ibmveth: Enable TCP checksum offload

diff -puN drivers/net/ibmveth.c~ibmveth_csum_offload drivers/net/ibmveth.c
@@ -47,6 +47,8 @@
 #include <linux/mm.h>
 #include <linux/ethtool.h>
 #include <linux/proc_fs.h>
+#include <linux/in.h>
+#include <linux/ip.h>
 #include <asm/semaphore.h>
 #include <asm/hvcall.h>
 #include <asm/atomic.h>

@@ -103,12 +105,15 @@ static struct proc_dir_entry *ibmveth_pr
 
 static const char ibmveth_driver_name[] = "ibmveth";
 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
+static unsigned int ibmveth_csum_offload = 1;
 #define ibmveth_driver_version "1.03"
 
 MODULE_AUTHOR("Santiago Leon <[email protected]>");
 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(ibmveth_driver_version);
+module_param_named(csum_offload, ibmveth_csum_offload, uint, 0);
+MODULE_PARM_DESC(csum_offload, "Checksum offload (0/1). Default: 1");
 
 /* simple methods of getting data from the current rxq entry */
 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)

@@ -131,6 +136,11 @@ static inline int ibmveth_rxq_frame_leng
 	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 }
 
+static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
+{
+	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].csum_good);
+}
+
 /* setup the initial settings for a buffer pool */
 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
 {

@@ -684,6 +694,24 @@ static int ibmveth_start_xmit(struct sk_
 					desc[0].fields.length, DMA_TO_DEVICE);
 	desc[0].fields.valid   = 1;
 
+	if (skb->ip_summed == CHECKSUM_PARTIAL &&
+	    ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
+		ibmveth_error_printk("tx: failed to checksum packet\n");
+		tx_dropped++;
+		goto out;
+	}
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		unsigned char *buf = skb_transport_header(skb) + skb->csum_offset;
+
+		desc[0].fields.no_csum = 1;
+		desc[0].fields.csum_good = 1;
+
+		/* Need to zero out the checksum */
+		buf[0] = 0;
+		buf[1] = 0;
+	}
+
 	if(dma_mapping_error(desc[0].fields.address)) {
 		ibmveth_error_printk("tx: unable to map initial fragment\n");
 		tx_map_failed++;

@@ -702,6 +730,10 @@ static int ibmveth_start_xmit(struct sk_
 				frag->size, DMA_TO_DEVICE);
 		desc[curfrag+1].fields.length = frag->size;
 		desc[curfrag+1].fields.valid  = 1;
+		if (skb->ip_summed == CHECKSUM_PARTIAL) {
+			desc[curfrag+1].fields.no_csum = 1;
+			desc[curfrag+1].fields.csum_good = 1;
+		}
 
 		if(dma_mapping_error(desc[curfrag+1].fields.address)) {
 			ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag);

@@ -792,7 +824,11 @@ static int ibmveth_poll(struct net_devic
 			} else {
 				int length = ibmveth_rxq_frame_length(adapter);
 				int offset = ibmveth_rxq_frame_offset(adapter);
+				int csum_good = ibmveth_rxq_csum_good(adapter);
+
 				skb = ibmveth_rxq_get_buffer(adapter);
+				if (csum_good)
+					skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 				ibmveth_rxq_harvest_buffer(adapter);
 

@@ -962,8 +998,10 @@ static void ibmveth_poll_controller(stru
 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 {
 	int rc, i;
+	long ret;
 	struct net_device *netdev;
 	struct ibmveth_adapter *adapter = NULL;
+	union ibmveth_illan_attributes set_attr, ret_attr;
 
 	unsigned char *mac_addr_p;
 	unsigned int *mcastFilterSize_p;

@@ -1058,6 +1096,26 @@ static int __devinit ibmveth_probe(struc
 
 	ibmveth_debug_printk("registering netdev...\n");
 
+	if (ibmveth_csum_offload) {
+		ret = h_illan_attributes(dev->unit_address, 0, 0, &ret_attr.desc);
+
+		if (ret == H_SUCCESS && !ret_attr.fields.active_trunk &&
+		    !ret_attr.fields.trunk_priority &&
+		    ret_attr.fields.csum_offload_padded_pkt_support) {
+			set_attr.desc = 0;
+			set_attr.fields.tcp_csum_offload_ipv4 = 1;
+
+			ret = h_illan_attributes(dev->unit_address, 0, set_attr.desc,
+						 &ret_attr.desc);
+
+			if (ret == H_SUCCESS)
+				netdev->features |= NETIF_F_IP_CSUM;
+			else
+				ret = h_illan_attributes(dev->unit_address, set_attr.desc,
+							 0, &ret_attr.desc);
+		}
+	}
+
 	rc = register_netdev(netdev);
 
 	if(rc) {

62 lines not on this page · raw message

diff -puN drivers/net/ibmveth.c~ibmveth_csum_offload_ethtool drivers/net/ibmveth.c
@@ -644,12 +644,127 @@ static u32 netdev_get_link(struct net_de
 	return 1;
 }
 
+static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+
+	if (data)
+		adapter->rx_csum = 1;
+	else {
+		adapter->rx_csum = 0;
+		dev->features &= ~NETIF_F_IP_CSUM;
+	}
+}
+
+static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+
+	if (data) {
+		dev->features |= NETIF_F_IP_CSUM;
+		adapter->rx_csum = 1;
+	} else
+		dev->features &= ~NETIF_F_IP_CSUM;
+}
+
+static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
+				    void (*done) (struct net_device *, u32))
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+	union ibmveth_illan_attributes set_attr, clr_attr, ret_attr;
+	long ret;
+	int rc1 = 0, rc2 = 0;
+	int restart = 0;
+
+	if (netif_running(dev)) {
+		restart = 1;
+		adapter->pool_config = 1;
+		ibmveth_close(dev);
+		adapter->pool_config = 0;
+	}
+
+	set_attr.desc = 0;
+	clr_attr.desc = 0;
+
+	if (data)
+		set_attr.fields.tcp_csum_offload_ipv4 = 1;
+	else
+		clr_attr.fields.tcp_csum_offload_ipv4 = 1;
+
+	ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr.desc);
+
+	if (ret == H_SUCCESS && !ret_attr.fields.active_trunk &&
+	    !ret_attr.fields.trunk_priority &&
+	    ret_attr.fields.csum_offload_padded_pkt_support) {
+		ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr.desc,
+					 set_attr.desc, &ret_attr.desc);
+
+		if (ret != H_SUCCESS) {
+			rc1 = -EIO;
+			ibmveth_error_printk("unable to change checksum offload settings."
+					     " %d rc=%ld\n", data, ret);
+
+			ret = h_illan_attributes(adapter->vdev->unit_address,
+						 set_attr.desc, clr_attr.desc, &ret_attr.desc);
+		} else
+			done(dev, data);
+	} else {
+		rc1 = -EIO;
+		ibmveth_error_printk("unable to change checksum offload settings."
+				     " %d rc=%ld ret_attr=%lx\n", data, ret, ret_attr.desc);
+	}
+
+	if (restart)
+		rc2 = ibmveth_open(dev);
+
+	return rc1 ? rc1 : rc2;
+}
+
+static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+
+	if (data && adapter->rx_csum)
+		return 0;
+	if (!data && !adapter->rx_csum)
+		return 0;
+
+	return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
+}
+
+static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+	int rc = 0;
+
+	if (data && (dev->features & NETIF_F_IP_CSUM))
+		return 0;
+	if (!data && !(dev->features & NETIF_F_IP_CSUM))
+		return 0;
+
+	if (data && !adapter->rx_csum)
+		rc = ibmveth_set_csum_offload(dev, data, ibmveth_set_tx_csum_flags);
+	else
+		ibmveth_set_tx_csum_flags(dev, data);
+
+	return rc;
+}
+
+static u32 ibmveth_get_rx_csum(struct net_device *dev)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+	return adapter->rx_csum;
+}
+
 static const struct ethtool_ops netdev_ethtool_ops = {
 	.get_drvinfo		= netdev_get_drvinfo,
 	.get_settings		= netdev_get_settings,
 	.get_link		= netdev_get_link,
 	.get_sg			= ethtool_op_get_sg,
 	.get_tx_csum		= ethtool_op_get_tx_csum,
+	.set_tx_csum		= ibmveth_set_tx_csum,
+	.get_rx_csum		= ibmveth_get_rx_csum,
+	.set_rx_csum		= ibmveth_set_rx_csum
 };
 
 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)

@@ -1108,9 +1223,10 @@ static int __devinit ibmveth_probe(struc
 			ret = h_illan_attributes(dev->unit_address, 0, set_attr.desc,
 						 &ret_attr.desc);
 
-			if (ret == H_SUCCESS)
+			if (ret == H_SUCCESS) {
+				adapter->rx_csum = 1;
 				netdev->features |= NETIF_F_IP_CSUM;
-			else
+			} else
 				ret = h_illan_attributes(dev->unit_address, set_attr.desc,
 							 0, &ret_attr.desc);
 		}

diff -puN drivers/net/ibmveth.h~ibmveth_csum_offload_ethtool drivers/net/ibmveth.h
@@ -140,6 +140,7 @@ struct ibmveth_adapter {
     struct ibmveth_buff_pool rx_buff_pool[IbmVethNumBufferPools];
     struct ibmveth_rx_q rx_queue;
     int pool_config;
+    int rx_csum;
 
     /* adapter specific stats */
     u64 replenish_task_cycles;

diff -puN drivers/net/ibmveth.c~ibmveth_ethtool_get_tso drivers/net/ibmveth.c
@@ -764,7 +764,9 @@ static const struct ethtool_ops netdev_e
 	.get_tx_csum		= ethtool_op_get_tx_csum,
 	.set_tx_csum		= ibmveth_set_tx_csum,
 	.get_rx_csum		= ibmveth_get_rx_csum,
-	.set_rx_csum		= ibmveth_set_rx_csum
+	.set_rx_csum		= ibmveth_set_rx_csum,
+	.get_tso			= ethtool_op_get_tso,
+	.get_ufo			= ethtool_op_get_ufo
 };
 
 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)

diff -puN drivers/net/ibmveth.c~ibmveth_ethtool_driver_stats drivers/net/ibmveth.c
@@ -115,6 +115,28 @@ MODULE_VERSION(ibmveth_driver_version);
 module_param_named(csum_offload, ibmveth_csum_offload, uint, 0);
 MODULE_PARM_DESC(csum_offload, "Checksum offload (0/1). Default: 1");
 
+struct ibmveth_stat {
+	char name[ETH_GSTRING_LEN];
+	int offset;
+};
+
+#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
+#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
+
+struct ibmveth_stat ibmveth_stats[] = {
+	{ "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
+	{ "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
+	{ "replenish_add_buff_failure", IBMVETH_STAT_OFF(replenish_add_buff_failure) },
+	{ "replenish_add_buff_success", IBMVETH_STAT_OFF(replenish_add_buff_success) },
+	{ "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
+	{ "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
+	{ "tx_multidesc_send", IBMVETH_STAT_OFF(tx_multidesc_send) },
+	{ "tx_linearized", IBMVETH_STAT_OFF(tx_linearized) },
+	{ "tx_linearize_failed", IBMVETH_STAT_OFF(tx_linearize_failed) },
+	{ "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
+	{ "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) }
+};
+
 /* simple methods of getting data from the current rxq entry */
 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 {

@@ -756,6 +778,32 @@ static u32 ibmveth_get_rx_csum(struct ne
 	return adapter->rx_csum;
 }
 
+static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
+{
+	int i;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
+		memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
+}
+
+static int ibmveth_get_stats_count(struct net_device *dev)
+{
+	return ARRAY_SIZE(ibmveth_stats);
+}
+
+static void ibmveth_get_ethtool_stats(struct net_device *dev,
+				      struct ethtool_stats *stats, u64 *data)
+{
+	int i;
+	struct ibmveth_adapter *adapter = dev->priv;
+
+	for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
+		data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
+}
+
 static const struct ethtool_ops netdev_ethtool_ops = {
 	.get_drvinfo		= netdev_get_drvinfo,
 	.get_settings		= netdev_get_settings,

@@ -766,7 +814,10 @@ static const struct ethtool_ops netdev_e
 	.get_rx_csum		= ibmveth_get_rx_csum,
 	.set_rx_csum		= ibmveth_set_rx_csum,
 	.get_tso			= ethtool_op_get_tso,
-	.get_ufo			= ethtool_op_get_ufo
+	.get_ufo			= ethtool_op_get_ufo,
+	.get_strings		= ibmveth_get_strings,
+	.get_stats_count		= ibmveth_get_stats_count,
+	.get_ethtool_stats	= ibmveth_get_ethtool_stats
 };
 
 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)