drivers/staging/rdma/hfi1/diag.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 /*
  49  * This file contains support for diagnostic functions.  It is accessed by
  50  * opening the hfi1_diag device, normally minor number 129.  Diagnostic use
  51  * of the chip may render the chip or board unusable until the driver
  52  * is unloaded, or in some cases, until the system is rebooted.
  53  *
  54  * Accesses to the chip through this interface are not similar to going
  55  * through the /sys/bus/pci resource mmap interface.
  56  */
  57
  58 #include <linux/io.h>
  59 #include <linux/pci.h>
  60 #include <linux/poll.h>
  61 #include <linux/vmalloc.h>
  62 #include <linux/export.h>
  63 #include <linux/fs.h>
  64 #include <linux/uaccess.h>
  65 #include <linux/module.h>
  66 #include <rdma/ib_smi.h>
  67 #include "hfi.h"
  68 #include "device.h"
  69 #include "common.h"
  70 #include "verbs_txreq.h"
  71 #include "trace.h"
  72
  73 #undef pr_fmt
  74 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  75 #define snoop_dbg(fmt, ...) \
  76         hfi1_cdbg(SNOOP, fmt, ##__VA_ARGS__)
  77
  78 /* Snoop option mask */
  79 #define SNOOP_DROP_SEND         BIT(0)
  80 #define SNOOP_USE_METADATA      BIT(1)
  81 #define SNOOP_SET_VL0TOVL15     BIT(2)
  82
  83 static u8 snoop_flags;
  84
  85 /*
  86  * Extract packet length from LRH header.
  87  * This is in Dwords so multiply by 4 to get size in bytes
  88  */
  89 #define HFI1_GET_PKT_LEN(x)      (((be16_to_cpu((x)->lrh[2]) & 0xFFF)) << 2)
  90
  91 enum hfi1_filter_status {
  92         HFI1_FILTER_HIT,
  93         HFI1_FILTER_ERR,
  94         HFI1_FILTER_MISS
  95 };
  96
  97 /* snoop processing functions */
  98 rhf_rcv_function_ptr snoop_rhf_rcv_functions[8] = {
  99         [RHF_RCV_TYPE_EXPECTED] = snoop_recv_handler,
 100         [RHF_RCV_TYPE_EAGER]    = snoop_recv_handler,
 101         [RHF_RCV_TYPE_IB]       = snoop_recv_handler,
 102         [RHF_RCV_TYPE_ERROR]    = snoop_recv_handler,
 103         [RHF_RCV_TYPE_BYPASS]   = snoop_recv_handler,
 104         [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
 105         [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
 106         [RHF_RCV_TYPE_INVALID7] = process_receive_invalid
 107 };
 108
 109 /* Snoop packet structure */
 110 struct snoop_packet {
 111         struct list_head list;
 112         u32 total_len;
 113         u8 data[];
 114 };
 115
 116 /* Do not make these an enum or it will blow up the capture_md */
 117 #define PKT_DIR_EGRESS 0x0
 118 #define PKT_DIR_INGRESS 0x1
 119
 120 /* Packet capture metadata returned to the user with the packet. */
 121 struct capture_md {
 122         u8 port;
 123         u8 dir;
 124         u8 reserved[6];
 125         union {
 126                 u64 pbc;
 127                 u64 rhf;
 128         } u;
 129 };
 130
 131 static atomic_t diagpkt_count = ATOMIC_INIT(0);
 132 static struct cdev diagpkt_cdev;
 133 static struct device *diagpkt_device;
 134
 135 static ssize_t diagpkt_write(struct file *fp, const char __user *data,
 136                              size_t count, loff_t *off);
 137
 138 static const struct file_operations diagpkt_file_ops = {
 139         .owner = THIS_MODULE,
 140         .write = diagpkt_write,
 141         .llseek = noop_llseek,
 142 };
 143
 144 /*
 145  * This is used for communication with user space for snoop extended IOCTLs
 146  */
 147 struct hfi1_link_info {
 148         __be64 node_guid;
 149         u8 port_mode;
 150         u8 port_state;
 151         u16 link_speed_active;
 152         u16 link_width_active;
 153         u16 vl15_init;
 154         u8 port_number;
 155         /*
 156          * Add padding to make this a full IB SMP payload. Note: changing the
 157          * size of this structure will make the IOCTLs created with _IOWR
 158          * change.
 159          * Be sure to run tests on all IOCTLs when making changes to this
 160          * structure.
 161          */
 162         u8 res[47];
 163 };
 164
 165 /*
 166  * This starts our ioctl sequence numbers *way* off from the ones
 167  * defined in ib_core.
 168  */
 169 #define SNOOP_CAPTURE_VERSION 0x1
 170
 171 #define IB_IOCTL_MAGIC          0x1b /* See Documentation/ioctl-number.txt */
 172 #define HFI1_SNOOP_IOC_MAGIC IB_IOCTL_MAGIC
 173 #define HFI1_SNOOP_IOC_BASE_SEQ 0x80
 174
 175 #define HFI1_SNOOP_IOCGETLINKSTATE \
 176         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ)
 177 #define HFI1_SNOOP_IOCSETLINKSTATE \
 178         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 1)
 179 #define HFI1_SNOOP_IOCCLEARQUEUE \
 180         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 2)
 181 #define HFI1_SNOOP_IOCCLEARFILTER \
 182         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 3)
 183 #define HFI1_SNOOP_IOCSETFILTER \
 184         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 4)
 185 #define HFI1_SNOOP_IOCGETVERSION \
 186         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 5)
 187 #define HFI1_SNOOP_IOCSET_OPTS \
 188         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 6)
 189
 190 /*
 191  * These offsets +6/+7 could change, but these are already known and used
 192  * IOCTL numbers so don't change them without a good reason.
 193  */
 194 #define HFI1_SNOOP_IOCGETLINKSTATE_EXTRA \
 195         _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 6, \
 196                 struct hfi1_link_info)
 197 #define HFI1_SNOOP_IOCSETLINKSTATE_EXTRA \
 198         _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 7, \
 199                 struct hfi1_link_info)
 200
 201 static int hfi1_snoop_open(struct inode *in, struct file *fp);
 202 static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
 203                                size_t pkt_len, loff_t *off);
 204 static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
 205                                 size_t count, loff_t *off);
 206 static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);
 207 static unsigned int hfi1_snoop_poll(struct file *fp,
 208                                     struct poll_table_struct *wait);
 209 static int hfi1_snoop_release(struct inode *in, struct file *fp);
 210
 211 struct hfi1_packet_filter_command {
 212         int opcode;
 213         int length;
 214         void *value_ptr;
 215 };
 216
 217 /* Can't re-use PKT_DIR_*GRESS here because 0 means no packets for this */
 218 #define HFI1_SNOOP_INGRESS 0x1
 219 #define HFI1_SNOOP_EGRESS  0x2
 220
 221 enum hfi1_packet_filter_opcodes {
 222         FILTER_BY_LID,
 223         FILTER_BY_DLID,
 224         FILTER_BY_MAD_MGMT_CLASS,
 225         FILTER_BY_QP_NUMBER,
 226         FILTER_BY_PKT_TYPE,
 227         FILTER_BY_SERVICE_LEVEL,
 228         FILTER_BY_PKEY,
 229         FILTER_BY_DIRECTION,
 230 };
 231
 232 static const struct file_operations snoop_file_ops = {
 233         .owner = THIS_MODULE,
 234         .open = hfi1_snoop_open,
 235         .read = hfi1_snoop_read,
 236         .unlocked_ioctl = hfi1_ioctl,
 237         .poll = hfi1_snoop_poll,
 238         .write = hfi1_snoop_write,
 239         .release = hfi1_snoop_release
 240 };
 241
 242 struct hfi1_filter_array {
 243         int (*filter)(void *, void *, void *);
 244 };
 245
 246 static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value);
 247 static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value);
 248 static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
 249                                       void *value);
 250 static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value);
 251 static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
 252                                      void *value);
 253 static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
 254                                         void *value);
 255 static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value);
 256 static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value);
 257
 258 static const struct hfi1_filter_array hfi1_filters[] = {
 259         { hfi1_filter_lid },
 260         { hfi1_filter_dlid },
 261         { hfi1_filter_mad_mgmt_class },
 262         { hfi1_filter_qp_number },
 263         { hfi1_filter_ibpacket_type },
 264         { hfi1_filter_ib_service_level },
 265         { hfi1_filter_ib_pkey },
 266         { hfi1_filter_direction },
 267 };
 268
 269 #define HFI1_MAX_FILTERS        ARRAY_SIZE(hfi1_filters)
 270 #define HFI1_DIAG_MINOR_BASE    129
 271
 272 static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name);
 273
 274 int hfi1_diag_add(struct hfi1_devdata *dd)
 275 {
 276         char name[16];
 277         int ret = 0;
 278
 279         snprintf(name, sizeof(name), "%s_diagpkt%d", class_name(),
 280                  dd->unit);
 281         /*
 282          * Do this for each device as opposed to the normal diagpkt
 283          * interface which is one per host
 284          */
 285         ret = hfi1_snoop_add(dd, name);
 286         if (ret)
 287                 dd_dev_err(dd, "Unable to init snoop/capture device");
 288
 289         snprintf(name, sizeof(name), "%s_diagpkt", class_name());
 290         if (atomic_inc_return(&diagpkt_count) == 1) {
 291                 ret = hfi1_cdev_init(HFI1_DIAGPKT_MINOR, name,
 292                                      &diagpkt_file_ops, &diagpkt_cdev,
 293                                      &diagpkt_device, false);
 294         }
 295
 296         return ret;
 297 }
 298
 299 /* this must be called w/ dd->snoop_in_lock held */
 300 static void drain_snoop_list(struct list_head *queue)
 301 {
 302         struct list_head *pos, *q;
 303         struct snoop_packet *packet;
 304
 305         list_for_each_safe(pos, q, queue) {
 306                 packet = list_entry(pos, struct snoop_packet, list);
 307                 list_del(pos);
 308                 kfree(packet);
 309         }
 310 }
 311
 312 static void hfi1_snoop_remove(struct hfi1_devdata *dd)
 313 {
 314         unsigned long flags = 0;
 315
 316         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 317         drain_snoop_list(&dd->hfi1_snoop.queue);
 318         hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev);
 319         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 320 }
 321
 322 void hfi1_diag_remove(struct hfi1_devdata *dd)
 323 {
 324         hfi1_snoop_remove(dd);
 325         if (atomic_dec_and_test(&diagpkt_count))
 326                 hfi1_cdev_cleanup(&diagpkt_cdev, &diagpkt_device);
 327         hfi1_cdev_cleanup(&dd->diag_cdev, &dd->diag_device);
 328 }
 329
 330 /*
 331  * Allocated structure shared between the credit return mechanism and
 332  * diagpkt_send().
 333  */
 334 struct diagpkt_wait {
 335         struct completion credits_returned;
 336         int code;
 337         atomic_t count;
 338 };
 339
 340 /*
 341  * When each side is finished with the structure, they call this.
 342  * The last user frees the structure.
 343  */
 344 static void put_diagpkt_wait(struct diagpkt_wait *wait)
 345 {
 346         if (atomic_dec_and_test(&wait->count))
 347                 kfree(wait);
 348 }
 349
 350 /*
 351  * Callback from the credit return code.  Set the complete, which
 352  * will let diapkt_send() continue.
 353  */
 354 static void diagpkt_complete(void *arg, int code)
 355 {
 356         struct diagpkt_wait *wait = (struct diagpkt_wait *)arg;
 357
 358         wait->code = code;
 359         complete(&wait->credits_returned);
 360         put_diagpkt_wait(wait); /* finished with the structure */
 361 }
 362
 363 /**
 364  * diagpkt_send - send a packet
 365  * @dp: diag packet descriptor
 366  */
 367 static ssize_t diagpkt_send(struct diag_pkt *dp)
 368 {
 369         struct hfi1_devdata *dd;
 370         struct send_context *sc;
 371         struct pio_buf *pbuf;
 372         u32 *tmpbuf = NULL;
 373         ssize_t ret = 0;
 374         u32 pkt_len, total_len;
 375         pio_release_cb credit_cb = NULL;
 376         void *credit_arg = NULL;
 377         struct diagpkt_wait *wait = NULL;
 378         int trycount = 0;
 379
 380         dd = hfi1_lookup(dp->unit);
 381         if (!dd || !(dd->flags & HFI1_PRESENT) || !dd->kregbase) {
 382                 ret = -ENODEV;
 383                 goto bail;
 384         }
 385         if (!(dd->flags & HFI1_INITTED)) {
 386                 /* no hardware, freeze, etc. */
 387                 ret = -ENODEV;
 388                 goto bail;
 389         }
 390
 391         if (dp->version != _DIAG_PKT_VERS) {
 392                 dd_dev_err(dd, "Invalid version %u for diagpkt_write\n",
 393                            dp->version);
 394                 ret = -EINVAL;
 395                 goto bail;
 396         }
 397
 398         /* send count must be an exact number of dwords */
 399         if (dp->len & 3) {
 400                 ret = -EINVAL;
 401                 goto bail;
 402         }
 403
 404         /* there is only port 1 */
 405         if (dp->port != 1) {
 406                 ret = -EINVAL;
 407                 goto bail;
 408         }
 409
 410         /* need a valid context */
 411         if (dp->sw_index >= dd->num_send_contexts) {
 412                 ret = -EINVAL;
 413                 goto bail;
 414         }
 415         /* can only use kernel contexts */
 416         if (dd->send_contexts[dp->sw_index].type != SC_KERNEL) {
 417                 ret = -EINVAL;
 418                 goto bail;
 419         }
 420         /* must be allocated */
 421         sc = dd->send_contexts[dp->sw_index].sc;
 422         if (!sc) {
 423                 ret = -EINVAL;
 424                 goto bail;
 425         }
 426         /* must be enabled */
 427         if (!(sc->flags & SCF_ENABLED)) {
 428                 ret = -EINVAL;
 429                 goto bail;
 430         }
 431
 432         /* allocate a buffer and copy the data in */
 433         tmpbuf = vmalloc(dp->len);
 434         if (!tmpbuf) {
 435                 ret = -ENOMEM;
 436                 goto bail;
 437         }
 438
 439         if (copy_from_user(tmpbuf,
 440                            (const void __user *)(unsigned long)dp->data,
 441                            dp->len)) {
 442                 ret = -EFAULT;
 443                 goto bail;
 444         }
 445
 446         /*
 447          * pkt_len is how much data we have to write, includes header and data.
 448          * total_len is length of the packet in Dwords plus the PBC should not
 449          * include the CRC.
 450          */
 451         pkt_len = dp->len >> 2;
 452         total_len = pkt_len + 2; /* PBC + packet */
 453
 454         /* if 0, fill in a default */
 455         if (dp->pbc == 0) {
 456                 struct hfi1_pportdata *ppd = dd->pport;
 457
 458                 hfi1_cdbg(PKT, "Generating PBC");
 459                 dp->pbc = create_pbc(ppd, 0, 0, 0, total_len);
 460         } else {
 461                 hfi1_cdbg(PKT, "Using passed in PBC");
 462         }
 463
 464         hfi1_cdbg(PKT, "Egress PBC content is 0x%llx", dp->pbc);
 465
 466         /*
 467          * The caller wants to wait until the packet is sent and to
 468          * check for errors.  The best we can do is wait until
 469          * the buffer credits are returned and check if any packet
 470          * error has occurred.  If there are any late errors, this
 471          * could miss it.  If there are other senders who generate
 472          * an error, this may find it.  However, in general, it
 473          * should catch most.
 474          */
 475         if (dp->flags & F_DIAGPKT_WAIT) {
 476                 /* always force a credit return */
 477                 dp->pbc |= PBC_CREDIT_RETURN;
 478                 /* turn on credit return interrupts */
 479                 sc_add_credit_return_intr(sc);
 480                 wait = kmalloc(sizeof(*wait), GFP_KERNEL);
 481                 if (!wait) {
 482                         ret = -ENOMEM;
 483                         goto bail;
 484                 }
 485                 init_completion(&wait->credits_returned);
 486                 atomic_set(&wait->count, 2);
 487                 wait->code = PRC_OK;
 488
 489                 credit_cb = diagpkt_complete;
 490                 credit_arg = wait;
 491         }
 492
 493 retry:
 494         pbuf = sc_buffer_alloc(sc, total_len, credit_cb, credit_arg);
 495         if (!pbuf) {
 496                 if (trycount == 0) {
 497                         /* force a credit return and try again */
 498                         sc_return_credits(sc);
 499                         trycount = 1;
 500                         goto retry;
 501                 }
 502                 /*
 503                  * No send buffer means no credit callback.  Undo
 504                  * the wait set-up that was done above.  We free wait
 505                  * because the callback will never be called.
 506                  */
 507                 if (dp->flags & F_DIAGPKT_WAIT) {
 508                         sc_del_credit_return_intr(sc);
 509                         kfree(wait);
 510                         wait = NULL;
 511                 }
 512                 ret = -ENOSPC;
 513                 goto bail;
 514         }
 515
 516         pio_copy(dd, pbuf, dp->pbc, tmpbuf, pkt_len);
 517         /* no flush needed as the HW knows the packet size */
 518
 519         ret = sizeof(*dp);
 520
 521         if (dp->flags & F_DIAGPKT_WAIT) {
 522                 /* wait for credit return */
 523                 ret = wait_for_completion_interruptible(
 524                                                 &wait->credits_returned);
 525                 /*
 526                  * If the wait returns an error, the wait was interrupted,
 527                  * e.g. with a ^C in the user program.  The callback is
 528                  * still pending.  This is OK as the wait structure is
 529                  * kmalloc'ed and the structure will free itself when
 530                  * all users are done with it.
 531                  *
 532                  * A context disable occurs on a send context restart, so
 533                  * include that in the list of errors below to check for.
 534                  * NOTE: PRC_FILL_ERR is at best informational and cannot
 535                  * be depended on.
 536                  */
 537                 if (!ret && (((wait->code & PRC_STATUS_ERR) ||
 538                               (wait->code & PRC_FILL_ERR) ||
 539                               (wait->code & PRC_SC_DISABLE))))
 540                         ret = -EIO;
 541
 542                 put_diagpkt_wait(wait); /* finished with the structure */
 543                 sc_del_credit_return_intr(sc);
 544         }
 545
 546 bail:
 547         vfree(tmpbuf);
 548         return ret;
 549 }
 550
 551 static ssize_t diagpkt_write(struct file *fp, const char __user *data,
 552                              size_t count, loff_t *off)
 553 {
 554         struct hfi1_devdata *dd;
 555         struct send_context *sc;
 556         u8 vl;
 557
 558         struct diag_pkt dp;
 559
 560         if (count != sizeof(dp))
 561                 return -EINVAL;
 562
 563         if (copy_from_user(&dp, data, sizeof(dp)))
 564                 return -EFAULT;
 565
 566         /*
 567         * The Send Context is derived from the PbcVL value
 568         * if PBC is populated
 569         */
 570         if (dp.pbc) {
 571                 dd = hfi1_lookup(dp.unit);
 572                 if (!dd)
 573                         return -ENODEV;
 574                 vl = (dp.pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
 575                 sc = dd->vld[vl].sc;
 576                 if (sc) {
 577                         dp.sw_index = sc->sw_index;
 578                         hfi1_cdbg(
 579                                PKT,
 580                                "Packet sent over VL %d via Send Context %u(%u)",
 581                                vl, sc->sw_index, sc->hw_context);
 582                 }
 583         }
 584
 585         return diagpkt_send(&dp);
 586 }
 587
 588 static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name)
 589 {
 590         int ret = 0;
 591
 592         dd->hfi1_snoop.mode_flag = 0;
 593         spin_lock_init(&dd->hfi1_snoop.snoop_lock);
 594         INIT_LIST_HEAD(&dd->hfi1_snoop.queue);
 595         init_waitqueue_head(&dd->hfi1_snoop.waitq);
 596
 597         ret = hfi1_cdev_init(HFI1_SNOOP_CAPTURE_BASE + dd->unit, name,
 598                              &snoop_file_ops,
 599                              &dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev,
 600                              false);
 601
 602         if (ret) {
 603                 dd_dev_err(dd, "Couldn't create %s device: %d", name, ret);
 604                 hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev,
 605                                   &dd->hfi1_snoop.class_dev);
 606         }
 607
 608         return ret;
 609 }
 610
 611 static struct hfi1_devdata *hfi1_dd_from_sc_inode(struct inode *in)
 612 {
 613         int unit = iminor(in) - HFI1_SNOOP_CAPTURE_BASE;
 614         struct hfi1_devdata *dd;
 615
 616         dd = hfi1_lookup(unit);
 617         return dd;
 618 }
 619
 620 /* clear or restore send context integrity checks */
 621 static void adjust_integrity_checks(struct hfi1_devdata *dd)
 622 {
 623         struct send_context *sc;
 624         unsigned long sc_flags;
 625         int i;
 626
 627         spin_lock_irqsave(&dd->sc_lock, sc_flags);
 628         for (i = 0; i < dd->num_send_contexts; i++) {
 629                 int enable;
 630
 631                 sc = dd->send_contexts[i].sc;
 632
 633                 if (!sc)
 634                         continue;       /* not allocated */
 635
 636                 enable = likely(!HFI1_CAP_IS_KSET(NO_INTEGRITY)) &&
 637                          dd->hfi1_snoop.mode_flag != HFI1_PORT_SNOOP_MODE;
 638
 639                 set_pio_integrity(sc);
 640
 641                 if (enable) /* take HFI_CAP_* flags into account */
 642                         hfi1_init_ctxt(sc);
 643         }
 644         spin_unlock_irqrestore(&dd->sc_lock, sc_flags);
 645 }
 646
 647 static int hfi1_snoop_open(struct inode *in, struct file *fp)
 648 {
 649         int ret;
 650         int mode_flag = 0;
 651         unsigned long flags = 0;
 652         struct hfi1_devdata *dd;
 653         struct list_head *queue;
 654
 655         mutex_lock(&hfi1_mutex);
 656
 657         dd = hfi1_dd_from_sc_inode(in);
 658         if (!dd) {
 659                 ret = -ENODEV;
 660                 goto bail;
 661         }
 662
 663         /*
 664          * File mode determines snoop or capture. Some existing user
 665          * applications expect the capture device to be able to be opened RDWR
 666          * because they expect a dedicated capture device. For this reason we
 667          * support a module param to force capture mode even if the file open
 668          * mode matches snoop.
 669          */
 670         if ((fp->f_flags & O_ACCMODE) == O_RDONLY) {
 671                 snoop_dbg("Capture Enabled");
 672                 mode_flag = HFI1_PORT_CAPTURE_MODE;
 673         } else if ((fp->f_flags & O_ACCMODE) == O_RDWR) {
 674                 snoop_dbg("Snoop Enabled");
 675                 mode_flag = HFI1_PORT_SNOOP_MODE;
 676         } else {
 677                 snoop_dbg("Invalid");
 678                 ret =  -EINVAL;
 679                 goto bail;
 680         }
 681         queue = &dd->hfi1_snoop.queue;
 682
 683         /*
 684          * We are not supporting snoop and capture at the same time.
 685          */
 686         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 687         if (dd->hfi1_snoop.mode_flag) {
 688                 ret = -EBUSY;
 689                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 690                 goto bail;
 691         }
 692
 693         dd->hfi1_snoop.mode_flag = mode_flag;
 694         drain_snoop_list(queue);
 695
 696         dd->hfi1_snoop.filter_callback = NULL;
 697         dd->hfi1_snoop.filter_value = NULL;
 698
 699         /*
 700          * Send side packet integrity checks are not helpful when snooping so
 701          * disable and re-enable when we stop snooping.
 702          */
 703         if (mode_flag == HFI1_PORT_SNOOP_MODE) {
 704                 /* clear after snoop mode is on */
 705                 adjust_integrity_checks(dd); /* clear */
 706
 707                 /*
 708                  * We also do not want to be doing the DLID LMC check for
 709                  * ingressed packets.
 710                  */
 711                 dd->hfi1_snoop.dcc_cfg = read_csr(dd, DCC_CFG_PORT_CONFIG1);
 712                 write_csr(dd, DCC_CFG_PORT_CONFIG1,
 713                           (dd->hfi1_snoop.dcc_cfg >> 32) << 32);
 714         }
 715
 716         /*
 717          * As soon as we set these function pointers the recv and send handlers
 718          * are active. This is a race condition so we must make sure to drain
 719          * the queue and init filter values above. Technically we should add
 720          * locking here but all that will happen is on recv a packet will get
 721          * allocated and get stuck on the snoop_lock before getting added to the
 722          * queue. Same goes for send.
 723          */
 724         dd->rhf_rcv_function_map = snoop_rhf_rcv_functions;
 725         dd->process_pio_send = snoop_send_pio_handler;
 726         dd->process_dma_send = snoop_send_pio_handler;
 727         dd->pio_inline_send = snoop_inline_pio_send;
 728
 729         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 730         ret = 0;
 731
 732 bail:
 733         mutex_unlock(&hfi1_mutex);
 734
 735         return ret;
 736 }
 737
 738 static int hfi1_snoop_release(struct inode *in, struct file *fp)
 739 {
 740         unsigned long flags = 0;
 741         struct hfi1_devdata *dd;
 742         int mode_flag;
 743
 744         dd = hfi1_dd_from_sc_inode(in);
 745         if (!dd)
 746                 return -ENODEV;
 747
 748         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 749
 750         /* clear the snoop mode before re-adjusting send context CSRs */
 751         mode_flag = dd->hfi1_snoop.mode_flag;
 752         dd->hfi1_snoop.mode_flag = 0;
 753
 754         /*
 755          * Drain the queue and clear the filters we are done with it. Don't
 756          * forget to restore the packet integrity checks
 757          */
 758         drain_snoop_list(&dd->hfi1_snoop.queue);
 759         if (mode_flag == HFI1_PORT_SNOOP_MODE) {
 760                 /* restore after snoop mode is clear */
 761                 adjust_integrity_checks(dd); /* restore */
 762
 763                 /*
 764                  * Also should probably reset the DCC_CONFIG1 register for DLID
 765                  * checking on incoming packets again. Use the value saved when
 766                  * opening the snoop device.
 767                  */
 768                 write_csr(dd, DCC_CFG_PORT_CONFIG1, dd->hfi1_snoop.dcc_cfg);
 769         }
 770
 771         dd->hfi1_snoop.filter_callback = NULL;
 772         kfree(dd->hfi1_snoop.filter_value);
 773         dd->hfi1_snoop.filter_value = NULL;
 774
 775         /*
 776          * User is done snooping and capturing, return control to the normal
 777          * handler. Re-enable SDMA handling.
 778          */
 779         dd->rhf_rcv_function_map = dd->normal_rhf_rcv_functions;
 780         dd->process_pio_send = hfi1_verbs_send_pio;
 781         dd->process_dma_send = hfi1_verbs_send_dma;
 782         dd->pio_inline_send = pio_copy;
 783
 784         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 785
 786         snoop_dbg("snoop/capture device released");
 787
 788         return 0;
 789 }
 790
 791 static unsigned int hfi1_snoop_poll(struct file *fp,
 792                                     struct poll_table_struct *wait)
 793 {
 794         int ret = 0;
 795         unsigned long flags = 0;
 796
 797         struct hfi1_devdata *dd;
 798
 799         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 800         if (!dd)
 801                 return -ENODEV;
 802
 803         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 804
 805         poll_wait(fp, &dd->hfi1_snoop.waitq, wait);
 806         if (!list_empty(&dd->hfi1_snoop.queue))
 807                 ret |= POLLIN | POLLRDNORM;
 808
 809         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 810         return ret;
 811 }
 812
 813 static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
 814                                 size_t count, loff_t *off)
 815 {
 816         struct diag_pkt dpkt;
 817         struct hfi1_devdata *dd;
 818         size_t ret;
 819         u8 byte_two, sl, sc5, sc4, vl, byte_one;
 820         struct send_context *sc;
 821         u32 len;
 822         u64 pbc;
 823         struct hfi1_ibport *ibp;
 824         struct hfi1_pportdata *ppd;
 825
 826         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 827         if (!dd)
 828                 return -ENODEV;
 829
 830         ppd = dd->pport;
 831         snoop_dbg("received %lu bytes from user", count);
 832
 833         memset(&dpkt, 0, sizeof(struct diag_pkt));
 834         dpkt.version = _DIAG_PKT_VERS;
 835         dpkt.unit = dd->unit;
 836         dpkt.port = 1;
 837
 838         if (likely(!(snoop_flags & SNOOP_USE_METADATA))) {
 839                 /*
 840                 * We need to generate the PBC and not let diagpkt_send do it,
 841                 * to do this we need the VL and the length in dwords.
 842                 * The VL can be determined by using the SL and looking up the
 843                 * SC. Then the SC can be converted into VL. The exception to
 844                 * this is those packets which are from an SMI queue pair.
 845                 * Since we can't detect anything about the QP here we have to
 846                 * rely on the SC. If its 0xF then we assume its SMI and
 847                 * do not look at the SL.
 848                 */
 849                 if (copy_from_user(&byte_one, data, 1))
 850                         return -EINVAL;
 851
 852                 if (copy_from_user(&byte_two, data + 1, 1))
 853                         return -EINVAL;
 854
 855                 sc4 = (byte_one >> 4) & 0xf;
 856                 if (sc4 == 0xF) {
 857                         snoop_dbg("Detected VL15 packet ignoring SL in packet");
 858                         vl = sc4;
 859                 } else {
 860                         sl = (byte_two >> 4) & 0xf;
 861                         ibp = to_iport(&dd->verbs_dev.rdi.ibdev, 1);
 862                         sc5 = ibp->sl_to_sc[sl];
 863                         vl = sc_to_vlt(dd, sc5);
 864                         if (vl != sc4) {
 865                                 snoop_dbg("VL %d does not match SC %d of packet",
 866                                           vl, sc4);
 867                                 return -EINVAL;
 868                         }
 869                 }
 870
 871                 sc = dd->vld[vl].sc; /* Look up the context based on VL */
 872                 if (sc) {
 873                         dpkt.sw_index = sc->sw_index;
 874                         snoop_dbg("Sending on context %u(%u)", sc->sw_index,
 875                                   sc->hw_context);
 876                 } else {
 877                         snoop_dbg("Could not find context for vl %d", vl);
 878                         return -EINVAL;
 879                 }
 880
 881                 len = (count >> 2) + 2; /* Add in PBC */
 882                 pbc = create_pbc(ppd, 0, 0, vl, len);
 883         } else {
 884                 if (copy_from_user(&pbc, data, sizeof(pbc)))
 885                         return -EINVAL;
 886                 vl = (pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
 887                 sc = dd->vld[vl].sc; /* Look up the context based on VL */
 888                 if (sc) {
 889                         dpkt.sw_index = sc->sw_index;
 890                 } else {
 891                         snoop_dbg("Could not find context for vl %d", vl);
 892                         return -EINVAL;
 893                 }
 894                 data += sizeof(pbc);
 895                 count -= sizeof(pbc);
 896         }
 897         dpkt.len = count;
 898         dpkt.data = (unsigned long)data;
 899
 900         snoop_dbg("PBC: vl=0x%llx Length=0x%llx",
 901                   (pbc >> 12) & 0xf,
 902                   (pbc & 0xfff));
 903
 904         dpkt.pbc = pbc;
 905         ret = diagpkt_send(&dpkt);
 906         /*
 907          * diagpkt_send only returns number of bytes in the diagpkt so patch
 908          * that up here before returning.
 909          */
 910         if (ret == sizeof(dpkt))
 911                 return count;
 912
 913         return ret;
 914 }
 915
 916 static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
 917                                size_t pkt_len, loff_t *off)
 918 {
 919         ssize_t ret = 0;
 920         unsigned long flags = 0;
 921         struct snoop_packet *packet = NULL;
 922         struct hfi1_devdata *dd;
 923
 924         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 925         if (!dd)
 926                 return -ENODEV;
 927
 928         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 929
 930         while (list_empty(&dd->hfi1_snoop.queue)) {
 931                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 932
 933                 if (fp->f_flags & O_NONBLOCK)
 934                         return -EAGAIN;
 935
 936                 if (wait_event_interruptible(
 937                                 dd->hfi1_snoop.waitq,
 938                                 !list_empty(&dd->hfi1_snoop.queue)))
 939                         return -EINTR;
 940
 941                 spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 942         }
 943
 944         if (!list_empty(&dd->hfi1_snoop.queue)) {
 945                 packet = list_entry(dd->hfi1_snoop.queue.next,
 946                                     struct snoop_packet, list);
 947                 list_del(&packet->list);
 948                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 949                 if (pkt_len >= packet->total_len) {
 950                         if (copy_to_user(data, packet->data,
 951                                          packet->total_len))
 952                                 ret = -EFAULT;
 953                         else
 954                                 ret = packet->total_len;
 955                 } else {
 956                         ret = -EINVAL;
 957                 }
 958
 959                 kfree(packet);
 960         } else {
 961                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 962         }
 963
 964         return ret;
 965 }
 966
 967 /**
 968  * hfi1_assign_snoop_link_credits -- Set up credits for VL15 and others
 969  * @ppd : ptr to hfi1 port data
 970  * @value : options from user space
 971  *
 972  * Assumes the rest of the CM credit registers are zero from a
 973  * previous global or credit reset.
 974  * Leave shared count at zero for both global and all vls.
 975  * In snoop mode ideally we don't use shared credits
 976  * Reserve 8.5k for VL15
 977  * If total credits less than 8.5kbytes return error.
 978  * Divide the rest of the credits across VL0 to VL7 and if
 979  * each of these levels has less than 34 credits (at least 2048 + 128 bytes)
 980  * return with an error.
 981  * The credit registers will be reset to zero on link negotiation or link up
 982  * so this function should be activated from user space only if the port has
 983  * gone past link negotiation and link up.
 984  *
 985  * Return -- 0 if successful else error condition
 986  *
 987  */
 988 static long hfi1_assign_snoop_link_credits(struct hfi1_pportdata *ppd,
 989                                            int value)
 990 {
 991 #define  OPA_MIN_PER_VL_CREDITS  34  /* 2048 + 128 bytes */
 992         struct buffer_control t;
 993         int i;
 994         struct hfi1_devdata *dd = ppd->dd;
 995         u16  total_credits = (value >> 16) & 0xffff;
 996         u16  vl15_credits = dd->vl15_init / 2;
 997         u16  per_vl_credits;
 998         __be16 be_per_vl_credits;
 999
1000         if (!(ppd->host_link_state & HLS_UP))
1001                 goto err_exit;
1002         if (total_credits  <  vl15_credits)
1003                 goto err_exit;
1004
1005         per_vl_credits = (total_credits - vl15_credits) / TXE_NUM_DATA_VL;
1006
1007         if (per_vl_credits < OPA_MIN_PER_VL_CREDITS)
1008                 goto err_exit;
1009
1010         memset(&t, 0, sizeof(t));
1011         be_per_vl_credits = cpu_to_be16(per_vl_credits);
1012
1013         for (i = 0; i < TXE_NUM_DATA_VL; i++)
1014                 t.vl[i].dedicated = be_per_vl_credits;
1015
1016         t.vl[15].dedicated  = cpu_to_be16(vl15_credits);
1017         return set_buffer_control(ppd, &t);
1018
1019 err_exit:
1020         snoop_dbg("port_state = 0x%x, total_credits = %d, vl15_credits = %d",
1021                   ppd->host_link_state, total_credits, vl15_credits);
1022
1023         return -EINVAL;
1024 }
1025
1026 static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
1027 {
1028         struct hfi1_devdata *dd;
1029         void *filter_value = NULL;
1030         long ret = 0;
1031         int value = 0;
1032         u8 phys_state = 0;
1033         u8 link_state = 0;
1034         u16 dev_state = 0;
1035         unsigned long flags = 0;
1036         unsigned long *argp = NULL;
1037         struct hfi1_packet_filter_command filter_cmd = {0};
1038         int mode_flag = 0;
1039         struct hfi1_pportdata *ppd = NULL;
1040         unsigned int index;
1041         struct hfi1_link_info link_info;
1042         int read_cmd, write_cmd, read_ok, write_ok;
1043
1044         dd = hfi1_dd_from_sc_inode(fp->f_inode);
1045         if (!dd)
1046                 return -ENODEV;
1047
1048         mode_flag = dd->hfi1_snoop.mode_flag;
1049         read_cmd = _IOC_DIR(cmd) & _IOC_READ;
1050         write_cmd = _IOC_DIR(cmd) & _IOC_WRITE;
1051         write_ok = access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd));
1052         read_ok = access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
1053
1054         if ((read_cmd && !write_ok) || (write_cmd && !read_ok))
1055                 return -EFAULT;
1056
1057         if (!capable(CAP_SYS_ADMIN))
1058                 return -EPERM;
1059
1060         if ((mode_flag & HFI1_PORT_CAPTURE_MODE) &&
1061             (cmd != HFI1_SNOOP_IOCCLEARQUEUE) &&
1062             (cmd != HFI1_SNOOP_IOCCLEARFILTER) &&
1063             (cmd != HFI1_SNOOP_IOCSETFILTER))
1064                 /* Capture devices are allowed only 3 operations
1065                  * 1.Clear capture queue
1066                  * 2.Clear capture filter
1067                  * 3.Set capture filter
1068                  * Other are invalid.
1069                  */
1070                 return -EINVAL;
1071
1072         switch (cmd) {
1073         case HFI1_SNOOP_IOCSETLINKSTATE_EXTRA:
1074                 memset(&link_info, 0, sizeof(link_info));
1075
1076                 if (copy_from_user(&link_info,
1077                                    (struct hfi1_link_info __user *)arg,
1078                                    sizeof(link_info)))
1079                         return -EFAULT;
1080
1081                 value = link_info.port_state;
1082                 index = link_info.port_number;
1083                 if (index > dd->num_pports - 1)
1084                         return -EINVAL;
1085
1086                 ppd = &dd->pport[index];
1087                 if (!ppd)
1088                         return -EINVAL;
1089
1090                 /* What we want to transition to */
1091                 phys_state = (value >> 4) & 0xF;
1092                 link_state = value & 0xF;
1093                 snoop_dbg("Setting link state 0x%x", value);
1094
1095                 switch (link_state) {
1096                 case IB_PORT_NOP:
1097                         if (phys_state == 0)
1098                                 break;
1099                                 /* fall through */
1100                 case IB_PORT_DOWN:
1101                         switch (phys_state) {
1102                         case 0:
1103                                 dev_state = HLS_DN_DOWNDEF;
1104                                 break;
1105                         case 2:
1106                                 dev_state = HLS_DN_POLL;
1107                                 break;
1108                         case 3:
1109                                 dev_state = HLS_DN_DISABLE;
1110                                 break;
1111                         default:
1112                                 return -EINVAL;
1113                         }
1114                         ret = set_link_state(ppd, dev_state);
1115                         break;
1116                 case IB_PORT_ARMED:
1117                         ret = set_link_state(ppd, HLS_UP_ARMED);
1118                         if (!ret)
1119                                 send_idle_sma(dd, SMA_IDLE_ARM);
1120                         break;
1121                 case IB_PORT_ACTIVE:
1122                         ret = set_link_state(ppd, HLS_UP_ACTIVE);
1123                         if (!ret)
1124                                 send_idle_sma(dd, SMA_IDLE_ACTIVE);
1125                         break;
1126                 default:
1127                         return -EINVAL;
1128                 }
1129
1130                 if (ret)
1131                         break;
1132                 /* fall through */
1133         case HFI1_SNOOP_IOCGETLINKSTATE:
1134         case HFI1_SNOOP_IOCGETLINKSTATE_EXTRA:
1135                 if (cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) {
1136                         memset(&link_info, 0, sizeof(link_info));
1137                         if (copy_from_user(&link_info,
1138                                            (struct hfi1_link_info __user *)arg,
1139                                            sizeof(link_info)))
1140                                 return -EFAULT;
1141                         index = link_info.port_number;
1142                 } else {
1143                         ret = __get_user(index, (int __user *)arg);
1144                         if (ret !=  0)
1145                                 break;
1146                 }
1147
1148                 if (index > dd->num_pports - 1)
1149                         return -EINVAL;
1150
1151                 ppd = &dd->pport[index];
1152                 if (!ppd)
1153                         return -EINVAL;
1154
1155                 value = hfi1_ibphys_portstate(ppd);
1156                 value <<= 4;
1157                 value |= driver_lstate(ppd);
1158
1159                 snoop_dbg("Link port | Link State: %d", value);
1160
1161                 if ((cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) ||
1162                     (cmd == HFI1_SNOOP_IOCSETLINKSTATE_EXTRA)) {
1163                         link_info.port_state = value;
1164                         link_info.node_guid = cpu_to_be64(ppd->guid);
1165                         link_info.link_speed_active =
1166                                                 ppd->link_speed_active;
1167                         link_info.link_width_active =
1168                                                 ppd->link_width_active;
1169                         if (copy_to_user((struct hfi1_link_info __user *)arg,
1170                                          &link_info, sizeof(link_info)))
1171                                 return -EFAULT;
1172                 } else {
1173                         ret = __put_user(value, (int __user *)arg);
1174                 }
1175                 break;
1176
1177         case HFI1_SNOOP_IOCCLEARQUEUE:
1178                 snoop_dbg("Clearing snoop queue");
1179                 spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1180                 drain_snoop_list(&dd->hfi1_snoop.queue);
1181                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1182                 break;
1183
1184         case HFI1_SNOOP_IOCCLEARFILTER:
1185                 snoop_dbg("Clearing filter");
1186                 spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1187                 if (dd->hfi1_snoop.filter_callback) {
1188                         /* Drain packets first */
1189                         drain_snoop_list(&dd->hfi1_snoop.queue);
1190                         dd->hfi1_snoop.filter_callback = NULL;
1191                 }
1192                 kfree(dd->hfi1_snoop.filter_value);
1193                 dd->hfi1_snoop.filter_value = NULL;
1194                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1195                 break;
1196
1197         case HFI1_SNOOP_IOCSETFILTER:
1198                 snoop_dbg("Setting filter");
1199                 /* just copy command structure */
1200                 argp = (unsigned long *)arg;
1201                 if (copy_from_user(&filter_cmd, (void __user *)argp,
1202                                    sizeof(filter_cmd)))
1203                         return -EFAULT;
1204
1205                 if (filter_cmd.opcode >= HFI1_MAX_FILTERS) {
1206                         pr_alert("Invalid opcode in request\n");
1207                         return -EINVAL;
1208                 }
1209
1210                 snoop_dbg("Opcode %d Len %d Ptr %p",
1211                           filter_cmd.opcode, filter_cmd.length,
1212                           filter_cmd.value_ptr);
1213
1214                 filter_value = kcalloc(filter_cmd.length, sizeof(u8),
1215                                        GFP_KERNEL);
1216                 if (!filter_value)
1217                         return -ENOMEM;
1218
1219                 /* copy remaining data from userspace */
1220                 if (copy_from_user((u8 *)filter_value,
1221                                    (void __user *)filter_cmd.value_ptr,
1222                                    filter_cmd.length)) {
1223                         kfree(filter_value);
1224                         return -EFAULT;
1225                 }
1226                 /* Drain packets first */
1227                 spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1228                 drain_snoop_list(&dd->hfi1_snoop.queue);
1229                 dd->hfi1_snoop.filter_callback =
1230                         hfi1_filters[filter_cmd.opcode].filter;
1231                 /* just in case we see back to back sets */
1232                 kfree(dd->hfi1_snoop.filter_value);
1233                 dd->hfi1_snoop.filter_value = filter_value;
1234                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1235                 break;
1236         case HFI1_SNOOP_IOCGETVERSION:
1237                 value = SNOOP_CAPTURE_VERSION;
1238                 snoop_dbg("Getting version: %d", value);
1239                 ret = __put_user(value, (int __user *)arg);
1240                 break;
1241         case HFI1_SNOOP_IOCSET_OPTS:
1242                 snoop_flags = 0;
1243                 ret = __get_user(value, (int __user *)arg);
1244                 if (ret != 0)
1245                         break;
1246
1247                 snoop_dbg("Setting snoop option %d", value);
1248                 if (value & SNOOP_DROP_SEND)
1249                         snoop_flags |= SNOOP_DROP_SEND;
1250                 if (value & SNOOP_USE_METADATA)
1251                         snoop_flags |= SNOOP_USE_METADATA;
1252                 if (value & (SNOOP_SET_VL0TOVL15)) {
1253                         ppd = &dd->pport[0];  /* first port will do */
1254                         ret = hfi1_assign_snoop_link_credits(ppd, value);
1255                 }
1256                 break;
1257         default:
1258                 return -ENOTTY;
1259         }
1260
1261         return ret;
1262 }
1263
1264 static void snoop_list_add_tail(struct snoop_packet *packet,
1265                                 struct hfi1_devdata *dd)
1266 {
1267         unsigned long flags = 0;
1268
1269         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1270         if (likely((dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) ||
1271                    (dd->hfi1_snoop.mode_flag & HFI1_PORT_CAPTURE_MODE))) {
1272                 list_add_tail(&packet->list, &dd->hfi1_snoop.queue);
1273                 snoop_dbg("Added packet to list");
1274         }
1275
1276         /*
1277          * Technically we can could have closed the snoop device while waiting
1278          * on the above lock and it is gone now. The snoop mode_flag will
1279          * prevent us from adding the packet to the queue though.
1280          */
1281
1282         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1283         wake_up_interruptible(&dd->hfi1_snoop.waitq);
1284 }
1285
1286 static inline int hfi1_filter_check(void *val, const char *msg)
1287 {
1288         if (!val) {
1289                 snoop_dbg("Error invalid %s value for filter", msg);
1290                 return HFI1_FILTER_ERR;
1291         }
1292         return 0;
1293 }
1294
1295 static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value)
1296 {
1297         struct hfi1_ib_header *hdr;
1298         int ret;
1299
1300         ret = hfi1_filter_check(ibhdr, "header");
1301         if (ret)
1302                 return ret;
1303         ret = hfi1_filter_check(value, "user");
1304         if (ret)
1305                 return ret;
1306         hdr = (struct hfi1_ib_header *)ibhdr;
1307
1308         if (*((u16 *)value) == be16_to_cpu(hdr->lrh[3])) /* matches slid */
1309                 return HFI1_FILTER_HIT; /* matched */
1310
1311         return HFI1_FILTER_MISS; /* Not matched */
1312 }
1313
1314 static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value)
1315 {
1316         struct hfi1_ib_header *hdr;
1317         int ret;
1318
1319         ret = hfi1_filter_check(ibhdr, "header");
1320         if (ret)
1321                 return ret;
1322         ret = hfi1_filter_check(value, "user");
1323         if (ret)
1324                 return ret;
1325
1326         hdr = (struct hfi1_ib_header *)ibhdr;
1327
1328         if (*((u16 *)value) == be16_to_cpu(hdr->lrh[1]))
1329                 return HFI1_FILTER_HIT;
1330
1331         return HFI1_FILTER_MISS;
1332 }
1333
1334 /* Not valid for outgoing packets, send handler passes null for data*/
1335 static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
1336                                       void *value)
1337 {
1338         struct hfi1_ib_header *hdr;
1339         struct hfi1_other_headers *ohdr = NULL;
1340         struct ib_smp *smp = NULL;
1341         u32 qpn = 0;
1342         int ret;
1343
1344         ret = hfi1_filter_check(ibhdr, "header");
1345         if (ret)
1346                 return ret;
1347         ret = hfi1_filter_check(packet_data, "packet_data");
1348         if (ret)
1349                 return ret;
1350         ret = hfi1_filter_check(value, "user");
1351         if (ret)
1352                 return ret;
1353
1354         hdr = (struct hfi1_ib_header *)ibhdr;
1355
1356         /* Check for GRH */
1357         if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
1358                 ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
1359         else
1360                 ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
1361
1362         qpn = be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF;
1363         if (qpn <= 1) {
1364                 smp = (struct ib_smp *)packet_data;
1365                 if (*((u8 *)value) == smp->mgmt_class)
1366                         return HFI1_FILTER_HIT;
1367                 else
1368                         return HFI1_FILTER_MISS;
1369         }
1370         return HFI1_FILTER_ERR;
1371 }
1372
1373 static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value)
1374 {
1375         struct hfi1_ib_header *hdr;
1376         struct hfi1_other_headers *ohdr = NULL;
1377         int ret;
1378
1379         ret = hfi1_filter_check(ibhdr, "header");
1380         if (ret)
1381                 return ret;
1382         ret = hfi1_filter_check(value, "user");
1383         if (ret)
1384                 return ret;
1385
1386         hdr = (struct hfi1_ib_header *)ibhdr;
1387
1388         /* Check for GRH */
1389         if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
1390                 ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
1391         else
1392                 ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
1393         if (*((u32 *)value) == (be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF))
1394                 return HFI1_FILTER_HIT;
1395
1396         return HFI1_FILTER_MISS;
1397 }
1398
1399 static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
1400                                      void *value)
1401 {
1402         u32 lnh = 0;
1403         u8 opcode = 0;
1404         struct hfi1_ib_header *hdr;
1405         struct hfi1_other_headers *ohdr = NULL;
1406         int ret;
1407
1408         ret = hfi1_filter_check(ibhdr, "header");
1409         if (ret)
1410                 return ret;
1411         ret = hfi1_filter_check(value, "user");
1412         if (ret)
1413                 return ret;
1414
1415         hdr = (struct hfi1_ib_header *)ibhdr;
1416
1417         lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
1418
1419         if (lnh == HFI1_LRH_BTH)
1420                 ohdr = &hdr->u.oth;
1421         else if (lnh == HFI1_LRH_GRH)
1422                 ohdr = &hdr->u.l.oth;
1423         else
1424                 return HFI1_FILTER_ERR;
1425
1426         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
1427
1428         if (*((u8 *)value) == ((opcode >> 5) & 0x7))
1429                 return HFI1_FILTER_HIT;
1430
1431         return HFI1_FILTER_MISS;
1432 }
1433
1434 static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
1435                                         void *value)
1436 {
1437         struct hfi1_ib_header *hdr;
1438         int ret;
1439
1440         ret = hfi1_filter_check(ibhdr, "header");
1441         if (ret)
1442                 return ret;
1443         ret = hfi1_filter_check(value, "user");
1444         if (ret)
1445                 return ret;
1446
1447         hdr = (struct hfi1_ib_header *)ibhdr;
1448
1449         if ((*((u8 *)value)) == ((be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF))
1450                 return HFI1_FILTER_HIT;
1451
1452         return HFI1_FILTER_MISS;
1453 }
1454
1455 static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value)
1456 {
1457         u32 lnh = 0;
1458         struct hfi1_ib_header *hdr;
1459         struct hfi1_other_headers *ohdr = NULL;
1460         int ret;
1461
1462         ret = hfi1_filter_check(ibhdr, "header");
1463         if (ret)
1464                 return ret;
1465         ret = hfi1_filter_check(value, "user");
1466         if (ret)
1467                 return ret;
1468
1469         hdr = (struct hfi1_ib_header *)ibhdr;
1470
1471         lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
1472         if (lnh == HFI1_LRH_BTH)
1473                 ohdr = &hdr->u.oth;
1474         else if (lnh == HFI1_LRH_GRH)
1475                 ohdr = &hdr->u.l.oth;
1476         else
1477                 return HFI1_FILTER_ERR;
1478
1479         /* P_key is 16-bit entity, however top most bit indicates
1480          * type of membership. 0 for limited and 1 for Full.
1481          * Limited members cannot accept information from other
1482          * Limited members, but communication is allowed between
1483          * every other combination of membership.
1484          * Hence we'll omit comparing top-most bit while filtering
1485          */
1486
1487         if ((*(u16 *)value & 0x7FFF) ==
1488                 ((be32_to_cpu(ohdr->bth[0])) & 0x7FFF))
1489                 return HFI1_FILTER_HIT;
1490
1491         return HFI1_FILTER_MISS;
1492 }
1493
1494 /*
1495  * If packet_data is NULL then this is coming from one of the send functions.
1496  * Thus we know if its an ingressed or egressed packet.
1497  */
1498 static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value)
1499 {
1500         u8 user_dir = *(u8 *)value;
1501         int ret;
1502
1503         ret = hfi1_filter_check(value, "user");
1504         if (ret)
1505                 return ret;
1506
1507         if (packet_data) {
1508                 /* Incoming packet */
1509                 if (user_dir & HFI1_SNOOP_INGRESS)
1510                         return HFI1_FILTER_HIT;
1511         } else {
1512                 /* Outgoing packet */
1513                 if (user_dir & HFI1_SNOOP_EGRESS)
1514                         return HFI1_FILTER_HIT;
1515         }
1516
1517         return HFI1_FILTER_MISS;
1518 }
1519
1520 /*
1521  * Allocate a snoop packet. The structure that is stored in the ring buffer, not
1522  * to be confused with an hfi packet type.
1523  */
1524 static struct snoop_packet *allocate_snoop_packet(u32 hdr_len,
1525                                                   u32 data_len,
1526                                                   u32 md_len)
1527 {
1528         struct snoop_packet *packet;
1529
1530         packet = kzalloc(sizeof(*packet) + hdr_len + data_len
1531                          + md_len,
1532                          GFP_ATOMIC | __GFP_NOWARN);
1533         if (likely(packet))
1534                 INIT_LIST_HEAD(&packet->list);
1535
1536         return packet;
1537 }
1538
1539 /*
1540  * Instead of having snoop and capture code intermixed with the recv functions,
1541  * both the interrupt handler and hfi1_ib_rcv() we are going to hijack the call
1542  * and land in here for snoop/capture but if not enabled the call will go
1543  * through as before. This gives us a single point to constrain all of the snoop
1544  * snoop recv logic. There is nothing special that needs to happen for bypass
1545  * packets. This routine should not try to look into the packet. It just copied
1546  * it. There is no guarantee for filters when it comes to bypass packets as
1547  * there is no specific support. Bottom line is this routine does now even know
1548  * what a bypass packet is.
1549  */
1550 int snoop_recv_handler(struct hfi1_packet *packet)
1551 {
1552         struct hfi1_pportdata *ppd = packet->rcd->ppd;
1553         struct hfi1_ib_header *hdr = packet->hdr;
1554         int header_size = packet->hlen;
1555         void *data = packet->ebuf;
1556         u32 tlen = packet->tlen;
1557         struct snoop_packet *s_packet = NULL;
1558         int ret;
1559         int snoop_mode = 0;
1560         u32 md_len = 0;
1561         struct capture_md md;
1562
1563         snoop_dbg("PACKET IN: hdr size %d tlen %d data %p", header_size, tlen,
1564                   data);
1565
1566         trace_snoop_capture(ppd->dd, header_size, hdr, tlen - header_size,
1567                             data);
1568
1569         if (!ppd->dd->hfi1_snoop.filter_callback) {
1570                 snoop_dbg("filter not set");
1571                 ret = HFI1_FILTER_HIT;
1572         } else {
1573                 ret = ppd->dd->hfi1_snoop.filter_callback(hdr, data,
1574                                         ppd->dd->hfi1_snoop.filter_value);
1575         }
1576
1577         switch (ret) {
1578         case HFI1_FILTER_ERR:
1579                 snoop_dbg("Error in filter call");
1580                 break;
1581         case HFI1_FILTER_MISS:
1582                 snoop_dbg("Filter Miss");
1583                 break;
1584         case HFI1_FILTER_HIT:
1585
1586                 if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1587                         snoop_mode = 1;
1588                 if ((snoop_mode == 0) ||
1589                     unlikely(snoop_flags & SNOOP_USE_METADATA))
1590                         md_len = sizeof(struct capture_md);
1591
1592                 s_packet = allocate_snoop_packet(header_size,
1593                                                  tlen - header_size,
1594                                                  md_len);
1595
1596                 if (unlikely(!s_packet)) {
1597                         dd_dev_warn_ratelimited(ppd->dd, "Unable to allocate snoop/capture packet\n");
1598                         break;
1599                 }
1600
1601                 if (md_len > 0) {
1602                         memset(&md, 0, sizeof(struct capture_md));
1603                         md.port = 1;
1604                         md.dir = PKT_DIR_INGRESS;
1605                         md.u.rhf = packet->rhf;
1606                         memcpy(s_packet->data, &md, md_len);
1607                 }
1608
1609                 /* We should always have a header */
1610                 if (hdr) {
1611                         memcpy(s_packet->data + md_len, hdr, header_size);
1612                 } else {
1613                         dd_dev_err(ppd->dd, "Unable to copy header to snoop/capture packet\n");
1614                         kfree(s_packet);
1615                         break;
1616                 }
1617
1618                 /*
1619                  * Packets with no data are possible. If there is no data needed
1620                  * to take care of the last 4 bytes which are normally included
1621                  * with data buffers and are included in tlen.  Since we kzalloc
1622                  * the buffer we do not need to set any values but if we decide
1623                  * not to use kzalloc we should zero them.
1624                  */
1625                 if (data)
1626                         memcpy(s_packet->data + header_size + md_len, data,
1627                                tlen - header_size);
1628
1629                 s_packet->total_len = tlen + md_len;
1630                 snoop_list_add_tail(s_packet, ppd->dd);
1631
1632                 /*
1633                  * If we are snooping the packet not capturing then throw away
1634                  * after adding to the list.
1635                  */
1636                 snoop_dbg("Capturing packet");
1637                 if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) {
1638                         snoop_dbg("Throwing packet away");
1639                         /*
1640                          * If we are dropping the packet we still may need to
1641                          * handle the case where error flags are set, this is
1642                          * normally done by the type specific handler but that
1643                          * won't be called in this case.
1644                          */
1645                         if (unlikely(rhf_err_flags(packet->rhf)))
1646                                 handle_eflags(packet);
1647
1648                         /* throw the packet on the floor */
1649                         return RHF_RCV_CONTINUE;
1650                 }
1651                 break;
1652         default:
1653                 break;
1654         }
1655
1656         /*
1657          * We do not care what type of packet came in here - just pass it off
1658          * to the normal handler.
1659          */
1660         return ppd->dd->normal_rhf_rcv_functions[rhf_rcv_type(packet->rhf)]
1661                         (packet);
1662 }
1663
1664 /*
1665  * Handle snooping and capturing packets when sdma is being used.
1666  */
1667 int snoop_send_dma_handler(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
1668                            u64 pbc)
1669 {
1670         pr_alert("Snooping/Capture of Send DMA Packets Is Not Supported!\n");
1671         snoop_dbg("Unsupported Operation");
1672         return hfi1_verbs_send_dma(qp, ps, 0);
1673 }
1674
1675 /*
1676  * Handle snooping and capturing packets when pio is being used. Does not handle
1677  * bypass packets. The only way to send a bypass packet currently is to use the
1678  * diagpkt interface. When that interface is enable snoop/capture is not.
1679  */
1680 int snoop_send_pio_handler(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
1681                            u64 pbc)
1682 {
1683         u32 hdrwords = qp->s_hdrwords;
1684         struct rvt_sge_state *ss = qp->s_cur_sge;
1685         u32 len = qp->s_cur_size;
1686         u32 dwords = (len + 3) >> 2;
1687         u32 plen = hdrwords + dwords + 2; /* includes pbc */
1688         struct hfi1_pportdata *ppd = ps->ppd;
1689         struct snoop_packet *s_packet = NULL;
1690         u32 *hdr = (u32 *)&ps->s_txreq->phdr.hdr;
1691         u32 length = 0;
1692         struct rvt_sge_state temp_ss;
1693         void *data = NULL;
1694         void *data_start = NULL;
1695         int ret;
1696         int snoop_mode = 0;
1697         int md_len = 0;
1698         struct capture_md md;
1699         u32 vl;
1700         u32 hdr_len = hdrwords << 2;
1701         u32 tlen = HFI1_GET_PKT_LEN(&ps->s_txreq->phdr.hdr);
1702
1703         md.u.pbc = 0;
1704
1705         snoop_dbg("PACKET OUT: hdrword %u len %u plen %u dwords %u tlen %u",
1706                   hdrwords, len, plen, dwords, tlen);
1707         if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1708                 snoop_mode = 1;
1709         if ((snoop_mode == 0) ||
1710             unlikely(snoop_flags & SNOOP_USE_METADATA))
1711                 md_len = sizeof(struct capture_md);
1712
1713         /* not using ss->total_len as arg 2 b/c that does not count CRC */
1714         s_packet = allocate_snoop_packet(hdr_len, tlen - hdr_len, md_len);
1715
1716         if (unlikely(!s_packet)) {
1717                 dd_dev_warn_ratelimited(ppd->dd, "Unable to allocate snoop/capture packet\n");
1718                 goto out;
1719         }
1720
1721         s_packet->total_len = tlen + md_len;
1722
1723         if (md_len > 0) {
1724                 memset(&md, 0, sizeof(struct capture_md));
1725                 md.port = 1;
1726                 md.dir = PKT_DIR_EGRESS;
1727                 if (likely(pbc == 0)) {
1728                         vl = be16_to_cpu(ps->s_txreq->phdr.hdr.lrh[0]) >> 12;
1729                         md.u.pbc = create_pbc(ppd, 0, qp->s_srate, vl, plen);
1730                 } else {
1731                         md.u.pbc = 0;
1732                 }
1733                 memcpy(s_packet->data, &md, md_len);
1734         } else {
1735                 md.u.pbc = pbc;
1736         }
1737
1738         /* Copy header */
1739         if (likely(hdr)) {
1740                 memcpy(s_packet->data + md_len, hdr, hdr_len);
1741         } else {
1742                 dd_dev_err(ppd->dd,
1743                            "Unable to copy header to snoop/capture packet\n");
1744                 kfree(s_packet);
1745                 goto out;
1746         }
1747
1748         if (ss) {
1749                 data = s_packet->data + hdr_len + md_len;
1750                 data_start = data;
1751
1752                 /*
1753                  * Copy SGE State
1754                  * The update_sge() function below will not modify the
1755                  * individual SGEs in the array. It will make a copy each time
1756                  * and operate on that. So we only need to copy this instance
1757                  * and it won't impact PIO.
1758                  */
1759                 temp_ss = *ss;
1760                 length = len;
1761
1762                 snoop_dbg("Need to copy %d bytes", length);
1763                 while (length) {
1764                         void *addr = temp_ss.sge.vaddr;
1765                         u32 slen = temp_ss.sge.length;
1766
1767                         if (slen > length) {
1768                                 slen = length;
1769                                 snoop_dbg("slen %d > len %d", slen, length);
1770                         }
1771                         snoop_dbg("copy %d to %p", slen, addr);
1772                         memcpy(data, addr, slen);
1773                         update_sge(&temp_ss, slen);
1774                         length -= slen;
1775                         data += slen;
1776                         snoop_dbg("data is now %p bytes left %d", data, length);
1777                 }
1778                 snoop_dbg("Completed SGE copy");
1779         }
1780
1781         /*
1782          * Why do the filter check down here? Because the event tracing has its
1783          * own filtering and we need to have the walked the SGE list.
1784          */
1785         if (!ppd->dd->hfi1_snoop.filter_callback) {
1786                 snoop_dbg("filter not set\n");
1787                 ret = HFI1_FILTER_HIT;
1788         } else {
1789                 ret = ppd->dd->hfi1_snoop.filter_callback(
1790                                         &ps->s_txreq->phdr.hdr,
1791                                         NULL,
1792                                         ppd->dd->hfi1_snoop.filter_value);
1793         }
1794
1795         switch (ret) {
1796         case HFI1_FILTER_ERR:
1797                 snoop_dbg("Error in filter call");
1798                 /* fall through */
1799         case HFI1_FILTER_MISS:
1800                 snoop_dbg("Filter Miss");
1801                 kfree(s_packet);
1802                 break;
1803         case HFI1_FILTER_HIT:
1804                 snoop_dbg("Capturing packet");
1805                 snoop_list_add_tail(s_packet, ppd->dd);
1806
1807                 if (unlikely((snoop_flags & SNOOP_DROP_SEND) &&
1808                              (ppd->dd->hfi1_snoop.mode_flag &
1809                               HFI1_PORT_SNOOP_MODE))) {
1810                         unsigned long flags;
1811
1812                         snoop_dbg("Dropping packet");
1813                         if (qp->s_wqe) {
1814                                 spin_lock_irqsave(&qp->s_lock, flags);
1815                                 hfi1_send_complete(
1816                                         qp,
1817                                         qp->s_wqe,
1818                                         IB_WC_SUCCESS);
1819                                 spin_unlock_irqrestore(&qp->s_lock, flags);
1820                         } else if (qp->ibqp.qp_type == IB_QPT_RC) {
1821                                 spin_lock_irqsave(&qp->s_lock, flags);
1822                                 hfi1_rc_send_complete(qp,
1823                                                       &ps->s_txreq->phdr.hdr);
1824                                 spin_unlock_irqrestore(&qp->s_lock, flags);
1825                         }
1826
1827                         /*
1828                          * If snoop is dropping the packet we need to put the
1829                          * txreq back because no one else will.
1830                          */
1831                         hfi1_put_txreq(ps->s_txreq);
1832                         return 0;
1833                 }
1834                 break;
1835         default:
1836                 kfree(s_packet);
1837                 break;
1838         }
1839 out:
1840         return hfi1_verbs_send_pio(qp, ps, md.u.pbc);
1841 }
1842
1843 /*
1844  * Callers of this must pass a hfi1_ib_header type for the from ptr. Currently
1845  * this can be used anywhere, but the intention is for inline ACKs for RC and
1846  * CCA packets. We don't restrict this usage though.
1847  */
1848 void snoop_inline_pio_send(struct hfi1_devdata *dd, struct pio_buf *pbuf,
1849                            u64 pbc, const void *from, size_t count)
1850 {
1851         int snoop_mode = 0;
1852         int md_len = 0;
1853         struct capture_md md;
1854         struct snoop_packet *s_packet = NULL;
1855
1856         /*
1857          * count is in dwords so we need to convert to bytes.
1858          * We also need to account for CRC which would be tacked on by hardware.
1859          */
1860         int packet_len = (count << 2) + 4;
1861         int ret;
1862
1863         snoop_dbg("ACK OUT: len %d", packet_len);
1864
1865         if (!dd->hfi1_snoop.filter_callback) {
1866                 snoop_dbg("filter not set");
1867                 ret = HFI1_FILTER_HIT;
1868         } else {
1869                 ret = dd->hfi1_snoop.filter_callback(
1870                                 (struct hfi1_ib_header *)from,
1871                                 NULL,
1872                                 dd->hfi1_snoop.filter_value);
1873         }
1874
1875         switch (ret) {
1876         case HFI1_FILTER_ERR:
1877                 snoop_dbg("Error in filter call");
1878                 /* fall through */
1879         case HFI1_FILTER_MISS:
1880                 snoop_dbg("Filter Miss");
1881                 break;
1882         case HFI1_FILTER_HIT:
1883                 snoop_dbg("Capturing packet");
1884                 if (dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1885                         snoop_mode = 1;
1886                 if ((snoop_mode == 0) ||
1887                     unlikely(snoop_flags & SNOOP_USE_METADATA))
1888                         md_len = sizeof(struct capture_md);
1889
1890                 s_packet = allocate_snoop_packet(packet_len, 0, md_len);
1891
1892                 if (unlikely(!s_packet)) {
1893                         dd_dev_warn_ratelimited(dd, "Unable to allocate snoop/capture packet\n");
1894                         goto inline_pio_out;
1895                 }
1896
1897                 s_packet->total_len = packet_len + md_len;
1898
1899                 /* Fill in the metadata for the packet */
1900                 if (md_len > 0) {
1901                         memset(&md, 0, sizeof(struct capture_md));
1902                         md.port = 1;
1903                         md.dir = PKT_DIR_EGRESS;
1904                         md.u.pbc = pbc;
1905                         memcpy(s_packet->data, &md, md_len);
1906                 }
1907
1908                 /* Add the packet data which is a single buffer */
1909                 memcpy(s_packet->data + md_len, from, packet_len);
1910
1911                 snoop_list_add_tail(s_packet, dd);
1912
1913                 if (unlikely((snoop_flags & SNOOP_DROP_SEND) && snoop_mode)) {
1914                         snoop_dbg("Dropping packet");
1915                         return;
1916                 }
1917                 break;
1918         default:
1919                 break;
1920         }
1921
1922 inline_pio_out:
1923         pio_copy(dd, pbuf, pbc, from, count);
1924 }