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Message-ID: <1423061322-16059-7-git-send-email-Emilian.Medve@Freescale.com>
Date: Wed, 4 Feb 2015 08:48:38 -0600
From: Emil Medve <Emilian.Medve@...escale.com>
To: <devel@...verdev.osuosl.org>, <linuxppc-dev@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>
CC: Geoff Thorpe <Geoff.Thorpe@...escale.com>
Subject: [RFC 06/10] fsl_qman: Add self-tester
From: Geoff Thorpe <Geoff.Thorpe@...escale.com>
Change-Id: I314d36d94717cfc34053b6212899f71cb729d16c
Signed-off-by: Geoff Thorpe <Geoff.Thorpe@...escale.com>
---
drivers/staging/fsl_qbman/Kconfig | 24 ++
drivers/staging/fsl_qbman/Makefile | 24 +-
drivers/staging/fsl_qbman/qman_test.c | 57 +++
drivers/staging/fsl_qbman/qman_test.h | 43 ++
drivers/staging/fsl_qbman/qman_test_high.c | 213 ++++++++++
drivers/staging/fsl_qbman/qman_test_hotpotato.c | 497 ++++++++++++++++++++++++
6 files changed, 848 insertions(+), 10 deletions(-)
create mode 100644 drivers/staging/fsl_qbman/qman_test.c
create mode 100644 drivers/staging/fsl_qbman/qman_test.h
create mode 100644 drivers/staging/fsl_qbman/qman_test_high.c
create mode 100644 drivers/staging/fsl_qbman/qman_test_hotpotato.c
diff --git a/drivers/staging/fsl_qbman/Kconfig b/drivers/staging/fsl_qbman/Kconfig
index 1875dbf..fdf2f3b 100644
--- a/drivers/staging/fsl_qbman/Kconfig
+++ b/drivers/staging/fsl_qbman/Kconfig
@@ -94,6 +94,30 @@ config FSL_QMAN_CONFIG
linux image is running as a guest OS under the hypervisor, only one
guest OS ("the control plane") needs this option.
+config FSL_QMAN_TEST
+ tristate "QMan self-tests"
+ default n
+ ---help---
+ This option compiles self-test code for QMan.
+
+config FSL_QMAN_TEST_HIGH
+ bool "QMan high-level self-test"
+ depends on FSL_QMAN_TEST
+ default y
+ ---help---
+ This requires the presence of cpu-affine portals, and performs
+ high-level API testing with them (whichever portal(s) are affine to
+ the cpu(s) the test executes on).
+
+config FSL_QMAN_TEST_STASH_POTATO
+ bool "QMan 'hot potato' data-stashing self-test"
+ depends on FSL_QMAN_TEST
+ default y
+ ---help---
+ This performs a "hot potato" style test enqueuing/dequeuing a frame
+ across a series of FQs scheduled to different portals (and cpus), with
+ DQRR, data and context stashing always on.
+
# H/w settings that can be hard-coded for now.
config FSL_QMAN_FQD_SZ
int "size of Frame Queue Descriptor region"
diff --git a/drivers/staging/fsl_qbman/Makefile b/drivers/staging/fsl_qbman/Makefile
index 0fcdd84..04d61f7 100644
--- a/drivers/staging/fsl_qbman/Makefile
+++ b/drivers/staging/fsl_qbman/Makefile
@@ -1,15 +1,19 @@
# Common
-obj-$(CONFIG_FSL_DPA) += dpa_alloc.o
-obj-$(CONFIG_HAS_FSL_QBMAN) += qbman_driver.o
+obj-$(CONFIG_FSL_DPA) += dpa_alloc.o
+obj-$(CONFIG_HAS_FSL_QBMAN) += qbman_driver.o
# Bman
-obj-$(CONFIG_FSL_BMAN) += bman_high.o
-obj-$(CONFIG_FSL_BMAN_CONFIG) += bman_config.o bman_driver.o
-obj-$(CONFIG_FSL_BMAN_TEST) += bman_tester.o
-bman_tester-y = bman_test.o
-bman_tester-$(CONFIG_FSL_BMAN_TEST_HIGH) += bman_test_high.o
-bman_tester-$(CONFIG_FSL_BMAN_TEST_THRESH) += bman_test_thresh.o
+obj-$(CONFIG_FSL_BMAN) += bman_high.o
+obj-$(CONFIG_FSL_BMAN_CONFIG) += bman_config.o bman_driver.o
+obj-$(CONFIG_FSL_BMAN_TEST) += bman_tester.o
+bman_tester-y = bman_test.o
+bman_tester-$(CONFIG_FSL_BMAN_TEST_HIGH) += bman_test_high.o
+bman_tester-$(CONFIG_FSL_BMAN_TEST_THRESH) += bman_test_thresh.o
# Qman
-obj-$(CONFIG_FSL_QMAN) += qman_high.o qman_utility.o
-obj-$(CONFIG_FSL_QMAN_CONFIG) += qman_config.o qman_driver.o
+obj-$(CONFIG_FSL_QMAN) += qman_high.o qman_utility.o
+obj-$(CONFIG_FSL_QMAN_CONFIG) += qman_config.o qman_driver.o
+obj-$(CONFIG_FSL_QMAN_TEST) += qman_tester.o
+qman_tester-y = qman_test.o
+qman_tester-$(CONFIG_FSL_QMAN_TEST_HIGH) += qman_test_high.o
+qman_tester-$(CONFIG_FSL_QMAN_TEST_STASH_POTATO) += qman_test_hotpotato.o
diff --git a/drivers/staging/fsl_qbman/qman_test.c b/drivers/staging/fsl_qbman/qman_test.c
new file mode 100644
index 0000000..09d8ea6
--- /dev/null
+++ b/drivers/staging/fsl_qbman/qman_test.c
@@ -0,0 +1,57 @@
+/* Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ * 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 Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+#include "qman_test.h"
+
+MODULE_AUTHOR("Geoff Thorpe");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("Qman testing");
+
+static int test_init(void)
+{
+ int loop = 1;
+ while (loop--) {
+#ifdef CONFIG_FSL_QMAN_TEST_STASH_POTATO
+ qman_test_hotpotato();
+#endif
+#ifdef CONFIG_FSL_QMAN_TEST_HIGH
+ qman_test_high();
+#endif
+ }
+ return 0;
+}
+
+static void test_exit(void)
+{
+}
+
+module_init(test_init);
+module_exit(test_exit);
diff --git a/drivers/staging/fsl_qbman/qman_test.h b/drivers/staging/fsl_qbman/qman_test.h
new file mode 100644
index 0000000..0290e8f
--- /dev/null
+++ b/drivers/staging/fsl_qbman/qman_test.h
@@ -0,0 +1,43 @@
+/* Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ * 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 Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+
+#include <linux/fsl_qman.h>
+
+void qman_test_hotpotato(void);
+void qman_test_high(void);
diff --git a/drivers/staging/fsl_qbman/qman_test_high.c b/drivers/staging/fsl_qbman/qman_test_high.c
new file mode 100644
index 0000000..91b8574
--- /dev/null
+++ b/drivers/staging/fsl_qbman/qman_test_high.c
@@ -0,0 +1,213 @@
+/* Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ * 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 Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+#include "qman_test.h"
+
+/*************/
+/* constants */
+/*************/
+
+#define CGR_ID 27
+#define POOL_ID 2
+#define FQ_FLAGS QMAN_FQ_FLAG_DYNAMIC_FQID
+#define NUM_ENQUEUES 10
+#define NUM_PARTIAL 4
+#define PORTAL_SDQCR (QM_SDQCR_SOURCE_CHANNELS | \
+ QM_SDQCR_TYPE_PRIO_QOS | \
+ QM_SDQCR_TOKEN_SET(0x98) | \
+ QM_SDQCR_CHANNELS_DEDICATED | \
+ QM_SDQCR_CHANNELS_POOL(POOL_ID))
+#define PORTAL_OPAQUE ((void *)0xf00dbeef)
+#define VDQCR_FLAGS (QMAN_VOLATILE_FLAG_WAIT | QMAN_VOLATILE_FLAG_FINISH)
+
+/*************************************/
+/* Predeclarations (eg. for fq_base) */
+/*************************************/
+
+static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *,
+ struct qman_fq *,
+ const struct qm_dqrr_entry *);
+static void cb_ern(struct qman_portal *, struct qman_fq *,
+ const struct qm_mr_entry *);
+static void cb_fqs(struct qman_portal *, struct qman_fq *,
+ const struct qm_mr_entry *);
+
+/***************/
+/* global vars */
+/***************/
+
+static struct qm_fd fd, fd_dq;
+static struct qman_fq fq_base = {
+ .cb.dqrr = cb_dqrr,
+ .cb.ern = cb_ern,
+ .cb.fqs = cb_fqs
+};
+static DECLARE_WAIT_QUEUE_HEAD(waitqueue);
+static int retire_complete, sdqcr_complete;
+
+/**********************/
+/* internal functions */
+/**********************/
+
+/* Helpers for initialising and "incrementing" a frame descriptor */
+static void fd_init(struct qm_fd *__fd)
+{
+ qm_fd_addr_set64(__fd, 0xabdeadbeefLLU);
+ __fd->format = qm_fd_contig_big;
+ __fd->length29 = 0x0000ffff;
+ __fd->cmd = 0xfeedf00d;
+}
+
+static void fd_inc(struct qm_fd *__fd)
+{
+ u64 t = qm_fd_addr_get64(__fd);
+ int z = t >> 40;
+ t <<= 1;
+ if (z)
+ t |= 1;
+ qm_fd_addr_set64(__fd, t);
+ __fd->length29--;
+ __fd->cmd++;
+}
+
+/* The only part of the 'fd' we can't memcmp() is the ppid */
+static int fd_cmp(const struct qm_fd *a, const struct qm_fd *b)
+{
+ int r = (qm_fd_addr_get64(a) == qm_fd_addr_get64(b)) ? 0 : -1;
+ if (!r)
+ r = a->format - b->format;
+ if (!r)
+ r = a->opaque - b->opaque;
+ if (!r)
+ r = a->cmd - b->cmd;
+ return r;
+}
+
+/********/
+/* test */
+/********/
+
+static void do_enqueues(struct qman_fq *fq)
+{
+ unsigned int loop;
+ for (loop = 0; loop < NUM_ENQUEUES; loop++) {
+ if (qman_enqueue(fq, &fd, QMAN_ENQUEUE_FLAG_WAIT |
+ (((loop + 1) == NUM_ENQUEUES) ?
+ QMAN_ENQUEUE_FLAG_WAIT_SYNC : 0)))
+ panic("qman_enqueue() failed\n");
+ fd_inc(&fd);
+ }
+}
+
+void qman_test_high(void)
+{
+ unsigned int flags;
+ int res;
+ struct qman_fq *fq = &fq_base;
+
+ pr_info("qman_test_high starting\n");
+ fd_init(&fd);
+ fd_init(&fd_dq);
+
+ /* Initialise (parked) FQ */
+ if (qman_create_fq(0, FQ_FLAGS, fq))
+ panic("qman_create_fq() failed\n");
+ if (qman_init_fq(fq, QMAN_INITFQ_FLAG_LOCAL, NULL))
+ panic("qman_init_fq() failed\n");
+
+ /* Do enqueues + VDQCR, twice. (Parked FQ) */
+ do_enqueues(fq);
+ pr_info("VDQCR (till-empty);\n");
+ if (qman_volatile_dequeue(fq, VDQCR_FLAGS,
+ QM_VDQCR_NUMFRAMES_TILLEMPTY))
+ panic("qman_volatile_dequeue() failed\n");
+ do_enqueues(fq);
+ pr_info("VDQCR (%d of %d);\n", NUM_PARTIAL, NUM_ENQUEUES);
+ if (qman_volatile_dequeue(fq, VDQCR_FLAGS,
+ QM_VDQCR_NUMFRAMES_SET(NUM_PARTIAL)))
+ panic("qman_volatile_dequeue() failed\n");
+ pr_info("VDQCR (%d of %d);\n", NUM_ENQUEUES - NUM_PARTIAL,
+ NUM_ENQUEUES);
+ if (qman_volatile_dequeue(fq, VDQCR_FLAGS,
+ QM_VDQCR_NUMFRAMES_SET(NUM_ENQUEUES - NUM_PARTIAL)))
+ panic("qman_volatile_dequeue() failed\n");
+
+ do_enqueues(fq);
+ pr_info("scheduled dequeue (till-empty)\n");
+ if (qman_schedule_fq(fq))
+ panic("qman_schedule_fq() failed\n");
+ wait_event(waitqueue, sdqcr_complete);
+
+ /* Retire and OOS the FQ */
+ res = qman_retire_fq(fq, &flags);
+ if (res < 0)
+ panic("qman_retire_fq() failed\n");
+ wait_event(waitqueue, retire_complete);
+ if (flags & QMAN_FQ_STATE_BLOCKOOS)
+ panic("leaking frames\n");
+ if (qman_oos_fq(fq))
+ panic("qman_oos_fq() failed\n");
+ qman_destroy_fq(fq, 0);
+ pr_info("qman_test_high finished\n");
+}
+
+static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *p,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dq)
+{
+ if (fd_cmp(&fd_dq, &dq->fd)) {
+ pr_err("BADNESS: dequeued frame doesn't match;\n");
+ BUG();
+ }
+ fd_inc(&fd_dq);
+ if (!(dq->stat & QM_DQRR_STAT_UNSCHEDULED) && !fd_cmp(&fd_dq, &fd)) {
+ sdqcr_complete = 1;
+ wake_up(&waitqueue);
+ }
+ return qman_cb_dqrr_consume;
+}
+
+static void cb_ern(struct qman_portal *p, struct qman_fq *fq,
+ const struct qm_mr_entry *msg)
+{
+ panic("cb_ern() unimplemented");
+}
+
+static void cb_fqs(struct qman_portal *p, struct qman_fq *fq,
+ const struct qm_mr_entry *msg)
+{
+ u8 verb = (msg->verb & QM_MR_VERB_TYPE_MASK);
+ if ((verb != QM_MR_VERB_FQRN) && (verb != QM_MR_VERB_FQRNI))
+ panic("unexpected FQS message");
+ pr_info("Retirement message received\n");
+ retire_complete = 1;
+ wake_up(&waitqueue);
+}
diff --git a/drivers/staging/fsl_qbman/qman_test_hotpotato.c b/drivers/staging/fsl_qbman/qman_test_hotpotato.c
new file mode 100644
index 0000000..bff1de1
--- /dev/null
+++ b/drivers/staging/fsl_qbman/qman_test_hotpotato.c
@@ -0,0 +1,497 @@
+/* Copyright 2009-2012 Freescale Semiconductor, Inc.
+ *
+ * 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 Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+#include <linux/kthread.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include "qman_test.h"
+
+/* Algorithm:
+ *
+ * Each cpu will have HP_PER_CPU "handlers" set up, each of which incorporates
+ * an rx/tx pair of FQ objects (both of which are stashed on dequeue). The
+ * organisation of FQIDs is such that the HP_PER_CPU*NUM_CPUS handlers will
+ * shuttle a "hot potato" frame around them such that every forwarding action
+ * moves it from one cpu to another. (The use of more than one handler per cpu
+ * is to allow enough handlers/FQs to truly test the significance of caching -
+ * ie. when cache-expiries are occurring.)
+ *
+ * The "hot potato" frame content will be HP_NUM_WORDS*4 bytes in size, and the
+ * first and last words of the frame data will undergo a transformation step on
+ * each forwarding action. To achieve this, each handler will be assigned a
+ * 32-bit "mixer", that is produced using a 32-bit LFSR. When a frame is
+ * received by a handler, the mixer of the expected sender is XOR'd into all
+ * words of the entire frame, which is then validated against the original
+ * values. Then, before forwarding, the entire frame is XOR'd with the mixer of
+ * the current handler. Apart from validating that the frame is taking the
+ * expected path, this also provides some quasi-realistic overheads to each
+ * forwarding action - dereferencing *all* the frame data, computation, and
+ * conditional branching. There is a "special" handler designated to act as the
+ * instigator of the test by creating an enqueuing the "hot potato" frame, and
+ * to determine when the test has completed by counting HP_LOOPS iterations.
+ *
+ * Init phases:
+ *
+ * 1. prepare each cpu's 'hp_cpu' struct using on_each_cpu(,,1) and link them
+ * into 'hp_cpu_list'. Specifically, set processor_id, allocate HP_PER_CPU
+ * handlers and link-list them (but do no other handler setup).
+ *
+ * 2. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
+ * hp_cpu's 'iterator' to point to its first handler. With each loop,
+ * allocate rx/tx FQIDs and mixer values to the hp_cpu's iterator handler
+ * and advance the iterator for the next loop. This includes a final fixup,
+ * which connects the last handler to the first (and which is why phase 2
+ * and 3 are separate).
+ *
+ * 3. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
+ * hp_cpu's 'iterator' to point to its first handler. With each loop,
+ * initialise FQ objects and advance the iterator for the next loop.
+ * Moreover, do this initialisation on the cpu it applies to so that Rx FQ
+ * initialisation targets the correct cpu.
+ */
+
+/* helper to run something on all cpus (can't use on_each_cpu(), as that invokes
+ * the fn from irq context, which is too restrictive). */
+struct bstrap {
+ void (*fn)(void);
+ atomic_t started;
+};
+static int bstrap_fn(void *__bstrap)
+{
+ struct bstrap *bstrap = __bstrap;
+ atomic_inc(&bstrap->started);
+ bstrap->fn();
+ while (!kthread_should_stop())
+ msleep(1);
+ return 0;
+}
+static int on_all_cpus(void (*fn)(void))
+{
+ int cpu;
+ for_each_cpu(cpu, cpu_online_mask) {
+ struct bstrap bstrap = {
+ .fn = fn,
+ .started = ATOMIC_INIT(0)
+ };
+ struct task_struct *k = kthread_create(bstrap_fn, &bstrap,
+ "hotpotato%d", cpu);
+ int ret;
+ if (IS_ERR(k))
+ return -ENOMEM;
+ kthread_bind(k, cpu);
+ wake_up_process(k);
+ /* If we call kthread_stop() before the "wake up" has had an
+ * effect, then the thread may exit with -EINTR without ever
+ * running the function. So poll until it's started before
+ * requesting it to stop. */
+ while (!atomic_read(&bstrap.started))
+ msleep(10);
+ ret = kthread_stop(k);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+struct hp_handler {
+
+ /* The following data is stashed when 'rx' is dequeued; */
+ /* -------------- */
+ /* The Rx FQ, dequeues of which will stash the entire hp_handler */
+ struct qman_fq rx;
+ /* The Tx FQ we should forward to */
+ struct qman_fq tx;
+ /* The value we XOR post-dequeue, prior to validating */
+ u32 rx_mixer;
+ /* The value we XOR pre-enqueue, after validating */
+ u32 tx_mixer;
+ /* what the hotpotato address should be on dequeue */
+ dma_addr_t addr;
+ u32 *frame_ptr;
+
+ /* The following data isn't (necessarily) stashed on dequeue; */
+ /* -------------- */
+ u32 fqid_rx, fqid_tx;
+ /* list node for linking us into 'hp_cpu' */
+ struct list_head node;
+ /* Just to check ... */
+ unsigned int processor_id;
+} ____cacheline_aligned;
+
+struct hp_cpu {
+ /* identify the cpu we run on; */
+ unsigned int processor_id;
+ /* root node for the per-cpu list of handlers */
+ struct list_head handlers;
+ /* list node for linking us into 'hp_cpu_list' */
+ struct list_head node;
+ /* when repeatedly scanning 'hp_list', each time linking the n'th
+ * handlers together, this is used as per-cpu iterator state */
+ struct hp_handler *iterator;
+};
+
+/* Each cpu has one of these */
+static DEFINE_PER_CPU(struct hp_cpu, hp_cpus);
+
+/* links together the hp_cpu structs, in first-come first-serve order. */
+static LIST_HEAD(hp_cpu_list);
+static spinlock_t hp_lock = __SPIN_LOCK_UNLOCKED(hp_lock);
+
+static unsigned int hp_cpu_list_length;
+
+/* the "special" handler, that starts and terminates the test. */
+static struct hp_handler *special_handler;
+static int loop_counter;
+
+/* handlers are allocated out of this, so they're properly aligned. */
+static struct kmem_cache *hp_handler_slab;
+
+/* this is the frame data */
+static void *__frame_ptr;
+static u32 *frame_ptr;
+static dma_addr_t frame_dma;
+
+/* the main function waits on this */
+static DECLARE_WAIT_QUEUE_HEAD(queue);
+
+#define HP_PER_CPU 2
+#define HP_LOOPS 8
+/* 80 bytes, like a small ethernet frame, and bleeds into a second cacheline */
+#define HP_NUM_WORDS 80
+/* First word of the LFSR-based frame data */
+#define HP_FIRST_WORD 0xabbaf00d
+
+static inline u32 do_lfsr(u32 prev)
+{
+ return (prev >> 1) ^ (-(prev & 1u) & 0xd0000001u);
+}
+
+static void allocate_frame_data(void)
+{
+ u32 lfsr = HP_FIRST_WORD;
+ int loop;
+ struct platform_device *pdev = platform_device_alloc("foobar", -1);
+ if (!pdev)
+ panic("platform_device_alloc() failed");
+ if (platform_device_add(pdev))
+ panic("platform_device_add() failed");
+ __frame_ptr = kmalloc(4 * HP_NUM_WORDS, GFP_KERNEL);
+ if (!__frame_ptr)
+ panic("kmalloc() failed");
+ frame_ptr = (void *)(((unsigned long)__frame_ptr + 63) &
+ ~(unsigned long)63);
+ for (loop = 0; loop < HP_NUM_WORDS; loop++) {
+ frame_ptr[loop] = lfsr;
+ lfsr = do_lfsr(lfsr);
+ }
+ frame_dma = dma_map_single(&pdev->dev, frame_ptr, 4 * HP_NUM_WORDS,
+ DMA_BIDIRECTIONAL);
+ platform_device_del(pdev);
+ platform_device_put(pdev);
+}
+
+static void deallocate_frame_data(void)
+{
+ kfree(__frame_ptr);
+}
+
+static inline void process_frame_data(struct hp_handler *handler,
+ const struct qm_fd *fd)
+{
+ u32 *p = handler->frame_ptr;
+ u32 lfsr = HP_FIRST_WORD;
+ int loop;
+ if (qm_fd_addr_get64(fd) != handler->addr)
+ panic("bad frame address");
+ for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
+ *p ^= handler->rx_mixer;
+ if (*p != lfsr)
+ panic("corrupt frame data");
+ *p ^= handler->tx_mixer;
+ lfsr = do_lfsr(lfsr);
+ }
+}
+
+static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dqrr)
+{
+ struct hp_handler *handler = (struct hp_handler *)fq;
+
+ process_frame_data(handler, &dqrr->fd);
+ if (qman_enqueue(&handler->tx, &dqrr->fd, 0))
+ panic("qman_enqueue() failed");
+ return qman_cb_dqrr_consume;
+}
+
+static enum qman_cb_dqrr_result special_dqrr(struct qman_portal *portal,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dqrr)
+{
+ struct hp_handler *handler = (struct hp_handler *)fq;
+
+ process_frame_data(handler, &dqrr->fd);
+ if (++loop_counter < HP_LOOPS) {
+ if (qman_enqueue(&handler->tx, &dqrr->fd, 0))
+ panic("qman_enqueue() failed");
+ } else {
+ pr_info("Received final (%dth) frame\n", loop_counter);
+ wake_up(&queue);
+ }
+ return qman_cb_dqrr_consume;
+}
+
+static void create_per_cpu_handlers(void)
+{
+ struct hp_handler *handler;
+ int loop;
+ struct hp_cpu *hp_cpu = &__get_cpu_var(hp_cpus);
+
+ hp_cpu->processor_id = smp_processor_id();
+ spin_lock(&hp_lock);
+ list_add_tail(&hp_cpu->node, &hp_cpu_list);
+ hp_cpu_list_length++;
+ spin_unlock(&hp_lock);
+ INIT_LIST_HEAD(&hp_cpu->handlers);
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ handler = kmem_cache_alloc(hp_handler_slab, GFP_KERNEL);
+ if (!handler)
+ panic("kmem_cache_alloc() failed");
+ handler->processor_id = hp_cpu->processor_id;
+ handler->addr = frame_dma;
+ handler->frame_ptr = frame_ptr;
+ list_add_tail(&handler->node, &hp_cpu->handlers);
+ }
+}
+
+static void destroy_per_cpu_handlers(void)
+{
+ struct list_head *loop, *tmp;
+ struct hp_cpu *hp_cpu = &__get_cpu_var(hp_cpus);
+
+ spin_lock(&hp_lock);
+ list_del(&hp_cpu->node);
+ spin_unlock(&hp_lock);
+ list_for_each_safe(loop, tmp, &hp_cpu->handlers) {
+ u32 flags;
+ struct hp_handler *handler = list_entry(loop, struct hp_handler,
+ node);
+ if (qman_retire_fq(&handler->rx, &flags))
+ panic("qman_retire_fq(rx) failed");
+ BUG_ON(flags & QMAN_FQ_STATE_BLOCKOOS);
+ if (qman_oos_fq(&handler->rx))
+ panic("qman_oos_fq(rx) failed");
+ qman_destroy_fq(&handler->rx, 0);
+ qman_destroy_fq(&handler->tx, 0);
+ qman_release_fqid(handler->fqid_rx);
+ list_del(&handler->node);
+ kmem_cache_free(hp_handler_slab, handler);
+ }
+}
+
+static inline u8 num_cachelines(u32 offset)
+{
+ u8 res = (offset + (L1_CACHE_BYTES - 1))
+ / (L1_CACHE_BYTES);
+ if (res > 3)
+ return 3;
+ return res;
+}
+#define STASH_DATA_CL \
+ num_cachelines(HP_NUM_WORDS * 4)
+#define STASH_CTX_CL \
+ num_cachelines(offsetof(struct hp_handler, fqid_rx))
+
+static void init_handler(void *__handler)
+{
+ struct qm_mcc_initfq opts;
+ struct hp_handler *handler = __handler;
+ BUG_ON(handler->processor_id != smp_processor_id());
+ /* Set up rx */
+ memset(&handler->rx, 0, sizeof(handler->rx));
+ if (handler == special_handler)
+ handler->rx.cb.dqrr = special_dqrr;
+ else
+ handler->rx.cb.dqrr = normal_dqrr;
+ if (qman_create_fq(handler->fqid_rx, 0, &handler->rx))
+ panic("qman_create_fq(rx) failed");
+ memset(&opts, 0, sizeof(opts));
+ opts.we_mask = QM_INITFQ_WE_FQCTRL | QM_INITFQ_WE_CONTEXTA;
+ opts.fqd.fq_ctrl = QM_FQCTRL_CTXASTASHING;
+ opts.fqd.context_a.stashing.data_cl = STASH_DATA_CL;
+ opts.fqd.context_a.stashing.context_cl = STASH_CTX_CL;
+ if (qman_init_fq(&handler->rx, QMAN_INITFQ_FLAG_SCHED |
+ QMAN_INITFQ_FLAG_LOCAL, &opts))
+ panic("qman_init_fq(rx) failed");
+ /* Set up tx */
+ memset(&handler->tx, 0, sizeof(handler->tx));
+ if (qman_create_fq(handler->fqid_tx, QMAN_FQ_FLAG_NO_MODIFY,
+ &handler->tx))
+ panic("qman_create_fq(tx) failed");
+}
+
+static void init_phase2(void)
+{
+ int loop;
+ u32 fqid = 0;
+ u32 lfsr = 0xdeadbeef;
+ struct hp_cpu *hp_cpu;
+ struct hp_handler *handler;
+
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
+ int ret;
+ if (!loop)
+ hp_cpu->iterator = list_first_entry(
+ &hp_cpu->handlers,
+ struct hp_handler, node);
+ else
+ hp_cpu->iterator = list_entry(
+ hp_cpu->iterator->node.next,
+ struct hp_handler, node);
+ /* Rx FQID is the previous handler's Tx FQID */
+ hp_cpu->iterator->fqid_rx = fqid;
+ /* Allocate new FQID for Tx */
+ ret = qman_alloc_fqid(&fqid);
+ if (ret)
+ panic("qman_alloc_fqid() failed");
+ hp_cpu->iterator->fqid_tx = fqid;
+ /* Rx mixer is the previous handler's Tx mixer */
+ hp_cpu->iterator->rx_mixer = lfsr;
+ /* Get new mixer for Tx */
+ lfsr = do_lfsr(lfsr);
+ hp_cpu->iterator->tx_mixer = lfsr;
+ }
+ }
+ /* Fix up the first handler (fqid_rx==0, rx_mixer=0xdeadbeef) */
+ hp_cpu = list_first_entry(&hp_cpu_list, struct hp_cpu, node);
+ handler = list_first_entry(&hp_cpu->handlers, struct hp_handler, node);
+ BUG_ON((handler->fqid_rx != 0) || (handler->rx_mixer != 0xdeadbeef));
+ handler->fqid_rx = fqid;
+ handler->rx_mixer = lfsr;
+ /* and tag it as our "special" handler */
+ special_handler = handler;
+}
+
+static void init_phase3(void)
+{
+ int loop;
+ struct hp_cpu *hp_cpu;
+
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
+ if (!loop)
+ hp_cpu->iterator = list_first_entry(
+ &hp_cpu->handlers,
+ struct hp_handler, node);
+ else
+ hp_cpu->iterator = list_entry(
+ hp_cpu->iterator->node.next,
+ struct hp_handler, node);
+ preempt_disable();
+ if (hp_cpu->processor_id == smp_processor_id())
+ init_handler(hp_cpu->iterator);
+ else
+ smp_call_function_single(hp_cpu->processor_id,
+ init_handler, hp_cpu->iterator, 1);
+ preempt_enable();
+ }
+ }
+}
+
+static void send_first_frame(void *ignore)
+{
+ u32 *p = special_handler->frame_ptr;
+ u32 lfsr = HP_FIRST_WORD;
+ int loop;
+ struct qm_fd fd;
+
+ BUG_ON(special_handler->processor_id != smp_processor_id());
+ memset(&fd, 0, sizeof(fd));
+ qm_fd_addr_set64(&fd, special_handler->addr);
+ fd.format = qm_fd_contig_big;
+ fd.length29 = HP_NUM_WORDS * 4;
+ for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
+ if (*p != lfsr)
+ panic("corrupt frame data");
+ *p ^= special_handler->tx_mixer;
+ lfsr = do_lfsr(lfsr);
+ }
+ pr_info("Sending first frame\n");
+ if (qman_enqueue(&special_handler->tx, &fd, 0))
+ panic("qman_enqueue() failed");
+}
+
+void qman_test_hotpotato(void)
+{
+ if (cpumask_weight(cpu_online_mask) < 2) {
+ pr_info("qman_test_hotpotato, skip - only 1 CPU\n");
+ return;
+ }
+
+ pr_info("qman_test_hotpotato starting\n");
+
+ hp_cpu_list_length = 0;
+ loop_counter = 0;
+ hp_handler_slab = kmem_cache_create("hp_handler_slab",
+ sizeof(struct hp_handler), L1_CACHE_BYTES,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!hp_handler_slab)
+ panic("kmem_cache_create() failed");
+
+ allocate_frame_data();
+
+ /* Init phase 1 */
+ pr_info("Creating %d handlers per cpu...\n", HP_PER_CPU);
+ if (on_all_cpus(create_per_cpu_handlers))
+ panic("on_each_cpu() failed");
+ pr_info("Number of cpus: %d, total of %d handlers\n",
+ hp_cpu_list_length, hp_cpu_list_length * HP_PER_CPU);
+
+ init_phase2();
+
+ init_phase3();
+
+ preempt_disable();
+ if (special_handler->processor_id == smp_processor_id())
+ send_first_frame(NULL);
+ else
+ smp_call_function_single(special_handler->processor_id,
+ send_first_frame, NULL, 1);
+ preempt_enable();
+
+ wait_event(queue, loop_counter == HP_LOOPS);
+ deallocate_frame_data();
+ if (on_all_cpus(destroy_per_cpu_handlers))
+ panic("on_each_cpu() failed");
+ kmem_cache_destroy(hp_handler_slab);
+ pr_info("qman_test_hotpotato finished\n");
+}
--
2.2.2
--
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