[PATCH net 5/5] bnx2x: fix VLAN configuration for VFs.

[Yuval Mintz <yuvalmin@broadcom.com>]

If the hypervisor configures a vlan for the VF via the PF, the expected
result is that only packets tagged by said vlan will be received by the VF
(and that vlan will be silently removed).
Do to an incorrect manipulation of vlan filters in the driver, the
VF can receive untagged traffic even if the hypervisor configured
some vlan for it.

This patch corrects the behaviour.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c    |  10 +-
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h    |   7 +
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c | 245 ++++++++++++----------
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h |   1 +
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c  |  23 +-
 5 files changed, 174 insertions(+), 112 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
index 95feada..18438a5 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
@@ -2038,6 +2038,7 @@ static int bnx2x_vlan_mac_del_all(struct bnx2x *bp,
 	struct bnx2x_vlan_mac_ramrod_params p;
 	struct bnx2x_exe_queue_obj *exeq = &o->exe_queue;
 	struct bnx2x_exeq_elem *exeq_pos, *exeq_pos_n;
+	unsigned long flags;
 	int read_lock;
 	int rc = 0;
 
@@ -2046,8 +2047,9 @@ static int bnx2x_vlan_mac_del_all(struct bnx2x *bp,
 	spin_lock_bh(&exeq->lock);
 
 	list_for_each_entry_safe(exeq_pos, exeq_pos_n, &exeq->exe_queue, link) {
-		if (exeq_pos->cmd_data.vlan_mac.vlan_mac_flags ==
-		    *vlan_mac_flags) {
+		flags = exeq_pos->cmd_data.vlan_mac.vlan_mac_flags;
+		if (BNX2X_VLAN_MAC_CMP_FLAGS(flags) ==
+		    BNX2X_VLAN_MAC_CMP_FLAGS(*vlan_mac_flags)) {
 			rc = exeq->remove(bp, exeq->owner, exeq_pos);
 			if (rc) {
 				BNX2X_ERR("Failed to remove command\n");
@@ -2080,7 +2082,9 @@ static int bnx2x_vlan_mac_del_all(struct bnx2x *bp,
 		return read_lock;
 
 	list_for_each_entry(pos, &o->head, link) {
-		if (pos->vlan_mac_flags == *vlan_mac_flags) {
+		flags = pos->vlan_mac_flags;
+		if (BNX2X_VLAN_MAC_CMP_FLAGS(flags) ==
+		    BNX2X_VLAN_MAC_CMP_FLAGS(*vlan_mac_flags)) {
 			p.user_req.vlan_mac_flags = pos->vlan_mac_flags;
 			memcpy(&p.user_req.u, &pos->u, sizeof(pos->u));
 			rc = bnx2x_config_vlan_mac(bp, &p);
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h
index 658f4e3..6a53c15 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.h
@@ -266,6 +266,13 @@ enum {
 	BNX2X_DONT_CONSUME_CAM_CREDIT,
 	BNX2X_DONT_CONSUME_CAM_CREDIT_DEST,
 };
+/* When looking for matching filters, some flags are not interesting */
+#define BNX2X_VLAN_MAC_CMP_MASK	(1 << BNX2X_UC_LIST_MAC | \
+				 1 << BNX2X_ETH_MAC | \
+				 1 << BNX2X_ISCSI_ETH_MAC | \
+				 1 << BNX2X_NETQ_ETH_MAC)
+#define BNX2X_VLAN_MAC_CMP_FLAGS(flags) \
+	((flags) & BNX2X_VLAN_MAC_CMP_MASK)
 
 struct bnx2x_vlan_mac_ramrod_params {
 	/* Object to run the command from */
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
index ddd95b9..e7845e5 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
@@ -1209,6 +1209,11 @@ static void bnx2x_vfop_rxmode(struct bnx2x *bp, struct bnx2x_virtf *vf)
 		/* next state */
 		vfop->state = BNX2X_VFOP_RXMODE_DONE;
 
+		/* record the accept flags in vfdb so hypervisor can modify them
+		 * if necessary
+		 */
+		bnx2x_vfq(vf, ramrod->cl_id - vf->igu_base_id, accept_flags) =
+			ramrod->rx_accept_flags;
 		vfop->rc = bnx2x_config_rx_mode(bp, ramrod);
 		bnx2x_vfop_finalize(vf, vfop->rc, VFOP_DONE);
 op_err:
@@ -1224,39 +1229,43 @@ op_pending:
 	return;
 }
 
+static void bnx2x_vf_prep_rx_mode(struct bnx2x *bp, u8 qid,
+				  struct bnx2x_rx_mode_ramrod_params *ramrod,
+				  struct bnx2x_virtf *vf,
+				  unsigned long accept_flags)
+{
+	struct bnx2x_vf_queue *vfq = vfq_get(vf, qid);
+
+	memset(ramrod, 0, sizeof(*ramrod));
+	ramrod->cid = vfq->cid;
+	ramrod->cl_id = vfq_cl_id(vf, vfq);
+	ramrod->rx_mode_obj = &bp->rx_mode_obj;
+	ramrod->func_id = FW_VF_HANDLE(vf->abs_vfid);
+	ramrod->rx_accept_flags = accept_flags;
+	ramrod->tx_accept_flags = accept_flags;
+	ramrod->pstate = &vf->filter_state;
+	ramrod->state = BNX2X_FILTER_RX_MODE_PENDING;
+
+	set_bit(BNX2X_FILTER_RX_MODE_PENDING, &vf->filter_state);
+	set_bit(RAMROD_RX, &ramrod->ramrod_flags);
+	set_bit(RAMROD_TX, &ramrod->ramrod_flags);
+
+	ramrod->rdata = bnx2x_vf_sp(bp, vf, rx_mode_rdata.e2);
+	ramrod->rdata_mapping = bnx2x_vf_sp_map(bp, vf, rx_mode_rdata.e2);
+}
+
 int bnx2x_vfop_rxmode_cmd(struct bnx2x *bp,
 			  struct bnx2x_virtf *vf,
 			  struct bnx2x_vfop_cmd *cmd,
 			  int qid, unsigned long accept_flags)
 {
-	struct bnx2x_vf_queue *vfq = vfq_get(vf, qid);
 	struct bnx2x_vfop *vfop = bnx2x_vfop_add(bp, vf);
 
 	if (vfop) {
 		struct bnx2x_rx_mode_ramrod_params *ramrod =
 			&vf->op_params.rx_mode;
 
-		memset(ramrod, 0, sizeof(*ramrod));
-
-		/* Prepare ramrod parameters */
-		ramrod->cid = vfq->cid;
-		ramrod->cl_id = vfq_cl_id(vf, vfq);
-		ramrod->rx_mode_obj = &bp->rx_mode_obj;
-		ramrod->func_id = FW_VF_HANDLE(vf->abs_vfid);
-
-		ramrod->rx_accept_flags = accept_flags;
-		ramrod->tx_accept_flags = accept_flags;
-		ramrod->pstate = &vf->filter_state;
-		ramrod->state = BNX2X_FILTER_RX_MODE_PENDING;
-
-		set_bit(BNX2X_FILTER_RX_MODE_PENDING, &vf->filter_state);
-		set_bit(RAMROD_RX, &ramrod->ramrod_flags);
-		set_bit(RAMROD_TX, &ramrod->ramrod_flags);
-
-		ramrod->rdata =
-			bnx2x_vf_sp(bp, vf, rx_mode_rdata.e2);
-		ramrod->rdata_mapping =
-			bnx2x_vf_sp_map(bp, vf, rx_mode_rdata.e2);
+		bnx2x_vf_prep_rx_mode(bp, qid, ramrod, vf, accept_flags);
 
 		bnx2x_vfop_opset(BNX2X_VFOP_RXMODE_CONFIG,
 				 bnx2x_vfop_rxmode, cmd->done);
@@ -3439,10 +3448,18 @@ out:
 
 int bnx2x_set_vf_vlan(struct net_device *dev, int vfidx, u16 vlan, u8 qos)
 {
+	struct bnx2x_queue_state_params q_params = {NULL};
+	struct bnx2x_vlan_mac_ramrod_params ramrod_param;
+	struct bnx2x_queue_update_params *update_params;
+	struct pf_vf_bulletin_content *bulletin = NULL;
+	struct bnx2x_rx_mode_ramrod_params rx_ramrod;
 	struct bnx2x *bp = netdev_priv(dev);
-	int rc, q_logical_state;
+	struct bnx2x_vlan_mac_obj *vlan_obj;
+	unsigned long vlan_mac_flags = 0;
+	unsigned long ramrod_flags = 0;
 	struct bnx2x_virtf *vf = NULL;
-	struct pf_vf_bulletin_content *bulletin = NULL;
+	unsigned long accept_flags;
+	int rc;
 
 	/* sanity and init */
 	rc = bnx2x_vf_ndo_prep(bp, vfidx, &vf, &bulletin);
@@ -3460,104 +3477,118 @@ int bnx2x_set_vf_vlan(struct net_device *dev, int vfidx, u16 vlan, u8 qos)
 	/* update PF's copy of the VF's bulletin. No point in posting the vlan
 	 * to the VF since it doesn't have anything to do with it. But it useful
 	 * to store it here in case the VF is not up yet and we can only
-	 * configure the vlan later when it does.
+	 * configure the vlan later when it does. Treat vlan id 0 as remove the
+	 * Host tag.
 	 */
-	bulletin->valid_bitmap |= 1 << VLAN_VALID;
+	if (vlan > 0)
+		bulletin->valid_bitmap |= 1 << VLAN_VALID;
+	else
+		bulletin->valid_bitmap &= ~(1 << VLAN_VALID);
 	bulletin->vlan = vlan;
 
 	/* is vf initialized and queue set up? */
-	q_logical_state =
-		bnx2x_get_q_logical_state(bp, &bnx2x_leading_vfq(vf, sp_obj));
-	if (vf->state == VF_ENABLED &&
-	    q_logical_state == BNX2X_Q_LOGICAL_STATE_ACTIVE) {
-		/* configure the vlan in device on this vf's queue */
-		unsigned long ramrod_flags = 0;
-		unsigned long vlan_mac_flags = 0;
-		struct bnx2x_vlan_mac_obj *vlan_obj =
-			&bnx2x_leading_vfq(vf, vlan_obj);
-		struct bnx2x_vlan_mac_ramrod_params ramrod_param;
-		struct bnx2x_queue_state_params q_params = {NULL};
-		struct bnx2x_queue_update_params *update_params;
+	if (vf->state != VF_ENABLED ||
+	    bnx2x_get_q_logical_state(bp, &bnx2x_leading_vfq(vf, sp_obj)) !=
+	    BNX2X_Q_LOGICAL_STATE_ACTIVE)
+		return rc;
 
-		rc = validate_vlan_mac(bp, &bnx2x_leading_vfq(vf, mac_obj));
-		if (rc)
-			return rc;
-		memset(&ramrod_param, 0, sizeof(ramrod_param));
+	/* configure the vlan in device on this vf's queue */
+	vlan_obj = &bnx2x_leading_vfq(vf, vlan_obj);
+	rc = validate_vlan_mac(bp, &bnx2x_leading_vfq(vf, mac_obj));
+	if (rc)
+		return rc;
 
-		/* must lock vfpf channel to protect against vf flows */
-		bnx2x_lock_vf_pf_channel(bp, vf, CHANNEL_TLV_PF_SET_VLAN);
+	/* must lock vfpf channel to protect against vf flows */
+	bnx2x_lock_vf_pf_channel(bp, vf, CHANNEL_TLV_PF_SET_VLAN);
 
-		/* remove existing vlans */
-		__set_bit(RAMROD_COMP_WAIT, &ramrod_flags);
-		rc = vlan_obj->delete_all(bp, vlan_obj, &vlan_mac_flags,
-					  &ramrod_flags);
-		if (rc) {
-			BNX2X_ERR("failed to delete vlans\n");
-			rc = -EINVAL;
-			goto out;
-		}
+	/* remove existing vlans */
+	__set_bit(RAMROD_COMP_WAIT, &ramrod_flags);
+	rc = vlan_obj->delete_all(bp, vlan_obj, &vlan_mac_flags,
+				  &ramrod_flags);
+	if (rc) {
+		BNX2X_ERR("failed to delete vlans\n");
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* need to remove/add the VF's accept_any_vlan bit */
+	accept_flags = bnx2x_leading_vfq(vf, accept_flags);
+	if (vlan)
+		clear_bit(BNX2X_ACCEPT_ANY_VLAN, &accept_flags);
+	else
+		set_bit(BNX2X_ACCEPT_ANY_VLAN, &accept_flags);
+
+	bnx2x_vf_prep_rx_mode(bp, LEADING_IDX, &rx_ramrod, vf,
+			      accept_flags);
+	bnx2x_leading_vfq(vf, accept_flags) = accept_flags;
+	bnx2x_config_rx_mode(bp, &rx_ramrod);
+
+	/* configure the new vlan to device */
+	memset(&ramrod_param, 0, sizeof(ramrod_param));
+	__set_bit(RAMROD_COMP_WAIT, &ramrod_flags);
+	ramrod_param.vlan_mac_obj = vlan_obj;
+	ramrod_param.ramrod_flags = ramrod_flags;
+	set_bit(BNX2X_DONT_CONSUME_CAM_CREDIT,
+		&ramrod_param.user_req.vlan_mac_flags);
+	ramrod_param.user_req.u.vlan.vlan = vlan;
+	ramrod_param.user_req.cmd = BNX2X_VLAN_MAC_ADD;
+	rc = bnx2x_config_vlan_mac(bp, &ramrod_param);
+	if (rc) {
+		BNX2X_ERR("failed to configure vlan\n");
+		rc =  -EINVAL;
+		goto out;
+	}
 
-		/* send queue update ramrod to configure default vlan and silent
-		 * vlan removal
+	/* send queue update ramrod to configure default vlan and silent
+	 * vlan removal
+	 */
+	__set_bit(RAMROD_COMP_WAIT, &q_params.ramrod_flags);
+	q_params.cmd = BNX2X_Q_CMD_UPDATE;
+	q_params.q_obj = &bnx2x_leading_vfq(vf, sp_obj);
+	update_params = &q_params.params.update;
+	__set_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN_CHNG,
+		  &update_params->update_flags);
+	__set_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM_CHNG,
+		  &update_params->update_flags);
+	if (vlan == 0) {
+		/* if vlan is 0 then we want to leave the VF traffic
+		 * untagged, and leave the incoming traffic untouched
+		 * (i.e. do not remove any vlan tags).
 		 */
-		__set_bit(RAMROD_COMP_WAIT, &q_params.ramrod_flags);
-		q_params.cmd = BNX2X_Q_CMD_UPDATE;
-		q_params.q_obj = &bnx2x_leading_vfq(vf, sp_obj);
-		update_params = &q_params.params.update;
-		__set_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN_CHNG,
+		__clear_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN,
+			    &update_params->update_flags);
+		__clear_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM,
+			    &update_params->update_flags);
+	} else {
+		/* configure default vlan to vf queue and set silent
+		 * vlan removal (the vf remains unaware of this vlan).
+		 */
+		__set_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN,
 			  &update_params->update_flags);
-		__set_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM_CHNG,
+		__set_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM,
 			  &update_params->update_flags);
+		update_params->def_vlan = vlan;
+		update_params->silent_removal_value =
+			vlan & VLAN_VID_MASK;
+		update_params->silent_removal_mask = VLAN_VID_MASK;
+	}
 
-		if (vlan == 0) {
-			/* if vlan is 0 then we want to leave the VF traffic
-			 * untagged, and leave the incoming traffic untouched
-			 * (i.e. do not remove any vlan tags).
-			 */
-			__clear_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN,
-				    &update_params->update_flags);
-			__clear_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM,
-				    &update_params->update_flags);
-		} else {
-			/* configure the new vlan to device */
-			__set_bit(RAMROD_COMP_WAIT, &ramrod_flags);
-			ramrod_param.vlan_mac_obj = vlan_obj;
-			ramrod_param.ramrod_flags = ramrod_flags;
-			ramrod_param.user_req.u.vlan.vlan = vlan;
-			ramrod_param.user_req.cmd = BNX2X_VLAN_MAC_ADD;
-			rc = bnx2x_config_vlan_mac(bp, &ramrod_param);
-			if (rc) {
-				BNX2X_ERR("failed to configure vlan\n");
-				rc =  -EINVAL;
-				goto out;
-			}
-
-			/* configure default vlan to vf queue and set silent
-			 * vlan removal (the vf remains unaware of this vlan).
-			 */
-			update_params = &q_params.params.update;
-			__set_bit(BNX2X_Q_UPDATE_DEF_VLAN_EN,
-				  &update_params->update_flags);
-			__set_bit(BNX2X_Q_UPDATE_SILENT_VLAN_REM,
-				  &update_params->update_flags);
-			update_params->def_vlan = vlan;
-		}
+	/* Update the Queue state */
+	rc = bnx2x_queue_state_change(bp, &q_params);
+	if (rc) {
+		BNX2X_ERR("Failed to configure default VLAN\n");
+		goto out;
+	}
 
-		/* Update the Queue state */
-		rc = bnx2x_queue_state_change(bp, &q_params);
-		if (rc) {
-			BNX2X_ERR("Failed to configure default VLAN\n");
-			goto out;
-		}
 
-		/* clear the flag indicating that this VF needs its vlan
-		 * (will only be set if the HV configured the Vlan before vf was
-		 * up and we were called because the VF came up later
-		 */
+	/* clear the flag indicating that this VF needs its vlan
+	 * (will only be set if the HV configured the Vlan before vf was
+	 * up and we were called because the VF came up later
+	 */
 out:
-		vf->cfg_flags &= ~VF_CFG_VLAN;
-		bnx2x_unlock_vf_pf_channel(bp, vf, CHANNEL_TLV_PF_SET_VLAN);
-	}
+	vf->cfg_flags &= ~VF_CFG_VLAN;
+	bnx2x_unlock_vf_pf_channel(bp, vf, CHANNEL_TLV_PF_SET_VLAN);
+
 	return rc;
 }
 
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h
index 1ff6a93..8c213fa52 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h
@@ -74,6 +74,7 @@ struct bnx2x_vf_queue {
 	/* VLANs object */
 	struct bnx2x_vlan_mac_obj	vlan_obj;
 	atomic_t vlan_count;		/* 0 means vlan-0 is set  ~ untagged */
+	unsigned long accept_flags;	/* last accept flags configured */
 
 	/* Queue Slow-path State object */
 	struct bnx2x_queue_sp_obj	sp_obj;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
index 26fcba2..0756d7d 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
@@ -1598,6 +1598,8 @@ static void bnx2x_vfop_mbx_qfilters(struct bnx2x *bp, struct bnx2x_virtf *vf)
 
 		if (msg->flags & VFPF_SET_Q_FILTERS_RX_MASK_CHANGED) {
 			unsigned long accept = 0;
+			struct pf_vf_bulletin_content *bulletin =
+				BP_VF_BULLETIN(bp, vf->index);
 
 			/* covert VF-PF if mask to bnx2x accept flags */
 			if (msg->rx_mask & VFPF_RX_MASK_ACCEPT_MATCHED_UNICAST)
@@ -1617,9 +1619,11 @@ static void bnx2x_vfop_mbx_qfilters(struct bnx2x *bp, struct bnx2x_virtf *vf)
 				__set_bit(BNX2X_ACCEPT_BROADCAST, &accept);
 
 			/* A packet arriving the vf's mac should be accepted
-			 * with any vlan
+			 * with any vlan, unless a vlan has already been
+			 * configured.
 			 */
-			__set_bit(BNX2X_ACCEPT_ANY_VLAN, &accept);
+			if (!(bulletin->valid_bitmap & (1 << VLAN_VALID)))
+				__set_bit(BNX2X_ACCEPT_ANY_VLAN, &accept);
 
 			/* set rx-mode */
 			rc = bnx2x_vfop_rxmode_cmd(bp, vf, &cmd,
@@ -1710,6 +1714,21 @@ static void bnx2x_vf_mbx_set_q_filters(struct bnx2x *bp,
 			goto response;
 		}
 	}
+	/* if vlan was set by hypervisor we don't allow guest to config vlan */
+	if (bulletin->valid_bitmap & 1 << VLAN_VALID) {
+		int i;
+
+		/* search for vlan filters */
+		for (i = 0; i < filters->n_mac_vlan_filters; i++) {
+			if (filters->filters[i].flags &
+			    VFPF_Q_FILTER_VLAN_TAG_VALID) {
+				BNX2X_ERR("VF[%d] attempted to configure vlan but one was already set by Hypervisor. Aborting request\n",
+					  vf->abs_vfid);
+				vf->op_rc = -EPERM;
+				goto response;
+			}
+		}
+	}
 
 	/* verify vf_qid */
 	if (filters->vf_qid > vf_rxq_count(vf))
-- 
1.8.1.227.g44fe835