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ice: Fix Tx timeout when link is toggled on a VF's interface 

Currently if the iavf is loaded and a VF link transitions from up to
down to up again a Tx timeout will be triggered. This happens because
Tx/Rx queue interrupts are only enabled when receiving the
VIRTCHNL_OP_CONFIG_MAP_IRQ message, which happens on reset or initial
iavf driver load, but not when bringing link up. This is problematic
because they are disabled on the VIRTCHNL_OP_DISABLE_QUEUES message,
which is part of bringing a VF's link down. However, they are not
enabled on the VIRTCHNL_OP_ENABLE_QUEUES message, which is part of
bringing a VF's link up.

Fix this by re-enabling the VF's Rx and Tx queue interrupts when they
were previously configured. This is done by first checking to make
sure the previous value in QINT_[R|T]QCTL.MSIX_INDX is not 0, which
is used to represent the OICR in the VF's interrupt space. If the
MSIX_INDX is non-zero then enable the interrupt by setting the
QINT_[R|T]CTL.CAUSE_ENA bit to 1.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Brett Creeley 2020-05-15 17:36:32 -07:00 committed by Jeff Kirsher
parent 7438a3b094
commit 4dc926d3a5
1 changed files with 48 additions and 0 deletions
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48
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
View File

@ -2316,6 +2316,52 @@ static bool ice_vc_validate_vqs_bitmaps(struct virtchnl_queue_select *vqs)
return true;
}
/**
* ice_vf_ena_txq_interrupt - enable Tx queue interrupt via QINT_TQCTL
* @vsi: VSI of the VF to configure
* @q_idx: VF queue index used to determine the queue in the PF's space
*/
static void ice_vf_ena_txq_interrupt(struct ice_vsi *vsi, u32 q_idx)
{
struct ice_hw *hw = &vsi->back->hw;
u32 pfq = vsi->txq_map[q_idx];
u32 reg;
reg = rd32(hw, QINT_TQCTL(pfq));
/* MSI-X index 0 in the VF's space is always for the OICR, which means
* this is most likely a poll mode VF driver, so don't enable an
* interrupt that was never configured via VIRTCHNL_OP_CONFIG_IRQ_MAP
*/
if (!(reg & QINT_TQCTL_MSIX_INDX_M))
return;
wr32(hw, QINT_TQCTL(pfq), reg | QINT_TQCTL_CAUSE_ENA_M);
}
/**
* ice_vf_ena_rxq_interrupt - enable Tx queue interrupt via QINT_RQCTL
* @vsi: VSI of the VF to configure
* @q_idx: VF queue index used to determine the queue in the PF's space
*/
static void ice_vf_ena_rxq_interrupt(struct ice_vsi *vsi, u32 q_idx)
{
struct ice_hw *hw = &vsi->back->hw;
u32 pfq = vsi->rxq_map[q_idx];
u32 reg;
reg = rd32(hw, QINT_RQCTL(pfq));
/* MSI-X index 0 in the VF's space is always for the OICR, which means
* this is most likely a poll mode VF driver, so don't enable an
* interrupt that was never configured via VIRTCHNL_OP_CONFIG_IRQ_MAP
*/
if (!(reg & QINT_RQCTL_MSIX_INDX_M))
return;
wr32(hw, QINT_RQCTL(pfq), reg | QINT_RQCTL_CAUSE_ENA_M);
}
/**
* ice_vc_ena_qs_msg
* @vf: pointer to the VF info
@ -2376,6 +2422,7 @@ static int ice_vc_ena_qs_msg(struct ice_vf *vf, u8 *msg)
goto error_param;
}
ice_vf_ena_rxq_interrupt(vsi, vf_q_id);
set_bit(vf_q_id, vf->rxq_ena);
}
@ -2391,6 +2438,7 @@ static int ice_vc_ena_qs_msg(struct ice_vf *vf, u8 *msg)
if (test_bit(vf_q_id, vf->txq_ena))
continue;
ice_vf_ena_txq_interrupt(vsi, vf_q_id);
set_bit(vf_q_id, vf->txq_ena);
}