Re: [dpdk-dev] [PATCH v2 2/8] crypto/bcmfs: add vfio support

[Vikas Gupta <vikas.gupta@broadcom.com>]

Hi Akhil,

On Tue, Sep 29, 2020 at 12:30 AM Akhil Goyal <akhil.goyal@nxp.com> wrote:
>
> Hi Vikas,
>
> > Subject: [PATCH v2 2/8] crypto/bcmfs: add vfio support
> >
> > Add vfio support for device.
> >
> > Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
> > Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
> > Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
> > ---
> >  drivers/crypto/bcmfs/bcmfs_device.c |   5 ++
> >  drivers/crypto/bcmfs/bcmfs_device.h |   6 ++
> >  drivers/crypto/bcmfs/bcmfs_vfio.c   | 107 ++++++++++++++++++++++++++++
> >  drivers/crypto/bcmfs/bcmfs_vfio.h   |  17 +++++
> >  drivers/crypto/bcmfs/meson.build    |   3 +-
> >  5 files changed, 137 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/crypto/bcmfs/bcmfs_vfio.c
> >  create mode 100644 drivers/crypto/bcmfs/bcmfs_vfio.h
> >
> > diff --git a/drivers/crypto/bcmfs/bcmfs_device.c
> > b/drivers/crypto/bcmfs/bcmfs_device.c
> > index 47c776de6..3b5cc9e98 100644
> > --- a/drivers/crypto/bcmfs/bcmfs_device.c
> > +++ b/drivers/crypto/bcmfs/bcmfs_device.c
> > @@ -11,6 +11,7 @@
> >
> >  #include "bcmfs_device.h"
> >  #include "bcmfs_logs.h"
> > +#include "bcmfs_vfio.h"
> >
> >  struct bcmfs_device_attr {
> >       const char name[BCMFS_MAX_PATH_LEN];
> > @@ -71,6 +72,10 @@ fsdev_allocate_one_dev(struct rte_vdev_device *vdev,
> >
> >       fsdev->vdev = vdev;
> >
> > +     /* attach to VFIO */
> > +     if (bcmfs_attach_vfio(fsdev))
> > +             goto cleanup;
> > +
> >       TAILQ_INSERT_TAIL(&fsdev_list, fsdev, next);
> >
> >       return fsdev;
> > diff --git a/drivers/crypto/bcmfs/bcmfs_device.h
> > b/drivers/crypto/bcmfs/bcmfs_device.h
> > index cc64a8df2..c41cc0031 100644
> > --- a/drivers/crypto/bcmfs/bcmfs_device.h
> > +++ b/drivers/crypto/bcmfs/bcmfs_device.h
> > @@ -35,6 +35,12 @@ struct bcmfs_device {
> >       char name[BCMFS_DEV_NAME_LEN];
> >       /* Parent vdev */
> >       struct rte_vdev_device *vdev;
> > +     /* vfio handle */
> > +     int vfio_dev_fd;
> > +     /* mapped address */
> > +     uint8_t *mmap_addr;
> > +     /* mapped size */
> > +     uint32_t mmap_size;
> >  };
> >
> >  #endif /* _BCMFS_DEV_H_ */
> > diff --git a/drivers/crypto/bcmfs/bcmfs_vfio.c
> > b/drivers/crypto/bcmfs/bcmfs_vfio.c
> > new file mode 100644
> > index 000000000..dc2def580
> > --- /dev/null
> > +++ b/drivers/crypto/bcmfs/bcmfs_vfio.c
> > @@ -0,0 +1,107 @@
> > +/* SPDX-License-Identifier: BSD-3-Clause
> > + * Copyright(C) 2020 Broadcom.
> > + * All rights reserved.
> > + */
> > +
> > +#include <errno.h>
> > +#include <sys/mman.h>
> > +#include <sys/ioctl.h>
> > +
> > +#include <rte_vfio.h>
> > +
> > +#include "bcmfs_device.h"
> > +#include "bcmfs_logs.h"
> > +#include "bcmfs_vfio.h"
> > +
> > +#ifdef VFIO_PRESENT
>
> I cannot see VFIO_PRESENT flag defined in this patch.
> Hence the below code is a dead code and the patch
> Title is not justified as it says adding support for VFIO.
I believe VFIO_PRESENT flag is dependent on the platform who supports
VFIO and determined in rte_vfio.h.
The driver will not work without VFIO support and returns silently
(functions in #else part).
Do you mean I need to change the title?
>
> > +static int
> > +vfio_map_dev_obj(const char *path, const char *dev_obj,
> > +              uint32_t *size, void **addr, int *dev_fd)
>
> Regards,
> Akhil

Thanks,
Vikas