Update libusb 1.0.9 to libusbx 1.0.16

third_party/libusb/src/examples/sam3u_benchmark.c

+/*
+ * libusb example program to measure Atmel SAM3U isochronous performance
+ * Copyright (C) 2012 Harald Welte <laforge@gnumonks.org>
+ *
+ * Copied with the author's permission under LGPL-2.1 from
+ * http://git.gnumonks.org/cgi-bin/gitweb.cgi?p=sam3u-tests.git;a=blob;f=usb-benchmark-project/host/benchmark.c;h=74959f7ee88f1597286cd435f312a8ff52c56b7e
+ *
+ * An Atmel SAM3U test firmware is also available in the above repository.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <signal.h>
+
+#include <libusb.h>
+
+
+#define EP_DATA_IN      0x82
+#define EP_ISO_IN       0x86
+
+static int do_exit = 0;
+static struct libusb_device_handle *devh = NULL;
+
+static unsigned long num_bytes = 0, num_xfer = 0;
+static struct timeval tv_start;
+
+static void LIBUSB_CALL cb_xfr(struct libusb_transfer *xfr)
+{
+        unsigned int i;
+
+        if (xfr->status != LIBUSB_TRANSFER_COMPLETED) {
+                fprintf(stderr, "transfer status %d\n", xfr->status);
+                libusb_free_transfer(xfr);
+                exit(3);
+        }
+
+        if (xfr->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+                for (i = 0; i < xfr->num_iso_packets; i++) {
+                        struct libusb_iso_packet_descriptor *pack = &xfr->iso_packet_desc[i];
+
+                        if (pack->status != LIBUSB_TRANSFER_COMPLETED) {
+                                fprintf(stderr, "Error: pack %u status %d\n", i, pack->status);
+                                exit(5);
+                        }
+
+                        printf("pack%u length:%u, actual_length:%u\n", i, pack->length, pack->actual_length);
+                }
+        }
+
+        printf("length:%u, actual_length:%u\n", xfr->length, xfr->actual_length);
+        for (i = 0; i < xfr->actual_length; i++) {
+                printf("%02x", xfr->buffer[i]);
+                if (i % 16)
+                        printf("\n");
+                else if (i % 8)
+                        printf("  ");
+                else
+                        printf(" ");
+        }
+        num_bytes += xfr->actual_length;
+        num_xfer++;
+
+        if (libusb_submit_transfer(xfr) < 0) {
+                fprintf(stderr, "error re-submitting URB\n");
+                exit(1);
+        }
+}
+
+static int benchmark_in(uint8_t ep)
+{
+        static uint8_t buf[2048];
+        static struct libusb_transfer *xfr;
+        int num_iso_pack = 0;
+
+        if (ep == EP_ISO_IN)
+                num_iso_pack = 16;
+
+        xfr = libusb_alloc_transfer(num_iso_pack);
+        if (!xfr)
+                return -ENOMEM;
+
+        if (ep == EP_ISO_IN) {
+                libusb_fill_iso_transfer(xfr, devh, ep, buf,
+                                sizeof(buf), num_iso_pack, cb_xfr, NULL, 0);
+                libusb_set_iso_packet_lengths(xfr, sizeof(buf)/num_iso_pack);
+        } else
+                libusb_fill_bulk_transfer(xfr, devh, ep, buf,
+                                sizeof(buf), cb_xfr, NULL, 0);
+
+        gettimeofday(&tv_start, NULL);
+
+        /* NOTE: To reach maximum possible performance the program must
+         * submit *multiple* transfers here, not just one.
+         *
+         * When only one transfer is submitted there is a gap in the bus
+         * schedule from when the transfer completes until a new transfer
+         * is submitted by the callback. This causes some jitter for
+         * isochronous transfers and loss of throughput for bulk transfers.
+         *
+         * This is avoided by queueing multiple transfers in advance, so
+         * that the host controller is always kept busy, and will schedule
+         * more transfers on the bus while the callback is running for
+         * transfers which have completed on the bus.
+         */
+
+        return libusb_submit_transfer(xfr);
+}
+
+static void measure(void)
+{
+        struct timeval tv_stop;
+        unsigned int diff_msec;
+
+        gettimeofday(&tv_stop, NULL);
+
+        diff_msec = (tv_stop.tv_sec - tv_start.tv_sec)*1000;
+        diff_msec += (tv_stop.tv_usec - tv_start.tv_usec)/1000;
+
+        printf("%lu transfers (total %lu bytes) in %u miliseconds => %lu bytes/sec\n",
+                num_xfer, num_bytes, diff_msec, (num_bytes*1000)/diff_msec);
+}
+
+static void sig_hdlr(int signum)
+{
+        switch (signum) {
+        case SIGINT:
+                measure();
+                do_exit = 1;
+                break;
+        }
+}
+
+int main(int argc, char **argv)
+{
+        int rc;
+        struct sigaction sigact;
+
+        sigact.sa_handler = sig_hdlr;
+        sigemptyset(&sigact.sa_mask);
+        sigact.sa_flags = 0;
+        sigaction(SIGINT, &sigact, NULL);
+
+        rc = libusb_init(NULL);
+        if (rc < 0) {
+                fprintf(stderr, "Error initializing libusb: %s\n", libusb_error_name(rc));
+                exit(1);
+        }
+
+        devh = libusb_open_device_with_vid_pid(NULL, 0x16c0, 0x0763);
+        if (!devh) {
+                fprintf(stderr, "Error finding USB device\n");
+                goto out;
+        }
+
+        rc = libusb_claim_interface(devh, 2);
+        if (rc < 0) {
+                fprintf(stderr, "Error claiming interface: %s\n", libusb_error_name(rc));
+                goto out;
+        }
+
+        benchmark_in(EP_ISO_IN);
+
+        while (!do_exit) {
+                rc = libusb_handle_events(NULL);
+                if (rc != LIBUSB_SUCCESS)
+                        break;
+        }
+
+        /* Measurement has already been done by the signal handler. */
+
+        libusb_release_interface(devh, 0);
+out:
+        if (devh)
+                libusb_close(devh);
+        libusb_exit(NULL);
+        return rc;
+}