5.4-stable review patch. If anyone has any objections, please let me know.
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From: Aleksandr Loktionov aleksandr.loktionov@intel.com
[ Upstream commit 37d318d7805f25b672bfd74fc694f19a2ee9665d ]
In some occasions task held spinlock (mac_filter_hash_lock), while being rescheduled due to admin queue mutex_lock. The struct i40e_spinlock asq_spinlock, which later expands to struct mutex spinlock. Moved i40e_aq_set_vsi_multicast_promiscuous(), i40e_aq_set_vsi_unicast_promiscuous(), i40e_aq_set_vsi_mc_promisc_on_vlan(), and i40e_aq_set_vsi_uc_promisc_on_vlan() outside of atomic context. Without this patch there is a race condition, which might result in scheduling while in atomic context. The race condition is between the thread, which holds mac_filter_hash_lock, while trying to acquire an admin queue mutex and a thread, which already has said admin queue mutex. The thread, which holds spinlock, fails to acquire the mutex, which causes this thread to sleep.
Signed-off-by: Arkadiusz Kubalewski arkadiusz.kubalewski@intel.com Signed-off-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Tested-by: Andrew Bowers andrewx.bowers@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Stable-dep-of: d0d362ffa33d ("i40e: Fix VF VLAN offloading when port VLAN is configured") Signed-off-by: Sasha Levin sashal@kernel.org --- .../ethernet/intel/i40e/i40e_virtchnl_pf.c | 234 ++++++++++-------- 1 file changed, 137 insertions(+), 97 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c index be07148a7b294..590469c4a1b00 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c @@ -1110,39 +1110,81 @@ static int i40e_quiesce_vf_pci(struct i40e_vf *vf) return -EIO; }
-static inline int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi); +/** + * i40e_getnum_vf_vsi_vlan_filters + * @vsi: pointer to the vsi + * + * called to get the number of VLANs offloaded on this VF + **/ +static int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi) +{ + struct i40e_mac_filter *f; + int num_vlans = 0, bkt; + + hash_for_each(vsi->mac_filter_hash, bkt, f, hlist) { + if (f->vlan >= 0 && f->vlan <= I40E_MAX_VLANID) + num_vlans++; + } + + return num_vlans; +}
/** - * i40e_config_vf_promiscuous_mode - * @vf: pointer to the VF info - * @vsi_id: VSI id - * @allmulti: set MAC L2 layer multicast promiscuous enable/disable - * @alluni: set MAC L2 layer unicast promiscuous enable/disable + * i40e_get_vlan_list_sync + * @vsi: pointer to the VSI + * @num_vlans: number of VLANs in mac_filter_hash, returned to caller + * @vlan_list: list of VLANs present in mac_filter_hash, returned to caller. + * This array is allocated here, but has to be freed in caller. * - * Called from the VF to configure the promiscuous mode of - * VF vsis and from the VF reset path to reset promiscuous mode. + * Called to get number of VLANs and VLAN list present in mac_filter_hash. **/ -static i40e_status i40e_config_vf_promiscuous_mode(struct i40e_vf *vf, - u16 vsi_id, - bool allmulti, - bool alluni) +static void i40e_get_vlan_list_sync(struct i40e_vsi *vsi, int *num_vlans, + s16 **vlan_list) { - struct i40e_pf *pf = vf->pf; - struct i40e_hw *hw = &pf->hw; struct i40e_mac_filter *f; - i40e_status aq_ret = 0; - struct i40e_vsi *vsi; + int i = 0; int bkt;
- vsi = i40e_find_vsi_from_id(pf, vsi_id); - if (!i40e_vc_isvalid_vsi_id(vf, vsi_id) || !vsi) - return I40E_ERR_PARAM; + spin_lock_bh(&vsi->mac_filter_hash_lock); + *num_vlans = i40e_getnum_vf_vsi_vlan_filters(vsi); + *vlan_list = kcalloc(*num_vlans, sizeof(**vlan_list), GFP_ATOMIC); + if (!(*vlan_list)) + goto err;
- if (vf->port_vlan_id) { - aq_ret = i40e_aq_set_vsi_mc_promisc_on_vlan(hw, vsi->seid, - allmulti, - vf->port_vlan_id, - NULL); + hash_for_each(vsi->mac_filter_hash, bkt, f, hlist) { + if (f->vlan < 0 || f->vlan > I40E_MAX_VLANID) + continue; + (*vlan_list)[i++] = f->vlan; + } +err: + spin_unlock_bh(&vsi->mac_filter_hash_lock); +} + +/** + * i40e_set_vsi_promisc + * @vf: pointer to the VF struct + * @seid: VSI number + * @multi_enable: set MAC L2 layer multicast promiscuous enable/disable + * for a given VLAN + * @unicast_enable: set MAC L2 layer unicast promiscuous enable/disable + * for a given VLAN + * @vl: List of VLANs - apply filter for given VLANs + * @num_vlans: Number of elements in @vl + **/ +static i40e_status +i40e_set_vsi_promisc(struct i40e_vf *vf, u16 seid, bool multi_enable, + bool unicast_enable, s16 *vl, int num_vlans) +{ + struct i40e_pf *pf = vf->pf; + struct i40e_hw *hw = &pf->hw; + i40e_status aq_ret; + int i; + + /* No VLAN to set promisc on, set on VSI */ + if (!num_vlans || !vl) { + aq_ret = i40e_aq_set_vsi_multicast_promiscuous(hw, seid, + multi_enable, + NULL); if (aq_ret) { int aq_err = pf->hw.aq.asq_last_status;
@@ -1151,13 +1193,14 @@ static i40e_status i40e_config_vf_promiscuous_mode(struct i40e_vf *vf, vf->vf_id, i40e_stat_str(&pf->hw, aq_ret), i40e_aq_str(&pf->hw, aq_err)); + return aq_ret; }
- aq_ret = i40e_aq_set_vsi_uc_promisc_on_vlan(hw, vsi->seid, - alluni, - vf->port_vlan_id, - NULL); + aq_ret = i40e_aq_set_vsi_unicast_promiscuous(hw, seid, + unicast_enable, + NULL, true); + if (aq_ret) { int aq_err = pf->hw.aq.asq_last_status;
@@ -1167,68 +1210,84 @@ static i40e_status i40e_config_vf_promiscuous_mode(struct i40e_vf *vf, i40e_stat_str(&pf->hw, aq_ret), i40e_aq_str(&pf->hw, aq_err)); } + return aq_ret; - } else if (i40e_getnum_vf_vsi_vlan_filters(vsi)) { - hash_for_each(vsi->mac_filter_hash, bkt, f, hlist) { - if (f->vlan < 0 || f->vlan > I40E_MAX_VLANID) - continue; - aq_ret = i40e_aq_set_vsi_mc_promisc_on_vlan(hw, - vsi->seid, - allmulti, - f->vlan, - NULL); - if (aq_ret) { - int aq_err = pf->hw.aq.asq_last_status; + }
- dev_err(&pf->pdev->dev, - "Could not add VLAN %d to multicast promiscuous domain err %s aq_err %s\n", - f->vlan, - i40e_stat_str(&pf->hw, aq_ret), - i40e_aq_str(&pf->hw, aq_err)); - } + for (i = 0; i < num_vlans; i++) { + aq_ret = i40e_aq_set_vsi_mc_promisc_on_vlan(hw, seid, + multi_enable, + vl[i], NULL); + if (aq_ret) { + int aq_err = pf->hw.aq.asq_last_status; + + dev_err(&pf->pdev->dev, + "VF %d failed to set multicast promiscuous mode err %s aq_err %s\n", + vf->vf_id, + i40e_stat_str(&pf->hw, aq_ret), + i40e_aq_str(&pf->hw, aq_err)); + }
- aq_ret = i40e_aq_set_vsi_uc_promisc_on_vlan(hw, - vsi->seid, - alluni, - f->vlan, - NULL); - if (aq_ret) { - int aq_err = pf->hw.aq.asq_last_status; + aq_ret = i40e_aq_set_vsi_uc_promisc_on_vlan(hw, seid, + unicast_enable, + vl[i], NULL); + if (aq_ret) { + int aq_err = pf->hw.aq.asq_last_status;
- dev_err(&pf->pdev->dev, - "Could not add VLAN %d to Unicast promiscuous domain err %s aq_err %s\n", - f->vlan, - i40e_stat_str(&pf->hw, aq_ret), - i40e_aq_str(&pf->hw, aq_err)); - } + dev_err(&pf->pdev->dev, + "VF %d failed to set unicast promiscuous mode err %s aq_err %s\n", + vf->vf_id, + i40e_stat_str(&pf->hw, aq_ret), + i40e_aq_str(&pf->hw, aq_err)); } - return aq_ret; } - aq_ret = i40e_aq_set_vsi_multicast_promiscuous(hw, vsi->seid, allmulti, - NULL); - if (aq_ret) { - int aq_err = pf->hw.aq.asq_last_status; + return aq_ret; +}
- dev_err(&pf->pdev->dev, - "VF %d failed to set multicast promiscuous mode err %s aq_err %s\n", - vf->vf_id, - i40e_stat_str(&pf->hw, aq_ret), - i40e_aq_str(&pf->hw, aq_err)); +/** + * i40e_config_vf_promiscuous_mode + * @vf: pointer to the VF info + * @vsi_id: VSI id + * @allmulti: set MAC L2 layer multicast promiscuous enable/disable + * @alluni: set MAC L2 layer unicast promiscuous enable/disable + * + * Called from the VF to configure the promiscuous mode of + * VF vsis and from the VF reset path to reset promiscuous mode. + **/ +static i40e_status i40e_config_vf_promiscuous_mode(struct i40e_vf *vf, + u16 vsi_id, + bool allmulti, + bool alluni) +{ + i40e_status aq_ret = I40E_SUCCESS; + struct i40e_pf *pf = vf->pf; + struct i40e_vsi *vsi; + int num_vlans; + s16 *vl; + + vsi = i40e_find_vsi_from_id(pf, vsi_id); + if (!i40e_vc_isvalid_vsi_id(vf, vsi_id) || !vsi) + return I40E_ERR_PARAM; + + if (vf->port_vlan_id) { + aq_ret = i40e_set_vsi_promisc(vf, vsi->seid, allmulti, + alluni, &vf->port_vlan_id, 1); return aq_ret; - } + } else if (i40e_getnum_vf_vsi_vlan_filters(vsi)) { + i40e_get_vlan_list_sync(vsi, &num_vlans, &vl);
- aq_ret = i40e_aq_set_vsi_unicast_promiscuous(hw, vsi->seid, alluni, - NULL, true); - if (aq_ret) { - int aq_err = pf->hw.aq.asq_last_status; + if (!vl) + return I40E_ERR_NO_MEMORY;
- dev_err(&pf->pdev->dev, - "VF %d failed to set unicast promiscuous mode err %s aq_err %s\n", - vf->vf_id, - i40e_stat_str(&pf->hw, aq_ret), - i40e_aq_str(&pf->hw, aq_err)); + aq_ret = i40e_set_vsi_promisc(vf, vsi->seid, allmulti, alluni, + vl, num_vlans); + kfree(vl); + return aq_ret; }
+ /* no VLANs to set on, set on VSI */ + aq_ret = i40e_set_vsi_promisc(vf, vsi->seid, allmulti, alluni, + NULL, 0); return aq_ret; }
@@ -2052,25 +2111,6 @@ static void i40e_vc_reset_vf_msg(struct i40e_vf *vf) i40e_reset_vf(vf, false); }
-/** - * i40e_getnum_vf_vsi_vlan_filters - * @vsi: pointer to the vsi - * - * called to get the number of VLANs offloaded on this VF - **/ -static inline int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi) -{ - struct i40e_mac_filter *f; - int num_vlans = 0, bkt; - - hash_for_each(vsi->mac_filter_hash, bkt, f, hlist) { - if (f->vlan >= 0 && f->vlan <= I40E_MAX_VLANID) - num_vlans++; - } - - return num_vlans; -} - /** * i40e_vc_config_promiscuous_mode_msg * @vf: pointer to the VF info