net-next:v4: Add support to configure SR-IOV VF minimum and maximum Tx rate through ip tool.

o min_tx_rate puts lower limit on the VF bandwidth. VF is guaranteed
  to have a bandwidth of at least this value.
  max_tx_rate puts cap on the VF bandwidth. VF can have a bandwidth
  of up to this value.

o A new handler set_vf_rate for attr IFLA_VF_RATE has been introduced
  which takes 4 arguments:
  netdev, VF number, min_tx_rate, max_tx_rate

o ndo_set_vf_rate replaces ndo_set_vf_tx_rate handler.

o Drivers that currently implement ndo_set_vf_tx_rate should now call
  ndo_set_vf_rate instead and reject attempt to set a minimum bandwidth
  greater than 0 for IFLA_VF_TX_RATE when IFLA_VF_RATE is not yet
  implemented by driver.

o If user enters only one of either min_tx_rate or max_tx_rate, then,
  userland should read back the other value from driver and set both
  for IFLA_VF_RATE.
  Drivers that have not yet implemented IFLA_VF_RATE should always
  return min_tx_rate as 0 when read from ip tool.

o If both IFLA_VF_TX_RATE and IFLA_VF_RATE options are specified, then
  IFLA_VF_RATE should override.

o Idea is to have consistent display of rate values to user.

o Usage example: -

  ./ip link set p4p1 vf 0 rate 900

  ./ip link show p4p1
  32: p4p1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode
  DEFAULT qlen 1000
    link/ether 00:0e:1e:08:b0:f0 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 3e:a0:ca:bd:ae:5a, tx rate 900 (Mbps), max_tx_rate 900Mbps
    vf 1 MAC f6:c6:7c:3f:3d:6c
    vf 2 MAC 56:32:43:98:d7:71
    vf 3 MAC d6:be:c3:b5:85:ff
    vf 4 MAC ee:a9:9a:1e:19:14
    vf 5 MAC 4a:d0:4c:07:52:18
    vf 6 MAC 3a:76:44:93:62:f9
    vf 7 MAC 82:e9:e7:e3:15:1a

  ./ip link set p4p1 vf 0 max_tx_rate 300 min_tx_rate 200

  ./ip link show p4p1
  32: p4p1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode
  DEFAULT qlen 1000
    link/ether 00:0e:1e:08:b0:f0 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 3e:a0:ca:bd:ae:5a, tx rate 300 (Mbps), max_tx_rate 300Mbps,
    min_tx_rate 200Mbps
    vf 1 MAC f6:c6:7c:3f:3d:6c
    vf 2 MAC 56:32:43:98:d7:71
    vf 3 MAC d6:be:c3:b5:85:ff
    vf 4 MAC ee:a9:9a:1e:19:14
    vf 5 MAC 4a:d0:4c:07:52:18
    vf 6 MAC 3a:76:44:93:62:f9
    vf 7 MAC 82:e9:e7:e3:15:1a

  ./ip link set p4p1 vf 0 max_tx_rate 600 rate 300

  ./ip link show p4p1
  32: p4p1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode
  DEFAULT qlen 1000
    link/ether 00:0e:1e:08:b0:f brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 3e:a0:ca:bd:ae:5, tx rate 600 (Mbps), max_tx_rate 600Mbps,
    min_tx_rate 200Mbps
    vf 1 MAC f6:c6:7c:3f:3d:6c
    vf 2 MAC 56:32:43:98:d7:71
    vf 3 MAC d6:be:c3:b5:85:ff
    vf 4 MAC ee:a9:9a:1e:19:14
    vf 5 MAC 4a:d0:4c:07:52:18
    vf 6 MAC 3a:76:44:93:62:f9
    vf 7 MAC 82:e9:e7:e3:15:1a

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 15 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
index 6d2f72f114f2..a29538b86edf 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
@@ -1848,7 +1848,8 @@ int qlcnic_sriov_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 	return 0;
 }
 
-int qlcnic_sriov_set_vf_tx_rate(struct net_device *netdev, int vf, int tx_rate)
+int qlcnic_sriov_set_vf_tx_rate(struct net_device *netdev, int vf,
+				int min_tx_rate, int max_tx_rate)
 {
 	struct qlcnic_adapter *adapter = netdev_priv(netdev);
 	struct qlcnic_sriov *sriov = adapter->ahw->sriov;
@@ -1863,35 +1864,52 @@ int qlcnic_sriov_set_vf_tx_rate(struct net_device *netdev, int vf, int tx_rate)
 	if (vf >= sriov->num_vfs)
 		return -EINVAL;
 
-	if (tx_rate >= 10000 || tx_rate < 100) {
+	vf_info = &sriov->vf_info[vf];
+	vp = vf_info->vp;
+	vpid = vp->handle;
+
+	if (!min_tx_rate)
+		min_tx_rate = QLC_VF_MIN_TX_RATE;
+
+	if (max_tx_rate &&
+	    (max_tx_rate >= 10000 || max_tx_rate < min_tx_rate)) {
 		netdev_err(netdev,
-			   "Invalid Tx rate, allowed range is [%d - %d]",
-			   QLC_VF_MIN_TX_RATE, QLC_VF_MAX_TX_RATE);
+			   "Invalid max Tx rate, allowed range is [%d - %d]",
+			   min_tx_rate, QLC_VF_MAX_TX_RATE);
 		return -EINVAL;
 	}
 
-	if (tx_rate == 0)
-		tx_rate = 10000;
+	if (!max_tx_rate)
+		max_tx_rate = 10000;
 
-	vf_info = &sriov->vf_info[vf];
-	vp = vf_info->vp;
-	vpid = vp->handle;
+	if (min_tx_rate &&
+	    (min_tx_rate > max_tx_rate || min_tx_rate < QLC_VF_MIN_TX_RATE)) {
+		netdev_err(netdev,
+			   "Invalid min Tx rate, allowed range is [%d - %d]",
+			   QLC_VF_MIN_TX_RATE, max_tx_rate);
+		return -EINVAL;
+	}
 
 	if (test_bit(QLC_BC_VF_STATE, &vf_info->state)) {
 		if (qlcnic_sriov_get_vf_vport_info(adapter, &nic_info, vpid))
 			return -EIO;
 
-		nic_info.max_tx_bw = tx_rate / 100;
+		nic_info.max_tx_bw = max_tx_rate / 100;
+		nic_info.min_tx_bw = min_tx_rate / 100;
 		nic_info.bit_offsets = BIT_0;
 
 		if (qlcnic_sriov_pf_set_vport_info(adapter, &nic_info, vpid))
 			return -EIO;
 	}
 
-	vp->max_tx_bw = tx_rate / 100;
+	vp->max_tx_bw = max_tx_rate / 100;
+	netdev_info(netdev,
+		    "Setting Max Tx rate %d (Mbps), %d %% of PF bandwidth, for VF %d\n",
+		    max_tx_rate, vp->max_tx_bw, vf);
+	vp->min_tx_bw = min_tx_rate / 100;
 	netdev_info(netdev,
-		    "Setting Tx rate %d (Mbps), %d %% of PF bandwidth, for VF %d\n",
-		    tx_rate, vp->max_tx_bw, vf);
+		    "Setting Min Tx rate %d (Mbps), %d %% of PF bandwidth, for VF %d\n",
+		    min_tx_rate, vp->min_tx_bw, vf);
 	return 0;
 }
 
@@ -1990,9 +2008,13 @@ int qlcnic_sriov_get_vf_config(struct net_device *netdev,
 	ivi->qos = vp->qos;
 	ivi->spoofchk = vp->spoofchk;
 	if (vp->max_tx_bw == MAX_BW)
-		ivi->tx_rate = 0;
+		ivi->max_tx_rate = 0;
+	else
+		ivi->max_tx_rate = vp->max_tx_bw * 100;
+	if (vp->min_tx_bw == MIN_BW)
+		ivi->min_tx_rate = 0;
 	else
-		ivi->tx_rate = vp->max_tx_bw * 100;
+		ivi->min_tx_rate = vp->min_tx_bw * 100;
 
 	ivi->vf = vf;
 	return 0;