sunvnet.c 28 KB

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  1. /* sunvnet.c: Sun LDOM Virtual Network Driver.
  2. *
  3. * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  4. */
  5. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  6. #include <linux/module.h>
  7. #include <linux/kernel.h>
  8. #include <linux/types.h>
  9. #include <linux/slab.h>
  10. #include <linux/delay.h>
  11. #include <linux/init.h>
  12. #include <linux/netdevice.h>
  13. #include <linux/ethtool.h>
  14. #include <linux/etherdevice.h>
  15. #include <linux/mutex.h>
  16. #include <asm/vio.h>
  17. #include <asm/ldc.h>
  18. #include "sunvnet.h"
  19. #define DRV_MODULE_NAME "sunvnet"
  20. #define DRV_MODULE_VERSION "1.0"
  21. #define DRV_MODULE_RELDATE "June 25, 2007"
  22. static char version[] __devinitdata =
  23. DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  24. MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  25. MODULE_DESCRIPTION("Sun LDOM virtual network driver");
  26. MODULE_LICENSE("GPL");
  27. MODULE_VERSION(DRV_MODULE_VERSION);
  28. /* Ordered from largest major to lowest */
  29. static struct vio_version vnet_versions[] = {
  30. { .major = 1, .minor = 0 },
  31. };
  32. static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
  33. {
  34. return vio_dring_avail(dr, VNET_TX_RING_SIZE);
  35. }
  36. static int vnet_handle_unknown(struct vnet_port *port, void *arg)
  37. {
  38. struct vio_msg_tag *pkt = arg;
  39. pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
  40. pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
  41. pr_err("Resetting connection\n");
  42. ldc_disconnect(port->vio.lp);
  43. return -ECONNRESET;
  44. }
  45. static int vnet_send_attr(struct vio_driver_state *vio)
  46. {
  47. struct vnet_port *port = to_vnet_port(vio);
  48. struct net_device *dev = port->vp->dev;
  49. struct vio_net_attr_info pkt;
  50. int i;
  51. memset(&pkt, 0, sizeof(pkt));
  52. pkt.tag.type = VIO_TYPE_CTRL;
  53. pkt.tag.stype = VIO_SUBTYPE_INFO;
  54. pkt.tag.stype_env = VIO_ATTR_INFO;
  55. pkt.tag.sid = vio_send_sid(vio);
  56. pkt.xfer_mode = VIO_DRING_MODE;
  57. pkt.addr_type = VNET_ADDR_ETHERMAC;
  58. pkt.ack_freq = 0;
  59. for (i = 0; i < 6; i++)
  60. pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
  61. pkt.mtu = ETH_FRAME_LEN;
  62. viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
  63. "ackfreq[%u] mtu[%llu]\n",
  64. pkt.xfer_mode, pkt.addr_type,
  65. (unsigned long long) pkt.addr,
  66. pkt.ack_freq,
  67. (unsigned long long) pkt.mtu);
  68. return vio_ldc_send(vio, &pkt, sizeof(pkt));
  69. }
  70. static int handle_attr_info(struct vio_driver_state *vio,
  71. struct vio_net_attr_info *pkt)
  72. {
  73. viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
  74. "ackfreq[%u] mtu[%llu]\n",
  75. pkt->xfer_mode, pkt->addr_type,
  76. (unsigned long long) pkt->addr,
  77. pkt->ack_freq,
  78. (unsigned long long) pkt->mtu);
  79. pkt->tag.sid = vio_send_sid(vio);
  80. if (pkt->xfer_mode != VIO_DRING_MODE ||
  81. pkt->addr_type != VNET_ADDR_ETHERMAC ||
  82. pkt->mtu != ETH_FRAME_LEN) {
  83. viodbg(HS, "SEND NET ATTR NACK\n");
  84. pkt->tag.stype = VIO_SUBTYPE_NACK;
  85. (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
  86. return -ECONNRESET;
  87. } else {
  88. viodbg(HS, "SEND NET ATTR ACK\n");
  89. pkt->tag.stype = VIO_SUBTYPE_ACK;
  90. return vio_ldc_send(vio, pkt, sizeof(*pkt));
  91. }
  92. }
  93. static int handle_attr_ack(struct vio_driver_state *vio,
  94. struct vio_net_attr_info *pkt)
  95. {
  96. viodbg(HS, "GOT NET ATTR ACK\n");
  97. return 0;
  98. }
  99. static int handle_attr_nack(struct vio_driver_state *vio,
  100. struct vio_net_attr_info *pkt)
  101. {
  102. viodbg(HS, "GOT NET ATTR NACK\n");
  103. return -ECONNRESET;
  104. }
  105. static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
  106. {
  107. struct vio_net_attr_info *pkt = arg;
  108. switch (pkt->tag.stype) {
  109. case VIO_SUBTYPE_INFO:
  110. return handle_attr_info(vio, pkt);
  111. case VIO_SUBTYPE_ACK:
  112. return handle_attr_ack(vio, pkt);
  113. case VIO_SUBTYPE_NACK:
  114. return handle_attr_nack(vio, pkt);
  115. default:
  116. return -ECONNRESET;
  117. }
  118. }
  119. static void vnet_handshake_complete(struct vio_driver_state *vio)
  120. {
  121. struct vio_dring_state *dr;
  122. dr = &vio->drings[VIO_DRIVER_RX_RING];
  123. dr->snd_nxt = dr->rcv_nxt = 1;
  124. dr = &vio->drings[VIO_DRIVER_TX_RING];
  125. dr->snd_nxt = dr->rcv_nxt = 1;
  126. }
  127. /* The hypervisor interface that implements copying to/from imported
  128. * memory from another domain requires that copies are done to 8-byte
  129. * aligned buffers, and that the lengths of such copies are also 8-byte
  130. * multiples.
  131. *
  132. * So we align skb->data to an 8-byte multiple and pad-out the data
  133. * area so we can round the copy length up to the next multiple of
  134. * 8 for the copy.
  135. *
  136. * The transmitter puts the actual start of the packet 6 bytes into
  137. * the buffer it sends over, so that the IP headers after the ethernet
  138. * header are aligned properly. These 6 bytes are not in the descriptor
  139. * length, they are simply implied. This offset is represented using
  140. * the VNET_PACKET_SKIP macro.
  141. */
  142. static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
  143. unsigned int len)
  144. {
  145. struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
  146. unsigned long addr, off;
  147. if (unlikely(!skb))
  148. return NULL;
  149. addr = (unsigned long) skb->data;
  150. off = ((addr + 7UL) & ~7UL) - addr;
  151. if (off)
  152. skb_reserve(skb, off);
  153. return skb;
  154. }
  155. static int vnet_rx_one(struct vnet_port *port, unsigned int len,
  156. struct ldc_trans_cookie *cookies, int ncookies)
  157. {
  158. struct net_device *dev = port->vp->dev;
  159. unsigned int copy_len;
  160. struct sk_buff *skb;
  161. int err;
  162. err = -EMSGSIZE;
  163. if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
  164. dev->stats.rx_length_errors++;
  165. goto out_dropped;
  166. }
  167. skb = alloc_and_align_skb(dev, len);
  168. err = -ENOMEM;
  169. if (unlikely(!skb)) {
  170. dev->stats.rx_missed_errors++;
  171. goto out_dropped;
  172. }
  173. copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
  174. skb_put(skb, copy_len);
  175. err = ldc_copy(port->vio.lp, LDC_COPY_IN,
  176. skb->data, copy_len, 0,
  177. cookies, ncookies);
  178. if (unlikely(err < 0)) {
  179. dev->stats.rx_frame_errors++;
  180. goto out_free_skb;
  181. }
  182. skb_pull(skb, VNET_PACKET_SKIP);
  183. skb_trim(skb, len);
  184. skb->protocol = eth_type_trans(skb, dev);
  185. dev->stats.rx_packets++;
  186. dev->stats.rx_bytes += len;
  187. netif_rx(skb);
  188. return 0;
  189. out_free_skb:
  190. kfree_skb(skb);
  191. out_dropped:
  192. dev->stats.rx_dropped++;
  193. return err;
  194. }
  195. static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
  196. u32 start, u32 end, u8 vio_dring_state)
  197. {
  198. struct vio_dring_data hdr = {
  199. .tag = {
  200. .type = VIO_TYPE_DATA,
  201. .stype = VIO_SUBTYPE_ACK,
  202. .stype_env = VIO_DRING_DATA,
  203. .sid = vio_send_sid(&port->vio),
  204. },
  205. .dring_ident = dr->ident,
  206. .start_idx = start,
  207. .end_idx = end,
  208. .state = vio_dring_state,
  209. };
  210. int err, delay;
  211. hdr.seq = dr->snd_nxt;
  212. delay = 1;
  213. do {
  214. err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
  215. if (err > 0) {
  216. dr->snd_nxt++;
  217. break;
  218. }
  219. udelay(delay);
  220. if ((delay <<= 1) > 128)
  221. delay = 128;
  222. } while (err == -EAGAIN);
  223. return err;
  224. }
  225. static u32 next_idx(u32 idx, struct vio_dring_state *dr)
  226. {
  227. if (++idx == dr->num_entries)
  228. idx = 0;
  229. return idx;
  230. }
  231. static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
  232. {
  233. if (idx == 0)
  234. idx = dr->num_entries - 1;
  235. else
  236. idx--;
  237. return idx;
  238. }
  239. static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
  240. struct vio_dring_state *dr,
  241. u32 index)
  242. {
  243. struct vio_net_desc *desc = port->vio.desc_buf;
  244. int err;
  245. err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
  246. (index * dr->entry_size),
  247. dr->cookies, dr->ncookies);
  248. if (err < 0)
  249. return ERR_PTR(err);
  250. return desc;
  251. }
  252. static int put_rx_desc(struct vnet_port *port,
  253. struct vio_dring_state *dr,
  254. struct vio_net_desc *desc,
  255. u32 index)
  256. {
  257. int err;
  258. err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
  259. (index * dr->entry_size),
  260. dr->cookies, dr->ncookies);
  261. if (err < 0)
  262. return err;
  263. return 0;
  264. }
  265. static int vnet_walk_rx_one(struct vnet_port *port,
  266. struct vio_dring_state *dr,
  267. u32 index, int *needs_ack)
  268. {
  269. struct vio_net_desc *desc = get_rx_desc(port, dr, index);
  270. struct vio_driver_state *vio = &port->vio;
  271. int err;
  272. if (IS_ERR(desc))
  273. return PTR_ERR(desc);
  274. viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
  275. desc->hdr.state, desc->hdr.ack,
  276. desc->size, desc->ncookies,
  277. desc->cookies[0].cookie_addr,
  278. desc->cookies[0].cookie_size);
  279. if (desc->hdr.state != VIO_DESC_READY)
  280. return 1;
  281. err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
  282. if (err == -ECONNRESET)
  283. return err;
  284. desc->hdr.state = VIO_DESC_DONE;
  285. err = put_rx_desc(port, dr, desc, index);
  286. if (err < 0)
  287. return err;
  288. *needs_ack = desc->hdr.ack;
  289. return 0;
  290. }
  291. static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
  292. u32 start, u32 end)
  293. {
  294. struct vio_driver_state *vio = &port->vio;
  295. int ack_start = -1, ack_end = -1;
  296. end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
  297. viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
  298. while (start != end) {
  299. int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
  300. if (err == -ECONNRESET)
  301. return err;
  302. if (err != 0)
  303. break;
  304. if (ack_start == -1)
  305. ack_start = start;
  306. ack_end = start;
  307. start = next_idx(start, dr);
  308. if (ack && start != end) {
  309. err = vnet_send_ack(port, dr, ack_start, ack_end,
  310. VIO_DRING_ACTIVE);
  311. if (err == -ECONNRESET)
  312. return err;
  313. ack_start = -1;
  314. }
  315. }
  316. if (unlikely(ack_start == -1))
  317. ack_start = ack_end = prev_idx(start, dr);
  318. return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
  319. }
  320. static int vnet_rx(struct vnet_port *port, void *msgbuf)
  321. {
  322. struct vio_dring_data *pkt = msgbuf;
  323. struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
  324. struct vio_driver_state *vio = &port->vio;
  325. viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
  326. pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
  327. if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
  328. return 0;
  329. if (unlikely(pkt->seq != dr->rcv_nxt)) {
  330. pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
  331. pkt->seq, dr->rcv_nxt);
  332. return 0;
  333. }
  334. dr->rcv_nxt++;
  335. /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
  336. return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
  337. }
  338. static int idx_is_pending(struct vio_dring_state *dr, u32 end)
  339. {
  340. u32 idx = dr->cons;
  341. int found = 0;
  342. while (idx != dr->prod) {
  343. if (idx == end) {
  344. found = 1;
  345. break;
  346. }
  347. idx = next_idx(idx, dr);
  348. }
  349. return found;
  350. }
  351. static int vnet_ack(struct vnet_port *port, void *msgbuf)
  352. {
  353. struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  354. struct vio_dring_data *pkt = msgbuf;
  355. struct net_device *dev;
  356. struct vnet *vp;
  357. u32 end;
  358. if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
  359. return 0;
  360. end = pkt->end_idx;
  361. if (unlikely(!idx_is_pending(dr, end)))
  362. return 0;
  363. dr->cons = next_idx(end, dr);
  364. vp = port->vp;
  365. dev = vp->dev;
  366. if (unlikely(netif_queue_stopped(dev) &&
  367. vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
  368. return 1;
  369. return 0;
  370. }
  371. static int vnet_nack(struct vnet_port *port, void *msgbuf)
  372. {
  373. /* XXX just reset or similar XXX */
  374. return 0;
  375. }
  376. static int handle_mcast(struct vnet_port *port, void *msgbuf)
  377. {
  378. struct vio_net_mcast_info *pkt = msgbuf;
  379. if (pkt->tag.stype != VIO_SUBTYPE_ACK)
  380. pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
  381. port->vp->dev->name,
  382. pkt->tag.type,
  383. pkt->tag.stype,
  384. pkt->tag.stype_env,
  385. pkt->tag.sid);
  386. return 0;
  387. }
  388. static void maybe_tx_wakeup(struct vnet *vp)
  389. {
  390. struct net_device *dev = vp->dev;
  391. netif_tx_lock(dev);
  392. if (likely(netif_queue_stopped(dev))) {
  393. struct vnet_port *port;
  394. int wake = 1;
  395. list_for_each_entry(port, &vp->port_list, list) {
  396. struct vio_dring_state *dr;
  397. dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  398. if (vnet_tx_dring_avail(dr) <
  399. VNET_TX_WAKEUP_THRESH(dr)) {
  400. wake = 0;
  401. break;
  402. }
  403. }
  404. if (wake)
  405. netif_wake_queue(dev);
  406. }
  407. netif_tx_unlock(dev);
  408. }
  409. static void vnet_event(void *arg, int event)
  410. {
  411. struct vnet_port *port = arg;
  412. struct vio_driver_state *vio = &port->vio;
  413. unsigned long flags;
  414. int tx_wakeup, err;
  415. spin_lock_irqsave(&vio->lock, flags);
  416. if (unlikely(event == LDC_EVENT_RESET ||
  417. event == LDC_EVENT_UP)) {
  418. vio_link_state_change(vio, event);
  419. spin_unlock_irqrestore(&vio->lock, flags);
  420. if (event == LDC_EVENT_RESET)
  421. vio_port_up(vio);
  422. return;
  423. }
  424. if (unlikely(event != LDC_EVENT_DATA_READY)) {
  425. pr_warning("Unexpected LDC event %d\n", event);
  426. spin_unlock_irqrestore(&vio->lock, flags);
  427. return;
  428. }
  429. tx_wakeup = err = 0;
  430. while (1) {
  431. union {
  432. struct vio_msg_tag tag;
  433. u64 raw[8];
  434. } msgbuf;
  435. err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
  436. if (unlikely(err < 0)) {
  437. if (err == -ECONNRESET)
  438. vio_conn_reset(vio);
  439. break;
  440. }
  441. if (err == 0)
  442. break;
  443. viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
  444. msgbuf.tag.type,
  445. msgbuf.tag.stype,
  446. msgbuf.tag.stype_env,
  447. msgbuf.tag.sid);
  448. err = vio_validate_sid(vio, &msgbuf.tag);
  449. if (err < 0)
  450. break;
  451. if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
  452. if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
  453. err = vnet_rx(port, &msgbuf);
  454. } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
  455. err = vnet_ack(port, &msgbuf);
  456. if (err > 0)
  457. tx_wakeup |= err;
  458. } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
  459. err = vnet_nack(port, &msgbuf);
  460. }
  461. } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
  462. if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
  463. err = handle_mcast(port, &msgbuf);
  464. else
  465. err = vio_control_pkt_engine(vio, &msgbuf);
  466. if (err)
  467. break;
  468. } else {
  469. err = vnet_handle_unknown(port, &msgbuf);
  470. }
  471. if (err == -ECONNRESET)
  472. break;
  473. }
  474. spin_unlock(&vio->lock);
  475. if (unlikely(tx_wakeup && err != -ECONNRESET))
  476. maybe_tx_wakeup(port->vp);
  477. local_irq_restore(flags);
  478. }
  479. static int __vnet_tx_trigger(struct vnet_port *port)
  480. {
  481. struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  482. struct vio_dring_data hdr = {
  483. .tag = {
  484. .type = VIO_TYPE_DATA,
  485. .stype = VIO_SUBTYPE_INFO,
  486. .stype_env = VIO_DRING_DATA,
  487. .sid = vio_send_sid(&port->vio),
  488. },
  489. .dring_ident = dr->ident,
  490. .start_idx = dr->prod,
  491. .end_idx = (u32) -1,
  492. };
  493. int err, delay;
  494. hdr.seq = dr->snd_nxt;
  495. delay = 1;
  496. do {
  497. err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
  498. if (err > 0) {
  499. dr->snd_nxt++;
  500. break;
  501. }
  502. udelay(delay);
  503. if ((delay <<= 1) > 128)
  504. delay = 128;
  505. } while (err == -EAGAIN);
  506. return err;
  507. }
  508. struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
  509. {
  510. unsigned int hash = vnet_hashfn(skb->data);
  511. struct hlist_head *hp = &vp->port_hash[hash];
  512. struct hlist_node *n;
  513. struct vnet_port *port;
  514. hlist_for_each_entry(port, n, hp, hash) {
  515. if (!compare_ether_addr(port->raddr, skb->data))
  516. return port;
  517. }
  518. port = NULL;
  519. if (!list_empty(&vp->port_list))
  520. port = list_entry(vp->port_list.next, struct vnet_port, list);
  521. return port;
  522. }
  523. struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
  524. {
  525. struct vnet_port *ret;
  526. unsigned long flags;
  527. spin_lock_irqsave(&vp->lock, flags);
  528. ret = __tx_port_find(vp, skb);
  529. spin_unlock_irqrestore(&vp->lock, flags);
  530. return ret;
  531. }
  532. static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
  533. {
  534. struct vnet *vp = netdev_priv(dev);
  535. struct vnet_port *port = tx_port_find(vp, skb);
  536. struct vio_dring_state *dr;
  537. struct vio_net_desc *d;
  538. unsigned long flags;
  539. unsigned int len;
  540. void *tx_buf;
  541. int i, err;
  542. if (unlikely(!port))
  543. goto out_dropped;
  544. spin_lock_irqsave(&port->vio.lock, flags);
  545. dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  546. if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
  547. if (!netif_queue_stopped(dev)) {
  548. netif_stop_queue(dev);
  549. /* This is a hard error, log it. */
  550. netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
  551. dev->stats.tx_errors++;
  552. }
  553. spin_unlock_irqrestore(&port->vio.lock, flags);
  554. return NETDEV_TX_BUSY;
  555. }
  556. d = vio_dring_cur(dr);
  557. tx_buf = port->tx_bufs[dr->prod].buf;
  558. skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
  559. len = skb->len;
  560. if (len < ETH_ZLEN) {
  561. len = ETH_ZLEN;
  562. memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
  563. }
  564. d->hdr.ack = VIO_ACK_ENABLE;
  565. d->size = len;
  566. d->ncookies = port->tx_bufs[dr->prod].ncookies;
  567. for (i = 0; i < d->ncookies; i++)
  568. d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
  569. /* This has to be a non-SMP write barrier because we are writing
  570. * to memory which is shared with the peer LDOM.
  571. */
  572. wmb();
  573. d->hdr.state = VIO_DESC_READY;
  574. err = __vnet_tx_trigger(port);
  575. if (unlikely(err < 0)) {
  576. netdev_info(dev, "TX trigger error %d\n", err);
  577. d->hdr.state = VIO_DESC_FREE;
  578. dev->stats.tx_carrier_errors++;
  579. goto out_dropped_unlock;
  580. }
  581. dev->stats.tx_packets++;
  582. dev->stats.tx_bytes += skb->len;
  583. dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
  584. if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
  585. netif_stop_queue(dev);
  586. if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
  587. netif_wake_queue(dev);
  588. }
  589. spin_unlock_irqrestore(&port->vio.lock, flags);
  590. dev_kfree_skb(skb);
  591. return NETDEV_TX_OK;
  592. out_dropped_unlock:
  593. spin_unlock_irqrestore(&port->vio.lock, flags);
  594. out_dropped:
  595. dev_kfree_skb(skb);
  596. dev->stats.tx_dropped++;
  597. return NETDEV_TX_OK;
  598. }
  599. static void vnet_tx_timeout(struct net_device *dev)
  600. {
  601. /* XXX Implement me XXX */
  602. }
  603. static int vnet_open(struct net_device *dev)
  604. {
  605. netif_carrier_on(dev);
  606. netif_start_queue(dev);
  607. return 0;
  608. }
  609. static int vnet_close(struct net_device *dev)
  610. {
  611. netif_stop_queue(dev);
  612. netif_carrier_off(dev);
  613. return 0;
  614. }
  615. static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
  616. {
  617. struct vnet_mcast_entry *m;
  618. for (m = vp->mcast_list; m; m = m->next) {
  619. if (!memcmp(m->addr, addr, ETH_ALEN))
  620. return m;
  621. }
  622. return NULL;
  623. }
  624. static void __update_mc_list(struct vnet *vp, struct net_device *dev)
  625. {
  626. struct netdev_hw_addr *ha;
  627. netdev_for_each_mc_addr(ha, dev) {
  628. struct vnet_mcast_entry *m;
  629. m = __vnet_mc_find(vp, ha->addr);
  630. if (m) {
  631. m->hit = 1;
  632. continue;
  633. }
  634. if (!m) {
  635. m = kzalloc(sizeof(*m), GFP_ATOMIC);
  636. if (!m)
  637. continue;
  638. memcpy(m->addr, ha->addr, ETH_ALEN);
  639. m->hit = 1;
  640. m->next = vp->mcast_list;
  641. vp->mcast_list = m;
  642. }
  643. }
  644. }
  645. static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
  646. {
  647. struct vio_net_mcast_info info;
  648. struct vnet_mcast_entry *m, **pp;
  649. int n_addrs;
  650. memset(&info, 0, sizeof(info));
  651. info.tag.type = VIO_TYPE_CTRL;
  652. info.tag.stype = VIO_SUBTYPE_INFO;
  653. info.tag.stype_env = VNET_MCAST_INFO;
  654. info.tag.sid = vio_send_sid(&port->vio);
  655. info.set = 1;
  656. n_addrs = 0;
  657. for (m = vp->mcast_list; m; m = m->next) {
  658. if (m->sent)
  659. continue;
  660. m->sent = 1;
  661. memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
  662. m->addr, ETH_ALEN);
  663. if (++n_addrs == VNET_NUM_MCAST) {
  664. info.count = n_addrs;
  665. (void) vio_ldc_send(&port->vio, &info,
  666. sizeof(info));
  667. n_addrs = 0;
  668. }
  669. }
  670. if (n_addrs) {
  671. info.count = n_addrs;
  672. (void) vio_ldc_send(&port->vio, &info, sizeof(info));
  673. }
  674. info.set = 0;
  675. n_addrs = 0;
  676. pp = &vp->mcast_list;
  677. while ((m = *pp) != NULL) {
  678. if (m->hit) {
  679. m->hit = 0;
  680. pp = &m->next;
  681. continue;
  682. }
  683. memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
  684. m->addr, ETH_ALEN);
  685. if (++n_addrs == VNET_NUM_MCAST) {
  686. info.count = n_addrs;
  687. (void) vio_ldc_send(&port->vio, &info,
  688. sizeof(info));
  689. n_addrs = 0;
  690. }
  691. *pp = m->next;
  692. kfree(m);
  693. }
  694. if (n_addrs) {
  695. info.count = n_addrs;
  696. (void) vio_ldc_send(&port->vio, &info, sizeof(info));
  697. }
  698. }
  699. static void vnet_set_rx_mode(struct net_device *dev)
  700. {
  701. struct vnet *vp = netdev_priv(dev);
  702. struct vnet_port *port;
  703. unsigned long flags;
  704. spin_lock_irqsave(&vp->lock, flags);
  705. if (!list_empty(&vp->port_list)) {
  706. port = list_entry(vp->port_list.next, struct vnet_port, list);
  707. if (port->switch_port) {
  708. __update_mc_list(vp, dev);
  709. __send_mc_list(vp, port);
  710. }
  711. }
  712. spin_unlock_irqrestore(&vp->lock, flags);
  713. }
  714. static int vnet_change_mtu(struct net_device *dev, int new_mtu)
  715. {
  716. if (new_mtu != ETH_DATA_LEN)
  717. return -EINVAL;
  718. dev->mtu = new_mtu;
  719. return 0;
  720. }
  721. static int vnet_set_mac_addr(struct net_device *dev, void *p)
  722. {
  723. return -EINVAL;
  724. }
  725. static void vnet_get_drvinfo(struct net_device *dev,
  726. struct ethtool_drvinfo *info)
  727. {
  728. strcpy(info->driver, DRV_MODULE_NAME);
  729. strcpy(info->version, DRV_MODULE_VERSION);
  730. }
  731. static u32 vnet_get_msglevel(struct net_device *dev)
  732. {
  733. struct vnet *vp = netdev_priv(dev);
  734. return vp->msg_enable;
  735. }
  736. static void vnet_set_msglevel(struct net_device *dev, u32 value)
  737. {
  738. struct vnet *vp = netdev_priv(dev);
  739. vp->msg_enable = value;
  740. }
  741. static const struct ethtool_ops vnet_ethtool_ops = {
  742. .get_drvinfo = vnet_get_drvinfo,
  743. .get_msglevel = vnet_get_msglevel,
  744. .set_msglevel = vnet_set_msglevel,
  745. .get_link = ethtool_op_get_link,
  746. };
  747. static void vnet_port_free_tx_bufs(struct vnet_port *port)
  748. {
  749. struct vio_dring_state *dr;
  750. int i;
  751. dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  752. if (dr->base) {
  753. ldc_free_exp_dring(port->vio.lp, dr->base,
  754. (dr->entry_size * dr->num_entries),
  755. dr->cookies, dr->ncookies);
  756. dr->base = NULL;
  757. dr->entry_size = 0;
  758. dr->num_entries = 0;
  759. dr->pending = 0;
  760. dr->ncookies = 0;
  761. }
  762. for (i = 0; i < VNET_TX_RING_SIZE; i++) {
  763. void *buf = port->tx_bufs[i].buf;
  764. if (!buf)
  765. continue;
  766. ldc_unmap(port->vio.lp,
  767. port->tx_bufs[i].cookies,
  768. port->tx_bufs[i].ncookies);
  769. kfree(buf);
  770. port->tx_bufs[i].buf = NULL;
  771. }
  772. }
  773. static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
  774. {
  775. struct vio_dring_state *dr;
  776. unsigned long len;
  777. int i, err, ncookies;
  778. void *dring;
  779. for (i = 0; i < VNET_TX_RING_SIZE; i++) {
  780. void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
  781. int map_len = (ETH_FRAME_LEN + 7) & ~7;
  782. err = -ENOMEM;
  783. if (!buf) {
  784. pr_err("TX buffer allocation failure\n");
  785. goto err_out;
  786. }
  787. err = -EFAULT;
  788. if ((unsigned long)buf & (8UL - 1)) {
  789. pr_err("TX buffer misaligned\n");
  790. kfree(buf);
  791. goto err_out;
  792. }
  793. err = ldc_map_single(port->vio.lp, buf, map_len,
  794. port->tx_bufs[i].cookies, 2,
  795. (LDC_MAP_SHADOW |
  796. LDC_MAP_DIRECT |
  797. LDC_MAP_RW));
  798. if (err < 0) {
  799. kfree(buf);
  800. goto err_out;
  801. }
  802. port->tx_bufs[i].buf = buf;
  803. port->tx_bufs[i].ncookies = err;
  804. }
  805. dr = &port->vio.drings[VIO_DRIVER_TX_RING];
  806. len = (VNET_TX_RING_SIZE *
  807. (sizeof(struct vio_net_desc) +
  808. (sizeof(struct ldc_trans_cookie) * 2)));
  809. ncookies = VIO_MAX_RING_COOKIES;
  810. dring = ldc_alloc_exp_dring(port->vio.lp, len,
  811. dr->cookies, &ncookies,
  812. (LDC_MAP_SHADOW |
  813. LDC_MAP_DIRECT |
  814. LDC_MAP_RW));
  815. if (IS_ERR(dring)) {
  816. err = PTR_ERR(dring);
  817. goto err_out;
  818. }
  819. dr->base = dring;
  820. dr->entry_size = (sizeof(struct vio_net_desc) +
  821. (sizeof(struct ldc_trans_cookie) * 2));
  822. dr->num_entries = VNET_TX_RING_SIZE;
  823. dr->prod = dr->cons = 0;
  824. dr->pending = VNET_TX_RING_SIZE;
  825. dr->ncookies = ncookies;
  826. return 0;
  827. err_out:
  828. vnet_port_free_tx_bufs(port);
  829. return err;
  830. }
  831. static LIST_HEAD(vnet_list);
  832. static DEFINE_MUTEX(vnet_list_mutex);
  833. static const struct net_device_ops vnet_ops = {
  834. .ndo_open = vnet_open,
  835. .ndo_stop = vnet_close,
  836. .ndo_set_multicast_list = vnet_set_rx_mode,
  837. .ndo_set_mac_address = vnet_set_mac_addr,
  838. .ndo_validate_addr = eth_validate_addr,
  839. .ndo_tx_timeout = vnet_tx_timeout,
  840. .ndo_change_mtu = vnet_change_mtu,
  841. .ndo_start_xmit = vnet_start_xmit,
  842. };
  843. static struct vnet * __devinit vnet_new(const u64 *local_mac)
  844. {
  845. struct net_device *dev;
  846. struct vnet *vp;
  847. int err, i;
  848. dev = alloc_etherdev(sizeof(*vp));
  849. if (!dev) {
  850. pr_err("Etherdev alloc failed, aborting\n");
  851. return ERR_PTR(-ENOMEM);
  852. }
  853. for (i = 0; i < ETH_ALEN; i++)
  854. dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
  855. memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
  856. vp = netdev_priv(dev);
  857. spin_lock_init(&vp->lock);
  858. vp->dev = dev;
  859. INIT_LIST_HEAD(&vp->port_list);
  860. for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
  861. INIT_HLIST_HEAD(&vp->port_hash[i]);
  862. INIT_LIST_HEAD(&vp->list);
  863. vp->local_mac = *local_mac;
  864. dev->netdev_ops = &vnet_ops;
  865. dev->ethtool_ops = &vnet_ethtool_ops;
  866. dev->watchdog_timeo = VNET_TX_TIMEOUT;
  867. err = register_netdev(dev);
  868. if (err) {
  869. pr_err("Cannot register net device, aborting\n");
  870. goto err_out_free_dev;
  871. }
  872. netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
  873. list_add(&vp->list, &vnet_list);
  874. return vp;
  875. err_out_free_dev:
  876. free_netdev(dev);
  877. return ERR_PTR(err);
  878. }
  879. static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
  880. {
  881. struct vnet *iter, *vp;
  882. mutex_lock(&vnet_list_mutex);
  883. vp = NULL;
  884. list_for_each_entry(iter, &vnet_list, list) {
  885. if (iter->local_mac == *local_mac) {
  886. vp = iter;
  887. break;
  888. }
  889. }
  890. if (!vp)
  891. vp = vnet_new(local_mac);
  892. mutex_unlock(&vnet_list_mutex);
  893. return vp;
  894. }
  895. static const char *local_mac_prop = "local-mac-address";
  896. static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
  897. u64 port_node)
  898. {
  899. const u64 *local_mac = NULL;
  900. u64 a;
  901. mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
  902. u64 target = mdesc_arc_target(hp, a);
  903. const char *name;
  904. name = mdesc_get_property(hp, target, "name", NULL);
  905. if (!name || strcmp(name, "network"))
  906. continue;
  907. local_mac = mdesc_get_property(hp, target,
  908. local_mac_prop, NULL);
  909. if (local_mac)
  910. break;
  911. }
  912. if (!local_mac)
  913. return ERR_PTR(-ENODEV);
  914. return vnet_find_or_create(local_mac);
  915. }
  916. static struct ldc_channel_config vnet_ldc_cfg = {
  917. .event = vnet_event,
  918. .mtu = 64,
  919. .mode = LDC_MODE_UNRELIABLE,
  920. };
  921. static struct vio_driver_ops vnet_vio_ops = {
  922. .send_attr = vnet_send_attr,
  923. .handle_attr = vnet_handle_attr,
  924. .handshake_complete = vnet_handshake_complete,
  925. };
  926. static void __devinit print_version(void)
  927. {
  928. printk_once(KERN_INFO "%s", version);
  929. }
  930. const char *remote_macaddr_prop = "remote-mac-address";
  931. static int __devinit vnet_port_probe(struct vio_dev *vdev,
  932. const struct vio_device_id *id)
  933. {
  934. struct mdesc_handle *hp;
  935. struct vnet_port *port;
  936. unsigned long flags;
  937. struct vnet *vp;
  938. const u64 *rmac;
  939. int len, i, err, switch_port;
  940. print_version();
  941. hp = mdesc_grab();
  942. vp = vnet_find_parent(hp, vdev->mp);
  943. if (IS_ERR(vp)) {
  944. pr_err("Cannot find port parent vnet\n");
  945. err = PTR_ERR(vp);
  946. goto err_out_put_mdesc;
  947. }
  948. rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
  949. err = -ENODEV;
  950. if (!rmac) {
  951. pr_err("Port lacks %s property\n", remote_macaddr_prop);
  952. goto err_out_put_mdesc;
  953. }
  954. port = kzalloc(sizeof(*port), GFP_KERNEL);
  955. err = -ENOMEM;
  956. if (!port) {
  957. pr_err("Cannot allocate vnet_port\n");
  958. goto err_out_put_mdesc;
  959. }
  960. for (i = 0; i < ETH_ALEN; i++)
  961. port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
  962. port->vp = vp;
  963. err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
  964. vnet_versions, ARRAY_SIZE(vnet_versions),
  965. &vnet_vio_ops, vp->dev->name);
  966. if (err)
  967. goto err_out_free_port;
  968. err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
  969. if (err)
  970. goto err_out_free_port;
  971. err = vnet_port_alloc_tx_bufs(port);
  972. if (err)
  973. goto err_out_free_ldc;
  974. INIT_HLIST_NODE(&port->hash);
  975. INIT_LIST_HEAD(&port->list);
  976. switch_port = 0;
  977. if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
  978. switch_port = 1;
  979. port->switch_port = switch_port;
  980. spin_lock_irqsave(&vp->lock, flags);
  981. if (switch_port)
  982. list_add(&port->list, &vp->port_list);
  983. else
  984. list_add_tail(&port->list, &vp->port_list);
  985. hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
  986. spin_unlock_irqrestore(&vp->lock, flags);
  987. dev_set_drvdata(&vdev->dev, port);
  988. pr_info("%s: PORT ( remote-mac %pM%s )\n",
  989. vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
  990. vio_port_up(&port->vio);
  991. mdesc_release(hp);
  992. return 0;
  993. err_out_free_ldc:
  994. vio_ldc_free(&port->vio);
  995. err_out_free_port:
  996. kfree(port);
  997. err_out_put_mdesc:
  998. mdesc_release(hp);
  999. return err;
  1000. }
  1001. static int vnet_port_remove(struct vio_dev *vdev)
  1002. {
  1003. struct vnet_port *port = dev_get_drvdata(&vdev->dev);
  1004. if (port) {
  1005. struct vnet *vp = port->vp;
  1006. unsigned long flags;
  1007. del_timer_sync(&port->vio.timer);
  1008. spin_lock_irqsave(&vp->lock, flags);
  1009. list_del(&port->list);
  1010. hlist_del(&port->hash);
  1011. spin_unlock_irqrestore(&vp->lock, flags);
  1012. vnet_port_free_tx_bufs(port);
  1013. vio_ldc_free(&port->vio);
  1014. dev_set_drvdata(&vdev->dev, NULL);
  1015. kfree(port);
  1016. }
  1017. return 0;
  1018. }
  1019. static const struct vio_device_id vnet_port_match[] = {
  1020. {
  1021. .type = "vnet-port",
  1022. },
  1023. {},
  1024. };
  1025. MODULE_DEVICE_TABLE(vio, vnet_port_match);
  1026. static struct vio_driver vnet_port_driver = {
  1027. .id_table = vnet_port_match,
  1028. .probe = vnet_port_probe,
  1029. .remove = vnet_port_remove,
  1030. .driver = {
  1031. .name = "vnet_port",
  1032. .owner = THIS_MODULE,
  1033. }
  1034. };
  1035. static int __init vnet_init(void)
  1036. {
  1037. return vio_register_driver(&vnet_port_driver);
  1038. }
  1039. static void __exit vnet_exit(void)
  1040. {
  1041. vio_unregister_driver(&vnet_port_driver);
  1042. }
  1043. module_init(vnet_init);
  1044. module_exit(vnet_exit);