[dpdk-dev] [PATCH V13 2/3] eal: add uevent pass and process function

Jeff Guo jia.guo at intel.com
Thu Jan 25 15:46:05 CET 2018


In order to handle the uevent which have been detected from the kernel
side, add uevent process function, let hot plug event to be example to
show uevent mechanism how to pass the uevent and process the uevent.

About uevent passing and processing, add below functions in linux eal
dev layer. FreeBSD not support uevent ,so let it to be void and do not
implement in function.
a.dev_uev_parse
b.dev_uev_receive
c.dev_uev_process

Signed-off-by: Jeff Guo <jia.guo at intel.com>
Reviewed-by: Jingjing Wu <jingjing.wu at intel.com>
---
v13->v12:
fix some event parse issue
---
 lib/librte_eal/common/include/rte_dev.h |  16 +++++
 lib/librte_eal/linuxapp/eal/eal_dev.c   | 105 +++++++++++++++++++++++++++++++-
 2 files changed, 119 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index 88fbb2d..9396a9f 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -52,6 +52,22 @@ extern "C" {
 #include <rte_config.h>
 #include <rte_log.h>
 
+#define RTE_EAL_UEV_MSG_LEN 4096
+#define RTE_EAL_UEV_MSG_ELEM_LEN 128
+
+enum rte_dev_state {
+	RTE_DEV_UNDEFINED,	/**< unknown device state */
+	RTE_DEV_FAULT,	/**< device fault or error */
+	RTE_DEV_PARSED,	/**< device has been scanned on bus*/
+	RTE_DEV_PROBED,	/**< device has been probed driver  */
+};
+
+enum rte_dev_event_subsystem {
+	RTE_DEV_EVENT_SUBSYSTEM_UIO,
+	RTE_DEV_EVENT_SUBSYSTEM_VFIO,
+	RTE_DEV_EVENT_SUBSYSTEM_MAX
+};
+
 /**
  * The device event type.
  */
diff --git a/lib/librte_eal/linuxapp/eal/eal_dev.c b/lib/librte_eal/linuxapp/eal/eal_dev.c
index 72371c9..9dda195 100644
--- a/lib/librte_eal/linuxapp/eal/eal_dev.c
+++ b/lib/librte_eal/linuxapp/eal/eal_dev.c
@@ -79,10 +79,111 @@ dev_monitor_enable(int netlink_fd)
 	return -1;
 }
 
+static void
+dev_uev_parse(const char *buf, struct rte_dev_event *event)
+{
+	char action[RTE_EAL_UEV_MSG_ELEM_LEN];
+	char subsystem[RTE_EAL_UEV_MSG_ELEM_LEN];
+	char dev_path[RTE_EAL_UEV_MSG_ELEM_LEN];
+	char pci_slot_name[RTE_EAL_UEV_MSG_ELEM_LEN];
+	int i = 0;
+
+	memset(action, 0, RTE_EAL_UEV_MSG_ELEM_LEN);
+	memset(subsystem, 0, RTE_EAL_UEV_MSG_ELEM_LEN);
+	memset(dev_path, 0, RTE_EAL_UEV_MSG_ELEM_LEN);
+	memset(pci_slot_name, 0, RTE_EAL_UEV_MSG_ELEM_LEN);
+
+	while (i < RTE_EAL_UEV_MSG_LEN) {
+		for (; i < RTE_EAL_UEV_MSG_LEN; i++) {
+			if (*buf)
+				break;
+			buf++;
+		}
+
+		if (!strncmp(buf, "ACTION=", 7)) {
+			buf += 7;
+			i += 7;
+			snprintf(action, sizeof(action), "%s", buf);
+		} else if (!strncmp(buf, "DEVPATH=", 8)) {
+			buf += 8;
+			i += 8;
+			snprintf(dev_path, sizeof(dev_path), "%s", buf);
+		} else if (!strncmp(buf, "SUBSYSTEM=", 10)) {
+			buf += 10;
+			i += 10;
+			snprintf(subsystem, sizeof(subsystem), "%s", buf);
+		} else if (!strncmp(buf, "PCI_SLOT_NAME=", 14)) {
+			buf += 14;
+			i += 14;
+			snprintf(pci_slot_name, sizeof(subsystem), "%s", buf);
+		}
+		for (; i < RTE_EAL_UEV_MSG_LEN; i++) {
+			if (*buf == '\0')
+				break;
+			buf++;
+		}
+	}
+
+
+	if ((!strncmp(subsystem, "uio", 3)) ||
+		(!strncmp(subsystem, "pci", 3))) {
+		event->subsystem = RTE_DEV_EVENT_SUBSYSTEM_UIO;
+		if (!strncmp(action, "add", 3))
+			event->type = RTE_DEV_EVENT_ADD;
+		if (!strncmp(action, "remove", 6))
+			event->type = RTE_DEV_EVENT_REMOVE;
+		event->devname = pci_slot_name;
+	}
+}
+
+static int
+dev_uev_receive(int fd, struct rte_dev_event *uevent)
+{
+	int ret;
+	char buf[RTE_EAL_UEV_MSG_LEN];
+
+	memset(uevent, 0, sizeof(struct rte_dev_event));
+	memset(buf, 0, RTE_EAL_UEV_MSG_LEN);
+
+	ret = recv(fd, buf, RTE_EAL_UEV_MSG_LEN - 1, MSG_DONTWAIT);
+	if (ret < 0) {
+		RTE_LOG(ERR, EAL,
+		"Socket read error(%d): %s\n",
+		errno, strerror(errno));
+		return -1;
+	} else if (ret == 0)
+		/* connection closed */
+		return -1;
+
+	dev_uev_parse(buf, uevent);
+
+	return 0;
+}
+
 static int
-dev_uev_process(__rte_unused struct epoll_event *events, __rte_unused int nfds)
+dev_uev_process(struct epoll_event *events, int nfds)
 {
-	/* TODO: device uevent processing */
+	struct rte_dev_event uevent;
+	int i;
+
+	for (i = 0; i < nfds; i++) {
+		if (dev_uev_receive(events[i].data.fd, &uevent))
+			return 0;
+
+		/* default handle all pci devcie when is being hot plug */
+		if (uevent.subsystem == RTE_DEV_EVENT_SUBSYSTEM_UIO &&
+			uevent.devname) {
+			if (uevent.type == RTE_DEV_EVENT_REMOVE) {
+				return(_rte_dev_callback_process(
+					uevent.devname,
+					RTE_DEV_EVENT_REMOVE, NULL));
+			} else if (uevent.type == RTE_DEV_EVENT_ADD) {
+				return(_rte_dev_callback_process(
+					uevent.devname,
+					RTE_DEV_EVENT_ADD, NULL));
+			}
+		}
+	}
 	return 0;
 }
 
-- 
2.7.4



More information about the dev mailing list