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i40e: stop VF rings

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Explicitly stop the rings belonging to each VF when disabling SR-IOV.
Even though the VFs were gone, and the associated VSIs were removed,
the rings were not stopped, and in some circumstances the hardware would
continue to access the memory formerly used by the rings, causing
memory corruption or DMAR errors, both of which would lead to general
malaise of the kernel.

To relieve this condition, explicitly stop all the rings associated with
each VF before releasing its resources.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2015-04-07 11:32:55 -07:00 committed by Jeff Kirsher
parent f4f88c6d3b
commit 4443463852
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
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@ -733,6 +733,11 @@ void i40e_free_vfs(struct i40e_pf *pf)
while (test_and_set_bit(__I40E_VF_DISABLE, &pf->state))
usleep_range(1000, 2000);
for (i = 0; i < pf->num_alloc_vfs; i++)
if (test_bit(I40E_VF_STAT_INIT, &pf->vf[i].vf_states))
i40e_vsi_control_rings(pf->vsi[pf->vf[i].lan_vsi_idx],
false);
/* Disable IOV before freeing resources. This lets any VF drivers
* running in the host get themselves cleaned up before we yank
* the carpet out from underneath their feet.