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1/*
2 * Copyright (C) 2017 - Cambridge Greys Limited
3 * Copyright (C) 2011 - 2014 Cisco Systems Inc
4 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
6 * James Leu (jleu@mindspring.net).
7 * Copyright (C) 2001 by various other people who didn't put their name here.
8 * Licensed under the GPL.
9 */
10
11#include <linux/version.h>
12#include <linux/bootmem.h>
13#include <linux/etherdevice.h>
14#include <linux/ethtool.h>
15#include <linux/inetdevice.h>
16#include <linux/init.h>
17#include <linux/list.h>
18#include <linux/netdevice.h>
19#include <linux/platform_device.h>
20#include <linux/rtnetlink.h>
21#include <linux/skbuff.h>
22#include <linux/slab.h>
23#include <linux/interrupt.h>
24#include <init.h>
25#include <irq_kern.h>
26#include <irq_user.h>
27#include <net_kern.h>
28#include <os.h>
29#include "mconsole_kern.h"
30#include "vector_user.h"
31#include "vector_kern.h"
32
33/*
34 * Adapted from network devices with the following major changes:
35 * All transports are static - simplifies the code significantly
36 * Multiple FDs/IRQs per device
37 * Vector IO optionally used for read/write, falling back to legacy
38 * based on configuration and/or availability
39 * Configuration is no longer positional - L2TPv3 and GRE require up to
40 * 10 parameters, passing this as positional is not fit for purpose.
41 * Only socket transports are supported
42 */
43
44
45#define DRIVER_NAME "uml-vector"
46#define DRIVER_VERSION "01"
47struct vector_cmd_line_arg {
48 struct list_head list;
49 int unit;
50 char *arguments;
51};
52
53struct vector_device {
54 struct list_head list;
55 struct net_device *dev;
56 struct platform_device pdev;
57 int unit;
58 int opened;
59};
60
61static LIST_HEAD(vec_cmd_line);
62
63static DEFINE_SPINLOCK(vector_devices_lock);
64static LIST_HEAD(vector_devices);
65
66static int driver_registered;
67
68static void vector_eth_configure(int n, struct arglist *def);
69
70/* Argument accessors to set variables (and/or set default values)
71 * mtu, buffer sizing, default headroom, etc
72 */
73
74#define DEFAULT_HEADROOM 2
75#define SAFETY_MARGIN 32
76#define DEFAULT_VECTOR_SIZE 64
77#define TX_SMALL_PACKET 128
78#define MAX_IOV_SIZE (MAX_SKB_FRAGS + 1)
79
80static const struct {
81 const char string[ETH_GSTRING_LEN];
82} ethtool_stats_keys[] = {
83 { "rx_queue_max" },
84 { "rx_queue_running_average" },
85 { "tx_queue_max" },
86 { "tx_queue_running_average" },
87 { "rx_encaps_errors" },
88 { "tx_timeout_count" },
89 { "tx_restart_queue" },
90 { "tx_kicks" },
91 { "tx_flow_control_xon" },
92 { "tx_flow_control_xoff" },
93 { "rx_csum_offload_good" },
94 { "rx_csum_offload_errors"},
95 { "sg_ok"},
96 { "sg_linearized"},
97};
98
99#define VECTOR_NUM_STATS ARRAY_SIZE(ethtool_stats_keys)
100
101static void vector_reset_stats(struct vector_private *vp)
102{
103 vp->estats.rx_queue_max = 0;
104 vp->estats.rx_queue_running_average = 0;
105 vp->estats.tx_queue_max = 0;
106 vp->estats.tx_queue_running_average = 0;
107 vp->estats.rx_encaps_errors = 0;
108 vp->estats.tx_timeout_count = 0;
109 vp->estats.tx_restart_queue = 0;
110 vp->estats.tx_kicks = 0;
111 vp->estats.tx_flow_control_xon = 0;
112 vp->estats.tx_flow_control_xoff = 0;
113 vp->estats.sg_ok = 0;
114 vp->estats.sg_linearized = 0;
115}
116
117static int get_mtu(struct arglist *def)
118{
119 char *mtu = uml_vector_fetch_arg(def, "mtu");
120 long result;
121
122 if (mtu != NULL) {
123 if (kstrtoul(mtu, 10, &result) == 0)
124 return result;
125 }
126 return ETH_MAX_PACKET;
127}
128
129static int get_depth(struct arglist *def)
130{
131 char *mtu = uml_vector_fetch_arg(def, "depth");
132 long result;
133
134 if (mtu != NULL) {
135 if (kstrtoul(mtu, 10, &result) == 0)
136 return result;
137 }
138 return DEFAULT_VECTOR_SIZE;
139}
140
141static int get_headroom(struct arglist *def)
142{
143 char *mtu = uml_vector_fetch_arg(def, "headroom");
144 long result;
145
146 if (mtu != NULL) {
147 if (kstrtoul(mtu, 10, &result) == 0)
148 return result;
149 }
150 return DEFAULT_HEADROOM;
151}
152
153static int get_req_size(struct arglist *def)
154{
155 char *gro = uml_vector_fetch_arg(def, "gro");
156 long result;
157
158 if (gro != NULL) {
159 if (kstrtoul(gro, 10, &result) == 0) {
160 if (result > 0)
161 return 65536;
162 }
163 }
164 return get_mtu(def) + ETH_HEADER_OTHER +
165 get_headroom(def) + SAFETY_MARGIN;
166}
167
168
169static int get_transport_options(struct arglist *def)
170{
171 char *transport = uml_vector_fetch_arg(def, "transport");
172 char *vector = uml_vector_fetch_arg(def, "vec");
173
174 int vec_rx = VECTOR_RX;
175 int vec_tx = VECTOR_TX;
176 long parsed;
177
178 if (vector != NULL) {
179 if (kstrtoul(vector, 10, &parsed) == 0) {
180 if (parsed == 0) {
181 vec_rx = 0;
182 vec_tx = 0;
183 }
184 }
185 }
186
187
188 if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
189 return (vec_rx | VECTOR_BPF);
190 if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
191 return (vec_rx | vec_tx);
192 return (vec_rx | vec_tx);
193}
194
195
196/* A mini-buffer for packet drop read
197 * All of our supported transports are datagram oriented and we always
198 * read using recvmsg or recvmmsg. If we pass a buffer which is smaller
199 * than the packet size it still counts as full packet read and will
200 * clean the incoming stream to keep sigio/epoll happy
201 */
202
203#define DROP_BUFFER_SIZE 32
204
205static char *drop_buffer;
206
207/* Array backed queues optimized for bulk enqueue/dequeue and
208 * 1:N (small values of N) or 1:1 enqueuer/dequeuer ratios.
209 * For more details and full design rationale see
210 * http://foswiki.cambridgegreys.com/Main/EatYourTailAndEnjoyIt
211 */
212
213
214/*
215 * Advance the mmsg queue head by n = advance. Resets the queue to
216 * maximum enqueue/dequeue-at-once capacity if possible. Called by
217 * dequeuers. Caller must hold the head_lock!
218 */
219
220static int vector_advancehead(struct vector_queue *qi, int advance)
221{
222 int queue_depth;
223
224 qi->head =
225 (qi->head + advance)
226 % qi->max_depth;
227
228
229 spin_lock(&qi->tail_lock);
230 qi->queue_depth -= advance;
231
232 /* we are at 0, use this to
233 * reset head and tail so we can use max size vectors
234 */
235
236 if (qi->queue_depth == 0) {
237 qi->head = 0;
238 qi->tail = 0;
239 }
240 queue_depth = qi->queue_depth;
241 spin_unlock(&qi->tail_lock);
242 return queue_depth;
243}
244
245/* Advance the queue tail by n = advance.
246 * This is called by enqueuers which should hold the
247 * head lock already
248 */
249
250static int vector_advancetail(struct vector_queue *qi, int advance)
251{
252 int queue_depth;
253
254 qi->tail =
255 (qi->tail + advance)
256 % qi->max_depth;
257 spin_lock(&qi->head_lock);
258 qi->queue_depth += advance;
259 queue_depth = qi->queue_depth;
260 spin_unlock(&qi->head_lock);
261 return queue_depth;
262}
263
264static int prep_msg(struct vector_private *vp,
265 struct sk_buff *skb,
266 struct iovec *iov)
267{
268 int iov_index = 0;
269 int nr_frags, frag;
270 skb_frag_t *skb_frag;
271
272 nr_frags = skb_shinfo(skb)->nr_frags;
273 if (nr_frags > MAX_IOV_SIZE) {
274 if (skb_linearize(skb) != 0)
275 goto drop;
276 }
277 if (vp->header_size > 0) {
278 iov[iov_index].iov_len = vp->header_size;
279 vp->form_header(iov[iov_index].iov_base, skb, vp);
280 iov_index++;
281 }
282 iov[iov_index].iov_base = skb->data;
283 if (nr_frags > 0) {
284 iov[iov_index].iov_len = skb->len - skb->data_len;
285 vp->estats.sg_ok++;
286 } else
287 iov[iov_index].iov_len = skb->len;
288 iov_index++;
289 for (frag = 0; frag < nr_frags; frag++) {
290 skb_frag = &skb_shinfo(skb)->frags[frag];
291 iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
292 iov[iov_index].iov_len = skb_frag_size(skb_frag);
293 iov_index++;
294 }
295 return iov_index;
296drop:
297 return -1;
298}
299/*
300 * Generic vector enqueue with support for forming headers using transport
301 * specific callback. Allows GRE, L2TPv3, RAW and other transports
302 * to use a common enqueue procedure in vector mode
303 */
304
305static int vector_enqueue(struct vector_queue *qi, struct sk_buff *skb)
306{
307 struct vector_private *vp = netdev_priv(qi->dev);
308 int queue_depth;
309 int packet_len;
310 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
311 int iov_count;
312
313 spin_lock(&qi->tail_lock);
314 spin_lock(&qi->head_lock);
315 queue_depth = qi->queue_depth;
316 spin_unlock(&qi->head_lock);
317
318 if (skb)
319 packet_len = skb->len;
320
321 if (queue_depth < qi->max_depth) {
322
323 *(qi->skbuff_vector + qi->tail) = skb;
324 mmsg_vector += qi->tail;
325 iov_count = prep_msg(
326 vp,
327 skb,
328 mmsg_vector->msg_hdr.msg_iov
329 );
330 if (iov_count < 1)
331 goto drop;
332 mmsg_vector->msg_hdr.msg_iovlen = iov_count;
333 mmsg_vector->msg_hdr.msg_name = vp->fds->remote_addr;
334 mmsg_vector->msg_hdr.msg_namelen = vp->fds->remote_addr_size;
335 queue_depth = vector_advancetail(qi, 1);
336 } else
337 goto drop;
338 spin_unlock(&qi->tail_lock);
339 return queue_depth;
340drop:
341 qi->dev->stats.tx_dropped++;
342 if (skb != NULL) {
343 packet_len = skb->len;
344 dev_consume_skb_any(skb);
345 netdev_completed_queue(qi->dev, 1, packet_len);
346 }
347 spin_unlock(&qi->tail_lock);
348 return queue_depth;
349}
350
351static int consume_vector_skbs(struct vector_queue *qi, int count)
352{
353 struct sk_buff *skb;
354 int skb_index;
355 int bytes_compl = 0;
356
357 for (skb_index = qi->head; skb_index < qi->head + count; skb_index++) {
358 skb = *(qi->skbuff_vector + skb_index);
359 /* mark as empty to ensure correct destruction if
360 * needed
361 */
362 bytes_compl += skb->len;
363 *(qi->skbuff_vector + skb_index) = NULL;
364 dev_consume_skb_any(skb);
365 }
366 qi->dev->stats.tx_bytes += bytes_compl;
367 qi->dev->stats.tx_packets += count;
368 netdev_completed_queue(qi->dev, count, bytes_compl);
369 return vector_advancehead(qi, count);
370}
371
372/*
373 * Generic vector deque via sendmmsg with support for forming headers
374 * using transport specific callback. Allows GRE, L2TPv3, RAW and
375 * other transports to use a common dequeue procedure in vector mode
376 */
377
378
379static int vector_send(struct vector_queue *qi)
380{
381 struct vector_private *vp = netdev_priv(qi->dev);
382 struct mmsghdr *send_from;
383 int result = 0, send_len, queue_depth = qi->max_depth;
384
385 if (spin_trylock(&qi->head_lock)) {
386 if (spin_trylock(&qi->tail_lock)) {
387 /* update queue_depth to current value */
388 queue_depth = qi->queue_depth;
389 spin_unlock(&qi->tail_lock);
390 while (queue_depth > 0) {
391 /* Calculate the start of the vector */
392 send_len = queue_depth;
393 send_from = qi->mmsg_vector;
394 send_from += qi->head;
395 /* Adjust vector size if wraparound */
396 if (send_len + qi->head > qi->max_depth)
397 send_len = qi->max_depth - qi->head;
398 /* Try to TX as many packets as possible */
399 if (send_len > 0) {
400 result = uml_vector_sendmmsg(
401 vp->fds->tx_fd,
402 send_from,
403 send_len,
404 0
405 );
406 vp->in_write_poll =
407 (result != send_len);
408 }
409 /* For some of the sendmmsg error scenarios
410 * we may end being unsure in the TX success
411 * for all packets. It is safer to declare
412 * them all TX-ed and blame the network.
413 */
414 if (result < 0) {
415 if (net_ratelimit())
416 netdev_err(vp->dev, "sendmmsg err=%i\n",
417 result);
418 result = send_len;
419 }
420 if (result > 0) {
421 queue_depth =
422 consume_vector_skbs(qi, result);
423 /* This is equivalent to an TX IRQ.
424 * Restart the upper layers to feed us
425 * more packets.
426 */
427 if (result > vp->estats.tx_queue_max)
428 vp->estats.tx_queue_max = result;
429 vp->estats.tx_queue_running_average =
430 (vp->estats.tx_queue_running_average + result) >> 1;
431 }
432 netif_trans_update(qi->dev);
433 netif_wake_queue(qi->dev);
434 /* if TX is busy, break out of the send loop,
435 * poll write IRQ will reschedule xmit for us
436 */
437 if (result != send_len) {
438 vp->estats.tx_restart_queue++;
439 break;
440 }
441 }
442 }
443 spin_unlock(&qi->head_lock);
444 } else {
445 tasklet_schedule(&vp->tx_poll);
446 }
447 return queue_depth;
448}
449
450/* Queue destructor. Deliberately stateless so we can use
451 * it in queue cleanup if initialization fails.
452 */
453
454static void destroy_queue(struct vector_queue *qi)
455{
456 int i;
457 struct iovec *iov;
458 struct vector_private *vp = netdev_priv(qi->dev);
459 struct mmsghdr *mmsg_vector;
460
461 if (qi == NULL)
462 return;
463 /* deallocate any skbuffs - we rely on any unused to be
464 * set to NULL.
465 */
466 if (qi->skbuff_vector != NULL) {
467 for (i = 0; i < qi->max_depth; i++) {
468 if (*(qi->skbuff_vector + i) != NULL)
469 dev_kfree_skb_any(*(qi->skbuff_vector + i));
470 }
471 kfree(qi->skbuff_vector);
472 }
473 /* deallocate matching IOV structures including header buffs */
474 if (qi->mmsg_vector != NULL) {
475 mmsg_vector = qi->mmsg_vector;
476 for (i = 0; i < qi->max_depth; i++) {
477 iov = mmsg_vector->msg_hdr.msg_iov;
478 if (iov != NULL) {
479 if ((vp->header_size > 0) &&
480 (iov->iov_base != NULL))
481 kfree(iov->iov_base);
482 kfree(iov);
483 }
484 mmsg_vector++;
485 }
486 kfree(qi->mmsg_vector);
487 }
488 kfree(qi);
489}
490
491/*
492 * Queue constructor. Create a queue with a given side.
493 */
494static struct vector_queue *create_queue(
495 struct vector_private *vp,
496 int max_size,
497 int header_size,
498 int num_extra_frags)
499{
500 struct vector_queue *result;
501 int i;
502 struct iovec *iov;
503 struct mmsghdr *mmsg_vector;
504
505 result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
506 if (result == NULL)
507 goto out_fail;
508 result->max_depth = max_size;
509 result->dev = vp->dev;
510 result->mmsg_vector = kmalloc(
511 (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
512 result->skbuff_vector = kmalloc(
513 (sizeof(void *) * max_size), GFP_KERNEL);
514 if (result->mmsg_vector == NULL || result->skbuff_vector == NULL)
515 goto out_fail;
516
517 mmsg_vector = result->mmsg_vector;
518 for (i = 0; i < max_size; i++) {
519 /* Clear all pointers - we use non-NULL as marking on
520 * what to free on destruction
521 */
522 *(result->skbuff_vector + i) = NULL;
523 mmsg_vector->msg_hdr.msg_iov = NULL;
524 mmsg_vector++;
525 }
526 mmsg_vector = result->mmsg_vector;
527 result->max_iov_frags = num_extra_frags;
528 for (i = 0; i < max_size; i++) {
529 if (vp->header_size > 0)
530 iov = kmalloc(
531 sizeof(struct iovec) * (3 + num_extra_frags),
532 GFP_KERNEL
533 );
534 else
535 iov = kmalloc(
536 sizeof(struct iovec) * (2 + num_extra_frags),
537 GFP_KERNEL
538 );
539 if (iov == NULL)
540 goto out_fail;
541 mmsg_vector->msg_hdr.msg_iov = iov;
542 mmsg_vector->msg_hdr.msg_iovlen = 1;
543 mmsg_vector->msg_hdr.msg_control = NULL;
544 mmsg_vector->msg_hdr.msg_controllen = 0;
545 mmsg_vector->msg_hdr.msg_flags = MSG_DONTWAIT;
546 mmsg_vector->msg_hdr.msg_name = NULL;
547 mmsg_vector->msg_hdr.msg_namelen = 0;
548 if (vp->header_size > 0) {
549 iov->iov_base = kmalloc(header_size, GFP_KERNEL);
550 if (iov->iov_base == NULL)
551 goto out_fail;
552 iov->iov_len = header_size;
553 mmsg_vector->msg_hdr.msg_iovlen = 2;
554 iov++;
555 }
556 iov->iov_base = NULL;
557 iov->iov_len = 0;
558 mmsg_vector++;
559 }
560 spin_lock_init(&result->head_lock);
561 spin_lock_init(&result->tail_lock);
562 result->queue_depth = 0;
563 result->head = 0;
564 result->tail = 0;
565 return result;
566out_fail:
567 destroy_queue(result);
568 return NULL;
569}
570
571/*
572 * We do not use the RX queue as a proper wraparound queue for now
573 * This is not necessary because the consumption via netif_rx()
574 * happens in-line. While we can try using the return code of
575 * netif_rx() for flow control there are no drivers doing this today.
576 * For this RX specific use we ignore the tail/head locks and
577 * just read into a prepared queue filled with skbuffs.
578 */
579
580static struct sk_buff *prep_skb(
581 struct vector_private *vp,
582 struct user_msghdr *msg)
583{
584 int linear = vp->max_packet + vp->headroom + SAFETY_MARGIN;
585 struct sk_buff *result;
586 int iov_index = 0, len;
587 struct iovec *iov = msg->msg_iov;
588 int err, nr_frags, frag;
589 skb_frag_t *skb_frag;
590
591 if (vp->req_size <= linear)
592 len = linear;
593 else
594 len = vp->req_size;
595 result = alloc_skb_with_frags(
596 linear,
597 len - vp->max_packet,
598 3,
599 &err,
600 GFP_ATOMIC
601 );
602 if (vp->header_size > 0)
603 iov_index++;
604 if (result == NULL) {
605 iov[iov_index].iov_base = NULL;
606 iov[iov_index].iov_len = 0;
607 goto done;
608 }
609 skb_reserve(result, vp->headroom);
610 result->dev = vp->dev;
611 skb_put(result, vp->max_packet);
612 result->data_len = len - vp->max_packet;
613 result->len += len - vp->max_packet;
614 skb_reset_mac_header(result);
615 result->ip_summed = CHECKSUM_NONE;
616 iov[iov_index].iov_base = result->data;
617 iov[iov_index].iov_len = vp->max_packet;
618 iov_index++;
619
620 nr_frags = skb_shinfo(result)->nr_frags;
621 for (frag = 0; frag < nr_frags; frag++) {
622 skb_frag = &skb_shinfo(result)->frags[frag];
623 iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
624 if (iov[iov_index].iov_base != NULL)
625 iov[iov_index].iov_len = skb_frag_size(skb_frag);
626 else
627 iov[iov_index].iov_len = 0;
628 iov_index++;
629 }
630done:
631 msg->msg_iovlen = iov_index;
632 return result;
633}
634
635
636/* Prepare queue for recvmmsg one-shot rx - fill with fresh sk_buffs*/
637
638static void prep_queue_for_rx(struct vector_queue *qi)
639{
640 struct vector_private *vp = netdev_priv(qi->dev);
641 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
642 void **skbuff_vector = qi->skbuff_vector;
643 int i;
644
645 if (qi->queue_depth == 0)
646 return;
647 for (i = 0; i < qi->queue_depth; i++) {
648 /* it is OK if allocation fails - recvmmsg with NULL data in
649 * iov argument still performs an RX, just drops the packet
650 * This allows us stop faffing around with a "drop buffer"
651 */
652
653 *skbuff_vector = prep_skb(vp, &mmsg_vector->msg_hdr);
654 skbuff_vector++;
655 mmsg_vector++;
656 }
657 qi->queue_depth = 0;
658}
659
660static struct vector_device *find_device(int n)
661{
662 struct vector_device *device;
663 struct list_head *ele;
664
665 spin_lock(&vector_devices_lock);
666 list_for_each(ele, &vector_devices) {
667 device = list_entry(ele, struct vector_device, list);
668 if (device->unit == n)
669 goto out;
670 }
671 device = NULL;
672 out:
673 spin_unlock(&vector_devices_lock);
674 return device;
675}
676
677static int vector_parse(char *str, int *index_out, char **str_out,
678 char **error_out)
679{
680 int n, len, err;
681 char *start = str;
682
683 len = strlen(str);
684
685 while ((*str != ':') && (strlen(str) > 1))
686 str++;
687 if (*str != ':') {
688 *error_out = "Expected ':' after device number";
689 return -EINVAL;
690 }
691 *str = '\0';
692
693 err = kstrtouint(start, 0, &n);
694 if (err < 0) {
695 *error_out = "Bad device number";
696 return err;
697 }
698
699 str++;
700 if (find_device(n)) {
701 *error_out = "Device already configured";
702 return -EINVAL;
703 }
704
705 *index_out = n;
706 *str_out = str;
707 return 0;
708}
709
710static int vector_config(char *str, char **error_out)
711{
712 int err, n;
713 char *params;
714 struct arglist *parsed;
715
716 err = vector_parse(str, &n, ¶ms, error_out);
717 if (err != 0)
718 return err;
719
720 /* This string is broken up and the pieces used by the underlying
721 * driver. We should copy it to make sure things do not go wrong
722 * later.
723 */
724
725 params = kstrdup(params, GFP_KERNEL);
726 if (params == NULL) {
727 *error_out = "vector_config failed to strdup string";
728 return -ENOMEM;
729 }
730
731 parsed = uml_parse_vector_ifspec(params);
732
733 if (parsed == NULL) {
734 *error_out = "vector_config failed to parse parameters";
735 return -EINVAL;
736 }
737
738 vector_eth_configure(n, parsed);
739 return 0;
740}
741
742static int vector_id(char **str, int *start_out, int *end_out)
743{
744 char *end;
745 int n;
746
747 n = simple_strtoul(*str, &end, 0);
748 if ((*end != '\0') || (end == *str))
749 return -1;
750
751 *start_out = n;
752 *end_out = n;
753 *str = end;
754 return n;
755}
756
757static int vector_remove(int n, char **error_out)
758{
759 struct vector_device *vec_d;
760 struct net_device *dev;
761 struct vector_private *vp;
762
763 vec_d = find_device(n);
764 if (vec_d == NULL)
765 return -ENODEV;
766 dev = vec_d->dev;
767 vp = netdev_priv(dev);
768 if (vp->fds != NULL)
769 return -EBUSY;
770 unregister_netdev(dev);
771 platform_device_unregister(&vec_d->pdev);
772 return 0;
773}
774
775/*
776 * There is no shared per-transport initialization code, so
777 * we will just initialize each interface one by one and
778 * add them to a list
779 */
780
781static struct platform_driver uml_net_driver = {
782 .driver = {
783 .name = DRIVER_NAME,
784 },
785};
786
787
788static void vector_device_release(struct device *dev)
789{
790 struct vector_device *device = dev_get_drvdata(dev);
791 struct net_device *netdev = device->dev;
792
793 list_del(&device->list);
794 kfree(device);
795 free_netdev(netdev);
796}
797
798/* Bog standard recv using recvmsg - not used normally unless the user
799 * explicitly specifies not to use recvmmsg vector RX.
800 */
801
802static int vector_legacy_rx(struct vector_private *vp)
803{
804 int pkt_len;
805 struct user_msghdr hdr;
806 struct iovec iov[2 + MAX_IOV_SIZE]; /* header + data use case only */
807 int iovpos = 0;
808 struct sk_buff *skb;
809 int header_check;
810
811 hdr.msg_name = NULL;
812 hdr.msg_namelen = 0;
813 hdr.msg_iov = (struct iovec *) &iov;
814 hdr.msg_control = NULL;
815 hdr.msg_controllen = 0;
816 hdr.msg_flags = 0;
817
818 if (vp->header_size > 0) {
819 iov[0].iov_base = vp->header_rxbuffer;
820 iov[0].iov_len = vp->header_size;
821 }
822
823 skb = prep_skb(vp, &hdr);
824
825 if (skb == NULL) {
826 /* Read a packet into drop_buffer and don't do
827 * anything with it.
828 */
829 iov[iovpos].iov_base = drop_buffer;
830 iov[iovpos].iov_len = DROP_BUFFER_SIZE;
831 hdr.msg_iovlen = 1;
832 vp->dev->stats.rx_dropped++;
833 }
834
835 pkt_len = uml_vector_recvmsg(vp->fds->rx_fd, &hdr, 0);
836
837 if (skb != NULL) {
838 if (pkt_len > vp->header_size) {
839 if (vp->header_size > 0) {
840 header_check = vp->verify_header(
841 vp->header_rxbuffer, skb, vp);
842 if (header_check < 0) {
843 dev_kfree_skb_irq(skb);
844 vp->dev->stats.rx_dropped++;
845 vp->estats.rx_encaps_errors++;
846 return 0;
847 }
848 if (header_check > 0) {
849 vp->estats.rx_csum_offload_good++;
850 skb->ip_summed = CHECKSUM_UNNECESSARY;
851 }
852 }
853 pskb_trim(skb, pkt_len - vp->rx_header_size);
854 skb->protocol = eth_type_trans(skb, skb->dev);
855 vp->dev->stats.rx_bytes += skb->len;
856 vp->dev->stats.rx_packets++;
857 netif_rx(skb);
858 } else {
859 dev_kfree_skb_irq(skb);
860 }
861 }
862 return pkt_len;
863}
864
865/*
866 * Packet at a time TX which falls back to vector TX if the
867 * underlying transport is busy.
868 */
869
870
871
872static int writev_tx(struct vector_private *vp, struct sk_buff *skb)
873{
874 struct iovec iov[3 + MAX_IOV_SIZE];
875 int iov_count, pkt_len = 0;
876
877 iov[0].iov_base = vp->header_txbuffer;
878 iov_count = prep_msg(vp, skb, (struct iovec *) &iov);
879
880 if (iov_count < 1)
881 goto drop;
882 pkt_len = uml_vector_writev(
883 vp->fds->tx_fd,
884 (struct iovec *) &iov,
885 iov_count
886 );
887
888 netif_trans_update(vp->dev);
889 netif_wake_queue(vp->dev);
890
891 if (pkt_len > 0) {
892 vp->dev->stats.tx_bytes += skb->len;
893 vp->dev->stats.tx_packets++;
894 } else {
895 vp->dev->stats.tx_dropped++;
896 }
897 consume_skb(skb);
898 return pkt_len;
899drop:
900 vp->dev->stats.tx_dropped++;
901 consume_skb(skb);
902 return pkt_len;
903}
904
905/*
906 * Receive as many messages as we can in one call using the special
907 * mmsg vector matched to an skb vector which we prepared earlier.
908 */
909
910static int vector_mmsg_rx(struct vector_private *vp)
911{
912 int packet_count, i;
913 struct vector_queue *qi = vp->rx_queue;
914 struct sk_buff *skb;
915 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
916 void **skbuff_vector = qi->skbuff_vector;
917 int header_check;
918
919 /* Refresh the vector and make sure it is with new skbs and the
920 * iovs are updated to point to them.
921 */
922
923 prep_queue_for_rx(qi);
924
925 /* Fire the Lazy Gun - get as many packets as we can in one go. */
926
927 packet_count = uml_vector_recvmmsg(
928 vp->fds->rx_fd, qi->mmsg_vector, qi->max_depth, 0);
929
930 if (packet_count <= 0)
931 return packet_count;
932
933 /* We treat packet processing as enqueue, buffer refresh as dequeue
934 * The queue_depth tells us how many buffers have been used and how
935 * many do we need to prep the next time prep_queue_for_rx() is called.
936 */
937
938 qi->queue_depth = packet_count;
939
940 for (i = 0; i < packet_count; i++) {
941 skb = (*skbuff_vector);
942 if (mmsg_vector->msg_len > vp->header_size) {
943 if (vp->header_size > 0) {
944 header_check = vp->verify_header(
945 mmsg_vector->msg_hdr.msg_iov->iov_base,
946 skb,
947 vp
948 );
949 if (header_check < 0) {
950 /* Overlay header failed to verify - discard.
951 * We can actually keep this skb and reuse it,
952 * but that will make the prep logic too
953 * complex.
954 */
955 dev_kfree_skb_irq(skb);
956 vp->estats.rx_encaps_errors++;
957 continue;
958 }
959 if (header_check > 0) {
960 vp->estats.rx_csum_offload_good++;
961 skb->ip_summed = CHECKSUM_UNNECESSARY;
962 }
963 }
964 pskb_trim(skb,
965 mmsg_vector->msg_len - vp->rx_header_size);
966 skb->protocol = eth_type_trans(skb, skb->dev);
967 /*
968 * We do not need to lock on updating stats here
969 * The interrupt loop is non-reentrant.
970 */
971 vp->dev->stats.rx_bytes += skb->len;
972 vp->dev->stats.rx_packets++;
973 netif_rx(skb);
974 } else {
975 /* Overlay header too short to do anything - discard.
976 * We can actually keep this skb and reuse it,
977 * but that will make the prep logic too complex.
978 */
979 if (skb != NULL)
980 dev_kfree_skb_irq(skb);
981 }
982 (*skbuff_vector) = NULL;
983 /* Move to the next buffer element */
984 mmsg_vector++;
985 skbuff_vector++;
986 }
987 if (packet_count > 0) {
988 if (vp->estats.rx_queue_max < packet_count)
989 vp->estats.rx_queue_max = packet_count;
990 vp->estats.rx_queue_running_average =
991 (vp->estats.rx_queue_running_average + packet_count) >> 1;
992 }
993 return packet_count;
994}
995
996static void vector_rx(struct vector_private *vp)
997{
998 int err;
999
1000 if ((vp->options & VECTOR_RX) > 0)
1001 while ((err = vector_mmsg_rx(vp)) > 0)
1002 ;
1003 else
1004 while ((err = vector_legacy_rx(vp)) > 0)
1005 ;
1006 if ((err != 0) && net_ratelimit())
1007 netdev_err(vp->dev, "vector_rx: error(%d)\n", err);
1008}
1009
1010static int vector_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
1011{
1012 struct vector_private *vp = netdev_priv(dev);
1013 int queue_depth = 0;
1014
1015 if ((vp->options & VECTOR_TX) == 0) {
1016 writev_tx(vp, skb);
1017 return NETDEV_TX_OK;
1018 }
1019
1020 /* We do BQL only in the vector path, no point doing it in
1021 * packet at a time mode as there is no device queue
1022 */
1023
1024 netdev_sent_queue(vp->dev, skb->len);
1025 queue_depth = vector_enqueue(vp->tx_queue, skb);
1026
1027 /* if the device queue is full, stop the upper layers and
1028 * flush it.
1029 */
1030
1031 if (queue_depth >= vp->tx_queue->max_depth - 1) {
1032 vp->estats.tx_kicks++;
1033 netif_stop_queue(dev);
1034 vector_send(vp->tx_queue);
1035 return NETDEV_TX_OK;
1036 }
1037 if (skb->xmit_more) {
1038 mod_timer(&vp->tl, vp->coalesce);
1039 return NETDEV_TX_OK;
1040 }
1041 if (skb->len < TX_SMALL_PACKET) {
1042 vp->estats.tx_kicks++;
1043 vector_send(vp->tx_queue);
1044 } else
1045 tasklet_schedule(&vp->tx_poll);
1046 return NETDEV_TX_OK;
1047}
1048
1049static irqreturn_t vector_rx_interrupt(int irq, void *dev_id)
1050{
1051 struct net_device *dev = dev_id;
1052 struct vector_private *vp = netdev_priv(dev);
1053
1054 if (!netif_running(dev))
1055 return IRQ_NONE;
1056 vector_rx(vp);
1057 return IRQ_HANDLED;
1058
1059}
1060
1061static irqreturn_t vector_tx_interrupt(int irq, void *dev_id)
1062{
1063 struct net_device *dev = dev_id;
1064 struct vector_private *vp = netdev_priv(dev);
1065
1066 if (!netif_running(dev))
1067 return IRQ_NONE;
1068 /* We need to pay attention to it only if we got
1069 * -EAGAIN or -ENOBUFFS from sendmmsg. Otherwise
1070 * we ignore it. In the future, it may be worth
1071 * it to improve the IRQ controller a bit to make
1072 * tweaking the IRQ mask less costly
1073 */
1074
1075 if (vp->in_write_poll)
1076 tasklet_schedule(&vp->tx_poll);
1077 return IRQ_HANDLED;
1078
1079}
1080
1081static int irq_rr;
1082
1083static int vector_net_close(struct net_device *dev)
1084{
1085 struct vector_private *vp = netdev_priv(dev);
1086 unsigned long flags;
1087
1088 netif_stop_queue(dev);
1089 del_timer(&vp->tl);
1090
1091 if (vp->fds == NULL)
1092 return 0;
1093
1094 /* Disable and free all IRQS */
1095 if (vp->rx_irq > 0) {
1096 um_free_irq(vp->rx_irq, dev);
1097 vp->rx_irq = 0;
1098 }
1099 if (vp->tx_irq > 0) {
1100 um_free_irq(vp->tx_irq, dev);
1101 vp->tx_irq = 0;
1102 }
1103 tasklet_kill(&vp->tx_poll);
1104 if (vp->fds->rx_fd > 0) {
1105 os_close_file(vp->fds->rx_fd);
1106 vp->fds->rx_fd = -1;
1107 }
1108 if (vp->fds->tx_fd > 0) {
1109 os_close_file(vp->fds->tx_fd);
1110 vp->fds->tx_fd = -1;
1111 }
1112 if (vp->bpf != NULL)
1113 kfree(vp->bpf);
1114 if (vp->fds->remote_addr != NULL)
1115 kfree(vp->fds->remote_addr);
1116 if (vp->transport_data != NULL)
1117 kfree(vp->transport_data);
1118 if (vp->header_rxbuffer != NULL)
1119 kfree(vp->header_rxbuffer);
1120 if (vp->header_txbuffer != NULL)
1121 kfree(vp->header_txbuffer);
1122 if (vp->rx_queue != NULL)
1123 destroy_queue(vp->rx_queue);
1124 if (vp->tx_queue != NULL)
1125 destroy_queue(vp->tx_queue);
1126 kfree(vp->fds);
1127 vp->fds = NULL;
1128 spin_lock_irqsave(&vp->lock, flags);
1129 vp->opened = false;
1130 spin_unlock_irqrestore(&vp->lock, flags);
1131 return 0;
1132}
1133
1134/* TX tasklet */
1135
1136static void vector_tx_poll(unsigned long data)
1137{
1138 struct vector_private *vp = (struct vector_private *)data;
1139
1140 vp->estats.tx_kicks++;
1141 vector_send(vp->tx_queue);
1142}
1143static void vector_reset_tx(struct work_struct *work)
1144{
1145 struct vector_private *vp =
1146 container_of(work, struct vector_private, reset_tx);
1147 netdev_reset_queue(vp->dev);
1148 netif_start_queue(vp->dev);
1149 netif_wake_queue(vp->dev);
1150}
1151static int vector_net_open(struct net_device *dev)
1152{
1153 struct vector_private *vp = netdev_priv(dev);
1154 unsigned long flags;
1155 int err = -EINVAL;
1156 struct vector_device *vdevice;
1157
1158 spin_lock_irqsave(&vp->lock, flags);
1159 if (vp->opened) {
1160 spin_unlock_irqrestore(&vp->lock, flags);
1161 return -ENXIO;
1162 }
1163 vp->opened = true;
1164 spin_unlock_irqrestore(&vp->lock, flags);
1165
1166 vp->fds = uml_vector_user_open(vp->unit, vp->parsed);
1167
1168 if (vp->fds == NULL)
1169 goto out_close;
1170
1171 if (build_transport_data(vp) < 0)
1172 goto out_close;
1173
1174 if ((vp->options & VECTOR_RX) > 0) {
1175 vp->rx_queue = create_queue(
1176 vp,
1177 get_depth(vp->parsed),
1178 vp->rx_header_size,
1179 MAX_IOV_SIZE
1180 );
1181 vp->rx_queue->queue_depth = get_depth(vp->parsed);
1182 } else {
1183 vp->header_rxbuffer = kmalloc(
1184 vp->rx_header_size,
1185 GFP_KERNEL
1186 );
1187 if (vp->header_rxbuffer == NULL)
1188 goto out_close;
1189 }
1190 if ((vp->options & VECTOR_TX) > 0) {
1191 vp->tx_queue = create_queue(
1192 vp,
1193 get_depth(vp->parsed),
1194 vp->header_size,
1195 MAX_IOV_SIZE
1196 );
1197 } else {
1198 vp->header_txbuffer = kmalloc(vp->header_size, GFP_KERNEL);
1199 if (vp->header_txbuffer == NULL)
1200 goto out_close;
1201 }
1202
1203 /* READ IRQ */
1204 err = um_request_irq(
1205 irq_rr + VECTOR_BASE_IRQ, vp->fds->rx_fd,
1206 IRQ_READ, vector_rx_interrupt,
1207 IRQF_SHARED, dev->name, dev);
1208 if (err != 0) {
1209 netdev_err(dev, "vector_open: failed to get rx irq(%d)\n", err);
1210 err = -ENETUNREACH;
1211 goto out_close;
1212 }
1213 vp->rx_irq = irq_rr + VECTOR_BASE_IRQ;
1214 dev->irq = irq_rr + VECTOR_BASE_IRQ;
1215 irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
1216
1217 /* WRITE IRQ - we need it only if we have vector TX */
1218 if ((vp->options & VECTOR_TX) > 0) {
1219 err = um_request_irq(
1220 irq_rr + VECTOR_BASE_IRQ, vp->fds->tx_fd,
1221 IRQ_WRITE, vector_tx_interrupt,
1222 IRQF_SHARED, dev->name, dev);
1223 if (err != 0) {
1224 netdev_err(dev,
1225 "vector_open: failed to get tx irq(%d)\n", err);
1226 err = -ENETUNREACH;
1227 goto out_close;
1228 }
1229 vp->tx_irq = irq_rr + VECTOR_BASE_IRQ;
1230 irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
1231 }
1232
1233 if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
1234 if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
1235 vp->options = vp->options | VECTOR_BPF;
1236 }
1237
1238 if ((vp->options & VECTOR_BPF) != 0)
1239 vp->bpf = uml_vector_default_bpf(vp->fds->rx_fd, dev->dev_addr);
1240
1241 netif_start_queue(dev);
1242
1243 /* clear buffer - it can happen that the host side of the interface
1244 * is full when we get here. In this case, new data is never queued,
1245 * SIGIOs never arrive, and the net never works.
1246 */
1247
1248 vector_rx(vp);
1249
1250 vector_reset_stats(vp);
1251 vdevice = find_device(vp->unit);
1252 vdevice->opened = 1;
1253
1254 if ((vp->options & VECTOR_TX) != 0)
1255 add_timer(&vp->tl);
1256 return 0;
1257out_close:
1258 vector_net_close(dev);
1259 return err;
1260}
1261
1262
1263static void vector_net_set_multicast_list(struct net_device *dev)
1264{
1265 /* TODO: - we can do some BPF games here */
1266 return;
1267}
1268
1269static void vector_net_tx_timeout(struct net_device *dev)
1270{
1271 struct vector_private *vp = netdev_priv(dev);
1272
1273 vp->estats.tx_timeout_count++;
1274 netif_trans_update(dev);
1275 schedule_work(&vp->reset_tx);
1276}
1277
1278static netdev_features_t vector_fix_features(struct net_device *dev,
1279 netdev_features_t features)
1280{
1281 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
1282 return features;
1283}
1284
1285static int vector_set_features(struct net_device *dev,
1286 netdev_features_t features)
1287{
1288 struct vector_private *vp = netdev_priv(dev);
1289 /* Adjust buffer sizes for GSO/GRO. Unfortunately, there is
1290 * no way to negotiate it on raw sockets, so we can change
1291 * only our side.
1292 */
1293 if (features & NETIF_F_GRO)
1294 /* All new frame buffers will be GRO-sized */
1295 vp->req_size = 65536;
1296 else
1297 /* All new frame buffers will be normal sized */
1298 vp->req_size = vp->max_packet + vp->headroom + SAFETY_MARGIN;
1299 return 0;
1300}
1301
1302#ifdef CONFIG_NET_POLL_CONTROLLER
1303static void vector_net_poll_controller(struct net_device *dev)
1304{
1305 disable_irq(dev->irq);
1306 vector_rx_interrupt(dev->irq, dev);
1307 enable_irq(dev->irq);
1308}
1309#endif
1310
1311static void vector_net_get_drvinfo(struct net_device *dev,
1312 struct ethtool_drvinfo *info)
1313{
1314 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
1315 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
1316}
1317
1318static void vector_get_ringparam(struct net_device *netdev,
1319 struct ethtool_ringparam *ring)
1320{
1321 struct vector_private *vp = netdev_priv(netdev);
1322
1323 ring->rx_max_pending = vp->rx_queue->max_depth;
1324 ring->tx_max_pending = vp->tx_queue->max_depth;
1325 ring->rx_pending = vp->rx_queue->max_depth;
1326 ring->tx_pending = vp->tx_queue->max_depth;
1327}
1328
1329static void vector_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
1330{
1331 switch (stringset) {
1332 case ETH_SS_TEST:
1333 *buf = '\0';
1334 break;
1335 case ETH_SS_STATS:
1336 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
1337 break;
1338 default:
1339 WARN_ON(1);
1340 break;
1341 }
1342}
1343
1344static int vector_get_sset_count(struct net_device *dev, int sset)
1345{
1346 switch (sset) {
1347 case ETH_SS_TEST:
1348 return 0;
1349 case ETH_SS_STATS:
1350 return VECTOR_NUM_STATS;
1351 default:
1352 return -EOPNOTSUPP;
1353 }
1354}
1355
1356static void vector_get_ethtool_stats(struct net_device *dev,
1357 struct ethtool_stats *estats,
1358 u64 *tmp_stats)
1359{
1360 struct vector_private *vp = netdev_priv(dev);
1361
1362 memcpy(tmp_stats, &vp->estats, sizeof(struct vector_estats));
1363}
1364
1365static int vector_get_coalesce(struct net_device *netdev,
1366 struct ethtool_coalesce *ec)
1367{
1368 struct vector_private *vp = netdev_priv(netdev);
1369
1370 ec->tx_coalesce_usecs = (vp->coalesce * 1000000) / HZ;
1371 return 0;
1372}
1373
1374static int vector_set_coalesce(struct net_device *netdev,
1375 struct ethtool_coalesce *ec)
1376{
1377 struct vector_private *vp = netdev_priv(netdev);
1378
1379 vp->coalesce = (ec->tx_coalesce_usecs * HZ) / 1000000;
1380 if (vp->coalesce == 0)
1381 vp->coalesce = 1;
1382 return 0;
1383}
1384
1385static const struct ethtool_ops vector_net_ethtool_ops = {
1386 .get_drvinfo = vector_net_get_drvinfo,
1387 .get_link = ethtool_op_get_link,
1388 .get_ts_info = ethtool_op_get_ts_info,
1389 .get_ringparam = vector_get_ringparam,
1390 .get_strings = vector_get_strings,
1391 .get_sset_count = vector_get_sset_count,
1392 .get_ethtool_stats = vector_get_ethtool_stats,
1393 .get_coalesce = vector_get_coalesce,
1394 .set_coalesce = vector_set_coalesce,
1395};
1396
1397
1398static const struct net_device_ops vector_netdev_ops = {
1399 .ndo_open = vector_net_open,
1400 .ndo_stop = vector_net_close,
1401 .ndo_start_xmit = vector_net_start_xmit,
1402 .ndo_set_rx_mode = vector_net_set_multicast_list,
1403 .ndo_tx_timeout = vector_net_tx_timeout,
1404 .ndo_set_mac_address = eth_mac_addr,
1405 .ndo_validate_addr = eth_validate_addr,
1406 .ndo_fix_features = vector_fix_features,
1407 .ndo_set_features = vector_set_features,
1408#ifdef CONFIG_NET_POLL_CONTROLLER
1409 .ndo_poll_controller = vector_net_poll_controller,
1410#endif
1411};
1412
1413
1414static void vector_timer_expire(struct timer_list *t)
1415{
1416 struct vector_private *vp = from_timer(vp, t, tl);
1417
1418 vp->estats.tx_kicks++;
1419 vector_send(vp->tx_queue);
1420}
1421
1422static void vector_eth_configure(
1423 int n,
1424 struct arglist *def
1425 )
1426{
1427 struct vector_device *device;
1428 struct net_device *dev;
1429 struct vector_private *vp;
1430 int err;
1431
1432 device = kzalloc(sizeof(*device), GFP_KERNEL);
1433 if (device == NULL) {
1434 printk(KERN_ERR "eth_configure failed to allocate struct "
1435 "vector_device\n");
1436 return;
1437 }
1438 dev = alloc_etherdev(sizeof(struct vector_private));
1439 if (dev == NULL) {
1440 printk(KERN_ERR "eth_configure: failed to allocate struct "
1441 "net_device for vec%d\n", n);
1442 goto out_free_device;
1443 }
1444
1445 dev->mtu = get_mtu(def);
1446
1447 INIT_LIST_HEAD(&device->list);
1448 device->unit = n;
1449
1450 /* If this name ends up conflicting with an existing registered
1451 * netdevice, that is OK, register_netdev{,ice}() will notice this
1452 * and fail.
1453 */
1454 snprintf(dev->name, sizeof(dev->name), "vec%d", n);
1455 uml_net_setup_etheraddr(dev, uml_vector_fetch_arg(def, "mac"));
1456 vp = netdev_priv(dev);
1457
1458 /* sysfs register */
1459 if (!driver_registered) {
1460 platform_driver_register(¨_net_driver);
1461 driver_registered = 1;
1462 }
1463 device->pdev.id = n;
1464 device->pdev.name = DRIVER_NAME;
1465 device->pdev.dev.release = vector_device_release;
1466 dev_set_drvdata(&device->pdev.dev, device);
1467 if (platform_device_register(&device->pdev))
1468 goto out_free_netdev;
1469 SET_NETDEV_DEV(dev, &device->pdev.dev);
1470
1471 device->dev = dev;
1472
1473 *vp = ((struct vector_private)
1474 {
1475 .list = LIST_HEAD_INIT(vp->list),
1476 .dev = dev,
1477 .unit = n,
1478 .options = get_transport_options(def),
1479 .rx_irq = 0,
1480 .tx_irq = 0,
1481 .parsed = def,
1482 .max_packet = get_mtu(def) + ETH_HEADER_OTHER,
1483 /* TODO - we need to calculate headroom so that ip header
1484 * is 16 byte aligned all the time
1485 */
1486 .headroom = get_headroom(def),
1487 .form_header = NULL,
1488 .verify_header = NULL,
1489 .header_rxbuffer = NULL,
1490 .header_txbuffer = NULL,
1491 .header_size = 0,
1492 .rx_header_size = 0,
1493 .rexmit_scheduled = false,
1494 .opened = false,
1495 .transport_data = NULL,
1496 .in_write_poll = false,
1497 .coalesce = 2,
1498 .req_size = get_req_size(def)
1499 });
1500
1501 dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST);
1502 tasklet_init(&vp->tx_poll, vector_tx_poll, (unsigned long)vp);
1503 INIT_WORK(&vp->reset_tx, vector_reset_tx);
1504
1505 timer_setup(&vp->tl, vector_timer_expire, 0);
1506 spin_lock_init(&vp->lock);
1507
1508 /* FIXME */
1509 dev->netdev_ops = &vector_netdev_ops;
1510 dev->ethtool_ops = &vector_net_ethtool_ops;
1511 dev->watchdog_timeo = (HZ >> 1);
1512 /* primary IRQ - fixme */
1513 dev->irq = 0; /* we will adjust this once opened */
1514
1515 rtnl_lock();
1516 err = register_netdevice(dev);
1517 rtnl_unlock();
1518 if (err)
1519 goto out_undo_user_init;
1520
1521 spin_lock(&vector_devices_lock);
1522 list_add(&device->list, &vector_devices);
1523 spin_unlock(&vector_devices_lock);
1524
1525 return;
1526
1527out_undo_user_init:
1528 return;
1529out_free_netdev:
1530 free_netdev(dev);
1531out_free_device:
1532 kfree(device);
1533}
1534
1535
1536
1537
1538/*
1539 * Invoked late in the init
1540 */
1541
1542static int __init vector_init(void)
1543{
1544 struct list_head *ele;
1545 struct vector_cmd_line_arg *def;
1546 struct arglist *parsed;
1547
1548 list_for_each(ele, &vec_cmd_line) {
1549 def = list_entry(ele, struct vector_cmd_line_arg, list);
1550 parsed = uml_parse_vector_ifspec(def->arguments);
1551 if (parsed != NULL)
1552 vector_eth_configure(def->unit, parsed);
1553 }
1554 return 0;
1555}
1556
1557
1558/* Invoked at initial argument parsing, only stores
1559 * arguments until a proper vector_init is called
1560 * later
1561 */
1562
1563static int __init vector_setup(char *str)
1564{
1565 char *error;
1566 int n, err;
1567 struct vector_cmd_line_arg *new;
1568
1569 err = vector_parse(str, &n, &str, &error);
1570 if (err) {
1571 printk(KERN_ERR "vector_setup - Couldn't parse '%s' : %s\n",
1572 str, error);
1573 return 1;
1574 }
1575 new = alloc_bootmem(sizeof(*new));
1576 INIT_LIST_HEAD(&new->list);
1577 new->unit = n;
1578 new->arguments = str;
1579 list_add_tail(&new->list, &vec_cmd_line);
1580 return 1;
1581}
1582
1583__setup("vec", vector_setup);
1584__uml_help(vector_setup,
1585"vec[0-9]+:<option>=<value>,<option>=<value>\n"
1586" Configure a vector io network device.\n\n"
1587);
1588
1589late_initcall(vector_init);
1590
1591static struct mc_device vector_mc = {
1592 .list = LIST_HEAD_INIT(vector_mc.list),
1593 .name = "vec",
1594 .config = vector_config,
1595 .get_config = NULL,
1596 .id = vector_id,
1597 .remove = vector_remove,
1598};
1599
1600#ifdef CONFIG_INET
1601static int vector_inetaddr_event(
1602 struct notifier_block *this,
1603 unsigned long event,
1604 void *ptr)
1605{
1606 return NOTIFY_DONE;
1607}
1608
1609static struct notifier_block vector_inetaddr_notifier = {
1610 .notifier_call = vector_inetaddr_event,
1611};
1612
1613static void inet_register(void)
1614{
1615 register_inetaddr_notifier(&vector_inetaddr_notifier);
1616}
1617#else
1618static inline void inet_register(void)
1619{
1620}
1621#endif
1622
1623static int vector_net_init(void)
1624{
1625 mconsole_register_dev(&vector_mc);
1626 inet_register();
1627 return 0;
1628}
1629
1630__initcall(vector_net_init);
1631
1632
1633
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2017 - 2019 Cambridge Greys Limited
4 * Copyright (C) 2011 - 2014 Cisco Systems Inc
5 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
7 * James Leu (jleu@mindspring.net).
8 * Copyright (C) 2001 by various other people who didn't put their name here.
9 */
10
11#include <linux/memblock.h>
12#include <linux/etherdevice.h>
13#include <linux/ethtool.h>
14#include <linux/inetdevice.h>
15#include <linux/init.h>
16#include <linux/list.h>
17#include <linux/netdevice.h>
18#include <linux/platform_device.h>
19#include <linux/rtnetlink.h>
20#include <linux/skbuff.h>
21#include <linux/slab.h>
22#include <linux/interrupt.h>
23#include <linux/firmware.h>
24#include <linux/fs.h>
25#include <asm/atomic.h>
26#include <uapi/linux/filter.h>
27#include <init.h>
28#include <irq_kern.h>
29#include <irq_user.h>
30#include <net_kern.h>
31#include <os.h>
32#include "mconsole_kern.h"
33#include "vector_user.h"
34#include "vector_kern.h"
35
36/*
37 * Adapted from network devices with the following major changes:
38 * All transports are static - simplifies the code significantly
39 * Multiple FDs/IRQs per device
40 * Vector IO optionally used for read/write, falling back to legacy
41 * based on configuration and/or availability
42 * Configuration is no longer positional - L2TPv3 and GRE require up to
43 * 10 parameters, passing this as positional is not fit for purpose.
44 * Only socket transports are supported
45 */
46
47
48#define DRIVER_NAME "uml-vector"
49struct vector_cmd_line_arg {
50 struct list_head list;
51 int unit;
52 char *arguments;
53};
54
55struct vector_device {
56 struct list_head list;
57 struct net_device *dev;
58 struct platform_device pdev;
59 int unit;
60 int opened;
61};
62
63static LIST_HEAD(vec_cmd_line);
64
65static DEFINE_SPINLOCK(vector_devices_lock);
66static LIST_HEAD(vector_devices);
67
68static int driver_registered;
69
70static void vector_eth_configure(int n, struct arglist *def);
71static int vector_mmsg_rx(struct vector_private *vp, int budget);
72
73/* Argument accessors to set variables (and/or set default values)
74 * mtu, buffer sizing, default headroom, etc
75 */
76
77#define DEFAULT_HEADROOM 2
78#define SAFETY_MARGIN 32
79#define DEFAULT_VECTOR_SIZE 64
80#define TX_SMALL_PACKET 128
81#define MAX_IOV_SIZE (MAX_SKB_FRAGS + 1)
82
83static const struct {
84 const char string[ETH_GSTRING_LEN];
85} ethtool_stats_keys[] = {
86 { "rx_queue_max" },
87 { "rx_queue_running_average" },
88 { "tx_queue_max" },
89 { "tx_queue_running_average" },
90 { "rx_encaps_errors" },
91 { "tx_timeout_count" },
92 { "tx_restart_queue" },
93 { "tx_kicks" },
94 { "tx_flow_control_xon" },
95 { "tx_flow_control_xoff" },
96 { "rx_csum_offload_good" },
97 { "rx_csum_offload_errors"},
98 { "sg_ok"},
99 { "sg_linearized"},
100};
101
102#define VECTOR_NUM_STATS ARRAY_SIZE(ethtool_stats_keys)
103
104static void vector_reset_stats(struct vector_private *vp)
105{
106 /* We reuse the existing queue locks for stats */
107
108 /* RX stats are modified with RX head_lock held
109 * in vector_poll.
110 */
111
112 spin_lock(&vp->rx_queue->head_lock);
113 vp->estats.rx_queue_max = 0;
114 vp->estats.rx_queue_running_average = 0;
115 vp->estats.rx_encaps_errors = 0;
116 vp->estats.sg_ok = 0;
117 vp->estats.sg_linearized = 0;
118 spin_unlock(&vp->rx_queue->head_lock);
119
120 /* TX stats are modified with TX head_lock held
121 * in vector_send.
122 */
123
124 spin_lock(&vp->tx_queue->head_lock);
125 vp->estats.tx_timeout_count = 0;
126 vp->estats.tx_restart_queue = 0;
127 vp->estats.tx_kicks = 0;
128 vp->estats.tx_flow_control_xon = 0;
129 vp->estats.tx_flow_control_xoff = 0;
130 vp->estats.tx_queue_max = 0;
131 vp->estats.tx_queue_running_average = 0;
132 spin_unlock(&vp->tx_queue->head_lock);
133}
134
135static int get_mtu(struct arglist *def)
136{
137 char *mtu = uml_vector_fetch_arg(def, "mtu");
138 long result;
139
140 if (mtu != NULL) {
141 if (kstrtoul(mtu, 10, &result) == 0)
142 if ((result < (1 << 16) - 1) && (result >= 576))
143 return result;
144 }
145 return ETH_MAX_PACKET;
146}
147
148static char *get_bpf_file(struct arglist *def)
149{
150 return uml_vector_fetch_arg(def, "bpffile");
151}
152
153static bool get_bpf_flash(struct arglist *def)
154{
155 char *allow = uml_vector_fetch_arg(def, "bpfflash");
156 long result;
157
158 if (allow != NULL) {
159 if (kstrtoul(allow, 10, &result) == 0)
160 return result > 0;
161 }
162 return false;
163}
164
165static int get_depth(struct arglist *def)
166{
167 char *mtu = uml_vector_fetch_arg(def, "depth");
168 long result;
169
170 if (mtu != NULL) {
171 if (kstrtoul(mtu, 10, &result) == 0)
172 return result;
173 }
174 return DEFAULT_VECTOR_SIZE;
175}
176
177static int get_headroom(struct arglist *def)
178{
179 char *mtu = uml_vector_fetch_arg(def, "headroom");
180 long result;
181
182 if (mtu != NULL) {
183 if (kstrtoul(mtu, 10, &result) == 0)
184 return result;
185 }
186 return DEFAULT_HEADROOM;
187}
188
189static int get_req_size(struct arglist *def)
190{
191 char *gro = uml_vector_fetch_arg(def, "gro");
192 long result;
193
194 if (gro != NULL) {
195 if (kstrtoul(gro, 10, &result) == 0) {
196 if (result > 0)
197 return 65536;
198 }
199 }
200 return get_mtu(def) + ETH_HEADER_OTHER +
201 get_headroom(def) + SAFETY_MARGIN;
202}
203
204
205static int get_transport_options(struct arglist *def)
206{
207 char *transport = uml_vector_fetch_arg(def, "transport");
208 char *vector = uml_vector_fetch_arg(def, "vec");
209
210 int vec_rx = VECTOR_RX;
211 int vec_tx = VECTOR_TX;
212 long parsed;
213 int result = 0;
214
215 if (transport == NULL)
216 return -EINVAL;
217
218 if (vector != NULL) {
219 if (kstrtoul(vector, 10, &parsed) == 0) {
220 if (parsed == 0) {
221 vec_rx = 0;
222 vec_tx = 0;
223 }
224 }
225 }
226
227 if (get_bpf_flash(def))
228 result = VECTOR_BPF_FLASH;
229
230 if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
231 return result;
232 if (strncmp(transport, TRANS_HYBRID, TRANS_HYBRID_LEN) == 0)
233 return (result | vec_rx | VECTOR_BPF);
234 if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
235 return (result | vec_rx | vec_tx | VECTOR_QDISC_BYPASS);
236 return (result | vec_rx | vec_tx);
237}
238
239
240/* A mini-buffer for packet drop read
241 * All of our supported transports are datagram oriented and we always
242 * read using recvmsg or recvmmsg. If we pass a buffer which is smaller
243 * than the packet size it still counts as full packet read and will
244 * clean the incoming stream to keep sigio/epoll happy
245 */
246
247#define DROP_BUFFER_SIZE 32
248
249static char *drop_buffer;
250
251
252/*
253 * Advance the mmsg queue head by n = advance. Resets the queue to
254 * maximum enqueue/dequeue-at-once capacity if possible. Called by
255 * dequeuers. Caller must hold the head_lock!
256 */
257
258static int vector_advancehead(struct vector_queue *qi, int advance)
259{
260 qi->head =
261 (qi->head + advance)
262 % qi->max_depth;
263
264
265 atomic_sub(advance, &qi->queue_depth);
266 return atomic_read(&qi->queue_depth);
267}
268
269/* Advance the queue tail by n = advance.
270 * This is called by enqueuers which should hold the
271 * head lock already
272 */
273
274static int vector_advancetail(struct vector_queue *qi, int advance)
275{
276 qi->tail =
277 (qi->tail + advance)
278 % qi->max_depth;
279 atomic_add(advance, &qi->queue_depth);
280 return atomic_read(&qi->queue_depth);
281}
282
283static int prep_msg(struct vector_private *vp,
284 struct sk_buff *skb,
285 struct iovec *iov)
286{
287 int iov_index = 0;
288 int nr_frags, frag;
289 skb_frag_t *skb_frag;
290
291 nr_frags = skb_shinfo(skb)->nr_frags;
292 if (nr_frags > MAX_IOV_SIZE) {
293 if (skb_linearize(skb) != 0)
294 goto drop;
295 }
296 if (vp->header_size > 0) {
297 iov[iov_index].iov_len = vp->header_size;
298 vp->form_header(iov[iov_index].iov_base, skb, vp);
299 iov_index++;
300 }
301 iov[iov_index].iov_base = skb->data;
302 if (nr_frags > 0) {
303 iov[iov_index].iov_len = skb->len - skb->data_len;
304 vp->estats.sg_ok++;
305 } else
306 iov[iov_index].iov_len = skb->len;
307 iov_index++;
308 for (frag = 0; frag < nr_frags; frag++) {
309 skb_frag = &skb_shinfo(skb)->frags[frag];
310 iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
311 iov[iov_index].iov_len = skb_frag_size(skb_frag);
312 iov_index++;
313 }
314 return iov_index;
315drop:
316 return -1;
317}
318/*
319 * Generic vector enqueue with support for forming headers using transport
320 * specific callback. Allows GRE, L2TPv3, RAW and other transports
321 * to use a common enqueue procedure in vector mode
322 */
323
324static int vector_enqueue(struct vector_queue *qi, struct sk_buff *skb)
325{
326 struct vector_private *vp = netdev_priv(qi->dev);
327 int queue_depth;
328 int packet_len;
329 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
330 int iov_count;
331
332 spin_lock(&qi->tail_lock);
333 queue_depth = atomic_read(&qi->queue_depth);
334
335 if (skb)
336 packet_len = skb->len;
337
338 if (queue_depth < qi->max_depth) {
339
340 *(qi->skbuff_vector + qi->tail) = skb;
341 mmsg_vector += qi->tail;
342 iov_count = prep_msg(
343 vp,
344 skb,
345 mmsg_vector->msg_hdr.msg_iov
346 );
347 if (iov_count < 1)
348 goto drop;
349 mmsg_vector->msg_hdr.msg_iovlen = iov_count;
350 mmsg_vector->msg_hdr.msg_name = vp->fds->remote_addr;
351 mmsg_vector->msg_hdr.msg_namelen = vp->fds->remote_addr_size;
352 wmb(); /* Make the packet visible to the NAPI poll thread */
353 queue_depth = vector_advancetail(qi, 1);
354 } else
355 goto drop;
356 spin_unlock(&qi->tail_lock);
357 return queue_depth;
358drop:
359 qi->dev->stats.tx_dropped++;
360 if (skb != NULL) {
361 packet_len = skb->len;
362 dev_consume_skb_any(skb);
363 netdev_completed_queue(qi->dev, 1, packet_len);
364 }
365 spin_unlock(&qi->tail_lock);
366 return queue_depth;
367}
368
369static int consume_vector_skbs(struct vector_queue *qi, int count)
370{
371 struct sk_buff *skb;
372 int skb_index;
373 int bytes_compl = 0;
374
375 for (skb_index = qi->head; skb_index < qi->head + count; skb_index++) {
376 skb = *(qi->skbuff_vector + skb_index);
377 /* mark as empty to ensure correct destruction if
378 * needed
379 */
380 bytes_compl += skb->len;
381 *(qi->skbuff_vector + skb_index) = NULL;
382 dev_consume_skb_any(skb);
383 }
384 qi->dev->stats.tx_bytes += bytes_compl;
385 qi->dev->stats.tx_packets += count;
386 netdev_completed_queue(qi->dev, count, bytes_compl);
387 return vector_advancehead(qi, count);
388}
389
390/*
391 * Generic vector dequeue via sendmmsg with support for forming headers
392 * using transport specific callback. Allows GRE, L2TPv3, RAW and
393 * other transports to use a common dequeue procedure in vector mode
394 */
395
396
397static int vector_send(struct vector_queue *qi)
398{
399 struct vector_private *vp = netdev_priv(qi->dev);
400 struct mmsghdr *send_from;
401 int result = 0, send_len;
402
403 if (spin_trylock(&qi->head_lock)) {
404 /* update queue_depth to current value */
405 while (atomic_read(&qi->queue_depth) > 0) {
406 /* Calculate the start of the vector */
407 send_len = atomic_read(&qi->queue_depth);
408 send_from = qi->mmsg_vector;
409 send_from += qi->head;
410 /* Adjust vector size if wraparound */
411 if (send_len + qi->head > qi->max_depth)
412 send_len = qi->max_depth - qi->head;
413 /* Try to TX as many packets as possible */
414 if (send_len > 0) {
415 result = uml_vector_sendmmsg(
416 vp->fds->tx_fd,
417 send_from,
418 send_len,
419 0
420 );
421 vp->in_write_poll =
422 (result != send_len);
423 }
424 /* For some of the sendmmsg error scenarios
425 * we may end being unsure in the TX success
426 * for all packets. It is safer to declare
427 * them all TX-ed and blame the network.
428 */
429 if (result < 0) {
430 if (net_ratelimit())
431 netdev_err(vp->dev, "sendmmsg err=%i\n",
432 result);
433 vp->in_error = true;
434 result = send_len;
435 }
436 if (result > 0) {
437 consume_vector_skbs(qi, result);
438 /* This is equivalent to an TX IRQ.
439 * Restart the upper layers to feed us
440 * more packets.
441 */
442 if (result > vp->estats.tx_queue_max)
443 vp->estats.tx_queue_max = result;
444 vp->estats.tx_queue_running_average =
445 (vp->estats.tx_queue_running_average + result) >> 1;
446 }
447 netif_wake_queue(qi->dev);
448 /* if TX is busy, break out of the send loop,
449 * poll write IRQ will reschedule xmit for us.
450 */
451 if (result != send_len) {
452 vp->estats.tx_restart_queue++;
453 break;
454 }
455 }
456 spin_unlock(&qi->head_lock);
457 }
458 return atomic_read(&qi->queue_depth);
459}
460
461/* Queue destructor. Deliberately stateless so we can use
462 * it in queue cleanup if initialization fails.
463 */
464
465static void destroy_queue(struct vector_queue *qi)
466{
467 int i;
468 struct iovec *iov;
469 struct vector_private *vp = netdev_priv(qi->dev);
470 struct mmsghdr *mmsg_vector;
471
472 if (qi == NULL)
473 return;
474 /* deallocate any skbuffs - we rely on any unused to be
475 * set to NULL.
476 */
477 if (qi->skbuff_vector != NULL) {
478 for (i = 0; i < qi->max_depth; i++) {
479 if (*(qi->skbuff_vector + i) != NULL)
480 dev_kfree_skb_any(*(qi->skbuff_vector + i));
481 }
482 kfree(qi->skbuff_vector);
483 }
484 /* deallocate matching IOV structures including header buffs */
485 if (qi->mmsg_vector != NULL) {
486 mmsg_vector = qi->mmsg_vector;
487 for (i = 0; i < qi->max_depth; i++) {
488 iov = mmsg_vector->msg_hdr.msg_iov;
489 if (iov != NULL) {
490 if ((vp->header_size > 0) &&
491 (iov->iov_base != NULL))
492 kfree(iov->iov_base);
493 kfree(iov);
494 }
495 mmsg_vector++;
496 }
497 kfree(qi->mmsg_vector);
498 }
499 kfree(qi);
500}
501
502/*
503 * Queue constructor. Create a queue with a given side.
504 */
505static struct vector_queue *create_queue(
506 struct vector_private *vp,
507 int max_size,
508 int header_size,
509 int num_extra_frags)
510{
511 struct vector_queue *result;
512 int i;
513 struct iovec *iov;
514 struct mmsghdr *mmsg_vector;
515
516 result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
517 if (result == NULL)
518 return NULL;
519 result->max_depth = max_size;
520 result->dev = vp->dev;
521 result->mmsg_vector = kmalloc(
522 (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
523 if (result->mmsg_vector == NULL)
524 goto out_mmsg_fail;
525 result->skbuff_vector = kmalloc(
526 (sizeof(void *) * max_size), GFP_KERNEL);
527 if (result->skbuff_vector == NULL)
528 goto out_skb_fail;
529
530 /* further failures can be handled safely by destroy_queue*/
531
532 mmsg_vector = result->mmsg_vector;
533 for (i = 0; i < max_size; i++) {
534 /* Clear all pointers - we use non-NULL as marking on
535 * what to free on destruction
536 */
537 *(result->skbuff_vector + i) = NULL;
538 mmsg_vector->msg_hdr.msg_iov = NULL;
539 mmsg_vector++;
540 }
541 mmsg_vector = result->mmsg_vector;
542 result->max_iov_frags = num_extra_frags;
543 for (i = 0; i < max_size; i++) {
544 if (vp->header_size > 0)
545 iov = kmalloc_array(3 + num_extra_frags,
546 sizeof(struct iovec),
547 GFP_KERNEL
548 );
549 else
550 iov = kmalloc_array(2 + num_extra_frags,
551 sizeof(struct iovec),
552 GFP_KERNEL
553 );
554 if (iov == NULL)
555 goto out_fail;
556 mmsg_vector->msg_hdr.msg_iov = iov;
557 mmsg_vector->msg_hdr.msg_iovlen = 1;
558 mmsg_vector->msg_hdr.msg_control = NULL;
559 mmsg_vector->msg_hdr.msg_controllen = 0;
560 mmsg_vector->msg_hdr.msg_flags = MSG_DONTWAIT;
561 mmsg_vector->msg_hdr.msg_name = NULL;
562 mmsg_vector->msg_hdr.msg_namelen = 0;
563 if (vp->header_size > 0) {
564 iov->iov_base = kmalloc(header_size, GFP_KERNEL);
565 if (iov->iov_base == NULL)
566 goto out_fail;
567 iov->iov_len = header_size;
568 mmsg_vector->msg_hdr.msg_iovlen = 2;
569 iov++;
570 }
571 iov->iov_base = NULL;
572 iov->iov_len = 0;
573 mmsg_vector++;
574 }
575 spin_lock_init(&result->head_lock);
576 spin_lock_init(&result->tail_lock);
577 atomic_set(&result->queue_depth, 0);
578 result->head = 0;
579 result->tail = 0;
580 return result;
581out_skb_fail:
582 kfree(result->mmsg_vector);
583out_mmsg_fail:
584 kfree(result);
585 return NULL;
586out_fail:
587 destroy_queue(result);
588 return NULL;
589}
590
591/*
592 * We do not use the RX queue as a proper wraparound queue for now
593 * This is not necessary because the consumption via napi_gro_receive()
594 * happens in-line. While we can try using the return code of
595 * netif_rx() for flow control there are no drivers doing this today.
596 * For this RX specific use we ignore the tail/head locks and
597 * just read into a prepared queue filled with skbuffs.
598 */
599
600static struct sk_buff *prep_skb(
601 struct vector_private *vp,
602 struct user_msghdr *msg)
603{
604 int linear = vp->max_packet + vp->headroom + SAFETY_MARGIN;
605 struct sk_buff *result;
606 int iov_index = 0, len;
607 struct iovec *iov = msg->msg_iov;
608 int err, nr_frags, frag;
609 skb_frag_t *skb_frag;
610
611 if (vp->req_size <= linear)
612 len = linear;
613 else
614 len = vp->req_size;
615 result = alloc_skb_with_frags(
616 linear,
617 len - vp->max_packet,
618 3,
619 &err,
620 GFP_ATOMIC
621 );
622 if (vp->header_size > 0)
623 iov_index++;
624 if (result == NULL) {
625 iov[iov_index].iov_base = NULL;
626 iov[iov_index].iov_len = 0;
627 goto done;
628 }
629 skb_reserve(result, vp->headroom);
630 result->dev = vp->dev;
631 skb_put(result, vp->max_packet);
632 result->data_len = len - vp->max_packet;
633 result->len += len - vp->max_packet;
634 skb_reset_mac_header(result);
635 result->ip_summed = CHECKSUM_NONE;
636 iov[iov_index].iov_base = result->data;
637 iov[iov_index].iov_len = vp->max_packet;
638 iov_index++;
639
640 nr_frags = skb_shinfo(result)->nr_frags;
641 for (frag = 0; frag < nr_frags; frag++) {
642 skb_frag = &skb_shinfo(result)->frags[frag];
643 iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
644 if (iov[iov_index].iov_base != NULL)
645 iov[iov_index].iov_len = skb_frag_size(skb_frag);
646 else
647 iov[iov_index].iov_len = 0;
648 iov_index++;
649 }
650done:
651 msg->msg_iovlen = iov_index;
652 return result;
653}
654
655
656/* Prepare queue for recvmmsg one-shot rx - fill with fresh sk_buffs */
657
658static void prep_queue_for_rx(struct vector_queue *qi)
659{
660 struct vector_private *vp = netdev_priv(qi->dev);
661 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
662 void **skbuff_vector = qi->skbuff_vector;
663 int i, queue_depth;
664
665 queue_depth = atomic_read(&qi->queue_depth);
666
667 if (queue_depth == 0)
668 return;
669
670 /* RX is always emptied 100% during each cycle, so we do not
671 * have to do the tail wraparound math for it.
672 */
673
674 qi->head = qi->tail = 0;
675
676 for (i = 0; i < queue_depth; i++) {
677 /* it is OK if allocation fails - recvmmsg with NULL data in
678 * iov argument still performs an RX, just drops the packet
679 * This allows us stop faffing around with a "drop buffer"
680 */
681
682 *skbuff_vector = prep_skb(vp, &mmsg_vector->msg_hdr);
683 skbuff_vector++;
684 mmsg_vector++;
685 }
686 atomic_set(&qi->queue_depth, 0);
687}
688
689static struct vector_device *find_device(int n)
690{
691 struct vector_device *device;
692 struct list_head *ele;
693
694 spin_lock(&vector_devices_lock);
695 list_for_each(ele, &vector_devices) {
696 device = list_entry(ele, struct vector_device, list);
697 if (device->unit == n)
698 goto out;
699 }
700 device = NULL;
701 out:
702 spin_unlock(&vector_devices_lock);
703 return device;
704}
705
706static int vector_parse(char *str, int *index_out, char **str_out,
707 char **error_out)
708{
709 int n, err;
710 char *start = str;
711
712 while ((*str != ':') && (strlen(str) > 1))
713 str++;
714 if (*str != ':') {
715 *error_out = "Expected ':' after device number";
716 return -EINVAL;
717 }
718 *str = '\0';
719
720 err = kstrtouint(start, 0, &n);
721 if (err < 0) {
722 *error_out = "Bad device number";
723 return err;
724 }
725
726 str++;
727 if (find_device(n)) {
728 *error_out = "Device already configured";
729 return -EINVAL;
730 }
731
732 *index_out = n;
733 *str_out = str;
734 return 0;
735}
736
737static int vector_config(char *str, char **error_out)
738{
739 int err, n;
740 char *params;
741 struct arglist *parsed;
742
743 err = vector_parse(str, &n, ¶ms, error_out);
744 if (err != 0)
745 return err;
746
747 /* This string is broken up and the pieces used by the underlying
748 * driver. We should copy it to make sure things do not go wrong
749 * later.
750 */
751
752 params = kstrdup(params, GFP_KERNEL);
753 if (params == NULL) {
754 *error_out = "vector_config failed to strdup string";
755 return -ENOMEM;
756 }
757
758 parsed = uml_parse_vector_ifspec(params);
759
760 if (parsed == NULL) {
761 *error_out = "vector_config failed to parse parameters";
762 kfree(params);
763 return -EINVAL;
764 }
765
766 vector_eth_configure(n, parsed);
767 return 0;
768}
769
770static int vector_id(char **str, int *start_out, int *end_out)
771{
772 char *end;
773 int n;
774
775 n = simple_strtoul(*str, &end, 0);
776 if ((*end != '\0') || (end == *str))
777 return -1;
778
779 *start_out = n;
780 *end_out = n;
781 *str = end;
782 return n;
783}
784
785static int vector_remove(int n, char **error_out)
786{
787 struct vector_device *vec_d;
788 struct net_device *dev;
789 struct vector_private *vp;
790
791 vec_d = find_device(n);
792 if (vec_d == NULL)
793 return -ENODEV;
794 dev = vec_d->dev;
795 vp = netdev_priv(dev);
796 if (vp->fds != NULL)
797 return -EBUSY;
798 unregister_netdev(dev);
799 platform_device_unregister(&vec_d->pdev);
800 return 0;
801}
802
803/*
804 * There is no shared per-transport initialization code, so
805 * we will just initialize each interface one by one and
806 * add them to a list
807 */
808
809static struct platform_driver uml_net_driver = {
810 .driver = {
811 .name = DRIVER_NAME,
812 },
813};
814
815
816static void vector_device_release(struct device *dev)
817{
818 struct vector_device *device =
819 container_of(dev, struct vector_device, pdev.dev);
820 struct net_device *netdev = device->dev;
821
822 list_del(&device->list);
823 kfree(device);
824 free_netdev(netdev);
825}
826
827/* Bog standard recv using recvmsg - not used normally unless the user
828 * explicitly specifies not to use recvmmsg vector RX.
829 */
830
831static int vector_legacy_rx(struct vector_private *vp)
832{
833 int pkt_len;
834 struct user_msghdr hdr;
835 struct iovec iov[2 + MAX_IOV_SIZE]; /* header + data use case only */
836 int iovpos = 0;
837 struct sk_buff *skb;
838 int header_check;
839
840 hdr.msg_name = NULL;
841 hdr.msg_namelen = 0;
842 hdr.msg_iov = (struct iovec *) &iov;
843 hdr.msg_control = NULL;
844 hdr.msg_controllen = 0;
845 hdr.msg_flags = 0;
846
847 if (vp->header_size > 0) {
848 iov[0].iov_base = vp->header_rxbuffer;
849 iov[0].iov_len = vp->header_size;
850 }
851
852 skb = prep_skb(vp, &hdr);
853
854 if (skb == NULL) {
855 /* Read a packet into drop_buffer and don't do
856 * anything with it.
857 */
858 iov[iovpos].iov_base = drop_buffer;
859 iov[iovpos].iov_len = DROP_BUFFER_SIZE;
860 hdr.msg_iovlen = 1;
861 vp->dev->stats.rx_dropped++;
862 }
863
864 pkt_len = uml_vector_recvmsg(vp->fds->rx_fd, &hdr, 0);
865 if (pkt_len < 0) {
866 vp->in_error = true;
867 return pkt_len;
868 }
869
870 if (skb != NULL) {
871 if (pkt_len > vp->header_size) {
872 if (vp->header_size > 0) {
873 header_check = vp->verify_header(
874 vp->header_rxbuffer, skb, vp);
875 if (header_check < 0) {
876 dev_kfree_skb_irq(skb);
877 vp->dev->stats.rx_dropped++;
878 vp->estats.rx_encaps_errors++;
879 return 0;
880 }
881 if (header_check > 0) {
882 vp->estats.rx_csum_offload_good++;
883 skb->ip_summed = CHECKSUM_UNNECESSARY;
884 }
885 }
886 pskb_trim(skb, pkt_len - vp->rx_header_size);
887 skb->protocol = eth_type_trans(skb, skb->dev);
888 vp->dev->stats.rx_bytes += skb->len;
889 vp->dev->stats.rx_packets++;
890 napi_gro_receive(&vp->napi, skb);
891 } else {
892 dev_kfree_skb_irq(skb);
893 }
894 }
895 return pkt_len;
896}
897
898/*
899 * Packet at a time TX which falls back to vector TX if the
900 * underlying transport is busy.
901 */
902
903
904
905static int writev_tx(struct vector_private *vp, struct sk_buff *skb)
906{
907 struct iovec iov[3 + MAX_IOV_SIZE];
908 int iov_count, pkt_len = 0;
909
910 iov[0].iov_base = vp->header_txbuffer;
911 iov_count = prep_msg(vp, skb, (struct iovec *) &iov);
912
913 if (iov_count < 1)
914 goto drop;
915
916 pkt_len = uml_vector_writev(
917 vp->fds->tx_fd,
918 (struct iovec *) &iov,
919 iov_count
920 );
921
922 if (pkt_len < 0)
923 goto drop;
924
925 netif_trans_update(vp->dev);
926 netif_wake_queue(vp->dev);
927
928 if (pkt_len > 0) {
929 vp->dev->stats.tx_bytes += skb->len;
930 vp->dev->stats.tx_packets++;
931 } else {
932 vp->dev->stats.tx_dropped++;
933 }
934 consume_skb(skb);
935 return pkt_len;
936drop:
937 vp->dev->stats.tx_dropped++;
938 consume_skb(skb);
939 if (pkt_len < 0)
940 vp->in_error = true;
941 return pkt_len;
942}
943
944/*
945 * Receive as many messages as we can in one call using the special
946 * mmsg vector matched to an skb vector which we prepared earlier.
947 */
948
949static int vector_mmsg_rx(struct vector_private *vp, int budget)
950{
951 int packet_count, i;
952 struct vector_queue *qi = vp->rx_queue;
953 struct sk_buff *skb;
954 struct mmsghdr *mmsg_vector = qi->mmsg_vector;
955 void **skbuff_vector = qi->skbuff_vector;
956 int header_check;
957
958 /* Refresh the vector and make sure it is with new skbs and the
959 * iovs are updated to point to them.
960 */
961
962 prep_queue_for_rx(qi);
963
964 /* Fire the Lazy Gun - get as many packets as we can in one go. */
965
966 if (budget > qi->max_depth)
967 budget = qi->max_depth;
968
969 packet_count = uml_vector_recvmmsg(
970 vp->fds->rx_fd, qi->mmsg_vector, budget, 0);
971
972 if (packet_count < 0)
973 vp->in_error = true;
974
975 if (packet_count <= 0)
976 return packet_count;
977
978 /* We treat packet processing as enqueue, buffer refresh as dequeue
979 * The queue_depth tells us how many buffers have been used and how
980 * many do we need to prep the next time prep_queue_for_rx() is called.
981 */
982
983 atomic_add(packet_count, &qi->queue_depth);
984
985 for (i = 0; i < packet_count; i++) {
986 skb = (*skbuff_vector);
987 if (mmsg_vector->msg_len > vp->header_size) {
988 if (vp->header_size > 0) {
989 header_check = vp->verify_header(
990 mmsg_vector->msg_hdr.msg_iov->iov_base,
991 skb,
992 vp
993 );
994 if (header_check < 0) {
995 /* Overlay header failed to verify - discard.
996 * We can actually keep this skb and reuse it,
997 * but that will make the prep logic too
998 * complex.
999 */
1000 dev_kfree_skb_irq(skb);
1001 vp->estats.rx_encaps_errors++;
1002 continue;
1003 }
1004 if (header_check > 0) {
1005 vp->estats.rx_csum_offload_good++;
1006 skb->ip_summed = CHECKSUM_UNNECESSARY;
1007 }
1008 }
1009 pskb_trim(skb,
1010 mmsg_vector->msg_len - vp->rx_header_size);
1011 skb->protocol = eth_type_trans(skb, skb->dev);
1012 /*
1013 * We do not need to lock on updating stats here
1014 * The interrupt loop is non-reentrant.
1015 */
1016 vp->dev->stats.rx_bytes += skb->len;
1017 vp->dev->stats.rx_packets++;
1018 napi_gro_receive(&vp->napi, skb);
1019 } else {
1020 /* Overlay header too short to do anything - discard.
1021 * We can actually keep this skb and reuse it,
1022 * but that will make the prep logic too complex.
1023 */
1024 if (skb != NULL)
1025 dev_kfree_skb_irq(skb);
1026 }
1027 (*skbuff_vector) = NULL;
1028 /* Move to the next buffer element */
1029 mmsg_vector++;
1030 skbuff_vector++;
1031 }
1032 if (packet_count > 0) {
1033 if (vp->estats.rx_queue_max < packet_count)
1034 vp->estats.rx_queue_max = packet_count;
1035 vp->estats.rx_queue_running_average =
1036 (vp->estats.rx_queue_running_average + packet_count) >> 1;
1037 }
1038 return packet_count;
1039}
1040
1041static int vector_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
1042{
1043 struct vector_private *vp = netdev_priv(dev);
1044 int queue_depth = 0;
1045
1046 if (vp->in_error) {
1047 deactivate_fd(vp->fds->rx_fd, vp->rx_irq);
1048 if ((vp->fds->rx_fd != vp->fds->tx_fd) && (vp->tx_irq != 0))
1049 deactivate_fd(vp->fds->tx_fd, vp->tx_irq);
1050 return NETDEV_TX_BUSY;
1051 }
1052
1053 if ((vp->options & VECTOR_TX) == 0) {
1054 writev_tx(vp, skb);
1055 return NETDEV_TX_OK;
1056 }
1057
1058 /* We do BQL only in the vector path, no point doing it in
1059 * packet at a time mode as there is no device queue
1060 */
1061
1062 netdev_sent_queue(vp->dev, skb->len);
1063 queue_depth = vector_enqueue(vp->tx_queue, skb);
1064
1065 if (queue_depth < vp->tx_queue->max_depth && netdev_xmit_more()) {
1066 mod_timer(&vp->tl, vp->coalesce);
1067 return NETDEV_TX_OK;
1068 } else {
1069 queue_depth = vector_send(vp->tx_queue);
1070 if (queue_depth > 0)
1071 napi_schedule(&vp->napi);
1072 }
1073
1074 return NETDEV_TX_OK;
1075}
1076
1077static irqreturn_t vector_rx_interrupt(int irq, void *dev_id)
1078{
1079 struct net_device *dev = dev_id;
1080 struct vector_private *vp = netdev_priv(dev);
1081
1082 if (!netif_running(dev))
1083 return IRQ_NONE;
1084 napi_schedule(&vp->napi);
1085 return IRQ_HANDLED;
1086
1087}
1088
1089static irqreturn_t vector_tx_interrupt(int irq, void *dev_id)
1090{
1091 struct net_device *dev = dev_id;
1092 struct vector_private *vp = netdev_priv(dev);
1093
1094 if (!netif_running(dev))
1095 return IRQ_NONE;
1096 /* We need to pay attention to it only if we got
1097 * -EAGAIN or -ENOBUFFS from sendmmsg. Otherwise
1098 * we ignore it. In the future, it may be worth
1099 * it to improve the IRQ controller a bit to make
1100 * tweaking the IRQ mask less costly
1101 */
1102
1103 napi_schedule(&vp->napi);
1104 return IRQ_HANDLED;
1105
1106}
1107
1108static int irq_rr;
1109
1110static int vector_net_close(struct net_device *dev)
1111{
1112 struct vector_private *vp = netdev_priv(dev);
1113
1114 netif_stop_queue(dev);
1115 del_timer(&vp->tl);
1116
1117 vp->opened = false;
1118
1119 if (vp->fds == NULL)
1120 return 0;
1121
1122 /* Disable and free all IRQS */
1123 if (vp->rx_irq > 0) {
1124 um_free_irq(vp->rx_irq, dev);
1125 vp->rx_irq = 0;
1126 }
1127 if (vp->tx_irq > 0) {
1128 um_free_irq(vp->tx_irq, dev);
1129 vp->tx_irq = 0;
1130 }
1131 napi_disable(&vp->napi);
1132 netif_napi_del(&vp->napi);
1133 if (vp->fds->rx_fd > 0) {
1134 if (vp->bpf)
1135 uml_vector_detach_bpf(vp->fds->rx_fd, vp->bpf);
1136 os_close_file(vp->fds->rx_fd);
1137 vp->fds->rx_fd = -1;
1138 }
1139 if (vp->fds->tx_fd > 0) {
1140 os_close_file(vp->fds->tx_fd);
1141 vp->fds->tx_fd = -1;
1142 }
1143 if (vp->bpf != NULL)
1144 kfree(vp->bpf->filter);
1145 kfree(vp->bpf);
1146 vp->bpf = NULL;
1147 kfree(vp->fds->remote_addr);
1148 kfree(vp->transport_data);
1149 kfree(vp->header_rxbuffer);
1150 kfree(vp->header_txbuffer);
1151 if (vp->rx_queue != NULL)
1152 destroy_queue(vp->rx_queue);
1153 if (vp->tx_queue != NULL)
1154 destroy_queue(vp->tx_queue);
1155 kfree(vp->fds);
1156 vp->fds = NULL;
1157 vp->in_error = false;
1158 return 0;
1159}
1160
1161static int vector_poll(struct napi_struct *napi, int budget)
1162{
1163 struct vector_private *vp = container_of(napi, struct vector_private, napi);
1164 int work_done = 0;
1165 int err;
1166 bool tx_enqueued = false;
1167
1168 if ((vp->options & VECTOR_TX) != 0)
1169 tx_enqueued = (vector_send(vp->tx_queue) > 0);
1170 spin_lock(&vp->rx_queue->head_lock);
1171 if ((vp->options & VECTOR_RX) > 0)
1172 err = vector_mmsg_rx(vp, budget);
1173 else {
1174 err = vector_legacy_rx(vp);
1175 if (err > 0)
1176 err = 1;
1177 }
1178 spin_unlock(&vp->rx_queue->head_lock);
1179 if (err > 0)
1180 work_done += err;
1181
1182 if (tx_enqueued || err > 0)
1183 napi_schedule(napi);
1184 if (work_done <= budget)
1185 napi_complete_done(napi, work_done);
1186 return work_done;
1187}
1188
1189static void vector_reset_tx(struct work_struct *work)
1190{
1191 struct vector_private *vp =
1192 container_of(work, struct vector_private, reset_tx);
1193 netdev_reset_queue(vp->dev);
1194 netif_start_queue(vp->dev);
1195 netif_wake_queue(vp->dev);
1196}
1197
1198static int vector_net_open(struct net_device *dev)
1199{
1200 struct vector_private *vp = netdev_priv(dev);
1201 int err = -EINVAL;
1202 struct vector_device *vdevice;
1203
1204 if (vp->opened)
1205 return -ENXIO;
1206 vp->opened = true;
1207
1208 vp->bpf = uml_vector_user_bpf(get_bpf_file(vp->parsed));
1209
1210 vp->fds = uml_vector_user_open(vp->unit, vp->parsed);
1211
1212 if (vp->fds == NULL)
1213 goto out_close;
1214
1215 if (build_transport_data(vp) < 0)
1216 goto out_close;
1217
1218 if ((vp->options & VECTOR_RX) > 0) {
1219 vp->rx_queue = create_queue(
1220 vp,
1221 get_depth(vp->parsed),
1222 vp->rx_header_size,
1223 MAX_IOV_SIZE
1224 );
1225 atomic_set(&vp->rx_queue->queue_depth, get_depth(vp->parsed));
1226 } else {
1227 vp->header_rxbuffer = kmalloc(
1228 vp->rx_header_size,
1229 GFP_KERNEL
1230 );
1231 if (vp->header_rxbuffer == NULL)
1232 goto out_close;
1233 }
1234 if ((vp->options & VECTOR_TX) > 0) {
1235 vp->tx_queue = create_queue(
1236 vp,
1237 get_depth(vp->parsed),
1238 vp->header_size,
1239 MAX_IOV_SIZE
1240 );
1241 } else {
1242 vp->header_txbuffer = kmalloc(vp->header_size, GFP_KERNEL);
1243 if (vp->header_txbuffer == NULL)
1244 goto out_close;
1245 }
1246
1247 netif_napi_add_weight(vp->dev, &vp->napi, vector_poll,
1248 get_depth(vp->parsed));
1249 napi_enable(&vp->napi);
1250
1251 /* READ IRQ */
1252 err = um_request_irq(
1253 irq_rr + VECTOR_BASE_IRQ, vp->fds->rx_fd,
1254 IRQ_READ, vector_rx_interrupt,
1255 IRQF_SHARED, dev->name, dev);
1256 if (err < 0) {
1257 netdev_err(dev, "vector_open: failed to get rx irq(%d)\n", err);
1258 err = -ENETUNREACH;
1259 goto out_close;
1260 }
1261 vp->rx_irq = irq_rr + VECTOR_BASE_IRQ;
1262 dev->irq = irq_rr + VECTOR_BASE_IRQ;
1263 irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
1264
1265 /* WRITE IRQ - we need it only if we have vector TX */
1266 if ((vp->options & VECTOR_TX) > 0) {
1267 err = um_request_irq(
1268 irq_rr + VECTOR_BASE_IRQ, vp->fds->tx_fd,
1269 IRQ_WRITE, vector_tx_interrupt,
1270 IRQF_SHARED, dev->name, dev);
1271 if (err < 0) {
1272 netdev_err(dev,
1273 "vector_open: failed to get tx irq(%d)\n", err);
1274 err = -ENETUNREACH;
1275 goto out_close;
1276 }
1277 vp->tx_irq = irq_rr + VECTOR_BASE_IRQ;
1278 irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
1279 }
1280
1281 if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
1282 if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
1283 vp->options |= VECTOR_BPF;
1284 }
1285 if (((vp->options & VECTOR_BPF) != 0) && (vp->bpf == NULL))
1286 vp->bpf = uml_vector_default_bpf(dev->dev_addr);
1287
1288 if (vp->bpf != NULL)
1289 uml_vector_attach_bpf(vp->fds->rx_fd, vp->bpf);
1290
1291 netif_start_queue(dev);
1292 vector_reset_stats(vp);
1293
1294 /* clear buffer - it can happen that the host side of the interface
1295 * is full when we get here. In this case, new data is never queued,
1296 * SIGIOs never arrive, and the net never works.
1297 */
1298
1299 napi_schedule(&vp->napi);
1300
1301 vdevice = find_device(vp->unit);
1302 vdevice->opened = 1;
1303
1304 if ((vp->options & VECTOR_TX) != 0)
1305 add_timer(&vp->tl);
1306 return 0;
1307out_close:
1308 vector_net_close(dev);
1309 return err;
1310}
1311
1312
1313static void vector_net_set_multicast_list(struct net_device *dev)
1314{
1315 /* TODO: - we can do some BPF games here */
1316 return;
1317}
1318
1319static void vector_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
1320{
1321 struct vector_private *vp = netdev_priv(dev);
1322
1323 vp->estats.tx_timeout_count++;
1324 netif_trans_update(dev);
1325 schedule_work(&vp->reset_tx);
1326}
1327
1328static netdev_features_t vector_fix_features(struct net_device *dev,
1329 netdev_features_t features)
1330{
1331 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
1332 return features;
1333}
1334
1335static int vector_set_features(struct net_device *dev,
1336 netdev_features_t features)
1337{
1338 struct vector_private *vp = netdev_priv(dev);
1339 /* Adjust buffer sizes for GSO/GRO. Unfortunately, there is
1340 * no way to negotiate it on raw sockets, so we can change
1341 * only our side.
1342 */
1343 if (features & NETIF_F_GRO)
1344 /* All new frame buffers will be GRO-sized */
1345 vp->req_size = 65536;
1346 else
1347 /* All new frame buffers will be normal sized */
1348 vp->req_size = vp->max_packet + vp->headroom + SAFETY_MARGIN;
1349 return 0;
1350}
1351
1352#ifdef CONFIG_NET_POLL_CONTROLLER
1353static void vector_net_poll_controller(struct net_device *dev)
1354{
1355 disable_irq(dev->irq);
1356 vector_rx_interrupt(dev->irq, dev);
1357 enable_irq(dev->irq);
1358}
1359#endif
1360
1361static void vector_net_get_drvinfo(struct net_device *dev,
1362 struct ethtool_drvinfo *info)
1363{
1364 strscpy(info->driver, DRIVER_NAME);
1365}
1366
1367static int vector_net_load_bpf_flash(struct net_device *dev,
1368 struct ethtool_flash *efl)
1369{
1370 struct vector_private *vp = netdev_priv(dev);
1371 struct vector_device *vdevice;
1372 const struct firmware *fw;
1373 int result = 0;
1374
1375 if (!(vp->options & VECTOR_BPF_FLASH)) {
1376 netdev_err(dev, "loading firmware not permitted: %s\n", efl->data);
1377 return -1;
1378 }
1379
1380 if (vp->bpf != NULL) {
1381 if (vp->opened)
1382 uml_vector_detach_bpf(vp->fds->rx_fd, vp->bpf);
1383 kfree(vp->bpf->filter);
1384 vp->bpf->filter = NULL;
1385 } else {
1386 vp->bpf = kmalloc(sizeof(struct sock_fprog), GFP_ATOMIC);
1387 if (vp->bpf == NULL) {
1388 netdev_err(dev, "failed to allocate memory for firmware\n");
1389 goto flash_fail;
1390 }
1391 }
1392
1393 vdevice = find_device(vp->unit);
1394
1395 if (request_firmware(&fw, efl->data, &vdevice->pdev.dev))
1396 goto flash_fail;
1397
1398 vp->bpf->filter = kmemdup(fw->data, fw->size, GFP_ATOMIC);
1399 if (!vp->bpf->filter)
1400 goto free_buffer;
1401
1402 vp->bpf->len = fw->size / sizeof(struct sock_filter);
1403 release_firmware(fw);
1404
1405 if (vp->opened)
1406 result = uml_vector_attach_bpf(vp->fds->rx_fd, vp->bpf);
1407
1408 return result;
1409
1410free_buffer:
1411 release_firmware(fw);
1412
1413flash_fail:
1414 if (vp->bpf != NULL)
1415 kfree(vp->bpf->filter);
1416 kfree(vp->bpf);
1417 vp->bpf = NULL;
1418 return -1;
1419}
1420
1421static void vector_get_ringparam(struct net_device *netdev,
1422 struct ethtool_ringparam *ring,
1423 struct kernel_ethtool_ringparam *kernel_ring,
1424 struct netlink_ext_ack *extack)
1425{
1426 struct vector_private *vp = netdev_priv(netdev);
1427
1428 ring->rx_max_pending = vp->rx_queue->max_depth;
1429 ring->tx_max_pending = vp->tx_queue->max_depth;
1430 ring->rx_pending = vp->rx_queue->max_depth;
1431 ring->tx_pending = vp->tx_queue->max_depth;
1432}
1433
1434static void vector_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
1435{
1436 switch (stringset) {
1437 case ETH_SS_TEST:
1438 *buf = '\0';
1439 break;
1440 case ETH_SS_STATS:
1441 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
1442 break;
1443 default:
1444 WARN_ON(1);
1445 break;
1446 }
1447}
1448
1449static int vector_get_sset_count(struct net_device *dev, int sset)
1450{
1451 switch (sset) {
1452 case ETH_SS_TEST:
1453 return 0;
1454 case ETH_SS_STATS:
1455 return VECTOR_NUM_STATS;
1456 default:
1457 return -EOPNOTSUPP;
1458 }
1459}
1460
1461static void vector_get_ethtool_stats(struct net_device *dev,
1462 struct ethtool_stats *estats,
1463 u64 *tmp_stats)
1464{
1465 struct vector_private *vp = netdev_priv(dev);
1466
1467 /* Stats are modified in the dequeue portions of
1468 * rx/tx which are protected by the head locks
1469 * grabbing these locks here ensures they are up
1470 * to date.
1471 */
1472
1473 spin_lock(&vp->tx_queue->head_lock);
1474 spin_lock(&vp->rx_queue->head_lock);
1475 memcpy(tmp_stats, &vp->estats, sizeof(struct vector_estats));
1476 spin_unlock(&vp->rx_queue->head_lock);
1477 spin_unlock(&vp->tx_queue->head_lock);
1478}
1479
1480static int vector_get_coalesce(struct net_device *netdev,
1481 struct ethtool_coalesce *ec,
1482 struct kernel_ethtool_coalesce *kernel_coal,
1483 struct netlink_ext_ack *extack)
1484{
1485 struct vector_private *vp = netdev_priv(netdev);
1486
1487 ec->tx_coalesce_usecs = (vp->coalesce * 1000000) / HZ;
1488 return 0;
1489}
1490
1491static int vector_set_coalesce(struct net_device *netdev,
1492 struct ethtool_coalesce *ec,
1493 struct kernel_ethtool_coalesce *kernel_coal,
1494 struct netlink_ext_ack *extack)
1495{
1496 struct vector_private *vp = netdev_priv(netdev);
1497
1498 vp->coalesce = (ec->tx_coalesce_usecs * HZ) / 1000000;
1499 if (vp->coalesce == 0)
1500 vp->coalesce = 1;
1501 return 0;
1502}
1503
1504static const struct ethtool_ops vector_net_ethtool_ops = {
1505 .supported_coalesce_params = ETHTOOL_COALESCE_TX_USECS,
1506 .get_drvinfo = vector_net_get_drvinfo,
1507 .get_link = ethtool_op_get_link,
1508 .get_ts_info = ethtool_op_get_ts_info,
1509 .get_ringparam = vector_get_ringparam,
1510 .get_strings = vector_get_strings,
1511 .get_sset_count = vector_get_sset_count,
1512 .get_ethtool_stats = vector_get_ethtool_stats,
1513 .get_coalesce = vector_get_coalesce,
1514 .set_coalesce = vector_set_coalesce,
1515 .flash_device = vector_net_load_bpf_flash,
1516};
1517
1518
1519static const struct net_device_ops vector_netdev_ops = {
1520 .ndo_open = vector_net_open,
1521 .ndo_stop = vector_net_close,
1522 .ndo_start_xmit = vector_net_start_xmit,
1523 .ndo_set_rx_mode = vector_net_set_multicast_list,
1524 .ndo_tx_timeout = vector_net_tx_timeout,
1525 .ndo_set_mac_address = eth_mac_addr,
1526 .ndo_validate_addr = eth_validate_addr,
1527 .ndo_fix_features = vector_fix_features,
1528 .ndo_set_features = vector_set_features,
1529#ifdef CONFIG_NET_POLL_CONTROLLER
1530 .ndo_poll_controller = vector_net_poll_controller,
1531#endif
1532};
1533
1534static void vector_timer_expire(struct timer_list *t)
1535{
1536 struct vector_private *vp = from_timer(vp, t, tl);
1537
1538 vp->estats.tx_kicks++;
1539 napi_schedule(&vp->napi);
1540}
1541
1542
1543
1544static void vector_eth_configure(
1545 int n,
1546 struct arglist *def
1547 )
1548{
1549 struct vector_device *device;
1550 struct net_device *dev;
1551 struct vector_private *vp;
1552 int err;
1553
1554 device = kzalloc(sizeof(*device), GFP_KERNEL);
1555 if (device == NULL) {
1556 printk(KERN_ERR "eth_configure failed to allocate struct "
1557 "vector_device\n");
1558 return;
1559 }
1560 dev = alloc_etherdev(sizeof(struct vector_private));
1561 if (dev == NULL) {
1562 printk(KERN_ERR "eth_configure: failed to allocate struct "
1563 "net_device for vec%d\n", n);
1564 goto out_free_device;
1565 }
1566
1567 dev->mtu = get_mtu(def);
1568
1569 INIT_LIST_HEAD(&device->list);
1570 device->unit = n;
1571
1572 /* If this name ends up conflicting with an existing registered
1573 * netdevice, that is OK, register_netdev{,ice}() will notice this
1574 * and fail.
1575 */
1576 snprintf(dev->name, sizeof(dev->name), "vec%d", n);
1577 uml_net_setup_etheraddr(dev, uml_vector_fetch_arg(def, "mac"));
1578 vp = netdev_priv(dev);
1579
1580 /* sysfs register */
1581 if (!driver_registered) {
1582 platform_driver_register(¨_net_driver);
1583 driver_registered = 1;
1584 }
1585 device->pdev.id = n;
1586 device->pdev.name = DRIVER_NAME;
1587 device->pdev.dev.release = vector_device_release;
1588 dev_set_drvdata(&device->pdev.dev, device);
1589 if (platform_device_register(&device->pdev))
1590 goto out_free_netdev;
1591 SET_NETDEV_DEV(dev, &device->pdev.dev);
1592
1593 device->dev = dev;
1594
1595 *vp = ((struct vector_private)
1596 {
1597 .list = LIST_HEAD_INIT(vp->list),
1598 .dev = dev,
1599 .unit = n,
1600 .options = get_transport_options(def),
1601 .rx_irq = 0,
1602 .tx_irq = 0,
1603 .parsed = def,
1604 .max_packet = get_mtu(def) + ETH_HEADER_OTHER,
1605 /* TODO - we need to calculate headroom so that ip header
1606 * is 16 byte aligned all the time
1607 */
1608 .headroom = get_headroom(def),
1609 .form_header = NULL,
1610 .verify_header = NULL,
1611 .header_rxbuffer = NULL,
1612 .header_txbuffer = NULL,
1613 .header_size = 0,
1614 .rx_header_size = 0,
1615 .rexmit_scheduled = false,
1616 .opened = false,
1617 .transport_data = NULL,
1618 .in_write_poll = false,
1619 .coalesce = 2,
1620 .req_size = get_req_size(def),
1621 .in_error = false,
1622 .bpf = NULL
1623 });
1624
1625 dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST);
1626 INIT_WORK(&vp->reset_tx, vector_reset_tx);
1627
1628 timer_setup(&vp->tl, vector_timer_expire, 0);
1629
1630 /* FIXME */
1631 dev->netdev_ops = &vector_netdev_ops;
1632 dev->ethtool_ops = &vector_net_ethtool_ops;
1633 dev->watchdog_timeo = (HZ >> 1);
1634 /* primary IRQ - fixme */
1635 dev->irq = 0; /* we will adjust this once opened */
1636
1637 rtnl_lock();
1638 err = register_netdevice(dev);
1639 rtnl_unlock();
1640 if (err)
1641 goto out_undo_user_init;
1642
1643 spin_lock(&vector_devices_lock);
1644 list_add(&device->list, &vector_devices);
1645 spin_unlock(&vector_devices_lock);
1646
1647 return;
1648
1649out_undo_user_init:
1650 return;
1651out_free_netdev:
1652 free_netdev(dev);
1653out_free_device:
1654 kfree(device);
1655}
1656
1657
1658
1659
1660/*
1661 * Invoked late in the init
1662 */
1663
1664static int __init vector_init(void)
1665{
1666 struct list_head *ele;
1667 struct vector_cmd_line_arg *def;
1668 struct arglist *parsed;
1669
1670 list_for_each(ele, &vec_cmd_line) {
1671 def = list_entry(ele, struct vector_cmd_line_arg, list);
1672 parsed = uml_parse_vector_ifspec(def->arguments);
1673 if (parsed != NULL)
1674 vector_eth_configure(def->unit, parsed);
1675 }
1676 return 0;
1677}
1678
1679
1680/* Invoked at initial argument parsing, only stores
1681 * arguments until a proper vector_init is called
1682 * later
1683 */
1684
1685static int __init vector_setup(char *str)
1686{
1687 char *error;
1688 int n, err;
1689 struct vector_cmd_line_arg *new;
1690
1691 err = vector_parse(str, &n, &str, &error);
1692 if (err) {
1693 printk(KERN_ERR "vector_setup - Couldn't parse '%s' : %s\n",
1694 str, error);
1695 return 1;
1696 }
1697 new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
1698 if (!new)
1699 panic("%s: Failed to allocate %zu bytes\n", __func__,
1700 sizeof(*new));
1701 INIT_LIST_HEAD(&new->list);
1702 new->unit = n;
1703 new->arguments = str;
1704 list_add_tail(&new->list, &vec_cmd_line);
1705 return 1;
1706}
1707
1708__setup("vec", vector_setup);
1709__uml_help(vector_setup,
1710"vec[0-9]+:<option>=<value>,<option>=<value>\n"
1711" Configure a vector io network device.\n\n"
1712);
1713
1714late_initcall(vector_init);
1715
1716static struct mc_device vector_mc = {
1717 .list = LIST_HEAD_INIT(vector_mc.list),
1718 .name = "vec",
1719 .config = vector_config,
1720 .get_config = NULL,
1721 .id = vector_id,
1722 .remove = vector_remove,
1723};
1724
1725#ifdef CONFIG_INET
1726static int vector_inetaddr_event(
1727 struct notifier_block *this,
1728 unsigned long event,
1729 void *ptr)
1730{
1731 return NOTIFY_DONE;
1732}
1733
1734static struct notifier_block vector_inetaddr_notifier = {
1735 .notifier_call = vector_inetaddr_event,
1736};
1737
1738static void inet_register(void)
1739{
1740 register_inetaddr_notifier(&vector_inetaddr_notifier);
1741}
1742#else
1743static inline void inet_register(void)
1744{
1745}
1746#endif
1747
1748static int vector_net_init(void)
1749{
1750 mconsole_register_dev(&vector_mc);
1751 inet_register();
1752 return 0;
1753}
1754
1755__initcall(vector_net_init);
1756
1757
1758