From: Alice Michael Date: Wed, 7 Mar 2018 05:49:51 -0800 Subject: [Intel-wired-lan] [next PATCH S87-V3 2/8] i40e: Fix attach VF to VM issue In-Reply-To: <20180307134957.61497-1-alice.michael@intel.com> References: <20180307134957.61497-1-alice.michael@intel.com> Message-ID: <20180307134957.61497-2-alice.michael@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: From: Pawe? Jab?o?ski Fix for "Resource temporarily unavailable" problem when virsh is trying to attach a device to VM. When the VF driver is loaded on host and virsh is trying to attach it to the VM and set a MAC address, it ends with a race condition between i40e_reset_vf and i40e_ndo_set_vf_mac functions. The bug is fixed by adding polling in i40e_ndo_set_vf_mac function For when the VF is in Reset mode. Signed-off-by: Pawe? Jab?o?ski --- drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c index 6049a56..8559c09 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c @@ -3742,6 +3742,7 @@ int i40e_ndo_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac) int ret = 0; struct hlist_node *h; int bkt; + u8 i; /* validate the request */ if (vf_id >= pf->num_alloc_vfs) { @@ -3753,6 +3754,16 @@ int i40e_ndo_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac) vf = &(pf->vf[vf_id]); vsi = pf->vsi[vf->lan_vsi_idx]; + + /* When the VF is resetting wait until it is done. + * It can take up to 200 milliseconds, + * but wait for up to 300 milliseconds to be safe. + */ + for (i = 0; i < 15; i++) { + if (test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) + break; + msleep(20); + } if (!test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) { dev_err(&pf->pdev->dev, "VF %d still in reset. Try again.\n", vf_id); -- 2.9.5