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linux-sg2042
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bnxt_en: More robust SRIOV cleanup sequence. 

Instead of always calling pci_sriov_disable() in remove_one(),
the driver should detect whether VFs are currently assigned
to the VMs. If the VFs are active in VMs, then it should not
disable SRIOV as it is catastrophic to the VMs. Instead,
it just leaves the VFs alone and continues to unload the PF.
The user can then cleanup the VMs even after the PF driver
has been unloaded.

Signed-off-by: Jeffrey Huang <huangjw@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeffrey Huang 2015-11-05 16:25:51 -05:00 committed by David S. Miller
parent 84e86b98f6
commit 4bb6cdce38
1 changed files with 27 additions and 13 deletions
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38
drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
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@ -258,7 +258,7 @@ static int bnxt_set_vf_attr(struct bnxt *bp, int num_vfs)
return 0;
}
static int bnxt_hwrm_func_vf_resource_free(struct bnxt *bp)
static int bnxt_hwrm_func_vf_resource_free(struct bnxt *bp, int num_vfs)
{
int i, rc = 0;
struct bnxt_pf_info *pf = &bp->pf;
@ -267,7 +267,7 @@ static int bnxt_hwrm_func_vf_resource_free(struct bnxt *bp)
bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_VF_RESC_FREE, -1, -1);
mutex_lock(&bp->hwrm_cmd_lock);
for (i = pf->first_vf_id; i < pf->first_vf_id + pf->active_vfs; i++) {
for (i = pf->first_vf_id; i < pf->first_vf_id + num_vfs; i++) {
req.vf_id = cpu_to_le16(i);
rc = _hwrm_send_message(bp, &req, sizeof(req),
HWRM_CMD_TIMEOUT);
@ -509,7 +509,7 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
err_out2:
/* Free the resources reserved for various VF's */
bnxt_hwrm_func_vf_resource_free(bp);
bnxt_hwrm_func_vf_resource_free(bp, *num_vfs);
err_out1:
bnxt_free_vf_resources(bp);
@ -519,13 +519,19 @@ err_out1:
void bnxt_sriov_disable(struct bnxt *bp)
{
if (!bp->pf.active_vfs)
u16 num_vfs = pci_num_vf(bp->pdev);
if (!num_vfs)
return;
if (pci_vfs_assigned(bp->pdev)) {
netdev_warn(bp->dev, "Unable to free %d VFs because some are assigned to VMs.\n",
num_vfs);
} else {
pci_disable_sriov(bp->pdev);
/* Free the resources reserved for various VF's */
bnxt_hwrm_func_vf_resource_free(bp);
/* Free the HW resources reserved for various VF's */
bnxt_hwrm_func_vf_resource_free(bp, num_vfs);
}
bnxt_free_vf_resources(bp);
@ -552,17 +558,25 @@ int bnxt_sriov_configure(struct pci_dev *pdev, int num_vfs)
}
bp->sriov_cfg = true;
rtnl_unlock();
if (!num_vfs) {
bnxt_sriov_disable(bp);
return 0;
if (pci_vfs_assigned(bp->pdev)) {
netdev_warn(dev, "Unable to configure SRIOV since some VFs are assigned to VMs.\n");
num_vfs = 0;
goto sriov_cfg_exit;
}
/* Check if enabled VFs is same as requested */
if (num_vfs == bp->pf.active_vfs)
return 0;
if (num_vfs && num_vfs == bp->pf.active_vfs)
goto sriov_cfg_exit;
/* if there are previous existing VFs, clean them up */
bnxt_sriov_disable(bp);
if (!num_vfs)
goto sriov_cfg_exit;
bnxt_sriov_enable(bp, &num_vfs);
sriov_cfg_exit:
bp->sriov_cfg = false;
wake_up(&bp->sriov_cfg_wait);