From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Always attempt to find already opened fd for an iommu group as subsequent attempts to open it will fail. There's no public API to check if a group was already bound and has a container, so rte_vfio_container_group_bind() shouldn't fail in such case. Fixes: ea2dc1066870 ("vfio: add multi container support") Cc: xiao.w.wang@intel.com Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> --- lib/librte_eal/linuxapp/eal/eal_vfio.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c index c68dc38e0..bcb869be1 100644 --- a/lib/librte_eal/linuxapp/eal/eal_vfio.c +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c @@ -1680,6 +1680,11 @@ rte_vfio_container_group_bind(int container_fd, int iommu_group_num) return -1; } + /* check if we already have the group descriptor open */ + for (i = 0; i < VFIO_MAX_GROUPS; i++) + if (vfio_cfg->vfio_groups[i].group_num == iommu_group_num) + return vfio_cfg->vfio_groups[i].fd; + /* Check room for new group */ if (vfio_cfg->vfio_active_groups == VFIO_MAX_GROUPS) { RTE_LOG(ERR, EAL, "Maximum number of VFIO groups reached!\n"); -- 2.17.1
From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Factor out duplicated code. Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> --- lib/librte_eal/linuxapp/eal/eal_vfio.c | 119 ++++++++++--------------- 1 file changed, 45 insertions(+), 74 deletions(-) diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c index bcb869be1..3e93a7934 100644 --- a/lib/librte_eal/linuxapp/eal/eal_vfio.c +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c @@ -345,46 +345,13 @@ get_vfio_cfg_by_group_num(int iommu_group_num) return NULL; } -static struct vfio_config * -get_vfio_cfg_by_group_fd(int vfio_group_fd) -{ - struct vfio_config *vfio_cfg; - int i, j; - - for (i = 0; i < VFIO_MAX_CONTAINERS; i++) { - vfio_cfg = &vfio_cfgs[i]; - for (j = 0; j < VFIO_MAX_GROUPS; j++) - if (vfio_cfg->vfio_groups[j].fd == vfio_group_fd) - return vfio_cfg; - } - - return NULL; -} - -static struct vfio_config * -get_vfio_cfg_by_container_fd(int container_fd) -{ - int i; - - for (i = 0; i < VFIO_MAX_CONTAINERS; i++) { - if (vfio_cfgs[i].vfio_container_fd == container_fd) - return &vfio_cfgs[i]; - } - - return NULL; -} - -int -rte_vfio_get_group_fd(int iommu_group_num) +static int +vfio_get_group_fd(struct vfio_config *vfio_cfg, + int iommu_group_num) { int i; int vfio_group_fd; struct vfio_group *cur_grp; - struct vfio_config *vfio_cfg; - - /* get the vfio_config it belongs to */ - vfio_cfg = get_vfio_cfg_by_group_num(iommu_group_num); - vfio_cfg = vfio_cfg ? vfio_cfg : default_vfio_cfg; /* check if we already have the group descriptor open */ for (i = 0; i < VFIO_MAX_GROUPS; i++) @@ -423,6 +390,47 @@ rte_vfio_get_group_fd(int iommu_group_num) return vfio_group_fd; } +static struct vfio_config * +get_vfio_cfg_by_group_fd(int vfio_group_fd) +{ + struct vfio_config *vfio_cfg; + int i, j; + + for (i = 0; i < VFIO_MAX_CONTAINERS; i++) { + vfio_cfg = &vfio_cfgs[i]; + for (j = 0; j < VFIO_MAX_GROUPS; j++) + if (vfio_cfg->vfio_groups[j].fd == vfio_group_fd) + return vfio_cfg; + } + + return NULL; +} + +static struct vfio_config * +get_vfio_cfg_by_container_fd(int container_fd) +{ + int i; + + for (i = 0; i < VFIO_MAX_CONTAINERS; i++) { + if (vfio_cfgs[i].vfio_container_fd == container_fd) + return &vfio_cfgs[i]; + } + + return NULL; +} + +int +rte_vfio_get_group_fd(int iommu_group_num) +{ + struct vfio_config *vfio_cfg; + + /* get the vfio_config it belongs to */ + vfio_cfg = get_vfio_cfg_by_group_num(iommu_group_num); + vfio_cfg = vfio_cfg ? vfio_cfg : default_vfio_cfg; + + return vfio_get_group_fd(vfio_cfg, iommu_group_num); +} + static int get_vfio_group_idx(int vfio_group_fd) { @@ -1670,9 +1678,6 @@ int rte_vfio_container_group_bind(int container_fd, int iommu_group_num) { struct vfio_config *vfio_cfg; - struct vfio_group *cur_grp; - int vfio_group_fd; - int i; vfio_cfg = get_vfio_cfg_by_container_fd(container_fd); if (vfio_cfg == NULL) { @@ -1680,41 +1685,7 @@ rte_vfio_container_group_bind(int container_fd, int iommu_group_num) return -1; } - /* check if we already have the group descriptor open */ - for (i = 0; i < VFIO_MAX_GROUPS; i++) - if (vfio_cfg->vfio_groups[i].group_num == iommu_group_num) - return vfio_cfg->vfio_groups[i].fd; - - /* Check room for new group */ - if (vfio_cfg->vfio_active_groups == VFIO_MAX_GROUPS) { - RTE_LOG(ERR, EAL, "Maximum number of VFIO groups reached!\n"); - return -1; - } - - /* Get an index for the new group */ - for (i = 0; i < VFIO_MAX_GROUPS; i++) - if (vfio_cfg->vfio_groups[i].group_num == -1) { - cur_grp = &vfio_cfg->vfio_groups[i]; - break; - } - - /* This should not happen */ - if (i == VFIO_MAX_GROUPS) { - RTE_LOG(ERR, EAL, "No VFIO group free slot found\n"); - return -1; - } - - vfio_group_fd = vfio_open_group_fd(iommu_group_num); - if (vfio_group_fd < 0) { - RTE_LOG(ERR, EAL, "Failed to open group %d\n", iommu_group_num); - return -1; - } - cur_grp->group_num = iommu_group_num; - cur_grp->fd = vfio_group_fd; - cur_grp->devices = 0; - vfio_cfg->vfio_active_groups++; - - return vfio_group_fd; + return vfio_get_group_fd(vfio_cfg, iommu_group_num); } int -- 2.17.1
Hi,
> -----Original Message-----
> From: Stojaczyk, Dariusz
> Sent: Monday, September 17, 2018 9:47 PM
> To: dev@dpdk.org
> Cc: Alejandro Lucero <alejandro.lucero@netronome.com>; Burakov, Anatoly
> <anatoly.burakov@intel.com>; stable@dpdk.org; Stojaczyk, Dariusz
> <dariusz.stojaczyk@intel.com>; Wang, Xiao W <xiao.w.wang@intel.com>
> Subject: [PATCH 1/2] eal/vfio: check if we already have the group fd open
>
> From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
>
> Always attempt to find already opened fd for an iommu
> group as subsequent attempts to open it will fail.
>
> There's no public API to check if a group was already
> bound and has a container, so rte_vfio_container_group_bind()
> shouldn't fail in such case.
>
> Fixes: ea2dc1066870 ("vfio: add multi container support")
> Cc: xiao.w.wang@intel.com
>
> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
> ---
> lib/librte_eal/linuxapp/eal/eal_vfio.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c
> b/lib/librte_eal/linuxapp/eal/eal_vfio.c
> index c68dc38e0..bcb869be1 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
> @@ -1680,6 +1680,11 @@ rte_vfio_container_group_bind(int container_fd,
> int iommu_group_num)
> return -1;
> }
>
> + /* check if we already have the group descriptor open */
> + for (i = 0; i < VFIO_MAX_GROUPS; i++)
> + if (vfio_cfg->vfio_groups[i].group_num == iommu_group_num)
> + return vfio_cfg->vfio_groups[i].fd;
> +
> /* Check room for new group */
> if (vfio_cfg->vfio_active_groups == VFIO_MAX_GROUPS) {
> RTE_LOG(ERR, EAL, "Maximum number of VFIO groups
> reached!\n");
> --
> 2.17.1
Acked-by: Xiao Wang <xiao.w.wang@intel.com>
BRs,
Xiao
On 17-Sep-18 2:46 PM, Darek Stojaczyk wrote: > From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> > > Factor out duplicated code. > > Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> > --- <snip> > + > +int > +rte_vfio_get_group_fd(int iommu_group_num) > +{ > + struct vfio_config *vfio_cfg; > + > + /* get the vfio_config it belongs to */ > + vfio_cfg = get_vfio_cfg_by_group_num(iommu_group_num); > + vfio_cfg = vfio_cfg ? vfio_cfg : default_vfio_cfg; I tend to prefer being explicit rather than implicit (i.e. 'vfio_cfg == NULL' instead of 'vfio_cfg'). Otherwise, Acked-by: Anatoly Burakov <anatoly.burakov@intel.com> -- Thanks, Anatoly
On 17-Sep-18 2:46 PM, Darek Stojaczyk wrote:
> From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
>
> Always attempt to find already opened fd for an iommu
> group as subsequent attempts to open it will fail.
>
> There's no public API to check if a group was already
> bound and has a container, so rte_vfio_container_group_bind()
> shouldn't fail in such case.
>
> Fixes: ea2dc1066870 ("vfio: add multi container support")
> Cc: xiao.w.wang@intel.com
>
> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
> ---
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
--
Thanks,
Anatoly
25/09/2018 09:56, Wang, Xiao W:
> Hi,
>
> > From: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
> >
> > Always attempt to find already opened fd for an iommu
> > group as subsequent attempts to open it will fail.
> >
> > There's no public API to check if a group was already
> > bound and has a container, so rte_vfio_container_group_bind()
> > shouldn't fail in such case.
> >
> > Fixes: ea2dc1066870 ("vfio: add multi container support")
> > Cc: xiao.w.wang@intel.com
> >
> > Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
>
> Acked-by: Xiao Wang <xiao.w.wang@intel.com>
+Cc: stable@dpdk.org
Series applied, thanks