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Date: Thu, 25 Jun 2020 23:28:50 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
Andrew Bowers <andrewx.bowers@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next v3 8/8] i40e: Remove scheduling while atomic possibility
From: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
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@...el.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
.../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 56b9e445732b..8e133d6545bd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1106,39 +1106,81 @@ 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;
@@ -1147,13 +1189,14 @@ 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;
@@ -1163,68 +1206,84 @@ 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;
}
@@ -1972,25 +2031,6 @@ 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
--
2.26.2
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