In FreeBSD, unlike Linux there is no sub-channel open callback that
could be called by HV_UIO driver, upon their grant by the hypervisor.
Thus, the PMD makes an IOCTL to the HV_UIO to open the granted
sub-channels
v2 - Added comment in linux/vmbus_uio.c
Signed-off-by: Srikanth Kaka <srikant...@oneconvergence.com>
Signed-off-by: Vag Singh <vag.si...@oneconvergence.com>
Signed-off-by: Anand Thulasiram <av...@juniper.net>
---
drivers/bus/vmbus/freebsd/vmbus_uio.c | 31 +++++++++++++++++++++++++++
drivers/bus/vmbus/linux/vmbus_uio.c | 12 +++++++++++
drivers/bus/vmbus/private.h | 1 +
drivers/bus/vmbus/rte_bus_vmbus.h | 10 +++++++++
drivers/bus/vmbus/version.map | 1 +
drivers/bus/vmbus/vmbus_channel.c | 5 +++++
6 files changed, 60 insertions(+)
diff --git a/drivers/bus/vmbus/freebsd/vmbus_uio.c
b/drivers/bus/vmbus/freebsd/vmbus_uio.c
index fdd37dac3a..022ac85302 100644
--- a/drivers/bus/vmbus/freebsd/vmbus_uio.c
+++ b/drivers/bus/vmbus/freebsd/vmbus_uio.c
@@ -12,6 +12,7 @@
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/sysctl.h>
+#include <sys/ioctl.h>
#include <rte_log.h>
#include <rte_bus.h>
@@ -26,6 +27,9 @@
/** Pathname of VMBUS devices directory. */
#define SYSFS_VMBUS_DEVICES "/sys/bus/vmbus/devices"
+/* ioctl */
+#define HVIOOPENSUBCHAN _IOW('h', 14, uint32_t)
+
const char *driver_name = "hv_uio";
static void *vmbus_map_addr;
@@ -515,3 +519,30 @@ int vmbus_uio_get_subchan(struct vmbus_channel *primary,
closedir(chan_dir);
return err;
}
+
+int vmbus_uio_subchan_open(struct rte_vmbus_device *dev, uint32_t subchan)
+{
+ struct mapped_vmbus_resource *uio_res;
+ int fd, err = 0;
+
+ uio_res = vmbus_uio_find_resource(dev);
+ if (!uio_res) {
+ VMBUS_LOG(ERR, "cannot find uio resource");
+ return -EINVAL;
+ }
+
+ fd = open(uio_res->path, O_RDWR);
+ if (fd < 0) {
+ VMBUS_LOG(ERR, "Cannot open %s: %s",
+ uio_res->path, strerror(errno));
+ return -1;
+ }
+
+ if (ioctl(fd, HVIOOPENSUBCHAN, &subchan)) {
+ VMBUS_LOG(ERR, "open subchan ioctl failed %s: %s",
+ uio_res->path, strerror(errno));
+ err = -1;
+ }
+ close(fd);
+ return err;
+}
diff --git a/drivers/bus/vmbus/linux/vmbus_uio.c
b/drivers/bus/vmbus/linux/vmbus_uio.c
index b52ca5bf1d..29e889347a 100644
--- a/drivers/bus/vmbus/linux/vmbus_uio.c
+++ b/drivers/bus/vmbus/linux/vmbus_uio.c
@@ -451,3 +451,15 @@ int vmbus_uio_get_subchan(struct vmbus_channel *primary,
closedir(chan_dir);
return err;
}
+
+/*
+ * This is a stub function and it should always succeed.
+ * The Linux UIO kernel driver opens the subchannels implicitly.
+ */
+int vmbus_uio_subchan_open(struct rte_vmbus_device *dev,
+ uint32_t subchan)
+{
+ RTE_SET_USED(dev);
+ RTE_SET_USED(subchan);
+ return 0;
+}
diff --git a/drivers/bus/vmbus/private.h b/drivers/bus/vmbus/private.h
index 528d60a42f..968f0b6f23 100644
--- a/drivers/bus/vmbus/private.h
+++ b/drivers/bus/vmbus/private.h
@@ -107,6 +107,7 @@ int vmbus_uio_get_subchan(struct vmbus_channel *primary,
int vmbus_uio_map_rings(struct vmbus_channel *chan);
int vmbus_uio_map_secondary_subchan(const struct rte_vmbus_device *dev,
const struct vmbus_channel *chan);
+int vmbus_uio_subchan_open(struct rte_vmbus_device *device, uint32_t subchan);
void vmbus_br_setup(struct vmbus_br *br, void *buf, unsigned int blen);
diff --git a/drivers/bus/vmbus/rte_bus_vmbus.h
b/drivers/bus/vmbus/rte_bus_vmbus.h
index 6bcff66468..60c5812706 100644
--- a/drivers/bus/vmbus/rte_bus_vmbus.h
+++ b/drivers/bus/vmbus/rte_bus_vmbus.h
@@ -404,6 +404,16 @@ void rte_vmbus_chan_dump(FILE *f, const struct
vmbus_channel *chan);
*/
void rte_vmbus_unregister(struct rte_vmbus_driver *driver);
+/**
+ * Perform IOCTL to VMBUS device
+ *
+ * @param device
+ * A pointer to a rte_vmbus_device structure
+ * @param subchan
+ * Count of subchannels to open
+ */
+int rte_vmbus_ioctl(struct rte_vmbus_device *device, uint32_t subchan);
+
/** Helper for VMBUS device registration from driver instance */
#define RTE_PMD_REGISTER_VMBUS(nm, vmbus_drv) \
RTE_INIT(vmbusinitfn_ ##nm) \
diff --git a/drivers/bus/vmbus/version.map b/drivers/bus/vmbus/version.map
index 3cadec7fae..3509d4fc14 100644
--- a/drivers/bus/vmbus/version.map
+++ b/drivers/bus/vmbus/version.map
@@ -23,6 +23,7 @@ DPDK_22 {
rte_vmbus_subchan_open;
rte_vmbus_unmap_device;
rte_vmbus_unregister;
+ rte_vmbus_ioctl;
local: *;
};
diff --git a/drivers/bus/vmbus/vmbus_channel.c
b/drivers/bus/vmbus/vmbus_channel.c
index f67f1c438a..f53a1b6511 100644
--- a/drivers/bus/vmbus/vmbus_channel.c
+++ b/drivers/bus/vmbus/vmbus_channel.c
@@ -367,6 +367,11 @@ int rte_vmbus_max_channels(const struct rte_vmbus_device
*device)
return 1;
}
+int rte_vmbus_ioctl(struct rte_vmbus_device *device, uint32_t subchan)
+{
+ return vmbus_uio_subchan_open(device, subchan);
+}
+
/* Setup secondary channel */
int rte_vmbus_subchan_open(struct vmbus_channel *primary,
struct vmbus_channel **new_chan)
--
2.30.1
