From patchwork Wed Dec 10 21:37:49 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huawei Xie X-Patchwork-Id: 1930 Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [IPv6:::1]) by dpdk.org (Postfix) with ESMTP id 57A577F8C; Wed, 10 Dec 2014 22:38:35 +0100 (CET) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id E27D17E79 for ; Wed, 10 Dec 2014 22:38:32 +0100 (CET) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga102.fm.intel.com with ESMTP; 10 Dec 2014 13:38:17 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,862,1389772800"; d="scan'208";a="427503268" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by FMSMGA003.fm.intel.com with ESMTP; 10 Dec 2014 13:27:33 -0800 Received: from shecgisg003.sh.intel.com (shecgisg003.sh.intel.com [10.239.29.90]) by shvmail01.sh.intel.com with ESMTP id sBALcFQ0000868; Thu, 11 Dec 2014 05:38:15 +0800 Received: from shecgisg003.sh.intel.com (localhost [127.0.0.1]) by shecgisg003.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id sBALcC01013982; Thu, 11 Dec 2014 05:38:14 +0800 Received: (from hxie5@localhost) by shecgisg003.sh.intel.com (8.13.6/8.13.6/Submit) id sBALcCga013978; Thu, 11 Dec 2014 05:38:12 +0800 From: Huawei Xie To: dev@dpdk.org Date: Thu, 11 Dec 2014 05:37:49 +0800 Message-Id: <1418247477-13920-5-git-send-email-huawei.xie@intel.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1418247477-13920-1-git-send-email-huawei.xie@intel.com> References: <1418247477-13920-1-git-send-email-huawei.xie@intel.com> Cc: haifeng.lin@intel.com Subject: [dpdk-dev] [PATCH RFC v2 04/12] lib/librte_vhost: copy of host_memory_map from virtio-net.c to new file virtio-net-cdev.c X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" create virtio-net-cdev.c and copy host_memory_map into it. Signed-off-by: Huawei Xie --- lib/librte_vhost/vhost_cuse/virtio-net-cdev.c | 258 ++++++++++++++++++++++++++ 1 file changed, 258 insertions(+) create mode 100644 lib/librte_vhost/vhost_cuse/virtio-net-cdev.c diff --git a/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c new file mode 100644 index 0000000..fbfc403 --- /dev/null +++ b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c @@ -0,0 +1,258 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "vhost-net.h" + +/* Line size for reading maps file. */ +static const uint32_t BUFSIZE = PATH_MAX; + +/* Size of prot char array in procmap. */ +#define PROT_SZ 5 + +/* Number of elements in procmap struct. */ +#define PROCMAP_SZ 8 + +/* Structure containing information gathered from maps file. */ +struct procmap { + uint64_t va_start; /* Start virtual address in file. */ + uint64_t len; /* Size of file. */ + uint64_t pgoff; /* Not used. */ + uint32_t maj; /* Not used. */ + uint32_t min; /* Not used. */ + uint32_t ino; /* Not used. */ + char prot[PROT_SZ]; /* Not used. */ + char fname[PATH_MAX]; /* File name. */ +}; + +/* + * Locate the file containing QEMU's memory space and + * map it to our address space. + */ +static int +host_memory_map(struct virtio_net *dev, struct virtio_memory *mem, + pid_t pid, uint64_t addr) +{ + struct dirent *dptr = NULL; + struct procmap procmap; + DIR *dp = NULL; + int fd; + int i; + char memfile[PATH_MAX]; + char mapfile[PATH_MAX]; + char procdir[PATH_MAX]; + char resolved_path[PATH_MAX]; + char *path = NULL; + FILE *fmap; + void *map; + uint8_t found = 0; + char line[BUFSIZE]; + char dlm[] = "- : "; + char *str, *sp, *in[PROCMAP_SZ]; + char *end = NULL; + + /* Path where mem files are located. */ + snprintf(procdir, PATH_MAX, "/proc/%u/fd/", pid); + /* Maps file used to locate mem file. */ + snprintf(mapfile, PATH_MAX, "/proc/%u/maps", pid); + + fmap = fopen(mapfile, "r"); + if (fmap == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Failed to open maps file for pid %d\n", + dev->device_fh, pid); + return -1; + } + + /* Read through maps file until we find out base_address. */ + while (fgets(line, BUFSIZE, fmap) != 0) { + str = line; + errno = 0; + /* Split line into fields. */ + for (i = 0; i < PROCMAP_SZ; i++) { + in[i] = strtok_r(str, &dlm[i], &sp); + if ((in[i] == NULL) || (errno != 0)) { + fclose(fmap); + return -1; + } + str = NULL; + } + + /* Convert/Copy each field as needed. */ + procmap.va_start = strtoull(in[0], &end, 16); + if ((in[0] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + procmap.len = strtoull(in[1], &end, 16); + if ((in[1] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + procmap.pgoff = strtoull(in[3], &end, 16); + if ((in[3] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + procmap.maj = strtoul(in[4], &end, 16); + if ((in[4] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + procmap.min = strtoul(in[5], &end, 16); + if ((in[5] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + procmap.ino = strtoul(in[6], &end, 16); + if ((in[6] == '\0') || (end == NULL) || (*end != '\0') || + (errno != 0)) { + fclose(fmap); + return -1; + } + + memcpy(&procmap.prot, in[2], PROT_SZ); + memcpy(&procmap.fname, in[7], PATH_MAX); + + if (procmap.va_start == addr) { + procmap.len = procmap.len - procmap.va_start; + found = 1; + break; + } + } + fclose(fmap); + + if (!found) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Failed to find memory file in pid %d maps file\n", + dev->device_fh, pid); + return -1; + } + + /* Find the guest memory file among the process fds. */ + dp = opendir(procdir); + if (dp == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Cannot open pid %d process directory\n", + dev->device_fh, pid); + return -1; + } + + found = 0; + + /* Read the fd directory contents. */ + while (NULL != (dptr = readdir(dp))) { + snprintf(memfile, PATH_MAX, "/proc/%u/fd/%s", + pid, dptr->d_name); + path = realpath(memfile, resolved_path); + if ((path == NULL) && (strlen(resolved_path) == 0)) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Failed to resolve fd directory\n", + dev->device_fh); + closedir(dp); + return -1; + } + if (strncmp(resolved_path, procmap.fname, + strnlen(procmap.fname, PATH_MAX)) == 0) { + found = 1; + break; + } + } + + closedir(dp); + + if (found == 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Failed to find memory file for pid %d\n", + dev->device_fh, pid); + return -1; + } + /* Open the shared memory file and map the memory into this process. */ + fd = open(memfile, O_RDWR); + + if (fd == -1) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Failed to open %s for pid %d\n", + dev->device_fh, memfile, pid); + return -1; + } + + map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE, + MAP_POPULATE|MAP_SHARED, fd, 0); + close(fd); + + if (map == MAP_FAILED) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%"PRIu64") Error mapping the file %s for pid %d\n", + dev->device_fh, memfile, pid); + return -1; + } + + /* Store the memory address and size in the device data structure */ + mem->mapped_address = (uint64_t)(uintptr_t)map; + mem->mapped_size = procmap.len; + + LOG_DEBUG(VHOST_CONFIG, + "(%"PRIu64") Mem File: %s->%s - Size: %llu - VA: %p\n", + dev->device_fh, + memfile, resolved_path, + (unsigned long long)mem->mapped_size, map); + + return 0; +} +