[PATCH net-next 0/3] ibmvnic: Implement driver-defined queue limits

[PATCH net-next 0/3] ibmvnic: Implement driver-defined queue limits

[Thomas Falcon]

In this patch series, update the ibmvnic driver to use driver-defined
queue limits instead of limits imposed by the Virtual I/O server
management partition. For some deviced, initial max queue size and
amount limits, despite their definition, can actually be exceeded if
the client driver requests it. With this in mind, define a private
ethtool flag that toggles the use of driver-defined limits. These
limits are currently more than what supported hardware will likely
allow, so the driver will attempt to get as close as possible to
the user request but may not fully succeed.

Thomas Falcon (3):
  ibmvnic: Increase maximum queue size limit
  ibmvnic: Introduce driver limits for ring sizes
  ibmvnic: Add ethtool private flag for driver-defined queue limits

 drivers/net/ethernet/ibm/ibmvnic.c | 129 +++++++++++++++++++++++++++----------
 drivers/net/ethernet/ibm/ibmvnic.h |   9 ++-
 2 files changed, 102 insertions(+), 36 deletions(-)

-- 
2.12.3

[PATCH net-next 1/3] ibmvnic: Increase maximum queue size limit

[Thomas Falcon]

Increase queue size limit to 16. Devices available for IBM vNIC today
will not allow this amount, but this should give us some leeway for
future devices that may support more RX or TX queues.

Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index f06eec145ca6..2c1787109f1c 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -39,7 +39,7 @@
 #define IBMVNIC_RX_WEIGHT		16
 /* when changing this, update IBMVNIC_IO_ENTITLEMENT_DEFAULT */
 #define IBMVNIC_BUFFS_PER_POOL	100
-#define IBMVNIC_MAX_QUEUES	10
+#define IBMVNIC_MAX_QUEUES	16
 
 #define IBMVNIC_TSO_BUF_SZ	65536
 #define IBMVNIC_TSO_BUFS	64
-- 
2.12.3

[PATCH net-next 2/3] ibmvnic: Introduce driver limits for ring sizes

[Thomas Falcon]

Introduce driver-defined maximums for queue ring sizes. Devices
available for IBM vNIC today will likely not allow this amount,
but this should give us some leeway for future devices that may
support larger ring sizes.

Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 2c1787109f1c..f9a12e5843c4 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -40,6 +40,7 @@
 /* when changing this, update IBMVNIC_IO_ENTITLEMENT_DEFAULT */
 #define IBMVNIC_BUFFS_PER_POOL	100
 #define IBMVNIC_MAX_QUEUES	16
+#define IBMVNIC_MAX_QUEUE_SZ   4096
 
 #define IBMVNIC_TSO_BUF_SZ	65536
 #define IBMVNIC_TSO_BUFS	64
-- 
2.12.3

[PATCH net-next 3/3] ibmvnic: Add ethtool private flag for driver-defined queue limits

[Thomas Falcon]

When choosing channel amounts and ring sizes, the maximums in the
ibmvnic driver are defined by the virtual i/o server management
partition. Even though they are defined as maximums, the client
driver may in fact successfully request resources that exceed
these limits, which are mostly dependent on a user's hardware

With this in mind, provide an ethtool flag that when enabled will
allow the user to request resources limited by driver-defined
maximums instead of limits defined by the management partition.
The driver will try to honor the user's request but may not allowed
by the management partition. In this case, the driver requests
as close as it can get to the desired amount until it succeeds.

Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 129 +++++++++++++++++++++++++++----------
 drivers/net/ethernet/ibm/ibmvnic.h |   6 ++
 2 files changed, 100 insertions(+), 35 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index a8369addfe68..ad898e8eaca1 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2364,8 +2364,13 @@ static void ibmvnic_get_ringparam(struct net_device *netdev,
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
-	ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
-	ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
+	if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
+		ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
+		ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
+	} else {
+		ring->rx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
+		ring->tx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
+	}
 	ring->rx_mini_max_pending = 0;
 	ring->rx_jumbo_max_pending = 0;
 	ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
@@ -2378,21 +2383,23 @@ static int ibmvnic_set_ringparam(struct net_device *netdev,
 				 struct ethtool_ringparam *ring)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
+	int ret;
 
-	if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq  ||
-	    ring->tx_pending > adapter->max_tx_entries_per_subcrq) {
-		netdev_err(netdev, "Invalid request.\n");
-		netdev_err(netdev, "Max tx buffers = %llu\n",
-			   adapter->max_rx_add_entries_per_subcrq);
-		netdev_err(netdev, "Max rx buffers = %llu\n",
-			   adapter->max_tx_entries_per_subcrq);
-		return -EINVAL;
-	}
-
+	ret = 0;
 	adapter->desired.rx_entries = ring->rx_pending;
 	adapter->desired.tx_entries = ring->tx_pending;
 
-	return wait_for_reset(adapter);
+	ret = wait_for_reset(adapter);
+
+	if (!ret &&
+	    (adapter->req_rx_add_entries_per_subcrq != ring->rx_pending ||
+	     adapter->req_tx_entries_per_subcrq != ring->tx_pending))
+		netdev_info(netdev,
+			    "Could not match full ringsize request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
+			    ring->rx_pending, ring->tx_pending,
+			    adapter->req_rx_add_entries_per_subcrq,
+			    adapter->req_tx_entries_per_subcrq);
+	return ret;
 }
 
 static void ibmvnic_get_channels(struct net_device *netdev,
@@ -2400,8 +2407,14 @@ static void ibmvnic_get_channels(struct net_device *netdev,
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
-	channels->max_rx = adapter->max_rx_queues;
-	channels->max_tx = adapter->max_tx_queues;
+	if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
+		channels->max_rx = adapter->max_rx_queues;
+		channels->max_tx = adapter->max_tx_queues;
+	} else {
+		channels->max_rx = IBMVNIC_MAX_QUEUES;
+		channels->max_tx = IBMVNIC_MAX_QUEUES;
+	}
+
 	channels->max_other = 0;
 	channels->max_combined = 0;
 	channels->rx_count = adapter->req_rx_queues;
@@ -2414,11 +2427,23 @@ static int ibmvnic_set_channels(struct net_device *netdev,
 				struct ethtool_channels *channels)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
+	int ret;
 
+	ret = 0;
 	adapter->desired.rx_queues = channels->rx_count;
 	adapter->desired.tx_queues = channels->tx_count;
 
-	return wait_for_reset(adapter);
+	ret = wait_for_reset(adapter);
+
+	if (!ret &&
+	    (adapter->req_rx_queues != channels->rx_count ||
+	     adapter->req_tx_queues != channels->tx_count))
+		netdev_info(netdev,
+			    "Could not match full channels request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
+			    channels->rx_count, channels->tx_count,
+			    adapter->req_rx_queues, adapter->req_tx_queues);
+	return ret;
+
 }
 
 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
@@ -2426,32 +2451,43 @@ static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 	struct ibmvnic_adapter *adapter = netdev_priv(dev);
 	int i;
 
-	if (stringset != ETH_SS_STATS)
-		return;
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < ARRAY_SIZE(ibmvnic_stats);
+				i++, data += ETH_GSTRING_LEN)
+			memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
 
-	for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN)
-		memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
+		for (i = 0; i < adapter->req_tx_queues; i++) {
+			snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
+			data += ETH_GSTRING_LEN;
 
-	for (i = 0; i < adapter->req_tx_queues; i++) {
-		snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
-		data += ETH_GSTRING_LEN;
+			snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
+			data += ETH_GSTRING_LEN;
 
-		snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
-		data += ETH_GSTRING_LEN;
+			snprintf(data, ETH_GSTRING_LEN,
+				 "tx%d_dropped_packets", i);
+			data += ETH_GSTRING_LEN;
+		}
 
-		snprintf(data, ETH_GSTRING_LEN, "tx%d_dropped_packets", i);
-		data += ETH_GSTRING_LEN;
-	}
+		for (i = 0; i < adapter->req_rx_queues; i++) {
+			snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
+			data += ETH_GSTRING_LEN;
 
-	for (i = 0; i < adapter->req_rx_queues; i++) {
-		snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
-		data += ETH_GSTRING_LEN;
+			snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
+			data += ETH_GSTRING_LEN;
 
-		snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
-		data += ETH_GSTRING_LEN;
+			snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
+			data += ETH_GSTRING_LEN;
+		}
+		break;
 
-		snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
-		data += ETH_GSTRING_LEN;
+	case ETH_SS_PRIV_FLAGS:
+		for (i = 0; i < ARRAY_SIZE(ibmvnic_priv_flags); i++)
+			strcpy(data + i * ETH_GSTRING_LEN,
+			       ibmvnic_priv_flags[i]);
+		break;
+	default:
+		return;
 	}
 }
 
@@ -2464,6 +2500,8 @@ static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
 		return ARRAY_SIZE(ibmvnic_stats) +
 		       adapter->req_tx_queues * NUM_TX_STATS +
 		       adapter->req_rx_queues * NUM_RX_STATS;
+	case ETH_SS_PRIV_FLAGS:
+		return ARRAY_SIZE(ibmvnic_priv_flags);
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -2514,6 +2552,25 @@ static void ibmvnic_get_ethtool_stats(struct net_device *dev,
 	}
 }
 
+static u32 ibmvnic_get_priv_flags(struct net_device *netdev)
+{
+	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
+
+	return adapter->priv_flags;
+}
+
+static int ibmvnic_set_priv_flags(struct net_device *netdev, u32 flags)
+{
+	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
+	bool which_maxes = !!(flags & IBMVNIC_USE_SERVER_MAXES);
+
+	if (which_maxes)
+		adapter->priv_flags |= IBMVNIC_USE_SERVER_MAXES;
+	else
+		adapter->priv_flags &= ~IBMVNIC_USE_SERVER_MAXES;
+
+	return 0;
+}
 static const struct ethtool_ops ibmvnic_ethtool_ops = {
 	.get_drvinfo		= ibmvnic_get_drvinfo,
 	.get_msglevel		= ibmvnic_get_msglevel,
@@ -2527,6 +2584,8 @@ static const struct ethtool_ops ibmvnic_ethtool_ops = {
 	.get_sset_count         = ibmvnic_get_sset_count,
 	.get_ethtool_stats	= ibmvnic_get_ethtool_stats,
 	.get_link_ksettings	= ibmvnic_get_link_ksettings,
+	.get_priv_flags		= ibmvnic_get_priv_flags,
+	.set_priv_flags		= ibmvnic_set_priv_flags,
 };
 
 /* Routines for managing CRQs/sCRQs  */
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index f9a12e5843c4..18103b811d4d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -49,6 +49,11 @@
 #define IBMVNIC_MAX_LTB_SIZE ((1 << (MAX_ORDER - 1)) * PAGE_SIZE)
 #define IBMVNIC_BUFFER_HLEN 500
 
+static const char ibmvnic_priv_flags[][ETH_GSTRING_LEN] = {
+#define IBMVNIC_USE_SERVER_MAXES 0x1
+	"use-server-maxes"
+};
+
 struct ibmvnic_login_buffer {
 	__be32 len;
 	__be32 version;
@@ -970,6 +975,7 @@ struct ibmvnic_adapter {
 	struct ibmvnic_control_ip_offload_buffer ip_offload_ctrl;
 	dma_addr_t ip_offload_ctrl_tok;
 	u32 msg_enable;
+	u32 priv_flags;
 
 	/* Vital Product Data (VPD) */
 	struct ibmvnic_vpd *vpd;
-- 
2.12.3

Re: [PATCH net-next 0/3] ibmvnic: Implement driver-defined queue limits

[David Miller]

From: Thomas Falcon <tlfalcon@linux.ibm.com>
Date: Fri, 28 Sep 2018 18:38:23 -0500

> In this patch series, update the ibmvnic driver to use driver-defined
> queue limits instead of limits imposed by the Virtual I/O server
> management partition. For some deviced, initial max queue size and
> amount limits, despite their definition, can actually be exceeded if
> the client driver requests it. With this in mind, define a private
> ethtool flag that toggles the use of driver-defined limits. These
> limits are currently more than what supported hardware will likely
> allow, so the driver will attempt to get as close as possible to
> the user request but may not fully succeed.

Series applied.