> Subject: [PATCH 05/11] bus/vmbus: open subchannels
>
> [You don't often get email from srikant...@oneconvergence.com. Learn
> why this is important at http://aka.ms/LearnAboutSenderIdentification.]
>
> 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
>
> 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 | 8 +++++++
> 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, 56 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..9e91ed9907 100644
> --- a/drivers/bus/vmbus/linux/vmbus_uio.c
> +++ b/drivers/bus/vmbus/linux/vmbus_uio.c
> @@ -451,3 +451,11 @@ 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) {
> + RTE_SET_USED(dev);
> + RTE_SET_USED(subchan);
> + return 0;
> +}
If this function ever gets called in Linux and it doesn't do anything, should
it return a failure?
> 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 4cf73ce815..42d13c5705 100644
> --- a/drivers/bus/vmbus/rte_bus_vmbus.h
> +++ b/drivers/bus/vmbus/rte_bus_vmbus.h
> @@ -405,6 +405,16 @@ 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)
> --
> 2.30.2
