);
224 }
225
226 return NETDEV_TX_OK;
227 }
228
sparx5_port_xmit_impl(struct sk_buff * skb,struct net_device * dev)229 netdev_tx_t sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev)
230 {
231 struct net_device_stats *stats = &dev->stats;
232 struct sparx5_port *port = netdev_priv(dev);
233 struct sparx5 *sparx5 = port->sparx5;
234 u32 ifh[IFH_LEN];
235 netdev_tx_t ret;
236
237 memset(ifh, 0, IFH_LEN * 4);
238 sparx5_set_port_ifh(ifh, port->portno);
239
240 if (sparx5->ptp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
241 if (sparx5_ptp_txtstamp_request(port, skb) < 0)
242 return NETDEV_TX_BUSY;
243
244 sparx5_set_port_ifh_rew_op(ifh, SPARX5_SKB_CB(skb)->rew_op);
245 sparx5_set_port_ifh_pdu_type(ifh, SPARX5_SKB_CB(skb)->pdu_type);
246 sparx5_set_port_ifh_pdu_w16_offset(ifh, SPARX5_SKB_CB(skb)->pdu_w16_offset);
247 sparx5_set_port_ifh_timestamp(ifh, SPARX5_SKB_CB(skb)->ts_id);
248 }
249
250 skb_tx_timestamp(skb);
251 spin_lock(&sparx5->tx_lock);
252 if (sparx5->fdma_irq > 0)
253 ret = sparx5_fdma_xmit(sparx5, ifh, skb);
254 else
255 ret = sparx5_inject(sparx5, ifh, skb, dev);
256 spin_unlock(&sparx5->tx_lock);
257
258 if (ret == -EBUSY)
259 goto busy;
260 if (ret < 0)
261 goto drop;
262
263 stats->tx_bytes += skb->len;
264 stats->tx_packets++;
265 sparx5->tx.packets++;
266
267 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
268 SPARX5_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
269 return NETDEV_TX_OK;
270
271 dev_consume_skb_any(skb);
272 return NETDEV_TX_OK;
273 drop:
274 stats->tx_dropped++;
275 sparx5->tx.dropped++;
276 dev_kfree_skb_any(skb);
277 return NETDEV_TX_OK;
278 busy:
279 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
280 SPARX5_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
281 sparx5_ptp_txtstamp_release(port, skb);
282 return NETDEV_TX_BUSY;
283 }
284
sparx5_injection_timeout(struct hrtimer * tmr)285 static enum hrtimer_restart sparx5_injection_timeout(struct hrtimer *tmr)
286 {
287 struct sparx5_port *port = container_of(tmr, struct sparx5_port,
288 inj_timer);
289 int grp = INJ_QUEUE;
290 u32 val;
291
292 val = spx5_rd(port->sparx5, QS_INJ_STATUS);
293 if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
294 pr_err_ratelimited("Injection: Reset watermark count\n");
295 /* Reset Watermark count to restart */
296 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
297 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
298 port->sparx5,
299 DSM_DEV_TX_STOP_WM_CFG(port->portno));
300 }
301 netif_wake_queue(port->ndev);
302 return HRTIMER_NORESTART;
303 }
304
sparx5_manual_injection_mode(struct sparx5 * sparx5)305 int sparx5_manual_injection_mode(struct sparx5 *sparx5)
306 {
307 const int byte_swap = 1;
308 int portno;
309
310 /* Change mode to manual extraction and injection */
311 spx5_wr(QS_XTR_GRP_CFG_MODE_SET(1) |
312 QS_XTR_GRP_CFG_STATUS_WORD_POS_SET(1) |
313 QS_XTR_GRP_CFG_BYTE_SWAP_SET(byte_swap),
314 sparx5, QS_XTR_GRP_CFG(XTR_QUEUE));
315 spx5_wr(QS_INJ_GRP_CFG_MODE_SET(1) |
316 QS_INJ_GRP_CFG_BYTE_SWAP_SET(byte_swap),
317 sparx5, QS_INJ_GRP_CFG(INJ_QUEUE));
318
319 /* CPU ports capture setup */
320 for (portno = SPX5_PORT_CPU_0; portno <= SPX5_PORT_CPU_1; portno++) {
321 /* ASM CPU port: No preamble, IFH, enable padding */
322 spx5_wr(ASM_PORT_CFG_PAD_ENA_SET(1) |
323 ASM_PORT_CFG_NO_PREAMBLE_ENA_SET(1) |
324 ASM_PORT_CFG_INJ_FORMAT_CFG_SET(1), /* 1 = IFH */
325 sparx5, ASM_PORT_CFG(portno));
326
327 /* Reset WM cnt to unclog queued frames */
328 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
329 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
330 sparx5,
331 DSM_DEV_TX_STOP_WM_CFG(portno));
332
333 /* Set Disassembler Stop Watermark level */
334 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM_SET(0),
335 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM,
336 sparx5,
337 DSM_DEV_TX_STOP_WM_CFG(portno));
338
339 /* Enable Disassembler buffer underrun watchdog
340 */
341 spx5_rmw(DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS_SET(0),
342 DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS,
343 sparx5,
344 DSM_BUF_CFG(portno));
345 }
346 return 0;
347 }
348
sparx5_xtr_handler(int irq,void * _sparx5)349 irqreturn_t sparx5_xtr_handler(int irq, void *_sparx5)
350 {
351 struct sparx5 *s5 = _sparx5;
352 int poll = 64;
353
354 /* Check data in queue */
355 while (spx5_rd(s5, QS_XTR_DATA_PRESENT) & BIT(XTR_QUEUE) && poll-- > 0)
356 sparx5_xtr_grp(s5, XTR_QUEUE, false);
357
358 return IRQ_HANDLED;
359 }
360
sparx5_port_inj_timer_setup(struct sparx5_port * port)361 void sparx5_port_inj_timer_setup(struct sparx5_port *port)
362 {
363 hrtimer_init(&port->inj_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
364 port->inj_timer.function = sparx5_injection_timeout;
365 }
366