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+/*
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ * This file contains support for diagnostic functions. It is accessed by
+ * opening the hfi1_diag device, normally minor number 129. Diagnostic use
+ * of the chip may render the chip or board unusable until the driver
+ * is unloaded, or in some cases, until the system is rebooted.
+ *
+ * Accesses to the chip through this interface are not similar to going
+ * through the /sys/bus/pci resource mmap interface.
+ */
+
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/vmalloc.h>
+#include <linux/export.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <rdma/ib_smi.h>
+#include "hfi.h"
+#include "device.h"
+#include "common.h"
+#include "trace.h"
+
+#undef pr_fmt
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+#define snoop_dbg(fmt, ...) \
+ hfi1_cdbg(SNOOP, fmt, ##__VA_ARGS__)
+
+/* Snoop option mask */
+#define SNOOP_DROP_SEND (1 << 0)
+#define SNOOP_USE_METADATA (1 << 1)
+
+static u8 snoop_flags;
+
+/*
+ * Extract packet length from LRH header.
+ * Why & 0x7FF? Because len is only 11 bits in case it wasn't 0'd we throw the
+ * bogus bits away. This is in Dwords so multiply by 4 to get size in bytes
+ */
+#define HFI1_GET_PKT_LEN(x) (((be16_to_cpu((x)->lrh[2]) & 0x7FF)) << 2)
+
+enum hfi1_filter_status {
+ HFI1_FILTER_HIT,
+ HFI1_FILTER_ERR,
+ HFI1_FILTER_MISS
+};
+
+/* snoop processing functions */
+rhf_rcv_function_ptr snoop_rhf_rcv_functions[8] = {
+ [RHF_RCV_TYPE_EXPECTED] = snoop_recv_handler,
+ [RHF_RCV_TYPE_EAGER] = snoop_recv_handler,
+ [RHF_RCV_TYPE_IB] = snoop_recv_handler,
+ [RHF_RCV_TYPE_ERROR] = snoop_recv_handler,
+ [RHF_RCV_TYPE_BYPASS] = snoop_recv_handler,
+ [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
+ [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
+ [RHF_RCV_TYPE_INVALID7] = process_receive_invalid
+};
+
+/* Snoop packet structure */
+struct snoop_packet {
+ struct list_head list;
+ u32 total_len;
+ u8 data[];
+};
+
+/* Do not make these an enum or it will blow up the capture_md */
+#define PKT_DIR_EGRESS 0x0
+#define PKT_DIR_INGRESS 0x1
+
+/* Packet capture metadata returned to the user with the packet. */
+struct capture_md {
+ u8 port;
+ u8 dir;
+ u8 reserved[6];
+ union {
+ u64 pbc;
+ u64 rhf;
+ } u;
+};
+
+static atomic_t diagpkt_count = ATOMIC_INIT(0);
+static struct cdev diagpkt_cdev;
+static struct device *diagpkt_device;
+
+static ssize_t diagpkt_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off);
+
+static const struct file_operations diagpkt_file_ops = {
+ .owner = THIS_MODULE,
+ .write = diagpkt_write,
+ .llseek = noop_llseek,
+};
+
+/*
+ * This is used for communication with user space for snoop extended IOCTLs
+ */
+struct hfi1_link_info {
+ __be64 node_guid;
+ u8 port_mode;
+ u8 port_state;
+ u16 link_speed_active;
+ u16 link_width_active;
+ u16 vl15_init;
+ u8 port_number;
+ /*
+ * Add padding to make this a full IB SMP payload. Note: changing the
+ * size of this structure will make the IOCTLs created with _IOWR
+ * change.
+ * Be sure to run tests on all IOCTLs when making changes to this
+ * structure.
+ */
+ u8 res[47];
+};
+
+/*
+ * This starts our ioctl sequence numbers *way* off from the ones
+ * defined in ib_core.
+ */
+#define SNOOP_CAPTURE_VERSION 0x1
+
+#define IB_IOCTL_MAGIC 0x1b /* See Documentation/ioctl-number.txt */
+#define HFI1_SNOOP_IOC_MAGIC IB_IOCTL_MAGIC
+#define HFI1_SNOOP_IOC_BASE_SEQ 0x80
+
+#define HFI1_SNOOP_IOCGETLINKSTATE \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ)
+#define HFI1_SNOOP_IOCSETLINKSTATE \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+1)
+#define HFI1_SNOOP_IOCCLEARQUEUE \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+2)
+#define HFI1_SNOOP_IOCCLEARFILTER \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+3)
+#define HFI1_SNOOP_IOCSETFILTER \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+4)
+#define HFI1_SNOOP_IOCGETVERSION \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+5)
+#define HFI1_SNOOP_IOCSET_OPTS \
+ _IO(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+6)
+
+/*
+ * These offsets +6/+7 could change, but these are already known and used
+ * IOCTL numbers so don't change them without a good reason.
+ */
+#define HFI1_SNOOP_IOCGETLINKSTATE_EXTRA \
+ _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+6, \
+ struct hfi1_link_info)
+#define HFI1_SNOOP_IOCSETLINKSTATE_EXTRA \
+ _IOWR(HFI1_SNOOP_IOC_MAGIC, HFI1_SNOOP_IOC_BASE_SEQ+7, \
+ struct hfi1_link_info)
+
+static int hfi1_snoop_open(struct inode *in, struct file *fp);
+static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
+ size_t pkt_len, loff_t *off);
+static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off);
+static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);
+static unsigned int hfi1_snoop_poll(struct file *fp,
+ struct poll_table_struct *wait);
+static int hfi1_snoop_release(struct inode *in, struct file *fp);
+
+struct hfi1_packet_filter_command {
+ int opcode;
+ int length;
+ void *value_ptr;
+};
+
+/* Can't re-use PKT_DIR_*GRESS here because 0 means no packets for this */
+#define HFI1_SNOOP_INGRESS 0x1
+#define HFI1_SNOOP_EGRESS 0x2
+
+enum hfi1_packet_filter_opcodes {
+ FILTER_BY_LID,
+ FILTER_BY_DLID,
+ FILTER_BY_MAD_MGMT_CLASS,
+ FILTER_BY_QP_NUMBER,
+ FILTER_BY_PKT_TYPE,
+ FILTER_BY_SERVICE_LEVEL,
+ FILTER_BY_PKEY,
+ FILTER_BY_DIRECTION,
+};
+
+static const struct file_operations snoop_file_ops = {
+ .owner = THIS_MODULE,
+ .open = hfi1_snoop_open,
+ .read = hfi1_snoop_read,
+ .unlocked_ioctl = hfi1_ioctl,
+ .poll = hfi1_snoop_poll,
+ .write = hfi1_snoop_write,
+ .release = hfi1_snoop_release
+};
+
+struct hfi1_filter_array {
+ int (*filter)(void *, void *, void *);
+};
+
+static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value);
+static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value);
+static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
+ void *value);
+static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value);
+static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
+ void *value);
+static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
+ void *value);
+static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value);
+static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value);
+
+static struct hfi1_filter_array hfi1_filters[] = {
+ { hfi1_filter_lid },
+ { hfi1_filter_dlid },
+ { hfi1_filter_mad_mgmt_class },
+ { hfi1_filter_qp_number },
+ { hfi1_filter_ibpacket_type },
+ { hfi1_filter_ib_service_level },
+ { hfi1_filter_ib_pkey },
+ { hfi1_filter_direction },
+};
+
+#define HFI1_MAX_FILTERS ARRAY_SIZE(hfi1_filters)
+#define HFI1_DIAG_MINOR_BASE 129
+
+static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name);
+
+int hfi1_diag_add(struct hfi1_devdata *dd)
+{
+ char name[16];
+ int ret = 0;
+
+ snprintf(name, sizeof(name), "%s_diagpkt%d", class_name(),
+ dd->unit);
+ /*
+ * Do this for each device as opposed to the normal diagpkt
+ * interface which is one per host
+ */
+ ret = hfi1_snoop_add(dd, name);
+ if (ret)
+ dd_dev_err(dd, "Unable to init snoop/capture device");
+
+ snprintf(name, sizeof(name), "%s_diagpkt", class_name());
+ if (atomic_inc_return(&diagpkt_count) == 1) {
+ ret = hfi1_cdev_init(HFI1_DIAGPKT_MINOR, name,
+ &diagpkt_file_ops, &diagpkt_cdev,
+ &diagpkt_device);
+ }
+
+ return ret;
+}
+
+/* this must be called w/ dd->snoop_in_lock held */
+static void drain_snoop_list(struct list_head *queue)
+{
+ struct list_head *pos, *q;
+ struct snoop_packet *packet;
+
+ list_for_each_safe(pos, q, queue) {
+ packet = list_entry(pos, struct snoop_packet, list);
+ list_del(pos);
+ kfree(packet);
+ }
+}
+
+static void hfi1_snoop_remove(struct hfi1_devdata *dd)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+ drain_snoop_list(&dd->hfi1_snoop.queue);
+ hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev);
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+}
+
+void hfi1_diag_remove(struct hfi1_devdata *dd)
+{
+
+ hfi1_snoop_remove(dd);
+ if (atomic_dec_and_test(&diagpkt_count))
+ hfi1_cdev_cleanup(&diagpkt_cdev, &diagpkt_device);
+ hfi1_cdev_cleanup(&dd->diag_cdev, &dd->diag_device);
+}
+
+
+/*
+ * Allocated structure shared between the credit return mechanism and
+ * diagpkt_send().
+ */
+struct diagpkt_wait {
+ struct completion credits_returned;
+ int code;
+ atomic_t count;
+};
+
+/*
+ * When each side is finished with the structure, they call this.
+ * The last user frees the structure.
+ */
+static void put_diagpkt_wait(struct diagpkt_wait *wait)
+{
+ if (atomic_dec_and_test(&wait->count))
+ kfree(wait);
+}
+
+/*
+ * Callback from the credit return code. Set the complete, which
+ * will let diapkt_send() continue.
+ */
+static void diagpkt_complete(void *arg, int code)
+{
+ struct diagpkt_wait *wait = (struct diagpkt_wait *)arg;
+
+ wait->code = code;
+ complete(&wait->credits_returned);
+ put_diagpkt_wait(wait); /* finished with the structure */
+}
+
+/**
+ * diagpkt_send - send a packet
+ * @dp: diag packet descriptor
+ */
+static ssize_t diagpkt_send(struct diag_pkt *dp)
+{
+ struct hfi1_devdata *dd;
+ struct send_context *sc;
+ struct pio_buf *pbuf;
+ u32 *tmpbuf = NULL;
+ ssize_t ret = 0;
+ u32 pkt_len, total_len;
+ pio_release_cb credit_cb = NULL;
+ void *credit_arg = NULL;
+ struct diagpkt_wait *wait = NULL;
+
+ dd = hfi1_lookup(dp->unit);
+ if (!dd || !(dd->flags & HFI1_PRESENT) || !dd->kregbase) {
+ ret = -ENODEV;
+ goto bail;
+ }
+ if (!(dd->flags & HFI1_INITTED)) {
+ /* no hardware, freeze, etc. */
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ if (dp->version != _DIAG_PKT_VERS) {
+ dd_dev_err(dd, "Invalid version %u for diagpkt_write\n",
+ dp->version);
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ /* send count must be an exact number of dwords */
+ if (dp->len & 3) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ /* there is only port 1 */
+ if (dp->port != 1) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ /* need a valid context */
+ if (dp->sw_index >= dd->num_send_contexts) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ /* can only use kernel contexts */
+ if (dd->send_contexts[dp->sw_index].type != SC_KERNEL) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ /* must be allocated */
+ sc = dd->send_contexts[dp->sw_index].sc;
+ if (!sc) {
+ ret = -EINVAL;
+ goto bail;
+ }
+ /* must be enabled */
+ if (!(sc->flags & SCF_ENABLED)) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ /* allocate a buffer and copy the data in */
+ tmpbuf = vmalloc(dp->len);
+ if (!tmpbuf) {
+ ret = -ENOMEM;
+ goto bail;
+ }
+
+ if (copy_from_user(tmpbuf,
+ (const void __user *) (unsigned long) dp->data,
+ dp->len)) {
+ ret = -EFAULT;
+ goto bail;
+ }
+
+ /*
+ * pkt_len is how much data we have to write, includes header and data.
+ * total_len is length of the packet in Dwords plus the PBC should not
+ * include the CRC.
+ */
+ pkt_len = dp->len >> 2;
+ total_len = pkt_len + 2; /* PBC + packet */
+
+ /* if 0, fill in a default */
+ if (dp->pbc == 0) {
+ struct hfi1_pportdata *ppd = dd->pport;
+
+ hfi1_cdbg(PKT, "Generating PBC");
+ dp->pbc = create_pbc(ppd, 0, 0, 0, total_len);
+ } else {
+ hfi1_cdbg(PKT, "Using passed in PBC");
+ }
+
+ hfi1_cdbg(PKT, "Egress PBC content is 0x%llx", dp->pbc);
+
+ /*
+ * The caller wants to wait until the packet is sent and to
+ * check for errors. The best we can do is wait until
+ * the buffer credits are returned and check if any packet
+ * error has occurred. If there are any late errors, this
+ * could miss it. If there are other senders who generate
+ * an error, this may find it. However, in general, it
+ * should catch most.
+ */
+ if (dp->flags & F_DIAGPKT_WAIT) {
+ /* always force a credit return */
+ dp->pbc |= PBC_CREDIT_RETURN;
+ /* turn on credit return interrupts */
+ sc_add_credit_return_intr(sc);
+ wait = kmalloc(sizeof(*wait), GFP_KERNEL);
+ if (!wait) {
+ ret = -ENOMEM;
+ goto bail;
+ }
+ init_completion(&wait->credits_returned);
+ atomic_set(&wait->count, 2);
+ wait->code = PRC_OK;
+
+ credit_cb = diagpkt_complete;
+ credit_arg = wait;
+ }
+
+ pbuf = sc_buffer_alloc(sc, total_len, credit_cb, credit_arg);
+ if (!pbuf) {
+ /*
+ * No send buffer means no credit callback. Undo
+ * the wait set-up that was done above. We free wait
+ * because the callback will never be called.
+ */
+ if (dp->flags & F_DIAGPKT_WAIT) {
+ sc_del_credit_return_intr(sc);
+ kfree(wait);
+ wait = NULL;
+ }
+ ret = -ENOSPC;
+ goto bail;
+ }
+
+ pio_copy(dd, pbuf, dp->pbc, tmpbuf, pkt_len);
+ /* no flush needed as the HW knows the packet size */
+
+ ret = sizeof(*dp);
+
+ if (dp->flags & F_DIAGPKT_WAIT) {
+ /* wait for credit return */
+ ret = wait_for_completion_interruptible(
+ &wait->credits_returned);
+ /*
+ * If the wait returns an error, the wait was interrupted,
+ * e.g. with a ^C in the user program. The callback is
+ * still pending. This is OK as the wait structure is
+ * kmalloc'ed and the structure will free itself when
+ * all users are done with it.
+ *
+ * A context disable occurs on a send context restart, so
+ * include that in the list of errors below to check for.
+ * NOTE: PRC_FILL_ERR is at best informational and cannot
+ * be depended on.
+ */
+ if (!ret && (((wait->code & PRC_STATUS_ERR)
+ || (wait->code & PRC_FILL_ERR)
+ || (wait->code & PRC_SC_DISABLE))))
+ ret = -EIO;
+
+ put_diagpkt_wait(wait); /* finished with the structure */
+ sc_del_credit_return_intr(sc);
+ }
+
+bail:
+ vfree(tmpbuf);
+ return ret;
+}
+
+static ssize_t diagpkt_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off)
+{
+ struct hfi1_devdata *dd;
+ struct send_context *sc;
+ u8 vl;
+
+ struct diag_pkt dp;
+
+ if (count != sizeof(dp))
+ return -EINVAL;
+
+ if (copy_from_user(&dp, data, sizeof(dp)))
+ return -EFAULT;
+
+ /*
+ * The Send Context is derived from the PbcVL value
+ * if PBC is populated
+ */
+ if (dp.pbc) {
+ dd = hfi1_lookup(dp.unit);
+ if (dd == NULL)
+ return -ENODEV;
+ vl = (dp.pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
+ sc = dd->vld[vl].sc;
+ if (sc) {
+ dp.sw_index = sc->sw_index;
+ hfi1_cdbg(
+ PKT,
+ "Packet sent over VL %d via Send Context %u(%u)",
+ vl, sc->sw_index, sc->hw_context);
+ }
+ }
+
+ return diagpkt_send(&dp);
+}
+
+static int hfi1_snoop_add(struct hfi1_devdata *dd, const char *name)
+{
+ int ret = 0;
+
+ dd->hfi1_snoop.mode_flag = 0;
+ spin_lock_init(&dd->hfi1_snoop.snoop_lock);
+ INIT_LIST_HEAD(&dd->hfi1_snoop.queue);
+ init_waitqueue_head(&dd->hfi1_snoop.waitq);
+
+ ret = hfi1_cdev_init(HFI1_SNOOP_CAPTURE_BASE + dd->unit, name,
+ &snoop_file_ops,
+ &dd->hfi1_snoop.cdev, &dd->hfi1_snoop.class_dev);
+
+ if (ret) {
+ dd_dev_err(dd, "Couldn't create %s device: %d", name, ret);
+ hfi1_cdev_cleanup(&dd->hfi1_snoop.cdev,
+ &dd->hfi1_snoop.class_dev);
+ }
+
+ return ret;
+}
+
+static struct hfi1_devdata *hfi1_dd_from_sc_inode(struct inode *in)
+{
+ int unit = iminor(in) - HFI1_SNOOP_CAPTURE_BASE;
+ struct hfi1_devdata *dd = NULL;
+
+ dd = hfi1_lookup(unit);
+ return dd;
+
+}
+
+/* clear or restore send context integrity checks */
+static void adjust_integrity_checks(struct hfi1_devdata *dd)
+{
+ struct send_context *sc;
+ unsigned long sc_flags;
+ int i;
+
+ spin_lock_irqsave(&dd->sc_lock, sc_flags);
+ for (i = 0; i < dd->num_send_contexts; i++) {
+ int enable;
+
+ sc = dd->send_contexts[i].sc;
+
+ if (!sc)
+ continue; /* not allocated */
+
+ enable = likely(!HFI1_CAP_IS_KSET(NO_INTEGRITY)) &&
+ dd->hfi1_snoop.mode_flag != HFI1_PORT_SNOOP_MODE;
+
+ set_pio_integrity(sc);
+
+ if (enable) /* take HFI_CAP_* flags into account */
+ hfi1_init_ctxt(sc);
+ }
+ spin_unlock_irqrestore(&dd->sc_lock, sc_flags);
+}
+
+static int hfi1_snoop_open(struct inode *in, struct file *fp)
+{
+ int ret;
+ int mode_flag = 0;
+ unsigned long flags = 0;
+ struct hfi1_devdata *dd;
+ struct list_head *queue;
+
+ mutex_lock(&hfi1_mutex);
+
+ dd = hfi1_dd_from_sc_inode(in);
+ if (dd == NULL) {
+ ret = -ENODEV;
+ goto bail;
+ }
+
+ /*
+ * File mode determines snoop or capture. Some existing user
+ * applications expect the capture device to be able to be opened RDWR
+ * because they expect a dedicated capture device. For this reason we
+ * support a module param to force capture mode even if the file open
+ * mode matches snoop.
+ */
+ if ((fp->f_flags & O_ACCMODE) == O_RDONLY) {
+ snoop_dbg("Capture Enabled");
+ mode_flag = HFI1_PORT_CAPTURE_MODE;
+ } else if ((fp->f_flags & O_ACCMODE) == O_RDWR) {
+ snoop_dbg("Snoop Enabled");
+ mode_flag = HFI1_PORT_SNOOP_MODE;
+ } else {
+ snoop_dbg("Invalid");
+ ret = -EINVAL;
+ goto bail;
+ }
+ queue = &dd->hfi1_snoop.queue;
+
+ /*
+ * We are not supporting snoop and capture at the same time.
+ */
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+ if (dd->hfi1_snoop.mode_flag) {
+ ret = -EBUSY;
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ goto bail;
+ }
+
+ dd->hfi1_snoop.mode_flag = mode_flag;
+ drain_snoop_list(queue);
+
+ dd->hfi1_snoop.filter_callback = NULL;
+ dd->hfi1_snoop.filter_value = NULL;
+
+ /*
+ * Send side packet integrity checks are not helpful when snooping so
+ * disable and re-enable when we stop snooping.
+ */
+ if (mode_flag == HFI1_PORT_SNOOP_MODE) {
+ /* clear after snoop mode is on */
+ adjust_integrity_checks(dd); /* clear */
+
+ /*
+ * We also do not want to be doing the DLID LMC check for
+ * ingressed packets.
+ */
+ dd->hfi1_snoop.dcc_cfg = read_csr(dd, DCC_CFG_PORT_CONFIG1);
+ write_csr(dd, DCC_CFG_PORT_CONFIG1,
+ (dd->hfi1_snoop.dcc_cfg >> 32) << 32);
+ }
+
+ /*
+ * As soon as we set these function pointers the recv and send handlers
+ * are active. This is a race condition so we must make sure to drain
+ * the queue and init filter values above. Technically we should add
+ * locking here but all that will happen is on recv a packet will get
+ * allocated and get stuck on the snoop_lock before getting added to the
+ * queue. Same goes for send.
+ */
+ dd->rhf_rcv_function_map = snoop_rhf_rcv_functions;
+ dd->process_pio_send = snoop_send_pio_handler;
+ dd->process_dma_send = snoop_send_pio_handler;
+ dd->pio_inline_send = snoop_inline_pio_send;
+
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ ret = 0;
+
+bail:
+ mutex_unlock(&hfi1_mutex);
+
+ return ret;
+}
+
+static int hfi1_snoop_release(struct inode *in, struct file *fp)
+{
+ unsigned long flags = 0;
+ struct hfi1_devdata *dd;
+ int mode_flag;
+
+ dd = hfi1_dd_from_sc_inode(in);
+ if (dd == NULL)
+ return -ENODEV;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+
+ /* clear the snoop mode before re-adjusting send context CSRs */
+ mode_flag = dd->hfi1_snoop.mode_flag;
+ dd->hfi1_snoop.mode_flag = 0;
+
+ /*
+ * Drain the queue and clear the filters we are done with it. Don't
+ * forget to restore the packet integrity checks
+ */
+ drain_snoop_list(&dd->hfi1_snoop.queue);
+ if (mode_flag == HFI1_PORT_SNOOP_MODE) {
+ /* restore after snoop mode is clear */
+ adjust_integrity_checks(dd); /* restore */
+
+ /*
+ * Also should probably reset the DCC_CONFIG1 register for DLID
+ * checking on incoming packets again. Use the value saved when
+ * opening the snoop device.
+ */
+ write_csr(dd, DCC_CFG_PORT_CONFIG1, dd->hfi1_snoop.dcc_cfg);
+ }
+
+ dd->hfi1_snoop.filter_callback = NULL;
+ kfree(dd->hfi1_snoop.filter_value);
+ dd->hfi1_snoop.filter_value = NULL;
+
+ /*
+ * User is done snooping and capturing, return control to the normal
+ * handler. Re-enable SDMA handling.
+ */
+ dd->rhf_rcv_function_map = dd->normal_rhf_rcv_functions;
+ dd->process_pio_send = hfi1_verbs_send_pio;
+ dd->process_dma_send = hfi1_verbs_send_dma;
+ dd->pio_inline_send = pio_copy;
+
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+
+ snoop_dbg("snoop/capture device released");
+
+ return 0;
+}
+
+static unsigned int hfi1_snoop_poll(struct file *fp,
+ struct poll_table_struct *wait)
+{
+ int ret = 0;
+ unsigned long flags = 0;
+
+ struct hfi1_devdata *dd;
+
+ dd = hfi1_dd_from_sc_inode(fp->f_inode);
+ if (dd == NULL)
+ return -ENODEV;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+
+ poll_wait(fp, &dd->hfi1_snoop.waitq, wait);
+ if (!list_empty(&dd->hfi1_snoop.queue))
+ ret |= POLLIN | POLLRDNORM;
+
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ return ret;
+
+}
+
+static ssize_t hfi1_snoop_write(struct file *fp, const char __user *data,
+ size_t count, loff_t *off)
+{
+ struct diag_pkt dpkt;
+ struct hfi1_devdata *dd;
+ size_t ret;
+ u8 byte_two, sl, sc5, sc4, vl, byte_one;
+ struct send_context *sc;
+ u32 len;
+ u64 pbc;
+ struct hfi1_ibport *ibp;
+ struct hfi1_pportdata *ppd;
+
+ dd = hfi1_dd_from_sc_inode(fp->f_inode);
+ if (dd == NULL)
+ return -ENODEV;
+
+ ppd = dd->pport;
+ snoop_dbg("received %lu bytes from user", count);
+
+ memset(&dpkt, 0, sizeof(struct diag_pkt));
+ dpkt.version = _DIAG_PKT_VERS;
+ dpkt.unit = dd->unit;
+ dpkt.port = 1;
+
+ if (likely(!(snoop_flags & SNOOP_USE_METADATA))) {
+ /*
+ * We need to generate the PBC and not let diagpkt_send do it,
+ * to do this we need the VL and the length in dwords.
+ * The VL can be determined by using the SL and looking up the
+ * SC. Then the SC can be converted into VL. The exception to
+ * this is those packets which are from an SMI queue pair.
+ * Since we can't detect anything about the QP here we have to
+ * rely on the SC. If its 0xF then we assume its SMI and
+ * do not look at the SL.
+ */
+ if (copy_from_user(&byte_one, data, 1))
+ return -EINVAL;
+
+ if (copy_from_user(&byte_two, data+1, 1))
+ return -EINVAL;
+
+ sc4 = (byte_one >> 4) & 0xf;
+ if (sc4 == 0xF) {
+ snoop_dbg("Detected VL15 packet ignoring SL in packet");
+ vl = sc4;
+ } else {
+ sl = (byte_two >> 4) & 0xf;
+ ibp = to_iport(&dd->verbs_dev.ibdev, 1);
+ sc5 = ibp->sl_to_sc[sl];
+ vl = sc_to_vlt(dd, sc5);
+ if (vl != sc4) {
+ snoop_dbg("VL %d does not match SC %d of packet",
+ vl, sc4);
+ return -EINVAL;
+ }
+ }
+
+ sc = dd->vld[vl].sc; /* Look up the context based on VL */
+ if (sc) {
+ dpkt.sw_index = sc->sw_index;
+ snoop_dbg("Sending on context %u(%u)", sc->sw_index,
+ sc->hw_context);
+ } else {
+ snoop_dbg("Could not find context for vl %d", vl);
+ return -EINVAL;
+ }
+
+ len = (count >> 2) + 2; /* Add in PBC */
+ pbc = create_pbc(ppd, 0, 0, vl, len);
+ } else {
+ if (copy_from_user(&pbc, data, sizeof(pbc)))
+ return -EINVAL;
+ vl = (pbc >> PBC_VL_SHIFT) & PBC_VL_MASK;
+ sc = dd->vld[vl].sc; /* Look up the context based on VL */
+ if (sc) {
+ dpkt.sw_index = sc->sw_index;
+ } else {
+ snoop_dbg("Could not find context for vl %d", vl);
+ return -EINVAL;
+ }
+ data += sizeof(pbc);
+ count -= sizeof(pbc);
+ }
+ dpkt.len = count;
+ dpkt.data = (unsigned long)data;
+
+ len = (count >> 2) + 2; /* Add in PBC */
+ pbc = create_pbc(ppd, 0, 0, vl, len);
+ snoop_dbg("PBC: vl=0x%llx Length=0x%llx",
+ (pbc >> 12) & 0xf,
+ (pbc & 0xfff));
+
+ dpkt.pbc = pbc;
+ ret = diagpkt_send(&dpkt);
+ /*
+ * diagpkt_send only returns number of bytes in the diagpkt so patch
+ * that up here before returning.
+ */
+ if (ret == sizeof(dpkt))
+ return count;
+
+ return ret;
+}
+
+static ssize_t hfi1_snoop_read(struct file *fp, char __user *data,
+ size_t pkt_len, loff_t *off)
+{
+ ssize_t ret = 0;
+ unsigned long flags = 0;
+ struct snoop_packet *packet = NULL;
+ struct hfi1_devdata *dd;
+
+ dd = hfi1_dd_from_sc_inode(fp->f_inode);
+ if (dd == NULL)
+ return -ENODEV;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+
+ while (list_empty(&dd->hfi1_snoop.queue)) {
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+
+ if (fp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ if (wait_event_interruptible(
+ dd->hfi1_snoop.waitq,
+ !list_empty(&dd->hfi1_snoop.queue)))
+ return -EINTR;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+ }
+
+ if (!list_empty(&dd->hfi1_snoop.queue)) {
+ packet = list_entry(dd->hfi1_snoop.queue.next,
+ struct snoop_packet, list);
+ list_del(&packet->list);
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ if (pkt_len >= packet->total_len) {
+ if (copy_to_user(data, packet->data,
+ packet->total_len))
+ ret = -EFAULT;
+ else
+ ret = packet->total_len;
+ } else
+ ret = -EINVAL;
+
+ kfree(packet);
+ } else
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+
+ return ret;
+}
+
+static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+ struct hfi1_devdata *dd;
+ void *filter_value = NULL;
+ long ret = 0;
+ int value = 0;
+ u8 physState = 0;
+ u8 linkState = 0;
+ u16 devState = 0;
+ unsigned long flags = 0;
+ unsigned long *argp = NULL;
+ struct hfi1_packet_filter_command filter_cmd = {0};
+ int mode_flag = 0;
+ struct hfi1_pportdata *ppd = NULL;
+ unsigned int index;
+ struct hfi1_link_info link_info;
+
+ dd = hfi1_dd_from_sc_inode(fp->f_inode);
+ if (dd == NULL)
+ return -ENODEV;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+
+ mode_flag = dd->hfi1_snoop.mode_flag;
+
+ if (((_IOC_DIR(cmd) & _IOC_READ)
+ && !access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd)))
+ || ((_IOC_DIR(cmd) & _IOC_WRITE)
+ && !access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd)))) {
+ ret = -EFAULT;
+ } else if (!capable(CAP_SYS_ADMIN)) {
+ ret = -EPERM;
+ } else if ((mode_flag & HFI1_PORT_CAPTURE_MODE) &&
+ (cmd != HFI1_SNOOP_IOCCLEARQUEUE) &&
+ (cmd != HFI1_SNOOP_IOCCLEARFILTER) &&
+ (cmd != HFI1_SNOOP_IOCSETFILTER)) {
+ /* Capture devices are allowed only 3 operations
+ * 1.Clear capture queue
+ * 2.Clear capture filter
+ * 3.Set capture filter
+ * Other are invalid.
+ */
+ ret = -EINVAL;
+ } else {
+ switch (cmd) {
+ case HFI1_SNOOP_IOCSETLINKSTATE:
+ snoop_dbg("HFI1_SNOOP_IOCSETLINKSTATE is not valid");
+ ret = -EINVAL;
+ break;
+
+ case HFI1_SNOOP_IOCSETLINKSTATE_EXTRA:
+ memset(&link_info, 0, sizeof(link_info));
+
+ ret = copy_from_user(&link_info,
+ (struct hfi1_link_info __user *)arg,
+ sizeof(link_info));
+ if (ret)
+ break;
+
+ value = link_info.port_state;
+ index = link_info.port_number;
+ if (index > dd->num_pports - 1) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ppd = &dd->pport[index];
+ if (!ppd) {
+ ret = -EINVAL;
+ break;
+ }
+
+ /* What we want to transition to */
+ physState = (value >> 4) & 0xF;
+ linkState = value & 0xF;
+ snoop_dbg("Setting link state 0x%x", value);
+
+ switch (linkState) {
+ case IB_PORT_NOP:
+ if (physState == 0)
+ break;
+ /* fall through */
+ case IB_PORT_DOWN:
+ switch (physState) {
+ case 0:
+ devState = HLS_DN_DOWNDEF;
+ break;
+ case 2:
+ devState = HLS_DN_POLL;
+ break;
+ case 3:
+ devState = HLS_DN_DISABLE;
+ break;
+ default:
+ ret = -EINVAL;
+ goto done;
+ }
+ ret = set_link_state(ppd, devState);
+ break;
+ case IB_PORT_ARMED:
+ ret = set_link_state(ppd, HLS_UP_ARMED);
+ if (!ret)
+ send_idle_sma(dd, SMA_IDLE_ARM);
+ break;
+ case IB_PORT_ACTIVE:
+ ret = set_link_state(ppd, HLS_UP_ACTIVE);
+ if (!ret)
+ send_idle_sma(dd, SMA_IDLE_ACTIVE);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if (ret)
+ break;
+ /* fall through */
+ case HFI1_SNOOP_IOCGETLINKSTATE:
+ case HFI1_SNOOP_IOCGETLINKSTATE_EXTRA:
+ if (cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) {
+ memset(&link_info, 0, sizeof(link_info));
+ ret = copy_from_user(&link_info,
+ (struct hfi1_link_info __user *)arg,
+ sizeof(link_info));
+ index = link_info.port_number;
+ } else {
+ ret = __get_user(index, (int __user *) arg);
+ if (ret != 0)
+ break;
+ }
+
+ if (index > dd->num_pports - 1) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ppd = &dd->pport[index];
+ if (!ppd) {
+ ret = -EINVAL;
+ break;
+ }
+ value = hfi1_ibphys_portstate(ppd);
+ value <<= 4;
+ value |= driver_lstate(ppd);
+
+ snoop_dbg("Link port | Link State: %d", value);
+
+ if ((cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) ||
+ (cmd == HFI1_SNOOP_IOCSETLINKSTATE_EXTRA)) {
+ link_info.port_state = value;
+ link_info.node_guid = ppd->guid;
+ link_info.link_speed_active =
+ ppd->link_speed_active;
+ link_info.link_width_active =
+ ppd->link_width_active;
+ ret = copy_to_user(
+ (struct hfi1_link_info __user *)arg,
+ &link_info, sizeof(link_info));
+ } else {
+ ret = __put_user(value, (int __user *)arg);
+ }
+ break;
+
+ case HFI1_SNOOP_IOCCLEARQUEUE:
+ snoop_dbg("Clearing snoop queue");
+ drain_snoop_list(&dd->hfi1_snoop.queue);
+ break;
+
+ case HFI1_SNOOP_IOCCLEARFILTER:
+ snoop_dbg("Clearing filter");
+ if (dd->hfi1_snoop.filter_callback) {
+ /* Drain packets first */
+ drain_snoop_list(&dd->hfi1_snoop.queue);
+ dd->hfi1_snoop.filter_callback = NULL;
+ }
+ kfree(dd->hfi1_snoop.filter_value);
+ dd->hfi1_snoop.filter_value = NULL;
+ break;
+
+ case HFI1_SNOOP_IOCSETFILTER:
+ snoop_dbg("Setting filter");
+ /* just copy command structure */
+ argp = (unsigned long *)arg;
+ ret = copy_from_user(&filter_cmd, (void __user *)argp,
+ sizeof(filter_cmd));
+ if (ret < 0) {
+ pr_alert("Error copying filter command\n");
+ break;
+ }
+ if (filter_cmd.opcode >= HFI1_MAX_FILTERS) {
+ pr_alert("Invalid opcode in request\n");
+ ret = -EINVAL;
+ break;
+ }
+
+ snoop_dbg("Opcode %d Len %d Ptr %p",
+ filter_cmd.opcode, filter_cmd.length,
+ filter_cmd.value_ptr);
+
+ filter_value = kzalloc(
+ filter_cmd.length * sizeof(u8),
+ GFP_KERNEL);
+ if (!filter_value) {
+ pr_alert("Not enough memory\n");
+ ret = -ENOMEM;
+ break;
+ }
+ /* copy remaining data from userspace */
+ ret = copy_from_user((u8 *)filter_value,
+ (void __user *)filter_cmd.value_ptr,
+ filter_cmd.length);
+ if (ret < 0) {
+ kfree(filter_value);
+ pr_alert("Error copying filter data\n");
+ break;
+ }
+ /* Drain packets first */
+ drain_snoop_list(&dd->hfi1_snoop.queue);
+ dd->hfi1_snoop.filter_callback =
+ hfi1_filters[filter_cmd.opcode].filter;
+ /* just in case we see back to back sets */
+ kfree(dd->hfi1_snoop.filter_value);
+ dd->hfi1_snoop.filter_value = filter_value;
+
+ break;
+ case HFI1_SNOOP_IOCGETVERSION:
+ value = SNOOP_CAPTURE_VERSION;
+ snoop_dbg("Getting version: %d", value);
+ ret = __put_user(value, (int __user *)arg);
+ break;
+ case HFI1_SNOOP_IOCSET_OPTS:
+ snoop_flags = 0;
+ ret = __get_user(value, (int __user *) arg);
+ if (ret != 0)
+ break;
+
+ snoop_dbg("Setting snoop option %d", value);
+ if (value & SNOOP_DROP_SEND)
+ snoop_flags |= SNOOP_DROP_SEND;
+ if (value & SNOOP_USE_METADATA)
+ snoop_flags |= SNOOP_USE_METADATA;
+ break;
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+ }
+done:
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ return ret;
+}
+
+static void snoop_list_add_tail(struct snoop_packet *packet,
+ struct hfi1_devdata *dd)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags);
+ if (likely((dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) ||
+ (dd->hfi1_snoop.mode_flag & HFI1_PORT_CAPTURE_MODE))) {
+ list_add_tail(&packet->list, &dd->hfi1_snoop.queue);
+ snoop_dbg("Added packet to list");
+ }
+
+ /*
+ * Technically we can could have closed the snoop device while waiting
+ * on the above lock and it is gone now. The snoop mode_flag will
+ * prevent us from adding the packet to the queue though.
+ */
+
+ spin_unlock_irqrestore(&dd->hfi1_snoop.snoop_lock, flags);
+ wake_up_interruptible(&dd->hfi1_snoop.waitq);
+}
+
+static inline int hfi1_filter_check(void *val, const char *msg)
+{
+ if (!val) {
+ snoop_dbg("Error invalid %s value for filter", msg);
+ return HFI1_FILTER_ERR;
+ }
+ return 0;
+}
+
+static int hfi1_filter_lid(void *ibhdr, void *packet_data, void *value)
+{
+ struct hfi1_ib_header *hdr;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ if (*((u16 *)value) == be16_to_cpu(hdr->lrh[3])) /* matches slid */
+ return HFI1_FILTER_HIT; /* matched */
+
+ return HFI1_FILTER_MISS; /* Not matched */
+}
+
+static int hfi1_filter_dlid(void *ibhdr, void *packet_data, void *value)
+{
+ struct hfi1_ib_header *hdr;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ if (*((u16 *)value) == be16_to_cpu(hdr->lrh[1]))
+ return HFI1_FILTER_HIT;
+
+ return HFI1_FILTER_MISS;
+}
+
+/* Not valid for outgoing packets, send handler passes null for data*/
+static int hfi1_filter_mad_mgmt_class(void *ibhdr, void *packet_data,
+ void *value)
+{
+ struct hfi1_ib_header *hdr;
+ struct hfi1_other_headers *ohdr = NULL;
+ struct ib_smp *smp = NULL;
+ u32 qpn = 0;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(packet_data, "packet_data");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ /* Check for GRH */
+ if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
+ ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
+ else
+ ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
+
+ qpn = be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF;
+ if (qpn <= 1) {
+ smp = (struct ib_smp *)packet_data;
+ if (*((u8 *)value) == smp->mgmt_class)
+ return HFI1_FILTER_HIT;
+ else
+ return HFI1_FILTER_MISS;
+ }
+ return HFI1_FILTER_ERR;
+}
+
+static int hfi1_filter_qp_number(void *ibhdr, void *packet_data, void *value)
+{
+
+ struct hfi1_ib_header *hdr;
+ struct hfi1_other_headers *ohdr = NULL;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ /* Check for GRH */
+ if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH)
+ ohdr = &hdr->u.oth; /* LRH + BTH + DETH */
+ else
+ ohdr = &hdr->u.l.oth; /* LRH + GRH + BTH + DETH */
+ if (*((u32 *)value) == (be32_to_cpu(ohdr->bth[1]) & 0x00FFFFFF))
+ return HFI1_FILTER_HIT;
+
+ return HFI1_FILTER_MISS;
+}
+
+static int hfi1_filter_ibpacket_type(void *ibhdr, void *packet_data,
+ void *value)
+{
+ u32 lnh = 0;
+ u8 opcode = 0;
+ struct hfi1_ib_header *hdr;
+ struct hfi1_other_headers *ohdr = NULL;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
+
+ if (lnh == HFI1_LRH_BTH)
+ ohdr = &hdr->u.oth;
+ else if (lnh == HFI1_LRH_GRH)
+ ohdr = &hdr->u.l.oth;
+ else
+ return HFI1_FILTER_ERR;
+
+ opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
+
+ if (*((u8 *)value) == ((opcode >> 5) & 0x7))
+ return HFI1_FILTER_HIT;
+
+ return HFI1_FILTER_MISS;
+}
+
+static int hfi1_filter_ib_service_level(void *ibhdr, void *packet_data,
+ void *value)
+{
+ struct hfi1_ib_header *hdr;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ if ((*((u8 *)value)) == ((be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF))
+ return HFI1_FILTER_HIT;
+
+ return HFI1_FILTER_MISS;
+}
+
+static int hfi1_filter_ib_pkey(void *ibhdr, void *packet_data, void *value)
+{
+
+ u32 lnh = 0;
+ struct hfi1_ib_header *hdr;
+ struct hfi1_other_headers *ohdr = NULL;
+ int ret;
+
+ ret = hfi1_filter_check(ibhdr, "header");
+ if (ret)
+ return ret;
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ hdr = (struct hfi1_ib_header *)ibhdr;
+
+ lnh = (be16_to_cpu(hdr->lrh[0]) & 3);
+ if (lnh == HFI1_LRH_BTH)
+ ohdr = &hdr->u.oth;
+ else if (lnh == HFI1_LRH_GRH)
+ ohdr = &hdr->u.l.oth;
+ else
+ return HFI1_FILTER_ERR;
+
+ /* P_key is 16-bit entity, however top most bit indicates
+ * type of membership. 0 for limited and 1 for Full.
+ * Limited members cannot accept information from other
+ * Limited members, but communication is allowed between
+ * every other combination of membership.
+ * Hence we'll omit comparing top-most bit while filtering
+ */
+
+ if ((*(u16 *)value & 0x7FFF) ==
+ ((be32_to_cpu(ohdr->bth[0])) & 0x7FFF))
+ return HFI1_FILTER_HIT;
+
+ return HFI1_FILTER_MISS;
+}
+
+/*
+ * If packet_data is NULL then this is coming from one of the send functions.
+ * Thus we know if its an ingressed or egressed packet.
+ */
+static int hfi1_filter_direction(void *ibhdr, void *packet_data, void *value)
+{
+ u8 user_dir = *(u8 *)value;
+ int ret;
+
+ ret = hfi1_filter_check(value, "user");
+ if (ret)
+ return ret;
+
+ if (packet_data) {
+ /* Incoming packet */
+ if (user_dir & HFI1_SNOOP_INGRESS)
+ return HFI1_FILTER_HIT;
+ } else {
+ /* Outgoing packet */
+ if (user_dir & HFI1_SNOOP_EGRESS)
+ return HFI1_FILTER_HIT;
+ }
+
+ return HFI1_FILTER_MISS;
+}
+
+/*
+ * Allocate a snoop packet. The structure that is stored in the ring buffer, not
+ * to be confused with an hfi packet type.
+ */
+static struct snoop_packet *allocate_snoop_packet(u32 hdr_len,
+ u32 data_len,
+ u32 md_len)
+{
+
+ struct snoop_packet *packet = NULL;
+
+ packet = kzalloc(sizeof(struct snoop_packet) + hdr_len + data_len
+ + md_len,
+ GFP_ATOMIC);
+ if (likely(packet))
+ INIT_LIST_HEAD(&packet->list);
+
+
+ return packet;
+}
+
+/*
+ * Instead of having snoop and capture code intermixed with the recv functions,
+ * both the interrupt handler and hfi1_ib_rcv() we are going to hijack the call
+ * and land in here for snoop/capture but if not enabled the call will go
+ * through as before. This gives us a single point to constrain all of the snoop
+ * snoop recv logic. There is nothing special that needs to happen for bypass
+ * packets. This routine should not try to look into the packet. It just copied
+ * it. There is no guarantee for filters when it comes to bypass packets as
+ * there is no specific support. Bottom line is this routine does now even know
+ * what a bypass packet is.
+ */
+int snoop_recv_handler(struct hfi1_packet *packet)
+{
+ struct hfi1_pportdata *ppd = packet->rcd->ppd;
+ struct hfi1_ib_header *hdr = packet->hdr;
+ int header_size = packet->hlen;
+ void *data = packet->ebuf;
+ u32 tlen = packet->tlen;
+ struct snoop_packet *s_packet = NULL;
+ int ret;
+ int snoop_mode = 0;
+ u32 md_len = 0;
+ struct capture_md md;
+
+ snoop_dbg("PACKET IN: hdr size %d tlen %d data %p", header_size, tlen,
+ data);
+
+ trace_snoop_capture(ppd->dd, header_size, hdr, tlen - header_size,
+ data);
+
+ if (!ppd->dd->hfi1_snoop.filter_callback) {
+ snoop_dbg("filter not set");
+ ret = HFI1_FILTER_HIT;
+ } else {
+ ret = ppd->dd->hfi1_snoop.filter_callback(hdr, data,
+ ppd->dd->hfi1_snoop.filter_value);
+ }
+
+ switch (ret) {
+ case HFI1_FILTER_ERR:
+ snoop_dbg("Error in filter call");
+ break;
+ case HFI1_FILTER_MISS:
+ snoop_dbg("Filter Miss");
+ break;
+ case HFI1_FILTER_HIT:
+
+ if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
+ snoop_mode = 1;
+ if ((snoop_mode == 0) ||
+ unlikely(snoop_flags & SNOOP_USE_METADATA))
+ md_len = sizeof(struct capture_md);
+
+
+ s_packet = allocate_snoop_packet(header_size,
+ tlen - header_size,
+ md_len);
+ if (unlikely(s_packet == NULL)) {
+ dd_dev_err(ppd->dd,
+ "Unable to allocate snoop/capture packet\n");
+ break;
+ }
+
+ if (md_len > 0) {
+ memset(&md, 0, sizeof(struct capture_md));
+ md.port = 1;
+ md.dir = PKT_DIR_INGRESS;
+ md.u.rhf = packet->rhf;
+ memcpy(s_packet->data, &md, md_len);
+ }
+
+ /* We should always have a header */
+ if (hdr) {
+ memcpy(s_packet->data + md_len, hdr, header_size);
+ } else {
+ dd_dev_err(ppd->dd, "Unable to copy header to snoop/capture packet\n");
+ kfree(s_packet);
+ break;
+ }
+
+ /*
+ * Packets with no data are possible. If there is no data needed
+ * to take care of the last 4 bytes which are normally included
+ * with data buffers and are included in tlen. Since we kzalloc
+ * the buffer we do not need to set any values but if we decide
+ * not to use kzalloc we should zero them.
+ */
+ if (data)
+ memcpy(s_packet->data + header_size + md_len, data,
+ tlen - header_size);
+
+ s_packet->total_len = tlen + md_len;
+ snoop_list_add_tail(s_packet, ppd->dd);
+
+ /*
+ * If we are snooping the packet not capturing then throw away
+ * after adding to the list.
+ */
+ snoop_dbg("Capturing packet");
+ if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE) {
+ snoop_dbg("Throwing packet away");
+ /*
+ * If we are dropping the packet we still may need to
+ * handle the case where error flags are set, this is
+ * normally done by the type specific handler but that
+ * won't be called in this case.
+ */
+ if (unlikely(rhf_err_flags(packet->rhf)))
+ handle_eflags(packet);
+
+ /* throw the packet on the floor */
+ return RHF_RCV_CONTINUE;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * We do not care what type of packet came in here - just pass it off
+ * to the normal handler.
+ */
+ return ppd->dd->normal_rhf_rcv_functions[rhf_rcv_type(packet->rhf)]
+ (packet);
+}
+
+/*
+ * Handle snooping and capturing packets when sdma is being used.
+ */
+int snoop_send_dma_handler(struct hfi1_qp *qp, struct ahg_ib_header *ibhdr,
+ u32 hdrwords, struct hfi1_sge_state *ss, u32 len,
+ u32 plen, u32 dwords, u64 pbc)
+{
+ pr_alert("Snooping/Capture of Send DMA Packets Is Not Supported!\n");
+ snoop_dbg("Unsupported Operation");
+ return hfi1_verbs_send_dma(qp, ibhdr, hdrwords, ss, len, plen, dwords,
+ 0);
+}
+
+/*
+ * Handle snooping and capturing packets when pio is being used. Does not handle
+ * bypass packets. The only way to send a bypass packet currently is to use the
+ * diagpkt interface. When that interface is enable snoop/capture is not.
+ */
+int snoop_send_pio_handler(struct hfi1_qp *qp, struct ahg_ib_header *ahdr,
+ u32 hdrwords, struct hfi1_sge_state *ss, u32 len,
+ u32 plen, u32 dwords, u64 pbc)
+{
+ struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+ struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+ struct snoop_packet *s_packet = NULL;
+ u32 *hdr = (u32 *)&ahdr->ibh;
+ u32 length = 0;
+ struct hfi1_sge_state temp_ss;
+ void *data = NULL;
+ void *data_start = NULL;
+ int ret;
+ int snoop_mode = 0;
+ int md_len = 0;
+ struct capture_md md;
+ u32 vl;
+ u32 hdr_len = hdrwords << 2;
+ u32 tlen = HFI1_GET_PKT_LEN(&ahdr->ibh);
+
+ md.u.pbc = 0;
+
+ snoop_dbg("PACKET OUT: hdrword %u len %u plen %u dwords %u tlen %u",
+ hdrwords, len, plen, dwords, tlen);
+ if (ppd->dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
+ snoop_mode = 1;
+ if ((snoop_mode == 0) ||
+ unlikely(snoop_flags & SNOOP_USE_METADATA))
+ md_len = sizeof(struct capture_md);
+
+ /* not using ss->total_len as arg 2 b/c that does not count CRC */
+ s_packet = allocate_snoop_packet(hdr_len, tlen - hdr_len, md_len);
+ s_packet->total_len = tlen + md_len;
+ if (unlikely(s_packet == NULL)) {
+ dd_dev_err(ppd->dd,
+ "Unable to allocate snoop/capture packet\n");
+ goto out;
+ }
+
+ if (md_len > 0) {
+ memset(&md, 0, sizeof(struct capture_md));
+ md.port = 1;
+ md.dir = PKT_DIR_EGRESS;
+ if (likely(pbc == 0)) {
+ vl = be16_to_cpu(ahdr->ibh.lrh[0]) >> 12;
+ md.u.pbc = create_pbc(ppd, 0, qp->s_srate, vl, plen);
+ } else {
+ md.u.pbc = 0;
+ }
+ memcpy(s_packet->data, &md, md_len);
+ } else {
+ md.u.pbc = pbc;
+ }
+
+ /* Copy header */
+ if (likely(hdr)) {
+ memcpy(s_packet->data + md_len, hdr, hdr_len);
+ } else {
+ dd_dev_err(ppd->dd,
+ "Unable to copy header to snoop/capture packet\n");
+ kfree(s_packet);
+ goto out;
+ }
+
+ if (ss) {
+ data = s_packet->data + hdr_len + md_len;
+ data_start = data;
+
+ /*
+ * Copy SGE State
+ * The update_sge() function below will not modify the
+ * individual SGEs in the array. It will make a copy each time
+ * and operate on that. So we only need to copy this instance
+ * and it won't impact PIO.
+ */
+ temp_ss = *ss;
+ length = len;
+
+ snoop_dbg("Need to copy %d bytes", length);
+ while (length) {
+ void *addr = temp_ss.sge.vaddr;
+ u32 slen = temp_ss.sge.length;
+
+ if (slen > length) {
+ slen = length;
+ snoop_dbg("slen %d > len %d", slen, length);
+ }
+ snoop_dbg("copy %d to %p", slen, addr);
+ memcpy(data, addr, slen);
+ update_sge(&temp_ss, slen);
+ length -= slen;
+ data += slen;
+ snoop_dbg("data is now %p bytes left %d", data, length);
+ }
+ snoop_dbg("Completed SGE copy");
+ }
+
+ /*
+ * Why do the filter check down here? Because the event tracing has its
+ * own filtering and we need to have the walked the SGE list.
+ */
+ if (!ppd->dd->hfi1_snoop.filter_callback) {
+ snoop_dbg("filter not set\n");
+ ret = HFI1_FILTER_HIT;
+ } else {
+ ret = ppd->dd->hfi1_snoop.filter_callback(
+ &ahdr->ibh,
+ NULL,
+ ppd->dd->hfi1_snoop.filter_value);
+ }
+
+ switch (ret) {
+ case HFI1_FILTER_ERR:
+ snoop_dbg("Error in filter call");
+ /* fall through */
+ case HFI1_FILTER_MISS:
+ snoop_dbg("Filter Miss");
+ kfree(s_packet);
+ break;
+ case HFI1_FILTER_HIT:
+ snoop_dbg("Capturing packet");
+ snoop_list_add_tail(s_packet, ppd->dd);
+
+ if (unlikely((snoop_flags & SNOOP_DROP_SEND) &&
+ (ppd->dd->hfi1_snoop.mode_flag &
+ HFI1_PORT_SNOOP_MODE))) {
+ unsigned long flags;
+
+ snoop_dbg("Dropping packet");
+ if (qp->s_wqe) {
+ spin_lock_irqsave(&qp->s_lock, flags);
+ hfi1_send_complete(
+ qp,
+ qp->s_wqe,
+ IB_WC_SUCCESS);
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ } else if (qp->ibqp.qp_type == IB_QPT_RC) {
+ spin_lock_irqsave(&qp->s_lock, flags);
+ hfi1_rc_send_complete(qp, &ahdr->ibh);
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ }
+ return 0;
+ }
+ break;
+ default:
+ kfree(s_packet);
+ break;
+ }
+out:
+ return hfi1_verbs_send_pio(qp, ahdr, hdrwords, ss, len, plen, dwords,
+ md.u.pbc);
+}
+
+/*
+ * Callers of this must pass a hfi1_ib_header type for the from ptr. Currently
+ * this can be used anywhere, but the intention is for inline ACKs for RC and
+ * CCA packets. We don't restrict this usage though.
+ */
+void snoop_inline_pio_send(struct hfi1_devdata *dd, struct pio_buf *pbuf,
+ u64 pbc, const void *from, size_t count)
+{
+ int snoop_mode = 0;
+ int md_len = 0;
+ struct capture_md md;
+ struct snoop_packet *s_packet = NULL;
+
+ /*
+ * count is in dwords so we need to convert to bytes.
+ * We also need to account for CRC which would be tacked on by hardware.
+ */
+ int packet_len = (count << 2) + 4;
+ int ret;
+
+ snoop_dbg("ACK OUT: len %d", packet_len);
+
+ if (!dd->hfi1_snoop.filter_callback) {
+ snoop_dbg("filter not set");
+ ret = HFI1_FILTER_HIT;
+ } else {
+ ret = dd->hfi1_snoop.filter_callback(
+ (struct hfi1_ib_header *)from,
+ NULL,
+ dd->hfi1_snoop.filter_value);
+ }
+
+ switch (ret) {
+ case HFI1_FILTER_ERR:
+ snoop_dbg("Error in filter call");
+ /* fall through */
+ case HFI1_FILTER_MISS:
+ snoop_dbg("Filter Miss");
+ break;
+ case HFI1_FILTER_HIT:
+ snoop_dbg("Capturing packet");
+ if (dd->hfi1_snoop.mode_flag & HFI1_PORT_SNOOP_MODE)
+ snoop_mode = 1;
+ if ((snoop_mode == 0) ||
+ unlikely(snoop_flags & SNOOP_USE_METADATA))
+ md_len = sizeof(struct capture_md);
+
+ s_packet = allocate_snoop_packet(packet_len, 0, md_len);
+ s_packet->total_len = packet_len + md_len;
+ if (unlikely(s_packet == NULL)) {
+ dd_dev_err(dd,
+ "Unable to allocate snoop/capture packet\n");
+ goto inline_pio_out;
+ }
+
+ /* Fill in the metadata for the packet */
+ if (md_len > 0) {
+ memset(&md, 0, sizeof(struct capture_md));
+ md.port = 1;
+ md.dir = PKT_DIR_EGRESS;
+ md.u.pbc = pbc;
+ memcpy(s_packet->data, &md, md_len);
+ }
+
+ /* Add the packet data which is a single buffer */
+ memcpy(s_packet->data + md_len, from, packet_len);
+
+ snoop_list_add_tail(s_packet, dd);
+
+ if (unlikely((snoop_flags & SNOOP_DROP_SEND) && snoop_mode)) {
+ snoop_dbg("Dropping packet");
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+
+inline_pio_out:
+ pio_copy(dd, pbuf, pbc, from, count);
+
+}