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