From patchwork Sat Feb 17 18:03:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saurabh Singh Sengar X-Patchwork-Id: 202661 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:693c:2685:b0:108:e6aa:91d0 with SMTP id mn5csp444221dyc; Sat, 17 Feb 2024 10:06:04 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCUAsK4pPW6QwY37JzjvAGt5lr6IOb1mR9pC6T3iabsi7i5XlIh6SfwV4xQCTiReOQTaWAsgY5e4jErh5Av4AJWUt2lJzQ== X-Google-Smtp-Source: AGHT+IHlRD6Y/cNolTQI70yZALEz/uAUbzy9L1uk5sgVsEaywU6eR+4Ps3deiaQkPgjH2q4t40Cg X-Received: by 2002:a05:6808:a85:b0:3bf:d85c:b39b with SMTP id q5-20020a0568080a8500b003bfd85cb39bmr9197176oij.15.1708193164044; Sat, 17 Feb 2024 10:06:04 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1708193164; cv=pass; d=google.com; s=arc-20160816; b=wVLkCMVQMNfNHF5ZRoz3ZEXGYC8Aalmz4smaeHc4ApzHAn0X+ZqvOT+6W0HpP5Ck0Y ZlSStX3fua7fZZ73nTdKA7tRhNJ4z7VyZ6F+SHHDz59dayZftLx8ghF7UYb64nibWuJc G1oLTa56PvzkYT5ScbsnDUoJuvlX+Vpm89JSUijD0yGo0zvJBNghr/v8uetBNFa6/OQs 4SSHD0ykaq6+VaZh6YCtChulS4B2j1k7T/s8IwsWy6gk/9m9cna2pUUPIJA6oVKZ5Dxh wuWK8qaUVOVppvt0lVx+uEQnt7utkkPpjvngrjSGDPpU1KDH2sLCCcUx/zzbetIAn5oH NzBA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-id:precedence:references :in-reply-to:message-id:date:subject:cc:to:from:dkim-signature :dkim-filter; bh=MRXVp3YA7yWA2T84Hd3tEiVADcMqix8kDbIqH3OmHDo=; fh=/g2YaKiPj+3FPE7qve5VOLtb1iRxoth7NZi+8r+O0Q0=; b=TccWGO5I6WmcIrI+RJE7zjFrJnLiVVW3SN0R6Lgx6xwxTITjci2i3XD06rg0sXIJFN jf7Fb56FrdDsyV4g1UxV5hmHiRvlTzGKhGiPp+cL9h1+amxIVylTSdb7oTtxA7uA5/2b YEAvnDdVPiCnR9kRY3BQZ0fUvdQTaoA2S7NVFoZxbM2y0pnudw2sp8J1MeYvwMATbU0z AKGE/3QYIDDGP5Lq31S31utW5TgOUBFaYVeZZ5NtJO7U6o9GaNePTXcpD/pvX44Jvcc1 h+eSBgCTbAklw6JbD2Nt/NfJY74fLH2afAUzRfzWHNr9unyBTFxdpx5kimeqvx9md3MM bxcA==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=ejZdU5Fx; arc=pass (i=1 spf=pass spfdomain=linux.microsoft.com dkim=pass dkdomain=linux.microsoft.com dmarc=pass fromdomain=linux.microsoft.com); spf=pass (google.com: domain of linux-kernel+bounces-69997-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-69997-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. [147.75.199.223]) by mx.google.com with ESMTPS id h5-20020a05622a170500b0042e0076283asi579089qtk.308.2024.02.17.10.06.03 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Feb 2024 10:06:04 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-69997-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=ejZdU5Fx; arc=pass (i=1 spf=pass spfdomain=linux.microsoft.com dkim=pass dkdomain=linux.microsoft.com dmarc=pass fromdomain=linux.microsoft.com); spf=pass (google.com: domain of linux-kernel+bounces-69997-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-69997-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id B2AA51C20C6C for ; Sat, 17 Feb 2024 18:06:03 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3CE0D7E0EE; Sat, 17 Feb 2024 18:04:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="ejZdU5Fx" Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5034F7E0F8; Sat, 17 Feb 2024 18:04:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708193077; cv=none; b=jPhRwi/R5ETac9Qjq1scRqWqai9EYtwhVd7HHCQHmzLxgDBJRueGZsFud3cFqD9QwNaHfK28YT6l1RzRd+BYpzBKajKaPn5dLYrp1ILBB185SdCw7wfggZnNKSY2AXIjAzoC4knfM6vhslIjsuV8uUM5EqdV9s3JhzHwRWzdt1w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708193077; c=relaxed/simple; bh=+rxgmxFlK5uw5wfQ1cB11w6cuZ2D0QxWkvur5AbTD/w=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=XwRINiBRouL9IAx1hqYD08Zn1ymjs0q257AgMe/t2fMQxvnRISxGGMeFMkwE7KyCfxd2iU+qulWFPFKG0YHo5dkl6w9LX7fsrm3gs/AF5bE7uI3kxI81X9LoQqunB7Rm1gFeY1GV/zAhecCIeUw8zuedYIHjzdoK6CeHXsVU2hA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=ejZdU5Fx; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id CD5BB207FD4A; Sat, 17 Feb 2024 10:04:27 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com CD5BB207FD4A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1708193067; bh=MRXVp3YA7yWA2T84Hd3tEiVADcMqix8kDbIqH3OmHDo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ejZdU5FxL38DR8Pi5A9IaCcRnGf8XkJcNMTp4S28B4rlUWyqst8coPhpXl717YKrX RkPB8/BrJLtwLPRRu1oKCbMuarjU6kfN+pPQceIWgnxWu4309XvGt/wf9o1wz3n9my oC5GSEFMHZ2dfUMZlcAByAXHkVNv1FW33u9cO0Qg= From: Saurabh Sengar To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, gregkh@linuxfoundation.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ssengar@microsoft.com Subject: [PATCH 5/6] tools: hv: Add new fcopy application based on uio driver Date: Sat, 17 Feb 2024 10:03:39 -0800 Message-Id: <1708193020-14740-6-git-send-email-ssengar@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com> References: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791170354929016864 X-GMAIL-MSGID: 1791170354929016864 New fcopy application which utilizes uio_hv_vmbus_client driver Signed-off-by: Saurabh Sengar --- tools/hv/Build | 3 +- tools/hv/Makefile | 10 +- tools/hv/hv_fcopy_uio_daemon.c | 488 +++++++++++++++++++++++++++++++++ 3 files changed, 495 insertions(+), 6 deletions(-) create mode 100644 tools/hv/hv_fcopy_uio_daemon.c diff --git a/tools/hv/Build b/tools/hv/Build index 6cf51fa4b306..7d1f1698069b 100644 --- a/tools/hv/Build +++ b/tools/hv/Build @@ -1,3 +1,4 @@ hv_kvp_daemon-y += hv_kvp_daemon.o hv_vss_daemon-y += hv_vss_daemon.o -hv_fcopy_daemon-y += hv_fcopy_daemon.o +hv_fcopy_uio_daemon-y += hv_fcopy_uio_daemon.o +hv_fcopy_uio_daemon-y += vmbus_bufring.o diff --git a/tools/hv/Makefile b/tools/hv/Makefile index fe770e679ae8..944180cf916e 100644 --- a/tools/hv/Makefile +++ b/tools/hv/Makefile @@ -17,7 +17,7 @@ MAKEFLAGS += -r override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include -ALL_TARGETS := hv_kvp_daemon hv_vss_daemon hv_fcopy_daemon +ALL_TARGETS := hv_kvp_daemon hv_vss_daemon hv_fcopy_uio_daemon ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS)) ALL_SCRIPTS := hv_get_dhcp_info.sh hv_get_dns_info.sh hv_set_ifconfig.sh @@ -39,10 +39,10 @@ $(HV_VSS_DAEMON_IN): FORCE $(OUTPUT)hv_vss_daemon: $(HV_VSS_DAEMON_IN) $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@ -HV_FCOPY_DAEMON_IN := $(OUTPUT)hv_fcopy_daemon-in.o -$(HV_FCOPY_DAEMON_IN): FORCE - $(Q)$(MAKE) $(build)=hv_fcopy_daemon -$(OUTPUT)hv_fcopy_daemon: $(HV_FCOPY_DAEMON_IN) +HV_FCOPY_UIO_DAEMON_IN := $(OUTPUT)hv_fcopy_uio_daemon-in.o +$(HV_FCOPY_UIO_DAEMON_IN): FORCE + $(Q)$(MAKE) $(build)=hv_fcopy_uio_daemon +$(OUTPUT)hv_fcopy_uio_daemon: $(HV_FCOPY_UIO_DAEMON_IN) $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@ clean: diff --git a/tools/hv/hv_fcopy_uio_daemon.c b/tools/hv/hv_fcopy_uio_daemon.c new file mode 100644 index 000000000000..f72c899328fc --- /dev/null +++ b/tools/hv/hv_fcopy_uio_daemon.c @@ -0,0 +1,488 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * An implementation of host to guest copy functionality for Linux. + * + * Copyright (C) 2023, Microsoft, Inc. + * + * Author : K. Y. Srinivasan + * Author : Saurabh Sengar + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "vmbus_bufring.h" + +#define ICMSGTYPE_NEGOTIATE 0 +#define ICMSGTYPE_FCOPY 7 + +#define WIN8_SRV_MAJOR 1 +#define WIN8_SRV_MINOR 1 +#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) + +#define MAX_FOLDER_NAME 15 +#define MAX_PATH_LEN 15 +#define FCOPY_UIO "/sys/bus/vmbus/devices/eb765408-105f-49b6-b4aa-c123b64d17d4/uio" + +#define FCOPY_VER_COUNT 1 +static const int fcopy_versions[] = { + WIN8_SRV_VERSION +}; + +#define FW_VER_COUNT 1 +static const int fw_versions[] = { + UTIL_FW_VERSION +}; + +#define HV_RING_SIZE (4 * 4096) + +unsigned char desc[HV_RING_SIZE]; + +static int target_fd; +static char target_fname[PATH_MAX]; +static unsigned long long filesize; + +static int hv_fcopy_create_file(char *file_name, char *path_name, __u32 flags) +{ + int error = HV_E_FAIL; + char *q, *p; + + filesize = 0; + p = (char *)path_name; + snprintf(target_fname, sizeof(target_fname), "%s/%s", + (char *)path_name, (char *)file_name); + + /* + * Check to see if the path is already in place; if not, + * create if required. + */ + while ((q = strchr(p, '/')) != NULL) { + if (q == p) { + p++; + continue; + } + *q = '\0'; + if (access(path_name, F_OK)) { + if (flags & CREATE_PATH) { + if (mkdir(path_name, 0755)) { + syslog(LOG_ERR, "Failed to create %s", + path_name); + goto done; + } + } else { + syslog(LOG_ERR, "Invalid path: %s", path_name); + goto done; + } + } + p = q + 1; + *q = '/'; + } + + if (!access(target_fname, F_OK)) { + syslog(LOG_INFO, "File: %s exists", target_fname); + if (!(flags & OVER_WRITE)) { + error = HV_ERROR_ALREADY_EXISTS; + goto done; + } + } + + target_fd = open(target_fname, + O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744); + if (target_fd == -1) { + syslog(LOG_INFO, "Open Failed: %s", strerror(errno)); + goto done; + } + + error = 0; +done: + if (error) + target_fname[0] = '\0'; + return error; +} + +/* copy the data into the file */ +static int hv_copy_data(struct hv_do_fcopy *cpmsg) +{ + ssize_t len; + int ret = 0; + + len = pwrite(target_fd, cpmsg->data, cpmsg->size, cpmsg->offset); + + filesize += cpmsg->size; + if (len != cpmsg->size) { + switch (errno) { + case ENOSPC: + ret = HV_ERROR_DISK_FULL; + break; + default: + ret = HV_E_FAIL; + break; + } + syslog(LOG_ERR, "pwrite failed to write %llu bytes: %ld (%s)", + filesize, (long)len, strerror(errno)); + } + + return ret; +} + +static int hv_copy_finished(void) +{ + close(target_fd); + target_fname[0] = '\0'; + + return 0; +} + +static void print_usage(char *argv[]) +{ + fprintf(stderr, "Usage: %s [options]\n" + "Options are:\n" + " -n, --no-daemon stay in foreground, don't daemonize\n" + " -h, --help print this help\n", argv[0]); +} + +static bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, unsigned char *buf, + unsigned int buflen, const int *fw_version, int fw_vercnt, + const int *srv_version, int srv_vercnt, + int *nego_fw_version, int *nego_srv_version) +{ + int icframe_major, icframe_minor; + int icmsg_major, icmsg_minor; + int fw_major, fw_minor; + int srv_major, srv_minor; + int i, j; + bool found_match = false; + struct icmsg_negotiate *negop; + + /* Check that there's enough space for icframe_vercnt, icmsg_vercnt */ + if (buflen < ICMSG_HDR + offsetof(struct icmsg_negotiate, reserved)) { + syslog(LOG_ERR, "Invalid icmsg negotiate"); + return false; + } + + icmsghdrp->icmsgsize = 0x10; + negop = (struct icmsg_negotiate *)&buf[ICMSG_HDR]; + + icframe_major = negop->icframe_vercnt; + icframe_minor = 0; + + icmsg_major = negop->icmsg_vercnt; + icmsg_minor = 0; + + /* Validate negop packet */ + if (icframe_major > IC_VERSION_NEGOTIATION_MAX_VER_COUNT || + icmsg_major > IC_VERSION_NEGOTIATION_MAX_VER_COUNT || + ICMSG_NEGOTIATE_PKT_SIZE(icframe_major, icmsg_major) > buflen) { + syslog(LOG_ERR, "Invalid icmsg negotiate - icframe_major: %u, icmsg_major: %u\n", + icframe_major, icmsg_major); + goto fw_error; + } + + /* + * Select the framework version number we will + * support. + */ + + for (i = 0; i < fw_vercnt; i++) { + fw_major = (fw_version[i] >> 16); + fw_minor = (fw_version[i] & 0xFFFF); + + for (j = 0; j < negop->icframe_vercnt; j++) { + if (negop->icversion_data[j].major == fw_major && + negop->icversion_data[j].minor == fw_minor) { + icframe_major = negop->icversion_data[j].major; + icframe_minor = negop->icversion_data[j].minor; + found_match = true; + break; + } + } + + if (found_match) + break; + } + + if (!found_match) + goto fw_error; + + found_match = false; + + for (i = 0; i < srv_vercnt; i++) { + srv_major = (srv_version[i] >> 16); + srv_minor = (srv_version[i] & 0xFFFF); + + for (j = negop->icframe_vercnt; + (j < negop->icframe_vercnt + negop->icmsg_vercnt); + j++) { + if (negop->icversion_data[j].major == srv_major && + negop->icversion_data[j].minor == srv_minor) { + icmsg_major = negop->icversion_data[j].major; + icmsg_minor = negop->icversion_data[j].minor; + found_match = true; + break; + } + } + + if (found_match) + break; + } + + /* + * Respond with the framework and service + * version numbers we can support. + */ +fw_error: + if (!found_match) { + negop->icframe_vercnt = 0; + negop->icmsg_vercnt = 0; + } else { + negop->icframe_vercnt = 1; + negop->icmsg_vercnt = 1; + } + + if (nego_fw_version) + *nego_fw_version = (icframe_major << 16) | icframe_minor; + + if (nego_srv_version) + *nego_srv_version = (icmsg_major << 16) | icmsg_minor; + + negop->icversion_data[0].major = icframe_major; + negop->icversion_data[0].minor = icframe_minor; + negop->icversion_data[1].major = icmsg_major; + negop->icversion_data[1].minor = icmsg_minor; + + return found_match; +} + +static void wcstoutf8(char *dest, const __u16 *src, size_t dest_size) +{ + size_t len = 0; + + while (len < dest_size) { + if (src[len] < 0x80) + dest[len++] = (char)(*src++); + else + dest[len++] = 'X'; + } + + dest[len] = '\0'; +} + +static int hv_fcopy_start(struct hv_start_fcopy *smsg_in) +{ + setlocale(LC_ALL, "en_US.utf8"); + size_t file_size, path_size; + char *file_name, *path_name; + char *in_file_name = (char *)smsg_in->file_name; + char *in_path_name = (char *)smsg_in->path_name; + + file_size = wcstombs(NULL, (const wchar_t *restrict)in_file_name, 0) + 1; + path_size = wcstombs(NULL, (const wchar_t *restrict)in_path_name, 0) + 1; + + file_name = (char *)malloc(file_size * sizeof(char)); + path_name = (char *)malloc(path_size * sizeof(char)); + + wcstoutf8(file_name, (__u16 *)in_file_name, file_size); + wcstoutf8(path_name, (__u16 *)in_path_name, path_size); + + return hv_fcopy_create_file(file_name, path_name, smsg_in->copy_flags); +} + +static int hv_fcopy_send_data(struct hv_fcopy_hdr *fcopy_msg, int recvlen) +{ + int operation = fcopy_msg->operation; + + /* + * The strings sent from the host are encoded in + * utf16; convert it to utf8 strings. + * The host assures us that the utf16 strings will not exceed + * the max lengths specified. We will however, reserve room + * for the string terminating character - in the utf16s_utf8s() + * function we limit the size of the buffer where the converted + * string is placed to W_MAX_PATH -1 to guarantee + * that the strings can be properly terminated! + */ + + switch (operation) { + case START_FILE_COPY: + return hv_fcopy_start((struct hv_start_fcopy *)fcopy_msg); + case WRITE_TO_FILE: + return hv_copy_data((struct hv_do_fcopy *)fcopy_msg); + case COMPLETE_FCOPY: + return hv_copy_finished(); + } + + return HV_E_FAIL; +} + +/* process the packet recv from host */ +static int fcopy_pkt_process(struct vmbus_br *txbr) +{ + int ret, offset, pktlen; + int fcopy_srv_version; + const struct vmbus_chanpkt_hdr *pkt; + struct hv_fcopy_hdr *fcopy_msg; + struct icmsg_hdr *icmsghdr; + + pkt = (const struct vmbus_chanpkt_hdr *)desc; + offset = pkt->hlen << 3; + pktlen = (pkt->tlen << 3) - offset; + icmsghdr = (struct icmsg_hdr *)&desc[offset + sizeof(struct vmbuspipe_hdr)]; + icmsghdr->status = HV_E_FAIL; + + if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) { + if (vmbus_prep_negotiate_resp(icmsghdr, desc + offset, pktlen, fw_versions, + FW_VER_COUNT, fcopy_versions, FCOPY_VER_COUNT, + NULL, &fcopy_srv_version)) { + syslog(LOG_INFO, "FCopy IC version %d.%d", + fcopy_srv_version >> 16, fcopy_srv_version & 0xFFFF); + icmsghdr->status = 0; + } + } else if (icmsghdr->icmsgtype == ICMSGTYPE_FCOPY) { + /* Ensure recvlen is big enough to contain hv_fcopy_hdr */ + if (pktlen < ICMSG_HDR + sizeof(struct hv_fcopy_hdr)) { + syslog(LOG_ERR, "Invalid Fcopy hdr. Packet length too small: %u", + pktlen); + return -ENOBUFS; + } + + fcopy_msg = (struct hv_fcopy_hdr *)&desc[offset + ICMSG_HDR]; + icmsghdr->status = hv_fcopy_send_data(fcopy_msg, pktlen); + } + + icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; + ret = rte_vmbus_chan_send(txbr, 0x6, desc + offset, pktlen, 0); + if (ret) { + syslog(LOG_ERR, "Write to ringbuffer failed err: %d", ret); + return ret; + } + + return 0; +} + +static void fcopy_get_first_folder(char *path, char *chan_no) +{ + DIR *dir = opendir(path); + struct dirent *entry; + + if (!dir) { + syslog(LOG_ERR, "Failed to open directory (errno=%s).\n", strerror(errno)); + return; + } + + while ((entry = readdir(dir)) != NULL) { + if (entry->d_type == DT_DIR && strcmp(entry->d_name, ".") != 0 && + strcmp(entry->d_name, "..") != 0) { + strcpy(chan_no, entry->d_name); + break; + } + } + + closedir(dir); +} + +int main(int argc, char *argv[]) +{ + int fcopy_fd = -1, tmp = 1; + int daemonize = 1, long_index = 0, opt, ret = -EINVAL; + struct vmbus_br txbr, rxbr; + void *ring; + uint32_t len = HV_RING_SIZE; + char uio_name[MAX_FOLDER_NAME] = {0}; + char uio_dev_path[MAX_PATH_LEN] = {0}; + + static struct option long_options[] = { + {"help", no_argument, 0, 'h' }, + {"no-daemon", no_argument, 0, 'n' }, + {0, 0, 0, 0 } + }; + + while ((opt = getopt_long(argc, argv, "hn", long_options, + &long_index)) != -1) { + switch (opt) { + case 'n': + daemonize = 0; + break; + case 'h': + default: + print_usage(argv); + goto exit; + } + } + + if (daemonize && daemon(1, 0)) { + syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno)); + goto exit; + } + + openlog("HV_UIO_FCOPY", 0, LOG_USER); + syslog(LOG_INFO, "starting; pid is:%d", getpid()); + + fcopy_get_first_folder(FCOPY_UIO, uio_name); + snprintf(uio_dev_path, sizeof(uio_dev_path), "/dev/%s", uio_name); + fcopy_fd = open(uio_dev_path, O_RDWR); + + if (fcopy_fd < 0) { + syslog(LOG_ERR, "open %s failed; error: %d %s", + uio_dev_path, errno, strerror(errno)); + ret = fcopy_fd; + goto exit; + } + + ring = vmbus_uio_map(&fcopy_fd, HV_RING_SIZE); + if (!ring) { + ret = errno; + syslog(LOG_ERR, "mmap ringbuffer failed; error: %d %s", ret, strerror(ret)); + goto close; + } + vmbus_br_setup(&txbr, ring, HV_RING_SIZE); + vmbus_br_setup(&rxbr, (char *)ring + HV_RING_SIZE, HV_RING_SIZE); + + while (1) { + /* + * In this loop we process fcopy messages after the + * handshake is complete. + */ + ret = pread(fcopy_fd, &tmp, sizeof(int), 0); + if (ret < 0) { + syslog(LOG_ERR, "pread failed: %s", strerror(errno)); + continue; + } + + len = HV_RING_SIZE; + ret = rte_vmbus_chan_recv_raw(&rxbr, desc, &len); + if (unlikely(ret <= 0)) { + /* This indicates a failure to communicate (or worse) */ + syslog(LOG_ERR, "VMBus channel recv error: %d", ret); + } else { + ret = fcopy_pkt_process(&txbr); + if (ret < 0) + goto close; + + /* Signal host */ + if ((write(fcopy_fd, &tmp, sizeof(int))) != sizeof(int)) { + ret = errno; + syslog(LOG_ERR, "Registration failed: %s\n", strerror(ret)); + goto close; + } + } + } +close: + close(fcopy_fd); +exit: + return ret; +}