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Add support for the latest 1G/10G Chelsio adapter, T3.
[deliverable/linux.git] / drivers / net / cxgb3 / cxgb3_offload.c
CommitLineData
4d22de3e
DLR		 1/*
2 * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
3 * Copyright (c) 2006 Open Grid Computing, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/list.h>
35#include <net/neighbour.h>
36#include <linux/notifier.h>
37#include <asm/atomic.h>
38#include <linux/proc_fs.h>
39#include <linux/if_vlan.h>
40#include <net/netevent.h>
41#include <linux/highmem.h>
42#include <linux/vmalloc.h>
43
44#include "common.h"
45#include "regs.h"
46#include "cxgb3_ioctl.h"
47#include "cxgb3_ctl_defs.h"
48#include "cxgb3_defs.h"
49#include "l2t.h"
50#include "firmware_exports.h"
51#include "cxgb3_offload.h"
52
53static LIST_HEAD(client_list);
54static LIST_HEAD(ofld_dev_list);
55static DEFINE_MUTEX(cxgb3_db_lock);
56
57static DEFINE_RWLOCK(adapter_list_lock);
58static LIST_HEAD(adapter_list);
59
60static const unsigned int MAX_ATIDS = 64 * 1024;
61static const unsigned int ATID_BASE = 0x100000;
62
63static inline int offload_activated(struct t3cdev *tdev)
64{
65 const struct adapter *adapter = tdev2adap(tdev);
66
67 return (test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map));
68}
69
70/**
71 * cxgb3_register_client - register an offload client
72 * @client: the client
73 *
74 * Add the client to the client list,
75 * and call backs the client for each activated offload device
76 */
77void cxgb3_register_client(struct cxgb3_client *client)
78{
79 struct t3cdev *tdev;
80
81 mutex_lock(&cxgb3_db_lock);
82 list_add_tail(&client->client_list, &client_list);
83
84 if (client->add) {
85 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
86 if (offload_activated(tdev))
87 client->add(tdev);
88 }
89 }
90 mutex_unlock(&cxgb3_db_lock);
91}
92
93EXPORT_SYMBOL(cxgb3_register_client);
94
95/**
96 * cxgb3_unregister_client - unregister an offload client
97 * @client: the client
98 *
99 * Remove the client to the client list,
100 * and call backs the client for each activated offload device.
101 */
102void cxgb3_unregister_client(struct cxgb3_client *client)
103{
104 struct t3cdev *tdev;
105
106 mutex_lock(&cxgb3_db_lock);
107 list_del(&client->client_list);
108
109 if (client->remove) {
110 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
111 if (offload_activated(tdev))
112 client->remove(tdev);
113 }
114 }
115 mutex_unlock(&cxgb3_db_lock);
116}
117
118EXPORT_SYMBOL(cxgb3_unregister_client);
119
120/**
121 * cxgb3_add_clients - activate registered clients for an offload device
122 * @tdev: the offload device
123 *
124 * Call backs all registered clients once a offload device is activated
125 */
126void cxgb3_add_clients(struct t3cdev *tdev)
127{
128 struct cxgb3_client *client;
129
130 mutex_lock(&cxgb3_db_lock);
131 list_for_each_entry(client, &client_list, client_list) {
132 if (client->add)
133 client->add(tdev);
134 }
135 mutex_unlock(&cxgb3_db_lock);
136}
137
138/**
139 * cxgb3_remove_clients - deactivates registered clients
140 * for an offload device
141 * @tdev: the offload device
142 *
143 * Call backs all registered clients once a offload device is deactivated
144 */
145void cxgb3_remove_clients(struct t3cdev *tdev)
146{
147 struct cxgb3_client *client;
148
149 mutex_lock(&cxgb3_db_lock);
150 list_for_each_entry(client, &client_list, client_list) {
151 if (client->remove)
152 client->remove(tdev);
153 }
154 mutex_unlock(&cxgb3_db_lock);
155}
156
157static struct net_device *get_iff_from_mac(struct adapter *adapter,
158 const unsigned char *mac,
159 unsigned int vlan)
160{
161 int i;
162
163 for_each_port(adapter, i) {
164 const struct vlan_group *grp;
165 struct net_device *dev = adapter->port[i];
166 const struct port_info *p = netdev_priv(dev);
167
168 if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
169 if (vlan && vlan != VLAN_VID_MASK) {
170 grp = p->vlan_grp;
171 dev = grp ? grp->vlan_devices[vlan] : NULL;
172 } else
173 while (dev->master)
174 dev = dev->master;
175 return dev;
176 }
177 }
178 return NULL;
179}
180
181static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
182 void *data)
183{
184 int ret = 0;
185 struct ulp_iscsi_info *uiip = data;
186
187 switch (req) {
188 case ULP_ISCSI_GET_PARAMS:
189 uiip->pdev = adapter->pdev;
190 uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
191 uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
192 uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
193 /*
194 * On tx, the iscsi pdu has to be <= tx page size and has to
195 * fit into the Tx PM FIFO.
196 */
197 uiip->max_txsz = min(adapter->params.tp.tx_pg_size,
198 t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
199 /* on rx, the iscsi pdu has to be < rx page size and the
200 whole pdu + cpl headers has to fit into one sge buffer */
201 uiip->max_rxsz = min_t(unsigned int,
202 adapter->params.tp.rx_pg_size,
203 (adapter->sge.qs[0].fl[1].buf_size -
204 sizeof(struct cpl_rx_data) * 2 -
205 sizeof(struct cpl_rx_data_ddp)));
206 break;
207 case ULP_ISCSI_SET_PARAMS:
208 t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
209 break;
210 default:
211 ret = -EOPNOTSUPP;
212 }
213 return ret;
214}
215
216/* Response queue used for RDMA events. */
217#define ASYNC_NOTIF_RSPQ 0
218
219static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
220{
221 int ret = 0;
222
223 switch (req) {
224 case RDMA_GET_PARAMS:{
225 struct rdma_info *req = data;
226 struct pci_dev *pdev = adapter->pdev;
227
228 req->udbell_physbase = pci_resource_start(pdev, 2);
229 req->udbell_len = pci_resource_len(pdev, 2);
230 req->tpt_base =
231 t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
232 req->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
233 req->pbl_base =
234 t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
235 req->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
236 req->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
237 req->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
238 req->kdb_addr = adapter->regs + A_SG_KDOORBELL;
239 req->pdev = pdev;
240 break;
241 }
242 case RDMA_CQ_OP:{
243 unsigned long flags;
244 struct rdma_cq_op *req = data;
245
246 /* may be called in any context */
247 spin_lock_irqsave(&adapter->sge.reg_lock, flags);
248 ret = t3_sge_cqcntxt_op(adapter, req->id, req->op,
249 req->credits);
250 spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
251 break;
252 }
253 case RDMA_GET_MEM:{
254 struct ch_mem_range *t = data;
255 struct mc7 *mem;
256
257 if ((t->addr & 7) || (t->len & 7))
258 return -EINVAL;
259 if (t->mem_id == MEM_CM)
260 mem = &adapter->cm;
261 else if (t->mem_id == MEM_PMRX)
262 mem = &adapter->pmrx;
263 else if (t->mem_id == MEM_PMTX)
264 mem = &adapter->pmtx;
265 else
266 return -EINVAL;
267
268 ret =
269 t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
270 (u64 *) t->buf);
271 if (ret)
272 return ret;
273 break;
274 }
275 case RDMA_CQ_SETUP:{
276 struct rdma_cq_setup *req = data;
277
278 spin_lock_irq(&adapter->sge.reg_lock);
279 ret =
280 t3_sge_init_cqcntxt(adapter, req->id,
281 req->base_addr, req->size,
282 ASYNC_NOTIF_RSPQ,
283 req->ovfl_mode, req->credits,
284 req->credit_thres);
285 spin_unlock_irq(&adapter->sge.reg_lock);
286 break;
287 }
288 case RDMA_CQ_DISABLE:
289 spin_lock_irq(&adapter->sge.reg_lock);
290 ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
291 spin_unlock_irq(&adapter->sge.reg_lock);
292 break;
293 case RDMA_CTRL_QP_SETUP:{
294 struct rdma_ctrlqp_setup *req = data;
295
296 spin_lock_irq(&adapter->sge.reg_lock);
297 ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
298 SGE_CNTXT_RDMA,
299 ASYNC_NOTIF_RSPQ,
300 req->base_addr, req->size,
301 FW_RI_TID_START, 1, 0);
302 spin_unlock_irq(&adapter->sge.reg_lock);
303 break;
304 }
305 default:
306 ret = -EOPNOTSUPP;
307 }
308 return ret;
309}
310
311static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
312{
313 struct adapter *adapter = tdev2adap(tdev);
314 struct tid_range *tid;
315 struct mtutab *mtup;
316 struct iff_mac *iffmacp;
317 struct ddp_params *ddpp;
318 struct adap_ports *ports;
319 int i;
320
321 switch (req) {
322 case GET_MAX_OUTSTANDING_WR:
323 *(unsigned int *)data = FW_WR_NUM;
324 break;
325 case GET_WR_LEN:
326 *(unsigned int *)data = WR_FLITS;
327 break;
328 case GET_TX_MAX_CHUNK:
329 *(unsigned int *)data = 1 << 20; /* 1MB */
330 break;
331 case GET_TID_RANGE:
332 tid = data;
333 tid->num = t3_mc5_size(&adapter->mc5) -
334 adapter->params.mc5.nroutes -
335 adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
336 tid->base = 0;
337 break;
338 case GET_STID_RANGE:
339 tid = data;
340 tid->num = adapter->params.mc5.nservers;
341 tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
342 adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
343 break;
344 case GET_L2T_CAPACITY:
345 *(unsigned int *)data = 2048;
346 break;
347 case GET_MTUS:
348 mtup = data;
349 mtup->size = NMTUS;
350 mtup->mtus = adapter->params.mtus;
351 break;
352 case GET_IFF_FROM_MAC:
353 iffmacp = data;
354 iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
355 iffmacp->vlan_tag &
356 VLAN_VID_MASK);
357 break;
358 case GET_DDP_PARAMS:
359 ddpp = data;
360 ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
361 ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
362 ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
363 break;
364 case GET_PORTS:
365 ports = data;
366 ports->nports = adapter->params.nports;
367 for_each_port(adapter, i)
368 ports->lldevs[i] = adapter->port[i];
369 break;
370 case ULP_ISCSI_GET_PARAMS:
371 case ULP_ISCSI_SET_PARAMS:
372 if (!offload_running(adapter))
373 return -EAGAIN;
374 return cxgb_ulp_iscsi_ctl(adapter, req, data);
375 case RDMA_GET_PARAMS:
376 case RDMA_CQ_OP:
377 case RDMA_CQ_SETUP:
378 case RDMA_CQ_DISABLE:
379 case RDMA_CTRL_QP_SETUP:
380 case RDMA_GET_MEM:
381 if (!offload_running(adapter))
382 return -EAGAIN;
383 return cxgb_rdma_ctl(adapter, req, data);
384 default:
385 return -EOPNOTSUPP;
386 }
387 return 0;
388}
389
390/*
391 * Dummy handler for Rx offload packets in case we get an offload packet before
392 * proper processing is setup. This complains and drops the packet as it isn't
393 * normal to get offload packets at this stage.
394 */
395static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
396 int n)
397{
398 CH_ERR(tdev2adap(dev), "%d unexpected offload packets, first data %u\n",
399 n, ntohl(*(u32 *)skbs[0]->data));
400 while (n--)
401 dev_kfree_skb_any(skbs[n]);
402 return 0;
403}
404
405static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
406{
407}
408
409void cxgb3_set_dummy_ops(struct t3cdev *dev)
410{
411 dev->recv = rx_offload_blackhole;
412 dev->neigh_update = dummy_neigh_update;
413}
414
415/*
416 * Free an active-open TID.
417 */
418void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
419{
420 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
421 union active_open_entry *p = atid2entry(t, atid);
422 void *ctx = p->t3c_tid.ctx;
423
424 spin_lock_bh(&t->atid_lock);
425 p->next = t->afree;
426 t->afree = p;
427 t->atids_in_use--;
428 spin_unlock_bh(&t->atid_lock);
429
430 return ctx;
431}
432
433EXPORT_SYMBOL(cxgb3_free_atid);
434
435/*
436 * Free a server TID and return it to the free pool.
437 */
438void cxgb3_free_stid(struct t3cdev *tdev, int stid)
439{
440 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
441 union listen_entry *p = stid2entry(t, stid);
442
443 spin_lock_bh(&t->stid_lock);
444 p->next = t->sfree;
445 t->sfree = p;
446 t->stids_in_use--;
447 spin_unlock_bh(&t->stid_lock);
448}
449
450EXPORT_SYMBOL(cxgb3_free_stid);
451
452void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
453 void *ctx, unsigned int tid)
454{
455 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
456
457 t->tid_tab[tid].client = client;
458 t->tid_tab[tid].ctx = ctx;
459 atomic_inc(&t->tids_in_use);
460}
461
462EXPORT_SYMBOL(cxgb3_insert_tid);
463
464/*
465 * Populate a TID_RELEASE WR. The skb must be already propely sized.
466 */
467static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
468{
469 struct cpl_tid_release *req;
470
471 skb->priority = CPL_PRIORITY_SETUP;
472 req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
473 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
474 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
475}
476
477static void t3_process_tid_release_list(struct work_struct *work)
478{
479 struct t3c_data *td = container_of(work, struct t3c_data,
480 tid_release_task);
481 struct sk_buff *skb;
482 struct t3cdev *tdev = td->dev;
483
484
485 spin_lock_bh(&td->tid_release_lock);
486 while (td->tid_release_list) {
487 struct t3c_tid_entry *p = td->tid_release_list;
488
489 td->tid_release_list = (struct t3c_tid_entry *)p->ctx;
490 spin_unlock_bh(&td->tid_release_lock);
491
492 skb = alloc_skb(sizeof(struct cpl_tid_release),
493 GFP_KERNEL | __GFP_NOFAIL);
494 mk_tid_release(skb, p - td->tid_maps.tid_tab);
495 cxgb3_ofld_send(tdev, skb);
496 p->ctx = NULL;
497 spin_lock_bh(&td->tid_release_lock);
498 }
499 spin_unlock_bh(&td->tid_release_lock);
500}
501
502/* use ctx as a next pointer in the tid release list */
503void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
504{
505 struct t3c_data *td = T3C_DATA(tdev);
506 struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
507
508 spin_lock_bh(&td->tid_release_lock);
509 p->ctx = (void *)td->tid_release_list;
510 td->tid_release_list = p;
511 if (!p->ctx)
512 schedule_work(&td->tid_release_task);
513 spin_unlock_bh(&td->tid_release_lock);
514}
515
516EXPORT_SYMBOL(cxgb3_queue_tid_release);
517
518/*
519 * Remove a tid from the TID table. A client may defer processing its last
520 * CPL message if it is locked at the time it arrives, and while the message
521 * sits in the client's backlog the TID may be reused for another connection.
522 * To handle this we atomically switch the TID association if it still points
523 * to the original client context.
524 */
525void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
526{
527 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
528
529 BUG_ON(tid >= t->ntids);
530 if (tdev->type == T3A)
531 (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
532 else {
533 struct sk_buff *skb;
534
535 skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
536 if (likely(skb)) {
537 mk_tid_release(skb, tid);
538 cxgb3_ofld_send(tdev, skb);
539 t->tid_tab[tid].ctx = NULL;
540 } else
541 cxgb3_queue_tid_release(tdev, tid);
542 }
543 atomic_dec(&t->tids_in_use);
544}
545
546EXPORT_SYMBOL(cxgb3_remove_tid);
547
548int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
549 void *ctx)
550{
551 int atid = -1;
552 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
553
554 spin_lock_bh(&t->atid_lock);
555 if (t->afree) {
556 union active_open_entry *p = t->afree;
557
558 atid = (p - t->atid_tab) + t->atid_base;
559 t->afree = p->next;
560 p->t3c_tid.ctx = ctx;
561 p->t3c_tid.client = client;
562 t->atids_in_use++;
563 }
564 spin_unlock_bh(&t->atid_lock);
565 return atid;
566}
567
568EXPORT_SYMBOL(cxgb3_alloc_atid);
569
570int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
571 void *ctx)
572{
573 int stid = -1;
574 struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
575
576 spin_lock_bh(&t->stid_lock);
577 if (t->sfree) {
578 union listen_entry *p = t->sfree;
579
580 stid = (p - t->stid_tab) + t->stid_base;
581 t->sfree = p->next;
582 p->t3c_tid.ctx = ctx;
583 p->t3c_tid.client = client;
584 t->stids_in_use++;
585 }
586 spin_unlock_bh(&t->stid_lock);
587 return stid;
588}
589
590EXPORT_SYMBOL(cxgb3_alloc_stid);
591
592static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
593{
594 struct cpl_smt_write_rpl *rpl = cplhdr(skb);
595
596 if (rpl->status != CPL_ERR_NONE)
597 printk(KERN_ERR
598 "Unexpected SMT_WRITE_RPL status %u for entry %u\n",
599 rpl->status, GET_TID(rpl));
600
601 return CPL_RET_BUF_DONE;
602}
603
604static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
605{
606 struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
607
608 if (rpl->status != CPL_ERR_NONE)
609 printk(KERN_ERR
610 "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
611 rpl->status, GET_TID(rpl));
612
613 return CPL_RET_BUF_DONE;
614}
615
616static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
617{
618 struct cpl_act_open_rpl *rpl = cplhdr(skb);
619 unsigned int atid = G_TID(ntohl(rpl->atid));
620 struct t3c_tid_entry *t3c_tid;
621
622 t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
623 if (t3c_tid->ctx && t3c_tid->client && t3c_tid->client->handlers &&
624 t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
625 return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
626 t3c_tid->
627 ctx);
628 } else {
629 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
630 dev->name, CPL_ACT_OPEN_RPL);
631 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
632 }
633}
634
635static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
636{
637 union opcode_tid *p = cplhdr(skb);
638 unsigned int stid = G_TID(ntohl(p->opcode_tid));
639 struct t3c_tid_entry *t3c_tid;
640
641 t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
642 if (t3c_tid->ctx && t3c_tid->client->handlers &&
643 t3c_tid->client->handlers[p->opcode]) {
644 return t3c_tid->client->handlers[p->opcode] (dev, skb,
645 t3c_tid->ctx);
646 } else {
647 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
648 dev->name, p->opcode);
649 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
650 }
651}
652
653static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
654{
655 union opcode_tid *p = cplhdr(skb);
656 unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
657 struct t3c_tid_entry *t3c_tid;
658
659 t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
660 if (t3c_tid->ctx && t3c_tid->client->handlers &&
661 t3c_tid->client->handlers[p->opcode]) {
662 return t3c_tid->client->handlers[p->opcode]
663 (dev, skb, t3c_tid->ctx);
664 } else {
665 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
666 dev->name, p->opcode);
667 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
668 }
669}
670
671static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
672{
673 struct cpl_pass_accept_req *req = cplhdr(skb);
674 unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
675 struct t3c_tid_entry *t3c_tid;
676
677 t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
678 if (t3c_tid->ctx && t3c_tid->client->handlers &&
679 t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
680 return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
681 (dev, skb, t3c_tid->ctx);
682 } else {
683 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
684 dev->name, CPL_PASS_ACCEPT_REQ);
685 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
686 }
687}
688
689static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
690{
691 union opcode_tid *p = cplhdr(skb);
692 unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
693 struct t3c_tid_entry *t3c_tid;
694
695 t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
696 if (t3c_tid->ctx && t3c_tid->client->handlers &&
697 t3c_tid->client->handlers[p->opcode]) {
698 return t3c_tid->client->handlers[p->opcode]
699 (dev, skb, t3c_tid->ctx);
700 } else {
701 struct cpl_abort_req_rss *req = cplhdr(skb);
702 struct cpl_abort_rpl *rpl;
703
704 struct sk_buff *skb =
705 alloc_skb(sizeof(struct cpl_abort_rpl), GFP_ATOMIC);
706 if (!skb) {
707 printk("do_abort_req_rss: couldn't get skb!\n");
708 goto out;
709 }
710 skb->priority = CPL_PRIORITY_DATA;
711 __skb_put(skb, sizeof(struct cpl_abort_rpl));
712 rpl = cplhdr(skb);
713 rpl->wr.wr_hi =
714 htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
715 rpl->wr.wr_lo = htonl(V_WR_TID(GET_TID(req)));
716 OPCODE_TID(rpl) =
717 htonl(MK_OPCODE_TID(CPL_ABORT_RPL, GET_TID(req)));
718 rpl->cmd = req->status;
719 cxgb3_ofld_send(dev, skb);
720out:
721 return CPL_RET_BUF_DONE;
722 }
723}
724
725static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
726{
727 struct cpl_act_establish *req = cplhdr(skb);
728 unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
729 struct t3c_tid_entry *t3c_tid;
730
731 t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
732 if (t3c_tid->ctx && t3c_tid->client->handlers &&
733 t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
734 return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
735 (dev, skb, t3c_tid->ctx);
736 } else {
737 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
738 dev->name, CPL_PASS_ACCEPT_REQ);
739 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
740 }
741}
742
743static int do_set_tcb_rpl(struct t3cdev *dev, struct sk_buff *skb)
744{
745 struct cpl_set_tcb_rpl *rpl = cplhdr(skb);
746
747 if (rpl->status != CPL_ERR_NONE)
748 printk(KERN_ERR
749 "Unexpected SET_TCB_RPL status %u for tid %u\n",
750 rpl->status, GET_TID(rpl));
751 return CPL_RET_BUF_DONE;
752}
753
754static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
755{
756 struct cpl_trace_pkt *p = cplhdr(skb);
757
758 skb->protocol = 0xffff;
759 skb->dev = dev->lldev;
760 skb_pull(skb, sizeof(*p));
761 skb->mac.raw = skb->data;
762 netif_receive_skb(skb);
763 return 0;
764}
765
766static int do_term(struct t3cdev *dev, struct sk_buff *skb)
767{
768 unsigned int hwtid = ntohl(skb->priority) >> 8 & 0xfffff;
769 unsigned int opcode = G_OPCODE(ntohl(skb->csum));
770 struct t3c_tid_entry *t3c_tid;
771
772 t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
773 if (t3c_tid->ctx && t3c_tid->client->handlers &&
774 t3c_tid->client->handlers[opcode]) {
775 return t3c_tid->client->handlers[opcode] (dev, skb,
776 t3c_tid->ctx);
777 } else {
778 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
779 dev->name, opcode);
780 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
781 }
782}
783
784static int nb_callback(struct notifier_block *self, unsigned long event,
785 void *ctx)
786{
787 switch (event) {
788 case (NETEVENT_NEIGH_UPDATE):{
789 cxgb_neigh_update((struct neighbour *)ctx);
790 break;
791 }
792 case (NETEVENT_PMTU_UPDATE):
793 break;
794 case (NETEVENT_REDIRECT):{
795 struct netevent_redirect *nr = ctx;
796 cxgb_redirect(nr->old, nr->new);
797 cxgb_neigh_update(nr->new->neighbour);
798 break;
799 }
800 default:
801 break;
802 }
803 return 0;
804}
805
806static struct notifier_block nb = {
807 .notifier_call = nb_callback
808};
809
810/*
811 * Process a received packet with an unknown/unexpected CPL opcode.
812 */
813static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
814{
815 printk(KERN_ERR "%s: received bad CPL command 0x%x\n", dev->name,
816 *skb->data);
817 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
818}
819
820/*
821 * Handlers for each CPL opcode
822 */
823static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
824
825/*
826 * Add a new handler to the CPL dispatch table. A NULL handler may be supplied
827 * to unregister an existing handler.
828 */
829void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
830{
831 if (opcode < NUM_CPL_CMDS)
832 cpl_handlers[opcode] = h ? h : do_bad_cpl;
833 else
834 printk(KERN_ERR "T3C: handler registration for "
835 "opcode %x failed\n", opcode);
836}
837
838EXPORT_SYMBOL(t3_register_cpl_handler);
839
840/*
841 * T3CDEV's receive method.
842 */
843int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
844{
845 while (n--) {
846 struct sk_buff *skb = *skbs++;
847 unsigned int opcode = G_OPCODE(ntohl(skb->csum));
848 int ret = cpl_handlers[opcode] (dev, skb);
849
850#if VALIDATE_TID
851 if (ret & CPL_RET_UNKNOWN_TID) {
852 union opcode_tid *p = cplhdr(skb);
853
854 printk(KERN_ERR "%s: CPL message (opcode %u) had "
855 "unknown TID %u\n", dev->name, opcode,
856 G_TID(ntohl(p->opcode_tid)));
857 }
858#endif
859 if (ret & CPL_RET_BUF_DONE)
860 kfree_skb(skb);
861 }
862 return 0;
863}
864
865/*
866 * Sends an sk_buff to a T3C driver after dealing with any active network taps.
867 */
868int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
869{
870 int r;
871
872 local_bh_disable();
873 r = dev->send(dev, skb);
874 local_bh_enable();
875 return r;
876}
877
878EXPORT_SYMBOL(cxgb3_ofld_send);
879
880static int is_offloading(struct net_device *dev)
881{
882 struct adapter *adapter;
883 int i;
884
885 read_lock_bh(&adapter_list_lock);
886 list_for_each_entry(adapter, &adapter_list, adapter_list) {
887 for_each_port(adapter, i) {
888 if (dev == adapter->port[i]) {
889 read_unlock_bh(&adapter_list_lock);
890 return 1;
891 }
892 }
893 }
894 read_unlock_bh(&adapter_list_lock);
895 return 0;
896}
897
898void cxgb_neigh_update(struct neighbour *neigh)
899{
900 struct net_device *dev = neigh->dev;
901
902 if (dev && (is_offloading(dev))) {
903 struct t3cdev *tdev = T3CDEV(dev);
904
905 BUG_ON(!tdev);
906 t3_l2t_update(tdev, neigh);
907 }
908}
909
910static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
911{
912 struct sk_buff *skb;
913 struct cpl_set_tcb_field *req;
914
915 skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
916 if (!skb) {
917 printk(KERN_ERR "%s: cannot allocate skb!\n", __FUNCTION__);
918 return;
919 }
920 skb->priority = CPL_PRIORITY_CONTROL;
921 req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
922 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
923 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
924 req->reply = 0;
925 req->cpu_idx = 0;
926 req->word = htons(W_TCB_L2T_IX);
927 req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
928 req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
929 tdev->send(tdev, skb);
930}
931
932void cxgb_redirect(struct dst_entry *old, struct dst_entry *new)
933{
934 struct net_device *olddev, *newdev;
935 struct tid_info *ti;
936 struct t3cdev *tdev;
937 u32 tid;
938 int update_tcb;
939 struct l2t_entry *e;
940 struct t3c_tid_entry *te;
941
942 olddev = old->neighbour->dev;
943 newdev = new->neighbour->dev;
944 if (!is_offloading(olddev))
945 return;
946 if (!is_offloading(newdev)) {
947 printk(KERN_WARNING "%s: Redirect to non-offload"
948 "device ignored.\n", __FUNCTION__);
949 return;
950 }
951 tdev = T3CDEV(olddev);
952 BUG_ON(!tdev);
953 if (tdev != T3CDEV(newdev)) {
954 printk(KERN_WARNING "%s: Redirect to different "
955 "offload device ignored.\n", __FUNCTION__);
956 return;
957 }
958
959 /* Add new L2T entry */
960 e = t3_l2t_get(tdev, new->neighbour, newdev);
961 if (!e) {
962 printk(KERN_ERR "%s: couldn't allocate new l2t entry!\n",
963 __FUNCTION__);
964 return;
965 }
966
967 /* Walk tid table and notify clients of dst change. */
968 ti = &(T3C_DATA(tdev))->tid_maps;
969 for (tid = 0; tid < ti->ntids; tid++) {
970 te = lookup_tid(ti, tid);
971 BUG_ON(!te);
972 if (te->ctx && te->client && te->client->redirect) {
973 update_tcb = te->client->redirect(te->ctx, old, new, e);
974 if (update_tcb) {
975 l2t_hold(L2DATA(tdev), e);
976 set_l2t_ix(tdev, tid, e);
977 }
978 }
979 }
980 l2t_release(L2DATA(tdev), e);
981}
982
983/*
984 * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
985 * The allocated memory is cleared.
986 */
987void *cxgb_alloc_mem(unsigned long size)
988{
989 void *p = kmalloc(size, GFP_KERNEL);
990
991 if (!p)
992 p = vmalloc(size);
993 if (p)
994 memset(p, 0, size);
995 return p;
996}
997
998/*
999 * Free memory allocated through t3_alloc_mem().
1000 */
1001void cxgb_free_mem(void *addr)
1002{
1003 unsigned long p = (unsigned long)addr;
1004
1005 if (p >= VMALLOC_START && p < VMALLOC_END)
1006 vfree(addr);
1007 else
1008 kfree(addr);
1009}
1010
1011/*
1012 * Allocate and initialize the TID tables. Returns 0 on success.
1013 */
1014static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1015 unsigned int natids, unsigned int nstids,
1016 unsigned int atid_base, unsigned int stid_base)
1017{
1018 unsigned long size = ntids * sizeof(*t->tid_tab) +
1019 natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1020
1021 t->tid_tab = cxgb_alloc_mem(size);
1022 if (!t->tid_tab)
1023 return -ENOMEM;
1024
1025 t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1026 t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1027 t->ntids = ntids;
1028 t->nstids = nstids;
1029 t->stid_base = stid_base;
1030 t->sfree = NULL;
1031 t->natids = natids;
1032 t->atid_base = atid_base;
1033 t->afree = NULL;
1034 t->stids_in_use = t->atids_in_use = 0;
1035 atomic_set(&t->tids_in_use, 0);
1036 spin_lock_init(&t->stid_lock);
1037 spin_lock_init(&t->atid_lock);
1038
1039 /*
1040 * Setup the free lists for stid_tab and atid_tab.
1041 */
1042 if (nstids) {
1043 while (--nstids)
1044 t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1045 t->sfree = t->stid_tab;
1046 }
1047 if (natids) {
1048 while (--natids)
1049 t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1050 t->afree = t->atid_tab;
1051 }
1052 return 0;
1053}
1054
1055static void free_tid_maps(struct tid_info *t)
1056{
1057 cxgb_free_mem(t->tid_tab);
1058}
1059
1060static inline void add_adapter(struct adapter *adap)
1061{
1062 write_lock_bh(&adapter_list_lock);
1063 list_add_tail(&adap->adapter_list, &adapter_list);
1064 write_unlock_bh(&adapter_list_lock);
1065}
1066
1067static inline void remove_adapter(struct adapter *adap)
1068{
1069 write_lock_bh(&adapter_list_lock);
1070 list_del(&adap->adapter_list);
1071 write_unlock_bh(&adapter_list_lock);
1072}
1073
1074int cxgb3_offload_activate(struct adapter *adapter)
1075{
1076 struct t3cdev *dev = &adapter->tdev;
1077 int natids, err;
1078 struct t3c_data *t;
1079 struct tid_range stid_range, tid_range;
1080 struct mtutab mtutab;
1081 unsigned int l2t_capacity;
1082
1083 t = kcalloc(1, sizeof(*t), GFP_KERNEL);
1084 if (!t)
1085 return -ENOMEM;
1086
1087 err = -EOPNOTSUPP;
1088 if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1089 dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1090 dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1091 dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1092 dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1093 dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1094 goto out_free;
1095
1096 err = -ENOMEM;
1097 L2DATA(dev) = t3_init_l2t(l2t_capacity);
1098 if (!L2DATA(dev))
1099 goto out_free;
1100
1101 natids = min(tid_range.num / 2, MAX_ATIDS);
1102 err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1103 stid_range.num, ATID_BASE, stid_range.base);
1104 if (err)
1105 goto out_free_l2t;
1106
1107 t->mtus = mtutab.mtus;
1108 t->nmtus = mtutab.size;
1109
1110 INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1111 spin_lock_init(&t->tid_release_lock);
1112 INIT_LIST_HEAD(&t->list_node);
1113 t->dev = dev;
1114
1115 T3C_DATA(dev) = t;
1116 dev->recv = process_rx;
1117 dev->neigh_update = t3_l2t_update;
1118
1119 /* Register netevent handler once */
1120 if (list_empty(&adapter_list))
1121 register_netevent_notifier(&nb);
1122
1123 add_adapter(adapter);
1124 return 0;
1125
1126out_free_l2t:
1127 t3_free_l2t(L2DATA(dev));
1128 L2DATA(dev) = NULL;
1129out_free:
1130 kfree(t);
1131 return err;
1132}
1133
1134void cxgb3_offload_deactivate(struct adapter *adapter)
1135{
1136 struct t3cdev *tdev = &adapter->tdev;
1137 struct t3c_data *t = T3C_DATA(tdev);
1138
1139 remove_adapter(adapter);
1140 if (list_empty(&adapter_list))
1141 unregister_netevent_notifier(&nb);
1142
1143 free_tid_maps(&t->tid_maps);
1144 T3C_DATA(tdev) = NULL;
1145 t3_free_l2t(L2DATA(tdev));
1146 L2DATA(tdev) = NULL;
1147 kfree(t);
1148}
1149
1150static inline void register_tdev(struct t3cdev *tdev)
1151{
1152 static int unit;
1153
1154 mutex_lock(&cxgb3_db_lock);
1155 snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1156 list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1157 mutex_unlock(&cxgb3_db_lock);
1158}
1159
1160static inline void unregister_tdev(struct t3cdev *tdev)
1161{
1162 mutex_lock(&cxgb3_db_lock);
1163 list_del(&tdev->ofld_dev_list);
1164 mutex_unlock(&cxgb3_db_lock);
1165}
1166
1167void __devinit cxgb3_adapter_ofld(struct adapter *adapter)
1168{
1169 struct t3cdev *tdev = &adapter->tdev;
1170
1171 INIT_LIST_HEAD(&tdev->ofld_dev_list);
1172
1173 cxgb3_set_dummy_ops(tdev);
1174 tdev->send = t3_offload_tx;
1175 tdev->ctl = cxgb_offload_ctl;
1176 tdev->type = adapter->params.rev == 0 ? T3A : T3B;
1177
1178 register_tdev(tdev);
1179}
1180
1181void __devexit cxgb3_adapter_unofld(struct adapter *adapter)
1182{
1183 struct t3cdev *tdev = &adapter->tdev;
1184
1185 tdev->recv = NULL;
1186 tdev->neigh_update = NULL;
1187
1188 unregister_tdev(tdev);
1189}
1190
1191void __init cxgb3_offload_init(void)
1192{
1193 int i;
1194
1195 for (i = 0; i < NUM_CPL_CMDS; ++i)
1196 cpl_handlers[i] = do_bad_cpl;
1197
1198 t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1199 t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1200 t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1201 t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1202 t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1203 t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1204 t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1205 t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1206 t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1207 t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1208 t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1209 t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1210 t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1211 t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1212 t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1213 t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1214 t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1215 t3_register_cpl_handler(CPL_SET_TCB_RPL, do_set_tcb_rpl);
1216 t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1217 t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1218 t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1219 t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1220 t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1221 t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1222}
Linux kernel - Deliverables
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