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authorAaron Young <aaron.young@oracle.com>2016-03-15 14:35:37 -0400
committerDavid S. Miller <davem@davemloft.net>2016-03-18 19:33:00 -0400
commit31762eaa0d0804d34e297daad57cda45cbc6c961 (patch)
treede95945195c02d0f9e89bb343bd42c163032638d
parent1e6bb1a3540fec3ef112b9a89dda88e684c3ff59 (diff)
ldmvsw: Split sunvnet driver into common code
Split sunvnet.c into sunvnet.c and sunvnet_common.c. Details: Since the sunvnet and ldmvsw drivers will both use common sunvnet code, move the functions (and support functions) anticipated to be common code from sunvnet.c to sunvnet_common.c. Similarly, sunvnet.h was renamed to sunvnet_common.h. The sunvnet_common.c code will be compiled into the kernel and act as a library of functions that are linked by either (or both) drivers when loaded. Function names for external functions in sunvnet_common.c (to be called by both the sunvnet and ldmvsw drivers) were tagged with a "_common" suffix to clearly designate them as common functions. No functional changes as of yet... just moved code verbatim to the new sunvnet_common.c/h files. Makefile/Kconfig support added to build sunvnet_common.c file. The code is included in the kernel if SUN_LDOMS is defined/selected. NOTE - per the SubmittingPatches documentation, since the code was just moved from one file another, the code was NOT checkpatch'd in this commit to aid in review. Signed-off-by: Aaron Young <aaron.young@oracle.com> Signed-off-by: Rashmi Narasimhan <rashmi.narasimhan@oracle.com> Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Reviewed-by: Alexandre Chartre <Alexandre.Chartre@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat
-rw-r--r--drivers/net/ethernet/sun/Kconfig5
-rw-r--r--drivers/net/ethernet/sun/Makefile1
-rw-r--r--drivers/net/ethernet/sun/sunvnet.c1755
-rw-r--r--drivers/net/ethernet/sun/sunvnet_common.c1753
-rw-r--r--drivers/net/ethernet/sun/sunvnet_common.h (renamed from drivers/net/ethernet/sun/sunvnet.h)45
5 files changed, 1816 insertions, 1743 deletions
diff --git a/drivers/net/ethernet/sun/Kconfig b/drivers/net/ethernet/sun/Kconfig
index dee94b67638c..aa58c11ea6db 100644
--- a/drivers/net/ethernet/sun/Kconfig
+++ b/drivers/net/ethernet/sun/Kconfig
@@ -69,6 +69,11 @@ config CASSINI
69 Support for the Sun Cassini chip, aka Sun GigaSwift Ethernet. See also 69 Support for the Sun Cassini chip, aka Sun GigaSwift Ethernet. See also
70 <http://docs.oracle.com/cd/E19113-01/giga.ether.pci/817-4341-10/817-4341-10.pdf>. 70 <http://docs.oracle.com/cd/E19113-01/giga.ether.pci/817-4341-10/817-4341-10.pdf>.
71 71
72config SUNVNET_COMMON
73 bool
74 depends on SUN_LDOMS
75 default y if SUN_LDOMS
76
72config SUNVNET 77config SUNVNET
73 tristate "Sun Virtual Network support" 78 tristate "Sun Virtual Network support"
74 depends on SUN_LDOMS 79 depends on SUN_LDOMS
diff --git a/drivers/net/ethernet/sun/Makefile b/drivers/net/ethernet/sun/Makefile
index 1e620ff88eba..7b622aa14c5b 100644
--- a/drivers/net/ethernet/sun/Makefile
+++ b/drivers/net/ethernet/sun/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_SUNQE) += sunqe.o
7obj-$(CONFIG_SUNBMAC) += sunbmac.o 7obj-$(CONFIG_SUNBMAC) += sunbmac.o
8obj-$(CONFIG_SUNGEM) += sungem.o 8obj-$(CONFIG_SUNGEM) += sungem.o
9obj-$(CONFIG_CASSINI) += cassini.o 9obj-$(CONFIG_CASSINI) += cassini.o
10obj-$(CONFIG_SUNVNET_COMMON) += sunvnet_common.o
10obj-$(CONFIG_SUNVNET) += sunvnet.o 11obj-$(CONFIG_SUNVNET) += sunvnet.o
11obj-$(CONFIG_NIU) += niu.o 12obj-$(CONFIG_NIU) += niu.o
diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 942a95db2061..5b9113524188 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -17,8 +17,6 @@
17#include <linux/mutex.h> 17#include <linux/mutex.h>
18#include <linux/highmem.h> 18#include <linux/highmem.h>
19#include <linux/if_vlan.h> 19#include <linux/if_vlan.h>
20#define CREATE_TRACE_POINTS
21#include <trace/events/sunvnet.h>
22 20
23#if IS_ENABLED(CONFIG_IPV6) 21#if IS_ENABLED(CONFIG_IPV6)
24#include <linux/icmpv6.h> 22#include <linux/icmpv6.h>
@@ -31,7 +29,12 @@
31#include <asm/vio.h> 29#include <asm/vio.h>
32#include <asm/ldc.h> 30#include <asm/ldc.h>
33 31
34#include "sunvnet.h" 32#include "sunvnet_common.h"
33
34/* length of time before we decide the hardware is borked,
35 * and dev->tx_timeout() should be called to fix the problem
36 */
37#define VNET_TX_TIMEOUT (5 * HZ)
35 38
36#define DRV_MODULE_NAME "sunvnet" 39#define DRV_MODULE_NAME "sunvnet"
37#define DRV_MODULE_VERSION "1.0" 40#define DRV_MODULE_VERSION "1.0"
@@ -44,16 +47,6 @@ MODULE_DESCRIPTION("Sun LDOM virtual network driver");
44MODULE_LICENSE("GPL"); 47MODULE_LICENSE("GPL");
45MODULE_VERSION(DRV_MODULE_VERSION); 48MODULE_VERSION(DRV_MODULE_VERSION);
46 49
47#define VNET_MAX_TXQS 16
48
49/* Heuristic for the number of times to exponentially backoff and
50 * retry sending an LDC trigger when EAGAIN is encountered
51 */
52#define VNET_MAX_RETRIES 10
53
54static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
55static void vnet_port_reset(struct vnet_port *port);
56
57/* Ordered from largest major to lowest */ 50/* Ordered from largest major to lowest */
58static struct vio_version vnet_versions[] = { 51static struct vio_version vnet_versions[] = {
59 { .major = 1, .minor = 8 }, 52 { .major = 1, .minor = 8 },
@@ -62,1578 +55,6 @@ static struct vio_version vnet_versions[] = {
62 { .major = 1, .minor = 0 }, 55 { .major = 1, .minor = 0 },
63}; 56};
64 57
65static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
66{
67 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
68}
69
70static int vnet_handle_unknown(struct vnet_port *port, void *arg)
71{
72 struct vio_msg_tag *pkt = arg;
73
74 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
75 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
76 pr_err("Resetting connection\n");
77
78 ldc_disconnect(port->vio.lp);
79
80 return -ECONNRESET;
81}
82
83static int vnet_port_alloc_tx_ring(struct vnet_port *port);
84
85static int vnet_send_attr(struct vio_driver_state *vio)
86{
87 struct vnet_port *port = to_vnet_port(vio);
88 struct net_device *dev = port->vp->dev;
89 struct vio_net_attr_info pkt;
90 int framelen = ETH_FRAME_LEN;
91 int i, err;
92
93 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
94 if (err)
95 return err;
96
97 memset(&pkt, 0, sizeof(pkt));
98 pkt.tag.type = VIO_TYPE_CTRL;
99 pkt.tag.stype = VIO_SUBTYPE_INFO;
100 pkt.tag.stype_env = VIO_ATTR_INFO;
101 pkt.tag.sid = vio_send_sid(vio);
102 if (vio_version_before(vio, 1, 2))
103 pkt.xfer_mode = VIO_DRING_MODE;
104 else
105 pkt.xfer_mode = VIO_NEW_DRING_MODE;
106 pkt.addr_type = VNET_ADDR_ETHERMAC;
107 pkt.ack_freq = 0;
108 for (i = 0; i < 6; i++)
109 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
110 if (vio_version_after(vio, 1, 3)) {
111 if (port->rmtu) {
112 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
113 pkt.mtu = port->rmtu;
114 } else {
115 port->rmtu = VNET_MAXPACKET;
116 pkt.mtu = port->rmtu;
117 }
118 if (vio_version_after_eq(vio, 1, 6))
119 pkt.options = VIO_TX_DRING;
120 } else if (vio_version_before(vio, 1, 3)) {
121 pkt.mtu = framelen;
122 } else { /* v1.3 */
123 pkt.mtu = framelen + VLAN_HLEN;
124 }
125
126 pkt.cflags = 0;
127 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
128 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
129 if (!port->tsolen)
130 port->tsolen = VNET_MAXTSO;
131 pkt.ipv4_lso_maxlen = port->tsolen;
132 }
133
134 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
135
136 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
137 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
138 "cflags[0x%04x] lso_max[%u]\n",
139 pkt.xfer_mode, pkt.addr_type,
140 (unsigned long long)pkt.addr,
141 pkt.ack_freq, pkt.plnk_updt, pkt.options,
142 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
143
144
145 return vio_ldc_send(vio, &pkt, sizeof(pkt));
146}
147
148static int handle_attr_info(struct vio_driver_state *vio,
149 struct vio_net_attr_info *pkt)
150{
151 struct vnet_port *port = to_vnet_port(vio);
152 u64 localmtu;
153 u8 xfer_mode;
154
155 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
156 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
157 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
158 pkt->xfer_mode, pkt->addr_type,
159 (unsigned long long)pkt->addr,
160 pkt->ack_freq, pkt->plnk_updt, pkt->options,
161 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
162 pkt->ipv4_lso_maxlen);
163
164 pkt->tag.sid = vio_send_sid(vio);
165
166 xfer_mode = pkt->xfer_mode;
167 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
168 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
169 xfer_mode = VIO_NEW_DRING_MODE;
170
171 /* MTU negotiation:
172 * < v1.3 - ETH_FRAME_LEN exactly
173 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
174 * pkt->mtu for ACK
175 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
176 */
177 if (vio_version_before(vio, 1, 3)) {
178 localmtu = ETH_FRAME_LEN;
179 } else if (vio_version_after(vio, 1, 3)) {
180 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
181 localmtu = min(pkt->mtu, localmtu);
182 pkt->mtu = localmtu;
183 } else { /* v1.3 */
184 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
185 }
186 port->rmtu = localmtu;
187
188 /* LSO negotiation */
189 if (vio_version_after_eq(vio, 1, 7))
190 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
191 else
192 port->tso = false;
193 if (port->tso) {
194 if (!port->tsolen)
195 port->tsolen = VNET_MAXTSO;
196 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
197 if (port->tsolen < VNET_MINTSO) {
198 port->tso = false;
199 port->tsolen = 0;
200 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
201 }
202 pkt->ipv4_lso_maxlen = port->tsolen;
203 } else {
204 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
205 pkt->ipv4_lso_maxlen = 0;
206 }
207
208 /* for version >= 1.6, ACK packet mode we support */
209 if (vio_version_after_eq(vio, 1, 6)) {
210 pkt->xfer_mode = VIO_NEW_DRING_MODE;
211 pkt->options = VIO_TX_DRING;
212 }
213
214 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
215 pkt->addr_type != VNET_ADDR_ETHERMAC ||
216 pkt->mtu != localmtu) {
217 viodbg(HS, "SEND NET ATTR NACK\n");
218
219 pkt->tag.stype = VIO_SUBTYPE_NACK;
220
221 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
222
223 return -ECONNRESET;
224 } else {
225 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
226 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
227 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
228 pkt->xfer_mode, pkt->addr_type,
229 (unsigned long long)pkt->addr,
230 pkt->ack_freq, pkt->plnk_updt, pkt->options,
231 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
232 pkt->ipv4_lso_maxlen);
233
234 pkt->tag.stype = VIO_SUBTYPE_ACK;
235
236 return vio_ldc_send(vio, pkt, sizeof(*pkt));
237 }
238
239}
240
241static int handle_attr_ack(struct vio_driver_state *vio,
242 struct vio_net_attr_info *pkt)
243{
244 viodbg(HS, "GOT NET ATTR ACK\n");
245
246 return 0;
247}
248
249static int handle_attr_nack(struct vio_driver_state *vio,
250 struct vio_net_attr_info *pkt)
251{
252 viodbg(HS, "GOT NET ATTR NACK\n");
253
254 return -ECONNRESET;
255}
256
257static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
258{
259 struct vio_net_attr_info *pkt = arg;
260
261 switch (pkt->tag.stype) {
262 case VIO_SUBTYPE_INFO:
263 return handle_attr_info(vio, pkt);
264
265 case VIO_SUBTYPE_ACK:
266 return handle_attr_ack(vio, pkt);
267
268 case VIO_SUBTYPE_NACK:
269 return handle_attr_nack(vio, pkt);
270
271 default:
272 return -ECONNRESET;
273 }
274}
275
276static void vnet_handshake_complete(struct vio_driver_state *vio)
277{
278 struct vio_dring_state *dr;
279
280 dr = &vio->drings[VIO_DRIVER_RX_RING];
281 dr->snd_nxt = dr->rcv_nxt = 1;
282
283 dr = &vio->drings[VIO_DRIVER_TX_RING];
284 dr->snd_nxt = dr->rcv_nxt = 1;
285}
286
287/* The hypervisor interface that implements copying to/from imported
288 * memory from another domain requires that copies are done to 8-byte
289 * aligned buffers, and that the lengths of such copies are also 8-byte
290 * multiples.
291 *
292 * So we align skb->data to an 8-byte multiple and pad-out the data
293 * area so we can round the copy length up to the next multiple of
294 * 8 for the copy.
295 *
296 * The transmitter puts the actual start of the packet 6 bytes into
297 * the buffer it sends over, so that the IP headers after the ethernet
298 * header are aligned properly. These 6 bytes are not in the descriptor
299 * length, they are simply implied. This offset is represented using
300 * the VNET_PACKET_SKIP macro.
301 */
302static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
303 unsigned int len)
304{
305 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
306 unsigned long addr, off;
307
308 if (unlikely(!skb))
309 return NULL;
310
311 addr = (unsigned long) skb->data;
312 off = ((addr + 7UL) & ~7UL) - addr;
313 if (off)
314 skb_reserve(skb, off);
315
316 return skb;
317}
318
319static inline void vnet_fullcsum(struct sk_buff *skb)
320{
321 struct iphdr *iph = ip_hdr(skb);
322 int offset = skb_transport_offset(skb);
323
324 if (skb->protocol != htons(ETH_P_IP))
325 return;
326 if (iph->protocol != IPPROTO_TCP &&
327 iph->protocol != IPPROTO_UDP)
328 return;
329 skb->ip_summed = CHECKSUM_NONE;
330 skb->csum_level = 1;
331 skb->csum = 0;
332 if (iph->protocol == IPPROTO_TCP) {
333 struct tcphdr *ptcp = tcp_hdr(skb);
334
335 ptcp->check = 0;
336 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
337 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
338 skb->len - offset, IPPROTO_TCP,
339 skb->csum);
340 } else if (iph->protocol == IPPROTO_UDP) {
341 struct udphdr *pudp = udp_hdr(skb);
342
343 pudp->check = 0;
344 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
345 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
346 skb->len - offset, IPPROTO_UDP,
347 skb->csum);
348 }
349}
350
351static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
352{
353 struct net_device *dev = port->vp->dev;
354 unsigned int len = desc->size;
355 unsigned int copy_len;
356 struct sk_buff *skb;
357 int maxlen;
358 int err;
359
360 err = -EMSGSIZE;
361 if (port->tso && port->tsolen > port->rmtu)
362 maxlen = port->tsolen;
363 else
364 maxlen = port->rmtu;
365 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
366 dev->stats.rx_length_errors++;
367 goto out_dropped;
368 }
369
370 skb = alloc_and_align_skb(dev, len);
371 err = -ENOMEM;
372 if (unlikely(!skb)) {
373 dev->stats.rx_missed_errors++;
374 goto out_dropped;
375 }
376
377 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
378 skb_put(skb, copy_len);
379 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
380 skb->data, copy_len, 0,
381 desc->cookies, desc->ncookies);
382 if (unlikely(err < 0)) {
383 dev->stats.rx_frame_errors++;
384 goto out_free_skb;
385 }
386
387 skb_pull(skb, VNET_PACKET_SKIP);
388 skb_trim(skb, len);
389 skb->protocol = eth_type_trans(skb, dev);
390
391 if (vio_version_after_eq(&port->vio, 1, 8)) {
392 struct vio_net_dext *dext = vio_net_ext(desc);
393
394 skb_reset_network_header(skb);
395
396 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
397 if (skb->protocol == ETH_P_IP) {
398 struct iphdr *iph = ip_hdr(skb);
399
400 iph->check = 0;
401 ip_send_check(iph);
402 }
403 }
404 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
405 skb->ip_summed == CHECKSUM_NONE) {
406 if (skb->protocol == htons(ETH_P_IP)) {
407 struct iphdr *iph = ip_hdr(skb);
408 int ihl = iph->ihl * 4;
409
410 skb_reset_transport_header(skb);
411 skb_set_transport_header(skb, ihl);
412 vnet_fullcsum(skb);
413 }
414 }
415 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
416 skb->ip_summed = CHECKSUM_PARTIAL;
417 skb->csum_level = 0;
418 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
419 skb->csum_level = 1;
420 }
421 }
422
423 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
424
425 dev->stats.rx_packets++;
426 dev->stats.rx_bytes += len;
427 napi_gro_receive(&port->napi, skb);
428 return 0;
429
430out_free_skb:
431 kfree_skb(skb);
432
433out_dropped:
434 dev->stats.rx_dropped++;
435 return err;
436}
437
438static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
439 u32 start, u32 end, u8 vio_dring_state)
440{
441 struct vio_dring_data hdr = {
442 .tag = {
443 .type = VIO_TYPE_DATA,
444 .stype = VIO_SUBTYPE_ACK,
445 .stype_env = VIO_DRING_DATA,
446 .sid = vio_send_sid(&port->vio),
447 },
448 .dring_ident = dr->ident,
449 .start_idx = start,
450 .end_idx = end,
451 .state = vio_dring_state,
452 };
453 int err, delay;
454 int retries = 0;
455
456 hdr.seq = dr->snd_nxt;
457 delay = 1;
458 do {
459 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
460 if (err > 0) {
461 dr->snd_nxt++;
462 break;
463 }
464 udelay(delay);
465 if ((delay <<= 1) > 128)
466 delay = 128;
467 if (retries++ > VNET_MAX_RETRIES) {
468 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
469 port->raddr[0], port->raddr[1],
470 port->raddr[2], port->raddr[3],
471 port->raddr[4], port->raddr[5]);
472 break;
473 }
474 } while (err == -EAGAIN);
475
476 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
477 port->stop_rx_idx = end;
478 port->stop_rx = true;
479 } else {
480 port->stop_rx_idx = 0;
481 port->stop_rx = false;
482 }
483
484 return err;
485}
486
487static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
488 struct vio_dring_state *dr,
489 u32 index)
490{
491 struct vio_net_desc *desc = port->vio.desc_buf;
492 int err;
493
494 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
495 (index * dr->entry_size),
496 dr->cookies, dr->ncookies);
497 if (err < 0)
498 return ERR_PTR(err);
499
500 return desc;
501}
502
503static int put_rx_desc(struct vnet_port *port,
504 struct vio_dring_state *dr,
505 struct vio_net_desc *desc,
506 u32 index)
507{
508 int err;
509
510 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
511 (index * dr->entry_size),
512 dr->cookies, dr->ncookies);
513 if (err < 0)
514 return err;
515
516 return 0;
517}
518
519static int vnet_walk_rx_one(struct vnet_port *port,
520 struct vio_dring_state *dr,
521 u32 index, int *needs_ack)
522{
523 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
524 struct vio_driver_state *vio = &port->vio;
525 int err;
526
527 BUG_ON(desc == NULL);
528 if (IS_ERR(desc))
529 return PTR_ERR(desc);
530
531 if (desc->hdr.state != VIO_DESC_READY)
532 return 1;
533
534 dma_rmb();
535
536 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
537 desc->hdr.state, desc->hdr.ack,
538 desc->size, desc->ncookies,
539 desc->cookies[0].cookie_addr,
540 desc->cookies[0].cookie_size);
541
542 err = vnet_rx_one(port, desc);
543 if (err == -ECONNRESET)
544 return err;
545 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
546 index, desc->hdr.ack);
547 desc->hdr.state = VIO_DESC_DONE;
548 err = put_rx_desc(port, dr, desc, index);
549 if (err < 0)
550 return err;
551 *needs_ack = desc->hdr.ack;
552 return 0;
553}
554
555static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
556 u32 start, u32 end, int *npkts, int budget)
557{
558 struct vio_driver_state *vio = &port->vio;
559 int ack_start = -1, ack_end = -1;
560 bool send_ack = true;
561
562 end = (end == (u32) -1) ? vio_dring_prev(dr, start)
563 : vio_dring_next(dr, end);
564
565 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
566
567 while (start != end) {
568 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
569 if (err == -ECONNRESET)
570 return err;
571 if (err != 0)
572 break;
573 (*npkts)++;
574 if (ack_start == -1)
575 ack_start = start;
576 ack_end = start;
577 start = vio_dring_next(dr, start);
578 if (ack && start != end) {
579 err = vnet_send_ack(port, dr, ack_start, ack_end,
580 VIO_DRING_ACTIVE);
581 if (err == -ECONNRESET)
582 return err;
583 ack_start = -1;
584 }
585 if ((*npkts) >= budget) {
586 send_ack = false;
587 break;
588 }
589 }
590 if (unlikely(ack_start == -1))
591 ack_start = ack_end = vio_dring_prev(dr, start);
592 if (send_ack) {
593 port->napi_resume = false;
594 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
595 port->vio._peer_sid,
596 ack_end, *npkts);
597 return vnet_send_ack(port, dr, ack_start, ack_end,
598 VIO_DRING_STOPPED);
599 } else {
600 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
601 port->vio._peer_sid,
602 ack_end, *npkts);
603 port->napi_resume = true;
604 port->napi_stop_idx = ack_end;
605 return 1;
606 }
607}
608
609static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
610 int budget)
611{
612 struct vio_dring_data *pkt = msgbuf;
613 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
614 struct vio_driver_state *vio = &port->vio;
615
616 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
617 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
618
619 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
620 return 0;
621 if (unlikely(pkt->seq != dr->rcv_nxt)) {
622 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
623 pkt->seq, dr->rcv_nxt);
624 return 0;
625 }
626
627 if (!port->napi_resume)
628 dr->rcv_nxt++;
629
630 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
631
632 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
633 npkts, budget);
634}
635
636static int idx_is_pending(struct vio_dring_state *dr, u32 end)
637{
638 u32 idx = dr->cons;
639 int found = 0;
640
641 while (idx != dr->prod) {
642 if (idx == end) {
643 found = 1;
644 break;
645 }
646 idx = vio_dring_next(dr, idx);
647 }
648 return found;
649}
650
651static int vnet_ack(struct vnet_port *port, void *msgbuf)
652{
653 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
654 struct vio_dring_data *pkt = msgbuf;
655 struct net_device *dev;
656 struct vnet *vp;
657 u32 end;
658 struct vio_net_desc *desc;
659 struct netdev_queue *txq;
660
661 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
662 return 0;
663
664 end = pkt->end_idx;
665 vp = port->vp;
666 dev = vp->dev;
667 netif_tx_lock(dev);
668 if (unlikely(!idx_is_pending(dr, end))) {
669 netif_tx_unlock(dev);
670 return 0;
671 }
672
673 /* sync for race conditions with vnet_start_xmit() and tell xmit it
674 * is time to send a trigger.
675 */
676 trace_vnet_rx_stopped_ack(port->vio._local_sid,
677 port->vio._peer_sid, end);
678 dr->cons = vio_dring_next(dr, end);
679 desc = vio_dring_entry(dr, dr->cons);
680 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
681 /* vnet_start_xmit() just populated this dring but missed
682 * sending the "start" LDC message to the consumer.
683 * Send a "start" trigger on its behalf.
684 */
685 if (__vnet_tx_trigger(port, dr->cons) > 0)
686 port->start_cons = false;
687 else
688 port->start_cons = true;
689 } else {
690 port->start_cons = true;
691 }
692 netif_tx_unlock(dev);
693
694 txq = netdev_get_tx_queue(dev, port->q_index);
695 if (unlikely(netif_tx_queue_stopped(txq) &&
696 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
697 return 1;
698
699 return 0;
700}
701
702static int vnet_nack(struct vnet_port *port, void *msgbuf)
703{
704 /* XXX just reset or similar XXX */
705 return 0;
706}
707
708static int handle_mcast(struct vnet_port *port, void *msgbuf)
709{
710 struct vio_net_mcast_info *pkt = msgbuf;
711
712 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
713 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
714 port->vp->dev->name,
715 pkt->tag.type,
716 pkt->tag.stype,
717 pkt->tag.stype_env,
718 pkt->tag.sid);
719
720 return 0;
721}
722
723/* Got back a STOPPED LDC message on port. If the queue is stopped,
724 * wake it up so that we'll send out another START message at the
725 * next TX.
726 */
727static void maybe_tx_wakeup(struct vnet_port *port)
728{
729 struct netdev_queue *txq;
730
731 txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
732 __netif_tx_lock(txq, smp_processor_id());
733 if (likely(netif_tx_queue_stopped(txq))) {
734 struct vio_dring_state *dr;
735
736 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
737 netif_tx_wake_queue(txq);
738 }
739 __netif_tx_unlock(txq);
740}
741
742static inline bool port_is_up(struct vnet_port *vnet)
743{
744 struct vio_driver_state *vio = &vnet->vio;
745
746 return !!(vio->hs_state & VIO_HS_COMPLETE);
747}
748
749static int vnet_event_napi(struct vnet_port *port, int budget)
750{
751 struct vio_driver_state *vio = &port->vio;
752 int tx_wakeup, err;
753 int npkts = 0;
754 int event = (port->rx_event & LDC_EVENT_RESET);
755
756ldc_ctrl:
757 if (unlikely(event == LDC_EVENT_RESET ||
758 event == LDC_EVENT_UP)) {
759 vio_link_state_change(vio, event);
760
761 if (event == LDC_EVENT_RESET) {
762 vnet_port_reset(port);
763 vio_port_up(vio);
764 }
765 port->rx_event = 0;
766 return 0;
767 }
768 /* We may have multiple LDC events in rx_event. Unroll send_events() */
769 event = (port->rx_event & LDC_EVENT_UP);
770 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
771 if (event == LDC_EVENT_UP)
772 goto ldc_ctrl;
773 event = port->rx_event;
774 if (!(event & LDC_EVENT_DATA_READY))
775 return 0;
776
777 /* we dont expect any other bits than RESET, UP, DATA_READY */
778 BUG_ON(event != LDC_EVENT_DATA_READY);
779
780 tx_wakeup = err = 0;
781 while (1) {
782 union {
783 struct vio_msg_tag tag;
784 u64 raw[8];
785 } msgbuf;
786
787 if (port->napi_resume) {
788 struct vio_dring_data *pkt =
789 (struct vio_dring_data *)&msgbuf;
790 struct vio_dring_state *dr =
791 &port->vio.drings[VIO_DRIVER_RX_RING];
792
793 pkt->tag.type = VIO_TYPE_DATA;
794 pkt->tag.stype = VIO_SUBTYPE_INFO;
795 pkt->tag.stype_env = VIO_DRING_DATA;
796 pkt->seq = dr->rcv_nxt;
797 pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
798 pkt->end_idx = -1;
799 goto napi_resume;
800 }
801 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
802 if (unlikely(err < 0)) {
803 if (err == -ECONNRESET)
804 vio_conn_reset(vio);
805 break;
806 }
807 if (err == 0)
808 break;
809 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
810 msgbuf.tag.type,
811 msgbuf.tag.stype,
812 msgbuf.tag.stype_env,
813 msgbuf.tag.sid);
814 err = vio_validate_sid(vio, &msgbuf.tag);
815 if (err < 0)
816 break;
817napi_resume:
818 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
819 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
820 if (!port_is_up(port)) {
821 /* failures like handshake_failure()
822 * may have cleaned up dring, but
823 * NAPI polling may bring us here.
824 */
825 err = -ECONNRESET;
826 break;
827 }
828 err = vnet_rx(port, &msgbuf, &npkts, budget);
829 if (npkts >= budget)
830 break;
831 if (npkts == 0)
832 break;
833 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
834 err = vnet_ack(port, &msgbuf);
835 if (err > 0)
836 tx_wakeup |= err;
837 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
838 err = vnet_nack(port, &msgbuf);
839 }
840 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
841 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
842 err = handle_mcast(port, &msgbuf);
843 else
844 err = vio_control_pkt_engine(vio, &msgbuf);
845 if (err)
846 break;
847 } else {
848 err = vnet_handle_unknown(port, &msgbuf);
849 }
850 if (err == -ECONNRESET)
851 break;
852 }
853 if (unlikely(tx_wakeup && err != -ECONNRESET))
854 maybe_tx_wakeup(port);
855 return npkts;
856}
857
858static int vnet_poll(struct napi_struct *napi, int budget)
859{
860 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
861 struct vio_driver_state *vio = &port->vio;
862 int processed = vnet_event_napi(port, budget);
863
864 if (processed < budget) {
865 napi_complete(napi);
866 port->rx_event &= ~LDC_EVENT_DATA_READY;
867 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
868 }
869 return processed;
870}
871
872static void vnet_event(void *arg, int event)
873{
874 struct vnet_port *port = arg;
875 struct vio_driver_state *vio = &port->vio;
876
877 port->rx_event |= event;
878 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
879 napi_schedule(&port->napi);
880
881}
882
883static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
884{
885 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
886 struct vio_dring_data hdr = {
887 .tag = {
888 .type = VIO_TYPE_DATA,
889 .stype = VIO_SUBTYPE_INFO,
890 .stype_env = VIO_DRING_DATA,
891 .sid = vio_send_sid(&port->vio),
892 },
893 .dring_ident = dr->ident,
894 .start_idx = start,
895 .end_idx = (u32) -1,
896 };
897 int err, delay;
898 int retries = 0;
899
900 if (port->stop_rx) {
901 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
902 port->vio._peer_sid,
903 port->stop_rx_idx, -1);
904 err = vnet_send_ack(port,
905 &port->vio.drings[VIO_DRIVER_RX_RING],
906 port->stop_rx_idx, -1,
907 VIO_DRING_STOPPED);
908 if (err <= 0)
909 return err;
910 }
911
912 hdr.seq = dr->snd_nxt;
913 delay = 1;
914 do {
915 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
916 if (err > 0) {
917 dr->snd_nxt++;
918 break;
919 }
920 udelay(delay);
921 if ((delay <<= 1) > 128)
922 delay = 128;
923 if (retries++ > VNET_MAX_RETRIES)
924 break;
925 } while (err == -EAGAIN);
926 trace_vnet_tx_trigger(port->vio._local_sid,
927 port->vio._peer_sid, start, err);
928
929 return err;
930}
931
932struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
933{
934 unsigned int hash = vnet_hashfn(skb->data);
935 struct hlist_head *hp = &vp->port_hash[hash];
936 struct vnet_port *port;
937
938 hlist_for_each_entry_rcu(port, hp, hash) {
939 if (!port_is_up(port))
940 continue;
941 if (ether_addr_equal(port->raddr, skb->data))
942 return port;
943 }
944 list_for_each_entry_rcu(port, &vp->port_list, list) {
945 if (!port->switch_port)
946 continue;
947 if (!port_is_up(port))
948 continue;
949 return port;
950 }
951 return NULL;
952}
953
954static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
955 unsigned *pending)
956{
957 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
958 struct sk_buff *skb = NULL;
959 int i, txi;
960
961 *pending = 0;
962
963 txi = dr->prod;
964 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
965 struct vio_net_desc *d;
966
967 --txi;
968 if (txi < 0)
969 txi = VNET_TX_RING_SIZE-1;
970
971 d = vio_dring_entry(dr, txi);
972
973 if (d->hdr.state == VIO_DESC_READY) {
974 (*pending)++;
975 continue;
976 }
977 if (port->tx_bufs[txi].skb) {
978 if (d->hdr.state != VIO_DESC_DONE)
979 pr_notice("invalid ring buffer state %d\n",
980 d->hdr.state);
981 BUG_ON(port->tx_bufs[txi].skb->next);
982
983 port->tx_bufs[txi].skb->next = skb;
984 skb = port->tx_bufs[txi].skb;
985 port->tx_bufs[txi].skb = NULL;
986
987 ldc_unmap(port->vio.lp,
988 port->tx_bufs[txi].cookies,
989 port->tx_bufs[txi].ncookies);
990 } else if (d->hdr.state == VIO_DESC_FREE)
991 break;
992 d->hdr.state = VIO_DESC_FREE;
993 }
994 return skb;
995}
996
997static inline void vnet_free_skbs(struct sk_buff *skb)
998{
999 struct sk_buff *next;
1000
1001 while (skb) {
1002 next = skb->next;
1003 skb->next = NULL;
1004 dev_kfree_skb(skb);
1005 skb = next;
1006 }
1007}
1008
1009static void vnet_clean_timer_expire(unsigned long port0)
1010{
1011 struct vnet_port *port = (struct vnet_port *)port0;
1012 struct sk_buff *freeskbs;
1013 unsigned pending;
1014
1015 netif_tx_lock(port->vp->dev);
1016 freeskbs = vnet_clean_tx_ring(port, &pending);
1017 netif_tx_unlock(port->vp->dev);
1018
1019 vnet_free_skbs(freeskbs);
1020
1021 if (pending)
1022 (void)mod_timer(&port->clean_timer,
1023 jiffies + VNET_CLEAN_TIMEOUT);
1024 else
1025 del_timer(&port->clean_timer);
1026}
1027
1028static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1029 struct ldc_trans_cookie *cookies, int ncookies,
1030 unsigned int map_perm)
1031{
1032 int i, nc, err, blen;
1033
1034 /* header */
1035 blen = skb_headlen(skb);
1036 if (blen < ETH_ZLEN)
1037 blen = ETH_ZLEN;
1038 blen += VNET_PACKET_SKIP;
1039 blen += 8 - (blen & 7);
1040
1041 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1042 ncookies, map_perm);
1043 if (err < 0)
1044 return err;
1045 nc = err;
1046
1047 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1048 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1049 u8 *vaddr;
1050
1051 if (nc < ncookies) {
1052 vaddr = kmap_atomic(skb_frag_page(f));
1053 blen = skb_frag_size(f);
1054 blen += 8 - (blen & 7);
1055 err = ldc_map_single(lp, vaddr + f->page_offset,
1056 blen, cookies + nc, ncookies - nc,
1057 map_perm);
1058 kunmap_atomic(vaddr);
1059 } else {
1060 err = -EMSGSIZE;
1061 }
1062
1063 if (err < 0) {
1064 ldc_unmap(lp, cookies, nc);
1065 return err;
1066 }
1067 nc += err;
1068 }
1069 return nc;
1070}
1071
1072static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1073{
1074 struct sk_buff *nskb;
1075 int i, len, pad, docopy;
1076
1077 len = skb->len;
1078 pad = 0;
1079 if (len < ETH_ZLEN) {
1080 pad += ETH_ZLEN - skb->len;
1081 len += pad;
1082 }
1083 len += VNET_PACKET_SKIP;
1084 pad += 8 - (len & 7);
1085
1086 /* make sure we have enough cookies and alignment in every frag */
1087 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1088 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1089 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1090
1091 docopy |= f->page_offset & 7;
1092 }
1093 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1094 skb_tailroom(skb) < pad ||
1095 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1096 int start = 0, offset;
1097 __wsum csum;
1098
1099 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1100 nskb = alloc_and_align_skb(skb->dev, len);
1101 if (nskb == NULL) {
1102 dev_kfree_skb(skb);
1103 return NULL;
1104 }
1105 skb_reserve(nskb, VNET_PACKET_SKIP);
1106
1107 nskb->protocol = skb->protocol;
1108 offset = skb_mac_header(skb) - skb->data;
1109 skb_set_mac_header(nskb, offset);
1110 offset = skb_network_header(skb) - skb->data;
1111 skb_set_network_header(nskb, offset);
1112 offset = skb_transport_header(skb) - skb->data;
1113 skb_set_transport_header(nskb, offset);
1114
1115 offset = 0;
1116 nskb->csum_offset = skb->csum_offset;
1117 nskb->ip_summed = skb->ip_summed;
1118
1119 if (skb->ip_summed == CHECKSUM_PARTIAL)
1120 start = skb_checksum_start_offset(skb);
1121 if (start) {
1122 struct iphdr *iph = ip_hdr(nskb);
1123 int offset = start + nskb->csum_offset;
1124
1125 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1126 dev_kfree_skb(nskb);
1127 dev_kfree_skb(skb);
1128 return NULL;
1129 }
1130 *(__sum16 *)(skb->data + offset) = 0;
1131 csum = skb_copy_and_csum_bits(skb, start,
1132 nskb->data + start,
1133 skb->len - start, 0);
1134 if (iph->protocol == IPPROTO_TCP ||
1135 iph->protocol == IPPROTO_UDP) {
1136 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1137 skb->len - start,
1138 iph->protocol, csum);
1139 }
1140 *(__sum16 *)(nskb->data + offset) = csum;
1141
1142 nskb->ip_summed = CHECKSUM_NONE;
1143 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1144 dev_kfree_skb(nskb);
1145 dev_kfree_skb(skb);
1146 return NULL;
1147 }
1148 (void)skb_put(nskb, skb->len);
1149 if (skb_is_gso(skb)) {
1150 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1151 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1152 }
1153 nskb->queue_mapping = skb->queue_mapping;
1154 dev_kfree_skb(skb);
1155 skb = nskb;
1156 }
1157 return skb;
1158}
1159
1160static u16
1161vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
1162 void *accel_priv, select_queue_fallback_t fallback)
1163{
1164 struct vnet *vp = netdev_priv(dev);
1165 struct vnet_port *port = __tx_port_find(vp, skb);
1166
1167 if (port == NULL)
1168 return 0;
1169 return port->q_index;
1170}
1171
1172static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
1173
1174static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1175{
1176 struct net_device *dev = port->vp->dev;
1177 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1178 struct sk_buff *segs;
1179 int maclen, datalen;
1180 int status;
1181 int gso_size, gso_type, gso_segs;
1182 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1183 int proto = IPPROTO_IP;
1184
1185 if (skb->protocol == htons(ETH_P_IP))
1186 proto = ip_hdr(skb)->protocol;
1187 else if (skb->protocol == htons(ETH_P_IPV6))
1188 proto = ipv6_hdr(skb)->nexthdr;
1189
1190 if (proto == IPPROTO_TCP)
1191 hlen += tcp_hdr(skb)->doff * 4;
1192 else if (proto == IPPROTO_UDP)
1193 hlen += sizeof(struct udphdr);
1194 else {
1195 pr_err("vnet_handle_offloads GSO with unknown transport "
1196 "protocol %d tproto %d\n", skb->protocol, proto);
1197 hlen = 128; /* XXX */
1198 }
1199 datalen = port->tsolen - hlen;
1200
1201 gso_size = skb_shinfo(skb)->gso_size;
1202 gso_type = skb_shinfo(skb)->gso_type;
1203 gso_segs = skb_shinfo(skb)->gso_segs;
1204
1205 if (port->tso && gso_size < datalen)
1206 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1207
1208 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1209 struct netdev_queue *txq;
1210
1211 txq = netdev_get_tx_queue(dev, port->q_index);
1212 netif_tx_stop_queue(txq);
1213 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1214 return NETDEV_TX_BUSY;
1215 netif_tx_wake_queue(txq);
1216 }
1217
1218 maclen = skb_network_header(skb) - skb_mac_header(skb);
1219 skb_pull(skb, maclen);
1220
1221 if (port->tso && gso_size < datalen) {
1222 if (skb_unclone(skb, GFP_ATOMIC))
1223 goto out_dropped;
1224
1225 /* segment to TSO size */
1226 skb_shinfo(skb)->gso_size = datalen;
1227 skb_shinfo(skb)->gso_segs = gso_segs;
1228 }
1229 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1230 if (IS_ERR(segs))
1231 goto out_dropped;
1232
1233 skb_push(skb, maclen);
1234 skb_reset_mac_header(skb);
1235
1236 status = 0;
1237 while (segs) {
1238 struct sk_buff *curr = segs;
1239
1240 segs = segs->next;
1241 curr->next = NULL;
1242 if (port->tso && curr->len > dev->mtu) {
1243 skb_shinfo(curr)->gso_size = gso_size;
1244 skb_shinfo(curr)->gso_type = gso_type;
1245 skb_shinfo(curr)->gso_segs =
1246 DIV_ROUND_UP(curr->len - hlen, gso_size);
1247 } else
1248 skb_shinfo(curr)->gso_size = 0;
1249
1250 skb_push(curr, maclen);
1251 skb_reset_mac_header(curr);
1252 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1253 maclen);
1254 curr->csum_start = skb_transport_header(curr) - curr->head;
1255 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1256 curr->csum_offset = offsetof(struct tcphdr, check);
1257 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1258 curr->csum_offset = offsetof(struct udphdr, check);
1259
1260 if (!(status & NETDEV_TX_MASK))
1261 status = vnet_start_xmit(curr, dev);
1262 if (status & NETDEV_TX_MASK)
1263 dev_kfree_skb_any(curr);
1264 }
1265
1266 if (!(status & NETDEV_TX_MASK))
1267 dev_kfree_skb_any(skb);
1268 return status;
1269out_dropped:
1270 dev->stats.tx_dropped++;
1271 dev_kfree_skb_any(skb);
1272 return NETDEV_TX_OK;
1273}
1274
1275static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
1276{
1277 struct vnet *vp = netdev_priv(dev);
1278 struct vnet_port *port = NULL;
1279 struct vio_dring_state *dr;
1280 struct vio_net_desc *d;
1281 unsigned int len;
1282 struct sk_buff *freeskbs = NULL;
1283 int i, err, txi;
1284 unsigned pending = 0;
1285 struct netdev_queue *txq;
1286
1287 rcu_read_lock();
1288 port = __tx_port_find(vp, skb);
1289 if (unlikely(!port)) {
1290 rcu_read_unlock();
1291 goto out_dropped;
1292 }
1293
1294 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1295 err = vnet_handle_offloads(port, skb);
1296 rcu_read_unlock();
1297 return err;
1298 }
1299
1300 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1301 unsigned long localmtu = port->rmtu - ETH_HLEN;
1302
1303 if (vio_version_after_eq(&port->vio, 1, 3))
1304 localmtu -= VLAN_HLEN;
1305
1306 if (skb->protocol == htons(ETH_P_IP)) {
1307 struct flowi4 fl4;
1308 struct rtable *rt = NULL;
1309
1310 memset(&fl4, 0, sizeof(fl4));
1311 fl4.flowi4_oif = dev->ifindex;
1312 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1313 fl4.daddr = ip_hdr(skb)->daddr;
1314 fl4.saddr = ip_hdr(skb)->saddr;
1315
1316 rt = ip_route_output_key(dev_net(dev), &fl4);
1317 rcu_read_unlock();
1318 if (!IS_ERR(rt)) {
1319 skb_dst_set(skb, &rt->dst);
1320 icmp_send(skb, ICMP_DEST_UNREACH,
1321 ICMP_FRAG_NEEDED,
1322 htonl(localmtu));
1323 }
1324 }
1325#if IS_ENABLED(CONFIG_IPV6)
1326 else if (skb->protocol == htons(ETH_P_IPV6))
1327 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1328#endif
1329 goto out_dropped;
1330 }
1331
1332 skb = vnet_skb_shape(skb, 2);
1333
1334 if (unlikely(!skb))
1335 goto out_dropped;
1336
1337 if (skb->ip_summed == CHECKSUM_PARTIAL)
1338 vnet_fullcsum(skb);
1339
1340 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1341 i = skb_get_queue_mapping(skb);
1342 txq = netdev_get_tx_queue(dev, i);
1343 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1344 if (!netif_tx_queue_stopped(txq)) {
1345 netif_tx_stop_queue(txq);
1346
1347 /* This is a hard error, log it. */
1348 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1349 dev->stats.tx_errors++;
1350 }
1351 rcu_read_unlock();
1352 return NETDEV_TX_BUSY;
1353 }
1354
1355 d = vio_dring_cur(dr);
1356
1357 txi = dr->prod;
1358
1359 freeskbs = vnet_clean_tx_ring(port, &pending);
1360
1361 BUG_ON(port->tx_bufs[txi].skb);
1362
1363 len = skb->len;
1364 if (len < ETH_ZLEN)
1365 len = ETH_ZLEN;
1366
1367 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1368 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1369 if (err < 0) {
1370 netdev_info(dev, "tx buffer map error %d\n", err);
1371 goto out_dropped;
1372 }
1373
1374 port->tx_bufs[txi].skb = skb;
1375 skb = NULL;
1376 port->tx_bufs[txi].ncookies = err;
1377
1378 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1379 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1380 * the protocol itself does not require it as long as the peer
1381 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1382 *
1383 * An ACK for every packet in the ring is expensive as the
1384 * sending of LDC messages is slow and affects performance.
1385 */
1386 d->hdr.ack = VIO_ACK_DISABLE;
1387 d->size = len;
1388 d->ncookies = port->tx_bufs[txi].ncookies;
1389 for (i = 0; i < d->ncookies; i++)
1390 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1391 if (vio_version_after_eq(&port->vio, 1, 7)) {
1392 struct vio_net_dext *dext = vio_net_ext(d);
1393
1394 memset(dext, 0, sizeof(*dext));
1395 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1396 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1397 ->gso_size;
1398 dext->flags |= VNET_PKT_IPV4_LSO;
1399 }
1400 if (vio_version_after_eq(&port->vio, 1, 8) &&
1401 !port->switch_port) {
1402 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1403 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1404 }
1405 }
1406
1407 /* This has to be a non-SMP write barrier because we are writing
1408 * to memory which is shared with the peer LDOM.
1409 */
1410 dma_wmb();
1411
1412 d->hdr.state = VIO_DESC_READY;
1413
1414 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1415 * to notify the consumer that some descriptors are READY.
1416 * After that "start" trigger, no additional triggers are needed until
1417 * a DRING_STOPPED is received from the consumer. The dr->cons field
1418 * (set up by vnet_ack()) has the value of the next dring index
1419 * that has not yet been ack-ed. We send a "start" trigger here
1420 * if, and only if, start_cons is true (reset it afterward). Conversely,
1421 * vnet_ack() should check if the dring corresponding to cons
1422 * is marked READY, but start_cons was false.
1423 * If so, vnet_ack() should send out the missed "start" trigger.
1424 *
1425 * Note that the dma_wmb() above makes sure the cookies et al. are
1426 * not globally visible before the VIO_DESC_READY, and that the
1427 * stores are ordered correctly by the compiler. The consumer will
1428 * not proceed until the VIO_DESC_READY is visible assuring that
1429 * the consumer does not observe anything related to descriptors
1430 * out of order. The HV trap from the LDC start trigger is the
1431 * producer to consumer announcement that work is available to the
1432 * consumer
1433 */
1434 if (!port->start_cons) { /* previous trigger suffices */
1435 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1436 port->vio._peer_sid, dr->cons);
1437 goto ldc_start_done;
1438 }
1439
1440 err = __vnet_tx_trigger(port, dr->cons);
1441 if (unlikely(err < 0)) {
1442 netdev_info(dev, "TX trigger error %d\n", err);
1443 d->hdr.state = VIO_DESC_FREE;
1444 skb = port->tx_bufs[txi].skb;
1445 port->tx_bufs[txi].skb = NULL;
1446 dev->stats.tx_carrier_errors++;
1447 goto out_dropped;
1448 }
1449
1450ldc_start_done:
1451 port->start_cons = false;
1452
1453 dev->stats.tx_packets++;
1454 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1455
1456 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1457 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1458 netif_tx_stop_queue(txq);
1459 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1460 netif_tx_wake_queue(txq);
1461 }
1462
1463 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1464 rcu_read_unlock();
1465
1466 vnet_free_skbs(freeskbs);
1467
1468 return NETDEV_TX_OK;
1469
1470out_dropped:
1471 if (pending)
1472 (void)mod_timer(&port->clean_timer,
1473 jiffies + VNET_CLEAN_TIMEOUT);
1474 else if (port)
1475 del_timer(&port->clean_timer);
1476 if (port)
1477 rcu_read_unlock();
1478 if (skb)
1479 dev_kfree_skb(skb);
1480 vnet_free_skbs(freeskbs);
1481 dev->stats.tx_dropped++;
1482 return NETDEV_TX_OK;
1483}
1484
1485static void vnet_tx_timeout(struct net_device *dev)
1486{
1487 /* XXX Implement me XXX */
1488}
1489
1490static int vnet_open(struct net_device *dev)
1491{
1492 netif_carrier_on(dev);
1493 netif_tx_start_all_queues(dev);
1494
1495 return 0;
1496}
1497
1498static int vnet_close(struct net_device *dev)
1499{
1500 netif_tx_stop_all_queues(dev);
1501 netif_carrier_off(dev);
1502
1503 return 0;
1504}
1505
1506static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1507{
1508 struct vnet_mcast_entry *m;
1509
1510 for (m = vp->mcast_list; m; m = m->next) {
1511 if (ether_addr_equal(m->addr, addr))
1512 return m;
1513 }
1514 return NULL;
1515}
1516
1517static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1518{
1519 struct netdev_hw_addr *ha;
1520
1521 netdev_for_each_mc_addr(ha, dev) {
1522 struct vnet_mcast_entry *m;
1523
1524 m = __vnet_mc_find(vp, ha->addr);
1525 if (m) {
1526 m->hit = 1;
1527 continue;
1528 }
1529
1530 if (!m) {
1531 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1532 if (!m)
1533 continue;
1534 memcpy(m->addr, ha->addr, ETH_ALEN);
1535 m->hit = 1;
1536
1537 m->next = vp->mcast_list;
1538 vp->mcast_list = m;
1539 }
1540 }
1541}
1542
1543static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1544{
1545 struct vio_net_mcast_info info;
1546 struct vnet_mcast_entry *m, **pp;
1547 int n_addrs;
1548
1549 memset(&info, 0, sizeof(info));
1550
1551 info.tag.type = VIO_TYPE_CTRL;
1552 info.tag.stype = VIO_SUBTYPE_INFO;
1553 info.tag.stype_env = VNET_MCAST_INFO;
1554 info.tag.sid = vio_send_sid(&port->vio);
1555 info.set = 1;
1556
1557 n_addrs = 0;
1558 for (m = vp->mcast_list; m; m = m->next) {
1559 if (m->sent)
1560 continue;
1561 m->sent = 1;
1562 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1563 m->addr, ETH_ALEN);
1564 if (++n_addrs == VNET_NUM_MCAST) {
1565 info.count = n_addrs;
1566
1567 (void) vio_ldc_send(&port->vio, &info,
1568 sizeof(info));
1569 n_addrs = 0;
1570 }
1571 }
1572 if (n_addrs) {
1573 info.count = n_addrs;
1574 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1575 }
1576
1577 info.set = 0;
1578
1579 n_addrs = 0;
1580 pp = &vp->mcast_list;
1581 while ((m = *pp) != NULL) {
1582 if (m->hit) {
1583 m->hit = 0;
1584 pp = &m->next;
1585 continue;
1586 }
1587
1588 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1589 m->addr, ETH_ALEN);
1590 if (++n_addrs == VNET_NUM_MCAST) {
1591 info.count = n_addrs;
1592 (void) vio_ldc_send(&port->vio, &info,
1593 sizeof(info));
1594 n_addrs = 0;
1595 }
1596
1597 *pp = m->next;
1598 kfree(m);
1599 }
1600 if (n_addrs) {
1601 info.count = n_addrs;
1602 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1603 }
1604}
1605
1606static void vnet_set_rx_mode(struct net_device *dev)
1607{
1608 struct vnet *vp = netdev_priv(dev);
1609 struct vnet_port *port;
1610
1611 rcu_read_lock();
1612 list_for_each_entry_rcu(port, &vp->port_list, list) {
1613
1614 if (port->switch_port) {
1615 __update_mc_list(vp, dev);
1616 __send_mc_list(vp, port);
1617 break;
1618 }
1619 }
1620 rcu_read_unlock();
1621}
1622
1623static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1624{
1625 if (new_mtu < 68 || new_mtu > 65535)
1626 return -EINVAL;
1627
1628 dev->mtu = new_mtu;
1629 return 0;
1630}
1631
1632static int vnet_set_mac_addr(struct net_device *dev, void *p)
1633{
1634 return -EINVAL;
1635}
1636
1637static void vnet_get_drvinfo(struct net_device *dev, 58static void vnet_get_drvinfo(struct net_device *dev,
1638 struct ethtool_drvinfo *info) 59 struct ethtool_drvinfo *info)
1639{ 60{
@@ -1660,129 +81,21 @@ static const struct ethtool_ops vnet_ethtool_ops = {
1660 .get_link = ethtool_op_get_link, 81 .get_link = ethtool_op_get_link,
1661}; 82};
1662 83
1663static void vnet_port_free_tx_bufs(struct vnet_port *port)
1664{
1665 struct vio_dring_state *dr;
1666 int i;
1667
1668 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1669
1670 if (dr->base == NULL)
1671 return;
1672
1673 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1674 struct vio_net_desc *d;
1675 void *skb = port->tx_bufs[i].skb;
1676
1677 if (!skb)
1678 continue;
1679
1680 d = vio_dring_entry(dr, i);
1681
1682 ldc_unmap(port->vio.lp,
1683 port->tx_bufs[i].cookies,
1684 port->tx_bufs[i].ncookies);
1685 dev_kfree_skb(skb);
1686 port->tx_bufs[i].skb = NULL;
1687 d->hdr.state = VIO_DESC_FREE;
1688 }
1689 ldc_free_exp_dring(port->vio.lp, dr->base,
1690 (dr->entry_size * dr->num_entries),
1691 dr->cookies, dr->ncookies);
1692 dr->base = NULL;
1693 dr->entry_size = 0;
1694 dr->num_entries = 0;
1695 dr->pending = 0;
1696 dr->ncookies = 0;
1697}
1698
1699static void vnet_port_reset(struct vnet_port *port)
1700{
1701 del_timer(&port->clean_timer);
1702 vnet_port_free_tx_bufs(port);
1703 port->rmtu = 0;
1704 port->tso = true;
1705 port->tsolen = 0;
1706}
1707
1708static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1709{
1710 struct vio_dring_state *dr;
1711 unsigned long len, elen;
1712 int i, err, ncookies;
1713 void *dring;
1714
1715 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1716
1717 elen = sizeof(struct vio_net_desc) +
1718 sizeof(struct ldc_trans_cookie) * 2;
1719 if (vio_version_after_eq(&port->vio, 1, 7))
1720 elen += sizeof(struct vio_net_dext);
1721 len = VNET_TX_RING_SIZE * elen;
1722
1723 ncookies = VIO_MAX_RING_COOKIES;
1724 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1725 dr->cookies, &ncookies,
1726 (LDC_MAP_SHADOW |
1727 LDC_MAP_DIRECT |
1728 LDC_MAP_RW));
1729 if (IS_ERR(dring)) {
1730 err = PTR_ERR(dring);
1731 goto err_out;
1732 }
1733
1734 dr->base = dring;
1735 dr->entry_size = elen;
1736 dr->num_entries = VNET_TX_RING_SIZE;
1737 dr->prod = dr->cons = 0;
1738 port->start_cons = true; /* need an initial trigger */
1739 dr->pending = VNET_TX_RING_SIZE;
1740 dr->ncookies = ncookies;
1741
1742 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1743 struct vio_net_desc *d;
1744
1745 d = vio_dring_entry(dr, i);
1746 d->hdr.state = VIO_DESC_FREE;
1747 }
1748 return 0;
1749
1750err_out:
1751 vnet_port_free_tx_bufs(port);
1752
1753 return err;
1754}
1755
1756#ifdef CONFIG_NET_POLL_CONTROLLER
1757static void vnet_poll_controller(struct net_device *dev)
1758{
1759 struct vnet *vp = netdev_priv(dev);
1760 struct vnet_port *port;
1761 unsigned long flags;
1762
1763 spin_lock_irqsave(&vp->lock, flags);
1764 if (!list_empty(&vp->port_list)) {
1765 port = list_entry(vp->port_list.next, struct vnet_port, list);
1766 napi_schedule(&port->napi);
1767 }
1768 spin_unlock_irqrestore(&vp->lock, flags);
1769}
1770#endif
1771static LIST_HEAD(vnet_list); 84static LIST_HEAD(vnet_list);
1772static DEFINE_MUTEX(vnet_list_mutex); 85static DEFINE_MUTEX(vnet_list_mutex);
1773 86
1774static const struct net_device_ops vnet_ops = { 87static const struct net_device_ops vnet_ops = {
1775 .ndo_open = vnet_open, 88 .ndo_open = sunvnet_open_common,
1776 .ndo_stop = vnet_close, 89 .ndo_stop = sunvnet_close_common,
1777 .ndo_set_rx_mode = vnet_set_rx_mode, 90 .ndo_set_rx_mode = sunvnet_set_rx_mode_common,
1778 .ndo_set_mac_address = vnet_set_mac_addr, 91 .ndo_set_mac_address = sunvnet_set_mac_addr_common,
1779 .ndo_validate_addr = eth_validate_addr, 92 .ndo_validate_addr = eth_validate_addr,
1780 .ndo_tx_timeout = vnet_tx_timeout, 93 .ndo_tx_timeout = sunvnet_tx_timeout_common,
1781 .ndo_change_mtu = vnet_change_mtu, 94 .ndo_change_mtu = sunvnet_change_mtu_common,
1782 .ndo_start_xmit = vnet_start_xmit, 95 .ndo_start_xmit = sunvnet_start_xmit_common,
1783 .ndo_select_queue = vnet_select_queue, 96 .ndo_select_queue = sunvnet_select_queue_common,
1784#ifdef CONFIG_NET_POLL_CONTROLLER 97#ifdef CONFIG_NET_POLL_CONTROLLER
1785 .ndo_poll_controller = vnet_poll_controller, 98 .ndo_poll_controller = sunvnet_poll_controller_common,
1786#endif 99#endif
1787}; 100};
1788 101
@@ -1908,15 +221,15 @@ static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1908} 221}
1909 222
1910static struct ldc_channel_config vnet_ldc_cfg = { 223static struct ldc_channel_config vnet_ldc_cfg = {
1911 .event = vnet_event, 224 .event = sunvnet_event_common,
1912 .mtu = 64, 225 .mtu = 64,
1913 .mode = LDC_MODE_UNRELIABLE, 226 .mode = LDC_MODE_UNRELIABLE,
1914}; 227};
1915 228
1916static struct vio_driver_ops vnet_vio_ops = { 229static struct vio_driver_ops vnet_vio_ops = {
1917 .send_attr = vnet_send_attr, 230 .send_attr = sunvnet_send_attr_common,
1918 .handle_attr = vnet_handle_attr, 231 .handle_attr = sunvnet_handle_attr_common,
1919 .handshake_complete = vnet_handshake_complete, 232 .handshake_complete = sunvnet_handshake_complete_common,
1920}; 233};
1921 234
1922static void print_version(void) 235static void print_version(void)
@@ -1926,25 +239,6 @@ static void print_version(void)
1926 239
1927const char *remote_macaddr_prop = "remote-mac-address"; 240const char *remote_macaddr_prop = "remote-mac-address";
1928 241
1929static void
1930vnet_port_add_txq(struct vnet_port *port)
1931{
1932 struct vnet *vp = port->vp;
1933 int n;
1934
1935 n = vp->nports++;
1936 n = n & (VNET_MAX_TXQS - 1);
1937 port->q_index = n;
1938 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1939}
1940
1941static void
1942vnet_port_rm_txq(struct vnet_port *port)
1943{
1944 port->vp->nports--;
1945 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1946}
1947
1948static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 242static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1949{ 243{
1950 struct mdesc_handle *hp; 244 struct mdesc_handle *hp;
@@ -1992,7 +286,8 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1992 if (err) 286 if (err)
1993 goto err_out_free_port; 287 goto err_out_free_port;
1994 288
1995 netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT); 289 netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
290 NAPI_POLL_WEIGHT);
1996 291
1997 INIT_HLIST_NODE(&port->hash); 292 INIT_HLIST_NODE(&port->hash);
1998 INIT_LIST_HEAD(&port->list); 293 INIT_LIST_HEAD(&port->list);
@@ -2011,7 +306,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2011 list_add_tail_rcu(&port->list, &vp->port_list); 306 list_add_tail_rcu(&port->list, &vp->port_list);
2012 hlist_add_head_rcu(&port->hash, 307 hlist_add_head_rcu(&port->hash,
2013 &vp->port_hash[vnet_hashfn(port->raddr)]); 308 &vp->port_hash[vnet_hashfn(port->raddr)]);
2014 vnet_port_add_txq(port); 309 sunvnet_port_add_txq_common(port);
2015 spin_unlock_irqrestore(&vp->lock, flags); 310 spin_unlock_irqrestore(&vp->lock, flags);
2016 311
2017 dev_set_drvdata(&vdev->dev, port); 312 dev_set_drvdata(&vdev->dev, port);
@@ -2019,7 +314,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2019 pr_info("%s: PORT ( remote-mac %pM%s )\n", 314 pr_info("%s: PORT ( remote-mac %pM%s )\n",
2020 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 315 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
2021 316
2022 setup_timer(&port->clean_timer, vnet_clean_timer_expire, 317 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
2023 (unsigned long)port); 318 (unsigned long)port);
2024 319
2025 napi_enable(&port->napi); 320 napi_enable(&port->napi);
@@ -2052,9 +347,9 @@ static int vnet_port_remove(struct vio_dev *vdev)
2052 347
2053 synchronize_rcu(); 348 synchronize_rcu();
2054 del_timer_sync(&port->clean_timer); 349 del_timer_sync(&port->clean_timer);
2055 vnet_port_rm_txq(port); 350 sunvnet_port_rm_txq_common(port);
2056 netif_napi_del(&port->napi); 351 netif_napi_del(&port->napi);
2057 vnet_port_free_tx_bufs(port); 352 sunvnet_port_free_tx_bufs_common(port);
2058 vio_ldc_free(&port->vio); 353 vio_ldc_free(&port->vio);
2059 354
2060 dev_set_drvdata(&vdev->dev, NULL); 355 dev_set_drvdata(&vdev->dev, NULL);
diff --git a/drivers/net/ethernet/sun/sunvnet_common.c b/drivers/net/ethernet/sun/sunvnet_common.c
new file mode 100644
index 000000000000..49e85d0d960b
--- /dev/null
+++ b/drivers/net/ethernet/sun/sunvnet_common.c
@@ -0,0 +1,1753 @@
1/* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5
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 <linux/highmem.h>
17#include <linux/if_vlan.h>
18#define CREATE_TRACE_POINTS
19#include <trace/events/sunvnet.h>
20
21#if IS_ENABLED(CONFIG_IPV6)
22#include <linux/icmpv6.h>
23#endif
24
25#include <net/ip.h>
26#include <net/icmp.h>
27#include <net/route.h>
28
29#include <asm/vio.h>
30#include <asm/ldc.h>
31
32#include "sunvnet_common.h"
33
34/* Heuristic for the number of times to exponentially backoff and
35 * retry sending an LDC trigger when EAGAIN is encountered
36 */
37#define VNET_MAX_RETRIES 10
38
39static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
40static void vnet_port_reset(struct vnet_port *port);
41
42static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
43{
44 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
45}
46
47static int vnet_handle_unknown(struct vnet_port *port, void *arg)
48{
49 struct vio_msg_tag *pkt = arg;
50
51 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
52 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
53 pr_err("Resetting connection\n");
54
55 ldc_disconnect(port->vio.lp);
56
57 return -ECONNRESET;
58}
59
60static int vnet_port_alloc_tx_ring(struct vnet_port *port);
61
62int sunvnet_send_attr_common(struct vio_driver_state *vio)
63{
64 struct vnet_port *port = to_vnet_port(vio);
65 struct net_device *dev = port->vp->dev;
66 struct vio_net_attr_info pkt;
67 int framelen = ETH_FRAME_LEN;
68 int i, err;
69
70 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
71 if (err)
72 return err;
73
74 memset(&pkt, 0, sizeof(pkt));
75 pkt.tag.type = VIO_TYPE_CTRL;
76 pkt.tag.stype = VIO_SUBTYPE_INFO;
77 pkt.tag.stype_env = VIO_ATTR_INFO;
78 pkt.tag.sid = vio_send_sid(vio);
79 if (vio_version_before(vio, 1, 2))
80 pkt.xfer_mode = VIO_DRING_MODE;
81 else
82 pkt.xfer_mode = VIO_NEW_DRING_MODE;
83 pkt.addr_type = VNET_ADDR_ETHERMAC;
84 pkt.ack_freq = 0;
85 for (i = 0; i < 6; i++)
86 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
87 if (vio_version_after(vio, 1, 3)) {
88 if (port->rmtu) {
89 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
90 pkt.mtu = port->rmtu;
91 } else {
92 port->rmtu = VNET_MAXPACKET;
93 pkt.mtu = port->rmtu;
94 }
95 if (vio_version_after_eq(vio, 1, 6))
96 pkt.options = VIO_TX_DRING;
97 } else if (vio_version_before(vio, 1, 3)) {
98 pkt.mtu = framelen;
99 } else { /* v1.3 */
100 pkt.mtu = framelen + VLAN_HLEN;
101 }
102
103 pkt.cflags = 0;
104 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
105 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
106 if (!port->tsolen)
107 port->tsolen = VNET_MAXTSO;
108 pkt.ipv4_lso_maxlen = port->tsolen;
109 }
110
111 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
112
113 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
114 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
115 "cflags[0x%04x] lso_max[%u]\n",
116 pkt.xfer_mode, pkt.addr_type,
117 (unsigned long long)pkt.addr,
118 pkt.ack_freq, pkt.plnk_updt, pkt.options,
119 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
120
121
122 return vio_ldc_send(vio, &pkt, sizeof(pkt));
123}
124EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
125
126static int handle_attr_info(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128{
129 struct vnet_port *port = to_vnet_port(vio);
130 u64 localmtu;
131 u8 xfer_mode;
132
133 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
136 pkt->xfer_mode, pkt->addr_type,
137 (unsigned long long)pkt->addr,
138 pkt->ack_freq, pkt->plnk_updt, pkt->options,
139 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
140 pkt->ipv4_lso_maxlen);
141
142 pkt->tag.sid = vio_send_sid(vio);
143
144 xfer_mode = pkt->xfer_mode;
145 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
146 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
147 xfer_mode = VIO_NEW_DRING_MODE;
148
149 /* MTU negotiation:
150 * < v1.3 - ETH_FRAME_LEN exactly
151 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
152 * pkt->mtu for ACK
153 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
154 */
155 if (vio_version_before(vio, 1, 3)) {
156 localmtu = ETH_FRAME_LEN;
157 } else if (vio_version_after(vio, 1, 3)) {
158 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
159 localmtu = min(pkt->mtu, localmtu);
160 pkt->mtu = localmtu;
161 } else { /* v1.3 */
162 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
163 }
164 port->rmtu = localmtu;
165
166 /* LSO negotiation */
167 if (vio_version_after_eq(vio, 1, 7))
168 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
169 else
170 port->tso = false;
171 if (port->tso) {
172 if (!port->tsolen)
173 port->tsolen = VNET_MAXTSO;
174 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
175 if (port->tsolen < VNET_MINTSO) {
176 port->tso = false;
177 port->tsolen = 0;
178 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
179 }
180 pkt->ipv4_lso_maxlen = port->tsolen;
181 } else {
182 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
183 pkt->ipv4_lso_maxlen = 0;
184 }
185
186 /* for version >= 1.6, ACK packet mode we support */
187 if (vio_version_after_eq(vio, 1, 6)) {
188 pkt->xfer_mode = VIO_NEW_DRING_MODE;
189 pkt->options = VIO_TX_DRING;
190 }
191
192 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
193 pkt->addr_type != VNET_ADDR_ETHERMAC ||
194 pkt->mtu != localmtu) {
195 viodbg(HS, "SEND NET ATTR NACK\n");
196
197 pkt->tag.stype = VIO_SUBTYPE_NACK;
198
199 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
200
201 return -ECONNRESET;
202 } else {
203 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
204 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
205 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
206 pkt->xfer_mode, pkt->addr_type,
207 (unsigned long long)pkt->addr,
208 pkt->ack_freq, pkt->plnk_updt, pkt->options,
209 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
210 pkt->ipv4_lso_maxlen);
211
212 pkt->tag.stype = VIO_SUBTYPE_ACK;
213
214 return vio_ldc_send(vio, pkt, sizeof(*pkt));
215 }
216
217}
218
219static int handle_attr_ack(struct vio_driver_state *vio,
220 struct vio_net_attr_info *pkt)
221{
222 viodbg(HS, "GOT NET ATTR ACK\n");
223
224 return 0;
225}
226
227static int handle_attr_nack(struct vio_driver_state *vio,
228 struct vio_net_attr_info *pkt)
229{
230 viodbg(HS, "GOT NET ATTR NACK\n");
231
232 return -ECONNRESET;
233}
234
235int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
236{
237 struct vio_net_attr_info *pkt = arg;
238
239 switch (pkt->tag.stype) {
240 case VIO_SUBTYPE_INFO:
241 return handle_attr_info(vio, pkt);
242
243 case VIO_SUBTYPE_ACK:
244 return handle_attr_ack(vio, pkt);
245
246 case VIO_SUBTYPE_NACK:
247 return handle_attr_nack(vio, pkt);
248
249 default:
250 return -ECONNRESET;
251 }
252}
253EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
254
255void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
256{
257 struct vio_dring_state *dr;
258
259 dr = &vio->drings[VIO_DRIVER_RX_RING];
260 dr->snd_nxt = dr->rcv_nxt = 1;
261
262 dr = &vio->drings[VIO_DRIVER_TX_RING];
263 dr->snd_nxt = dr->rcv_nxt = 1;
264}
265EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
266
267/* The hypervisor interface that implements copying to/from imported
268 * memory from another domain requires that copies are done to 8-byte
269 * aligned buffers, and that the lengths of such copies are also 8-byte
270 * multiples.
271 *
272 * So we align skb->data to an 8-byte multiple and pad-out the data
273 * area so we can round the copy length up to the next multiple of
274 * 8 for the copy.
275 *
276 * The transmitter puts the actual start of the packet 6 bytes into
277 * the buffer it sends over, so that the IP headers after the ethernet
278 * header are aligned properly. These 6 bytes are not in the descriptor
279 * length, they are simply implied. This offset is represented using
280 * the VNET_PACKET_SKIP macro.
281 */
282static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
283 unsigned int len)
284{
285 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
286 unsigned long addr, off;
287
288 if (unlikely(!skb))
289 return NULL;
290
291 addr = (unsigned long) skb->data;
292 off = ((addr + 7UL) & ~7UL) - addr;
293 if (off)
294 skb_reserve(skb, off);
295
296 return skb;
297}
298
299static inline void vnet_fullcsum(struct sk_buff *skb)
300{
301 struct iphdr *iph = ip_hdr(skb);
302 int offset = skb_transport_offset(skb);
303
304 if (skb->protocol != htons(ETH_P_IP))
305 return;
306 if (iph->protocol != IPPROTO_TCP &&
307 iph->protocol != IPPROTO_UDP)
308 return;
309 skb->ip_summed = CHECKSUM_NONE;
310 skb->csum_level = 1;
311 skb->csum = 0;
312 if (iph->protocol == IPPROTO_TCP) {
313 struct tcphdr *ptcp = tcp_hdr(skb);
314
315 ptcp->check = 0;
316 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
317 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
318 skb->len - offset, IPPROTO_TCP,
319 skb->csum);
320 } else if (iph->protocol == IPPROTO_UDP) {
321 struct udphdr *pudp = udp_hdr(skb);
322
323 pudp->check = 0;
324 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
325 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
326 skb->len - offset, IPPROTO_UDP,
327 skb->csum);
328 }
329}
330
331static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
332{
333 struct net_device *dev = port->vp->dev;
334 unsigned int len = desc->size;
335 unsigned int copy_len;
336 struct sk_buff *skb;
337 int maxlen;
338 int err;
339
340 err = -EMSGSIZE;
341 if (port->tso && port->tsolen > port->rmtu)
342 maxlen = port->tsolen;
343 else
344 maxlen = port->rmtu;
345 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
346 dev->stats.rx_length_errors++;
347 goto out_dropped;
348 }
349
350 skb = alloc_and_align_skb(dev, len);
351 err = -ENOMEM;
352 if (unlikely(!skb)) {
353 dev->stats.rx_missed_errors++;
354 goto out_dropped;
355 }
356
357 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
358 skb_put(skb, copy_len);
359 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
360 skb->data, copy_len, 0,
361 desc->cookies, desc->ncookies);
362 if (unlikely(err < 0)) {
363 dev->stats.rx_frame_errors++;
364 goto out_free_skb;
365 }
366
367 skb_pull(skb, VNET_PACKET_SKIP);
368 skb_trim(skb, len);
369 skb->protocol = eth_type_trans(skb, dev);
370
371 if (vio_version_after_eq(&port->vio, 1, 8)) {
372 struct vio_net_dext *dext = vio_net_ext(desc);
373
374 skb_reset_network_header(skb);
375
376 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
377 if (skb->protocol == ETH_P_IP) {
378 struct iphdr *iph = ip_hdr(skb);
379
380 iph->check = 0;
381 ip_send_check(iph);
382 }
383 }
384 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
385 skb->ip_summed == CHECKSUM_NONE) {
386 if (skb->protocol == htons(ETH_P_IP)) {
387 struct iphdr *iph = ip_hdr(skb);
388 int ihl = iph->ihl * 4;
389
390 skb_reset_transport_header(skb);
391 skb_set_transport_header(skb, ihl);
392 vnet_fullcsum(skb);
393 }
394 }
395 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
396 skb->ip_summed = CHECKSUM_PARTIAL;
397 skb->csum_level = 0;
398 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
399 skb->csum_level = 1;
400 }
401 }
402
403 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
404
405 dev->stats.rx_packets++;
406 dev->stats.rx_bytes += len;
407 napi_gro_receive(&port->napi, skb);
408 return 0;
409
410out_free_skb:
411 kfree_skb(skb);
412
413out_dropped:
414 dev->stats.rx_dropped++;
415 return err;
416}
417
418static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
419 u32 start, u32 end, u8 vio_dring_state)
420{
421 struct vio_dring_data hdr = {
422 .tag = {
423 .type = VIO_TYPE_DATA,
424 .stype = VIO_SUBTYPE_ACK,
425 .stype_env = VIO_DRING_DATA,
426 .sid = vio_send_sid(&port->vio),
427 },
428 .dring_ident = dr->ident,
429 .start_idx = start,
430 .end_idx = end,
431 .state = vio_dring_state,
432 };
433 int err, delay;
434 int retries = 0;
435
436 hdr.seq = dr->snd_nxt;
437 delay = 1;
438 do {
439 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
440 if (err > 0) {
441 dr->snd_nxt++;
442 break;
443 }
444 udelay(delay);
445 if ((delay <<= 1) > 128)
446 delay = 128;
447 if (retries++ > VNET_MAX_RETRIES) {
448 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
449 port->raddr[0], port->raddr[1],
450 port->raddr[2], port->raddr[3],
451 port->raddr[4], port->raddr[5]);
452 break;
453 }
454 } while (err == -EAGAIN);
455
456 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
457 port->stop_rx_idx = end;
458 port->stop_rx = true;
459 } else {
460 port->stop_rx_idx = 0;
461 port->stop_rx = false;
462 }
463
464 return err;
465}
466
467static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
468 struct vio_dring_state *dr,
469 u32 index)
470{
471 struct vio_net_desc *desc = port->vio.desc_buf;
472 int err;
473
474 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
475 (index * dr->entry_size),
476 dr->cookies, dr->ncookies);
477 if (err < 0)
478 return ERR_PTR(err);
479
480 return desc;
481}
482
483static int put_rx_desc(struct vnet_port *port,
484 struct vio_dring_state *dr,
485 struct vio_net_desc *desc,
486 u32 index)
487{
488 int err;
489
490 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
491 (index * dr->entry_size),
492 dr->cookies, dr->ncookies);
493 if (err < 0)
494 return err;
495
496 return 0;
497}
498
499static int vnet_walk_rx_one(struct vnet_port *port,
500 struct vio_dring_state *dr,
501 u32 index, int *needs_ack)
502{
503 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
504 struct vio_driver_state *vio = &port->vio;
505 int err;
506
507 BUG_ON(desc == NULL);
508 if (IS_ERR(desc))
509 return PTR_ERR(desc);
510
511 if (desc->hdr.state != VIO_DESC_READY)
512 return 1;
513
514 dma_rmb();
515
516 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
517 desc->hdr.state, desc->hdr.ack,
518 desc->size, desc->ncookies,
519 desc->cookies[0].cookie_addr,
520 desc->cookies[0].cookie_size);
521
522 err = vnet_rx_one(port, desc);
523 if (err == -ECONNRESET)
524 return err;
525 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
526 index, desc->hdr.ack);
527 desc->hdr.state = VIO_DESC_DONE;
528 err = put_rx_desc(port, dr, desc, index);
529 if (err < 0)
530 return err;
531 *needs_ack = desc->hdr.ack;
532 return 0;
533}
534
535static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
536 u32 start, u32 end, int *npkts, int budget)
537{
538 struct vio_driver_state *vio = &port->vio;
539 int ack_start = -1, ack_end = -1;
540 bool send_ack = true;
541
542 end = (end == (u32) -1) ? vio_dring_prev(dr, start)
543 : vio_dring_next(dr, end);
544
545 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
546
547 while (start != end) {
548 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
549 if (err == -ECONNRESET)
550 return err;
551 if (err != 0)
552 break;
553 (*npkts)++;
554 if (ack_start == -1)
555 ack_start = start;
556 ack_end = start;
557 start = vio_dring_next(dr, start);
558 if (ack && start != end) {
559 err = vnet_send_ack(port, dr, ack_start, ack_end,
560 VIO_DRING_ACTIVE);
561 if (err == -ECONNRESET)
562 return err;
563 ack_start = -1;
564 }
565 if ((*npkts) >= budget) {
566 send_ack = false;
567 break;
568 }
569 }
570 if (unlikely(ack_start == -1))
571 ack_start = ack_end = vio_dring_prev(dr, start);
572 if (send_ack) {
573 port->napi_resume = false;
574 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
575 port->vio._peer_sid,
576 ack_end, *npkts);
577 return vnet_send_ack(port, dr, ack_start, ack_end,
578 VIO_DRING_STOPPED);
579 } else {
580 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
581 port->vio._peer_sid,
582 ack_end, *npkts);
583 port->napi_resume = true;
584 port->napi_stop_idx = ack_end;
585 return 1;
586 }
587}
588
589static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
590 int budget)
591{
592 struct vio_dring_data *pkt = msgbuf;
593 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
594 struct vio_driver_state *vio = &port->vio;
595
596 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
597 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
598
599 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
600 return 0;
601 if (unlikely(pkt->seq != dr->rcv_nxt)) {
602 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
603 pkt->seq, dr->rcv_nxt);
604 return 0;
605 }
606
607 if (!port->napi_resume)
608 dr->rcv_nxt++;
609
610 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
611
612 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
613 npkts, budget);
614}
615
616static int idx_is_pending(struct vio_dring_state *dr, u32 end)
617{
618 u32 idx = dr->cons;
619 int found = 0;
620
621 while (idx != dr->prod) {
622 if (idx == end) {
623 found = 1;
624 break;
625 }
626 idx = vio_dring_next(dr, idx);
627 }
628 return found;
629}
630
631static int vnet_ack(struct vnet_port *port, void *msgbuf)
632{
633 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
634 struct vio_dring_data *pkt = msgbuf;
635 struct net_device *dev;
636 struct vnet *vp;
637 u32 end;
638 struct vio_net_desc *desc;
639 struct netdev_queue *txq;
640
641 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
642 return 0;
643
644 end = pkt->end_idx;
645 vp = port->vp;
646 dev = vp->dev;
647 netif_tx_lock(dev);
648 if (unlikely(!idx_is_pending(dr, end))) {
649 netif_tx_unlock(dev);
650 return 0;
651 }
652
653 /* sync for race conditions with vnet_start_xmit() and tell xmit it
654 * is time to send a trigger.
655 */
656 trace_vnet_rx_stopped_ack(port->vio._local_sid,
657 port->vio._peer_sid, end);
658 dr->cons = vio_dring_next(dr, end);
659 desc = vio_dring_entry(dr, dr->cons);
660 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
661 /* vnet_start_xmit() just populated this dring but missed
662 * sending the "start" LDC message to the consumer.
663 * Send a "start" trigger on its behalf.
664 */
665 if (__vnet_tx_trigger(port, dr->cons) > 0)
666 port->start_cons = false;
667 else
668 port->start_cons = true;
669 } else {
670 port->start_cons = true;
671 }
672 netif_tx_unlock(dev);
673
674 txq = netdev_get_tx_queue(dev, port->q_index);
675 if (unlikely(netif_tx_queue_stopped(txq) &&
676 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
677 return 1;
678
679 return 0;
680}
681
682static int vnet_nack(struct vnet_port *port, void *msgbuf)
683{
684 /* XXX just reset or similar XXX */
685 return 0;
686}
687
688static int handle_mcast(struct vnet_port *port, void *msgbuf)
689{
690 struct vio_net_mcast_info *pkt = msgbuf;
691
692 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
693 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
694 port->vp->dev->name,
695 pkt->tag.type,
696 pkt->tag.stype,
697 pkt->tag.stype_env,
698 pkt->tag.sid);
699
700 return 0;
701}
702
703/* Got back a STOPPED LDC message on port. If the queue is stopped,
704 * wake it up so that we'll send out another START message at the
705 * next TX.
706 */
707static void maybe_tx_wakeup(struct vnet_port *port)
708{
709 struct netdev_queue *txq;
710
711 txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
712 __netif_tx_lock(txq, smp_processor_id());
713 if (likely(netif_tx_queue_stopped(txq))) {
714 struct vio_dring_state *dr;
715
716 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
717 netif_tx_wake_queue(txq);
718 }
719 __netif_tx_unlock(txq);
720}
721
722static inline bool port_is_up(struct vnet_port *vnet)
723{
724 struct vio_driver_state *vio = &vnet->vio;
725
726 return !!(vio->hs_state & VIO_HS_COMPLETE);
727}
728
729static int vnet_event_napi(struct vnet_port *port, int budget)
730{
731 struct vio_driver_state *vio = &port->vio;
732 int tx_wakeup, err;
733 int npkts = 0;
734 int event = (port->rx_event & LDC_EVENT_RESET);
735
736ldc_ctrl:
737 if (unlikely(event == LDC_EVENT_RESET ||
738 event == LDC_EVENT_UP)) {
739 vio_link_state_change(vio, event);
740
741 if (event == LDC_EVENT_RESET) {
742 vnet_port_reset(port);
743 vio_port_up(vio);
744 }
745 port->rx_event = 0;
746 return 0;
747 }
748 /* We may have multiple LDC events in rx_event. Unroll send_events() */
749 event = (port->rx_event & LDC_EVENT_UP);
750 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
751 if (event == LDC_EVENT_UP)
752 goto ldc_ctrl;
753 event = port->rx_event;
754 if (!(event & LDC_EVENT_DATA_READY))
755 return 0;
756
757 /* we dont expect any other bits than RESET, UP, DATA_READY */
758 BUG_ON(event != LDC_EVENT_DATA_READY);
759
760 tx_wakeup = err = 0;
761 while (1) {
762 union {
763 struct vio_msg_tag tag;
764 u64 raw[8];
765 } msgbuf;
766
767 if (port->napi_resume) {
768 struct vio_dring_data *pkt =
769 (struct vio_dring_data *)&msgbuf;
770 struct vio_dring_state *dr =
771 &port->vio.drings[VIO_DRIVER_RX_RING];
772
773 pkt->tag.type = VIO_TYPE_DATA;
774 pkt->tag.stype = VIO_SUBTYPE_INFO;
775 pkt->tag.stype_env = VIO_DRING_DATA;
776 pkt->seq = dr->rcv_nxt;
777 pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
778 pkt->end_idx = -1;
779 goto napi_resume;
780 }
781 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
782 if (unlikely(err < 0)) {
783 if (err == -ECONNRESET)
784 vio_conn_reset(vio);
785 break;
786 }
787 if (err == 0)
788 break;
789 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
790 msgbuf.tag.type,
791 msgbuf.tag.stype,
792 msgbuf.tag.stype_env,
793 msgbuf.tag.sid);
794 err = vio_validate_sid(vio, &msgbuf.tag);
795 if (err < 0)
796 break;
797napi_resume:
798 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
799 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
800 if (!port_is_up(port)) {
801 /* failures like handshake_failure()
802 * may have cleaned up dring, but
803 * NAPI polling may bring us here.
804 */
805 err = -ECONNRESET;
806 break;
807 }
808 err = vnet_rx(port, &msgbuf, &npkts, budget);
809 if (npkts >= budget)
810 break;
811 if (npkts == 0)
812 break;
813 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
814 err = vnet_ack(port, &msgbuf);
815 if (err > 0)
816 tx_wakeup |= err;
817 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
818 err = vnet_nack(port, &msgbuf);
819 }
820 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
821 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
822 err = handle_mcast(port, &msgbuf);
823 else
824 err = vio_control_pkt_engine(vio, &msgbuf);
825 if (err)
826 break;
827 } else {
828 err = vnet_handle_unknown(port, &msgbuf);
829 }
830 if (err == -ECONNRESET)
831 break;
832 }
833 if (unlikely(tx_wakeup && err != -ECONNRESET))
834 maybe_tx_wakeup(port);
835 return npkts;
836}
837
838int sunvnet_poll_common(struct napi_struct *napi, int budget)
839{
840 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
841 struct vio_driver_state *vio = &port->vio;
842 int processed = vnet_event_napi(port, budget);
843
844 if (processed < budget) {
845 napi_complete(napi);
846 port->rx_event &= ~LDC_EVENT_DATA_READY;
847 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
848 }
849 return processed;
850}
851EXPORT_SYMBOL_GPL(sunvnet_poll_common);
852
853void sunvnet_event_common(void *arg, int event)
854{
855 struct vnet_port *port = arg;
856 struct vio_driver_state *vio = &port->vio;
857
858 port->rx_event |= event;
859 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
860 napi_schedule(&port->napi);
861
862}
863EXPORT_SYMBOL_GPL(sunvnet_event_common);
864
865static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
866{
867 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
868 struct vio_dring_data hdr = {
869 .tag = {
870 .type = VIO_TYPE_DATA,
871 .stype = VIO_SUBTYPE_INFO,
872 .stype_env = VIO_DRING_DATA,
873 .sid = vio_send_sid(&port->vio),
874 },
875 .dring_ident = dr->ident,
876 .start_idx = start,
877 .end_idx = (u32) -1,
878 };
879 int err, delay;
880 int retries = 0;
881
882 if (port->stop_rx) {
883 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
884 port->vio._peer_sid,
885 port->stop_rx_idx, -1);
886 err = vnet_send_ack(port,
887 &port->vio.drings[VIO_DRIVER_RX_RING],
888 port->stop_rx_idx, -1,
889 VIO_DRING_STOPPED);
890 if (err <= 0)
891 return err;
892 }
893
894 hdr.seq = dr->snd_nxt;
895 delay = 1;
896 do {
897 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
898 if (err > 0) {
899 dr->snd_nxt++;
900 break;
901 }
902 udelay(delay);
903 if ((delay <<= 1) > 128)
904 delay = 128;
905 if (retries++ > VNET_MAX_RETRIES)
906 break;
907 } while (err == -EAGAIN);
908 trace_vnet_tx_trigger(port->vio._local_sid,
909 port->vio._peer_sid, start, err);
910
911 return err;
912}
913
914static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
915{
916 unsigned int hash = vnet_hashfn(skb->data);
917 struct hlist_head *hp = &vp->port_hash[hash];
918 struct vnet_port *port;
919
920 hlist_for_each_entry_rcu(port, hp, hash) {
921 if (!port_is_up(port))
922 continue;
923 if (ether_addr_equal(port->raddr, skb->data))
924 return port;
925 }
926 list_for_each_entry_rcu(port, &vp->port_list, list) {
927 if (!port->switch_port)
928 continue;
929 if (!port_is_up(port))
930 continue;
931 return port;
932 }
933 return NULL;
934}
935
936static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
937 unsigned *pending)
938{
939 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
940 struct sk_buff *skb = NULL;
941 int i, txi;
942
943 *pending = 0;
944
945 txi = dr->prod;
946 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
947 struct vio_net_desc *d;
948
949 --txi;
950 if (txi < 0)
951 txi = VNET_TX_RING_SIZE-1;
952
953 d = vio_dring_entry(dr, txi);
954
955 if (d->hdr.state == VIO_DESC_READY) {
956 (*pending)++;
957 continue;
958 }
959 if (port->tx_bufs[txi].skb) {
960 if (d->hdr.state != VIO_DESC_DONE)
961 pr_notice("invalid ring buffer state %d\n",
962 d->hdr.state);
963 BUG_ON(port->tx_bufs[txi].skb->next);
964
965 port->tx_bufs[txi].skb->next = skb;
966 skb = port->tx_bufs[txi].skb;
967 port->tx_bufs[txi].skb = NULL;
968
969 ldc_unmap(port->vio.lp,
970 port->tx_bufs[txi].cookies,
971 port->tx_bufs[txi].ncookies);
972 } else if (d->hdr.state == VIO_DESC_FREE)
973 break;
974 d->hdr.state = VIO_DESC_FREE;
975 }
976 return skb;
977}
978
979static inline void vnet_free_skbs(struct sk_buff *skb)
980{
981 struct sk_buff *next;
982
983 while (skb) {
984 next = skb->next;
985 skb->next = NULL;
986 dev_kfree_skb(skb);
987 skb = next;
988 }
989}
990
991void sunvnet_clean_timer_expire_common(unsigned long port0)
992{
993 struct vnet_port *port = (struct vnet_port *)port0;
994 struct sk_buff *freeskbs;
995 unsigned pending;
996
997 netif_tx_lock(port->vp->dev);
998 freeskbs = vnet_clean_tx_ring(port, &pending);
999 netif_tx_unlock(port->vp->dev);
1000
1001 vnet_free_skbs(freeskbs);
1002
1003 if (pending)
1004 (void)mod_timer(&port->clean_timer,
1005 jiffies + VNET_CLEAN_TIMEOUT);
1006 else
1007 del_timer(&port->clean_timer);
1008}
1009EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
1010
1011static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1012 struct ldc_trans_cookie *cookies, int ncookies,
1013 unsigned int map_perm)
1014{
1015 int i, nc, err, blen;
1016
1017 /* header */
1018 blen = skb_headlen(skb);
1019 if (blen < ETH_ZLEN)
1020 blen = ETH_ZLEN;
1021 blen += VNET_PACKET_SKIP;
1022 blen += 8 - (blen & 7);
1023
1024 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1025 ncookies, map_perm);
1026 if (err < 0)
1027 return err;
1028 nc = err;
1029
1030 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1031 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1032 u8 *vaddr;
1033
1034 if (nc < ncookies) {
1035 vaddr = kmap_atomic(skb_frag_page(f));
1036 blen = skb_frag_size(f);
1037 blen += 8 - (blen & 7);
1038 err = ldc_map_single(lp, vaddr + f->page_offset,
1039 blen, cookies + nc, ncookies - nc,
1040 map_perm);
1041 kunmap_atomic(vaddr);
1042 } else {
1043 err = -EMSGSIZE;
1044 }
1045
1046 if (err < 0) {
1047 ldc_unmap(lp, cookies, nc);
1048 return err;
1049 }
1050 nc += err;
1051 }
1052 return nc;
1053}
1054
1055static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1056{
1057 struct sk_buff *nskb;
1058 int i, len, pad, docopy;
1059
1060 len = skb->len;
1061 pad = 0;
1062 if (len < ETH_ZLEN) {
1063 pad += ETH_ZLEN - skb->len;
1064 len += pad;
1065 }
1066 len += VNET_PACKET_SKIP;
1067 pad += 8 - (len & 7);
1068
1069 /* make sure we have enough cookies and alignment in every frag */
1070 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1071 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1072 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1073
1074 docopy |= f->page_offset & 7;
1075 }
1076 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1077 skb_tailroom(skb) < pad ||
1078 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1079 int start = 0, offset;
1080 __wsum csum;
1081
1082 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1083 nskb = alloc_and_align_skb(skb->dev, len);
1084 if (nskb == NULL) {
1085 dev_kfree_skb(skb);
1086 return NULL;
1087 }
1088 skb_reserve(nskb, VNET_PACKET_SKIP);
1089
1090 nskb->protocol = skb->protocol;
1091 offset = skb_mac_header(skb) - skb->data;
1092 skb_set_mac_header(nskb, offset);
1093 offset = skb_network_header(skb) - skb->data;
1094 skb_set_network_header(nskb, offset);
1095 offset = skb_transport_header(skb) - skb->data;
1096 skb_set_transport_header(nskb, offset);
1097
1098 offset = 0;
1099 nskb->csum_offset = skb->csum_offset;
1100 nskb->ip_summed = skb->ip_summed;
1101
1102 if (skb->ip_summed == CHECKSUM_PARTIAL)
1103 start = skb_checksum_start_offset(skb);
1104 if (start) {
1105 struct iphdr *iph = ip_hdr(nskb);
1106 int offset = start + nskb->csum_offset;
1107
1108 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1109 dev_kfree_skb(nskb);
1110 dev_kfree_skb(skb);
1111 return NULL;
1112 }
1113 *(__sum16 *)(skb->data + offset) = 0;
1114 csum = skb_copy_and_csum_bits(skb, start,
1115 nskb->data + start,
1116 skb->len - start, 0);
1117 if (iph->protocol == IPPROTO_TCP ||
1118 iph->protocol == IPPROTO_UDP) {
1119 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1120 skb->len - start,
1121 iph->protocol, csum);
1122 }
1123 *(__sum16 *)(nskb->data + offset) = csum;
1124
1125 nskb->ip_summed = CHECKSUM_NONE;
1126 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1127 dev_kfree_skb(nskb);
1128 dev_kfree_skb(skb);
1129 return NULL;
1130 }
1131 (void)skb_put(nskb, skb->len);
1132 if (skb_is_gso(skb)) {
1133 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1134 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1135 }
1136 nskb->queue_mapping = skb->queue_mapping;
1137 dev_kfree_skb(skb);
1138 skb = nskb;
1139 }
1140 return skb;
1141}
1142
1143u16 sunvnet_select_queue_common(struct net_device *dev, struct sk_buff *skb,
1144 void *accel_priv, select_queue_fallback_t fallback)
1145{
1146 struct vnet *vp = netdev_priv(dev);
1147 struct vnet_port *port = __tx_port_find(vp, skb);
1148
1149 if (port == NULL)
1150 return 0;
1151 return port->q_index;
1152}
1153EXPORT_SYMBOL_GPL(sunvnet_select_queue_common);
1154
1155static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1156{
1157 struct net_device *dev = port->vp->dev;
1158 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1159 struct sk_buff *segs;
1160 int maclen, datalen;
1161 int status;
1162 int gso_size, gso_type, gso_segs;
1163 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1164 int proto = IPPROTO_IP;
1165
1166 if (skb->protocol == htons(ETH_P_IP))
1167 proto = ip_hdr(skb)->protocol;
1168 else if (skb->protocol == htons(ETH_P_IPV6))
1169 proto = ipv6_hdr(skb)->nexthdr;
1170
1171 if (proto == IPPROTO_TCP)
1172 hlen += tcp_hdr(skb)->doff * 4;
1173 else if (proto == IPPROTO_UDP)
1174 hlen += sizeof(struct udphdr);
1175 else {
1176 pr_err("vnet_handle_offloads GSO with unknown transport "
1177 "protocol %d tproto %d\n", skb->protocol, proto);
1178 hlen = 128; /* XXX */
1179 }
1180 datalen = port->tsolen - hlen;
1181
1182 gso_size = skb_shinfo(skb)->gso_size;
1183 gso_type = skb_shinfo(skb)->gso_type;
1184 gso_segs = skb_shinfo(skb)->gso_segs;
1185
1186 if (port->tso && gso_size < datalen)
1187 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1188
1189 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1190 struct netdev_queue *txq;
1191
1192 txq = netdev_get_tx_queue(dev, port->q_index);
1193 netif_tx_stop_queue(txq);
1194 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1195 return NETDEV_TX_BUSY;
1196 netif_tx_wake_queue(txq);
1197 }
1198
1199 maclen = skb_network_header(skb) - skb_mac_header(skb);
1200 skb_pull(skb, maclen);
1201
1202 if (port->tso && gso_size < datalen) {
1203 if (skb_unclone(skb, GFP_ATOMIC))
1204 goto out_dropped;
1205
1206 /* segment to TSO size */
1207 skb_shinfo(skb)->gso_size = datalen;
1208 skb_shinfo(skb)->gso_segs = gso_segs;
1209 }
1210 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1211 if (IS_ERR(segs))
1212 goto out_dropped;
1213
1214 skb_push(skb, maclen);
1215 skb_reset_mac_header(skb);
1216
1217 status = 0;
1218 while (segs) {
1219 struct sk_buff *curr = segs;
1220
1221 segs = segs->next;
1222 curr->next = NULL;
1223 if (port->tso && curr->len > dev->mtu) {
1224 skb_shinfo(curr)->gso_size = gso_size;
1225 skb_shinfo(curr)->gso_type = gso_type;
1226 skb_shinfo(curr)->gso_segs =
1227 DIV_ROUND_UP(curr->len - hlen, gso_size);
1228 } else
1229 skb_shinfo(curr)->gso_size = 0;
1230
1231 skb_push(curr, maclen);
1232 skb_reset_mac_header(curr);
1233 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1234 maclen);
1235 curr->csum_start = skb_transport_header(curr) - curr->head;
1236 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1237 curr->csum_offset = offsetof(struct tcphdr, check);
1238 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1239 curr->csum_offset = offsetof(struct udphdr, check);
1240
1241 if (!(status & NETDEV_TX_MASK))
1242 status = sunvnet_start_xmit_common(curr, dev);
1243 if (status & NETDEV_TX_MASK)
1244 dev_kfree_skb_any(curr);
1245 }
1246
1247 if (!(status & NETDEV_TX_MASK))
1248 dev_kfree_skb_any(skb);
1249 return status;
1250out_dropped:
1251 dev->stats.tx_dropped++;
1252 dev_kfree_skb_any(skb);
1253 return NETDEV_TX_OK;
1254}
1255
1256int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev)
1257{
1258 struct vnet *vp = netdev_priv(dev);
1259 struct vnet_port *port = NULL;
1260 struct vio_dring_state *dr;
1261 struct vio_net_desc *d;
1262 unsigned int len;
1263 struct sk_buff *freeskbs = NULL;
1264 int i, err, txi;
1265 unsigned pending = 0;
1266 struct netdev_queue *txq;
1267
1268 rcu_read_lock();
1269 port = __tx_port_find(vp, skb);
1270 if (unlikely(!port)) {
1271 rcu_read_unlock();
1272 goto out_dropped;
1273 }
1274
1275 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1276 err = vnet_handle_offloads(port, skb);
1277 rcu_read_unlock();
1278 return err;
1279 }
1280
1281 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1282 unsigned long localmtu = port->rmtu - ETH_HLEN;
1283
1284 if (vio_version_after_eq(&port->vio, 1, 3))
1285 localmtu -= VLAN_HLEN;
1286
1287 if (skb->protocol == htons(ETH_P_IP)) {
1288 struct flowi4 fl4;
1289 struct rtable *rt = NULL;
1290
1291 memset(&fl4, 0, sizeof(fl4));
1292 fl4.flowi4_oif = dev->ifindex;
1293 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1294 fl4.daddr = ip_hdr(skb)->daddr;
1295 fl4.saddr = ip_hdr(skb)->saddr;
1296
1297 rt = ip_route_output_key(dev_net(dev), &fl4);
1298 rcu_read_unlock();
1299 if (!IS_ERR(rt)) {
1300 skb_dst_set(skb, &rt->dst);
1301 icmp_send(skb, ICMP_DEST_UNREACH,
1302 ICMP_FRAG_NEEDED,
1303 htonl(localmtu));
1304 }
1305 }
1306#if IS_ENABLED(CONFIG_IPV6)
1307 else if (skb->protocol == htons(ETH_P_IPV6))
1308 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1309#endif
1310 goto out_dropped;
1311 }
1312
1313 skb = vnet_skb_shape(skb, 2);
1314
1315 if (unlikely(!skb))
1316 goto out_dropped;
1317
1318 if (skb->ip_summed == CHECKSUM_PARTIAL)
1319 vnet_fullcsum(skb);
1320
1321 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1322 i = skb_get_queue_mapping(skb);
1323 txq = netdev_get_tx_queue(dev, i);
1324 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1325 if (!netif_tx_queue_stopped(txq)) {
1326 netif_tx_stop_queue(txq);
1327
1328 /* This is a hard error, log it. */
1329 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1330 dev->stats.tx_errors++;
1331 }
1332 rcu_read_unlock();
1333 return NETDEV_TX_BUSY;
1334 }
1335
1336 d = vio_dring_cur(dr);
1337
1338 txi = dr->prod;
1339
1340 freeskbs = vnet_clean_tx_ring(port, &pending);
1341
1342 BUG_ON(port->tx_bufs[txi].skb);
1343
1344 len = skb->len;
1345 if (len < ETH_ZLEN)
1346 len = ETH_ZLEN;
1347
1348 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1349 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1350 if (err < 0) {
1351 netdev_info(dev, "tx buffer map error %d\n", err);
1352 goto out_dropped;
1353 }
1354
1355 port->tx_bufs[txi].skb = skb;
1356 skb = NULL;
1357 port->tx_bufs[txi].ncookies = err;
1358
1359 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1360 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1361 * the protocol itself does not require it as long as the peer
1362 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1363 *
1364 * An ACK for every packet in the ring is expensive as the
1365 * sending of LDC messages is slow and affects performance.
1366 */
1367 d->hdr.ack = VIO_ACK_DISABLE;
1368 d->size = len;
1369 d->ncookies = port->tx_bufs[txi].ncookies;
1370 for (i = 0; i < d->ncookies; i++)
1371 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1372 if (vio_version_after_eq(&port->vio, 1, 7)) {
1373 struct vio_net_dext *dext = vio_net_ext(d);
1374
1375 memset(dext, 0, sizeof(*dext));
1376 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1377 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1378 ->gso_size;
1379 dext->flags |= VNET_PKT_IPV4_LSO;
1380 }
1381 if (vio_version_after_eq(&port->vio, 1, 8) &&
1382 !port->switch_port) {
1383 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1384 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1385 }
1386 }
1387
1388 /* This has to be a non-SMP write barrier because we are writing
1389 * to memory which is shared with the peer LDOM.
1390 */
1391 dma_wmb();
1392
1393 d->hdr.state = VIO_DESC_READY;
1394
1395 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1396 * to notify the consumer that some descriptors are READY.
1397 * After that "start" trigger, no additional triggers are needed until
1398 * a DRING_STOPPED is received from the consumer. The dr->cons field
1399 * (set up by vnet_ack()) has the value of the next dring index
1400 * that has not yet been ack-ed. We send a "start" trigger here
1401 * if, and only if, start_cons is true (reset it afterward). Conversely,
1402 * vnet_ack() should check if the dring corresponding to cons
1403 * is marked READY, but start_cons was false.
1404 * If so, vnet_ack() should send out the missed "start" trigger.
1405 *
1406 * Note that the dma_wmb() above makes sure the cookies et al. are
1407 * not globally visible before the VIO_DESC_READY, and that the
1408 * stores are ordered correctly by the compiler. The consumer will
1409 * not proceed until the VIO_DESC_READY is visible assuring that
1410 * the consumer does not observe anything related to descriptors
1411 * out of order. The HV trap from the LDC start trigger is the
1412 * producer to consumer announcement that work is available to the
1413 * consumer
1414 */
1415 if (!port->start_cons) { /* previous trigger suffices */
1416 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1417 port->vio._peer_sid, dr->cons);
1418 goto ldc_start_done;
1419 }
1420
1421 err = __vnet_tx_trigger(port, dr->cons);
1422 if (unlikely(err < 0)) {
1423 netdev_info(dev, "TX trigger error %d\n", err);
1424 d->hdr.state = VIO_DESC_FREE;
1425 skb = port->tx_bufs[txi].skb;
1426 port->tx_bufs[txi].skb = NULL;
1427 dev->stats.tx_carrier_errors++;
1428 goto out_dropped;
1429 }
1430
1431ldc_start_done:
1432 port->start_cons = false;
1433
1434 dev->stats.tx_packets++;
1435 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1436
1437 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1438 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1439 netif_tx_stop_queue(txq);
1440 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1441 netif_tx_wake_queue(txq);
1442 }
1443
1444 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1445 rcu_read_unlock();
1446
1447 vnet_free_skbs(freeskbs);
1448
1449 return NETDEV_TX_OK;
1450
1451out_dropped:
1452 if (pending)
1453 (void)mod_timer(&port->clean_timer,
1454 jiffies + VNET_CLEAN_TIMEOUT);
1455 else if (port)
1456 del_timer(&port->clean_timer);
1457 if (port)
1458 rcu_read_unlock();
1459 if (skb)
1460 dev_kfree_skb(skb);
1461 vnet_free_skbs(freeskbs);
1462 dev->stats.tx_dropped++;
1463 return NETDEV_TX_OK;
1464}
1465EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1466
1467void sunvnet_tx_timeout_common(struct net_device *dev)
1468{
1469 /* XXX Implement me XXX */
1470}
1471EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1472
1473int sunvnet_open_common(struct net_device *dev)
1474{
1475 netif_carrier_on(dev);
1476 netif_tx_start_all_queues(dev);
1477
1478 return 0;
1479}
1480EXPORT_SYMBOL_GPL(sunvnet_open_common);
1481
1482int sunvnet_close_common(struct net_device *dev)
1483{
1484 netif_tx_stop_all_queues(dev);
1485 netif_carrier_off(dev);
1486
1487 return 0;
1488}
1489EXPORT_SYMBOL_GPL(sunvnet_close_common);
1490
1491static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1492{
1493 struct vnet_mcast_entry *m;
1494
1495 for (m = vp->mcast_list; m; m = m->next) {
1496 if (ether_addr_equal(m->addr, addr))
1497 return m;
1498 }
1499 return NULL;
1500}
1501
1502static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1503{
1504 struct netdev_hw_addr *ha;
1505
1506 netdev_for_each_mc_addr(ha, dev) {
1507 struct vnet_mcast_entry *m;
1508
1509 m = __vnet_mc_find(vp, ha->addr);
1510 if (m) {
1511 m->hit = 1;
1512 continue;
1513 }
1514
1515 if (!m) {
1516 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1517 if (!m)
1518 continue;
1519 memcpy(m->addr, ha->addr, ETH_ALEN);
1520 m->hit = 1;
1521
1522 m->next = vp->mcast_list;
1523 vp->mcast_list = m;
1524 }
1525 }
1526}
1527
1528static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1529{
1530 struct vio_net_mcast_info info;
1531 struct vnet_mcast_entry *m, **pp;
1532 int n_addrs;
1533
1534 memset(&info, 0, sizeof(info));
1535
1536 info.tag.type = VIO_TYPE_CTRL;
1537 info.tag.stype = VIO_SUBTYPE_INFO;
1538 info.tag.stype_env = VNET_MCAST_INFO;
1539 info.tag.sid = vio_send_sid(&port->vio);
1540 info.set = 1;
1541
1542 n_addrs = 0;
1543 for (m = vp->mcast_list; m; m = m->next) {
1544 if (m->sent)
1545 continue;
1546 m->sent = 1;
1547 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1548 m->addr, ETH_ALEN);
1549 if (++n_addrs == VNET_NUM_MCAST) {
1550 info.count = n_addrs;
1551
1552 (void) vio_ldc_send(&port->vio, &info,
1553 sizeof(info));
1554 n_addrs = 0;
1555 }
1556 }
1557 if (n_addrs) {
1558 info.count = n_addrs;
1559 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1560 }
1561
1562 info.set = 0;
1563
1564 n_addrs = 0;
1565 pp = &vp->mcast_list;
1566 while ((m = *pp) != NULL) {
1567 if (m->hit) {
1568 m->hit = 0;
1569 pp = &m->next;
1570 continue;
1571 }
1572
1573 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1574 m->addr, ETH_ALEN);
1575 if (++n_addrs == VNET_NUM_MCAST) {
1576 info.count = n_addrs;
1577 (void) vio_ldc_send(&port->vio, &info,
1578 sizeof(info));
1579 n_addrs = 0;
1580 }
1581
1582 *pp = m->next;
1583 kfree(m);
1584 }
1585 if (n_addrs) {
1586 info.count = n_addrs;
1587 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1588 }
1589}
1590
1591void sunvnet_set_rx_mode_common(struct net_device *dev)
1592{
1593 struct vnet *vp = netdev_priv(dev);
1594 struct vnet_port *port;
1595
1596 rcu_read_lock();
1597 list_for_each_entry_rcu(port, &vp->port_list, list) {
1598
1599 if (port->switch_port) {
1600 __update_mc_list(vp, dev);
1601 __send_mc_list(vp, port);
1602 break;
1603 }
1604 }
1605 rcu_read_unlock();
1606}
1607EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1608
1609int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu)
1610{
1611 if (new_mtu < 68 || new_mtu > 65535)
1612 return -EINVAL;
1613
1614 dev->mtu = new_mtu;
1615 return 0;
1616}
1617EXPORT_SYMBOL_GPL(sunvnet_change_mtu_common);
1618
1619int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1620{
1621 return -EINVAL;
1622}
1623EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1624
1625void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1626{
1627 struct vio_dring_state *dr;
1628 int i;
1629
1630 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1631
1632 if (dr->base == NULL)
1633 return;
1634
1635 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1636 struct vio_net_desc *d;
1637 void *skb = port->tx_bufs[i].skb;
1638
1639 if (!skb)
1640 continue;
1641
1642 d = vio_dring_entry(dr, i);
1643
1644 ldc_unmap(port->vio.lp,
1645 port->tx_bufs[i].cookies,
1646 port->tx_bufs[i].ncookies);
1647 dev_kfree_skb(skb);
1648 port->tx_bufs[i].skb = NULL;
1649 d->hdr.state = VIO_DESC_FREE;
1650 }
1651 ldc_free_exp_dring(port->vio.lp, dr->base,
1652 (dr->entry_size * dr->num_entries),
1653 dr->cookies, dr->ncookies);
1654 dr->base = NULL;
1655 dr->entry_size = 0;
1656 dr->num_entries = 0;
1657 dr->pending = 0;
1658 dr->ncookies = 0;
1659}
1660EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1661
1662static void vnet_port_reset(struct vnet_port *port)
1663{
1664 del_timer(&port->clean_timer);
1665 sunvnet_port_free_tx_bufs_common(port);
1666 port->rmtu = 0;
1667 port->tso = true;
1668 port->tsolen = 0;
1669}
1670
1671static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1672{
1673 struct vio_dring_state *dr;
1674 unsigned long len, elen;
1675 int i, err, ncookies;
1676 void *dring;
1677
1678 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1679
1680 elen = sizeof(struct vio_net_desc) +
1681 sizeof(struct ldc_trans_cookie) * 2;
1682 if (vio_version_after_eq(&port->vio, 1, 7))
1683 elen += sizeof(struct vio_net_dext);
1684 len = VNET_TX_RING_SIZE * elen;
1685
1686 ncookies = VIO_MAX_RING_COOKIES;
1687 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1688 dr->cookies, &ncookies,
1689 (LDC_MAP_SHADOW |
1690 LDC_MAP_DIRECT |
1691 LDC_MAP_RW));
1692 if (IS_ERR(dring)) {
1693 err = PTR_ERR(dring);
1694 goto err_out;
1695 }
1696
1697 dr->base = dring;
1698 dr->entry_size = elen;
1699 dr->num_entries = VNET_TX_RING_SIZE;
1700 dr->prod = dr->cons = 0;
1701 port->start_cons = true; /* need an initial trigger */
1702 dr->pending = VNET_TX_RING_SIZE;
1703 dr->ncookies = ncookies;
1704
1705 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1706 struct vio_net_desc *d;
1707
1708 d = vio_dring_entry(dr, i);
1709 d->hdr.state = VIO_DESC_FREE;
1710 }
1711 return 0;
1712
1713err_out:
1714 sunvnet_port_free_tx_bufs_common(port);
1715
1716 return err;
1717}
1718
1719#ifdef CONFIG_NET_POLL_CONTROLLER
1720void sunvnet_poll_controller_common(struct net_device *dev)
1721{
1722 struct vnet *vp = netdev_priv(dev);
1723 struct vnet_port *port;
1724 unsigned long flags;
1725
1726 spin_lock_irqsave(&vp->lock, flags);
1727 if (!list_empty(&vp->port_list)) {
1728 port = list_entry(vp->port_list.next, struct vnet_port, list);
1729 napi_schedule(&port->napi);
1730 }
1731 spin_unlock_irqrestore(&vp->lock, flags);
1732}
1733EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1734#endif
1735
1736void sunvnet_port_add_txq_common(struct vnet_port *port)
1737{
1738 struct vnet *vp = port->vp;
1739 int n;
1740
1741 n = vp->nports++;
1742 n = n & (VNET_MAX_TXQS - 1);
1743 port->q_index = n;
1744 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1745}
1746EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1747
1748void sunvnet_port_rm_txq_common(struct vnet_port *port)
1749{
1750 port->vp->nports--;
1751 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1752}
1753EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);
diff --git a/drivers/net/ethernet/sun/sunvnet.h b/drivers/net/ethernet/sun/sunvnet_common.h
index 01ca78191683..c29c5269703d 100644
--- a/drivers/net/ethernet/sun/sunvnet.h
+++ b/drivers/net/ethernet/sun/sunvnet_common.h
@@ -1,20 +1,12 @@
1#ifndef _SUNVNET_H 1#ifndef _SUNVNETCOMMON_H
2#define _SUNVNET_H 2#define _SUNVNETCOMMON_H
3 3
4#include <linux/interrupt.h> 4#include <linux/interrupt.h>
5 5
6#define DESC_NCOOKIES(entry_size) \
7 ((entry_size) - sizeof(struct vio_net_desc))
8
9/* length of time before we decide the hardware is borked,
10 * and dev->tx_timeout() should be called to fix the problem
11 */
12#define VNET_TX_TIMEOUT (5 * HZ)
13
14/* length of time (or less) we expect pending descriptors to be marked 6/* length of time (or less) we expect pending descriptors to be marked
15 * as VIO_DESC_DONE and skbs ready to be freed 7 * as VIO_DESC_DONE and skbs ready to be freed
16 */ 8 */
17#define VNET_CLEAN_TIMEOUT ((HZ/100)+1) 9#define VNET_CLEAN_TIMEOUT ((HZ / 100) + 1)
18 10
19#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN) 11#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN)
20#define VNET_TX_RING_SIZE 512 12#define VNET_TX_RING_SIZE 512
@@ -29,7 +21,9 @@
29 */ 21 */
30#define VNET_PACKET_SKIP 6 22#define VNET_PACKET_SKIP 6
31 23
32#define VNET_MAXCOOKIES (VNET_MAXPACKET/PAGE_SIZE + 1) 24#define VNET_MAXCOOKIES (VNET_MAXPACKET / PAGE_SIZE + 1)
25
26#define VNET_MAX_TXQS 16
33 27
34struct vnet_tx_entry { 28struct vnet_tx_entry {
35 struct sk_buff *skb; 29 struct sk_buff *skb;
@@ -111,4 +105,29 @@ struct vnet {
111 int nports; 105 int nports;
112}; 106};
113 107
114#endif /* _SUNVNET_H */ 108/* Common funcs */
109void sunvnet_clean_timer_expire_common(unsigned long port0);
110int sunvnet_open_common(struct net_device *dev);
111int sunvnet_close_common(struct net_device *dev);
112void sunvnet_set_rx_mode_common(struct net_device *dev);
113int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
114void sunvnet_tx_timeout_common(struct net_device *dev);
115int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu);
116int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev);
117u16 sunvnet_select_queue_common(struct net_device *dev,
118 struct sk_buff *skb,
119 void *accel_priv,
120 select_queue_fallback_t fallback);
121#ifdef CONFIG_NET_POLL_CONTROLLER
122void sunvnet_poll_controller_common(struct net_device *dev);
123#endif
124void sunvnet_event_common(void *arg, int event);
125int sunvnet_send_attr_common(struct vio_driver_state *vio);
126int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
127void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
128int sunvnet_poll_common(struct napi_struct *napi, int budget);
129void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
130void sunvnet_port_add_txq_common(struct vnet_port *port);
131void sunvnet_port_rm_txq_common(struct vnet_port *port);
132
133#endif /* _SUNVNETCOMMON_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-21 21:28:03 -0500