[dpdk-dev] [PATCH v4 1/2] eal: add uevent monitor for hot plug

Jeff Guo jia.guo at intel.com
Sun Sep 3 17:49:44 CEST 2017


This patch aim to add a general uevent mechanism in eal device layer,
to enable all kernel object hot plug monitoring, so user could use these
API to monitor and read out the device status info sent from the kernel
side, then corresponding to handle it, such as detach or attach the
device, and even benefit to use it for do smoothly fail safe work.

1) About uevent monitoring:
a: add uevent_fd in struct rte_intr_handle, and use eal interrupt
   epolling to monitoring the netlink of uevent_fd.
b: add enum of rte_eal_uevent_type and struct of rte_eal_uevent.
c: add below API in rte eal device layer.
   rte_eal_uev_fd_new
   rte_eal_uev_enable
   rte_eal_uev_receive
   rte_eal_uev_callback_register
   rte_eal_uev_callback_unregister

2) About uevent handler and failure handler, use pci uio for example,
add below API to process it:
   pci_uio_uev_handler
   pci_uio_remap_resource
   pci_map_private_resource

Signed-off-by: Jeff Guo <jia.guo at intel.com>
---
v4->v3:
move uevent monitor api from eal interrupt to eal device layer.
create uevent type and struct in eal device.
move uevent handler for each driver to eal layer.
add uevent failure handler to process signal fault issue.
add example for request and use uevent monitoring in testpmd.
---
 lib/librte_eal/common/eal_common_dev.c             | 248 ++++++++++++++++++++-
 lib/librte_eal/common/eal_common_pci.c             |  20 ++
 lib/librte_eal/common/eal_private.h                |  14 ++
 lib/librte_eal/common/include/rte_dev.h            | 136 +++++++++++
 lib/librte_eal/common/include/rte_pci.h            |  17 ++
 lib/librte_eal/linuxapp/eal/eal_interrupts.c       |  28 ++-
 lib/librte_eal/linuxapp/eal/eal_pci_init.h         |   4 +
 lib/librte_eal/linuxapp/eal/eal_pci_uio.c          |  62 ++++++
 .../linuxapp/eal/include/exec-env/rte_interrupts.h |   2 +-
 9 files changed, 524 insertions(+), 7 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index f98302d..ae8f673 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -36,15 +36,41 @@
 #include <string.h>
 #include <inttypes.h>
 #include <sys/queue.h>
-
+#include <sys/signalfd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+
+#include <rte_malloc.h>
 #include <rte_bus.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
 #include <rte_debug.h>
 #include <rte_log.h>
+#include <rte_spinlock.h>
 
 #include "eal_private.h"
 
+/* spinlock for uevent callbacks */
+static rte_spinlock_t rte_eal_uev_cb_lock = RTE_SPINLOCK_INITIALIZER;
+
+/**
+ * The user application callback description.
+ *
+ * It contains callback address to be registered by user application,
+ * the pointer to the parameters for callback, and the event type.
+ */
+struct rte_eal_uev_callback {
+	TAILQ_ENTRY(rte_eal_uev_callback) next; /**< Callbacks list */
+	rte_eal_uev_cb_fn cb_fn;                /**< Callback address */
+	void *cb_arg;                           /**< Parameter for callback */
+	void *ret_param;                        /**< Return parameter */
+	enum rte_eal_uevent_type event;          /**< Interrupt event type */
+	uint32_t active;                        /**< Callback is executing */
+};
+
 static int cmp_detached_dev_name(const struct rte_device *dev,
 	const void *_name)
 {
@@ -244,3 +270,223 @@ int rte_eal_hotplug_remove(const char *busname, const char *devname)
 	rte_eal_devargs_remove(busname, devname);
 	return ret;
 }
+
+int
+rte_eal_uev_fd_new(void)
+{
+
+	int netlink_fd = -1;
+
+	netlink_fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+	if (netlink_fd < 0)
+		return -1;
+
+	return netlink_fd;
+}
+
+int
+rte_eal_uev_enable(int netlink_fd)
+{
+	struct sockaddr_nl addr;
+	int ret;
+	int size = 64 * 1024;
+	int nonblock = 1;
+	memset(&addr, 0, sizeof(addr));
+	addr.nl_family = AF_NETLINK;
+	addr.nl_pid = 0;
+	addr.nl_groups = 0xffffffff;
+
+	setsockopt(netlink_fd, SOL_SOCKET, SO_RCVBUFFORCE, &size, sizeof(size));
+
+	ret = ioctl(netlink_fd, FIONBIO, &nonblock);
+	if (ret != 0) {
+		RTE_LOG(ERR, EAL,
+		"ioctl(FIONBIO) failed\n");
+		close(netlink_fd);
+		return -1;
+	}
+
+	if (bind(netlink_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+		close(netlink_fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+rte_eal_uev_parse(const char *buf, struct rte_eal_uevent *event)
+{
+	char action[RTE_EAL_UEVENT_MSG_LEN];
+	char subsystem[RTE_EAL_UEVENT_MSG_LEN];
+	char dev_path[RTE_EAL_UEVENT_MSG_LEN];
+	int i = 0;
+
+	memset(action, 0, RTE_EAL_UEVENT_MSG_LEN);
+	memset(subsystem, 0, RTE_EAL_UEVENT_MSG_LEN);
+	memset(dev_path, 0, RTE_EAL_UEVENT_MSG_LEN);
+
+	while (i < RTE_EAL_UEVENT_MSG_LEN) {
+		for (; i < RTE_EAL_UEVENT_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);
+		}
+		for (; i < RTE_EAL_UEVENT_MSG_LEN; i++) {
+			if (*buf == '\0')
+				break;
+			buf++;
+		}
+	}
+
+	if ((!strncmp(subsystem, "uio", 3)) ||
+		(!strncmp(subsystem, "pci", 3))) {
+		event->subsystem = RTE_EAL_UEVENT_SUBSYSTEM_UIO;
+		if (!strncmp(action, "add", 3))
+			event->type = RTE_EAL_UEVENT_ADD;
+		if (!strncmp(action, "remove", 6))
+			event->type = RTE_EAL_UEVENT_REMOVE;
+		return 0;
+	}
+
+	return -1;
+}
+
+int
+rte_eal_uev_receive(int fd, struct rte_eal_uevent *uevent)
+{
+	int ret;
+	char buf[RTE_EAL_UEVENT_MSG_LEN];
+
+	memset(uevent, 0, sizeof(struct rte_eal_uevent));
+	memset(buf, 0, RTE_EAL_UEVENT_MSG_LEN);
+
+	ret = recv(fd, buf, RTE_EAL_UEVENT_MSG_LEN - 1, MSG_DONTWAIT);
+	if (ret > 0)
+		return rte_eal_uev_parse(buf, uevent);
+	else if (ret < 0) {
+		RTE_LOG(ERR, EAL,
+		"Socket read error(%d): %s\n",
+		errno, strerror(errno));
+		return -1;
+	} else
+		/* connection closed */
+		return -1;
+}
+
+int
+rte_eal_uev_callback_register(struct rte_device *dev,
+			enum rte_eal_uevent_type event,
+			rte_eal_uev_cb_fn cb_fn, void *cb_arg)
+{
+	struct rte_eal_uev_callback *user_cb;
+
+	if (!cb_fn)
+		return -EINVAL;
+
+	rte_spinlock_lock(&rte_eal_uev_cb_lock);
+
+	TAILQ_FOREACH(user_cb, &(dev->uev_cbs), next) {
+		if (user_cb->cb_fn == cb_fn &&
+			user_cb->cb_arg == cb_arg &&
+			user_cb->event == event) {
+			break;
+		}
+	}
+
+	/* create a new callback. */
+	if (user_cb == NULL) {
+		user_cb = rte_zmalloc("EAL_UEV_CALLBACK",
+					sizeof(struct rte_eal_uev_callback), 0);
+		if (user_cb != NULL) {
+			user_cb->cb_fn = cb_fn;
+			user_cb->cb_arg = cb_arg;
+			user_cb->event = event;
+			TAILQ_INSERT_TAIL(&(dev->uev_cbs), user_cb, next);
+		}
+	}
+
+	rte_spinlock_unlock(&rte_eal_uev_cb_lock);
+	return (user_cb == NULL) ? -ENOMEM : 0;
+}
+
+int
+rte_eal_uev_callback_unregister(struct rte_device *dev,
+			enum rte_eal_uevent_type event,
+			rte_eal_uev_cb_fn cb_fn, void *cb_arg)
+{
+	int ret;
+	struct rte_eal_uev_callback *cb, *next;
+
+	if (!cb_fn)
+		return -EINVAL;
+
+	rte_spinlock_lock(&rte_eal_uev_cb_lock);
+
+	ret = 0;
+	for (cb = TAILQ_FIRST(&dev->uev_cbs); cb != NULL; cb = next) {
+
+		next = TAILQ_NEXT(cb, next);
+
+		if (cb->cb_fn != cb_fn || cb->event != event ||
+				(cb->cb_arg != (void *)-1 &&
+				cb->cb_arg != cb_arg))
+			continue;
+
+		/*
+		 * if this callback is not executing right now,
+		 * then remove it.
+		 */
+		if (cb->active == 0) {
+			TAILQ_REMOVE(&(dev->uev_cbs), cb, next);
+			rte_free(cb);
+		} else {
+			ret = -EAGAIN;
+		}
+	}
+
+	rte_spinlock_unlock(&rte_eal_uev_cb_lock);
+	return ret;
+}
+
+int
+_rte_eal_uev_callback_process(struct rte_device *dev,
+	enum rte_eal_uevent_type event, void *cb_arg, void *ret_param)
+{
+	struct rte_eal_uev_callback *cb_lst;
+	struct rte_eal_uev_callback dev_cb;
+	int rc = 0;
+
+	rte_spinlock_lock(&rte_eal_uev_cb_lock);
+	TAILQ_FOREACH(cb_lst, &(dev->uev_cbs), next) {
+		if (cb_lst->cb_fn == NULL || cb_lst->event != event)
+			continue;
+		dev_cb = *cb_lst;
+		cb_lst->active = 1;
+		if (cb_arg != NULL)
+			dev_cb.cb_arg = cb_arg;
+		if (ret_param != NULL)
+			dev_cb.ret_param = ret_param;
+
+		rte_spinlock_unlock(&rte_eal_uev_cb_lock);
+		rc = dev_cb.cb_fn(dev, dev_cb.event,
+				dev_cb.cb_arg, dev_cb.ret_param);
+		rte_spinlock_lock(&rte_eal_uev_cb_lock);
+		cb_lst->active = 0;
+	}
+	rte_spinlock_unlock(&rte_eal_uev_cb_lock);
+	return rc;
+}
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 52fd38c..0d640bc 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -110,6 +110,26 @@ pci_name_set(struct rte_pci_device *dev)
 		dev->device.name = dev->name;
 }
 
+/* map a private resource from an address*/
+void *
+pci_map_private_resource(void *requested_addr, off_t offset, size_t size)
+{
+	void *mapaddr;
+
+	mapaddr = mmap(requested_addr, size,
+			   PROT_READ | PROT_WRITE,
+			   MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
+	if (mapaddr == MAP_FAILED) {
+		RTE_LOG(ERR, EAL, "%s(): cannot mmap(%p, 0x%lx, 0x%lx): %s (%p)\n",
+			__func__, requested_addr,
+			(unsigned long)size, (unsigned long)offset,
+			strerror(errno), mapaddr);
+	} else
+		RTE_LOG(DEBUG, EAL, "  PCI memory mapped at %p\n", mapaddr);
+
+	return mapaddr;
+}
+
 /* map a particular resource from a file */
 void *
 pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 597d82e..8f5e283 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -192,6 +192,8 @@ int pci_uio_map_resource(struct rte_pci_device *dev);
  */
 void pci_uio_unmap_resource(struct rte_pci_device *dev);
 
+void pci_uio_uev_handler(void *parm);
+
 /**
  * Allocate uio resource for PCI device
  *
@@ -222,6 +224,18 @@ void pci_uio_free_resource(struct rte_pci_device *dev,
 		struct mapped_pci_resource *uio_res);
 
 /**
+ * remap the pci uio resource..
+ *
+ * @param dev
+ *   Point to the struct rte pci device.
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int
+pci_uio_remap_resource(struct rte_pci_device *dev);
+
+/**
  * Map device memory to uio resource
  *
  * This function is private to EAL.
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index 5386d3a..656023e 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -52,6 +52,13 @@ extern "C" {
 #include <rte_config.h>
 #include <rte_log.h>
 
+struct rte_device;
+
+struct rte_eal_uev_callback;
+/** @internal Structure to keep track of registered callbacks */
+TAILQ_HEAD(rte_eal_uev_cb_list, rte_eal_uev_callback);
+
+
 __attribute__((format(printf, 2, 0)))
 static inline void
 rte_pmd_debug_trace(const char *func_name, const char *fmt, ...)
@@ -163,6 +170,8 @@ struct rte_device {
 	const struct rte_driver *driver;/**< Associated driver */
 	int numa_node;                /**< NUMA node connection */
 	struct rte_devargs *devargs;  /**< Device user arguments */
+	/** User application callbacks for device uevent monitoring  */
+	struct rte_eal_uev_cb_list uev_cbs;
 };
 
 /**
@@ -246,6 +255,133 @@ int rte_eal_hotplug_add(const char *busname, const char *devname,
  */
 int rte_eal_hotplug_remove(const char *busname, const char *devname);
 
+#define RTE_EAL_UEVENT_MSG_LEN 4096
+#define RTE_EAL_UEVENT_SUBSYSTEM_UIO 1
+#define RTE_EAL_UEVENT_SUBSYSTEM_VFIO 2
+
+/**
+ * The eth device event type for interrupt, and maybe others in the future.
+ */
+enum rte_eal_uevent_type {
+	RTE_EAL_UEVENT_UNKNOWN,  /**< unknown event type */
+	RTE_EAL_UEVENT_ADD, /**< lsc interrupt event */
+	RTE_EAL_UEVENT_REMOVE,
+				/**< queue state event (enabled/disabled) */
+	RTE_EAL_UEVENT_CHANGE,
+			/**< reset interrupt event, sent to VF on PF reset */
+	RTE_EAL_UEVENT_MOVE,  /**< message from the VF received by PF */
+	RTE_EAL_UEVENT_ONLINE,   /**< MACsec offload related event */
+	RTE_EAL_UEVENT_OFFLINE, /**< device removal event */
+	RTE_EAL_UEVENT_MAX       /**< max value of this enum */
+};
+
+struct rte_eal_uevent {
+	enum rte_eal_uevent_type type;	/**< uevent action type */
+	int subsystem;				/**< subsystem id */
+};
+
+/**
+ * create  the device uevent file descriptor.
+ * @return
+ *   - On success, the device uevent fd.
+ *   - On failure, a negative value.
+ */
+int
+rte_eal_uev_fd_new(void);
+
+/**
+ * Bind  the netlink to enable  uevent receiving.
+ *
+ * @param fd
+ *   The fd which the uevent associated to
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int
+rte_eal_uev_enable(int fd);
+
+/**
+ * It read out the uevent from the specific file descriptor.
+ *
+ * @param fd
+ *   The fd which the uevent associated to
+ * @param uevent
+ *   Pointer to the uevent which read from the monitoring fd.
+ * @return
+ *   - On success, zero.
+ *   - On failure, a negative value.
+ */
+int
+rte_eal_uev_receive(int fd, struct rte_eal_uevent *uevent);
+
+typedef int (*rte_eal_uev_cb_fn)(struct rte_device *dev,
+		enum rte_eal_uevent_type event, void *cb_arg, void *ret_param);
+/**< user application callback to be registered for interrupts */
+
+/**
+ * Register a callback function for specific device..
+ *
+ * @param dev
+ *  Pointer to struct rte_device.
+ * @param event
+ *  Uevent interested.
+ * @param cb_fn
+ *  User supplied callback function to be called.
+ * @param cb_arg
+ *  Pointer to the parameters for the registered callback.
+ *
+ * @return
+ *  - On success, zero.
+ *  - On failure, a negative value.
+ */
+int rte_eal_uev_callback_register(struct rte_device *dev,
+			enum rte_eal_uevent_type event,
+			rte_eal_uev_cb_fn cb_fn, void *cb_arg);
+
+/**
+ * Unregister a callback function for specific device.
+ *
+ * @param device
+ *  Pointer to struct rte_device.
+ * @param event
+ *  Uevent interested.
+ * @param cb_fn
+ *  User supplied callback function to be called.
+ * @param cb_arg
+ *  Pointer to the parameters for the registered callback. -1 means to
+ *  remove all for the same callback address and same event.
+ *
+ * @return
+ *  - On success, zero.
+ *  - On failure, a negative value.
+ */
+int rte_eal_uev_callback_unregister(struct rte_device *dev,
+			enum rte_eal_uevent_type event,
+		rte_eal_uev_cb_fn cb_fn, void *cb_arg);
+
+/**
+ * @internal Executes all the user application registered callbacks for
+ * the specific device. It is for DPDK internal user only. User
+ * application should not call it directly.
+ *
+ * @param dev
+ *  Pointer to struct rte_device.
+ * @param event
+ *  rte device uevent type.
+ * @param cb_arg
+ *  callback parameter.
+ * @param ret_param
+ *  To pass data back to user application.
+ *  This allows the user application to decide if a particular function
+ *  is permitted or not.
+ *
+ * @return
+ *  int
+ */
+int _rte_eal_uev_callback_process(struct rte_device *dev,
+		enum rte_eal_uevent_type event, void *cb_arg, void *ret_param);
+
 /**
  * Device comparison function.
  *
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 8b12339..d3ced27 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -394,6 +394,23 @@ void rte_pci_unmap_device(struct rte_pci_device *dev);
 
 /**
  * @internal
+ * Map to a particular private resource.
+ *
+ * @param requested_addr
+ *      The starting address for the new mapping range.
+ * @param offset
+ *      The offset for the mapping range.
+ * @param size
+ *      The size for the mapping range.
+ * @return
+ *   - On success, the function returns a pointer to the mapped area.
+ *   - On error, the value MAP_FAILED is returned.
+ */
+void *pci_map_private_resource(void *requested_addr, off_t offset,
+		size_t size);
+
+/**
+ * @internal
  * Map a particular resource from a file.
  *
  * @param requested_addr
diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index 3e9ac41..06cbdab 100644
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -670,11 +670,16 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 			RTE_SET_USED(r);
 			return -1;
 		}
+
 		rte_spinlock_lock(&intr_lock);
-		TAILQ_FOREACH(src, &intr_sources, next)
+		TAILQ_FOREACH(src, &intr_sources, next) {
 			if (src->intr_handle.fd ==
 					events[n].data.fd)
 				break;
+			else if (src->intr_handle.uevent_fd ==
+					events[n].data.fd)
+				break;
+		}
 		if (src == NULL){
 			rte_spinlock_unlock(&intr_lock);
 			continue;
@@ -736,17 +741,13 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 		rte_spinlock_lock(&intr_lock);
 
 		if (call) {
-
 			/* Finally, call all callbacks. */
 			TAILQ_FOREACH(cb, &src->callbacks, next) {
-
 				/* make a copy and unlock. */
 				active_cb = *cb;
 				rte_spinlock_unlock(&intr_lock);
-
 				/* call the actual callback */
 				active_cb.cb_fn(active_cb.cb_arg);
-
 				/*get the lock back. */
 				rte_spinlock_lock(&intr_lock);
 			}
@@ -859,7 +860,24 @@ eal_intr_thread_main(__rte_unused void *arg)
 			}
 			else
 				numfds++;
+
+			/**
+			 * add device uevent file descriptor
+			 * into wait list for uevent monitoring.
+			 */
+			ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
+			ev.data.fd = src->intr_handle.uevent_fd;
+			if (epoll_ctl(pfd, EPOLL_CTL_ADD,
+					src->intr_handle.uevent_fd, &ev) < 0){
+				rte_panic("Error adding uevent_fd %d epoll_ctl"
+					", %s\n",
+					src->intr_handle.uevent_fd,
+					strerror(errno));
+			} else
+				numfds++;
 		}
+
+
 		rte_spinlock_unlock(&intr_lock);
 		/* serve the interrupt */
 		eal_intr_handle_interrupts(pfd, numfds);
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_init.h b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
index ae2980d..2f040b4 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_init.h
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
@@ -52,10 +52,14 @@ void *pci_find_max_end_va(void);
 int pci_parse_one_sysfs_resource(char *line, size_t len, uint64_t *phys_addr,
 	uint64_t *end_addr, uint64_t *flags);
 
+void pci_uio_uev_handler(void *param);
 int pci_uio_alloc_resource(struct rte_pci_device *dev,
 		struct mapped_pci_resource **uio_res);
 void pci_uio_free_resource(struct rte_pci_device *dev,
 		struct mapped_pci_resource *uio_res);
+
+int pci_uio_remap_resource(struct rte_pci_device *dev);
+
 int pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
 		struct mapped_pci_resource *uio_res, int map_idx);
 
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
index fa10329..c85eb6c 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -231,6 +231,10 @@ pci_uio_free_resource(struct rte_pci_device *dev,
 		close(dev->intr_handle.uio_cfg_fd);
 		dev->intr_handle.uio_cfg_fd = -1;
 	}
+	if (dev->intr_handle.uevent_fd >= 0) {
+		close(dev->intr_handle.uevent_fd);
+		dev->intr_handle.uevent_fd = -1;
+	}
 	if (dev->intr_handle.fd >= 0) {
 		close(dev->intr_handle.fd);
 		dev->intr_handle.fd = -1;
@@ -239,6 +243,53 @@ pci_uio_free_resource(struct rte_pci_device *dev,
 }
 
 int
+pci_uio_remap_resource(struct rte_pci_device *dev)
+{
+	int i;
+	uint64_t phaddr;
+	void *map_address;
+
+		/* Map all BARs */
+		for (i = 0; i != PCI_MAX_RESOURCE; i++) {
+			/* skip empty BAR */
+			phaddr = dev->mem_resource[i].phys_addr;
+			if (phaddr == 0)
+				continue;
+			map_address = pci_map_private_resource(dev->mem_resource[i].addr, 0,
+					(size_t)dev->mem_resource[i].len);
+			if (map_address == MAP_FAILED)
+				goto error;
+			memset(map_address, 0xFF, (size_t)dev->mem_resource[i].len);
+			dev->mem_resource[i].addr = map_address;
+		}
+
+	return 0;
+error:
+	return -1;
+}
+
+void
+pci_uio_uev_handler(void *param)
+{
+
+	struct rte_pci_device *dev = (struct rte_pci_device *)param;
+	struct rte_eal_uevent event;
+	int ret;
+
+	/* check device uevent */
+	if (rte_eal_uev_receive(dev->intr_handle.uevent_fd, &event) == 0) {
+		if (event.subsystem == RTE_EAL_UEVENT_SUBSYSTEM_UIO) {
+			if (event.type == RTE_EAL_UEVENT_REMOVE) {
+				/*remap the resource to be fake before removal processing */
+				ret = pci_uio_remap_resource(dev);
+				if (!ret)
+					_rte_eal_uev_callback_process(&dev->device, RTE_EAL_UEVENT_REMOVE, NULL, NULL);
+			}
+		}
+	}
+}
+
+int
 pci_uio_alloc_resource(struct rte_pci_device *dev,
 		struct mapped_pci_resource **uio_res)
 {
@@ -246,6 +297,7 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
 	char cfgname[PATH_MAX];
 	char devname[PATH_MAX]; /* contains the /dev/uioX */
 	int uio_num;
+	struct rte_intr_handle *intr_handle;
 	struct rte_pci_addr *loc;
 
 	loc = &dev->addr;
@@ -276,6 +328,16 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
 		goto error;
 	}
 
+	dev->intr_handle.uevent_fd = rte_eal_uev_fd_new();
+	intr_handle = &dev->intr_handle;
+
+	rte_eal_uev_enable(intr_handle->uevent_fd);
+	TAILQ_INIT(&(dev->device.uev_cbs));
+
+	/* register callback func to eal lib */
+	rte_intr_callback_register(intr_handle,
+				   pci_uio_uev_handler, dev);
+
 	if (dev->kdrv == RTE_KDRV_IGB_UIO)
 		dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
 	else {
diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
index 6daffeb..8c7fce4 100644
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
@@ -90,6 +90,7 @@ struct rte_intr_handle {
 					for uio_pci_generic */
 	};
 	int fd;	 /**< interrupt event file descriptor */
+	int uevent_fd;	 /**< uevent file descriptor */
 	enum rte_intr_handle_type type;  /**< handle type */
 	uint32_t max_intr;             /**< max interrupt requested */
 	uint32_t nb_efd;               /**< number of available efd(event fd) */
@@ -235,5 +236,4 @@ rte_intr_allow_others(struct rte_intr_handle *intr_handle);
  */
 int
 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle);
-
 #endif /* _RTE_LINUXAPP_INTERRUPTS_H_ */
-- 
2.7.4



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