Commit 52424f97 authored by Sylwester Dziedziuch's avatar Sylwester Dziedziuch Committed by Jakub Kicinski

i40e: Fix VF hang when reset is triggered on another VF

When a reset was triggered on one VF with i40e_reset_vf
global PF state __I40E_VF_DISABLE was set on a PF until
the reset finished. If immediately after triggering reset
on one VF there is a request to reset on another
it will cause a hang on VF side because VF will be notified
of incoming reset but the reset will never happen because
of this global state, we will get such error message:

[  +4.890195] iavf 0000:86:02.1: Never saw reset

and VF will hang waiting for the reset to be triggered.

Fix this by introducing new VF state I40E_VF_STATE_RESETTING
that will be set on a VF if it is currently resetting instead of
the global __I40E_VF_DISABLE PF state.

Fixes: 3ba9bcb4 ("i40e: add locking around VF reset")
Signed-off-by: default avatarSylwester Dziedziuch <sylwesterx.dziedziuch@intel.com>
Signed-off-by: default avatarMateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: default avatarKonrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20221024100526.1874914-2-jacob.e.keller@intel.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 54b5af5a
......@@ -1536,10 +1536,12 @@ bool i40e_reset_vf(struct i40e_vf *vf, bool flr)
if (test_bit(__I40E_VF_RESETS_DISABLED, pf->state))
return true;
/* If the VFs have been disabled, this means something else is
* resetting the VF, so we shouldn't continue.
*/
if (test_and_set_bit(__I40E_VF_DISABLE, pf->state))
/* Bail out if VFs are disabled. */
if (test_bit(__I40E_VF_DISABLE, pf->state))
return true;
/* If VF is being reset already we don't need to continue. */
if (test_and_set_bit(I40E_VF_STATE_RESETTING, &vf->vf_states))
return true;
i40e_trigger_vf_reset(vf, flr);
......@@ -1576,7 +1578,7 @@ bool i40e_reset_vf(struct i40e_vf *vf, bool flr)
i40e_cleanup_reset_vf(vf);
i40e_flush(hw);
clear_bit(__I40E_VF_DISABLE, pf->state);
clear_bit(I40E_VF_STATE_RESETTING, &vf->vf_states);
return true;
}
......@@ -1609,8 +1611,12 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr)
return false;
/* Begin reset on all VFs at once */
for (v = 0; v < pf->num_alloc_vfs; v++)
i40e_trigger_vf_reset(&pf->vf[v], flr);
for (v = 0; v < pf->num_alloc_vfs; v++) {
vf = &pf->vf[v];
/* If VF is being reset no need to trigger reset again */
if (!test_bit(I40E_VF_STATE_RESETTING, &vf->vf_states))
i40e_trigger_vf_reset(&pf->vf[v], flr);
}
/* HW requires some time to make sure it can flush the FIFO for a VF
* when it resets it. Poll the VPGEN_VFRSTAT register for each VF in
......@@ -1626,9 +1632,11 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr)
*/
while (v < pf->num_alloc_vfs) {
vf = &pf->vf[v];
reg = rd32(hw, I40E_VPGEN_VFRSTAT(vf->vf_id));
if (!(reg & I40E_VPGEN_VFRSTAT_VFRD_MASK))
break;
if (!test_bit(I40E_VF_STATE_RESETTING, &vf->vf_states)) {
reg = rd32(hw, I40E_VPGEN_VFRSTAT(vf->vf_id));
if (!(reg & I40E_VPGEN_VFRSTAT_VFRD_MASK))
break;
}
/* If the current VF has finished resetting, move on
* to the next VF in sequence.
......@@ -1656,6 +1664,10 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr)
if (pf->vf[v].lan_vsi_idx == 0)
continue;
/* If VF is reset in another thread just continue */
if (test_bit(I40E_VF_STATE_RESETTING, &vf->vf_states))
continue;
i40e_vsi_stop_rings_no_wait(pf->vsi[pf->vf[v].lan_vsi_idx]);
}
......@@ -1667,6 +1679,10 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr)
if (pf->vf[v].lan_vsi_idx == 0)
continue;
/* If VF is reset in another thread just continue */
if (test_bit(I40E_VF_STATE_RESETTING, &vf->vf_states))
continue;
i40e_vsi_wait_queues_disabled(pf->vsi[pf->vf[v].lan_vsi_idx]);
}
......@@ -1676,8 +1692,13 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr)
mdelay(50);
/* Finish the reset on each VF */
for (v = 0; v < pf->num_alloc_vfs; v++)
for (v = 0; v < pf->num_alloc_vfs; v++) {
/* If VF is reset in another thread just continue */
if (test_bit(I40E_VF_STATE_RESETTING, &vf->vf_states))
continue;
i40e_cleanup_reset_vf(&pf->vf[v]);
}
i40e_flush(hw);
clear_bit(__I40E_VF_DISABLE, pf->state);
......
......@@ -39,6 +39,7 @@ enum i40e_vf_states {
I40E_VF_STATE_MC_PROMISC,
I40E_VF_STATE_UC_PROMISC,
I40E_VF_STATE_PRE_ENABLE,
I40E_VF_STATE_RESETTING
};
/* VF capabilities */
......
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