drivers/staging/rdma/hfi1/diag.c

   1 /*
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2015 Intel Corporation.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * BSD LICENSE
  20  *
  21  * Copyright(c) 2015 Intel Corporation.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  *
  27  *  - Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  *  - Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in
  31  *    the documentation and/or other materials provided with the
  32  *    distribution.
  33  *  - Neither the name of Intel Corporation nor the names of its
  34  *    contributors may be used to endorse or promote products derived
  35  *    from this software without specific prior written permission.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  38  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  39  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  40  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  41  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  44  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  45  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  46  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  47  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  48  *
  49  */
  50
  51 /*
  52  * This file contains support for diagnostic functions.  It is accessed by
  53  * opening the hfi1_diag device, normally minor number 129.  Diagnostic use
  54  * of the chip may render the chip or board unusable until the driver
  55  * is unloaded, or in some cases, until the system is rebooted.
  56  *
  57  * Accesses to the chip through this interface are not similar to going
  58  * through the /sys/bus/pci resource mmap interface.
  59  */
  60
  61 #include <linux/io.h>
  62 #include <linux/pci.h>
  63 #include <linux/poll.h>
  64 #include <linux/vmalloc.h>
  65 #include <linux/export.h>
  66 #include <linux/fs.h>
  67 #include <linux/uaccess.h>
  68 #include <linux/module.h>
  69 #include <rdma/ib_smi.h>
  70 #include "hfi.h"
  71 #include "device.h"
  72 #include "common.h"
  73 #include "trace.h"
  74
  75 #undef pr_fmt
  76 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  77 #define snoop_dbg(fmt, ...) \
  78         hfi1_cdbg(SNOOP, fmt, ##__VA_ARGS__)
  79
  80 /* Snoop option mask */
  81 #define SNOOP_DROP_SEND         BIT(0)
  82 #define SNOOP_USE_METADATA      BIT(1)
  83
  84 static u8 snoop_flags;
  85
  86 /*
  87  * Extract packet length from LRH header.
  88  * Why & 0x7FF? Because len is only 11 bits in case it wasn't 0'd we throw the
  89  * bogus bits away. This is in Dwords so multiply by 4 to get size in bytes
  90  */
  91 #define HFI1_GET_PKT_LEN(x)      (((be16_to_cpu((x)->lrh[2]) & 0x7FF)) << 2)
  92
  93 enum hfi1_filter_status {
  94         HFI1_FILTER_HIT,
  95         HFI1_FILTER_ERR,
  96         HFI1_FILTER_MISS
  97 };
  98
  99 /* snoop processing functions */
 100 rhf_rcv_function_ptr snoop_rhf_rcv_functions[8] = {
 101         [RHF_RCV_TYPE_EXPECTED] = snoop_recv_handler,
 102         [RHF_RCV_TYPE_EAGER]    = snoop_recv_handler,
 103         [RHF_RCV_TYPE_IB]       = snoop_recv_handler,
 104         [RHF_RCV_TYPE_ERROR]    = snoop_recv_handler,
 105         [RHF_RCV_TYPE_BYPASS]   = snoop_recv_handler,
 106         [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
 107         [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
 108         [RHF_RCV_TYPE_INVALID7] = process_receive_invalid
 109 };
 110
 111 /* Snoop packet structure */
 112 struct snoop_packet {
 113         struct list_head list;
 114         u32 total_len;
 115         u8 data[];
 116 };
 117
 118 /* Do not make these an enum or it will blow up the capture_md */
 119 #define PKT_DIR_EGRESS 0x0
 120 #define PKT_DIR_INGRESS 0x1
 121
 122 /* Packet capture metadata returned to the user with the packet. */
 123 struct capture_md {
 124         u8 port;
 125         u8 dir;
 126         u8 reserved[6];
 127         union {
 128                 u64 pbc;
 129                 u64 rhf;
 130         } u;
 131 };
 132
 133 static atomic_t diagpkt_count = ATOMIC_INIT(0);
 134 static struct cdev diagpkt_cdev;
 135 static struct device *diagpkt_device;
 136
 137 static ssize_t diagpkt_write(struct file *fp, const char __user *data,
 138                              size_t count, loff_t *off);
 139
 140 static const struct file_operations diagpkt_file_ops = {
 141         .owner = THIS_MODULE,
 142         .write = diagpkt_write,
 143         .llseek = noop_llseek,
 144 };
 145
 146 /*
 147  * This is used for communication with user space for snoop extended IOCTLs
 148  */
 149 struct hfi1_link_info {
 150         __be64 node_guid;
 151         u8 port_mode;
 152         u8 port_state;
 153         u16 link_speed_active;
 154         u16 link_width_active;
 155         u16 vl15_init;
 156         u8 port_number;
 157         /*
 158          * Add padding to make this a full IB SMP payload. Note: changing the
 159          * size of this structure will make the IOCTLs created with _IOWR
 160          * change.
 161          * Be sure to run tests on all IOCTLs when making changes to this
 162          * structure.
 163          */
 164         u8 res[47];
 165 };
 166
 167 /*
 168  * This starts our ioctl sequence numbers *way* off from the ones
 169  * defined in ib_core.
 170  */
 171 #define SNOOP_CAPTURE_VERSION 0x1
 172
 173 #define IB_IOCTL_MAGIC          0x1b /* See Documentation/ioctl-number.txt */
 174 #define HFI1_SNOOP_IOC_MAGIC IB_IOCTL_MAGIC
 175 #define HFI1_SNOOP_IOC_BASE_SEQ 0x80
 176
 177 #define HFI1_SNOOP_IOCGETLINKSTATE \
 178         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ)
 179 #define HFI1_SNOOP_IOCSETLINKSTATE \
 180         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 1)
 181 #define HFI1_SNOOP_IOCCLEARQUEUE \
 182         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 2)
 183 #define HFI1_SNOOP_IOCCLEARFILTER \
 184         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 3)
 185 #define HFI1_SNOOP_IOCSETFILTER \
 186         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 4)
 187 #define HFI1_SNOOP_IOCGETVERSION \
 188         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 5)
 189 #define HFI1_SNOOP_IOCSET_OPTS \
 190         _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 6)
 191
 192 /*
 193  * These offsets +6/+7 could change, but these are already known and used
 194  * IOCTL numbers so don't change them without a good reason.
 195  */
 196 #define HFI1_SNOOP_IOCGETLINKSTATE_EXTRA \
 197         _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 6, \
 198                 struct hfi1_link_info)
 199 #define HFI1_SNOOP_IOCSETLINKSTATE_EXTRA \
 200         _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ + 7, \
 201                 struct hfi1_link_info)
 202
 203 static int hfi1_snoop_open(struct inode *in, struct file *fp);
 204 static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
 205                                size_t pkt_len, loff_t *off);
 206 static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
 207                                 size_t count, loff_t *off);
 208 static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);
 209 static unsigned int hfi1_snoop_poll(struct file *fp,
 210                                     struct poll_table_struct *wait);
 211 static int hfi1_snoop_release(struct inode *in, struct file *fp);
 212
 213 struct hfi1_packet_filter_command {
 214         int opcode;
 215         int length;
 216         void *value_ptr;
 217 };
 218
 219 /* Can't re-use PKT_DIR_*GRESS here because 0 means no packets for this */
 220 #define HFI1_SNOOP_INGRESS 0x1
 221 #define HFI1_SNOOP_EGRESS  0x2
 222
 223 enum hfi1_packet_filter_opcodes {
 224         FILTER_BY_LID,
 225         FILTER_BY_DLID,
 226         FILTER_BY_MAD_MGMT_CLASS,
 227         FILTER_BY_QP_NUMBER,
 228         FILTER_BY_PKT_TYPE,
 229         FILTER_BY_SERVICE_LEVEL,
 230         FILTER_BY_PKEY,
 231         FILTER_BY_DIRECTION,
 232 };
 233
 234 static const struct file_operations snoop_file_ops = {
 235         .owner = THIS_MODULE,
 236         .open = hfi1_snoop_open,
 237         .read = hfi1_snoop_read,
 238         .unlocked_ioctl = hfi1_ioctl,
 239         .poll = hfi1_snoop_poll,
 240         .write = hfi1_snoop_write,
 241         .release = hfi1_snoop_release
 242 };
 243
 244 struct hfi1_filter_array {
 245         int (*filter)(void *, void *, void *);
 246 };
 247
 248 static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value);
 249 static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value);
 250 static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
 251                                       void *value);
 252 static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value);
 253 static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
 254                                      void *value);
 255 static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
 256                                         void *value);
 257 static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value);
 258 static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value);
 259
 260 static struct hfi1_filter_array hfi1_filters[] = {
 261         { hfi1_filter_lid },
 262         { hfi1_filter_dlid },
 263         { hfi1_filter_mad_mgmt_class },
 264         { hfi1_filter_qp_number },
 265         { hfi1_filter_ibpacket_type },
 266         { hfi1_filter_ib_service_level },
 267         { hfi1_filter_ib_pkey },
 268         { hfi1_filter_direction },
 269 };
 270
 271 #define HFI1_MAX_FILTERS        ARRAY_SIZE(hfi1_filters)
 272 #define HFI1_DIAG_MINOR_BASE    129
 273
 274 static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name);
 275
 276 int hfi1_diag_add(struct hfi1_devdata *dd)
 277 {
 278         char name[16];
 279         int ret = 0;
 280
 281         snprintf(name, sizeof(name), "%s_diagpkt%d", class_name(),
 282                  dd->unit);
 283         /*
 284          * Do this for each device as opposed to the normal diagpkt
 285          * interface which is one per host
 286          */
 287         ret = hfi1_snoop_add(dd, name);
 288         if (ret)
 289                 dd_dev_err(dd, "Unable to init snoop/capture device");
 290
 291         snprintf(name, sizeof(name), "%s_diagpkt", class_name());
 292         if (atomic_inc_return(&diagpkt_count) == 1) {
 293                 ret = hfi1_cdev_init(HFI1_DIAGPKT_MINOR, name,
 294                                      &diagpkt_file_ops, &diagpkt_cdev,
 295                                      &diagpkt_device, false);
 296         }
 297
 298         return ret;
 299 }
 300
 301 /* this must be called w/ dd->snoop_in_lock held */
 302 static void drain_snoop_list(struct list_head *queue)
 303 {
 304         struct list_head *pos, *q;
 305         struct snoop_packet *packet;
 306
 307         list_for_each_safe(pos, q, queue) {
 308                 packet = list_entry(pos, struct snoop_packet, list);
 309                 list_del(pos);
 310                 kfree(packet);
 311         }
 312 }
 313
 314 static void hfi1_snoop_remove(struct hfi1_devdata *dd)
 315 {
 316         unsigned long flags = 0;
 317
 318         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 319         drain_snoop_list(&dd->hfi1_snoop.queue);
 320         hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev);
 321         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 322 }
 323
 324 void hfi1_diag_remove(struct hfi1_devdata *dd)
 325 {
 326         hfi1_snoop_remove(dd);
 327         if (atomic_dec_and_test(&diagpkt_count))
 328                 hfi1_cdev_cleanup(&diagpkt_cdev, &diagpkt_device);
 329         hfi1_cdev_cleanup(&dd->diag_cdev, &dd->diag_device);
 330 }
 331
 332 /*
 333  * Allocated structure shared between the credit return mechanism and
 334  * diagpkt_send().
 335  */
 336 struct diagpkt_wait {
 337         struct completion credits_returned;
 338         int code;
 339         atomic_t count;
 340 };
 341
 342 /*
 343  * When each side is finished with the structure, they call this.
 344  * The last user frees the structure.
 345  */
 346 static void put_diagpkt_wait(struct diagpkt_wait *wait)
 347 {
 348         if (atomic_dec_and_test(&wait->count))
 349                 kfree(wait);
 350 }
 351
 352 /*
 353  * Callback from the credit return code.  Set the complete, which
 354  * will let diapkt_send() continue.
 355  */
 356 static void diagpkt_complete(void *arg, int code)
 357 {
 358         struct diagpkt_wait *wait = (struct diagpkt_wait *)arg;
 359
 360         wait->code = code;
 361         complete(&wait->credits_returned);
 362         put_diagpkt_wait(wait); /* finished with the structure */
 363 }
 364
 365 /**
 366  * diagpkt_send - send a packet
 367  * @dp: diag packet descriptor
 368  */
 369 static ssize_t diagpkt_send(struct diag_pkt *dp)
 370 {
 371         struct hfi1_devdata *dd;
 372         struct send_context *sc;
 373         struct pio_buf *pbuf;
 374         u32 *tmpbuf = NULL;
 375         ssize_t ret = 0;
 376         u32 pkt_len, total_len;
 377         pio_release_cb credit_cb = NULL;
 378         void *credit_arg = NULL;
 379         struct diagpkt_wait *wait = NULL;
 380         int trycount = 0;
 381
 382         dd = hfi1_lookup(dp->unit);
 383         if (!dd || !(dd->flags & HFI1_PRESENT) || !dd->kregbase) {
 384                 ret = -ENODEV;
 385                 goto bail;
 386         }
 387         if (!(dd->flags & HFI1_INITTED)) {
 388                 /* no hardware, freeze, etc. */
 389                 ret = -ENODEV;
 390                 goto bail;
 391         }
 392
 393         if (dp->version != _DIAG_PKT_VERS) {
 394                 dd_dev_err(dd, "Invalid version %u for diagpkt_write\n",
 395                            dp->version);
 396                 ret = -EINVAL;
 397                 goto bail;
 398         }
 399
 400         /* send count must be an exact number of dwords */
 401         if (dp->len & 3) {
 402                 ret = -EINVAL;
 403                 goto bail;
 404         }
 405
 406         /* there is only port 1 */
 407         if (dp->port != 1) {
 408                 ret = -EINVAL;
 409                 goto bail;
 410         }
 411
 412         /* need a valid context */
 413         if (dp->sw_index >= dd->num_send_contexts) {
 414                 ret = -EINVAL;
 415                 goto bail;
 416         }
 417         /* can only use kernel contexts */
 418         if (dd->send_contexts[dp->sw_index].type != SC_KERNEL) {
 419                 ret = -EINVAL;
 420                 goto bail;
 421         }
 422         /* must be allocated */
 423         sc = dd->send_contexts[dp->sw_index].sc;
 424         if (!sc) {
 425                 ret = -EINVAL;
 426                 goto bail;
 427         }
 428         /* must be enabled */
 429         if (!(sc->flags & SCF_ENABLED)) {
 430                 ret = -EINVAL;
 431                 goto bail;
 432         }
 433
 434         /* allocate a buffer and copy the data in */
 435         tmpbuf = vmalloc(dp->len);
 436         if (!tmpbuf) {
 437                 ret = -ENOMEM;
 438                 goto bail;
 439         }
 440
 441         if (copy_from_user(tmpbuf,
 442                            (const void __user *)(unsigned long)dp->data,
 443                            dp->len)) {
 444                 ret = -EFAULT;
 445                 goto bail;
 446         }
 447
 448         /*
 449          * pkt_len is how much data we have to write, includes header and data.
 450          * total_len is length of the packet in Dwords plus the PBC should not
 451          * include the CRC.
 452          */
 453         pkt_len = dp->len >> 2;
 454         total_len = pkt_len + 2; /* PBC + packet */
 455
 456         /* if 0, fill in a default */
 457         if (dp->pbc == 0) {
 458                 struct hfi1_pportdata *ppd = dd->pport;
 459
 460                 hfi1_cdbg(PKT, "Generating PBC");
 461                 dp->pbc = create_pbc(ppd, 0, 0, 0, total_len);
 462         } else {
 463                 hfi1_cdbg(PKT, "Using passed in PBC");
 464         }
 465
 466         hfi1_cdbg(PKT, "Egress PBC content is 0x%llx", dp->pbc);
 467
 468         /*
 469          * The caller wants to wait until the packet is sent and to
 470          * check for errors.  The best we can do is wait until
 471          * the buffer credits are returned and check if any packet
 472          * error has occurred.  If there are any late errors, this
 473          * could miss it.  If there are other senders who generate
 474          * an error, this may find it.  However, in general, it
 475          * should catch most.
 476          */
 477         if (dp->flags & F_DIAGPKT_WAIT) {
 478                 /* always force a credit return */
 479                 dp->pbc |= PBC_CREDIT_RETURN;
 480                 /* turn on credit return interrupts */
 481                 sc_add_credit_return_intr(sc);
 482                 wait = kmalloc(sizeof(*wait), GFP_KERNEL);
 483                 if (!wait) {
 484                         ret = -ENOMEM;
 485                         goto bail;
 486                 }
 487                 init_completion(&wait->credits_returned);
 488                 atomic_set(&wait->count, 2);
 489                 wait->code = PRC_OK;
 490
 491                 credit_cb = diagpkt_complete;
 492                 credit_arg = wait;
 493         }
 494
 495 retry:
 496         pbuf = sc_buffer_alloc(sc, total_len, credit_cb, credit_arg);
 497         if (!pbuf) {
 498                 if (trycount == 0) {
 499                         /* force a credit return and try again */
 500                         sc_return_credits(sc);
 501                         trycount = 1;
 502                         goto retry;
 503                 }
 504                 /*
 505                  * No send buffer means no credit callback.  Undo
 506                  * the wait set-up that was done above.  We free wait
 507                  * because the callback will never be called.
 508                  */
 509                 if (dp->flags & F_DIAGPKT_WAIT) {
 510                         sc_del_credit_return_intr(sc);
 511                         kfree(wait);
 512                         wait = NULL;
 513                 }
 514                 ret = -ENOSPC;
 515                 goto bail;
 516         }
 517
 518         pio_copy(dd, pbuf, dp->pbc, tmpbuf, pkt_len);
 519         /* no flush needed as the HW knows the packet size */
 520
 521         ret = sizeof(*dp);
 522
 523         if (dp->flags & F_DIAGPKT_WAIT) {
 524                 /* wait for credit return */
 525                 ret = wait_for_completion_interruptible(
 526                                                 &wait->credits_returned);
 527                 /*
 528                  * If the wait returns an error, the wait was interrupted,
 529                  * e.g. with a ^C in the user program.  The callback is
 530                  * still pending.  This is OK as the wait structure is
 531                  * kmalloc'ed and the structure will free itself when
 532                  * all users are done with it.
 533                  *
 534                  * A context disable occurs on a send context restart, so
 535                  * include that in the list of errors below to check for.
 536                  * NOTE: PRC_FILL_ERR is at best informational and cannot
 537                  * be depended on.
 538                  */
 539                 if (!ret && (((wait->code & PRC_STATUS_ERR) ||
 540                               (wait->code & PRC_FILL_ERR) ||
 541                               (wait->code & PRC_SC_DISABLE))))
 542                         ret = -EIO;
 543
 544                 put_diagpkt_wait(wait); /* finished with the structure */
 545                 sc_del_credit_return_intr(sc);
 546         }
 547
 548 bail:
 549         vfree(tmpbuf);
 550         return ret;
 551 }
 552
 553 static ssize_t diagpkt_write(struct file *fp, const char __user *data,
 554                              size_t count, loff_t *off)
 555 {
 556         struct hfi1_devdata *dd;
 557         struct send_context *sc;
 558         u8 vl;
 559
 560         struct diag_pkt dp;
 561
 562         if (count != sizeof(dp))
 563                 return -EINVAL;
 564
 565         if (copy_from_user(&dp, data, sizeof(dp)))
 566                 return -EFAULT;
 567
 568         /*
 569         * The Send Context is derived from the PbcVL value
 570         * if PBC is populated
 571         */
 572         if (dp.pbc) {
 573                 dd = hfi1_lookup(dp.unit);
 574                 if (!dd)
 575                         return -ENODEV;
 576                 vl = (dp.pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
 577                 sc = dd->vld[vl].sc;
 578                 if (sc) {
 579                         dp.sw_index = sc->sw_index;
 580                         hfi1_cdbg(
 581                                PKT,
 582                                "Packet sent over VL %d via Send Context %u(%u)",
 583                                vl, sc->sw_index, sc->hw_context);
 584                 }
 585         }
 586
 587         return diagpkt_send(&dp);
 588 }
 589
 590 static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name)
 591 {
 592         int ret = 0;
 593
 594         dd->hfi1_snoop.mode_flag = 0;
 595         spin_lock_init(&dd->hfi1_snoop.snoop_lock);
 596         INIT_LIST_HEAD(&dd->hfi1_snoop.queue);
 597         init_waitqueue_head(&dd->hfi1_snoop.waitq);
 598
 599         ret = hfi1_cdev_init(HFI1_SNOOP_CAPTURE_BASE + dd->unit, name,
 600                              &snoop_file_ops,
 601                              &dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev,
 602                              false);
 603
 604         if (ret) {
 605                 dd_dev_err(dd, "Couldn't create %s device: %d", name, ret);
 606                 hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev,
 607                                   &dd->hfi1_snoop.class_dev);
 608         }
 609
 610         return ret;
 611 }
 612
 613 static struct hfi1_devdata *hfi1_dd_from_sc_inode(struct inode *in)
 614 {
 615         int unit = iminor(in) - HFI1_SNOOP_CAPTURE_BASE;
 616         struct hfi1_devdata *dd;
 617
 618         dd = hfi1_lookup(unit);
 619         return dd;
 620 }
 621
 622 /* clear or restore send context integrity checks */
 623 static void adjust_integrity_checks(struct hfi1_devdata *dd)
 624 {
 625         struct send_context *sc;
 626         unsigned long sc_flags;
 627         int i;
 628
 629         spin_lock_irqsave(&dd->sc_lock, sc_flags);
 630         for (i = 0; i < dd->num_send_contexts; i++) {
 631                 int enable;
 632
 633                 sc = dd->send_contexts[i].sc;
 634
 635                 if (!sc)
 636                         continue;       /* not allocated */
 637
 638                 enable = likely(!HFI1_CAP_IS_KSET(NO_INTEGRITY)) &&
 639                          dd->hfi1_snoop.mode_flag != HFI1_PORT_SNOOP_MODE;
 640
 641                 set_pio_integrity(sc);
 642
 643                 if (enable) /* take HFI_CAP_* flags into account */
 644                         hfi1_init_ctxt(sc);
 645         }
 646         spin_unlock_irqrestore(&dd->sc_lock, sc_flags);
 647 }
 648
 649 static int hfi1_snoop_open(struct inode *in, struct file *fp)
 650 {
 651         int ret;
 652         int mode_flag = 0;
 653         unsigned long flags = 0;
 654         struct hfi1_devdata *dd;
 655         struct list_head *queue;
 656
 657         mutex_lock(&hfi1_mutex);
 658
 659         dd = hfi1_dd_from_sc_inode(in);
 660         if (!dd) {
 661                 ret = -ENODEV;
 662                 goto bail;
 663         }
 664
 665         /*
 666          * File mode determines snoop or capture. Some existing user
 667          * applications expect the capture device to be able to be opened RDWR
 668          * because they expect a dedicated capture device. For this reason we
 669          * support a module param to force capture mode even if the file open
 670          * mode matches snoop.
 671          */
 672         if ((fp->f_flags & O_ACCMODE) == O_RDONLY) {
 673                 snoop_dbg("Capture Enabled");
 674                 mode_flag = HFI1_PORT_CAPTURE_MODE;
 675         } else if ((fp->f_flags & O_ACCMODE) == O_RDWR) {
 676                 snoop_dbg("Snoop Enabled");
 677                 mode_flag = HFI1_PORT_SNOOP_MODE;
 678         } else {
 679                 snoop_dbg("Invalid");
 680                 ret =  -EINVAL;
 681                 goto bail;
 682         }
 683         queue = &dd->hfi1_snoop.queue;
 684
 685         /*
 686          * We are not supporting snoop and capture at the same time.
 687          */
 688         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 689         if (dd->hfi1_snoop.mode_flag) {
 690                 ret = -EBUSY;
 691                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 692                 goto bail;
 693         }
 694
 695         dd->hfi1_snoop.mode_flag = mode_flag;
 696         drain_snoop_list(queue);
 697
 698         dd->hfi1_snoop.filter_callback = NULL;
 699         dd->hfi1_snoop.filter_value = NULL;
 700
 701         /*
 702          * Send side packet integrity checks are not helpful when snooping so
 703          * disable and re-enable when we stop snooping.
 704          */
 705         if (mode_flag == HFI1_PORT_SNOOP_MODE) {
 706                 /* clear after snoop mode is on */
 707                 adjust_integrity_checks(dd); /* clear */
 708
 709                 /*
 710                  * We also do not want to be doing the DLID LMC check for
 711                  * ingressed packets.
 712                  */
 713                 dd->hfi1_snoop.dcc_cfg = read_csr(dd, DCC_CFG_PORT_CONFIG1);
 714                 write_csr(dd, DCC_CFG_PORT_CONFIG1,
 715                           (dd->hfi1_snoop.dcc_cfg >> 32) << 32);
 716         }
 717
 718         /*
 719          * As soon as we set these function pointers the recv and send handlers
 720          * are active. This is a race condition so we must make sure to drain
 721          * the queue and init filter values above. Technically we should add
 722          * locking here but all that will happen is on recv a packet will get
 723          * allocated and get stuck on the snoop_lock before getting added to the
 724          * queue. Same goes for send.
 725          */
 726         dd->rhf_rcv_function_map = snoop_rhf_rcv_functions;
 727         dd->process_pio_send = snoop_send_pio_handler;
 728         dd->process_dma_send = snoop_send_pio_handler;
 729         dd->pio_inline_send = snoop_inline_pio_send;
 730
 731         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 732         ret = 0;
 733
 734 bail:
 735         mutex_unlock(&hfi1_mutex);
 736
 737         return ret;
 738 }
 739
 740 static int hfi1_snoop_release(struct inode *in, struct file *fp)
 741 {
 742         unsigned long flags = 0;
 743         struct hfi1_devdata *dd;
 744         int mode_flag;
 745
 746         dd = hfi1_dd_from_sc_inode(in);
 747         if (!dd)
 748                 return -ENODEV;
 749
 750         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 751
 752         /* clear the snoop mode before re-adjusting send context CSRs */
 753         mode_flag = dd->hfi1_snoop.mode_flag;
 754         dd->hfi1_snoop.mode_flag = 0;
 755
 756         /*
 757          * Drain the queue and clear the filters we are done with it. Don't
 758          * forget to restore the packet integrity checks
 759          */
 760         drain_snoop_list(&dd->hfi1_snoop.queue);
 761         if (mode_flag == HFI1_PORT_SNOOP_MODE) {
 762                 /* restore after snoop mode is clear */
 763                 adjust_integrity_checks(dd); /* restore */
 764
 765                 /*
 766                  * Also should probably reset the DCC_CONFIG1 register for DLID
 767                  * checking on incoming packets again. Use the value saved when
 768                  * opening the snoop device.
 769                  */
 770                 write_csr(dd, DCC_CFG_PORT_CONFIG1, dd->hfi1_snoop.dcc_cfg);
 771         }
 772
 773         dd->hfi1_snoop.filter_callback = NULL;
 774         kfree(dd->hfi1_snoop.filter_value);
 775         dd->hfi1_snoop.filter_value = NULL;
 776
 777         /*
 778          * User is done snooping and capturing, return control to the normal
 779          * handler. Re-enable SDMA handling.
 780          */
 781         dd->rhf_rcv_function_map = dd->normal_rhf_rcv_functions;
 782         dd->process_pio_send = hfi1_verbs_send_pio;
 783         dd->process_dma_send = hfi1_verbs_send_dma;
 784         dd->pio_inline_send = pio_copy;
 785
 786         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 787
 788         snoop_dbg("snoop/capture device released");
 789
 790         return 0;
 791 }
 792
 793 static unsigned int hfi1_snoop_poll(struct file *fp,
 794                                     struct poll_table_struct *wait)
 795 {
 796         int ret = 0;
 797         unsigned long flags = 0;
 798
 799         struct hfi1_devdata *dd;
 800
 801         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 802         if (!dd)
 803                 return -ENODEV;
 804
 805         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 806
 807         poll_wait(fp, &dd->hfi1_snoop.waitq, wait);
 808         if (!list_empty(&dd->hfi1_snoop.queue))
 809                 ret |= POLLIN | POLLRDNORM;
 810
 811         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 812         return ret;
 813 }
 814
 815 static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
 816                                 size_t count, loff_t *off)
 817 {
 818         struct diag_pkt dpkt;
 819         struct hfi1_devdata *dd;
 820         size_t ret;
 821         u8 byte_two, sl, sc5, sc4, vl, byte_one;
 822         struct send_context *sc;
 823         u32 len;
 824         u64 pbc;
 825         struct hfi1_ibport *ibp;
 826         struct hfi1_pportdata *ppd;
 827
 828         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 829         if (!dd)
 830                 return -ENODEV;
 831
 832         ppd = dd->pport;
 833         snoop_dbg("received %lu bytes from user", count);
 834
 835         memset(&dpkt, 0, sizeof(struct diag_pkt));
 836         dpkt.version = _DIAG_PKT_VERS;
 837         dpkt.unit = dd->unit;
 838         dpkt.port = 1;
 839
 840         if (likely(!(snoop_flags & SNOOP_USE_METADATA))) {
 841                 /*
 842                 * We need to generate the PBC and not let diagpkt_send do it,
 843                 * to do this we need the VL and the length in dwords.
 844                 * The VL can be determined by using the SL and looking up the
 845                 * SC. Then the SC can be converted into VL. The exception to
 846                 * this is those packets which are from an SMI queue pair.
 847                 * Since we can't detect anything about the QP here we have to
 848                 * rely on the SC. If its 0xF then we assume its SMI and
 849                 * do not look at the SL.
 850                 */
 851                 if (copy_from_user(&byte_one, data, 1))
 852                         return -EINVAL;
 853
 854                 if (copy_from_user(&byte_two, data + 1, 1))
 855                         return -EINVAL;
 856
 857                 sc4 = (byte_one >> 4) & 0xf;
 858                 if (sc4 == 0xF) {
 859                         snoop_dbg("Detected VL15 packet ignoring SL in packet");
 860                         vl = sc4;
 861                 } else {
 862                         sl = (byte_two >> 4) & 0xf;
 863                         ibp = to_iport(&dd->verbs_dev.ibdev, 1);
 864                         sc5 = ibp->sl_to_sc[sl];
 865                         vl = sc_to_vlt(dd, sc5);
 866                         if (vl != sc4) {
 867                                 snoop_dbg("VL %d does not match SC %d of packet",
 868                                           vl, sc4);
 869                                 return -EINVAL;
 870                         }
 871                 }
 872
 873                 sc = dd->vld[vl].sc; /* Look up the context based on VL */
 874                 if (sc) {
 875                         dpkt.sw_index = sc->sw_index;
 876                         snoop_dbg("Sending on context %u(%u)", sc->sw_index,
 877                                   sc->hw_context);
 878                 } else {
 879                         snoop_dbg("Could not find context for vl %d", vl);
 880                         return -EINVAL;
 881                 }
 882
 883                 len = (count >> 2) + 2; /* Add in PBC */
 884                 pbc = create_pbc(ppd, 0, 0, vl, len);
 885         } else {
 886                 if (copy_from_user(&pbc, data, sizeof(pbc)))
 887                         return -EINVAL;
 888                 vl = (pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
 889                 sc = dd->vld[vl].sc; /* Look up the context based on VL */
 890                 if (sc) {
 891                         dpkt.sw_index = sc->sw_index;
 892                 } else {
 893                         snoop_dbg("Could not find context for vl %d", vl);
 894                         return -EINVAL;
 895                 }
 896                 data += sizeof(pbc);
 897                 count -= sizeof(pbc);
 898         }
 899         dpkt.len = count;
 900         dpkt.data = (unsigned long)data;
 901
 902         snoop_dbg("PBC: vl=0x%llx Length=0x%llx",
 903                   (pbc >> 12) & 0xf,
 904                   (pbc & 0xfff));
 905
 906         dpkt.pbc = pbc;
 907         ret = diagpkt_send(&dpkt);
 908         /*
 909          * diagpkt_send only returns number of bytes in the diagpkt so patch
 910          * that up here before returning.
 911          */
 912         if (ret == sizeof(dpkt))
 913                 return count;
 914
 915         return ret;
 916 }
 917
 918 static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
 919                                size_t pkt_len, loff_t *off)
 920 {
 921         ssize_t ret = 0;
 922         unsigned long flags = 0;
 923         struct snoop_packet *packet = NULL;
 924         struct hfi1_devdata *dd;
 925
 926         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 927         if (!dd)
 928                 return -ENODEV;
 929
 930         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 931
 932         while (list_empty(&dd->hfi1_snoop.queue)) {
 933                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 934
 935                 if (fp->f_flags & O_NONBLOCK)
 936                         return -EAGAIN;
 937
 938                 if (wait_event_interruptible(
 939                                 dd->hfi1_snoop.waitq,
 940                                 !list_empty(&dd->hfi1_snoop.queue)))
 941                         return -EINTR;
 942
 943                 spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
 944         }
 945
 946         if (!list_empty(&dd->hfi1_snoop.queue)) {
 947                 packet = list_entry(dd->hfi1_snoop.queue.next,
 948                                     struct snoop_packet, list);
 949                 list_del(&packet->list);
 950                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 951                 if (pkt_len >= packet->total_len) {
 952                         if (copy_to_user(data, packet->data,
 953                                          packet->total_len))
 954                                 ret = -EFAULT;
 955                         else
 956                                 ret = packet->total_len;
 957                 } else {
 958                         ret = -EINVAL;
 959                 }
 960
 961                 kfree(packet);
 962         } else {
 963                 spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
 964         }
 965
 966         return ret;
 967 }
 968
 969 static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 970 {
 971         struct hfi1_devdata *dd;
 972         void *filter_value = NULL;
 973         long ret = 0;
 974         int value = 0;
 975         u8 phys_state = 0;
 976         u8 link_state = 0;
 977         u16 dev_state = 0;
 978         unsigned long flags = 0;
 979         unsigned long *argp = NULL;
 980         struct hfi1_packet_filter_command filter_cmd = {0};
 981         int mode_flag = 0;
 982         struct hfi1_pportdata *ppd = NULL;
 983         unsigned int index;
 984         struct hfi1_link_info link_info;
 985
 986         dd = hfi1_dd_from_sc_inode(fp->f_inode);
 987         if (!dd)
 988                 return -ENODEV;
 989
 990         mode_flag = dd->hfi1_snoop.mode_flag;
 991
 992         if (((_IOC_DIR(cmd) & _IOC_READ)
 993             && !access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd)))
 994             || ((_IOC_DIR(cmd) & _IOC_WRITE)
 995             && !access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd)))) {
 996                 return -EFAULT;
 997         } else if (!capable(CAP_SYS_ADMIN)) {
 998                 return -EPERM;
 999         } else if ((mode_flag & HFI1_PORT_CAPTURE_MODE) &&
1000                    (cmd != HFI1_SNOOP_IOCCLEARQUEUE) &&
1001                    (cmd != HFI1_SNOOP_IOCCLEARFILTER) &&
1002                    (cmd != HFI1_SNOOP_IOCSETFILTER)) {
1003                 /* Capture devices are allowed only 3 operations
1004                  * 1.Clear capture queue
1005                  * 2.Clear capture filter
1006                  * 3.Set capture filter
1007                  * Other are invalid.
1008                  */
1009                 return -EINVAL;
1010         }
1011
1012         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1013
1014         switch (cmd) {
1015         case HFI1_SNOOP_IOCSETLINKSTATE:
1016                 snoop_dbg("HFI1_SNOOP_IOCSETLINKSTATE is not valid");
1017                 ret = -EINVAL;
1018                 break;
1019
1020         case HFI1_SNOOP_IOCSETLINKSTATE_EXTRA:
1021                 memset(&link_info, 0, sizeof(link_info));
1022
1023                 if (copy_from_user(&link_info,
1024                                    (struct hfi1_link_info __user *)arg,
1025                                    sizeof(link_info)))
1026                         ret = -EFAULT;
1027
1028                 value = link_info.port_state;
1029                 index = link_info.port_number;
1030                 if (index > dd->num_pports - 1) {
1031                         ret = -EINVAL;
1032                         break;
1033                 }
1034
1035                 ppd = &dd->pport[index];
1036                 if (!ppd) {
1037                         ret = -EINVAL;
1038                         break;
1039                 }
1040
1041                 /* What we want to transition to */
1042                 phys_state = (value >> 4) & 0xF;
1043                 link_state = value & 0xF;
1044                 snoop_dbg("Setting link state 0x%x", value);
1045
1046                 switch (link_state) {
1047                 case IB_PORT_NOP:
1048                         if (phys_state == 0)
1049                                 break;
1050                                 /* fall through */
1051                 case IB_PORT_DOWN:
1052                         switch (phys_state) {
1053                         case 0:
1054                                 dev_state = HLS_DN_DOWNDEF;
1055                                 break;
1056                         case 2:
1057                                 dev_state = HLS_DN_POLL;
1058                                 break;
1059                         case 3:
1060                                 dev_state = HLS_DN_DISABLE;
1061                                 break;
1062                         default:
1063                                 ret = -EINVAL;
1064                                 goto done;
1065                         }
1066                         ret = set_link_state(ppd, dev_state);
1067                         break;
1068                 case IB_PORT_ARMED:
1069                         ret = set_link_state(ppd, HLS_UP_ARMED);
1070                         if (!ret)
1071                                 send_idle_sma(dd, SMA_IDLE_ARM);
1072                         break;
1073                 case IB_PORT_ACTIVE:
1074                         ret = set_link_state(ppd, HLS_UP_ACTIVE);
1075                         if (!ret)
1076                                 send_idle_sma(dd, SMA_IDLE_ACTIVE);
1077                         break;
1078                 default:
1079                         ret = -EINVAL;
1080                         break;
1081                 }
1082
1083                 if (ret)
1084                         break;
1085                 /* fall through */
1086         case HFI1_SNOOP_IOCGETLINKSTATE:
1087         case HFI1_SNOOP_IOCGETLINKSTATE_EXTRA:
1088                 if (cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) {
1089                         memset(&link_info, 0, sizeof(link_info));
1090                         if (copy_from_user(&link_info,
1091                                            (struct hfi1_link_info __user *)arg,
1092                                            sizeof(link_info)))
1093                                 ret = -EFAULT;
1094                         index = link_info.port_number;
1095                 } else {
1096                         ret = __get_user(index, (int __user *)arg);
1097                         if (ret !=  0)
1098                                 break;
1099                 }
1100
1101                 if (index > dd->num_pports - 1) {
1102                         ret = -EINVAL;
1103                         break;
1104                 }
1105
1106                 ppd = &dd->pport[index];
1107                 if (!ppd) {
1108                         ret = -EINVAL;
1109                         break;
1110                 }
1111                 value = hfi1_ibphys_portstate(ppd);
1112                 value <<= 4;
1113                 value |= driver_lstate(ppd);
1114
1115                 snoop_dbg("Link port | Link State: %d", value);
1116
1117                 if ((cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) ||
1118                     (cmd == HFI1_SNOOP_IOCSETLINKSTATE_EXTRA)) {
1119                         link_info.port_state = value;
1120                         link_info.node_guid = cpu_to_be64(ppd->guid);
1121                         link_info.link_speed_active =
1122                                                 ppd->link_speed_active;
1123                         link_info.link_width_active =
1124                                                 ppd->link_width_active;
1125                         if (copy_to_user((struct hfi1_link_info __user *)arg,
1126                                          &link_info, sizeof(link_info)))
1127                                 ret = -EFAULT;
1128                 } else {
1129                         ret = __put_user(value, (int __user *)arg);
1130                 }
1131                 break;
1132
1133         case HFI1_SNOOP_IOCCLEARQUEUE:
1134                 snoop_dbg("Clearing snoop queue");
1135                 drain_snoop_list(&dd->hfi1_snoop.queue);
1136                 break;
1137
1138         case HFI1_SNOOP_IOCCLEARFILTER:
1139                 snoop_dbg("Clearing filter");
1140                 if (dd->hfi1_snoop.filter_callback) {
1141                         /* Drain packets first */
1142                         drain_snoop_list(&dd->hfi1_snoop.queue);
1143                         dd->hfi1_snoop.filter_callback = NULL;
1144                 }
1145                 kfree(dd->hfi1_snoop.filter_value);
1146                 dd->hfi1_snoop.filter_value = NULL;
1147                 break;
1148
1149         case HFI1_SNOOP_IOCSETFILTER:
1150                 snoop_dbg("Setting filter");
1151                 /* just copy command structure */
1152                 argp = (unsigned long *)arg;
1153                 if (copy_from_user(&filter_cmd, (void __user *)argp,
1154                                    sizeof(filter_cmd))) {
1155                         ret = -EFAULT;
1156                         break;
1157                 }
1158                 if (filter_cmd.opcode >= HFI1_MAX_FILTERS) {
1159                         pr_alert("Invalid opcode in request\n");
1160                         ret = -EINVAL;
1161                         break;
1162                 }
1163
1164                 snoop_dbg("Opcode %d Len %d Ptr %p",
1165                           filter_cmd.opcode, filter_cmd.length,
1166                           filter_cmd.value_ptr);
1167
1168                 filter_value = kcalloc(filter_cmd.length, sizeof(u8),
1169                                        GFP_KERNEL);
1170                 if (!filter_value) {
1171                         ret = -ENOMEM;
1172                         break;
1173                 }
1174                 /* copy remaining data from userspace */
1175                 if (copy_from_user((u8 *)filter_value,
1176                                    (void __user *)filter_cmd.value_ptr,
1177                                    filter_cmd.length)) {
1178                         kfree(filter_value);
1179                         ret = -EFAULT;
1180                         break;
1181                 }
1182                 /* Drain packets first */
1183                 drain_snoop_list(&dd->hfi1_snoop.queue);
1184                 dd->hfi1_snoop.filter_callback =
1185                         hfi1_filters[filter_cmd.opcode].filter;
1186                 /* just in case we see back to back sets */
1187                 kfree(dd->hfi1_snoop.filter_value);
1188                 dd->hfi1_snoop.filter_value = filter_value;
1189
1190                 break;
1191         case HFI1_SNOOP_IOCGETVERSION:
1192                 value = SNOOP_CAPTURE_VERSION;
1193                 snoop_dbg("Getting version: %d", value);
1194                 ret = __put_user(value, (int __user *)arg);
1195                 break;
1196         case HFI1_SNOOP_IOCSET_OPTS:
1197                 snoop_flags = 0;
1198                 ret = __get_user(value, (int __user *)arg);
1199                 if (ret != 0)
1200                         break;
1201
1202                 snoop_dbg("Setting snoop option %d", value);
1203                 if (value & SNOOP_DROP_SEND)
1204                         snoop_flags |= SNOOP_DROP_SEND;
1205                 if (value & SNOOP_USE_METADATA)
1206                         snoop_flags |= SNOOP_USE_METADATA;
1207                 break;
1208         default:
1209                 ret = -ENOTTY;
1210                 break;
1211         }
1212 done:
1213         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1214         return ret;
1215 }
1216
1217 static void snoop_list_add_tail(struct snoop_packet *packet,
1218                                 struct hfi1_devdata *dd)
1219 {
1220         unsigned long flags = 0;
1221
1222         spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
1223         if (likely((dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) ||
1224                    (dd->hfi1_snoop.mode_flag & HFI1_PORT_CAPTURE_MODE))) {
1225                 list_add_tail(&packet->list, &dd->hfi1_snoop.queue);
1226                 snoop_dbg("Added packet to list");
1227         }
1228
1229         /*
1230          * Technically we can could have closed the snoop device while waiting
1231          * on the above lock and it is gone now. The snoop mode_flag will
1232          * prevent us from adding the packet to the queue though.
1233          */
1234
1235         spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
1236         wake_up_interruptible(&dd->hfi1_snoop.waitq);
1237 }
1238
1239 static inline int hfi1_filter_check(void *val, const char *msg)
1240 {
1241         if (!val) {
1242                 snoop_dbg("Error invalid %s value for filter", msg);
1243                 return HFI1_FILTER_ERR;
1244         }
1245         return 0;
1246 }
1247
1248 static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value)
1249 {
1250         struct hfi1_ib_header *hdr;
1251         int ret;
1252
1253         ret = hfi1_filter_check(ibhdr, "header");
1254         if (ret)
1255                 return ret;
1256         ret = hfi1_filter_check(value, "user");
1257         if (ret)
1258                 return ret;
1259         hdr = (struct hfi1_ib_header *)ibhdr;
1260
1261         if (*((u16 *)value) == be16_to_cpu(hdr->lrh[3])) /* matches slid */
1262                 return HFI1_FILTER_HIT; /* matched */
1263
1264         return HFI1_FILTER_MISS; /* Not matched */
1265 }
1266
1267 static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value)
1268 {
1269         struct hfi1_ib_header *hdr;
1270         int ret;
1271
1272         ret = hfi1_filter_check(ibhdr, "header");
1273         if (ret)
1274                 return ret;
1275         ret = hfi1_filter_check(value, "user");
1276         if (ret)
1277                 return ret;
1278
1279         hdr = (struct hfi1_ib_header *)ibhdr;
1280
1281         if (*((u16 *)value) == be16_to_cpu(hdr->lrh[1]))
1282                 return HFI1_FILTER_HIT;
1283
1284         return HFI1_FILTER_MISS;
1285 }
1286
1287 /* Not valid for outgoing packets, send handler passes null for data*/
1288 static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
1289                                       void *value)
1290 {
1291         struct hfi1_ib_header *hdr;
1292         struct hfi1_other_headers *ohdr = NULL;
1293         struct ib_smp *smp = NULL;
1294         u32 qpn = 0;
1295         int ret;
1296
1297         ret = hfi1_filter_check(ibhdr, "header");
1298         if (ret)
1299                 return ret;
1300         ret = hfi1_filter_check(packet_data, "packet_data");
1301         if (ret)
1302                 return ret;
1303         ret = hfi1_filter_check(value, "user");
1304         if (ret)
1305                 return ret;
1306
1307         hdr = (struct hfi1_ib_header *)ibhdr;
1308
1309         /* Check for GRH */
1310         if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
1311                 ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
1312         else
1313                 ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
1314
1315         qpn = be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF;
1316         if (qpn <= 1) {
1317                 smp = (struct ib_smp *)packet_data;
1318                 if (*((u8 *)value) == smp->mgmt_class)
1319                         return HFI1_FILTER_HIT;
1320                 else
1321                         return HFI1_FILTER_MISS;
1322         }
1323         return HFI1_FILTER_ERR;
1324 }
1325
1326 static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value)
1327 {
1328         struct hfi1_ib_header *hdr;
1329         struct hfi1_other_headers *ohdr = NULL;
1330         int ret;
1331
1332         ret = hfi1_filter_check(ibhdr, "header");
1333         if (ret)
1334                 return ret;
1335         ret = hfi1_filter_check(value, "user");
1336         if (ret)
1337                 return ret;
1338
1339         hdr = (struct hfi1_ib_header *)ibhdr;
1340
1341         /* Check for GRH */
1342         if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
1343                 ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
1344         else
1345                 ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
1346         if (*((u32 *)value) == (be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF))
1347                 return HFI1_FILTER_HIT;
1348
1349         return HFI1_FILTER_MISS;
1350 }
1351
1352 static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
1353                                      void *value)
1354 {
1355         u32 lnh = 0;
1356         u8 opcode = 0;
1357         struct hfi1_ib_header *hdr;
1358         struct hfi1_other_headers *ohdr = NULL;
1359         int ret;
1360
1361         ret = hfi1_filter_check(ibhdr, "header");
1362         if (ret)
1363                 return ret;
1364         ret = hfi1_filter_check(value, "user");
1365         if (ret)
1366                 return ret;
1367
1368         hdr = (struct hfi1_ib_header *)ibhdr;
1369
1370         lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
1371
1372         if (lnh == HFI1_LRH_BTH)
1373                 ohdr = &hdr->u.oth;
1374         else if (lnh == HFI1_LRH_GRH)
1375                 ohdr = &hdr->u.l.oth;
1376         else
1377                 return HFI1_FILTER_ERR;
1378
1379         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
1380
1381         if (*((u8 *)value) == ((opcode >> 5) & 0x7))
1382                 return HFI1_FILTER_HIT;
1383
1384         return HFI1_FILTER_MISS;
1385 }
1386
1387 static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
1388                                         void *value)
1389 {
1390         struct hfi1_ib_header *hdr;
1391         int ret;
1392
1393         ret = hfi1_filter_check(ibhdr, "header");
1394         if (ret)
1395                 return ret;
1396         ret = hfi1_filter_check(value, "user");
1397         if (ret)
1398                 return ret;
1399
1400         hdr = (struct hfi1_ib_header *)ibhdr;
1401
1402         if ((*((u8 *)value)) == ((be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF))
1403                 return HFI1_FILTER_HIT;
1404
1405         return HFI1_FILTER_MISS;
1406 }
1407
1408 static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value)
1409 {
1410         u32 lnh = 0;
1411         struct hfi1_ib_header *hdr;
1412         struct hfi1_other_headers *ohdr = NULL;
1413         int ret;
1414
1415         ret = hfi1_filter_check(ibhdr, "header");
1416         if (ret)
1417                 return ret;
1418         ret = hfi1_filter_check(value, "user");
1419         if (ret)
1420                 return ret;
1421
1422         hdr = (struct hfi1_ib_header *)ibhdr;
1423
1424         lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
1425         if (lnh == HFI1_LRH_BTH)
1426                 ohdr = &hdr->u.oth;
1427         else if (lnh == HFI1_LRH_GRH)
1428                 ohdr = &hdr->u.l.oth;
1429         else
1430                 return HFI1_FILTER_ERR;
1431
1432         /* P_key is 16-bit entity, however top most bit indicates
1433          * type of membership. 0 for limited and 1 for Full.
1434          * Limited members cannot accept information from other
1435          * Limited members, but communication is allowed between
1436          * every other combination of membership.
1437          * Hence we'll omit comparing top-most bit while filtering
1438          */
1439
1440         if ((*(u16 *)value & 0x7FFF) ==
1441                 ((be32_to_cpu(ohdr->bth[0])) & 0x7FFF))
1442                 return HFI1_FILTER_HIT;
1443
1444         return HFI1_FILTER_MISS;
1445 }
1446
1447 /*
1448  * If packet_data is NULL then this is coming from one of the send functions.
1449  * Thus we know if its an ingressed or egressed packet.
1450  */
1451 static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value)
1452 {
1453         u8 user_dir = *(u8 *)value;
1454         int ret;
1455
1456         ret = hfi1_filter_check(value, "user");
1457         if (ret)
1458                 return ret;
1459
1460         if (packet_data) {
1461                 /* Incoming packet */
1462                 if (user_dir & HFI1_SNOOP_INGRESS)
1463                         return HFI1_FILTER_HIT;
1464         } else {
1465                 /* Outgoing packet */
1466                 if (user_dir & HFI1_SNOOP_EGRESS)
1467                         return HFI1_FILTER_HIT;
1468         }
1469
1470         return HFI1_FILTER_MISS;
1471 }
1472
1473 /*
1474  * Allocate a snoop packet. The structure that is stored in the ring buffer, not
1475  * to be confused with an hfi packet type.
1476  */
1477 static struct snoop_packet *allocate_snoop_packet(u32 hdr_len,
1478                                                   u32 data_len,
1479                                                   u32 md_len)
1480 {
1481         struct snoop_packet *packet;
1482
1483         packet = kzalloc(sizeof(*packet) + hdr_len + data_len
1484                          + md_len,
1485                          GFP_ATOMIC | __GFP_NOWARN);
1486         if (likely(packet))
1487                 INIT_LIST_HEAD(&packet->list);
1488
1489         return packet;
1490 }
1491
1492 /*
1493  * Instead of having snoop and capture code intermixed with the recv functions,
1494  * both the interrupt handler and hfi1_ib_rcv() we are going to hijack the call
1495  * and land in here for snoop/capture but if not enabled the call will go
1496  * through as before. This gives us a single point to constrain all of the snoop
1497  * snoop recv logic. There is nothing special that needs to happen for bypass
1498  * packets. This routine should not try to look into the packet. It just copied
1499  * it. There is no guarantee for filters when it comes to bypass packets as
1500  * there is no specific support. Bottom line is this routine does now even know
1501  * what a bypass packet is.
1502  */
1503 int snoop_recv_handler(struct hfi1_packet *packet)
1504 {
1505         struct hfi1_pportdata *ppd = packet->rcd->ppd;
1506         struct hfi1_ib_header *hdr = packet->hdr;
1507         int header_size = packet->hlen;
1508         void *data = packet->ebuf;
1509         u32 tlen = packet->tlen;
1510         struct snoop_packet *s_packet = NULL;
1511         int ret;
1512         int snoop_mode = 0;
1513         u32 md_len = 0;
1514         struct capture_md md;
1515
1516         snoop_dbg("PACKET IN: hdr size %d tlen %d data %p", header_size, tlen,
1517                   data);
1518
1519         trace_snoop_capture(ppd->dd, header_size, hdr, tlen - header_size,
1520                             data);
1521
1522         if (!ppd->dd->hfi1_snoop.filter_callback) {
1523                 snoop_dbg("filter not set");
1524                 ret = HFI1_FILTER_HIT;
1525         } else {
1526                 ret = ppd->dd->hfi1_snoop.filter_callback(hdr, data,
1527                                         ppd->dd->hfi1_snoop.filter_value);
1528         }
1529
1530         switch (ret) {
1531         case HFI1_FILTER_ERR:
1532                 snoop_dbg("Error in filter call");
1533                 break;
1534         case HFI1_FILTER_MISS:
1535                 snoop_dbg("Filter Miss");
1536                 break;
1537         case HFI1_FILTER_HIT:
1538
1539                 if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1540                         snoop_mode = 1;
1541                 if ((snoop_mode == 0) ||
1542                     unlikely(snoop_flags & SNOOP_USE_METADATA))
1543                         md_len = sizeof(struct capture_md);
1544
1545                 s_packet = allocate_snoop_packet(header_size,
1546                                                  tlen - header_size,
1547                                                  md_len);
1548
1549                 if (unlikely(!s_packet)) {
1550                         dd_dev_warn_ratelimited(ppd->dd, "Unable to allocate snoop/capture packet\n");
1551                         break;
1552                 }
1553
1554                 if (md_len > 0) {
1555                         memset(&md, 0, sizeof(struct capture_md));
1556                         md.port = 1;
1557                         md.dir = PKT_DIR_INGRESS;
1558                         md.u.rhf = packet->rhf;
1559                         memcpy(s_packet->data, &md, md_len);
1560                 }
1561
1562                 /* We should always have a header */
1563                 if (hdr) {
1564                         memcpy(s_packet->data + md_len, hdr, header_size);
1565                 } else {
1566                         dd_dev_err(ppd->dd, "Unable to copy header to snoop/capture packet\n");
1567                         kfree(s_packet);
1568                         break;
1569                 }
1570
1571                 /*
1572                  * Packets with no data are possible. If there is no data needed
1573                  * to take care of the last 4 bytes which are normally included
1574                  * with data buffers and are included in tlen.  Since we kzalloc
1575                  * the buffer we do not need to set any values but if we decide
1576                  * not to use kzalloc we should zero them.
1577                  */
1578                 if (data)
1579                         memcpy(s_packet->data + header_size + md_len, data,
1580                                tlen - header_size);
1581
1582                 s_packet->total_len = tlen + md_len;
1583                 snoop_list_add_tail(s_packet, ppd->dd);
1584
1585                 /*
1586                  * If we are snooping the packet not capturing then throw away
1587                  * after adding to the list.
1588                  */
1589                 snoop_dbg("Capturing packet");
1590                 if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) {
1591                         snoop_dbg("Throwing packet away");
1592                         /*
1593                          * If we are dropping the packet we still may need to
1594                          * handle the case where error flags are set, this is
1595                          * normally done by the type specific handler but that
1596                          * won't be called in this case.
1597                          */
1598                         if (unlikely(rhf_err_flags(packet->rhf)))
1599                                 handle_eflags(packet);
1600
1601                         /* throw the packet on the floor */
1602                         return RHF_RCV_CONTINUE;
1603                 }
1604                 break;
1605         default:
1606                 break;
1607         }
1608
1609         /*
1610          * We do not care what type of packet came in here - just pass it off
1611          * to the normal handler.
1612          */
1613         return ppd->dd->normal_rhf_rcv_functions[rhf_rcv_type(packet->rhf)]
1614                         (packet);
1615 }
1616
1617 /*
1618  * Handle snooping and capturing packets when sdma is being used.
1619  */
1620 int snoop_send_dma_handler(struct hfi1_qp *qp, struct hfi1_pkt_state *ps,
1621                            u64 pbc)
1622 {
1623         pr_alert("Snooping/Capture of Send DMA Packets Is Not Supported!\n");
1624         snoop_dbg("Unsupported Operation");
1625         return hfi1_verbs_send_dma(qp, ps, 0);
1626 }
1627
1628 /*
1629  * Handle snooping and capturing packets when pio is being used. Does not handle
1630  * bypass packets. The only way to send a bypass packet currently is to use the
1631  * diagpkt interface. When that interface is enable snoop/capture is not.
1632  */
1633 int snoop_send_pio_handler(struct hfi1_qp *qp, struct hfi1_pkt_state *ps,
1634                            u64 pbc)
1635 {
1636         struct ahg_ib_header *ahdr = qp->s_hdr;
1637         u32 hdrwords = qp->s_hdrwords;
1638         struct hfi1_sge_state *ss = qp->s_cur_sge;
1639         u32 len = qp->s_cur_size;
1640         u32 dwords = (len + 3) >> 2;
1641         u32 plen = hdrwords + dwords + 2; /* includes pbc */
1642         struct hfi1_pportdata *ppd = ps->ppd;
1643         struct snoop_packet *s_packet = NULL;
1644         u32 *hdr = (u32 *)&ahdr->ibh;
1645         u32 length = 0;
1646         struct hfi1_sge_state temp_ss;
1647         void *data = NULL;
1648         void *data_start = NULL;
1649         int ret;
1650         int snoop_mode = 0;
1651         int md_len = 0;
1652         struct capture_md md;
1653         u32 vl;
1654         u32 hdr_len = hdrwords << 2;
1655         u32 tlen = HFI1_GET_PKT_LEN(&ahdr->ibh);
1656
1657         md.u.pbc = 0;
1658
1659         snoop_dbg("PACKET OUT: hdrword %u len %u plen %u dwords %u tlen %u",
1660                   hdrwords, len, plen, dwords, tlen);
1661         if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1662                 snoop_mode = 1;
1663         if ((snoop_mode == 0) ||
1664             unlikely(snoop_flags & SNOOP_USE_METADATA))
1665                 md_len = sizeof(struct capture_md);
1666
1667         /* not using ss->total_len as arg 2 b/c that does not count CRC */
1668         s_packet = allocate_snoop_packet(hdr_len, tlen - hdr_len, md_len);
1669
1670         if (unlikely(!s_packet)) {
1671                 dd_dev_warn_ratelimited(ppd->dd, "Unable to allocate snoop/capture packet\n");
1672                 goto out;
1673         }
1674
1675         s_packet->total_len = tlen + md_len;
1676
1677         if (md_len > 0) {
1678                 memset(&md, 0, sizeof(struct capture_md));
1679                 md.port = 1;
1680                 md.dir = PKT_DIR_EGRESS;
1681                 if (likely(pbc == 0)) {
1682                         vl = be16_to_cpu(ahdr->ibh.lrh[0]) >> 12;
1683                         md.u.pbc = create_pbc(ppd, 0, qp->s_srate, vl, plen);
1684                 } else {
1685                         md.u.pbc = 0;
1686                 }
1687                 memcpy(s_packet->data, &md, md_len);
1688         } else {
1689                 md.u.pbc = pbc;
1690         }
1691
1692         /* Copy header */
1693         if (likely(hdr)) {
1694                 memcpy(s_packet->data + md_len, hdr, hdr_len);
1695         } else {
1696                 dd_dev_err(ppd->dd,
1697                            "Unable to copy header to snoop/capture packet\n");
1698                 kfree(s_packet);
1699                 goto out;
1700         }
1701
1702         if (ss) {
1703                 data = s_packet->data + hdr_len + md_len;
1704                 data_start = data;
1705
1706                 /*
1707                  * Copy SGE State
1708                  * The update_sge() function below will not modify the
1709                  * individual SGEs in the array. It will make a copy each time
1710                  * and operate on that. So we only need to copy this instance
1711                  * and it won't impact PIO.
1712                  */
1713                 temp_ss = *ss;
1714                 length = len;
1715
1716                 snoop_dbg("Need to copy %d bytes", length);
1717                 while (length) {
1718                         void *addr = temp_ss.sge.vaddr;
1719                         u32 slen = temp_ss.sge.length;
1720
1721                         if (slen > length) {
1722                                 slen = length;
1723                                 snoop_dbg("slen %d > len %d", slen, length);
1724                         }
1725                         snoop_dbg("copy %d to %p", slen, addr);
1726                         memcpy(data, addr, slen);
1727                         update_sge(&temp_ss, slen);
1728                         length -= slen;
1729                         data += slen;
1730                         snoop_dbg("data is now %p bytes left %d", data, length);
1731                 }
1732                 snoop_dbg("Completed SGE copy");
1733         }
1734
1735         /*
1736          * Why do the filter check down here? Because the event tracing has its
1737          * own filtering and we need to have the walked the SGE list.
1738          */
1739         if (!ppd->dd->hfi1_snoop.filter_callback) {
1740                 snoop_dbg("filter not set\n");
1741                 ret = HFI1_FILTER_HIT;
1742         } else {
1743                 ret = ppd->dd->hfi1_snoop.filter_callback(
1744                                         &ahdr->ibh,
1745                                         NULL,
1746                                         ppd->dd->hfi1_snoop.filter_value);
1747         }
1748
1749         switch (ret) {
1750         case HFI1_FILTER_ERR:
1751                 snoop_dbg("Error in filter call");
1752                 /* fall through */
1753         case HFI1_FILTER_MISS:
1754                 snoop_dbg("Filter Miss");
1755                 kfree(s_packet);
1756                 break;
1757         case HFI1_FILTER_HIT:
1758                 snoop_dbg("Capturing packet");
1759                 snoop_list_add_tail(s_packet, ppd->dd);
1760
1761                 if (unlikely((snoop_flags & SNOOP_DROP_SEND) &&
1762                              (ppd->dd->hfi1_snoop.mode_flag &
1763                               HFI1_PORT_SNOOP_MODE))) {
1764                         unsigned long flags;
1765
1766                         snoop_dbg("Dropping packet");
1767                         if (qp->s_wqe) {
1768                                 spin_lock_irqsave(&qp->s_lock, flags);
1769                                 hfi1_send_complete(
1770                                         qp,
1771                                         qp->s_wqe,
1772                                         IB_WC_SUCCESS);
1773                                 spin_unlock_irqrestore(&qp->s_lock, flags);
1774                         } else if (qp->ibqp.qp_type == IB_QPT_RC) {
1775                                 spin_lock_irqsave(&qp->s_lock, flags);
1776                                 hfi1_rc_send_complete(qp, &ahdr->ibh);
1777                                 spin_unlock_irqrestore(&qp->s_lock, flags);
1778                         }
1779                         return 0;
1780                 }
1781                 break;
1782         default:
1783                 kfree(s_packet);
1784                 break;
1785         }
1786 out:
1787         return hfi1_verbs_send_pio(qp, ps, md.u.pbc);
1788 }
1789
1790 /*
1791  * Callers of this must pass a hfi1_ib_header type for the from ptr. Currently
1792  * this can be used anywhere, but the intention is for inline ACKs for RC and
1793  * CCA packets. We don't restrict this usage though.
1794  */
1795 void snoop_inline_pio_send(struct hfi1_devdata *dd, struct pio_buf *pbuf,
1796                            u64 pbc, const void *from, size_t count)
1797 {
1798         int snoop_mode = 0;
1799         int md_len = 0;
1800         struct capture_md md;
1801         struct snoop_packet *s_packet = NULL;
1802
1803         /*
1804          * count is in dwords so we need to convert to bytes.
1805          * We also need to account for CRC which would be tacked on by hardware.
1806          */
1807         int packet_len = (count << 2) + 4;
1808         int ret;
1809
1810         snoop_dbg("ACK OUT: len %d", packet_len);
1811
1812         if (!dd->hfi1_snoop.filter_callback) {
1813                 snoop_dbg("filter not set");
1814                 ret = HFI1_FILTER_HIT;
1815         } else {
1816                 ret = dd->hfi1_snoop.filter_callback(
1817                                 (struct hfi1_ib_header *)from,
1818                                 NULL,
1819                                 dd->hfi1_snoop.filter_value);
1820         }
1821
1822         switch (ret) {
1823         case HFI1_FILTER_ERR:
1824                 snoop_dbg("Error in filter call");
1825                 /* fall through */
1826         case HFI1_FILTER_MISS:
1827                 snoop_dbg("Filter Miss");
1828                 break;
1829         case HFI1_FILTER_HIT:
1830                 snoop_dbg("Capturing packet");
1831                 if (dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
1832                         snoop_mode = 1;
1833                 if ((snoop_mode == 0) ||
1834                     unlikely(snoop_flags & SNOOP_USE_METADATA))
1835                         md_len = sizeof(struct capture_md);
1836
1837                 s_packet = allocate_snoop_packet(packet_len, 0, md_len);
1838
1839                 if (unlikely(!s_packet)) {
1840                         dd_dev_warn_ratelimited(dd, "Unable to allocate snoop/capture packet\n");
1841                         goto inline_pio_out;
1842                 }
1843
1844                 s_packet->total_len = packet_len + md_len;
1845
1846                 /* Fill in the metadata for the packet */
1847                 if (md_len > 0) {
1848                         memset(&md, 0, sizeof(struct capture_md));
1849                         md.port = 1;
1850                         md.dir = PKT_DIR_EGRESS;
1851                         md.u.pbc = pbc;
1852                         memcpy(s_packet->data, &md, md_len);
1853                 }
1854
1855                 /* Add the packet data which is a single buffer */
1856                 memcpy(s_packet->data + md_len, from, packet_len);
1857
1858                 snoop_list_add_tail(s_packet, dd);
1859
1860                 if (unlikely((snoop_flags & SNOOP_DROP_SEND) && snoop_mode)) {
1861                         snoop_dbg("Dropping packet");
1862                         return;
1863                 }
1864                 break;
1865         default:
1866                 break;
1867         }
1868
1869 inline_pio_out:
1870         pio_copy(dd, pbuf, pbc, from, count);
1871 }