This is a note to let you know that I've just added the patch titled
sfc: error code if SRIOV cannot be disabled
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sfc-error-code-if-sriov-cannot-be-disabled.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cfe78af77ee2bc939703a29dc6db0fe73eafff18
Author: �ñigo Huguet <ihuguet@xxxxxxxxxx>
Date: Mon Jun 21 17:32:36 2021 +0200
sfc: error code if SRIOV cannot be disabled
[ Upstream commit 1ebe4feb8b442884f5a28d2437040096723dd1ea ]
If SRIOV cannot be disabled during device removal or module unloading,
return error code so it can be logged properly in the calling function.
Note that this can only happen if any VF is currently attached to a
guest using Xen, but not with vfio/KVM. Despite that in that case the
VFs won't work properly with PF removed and/or the module unloaded, I
have let it as is because I don't know what side effects may have
changing it, and also it seems to be the same that other drivers are
doing in this situation.
In the case of being called during SRIOV reconfiguration, the behavior
hasn't changed because the function is called with force=false.
Signed-off-by: �ñigo Huguet <ihuguet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c b/drivers/net/ethernet/sfc/ef10_sriov.c
index 695e3508b4d8..e7c6aa29d323 100644
--- a/drivers/net/ethernet/sfc/ef10_sriov.c
+++ b/drivers/net/ethernet/sfc/ef10_sriov.c
@@ -403,12 +403,17 @@ fail1:
return rc;
}
+/* Disable SRIOV and remove VFs
+ * If some VFs are attached to a guest (using Xen, only) nothing is
+ * done if force=false, and vports are freed if force=true (for the non
+ * attachedc ones, only) but SRIOV is not disabled and VFs are not
+ * removed in either case.
+ */
static int efx_ef10_pci_sriov_disable(struct efx_nic *efx, bool force)
{
struct pci_dev *dev = efx->pci_dev;
- unsigned int vfs_assigned = 0;
-
- vfs_assigned = pci_vfs_assigned(dev);
+ unsigned int vfs_assigned = pci_vfs_assigned(dev);
+ int rc = 0;
if (vfs_assigned && !force) {
netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
@@ -418,10 +423,12 @@ static int efx_ef10_pci_sriov_disable(struct efx_nic *efx, bool force)
if (!vfs_assigned)
pci_disable_sriov(dev);
+ else
+ rc = -EBUSY;
efx_ef10_sriov_free_vf_vswitching(efx);
efx->vf_count = 0;
- return 0;
+ return rc;
}
int efx_ef10_sriov_configure(struct efx_nic *efx, int num_vfs)
