From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id C8561F04 for ; Thu, 28 Sep 2017 17:01:47 +0200 (CEST) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Sep 2017 08:01:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,450,1500966000"; d="scan'208";a="1176697500" Received: from irsmsx108.ger.corp.intel.com ([163.33.3.3]) by orsmga001.jf.intel.com with ESMTP; 28 Sep 2017 08:01:43 -0700 Received: from irsmsx105.ger.corp.intel.com ([169.254.7.75]) by IRSMSX108.ger.corp.intel.com ([169.254.11.167]) with mapi id 14.03.0319.002; Thu, 28 Sep 2017 16:01:42 +0100 From: "Ananyev, Konstantin" To: "Tan, Jianfeng" , "dev@dpdk.org" CC: "Richardson, Bruce" , "De Lara Guarch, Pablo" , "thomas@monjalon.net" , "yliu@fridaylinux.org" , "maxime.coquelin@redhat.com" , "mtetsuyah@gmail.com" , "Yigit, Ferruh" Thread-Topic: [PATCH v2 07/12] eal: add channel for primary/secondary communication Thread-Index: AQHTOGFiOfSMGiJbgEOBSVAx/XW0a6LKXz8Q Date: Thu, 28 Sep 2017 15:01:41 +0000 Message-ID: <2601191342CEEE43887BDE71AB9772584F24FF69@irsmsx105.ger.corp.intel.com> References: <1503654052-84730-1-git-send-email-jianfeng.tan@intel.com> <1506606959-76230-1-git-send-email-jianfeng.tan@intel.com> <1506606959-76230-8-git-send-email-jianfeng.tan@intel.com> In-Reply-To: <1506606959-76230-8-git-send-email-jianfeng.tan@intel.com> Accept-Language: en-IE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiMThmNjYxMzctYzczNi00NGFjLTgyMGQtZDViM2ZiZWMwZmZiIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE2LjUuOS4zIiwiVHJ1c3RlZExhYmVsSGFzaCI6IkNWbU1pUktNTGM5MlgydndneGNXZHF4dFJuUzlyZXdyWDJ2ZzRIZzNsM3M9In0= x-ctpclassification: CTP_IC dlp-product: dlpe-windows dlp-version: 11.0.0.116 dlp-reaction: no-action x-originating-ip: [163.33.239.182] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [dpdk-dev] [PATCH v2 07/12] eal: add channel for primary/secondary communication X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Sep 2017 15:01:48 -0000 Hi Jianfeng, > -----Original Message----- > From: Tan, Jianfeng > Sent: Thursday, September 28, 2017 2:56 PM > To: dev@dpdk.org > Cc: Richardson, Bruce ; Ananyev, Konstantin <= konstantin.ananyev@intel.com>; De Lara Guarch, Pablo > ; thomas@monjalon.net; yliu@fridaylinux.o= rg; maxime.coquelin@redhat.com; mtetsuyah@gmail.com; > Yigit, Ferruh ; Tan, Jianfeng > Subject: [PATCH v2 07/12] eal: add channel for primary/secondary communic= ation >=20 > Previouly, there is only one way for primary/secondary to exchange > messages, that is, primary process writes info into some predefind > file, and secondary process reads info out. That cannot address > the requirements: > a. Secondary wants to send info to primary, for example, secondary > would like to send request (about some specific vdev to primary). > b. Sending info at any time, instead of just initialization time. > c. Share FDs with the other side, for vdev like vhost, related FDs > (memory region, kick) should be shared. >=20 > This patch proposes to create a communication channel, as an unix > socket connection, for above requirements. Primary will listen on > the unix socket; secondary will connect this socket to talk. >=20 > Three new APIs are added: >=20 > 1. rte_eal_mp_action_register is used to register an action, > indexed by a string; if the calling component wants to > response the messages from the corresponding component in > its primary process or secondary processes. > 2. rte_eal_mp_action_unregister is used to unregister the action > if the calling component does not want to response the messages. > 3. rte_eal_mp_sendmsg is used to send a message. I think we already have similar channel in librte_pdump(). Also it seems like eal_vfio also has it's own socket to communicate between= mp/sp. Could we probably make it generic - so same code (and socket) be used by al= l such places. Konstantin >=20 > Signed-off-by: Jianfeng Tan > --- > lib/librte_eal/bsdapp/eal/rte_eal_version.map | 8 + > lib/librte_eal/common/eal_common_proc.c | 498 ++++++++++++++++++= ++++++ > lib/librte_eal/common/eal_filesystem.h | 18 + > lib/librte_eal/common/eal_private.h | 10 + > lib/librte_eal/common/include/rte_eal.h | 68 ++++ > lib/librte_eal/linuxapp/eal/eal.c | 6 + > lib/librte_eal/linuxapp/eal/rte_eal_version.map | 8 + > 7 files changed, 616 insertions(+) >=20 > diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_e= al/bsdapp/eal/rte_eal_version.map > index 47a09ea..f895916 100644 > --- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map > +++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map > @@ -238,3 +238,11 @@ EXPERIMENTAL { > rte_service_start_with_defaults; >=20 > } DPDK_17.08; > + > +EXPERIMENTAL { > + global: > + > + rte_eal_primary_secondary_add_action; > + rte_eal_primary_secondary_del_action; > + rte_eal_primary_secondary_sendmsg; > +} DPDK_17.11; > diff --git a/lib/librte_eal/common/eal_common_proc.c b/lib/librte_eal/com= mon/eal_common_proc.c > index 60526ca..eb5a502 100644 > --- a/lib/librte_eal/common/eal_common_proc.c > +++ b/lib/librte_eal/common/eal_common_proc.c > @@ -33,8 +33,21 @@ > #include > #include > #include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > #include > +#include > +#include >=20 > +#include "eal_private.h" > #include "eal_filesystem.h" > #include "eal_internal_cfg.h" >=20 > @@ -59,3 +72,488 @@ rte_eal_primary_proc_alive(const char *config_file_pa= th) >=20 > return !!ret; > } > + > +struct action_entry { > + TAILQ_ENTRY(action_entry) next; /**< Next attached action entry */ > + > +#define MAX_ACTION_NAME_LEN 64 > + char action_name[MAX_ACTION_NAME_LEN]; > + rte_eal_mp_t action; > +}; > + > +/** Double linked list of actions. */ > +TAILQ_HEAD(action_entry_list, action_entry); > + > +static struct action_entry_list action_entry_list =3D > + TAILQ_HEAD_INITIALIZER(action_entry_list); > + > +static struct action_entry * > +find_action_entry_by_name(const char *name) > +{ > + int len =3D strlen(name); > + struct action_entry *entry; > + > + TAILQ_FOREACH(entry, &action_entry_list, next) { > + if (strncmp(entry->action_name, name, len) =3D=3D 0) > + break; > + } > + > + return entry; > +} > + > +int > +rte_eal_mp_action_register(const char *action_name, rte_eal_mp_t action) > +{ > + struct action_entry *entry =3D malloc(sizeof(struct action_entry)); > + > + if (entry =3D=3D NULL) > + return -ENOMEM; > + > + if (find_action_entry_by_name(action_name) !=3D NULL) > + return -EEXIST; > + > + strncpy(entry->action_name, action_name, MAX_ACTION_NAME_LEN); > + entry->action =3D action; > + TAILQ_INSERT_TAIL(&action_entry_list, entry, next); > + return 0; > +} > + > +void > +rte_eal_mp_action_unregister(const char *name) > +{ > + struct action_entry *entry =3D find_action_entry_by_name(name); > + > + TAILQ_REMOVE(&action_entry_list, entry, next); > + free(entry); > +} > + > +/* The maximum amount of fd for one recvmsg/sendmsg */ > +#define SCM_MAX_FD 253 > +#define MAX_SECONDARY_PROCS 8 > +#define MAX_MESSAGE_LENGTH 1024 > + > +struct mp_fds { > + int efd; > + > + union { > + /* fds for primary process */ > + struct { > + int listen; > + /* fds used to send msg to secondary process(es) */ > + int secondaries[MAX_SECONDARY_PROCS]; > + }; > + > + /* fds for secondary process */ > + struct { > + /* fds used to send msg to the primary process */ > + int primary; > + }; > + }; > +}; > + > +static struct mp_fds mp_fds; > + > +struct msg_hdr { > + char action_name[MAX_ACTION_NAME_LEN]; > + int fds_num; > + int len_params; > + char params[0]; > +} __rte_packed; > + > +static int > +add_sec_proc(int fd) > +{ > + int i; > + > + for (i =3D 0; i < MAX_SECONDARY_PROCS; ++i) > + if (mp_fds.secondaries[i] =3D=3D -1) > + break; > + > + if (i >=3D MAX_SECONDARY_PROCS) > + return -1; > + > + mp_fds.secondaries[i] =3D fd; > + > + return i; > +} > + > +static void > +del_sec_proc(int fd) > +{ > + int i; > + > + for (i =3D 0; i < MAX_SECONDARY_PROCS; ++i) { > + if (mp_fds.secondaries[i] =3D=3D fd) { > + mp_fds.secondaries[i] =3D -1; > + break; > + } > + } > +} > + > +static int > +read_msg(int sockfd, char *buf, int buflen, int *fds, int fds_num) > +{ > + struct iovec iov; > + struct msghdr msgh; > + size_t fdsize =3D fds_num * sizeof(int); > + char control[CMSG_SPACE(fdsize)]; > + struct cmsghdr *cmsg; > + struct msg_hdr *hdr =3D (struct msg_hdr *)buf; > + int ret, total; > + > + /* read msg_hdr */ > + memset(&msgh, 0, sizeof(msgh)); > + iov.iov_base =3D hdr; > + iov.iov_len =3D sizeof(*hdr); > + > + msgh.msg_iov =3D &iov; > + msgh.msg_iovlen =3D 1; > + msgh.msg_control =3D control; > + msgh.msg_controllen =3D sizeof(control); > + > + ret =3D recvmsg(sockfd, &msgh, 0); > + if (ret !=3D sizeof(struct msg_hdr)) { > + RTE_LOG(ERR, EAL, "recvmsg failed\n"); > + return ret; > + } > + > + if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) { > + RTE_LOG(ERR, EAL, "truncted msg\n"); > + return -1; > + } > + total =3D ret; > + > + /* read auxiliary FDs if any */ > + for (cmsg =3D CMSG_FIRSTHDR(&msgh); cmsg !=3D NULL; > + cmsg =3D CMSG_NXTHDR(&msgh, cmsg)) { > + if ((cmsg->cmsg_level =3D=3D SOL_SOCKET) && > + (cmsg->cmsg_type =3D=3D SCM_RIGHTS)) { > + memcpy(fds, CMSG_DATA(cmsg), fdsize); > + break; > + } > + } > + > + /* read params */ > + if (hdr->len_params) { > + if (hdr->len_params > buflen - (int)sizeof(*hdr)) > + rte_exit(EXIT_FAILURE, "params too long\n"); > + > + ret =3D read(sockfd, &hdr->params, hdr->len_params); > + if (ret !=3D hdr->len_params) > + rte_exit(EXIT_FAILURE, "failed to recv params\n"); > + > + total +=3D ret; > + } > + > + RTE_LOG(INFO, EAL, "read msg: %s, %d\n", hdr->action_name, > + (int)sizeof(*hdr) + hdr->len_params); > + return total; > +} > + > +static int > +process_msg(int fd) > +{ > + int len; > + int params_len; > + char buf[MAX_MESSAGE_LENGTH]; > + int fds[SCM_MAX_FD]; > + struct msg_hdr *hdr; > + struct action_entry *entry; > + > + len =3D read_msg(fd, buf, MAX_MESSAGE_LENGTH, fds, SCM_MAX_FD); > + if (len <=3D 0) { > + RTE_LOG(ERR, EAL, "failed to read message: %s\n", > + strerror(errno)); > + return -1; > + } > + > + hdr =3D (struct msg_hdr *) buf; > + > + entry =3D find_action_entry_by_name(hdr->action_name); > + if (entry =3D=3D NULL) { > + RTE_LOG(ERR, EAL, "cannot find action by: %s\n", > + hdr->action_name); > + return -1; > + } > + > + params_len =3D len - sizeof(struct msg_hdr); > + entry->action(hdr->params, params_len, fds, hdr->fds_num); > + > + return 0; > +} > + > +static int > +add_secondary(void) > +{ > + int fd; > + struct epoll_event ev; > + > + while (1) { > + fd =3D accept(mp_fds.listen, NULL, NULL); > + if (fd < 0 && errno =3D=3D EAGAIN) > + break; > + else if (fd < 0) { > + RTE_LOG(ERR, EAL, "primary failed to accept: %s\n", > + strerror(errno)); > + return -1; > + } > + > + ev.events =3D EPOLLIN | EPOLLRDHUP; > + ev.data.fd =3D fd; > + if (epoll_ctl(mp_fds.efd, EPOLL_CTL_ADD, fd, &ev) < 0) { > + RTE_LOG(ERR, EAL, "failed to add secondary: %s\n", > + strerror(errno)); > + break; > + } > + if (add_sec_proc(fd) < 0) { > + RTE_LOG(ERR, EAL, "too many secondary processes\n"); > + close(fd); > + break; > + } > + } > + > + return 0; > +} > + > +static void * > +mp_handler(void *arg __rte_unused) > +{ > + int fd; > + int i, n; > + struct epoll_event ev; > + struct epoll_event *events; > + int is_primary =3D rte_eal_process_type() =3D=3D RTE_PROC_PRIMARY; > + > + ev.events =3D EPOLLIN | EPOLLRDHUP; > + ev.data.fd =3D (is_primary) ? mp_fds.listen : mp_fds.primary; > + if (epoll_ctl(mp_fds.efd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0) { > + RTE_LOG(ERR, EAL, "failed to epoll_ctl: %s\n", > + strerror(errno)); > + exit(EXIT_FAILURE); > + } > + > + events =3D calloc(20, sizeof ev); > + > + while (1) { > + n =3D epoll_wait(mp_fds.efd, events, 20, -1); > + for (i =3D 0; i < n; i++) { > + if (is_primary && events[i].data.fd =3D=3D mp_fds.listen) { > + if (events[i].events !=3D EPOLLIN) { > + RTE_LOG(ERR, EAL, "what happens?\n"); > + exit(EXIT_FAILURE); > + } > + > + if (add_secondary() < 0) > + break; > + > + continue; > + } > + > + fd =3D events[i].data.fd; > + > + if ((events[i].events & EPOLLIN)) { > + if (process_msg(fd) < 0) { > + RTE_LOG(ERR, EAL, > + "failed to process msg\n"); > + if (!is_primary) > + exit(EXIT_FAILURE); > + } > + continue; > + } > + > + /* EPOLLERR, EPOLLHUP, etc */ > + if (is_primary) { > + RTE_LOG(ERR, EAL, "secondary exit: %d\n", fd); > + epoll_ctl(mp_fds.efd, EPOLL_CTL_DEL, fd, NULL); > + del_sec_proc(fd); > + close(fd); > + } else { > + RTE_LOG(ERR, EAL, "primary exits, so do I\n"); > + /* Exit secondary when primary exits? */ > + exit(EXIT_FAILURE); > + } > + } > + } > + > + return NULL; > +} > + > +int > +rte_eal_mp_channel_init(void) > +{ > + int i, fd, ret; > + const char *path; > + struct sockaddr_un un; > + pthread_t tid; > + char thread_name[RTE_MAX_THREAD_NAME_LEN]; > + > + mp_fds.efd =3D epoll_create1(0); > + if (mp_fds.efd < 0) { > + RTE_LOG(ERR, EAL, "epoll_create1 failed\n"); > + return -1; > + } > + > + fd =3D socket(AF_UNIX, SOCK_STREAM, 0); > + if (fd < 0) { > + RTE_LOG(ERR, EAL, "Failed to create unix socket\n"); > + return -1; > + } > + > + memset(&un, 0, sizeof(un)); > + un.sun_family =3D AF_UNIX; > + path =3D eal_mp_unix_path(); > + strncpy(un.sun_path, path, sizeof(un.sun_path)); > + un.sun_path[sizeof(un.sun_path) - 1] =3D '\0'; > + > + if (rte_eal_process_type() =3D=3D RTE_PROC_PRIMARY) { > + for (i =3D 0; i < MAX_SECONDARY_PROCS; ++i) > + mp_fds.secondaries[i] =3D -1; > + > + if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { > + RTE_LOG(ERR, EAL, "cannot set nonblocking mode\n"); > + close(fd); > + return -1; > + } > + > + /* The file still exists since last run */ > + unlink(path); > + > + ret =3D bind(fd, (struct sockaddr *)&un, sizeof(un)); > + if (ret < 0) { > + RTE_LOG(ERR, EAL, "failed to bind to %s: %s\n", > + path, strerror(errno)); > + close(fd); > + return -1; > + } > + RTE_LOG(INFO, EAL, "primary bind to %s\n", path); > + > + ret =3D listen(fd, 1024); > + if (ret < 0) { > + RTE_LOG(ERR, EAL, "failed to listen: %s\n", > + strerror(errno)); > + close(fd); > + return -1; > + } > + mp_fds.listen =3D fd; > + } else { > + ret =3D connect(fd, (struct sockaddr *)&un, sizeof(un)); > + if (ret < 0) { > + RTE_LOG(ERR, EAL, "failed to connect primary\n"); > + return -1; > + } > + mp_fds.primary =3D fd; > + } > + > + ret =3D pthread_create(&tid, NULL, mp_handler, NULL); > + if (ret < 0) { > + RTE_LOG(ERR, EAL, "failed to create thead: %s\n", > + strerror(errno)); > + close(fd); > + close(mp_fds.efd); > + return -1; > + } > + > + snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN, > + "rte_mp_handle"); > + ret =3D rte_thread_setname(tid, thread_name); > + if (ret < 0) { > + RTE_LOG(ERR, EAL, "failed to set thead name\n"); > + close(fd); > + close(mp_fds.efd); > + return -1; > + } > + > + return 0; > +} > + > +static int > +send_msg(int fd, struct msghdr *p_msgh) > +{ > + int ret; > + > + do { > + ret =3D sendmsg(fd, p_msgh, 0); > + } while (ret < 0 && errno =3D=3D EINTR); > + > + if (ret < 0) > + RTE_LOG(ERR, EAL, "failed to send msg: %s\n", strerror(errno)); > + > + return ret; > +} > + > +int > +rte_eal_mp_sendmsg(const char *action_name, > + const void *params, > + int len_params, > + int fds[], > + int fds_num) > +{ > + int i; > + int ret =3D 0; > + struct msghdr msgh; > + struct iovec iov; > + size_t fd_size =3D fds_num * sizeof(int); > + char control[CMSG_SPACE(fd_size)]; > + struct cmsghdr *cmsg; > + struct msg_hdr *msg; > + int len_msg; > + > + if (fds_num > SCM_MAX_FD) { > + RTE_LOG(ERR, EAL, > + "Cannot send more than %d FDs\n", SCM_MAX_FD); > + return -E2BIG; > + } > + > + len_msg =3D sizeof(struct msg_hdr) + len_params; > + if (len_msg > MAX_MESSAGE_LENGTH) { > + RTE_LOG(ERR, EAL, "Message is too long\n"); > + return -ENOMEM; > + } > + > + RTE_LOG(INFO, EAL, "send msg: %s, %d\n", action_name, len_msg); > + > + msg =3D malloc(len_msg); > + if (!msg) { > + RTE_LOG(ERR, EAL, "Cannot alloc memory for msg\n"); > + return -ENOMEM; > + } > + memset(msg, 0, len_msg); > + strcpy(msg->action_name, action_name); > + msg->fds_num =3D fds_num; > + msg->len_params =3D len_params; > + memcpy(msg->params, params, len_params); > + > + memset(&msgh, 0, sizeof(msgh)); > + memset(control, 0, sizeof(control)); > + > + iov.iov_base =3D (uint8_t *)msg; > + iov.iov_len =3D len_msg; > + > + msgh.msg_iov =3D &iov; > + msgh.msg_iovlen =3D 1; > + msgh.msg_control =3D control; > + msgh.msg_controllen =3D sizeof(control); > + > + cmsg =3D CMSG_FIRSTHDR(&msgh); > + cmsg->cmsg_len =3D CMSG_LEN(fd_size); > + cmsg->cmsg_level =3D SOL_SOCKET; > + cmsg->cmsg_type =3D SCM_RIGHTS; > + memcpy(CMSG_DATA(cmsg), fds, fd_size); > + > + if (rte_eal_process_type() =3D=3D RTE_PROC_PRIMARY) { > + for (i =3D 0; i < MAX_SECONDARY_PROCS; ++i) { > + if (mp_fds.secondaries[i] =3D=3D -1) > + continue; > + > + ret =3D send_msg(mp_fds.secondaries[i], &msgh); > + if (ret < 0) > + break; > + } > + } else { > + ret =3D send_msg(mp_fds.primary, &msgh); > + } > + > + free(msg); > + > + return ret; > +} > diff --git a/lib/librte_eal/common/eal_filesystem.h b/lib/librte_eal/comm= on/eal_filesystem.h > index 8acbd99..3d9514f 100644 > --- a/lib/librte_eal/common/eal_filesystem.h > +++ b/lib/librte_eal/common/eal_filesystem.h > @@ -67,6 +67,24 @@ eal_runtime_config_path(void) > return buffer; > } >=20 > +/** Path of primary/secondary communication unix socket file. */ > +#define MP_UNIX_PATH_FMT "%s/.%s_unix" > +static inline const char * > +eal_mp_unix_path(void) > +{ > + static char buffer[PATH_MAX]; /* static so auto-zeroed */ > + const char *directory =3D default_config_dir; > + const char *home_dir =3D getenv("HOME"); > + > + if (getuid() !=3D 0 && home_dir !=3D NULL) > + directory =3D home_dir; > + snprintf(buffer, sizeof(buffer) - 1, MP_UNIX_PATH_FMT, > + directory, internal_config.hugefile_prefix); > + > + return buffer; > + > +} > + > /** Path of hugepage info file. */ > #define HUGEPAGE_INFO_FMT "%s/.%s_hugepage_info" >=20 > diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/= eal_private.h > index 597d82e..7fbfbdf 100644 > --- a/lib/librte_eal/common/eal_private.h > +++ b/lib/librte_eal/common/eal_private.h > @@ -355,4 +355,14 @@ bool rte_eal_using_phys_addrs(void); > */ > struct rte_bus *rte_bus_find_by_device_name(const char *str); >=20 > +/** > + * Create the unix channel for primary/secondary communication. > + * > + * @return > + * 0 on success; > + * (<0) on failure. > + */ > + > +int rte_eal_mp_channel_init(void); > + > #endif /* _EAL_PRIVATE_H_ */ > diff --git a/lib/librte_eal/common/include/rte_eal.h b/lib/librte_eal/com= mon/include/rte_eal.h > index 0e7363d..4e3d4d2 100644 > --- a/lib/librte_eal/common/include/rte_eal.h > +++ b/lib/librte_eal/common/include/rte_eal.h > @@ -210,6 +210,74 @@ int rte_eal_init(int argc, char **argv); > int rte_eal_primary_proc_alive(const char *config_file_path); >=20 > /** > + * Action function typedef used by other components. > + * > + * As we create unix socket channel for primary/secondary communication,= use > + * this function typedef to register action for coming messages. > + */ > +typedef int (*rte_eal_mp_t)(const void *params, int len, > + int fds[], int fds_num); > +/** > + * Register an action function for primary/secondary communication. > + * > + * Call this function to register an action, if the calling component wa= nts > + * to response the messages from the corresponding component in its prim= ary > + * process or secondary processes. > + * > + * @param action_name > + * The action_name argument plays as the nonredundant key to find the = action. > + * > + * @param action > + * The action argument is the function pointer to the action function. > + * > + * @return > + * - 0 on success. > + * - (<0) on failure. > + */ > +int rte_eal_mp_action_register(const char *action_name, rte_eal_mp_t act= ion); > +/** > + * Unregister an action function for primary/secondary communication. > + * > + * Call this function to unregister an action if the calling component = does > + * not want to response the messages from the corresponding component in= its > + * primary process or secondary processes. > + * > + * @param action_name > + * The action_name argument plays as the nonredundant key to find the = action. > + * > + */ > +void rte_eal_mp_action_unregister(const char *name); > + > +/** > + * Send a message to the primary process or the secondary processes. > + * > + * This function will send a message which will be responsed by the acti= on > + * identified by action_name of the process on the other side. > + * > + * @param action_name > + * The action_name argument is used to identify which action will be u= sed. > + * > + * @param params > + * The params argument contains the customized message. > + * > + * @param len_params > + * The len_params argument is the length of the customized message. > + * > + * @param fds > + * The fds argument is an array of fds sent with sendmsg. > + * > + * @param fds_num > + * The fds_num argument is number of fds to be sent with sendmsg. > + * > + * @return > + * - (>=3D0) on success. > + * - (<0) on failure. > + */ > +int > +rte_eal_mp_sendmsg(const char *action_name, const void *params, > + int len_params, int fds[], int fds_num); > + > +/** > * Usage function typedef used by the application usage function. > * > * Use this function typedef to define and call rte_set_applcation_usage= _hook() > diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/= eal/eal.c > index 48f12f4..4b491b9 100644 > --- a/lib/librte_eal/linuxapp/eal/eal.c > +++ b/lib/librte_eal/linuxapp/eal/eal.c > @@ -873,6 +873,12 @@ rte_eal_init(int argc, char **argv) >=20 > eal_check_mem_on_local_socket(); >=20 > + if (rte_eal_mp_channel_init() < 0) { > + rte_eal_init_alert("failed to init mp channel\n"); > + rte_errno =3D EFAULT; > + return -1; > + } > + > if (eal_plugins_init() < 0) > rte_eal_init_alert("Cannot init plugins\n"); >=20 > diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte= _eal/linuxapp/eal/rte_eal_version.map > index 8c08b8d..2e1d0e5 100644 > --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map > +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map > @@ -243,3 +243,11 @@ EXPERIMENTAL { > rte_service_start_with_defaults; >=20 > } DPDK_17.08; > + > +EXPERIMENTAL { > + global: > + > + rte_eal_primary_secondary_add_action; > + rte_eal_primary_secondary_del_action; > + rte_eal_primary_secondary_sendmsg; > +} DPDK_17.11; > -- > 2.7.4