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Date: Mon, 24 Oct 2022 03:05:25 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Jakub Kicinski <kuba@...nel.org>,
David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org,
Sylwester Dziedziuch <sylwesterx.dziedziuch@...el.com>,
Mateusz Palczewski <mateusz.palczewski@...el.com>,
Konrad Jankowski <konrad0.jankowski@...el.com>,
Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH v2 2/3] i40e: Fix VF hang when reset is triggered on another VF
From: Sylwester Dziedziuch <sylwesterx.dziedziuch@...el.com>
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: 3ba9bcb4b68f ("i40e: add locking around VF reset")
Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch@...el.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
Changes since v1
* Rebased to fix conflicts, sent as series properly
* Added my missing signed-off-by
.../ethernet/intel/i40e/i40e_virtchnl_pf.c | 43 ++++++++++++++-----
.../ethernet/intel/i40e/i40e_virtchnl_pf.h | 1 +
2 files changed, 33 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 7e9f6a69eb10..72ddcefc45b1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -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);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
index a554d0a0b09b..358bbdb58795 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
@@ -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 */
--
2.38.0.83.gd420dda05763
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