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Subject[PATCH 1/4 2.6.28] cxgb3 - manage a private ip address for iSCSI
[PATCH 1/4 2.6.28] cxgb3 - manage a private ip address for iSCSI

From: Karen Xie <kxie@chelsio.com>

Create a per port sysfs entry to pass an IP address to the NIC driver, and a control call for the iSCSI driver to grab it.
The IP address is required in both drivers to manage ARP requests and connection set up.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
---

drivers/net/cxgb3/adapter.h | 1 +
drivers/net/cxgb3/cxgb3_ctl_defs.h | 7 +++++
drivers/net/cxgb3/cxgb3_main.c | 46 ++++++++++++++++++++++++++++++++++++
drivers/net/cxgb3/cxgb3_offload.c | 6 +++++
4 files changed, 60 insertions(+), 0 deletions(-)


diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2711404..adc2f13 100644
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -64,6 +64,7 @@ struct port_info {
struct link_config link_config;
struct net_device_stats netstats;
int activity;
+ __be32 iscsi_ipv4addr;
};

enum { /* adapter flags */
diff --git a/drivers/net/cxgb3/cxgb3_ctl_defs.h b/drivers/net/cxgb3/cxgb3_ctl_defs.h
index 6ad9240..2bf5027 100644
--- a/drivers/net/cxgb3/cxgb3_ctl_defs.h
+++ b/drivers/net/cxgb3/cxgb3_ctl_defs.h
@@ -57,6 +57,7 @@ enum {
RDMA_GET_MIB = 19,

GET_RX_PAGE_INFO = 50,
+ GET_ISCSI_IPV4ADDR = 51,
};

/*
@@ -86,6 +87,12 @@ struct iff_mac {
u16 vlan_tag;
};

+/* Structure used to request a port's iSCSI IPv4 address */
+struct iscsi_ipv4addr {
+ struct net_device *dev; /* the net_device */
+ __be32 ipv4addr; /* the return iSCSI IPv4 address */
+};
+
struct pci_dev;

/*
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 5447f3e..4f72c06 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -34,6 +34,7 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
+#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
@@ -687,6 +688,47 @@ static struct attribute *offload_attrs[] = {

static struct attribute_group offload_attr_group = {.attrs = offload_attrs };

+static ssize_t iscsi_ipv4addr_attr_show(struct device *d, char *buf)
+{
+ struct port_info *pi = netdev_priv(to_net_dev(d));
+ __be32 a = pi->iscsi_ipv4addr;
+
+ return sprintf(buf, NIPQUAD_FMT "\n", NIPQUAD(a));
+}
+
+static ssize_t iscsi_ipv4addr_attr_store(struct device *d,
+ const char *buf, size_t len)
+{
+ struct port_info *pi = netdev_priv(to_net_dev(d));
+
+ pi->iscsi_ipv4addr = in_aton(buf);
+ return len;
+}
+
+#define ISCSI_IPADDR_ATTR(name) \
+static ssize_t show_##name(struct device *d, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ return iscsi_ipv4addr_attr_show(d, buf); \
+} \
+static ssize_t store_##name(struct device *d, struct device_attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ return iscsi_ipv4addr_attr_store(d, buf, len); \
+} \
+static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_##name, store_##name)
+
+ISCSI_IPADDR_ATTR(iscsi_ipv4addr);
+
+static struct attribute *iscsi_offload_attrs[] = {
+ &dev_attr_iscsi_ipv4addr.attr,
+ NULL
+};
+
+static struct attribute_group iscsi_offload_attr_group = {
+ .attrs = iscsi_offload_attrs
+};
+
/*
* Sends an sk_buff to an offload queue driver
* after dealing with any active network taps.
@@ -1078,6 +1120,7 @@ static int cxgb_open(struct net_device *dev)
if (err)
printk(KERN_WARNING
"Could not initialize offload capabilities\n");
+ sysfs_create_group(&dev->dev.kobj, &iscsi_offload_attr_group);
}

link_start(dev);
@@ -1100,6 +1143,9 @@ static int cxgb_close(struct net_device *dev)
netif_carrier_off(dev);
t3_mac_disable(&pi->mac, MAC_DIRECTION_TX | MAC_DIRECTION_RX);

+ if (is_offload(adapter) && !ofld_disable)
+ sysfs_remove_group(&dev->dev.kobj, &iscsi_offload_attr_group);
+
spin_lock(&adapter->work_lock); /* sync with update task */
clear_bit(pi->port_id, &adapter->open_device_map);
spin_unlock(&adapter->work_lock);
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index c5b3de1..f8f4faa 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -407,6 +407,12 @@ static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
rx_page_info->page_size = tp->rx_pg_size;
rx_page_info->num = tp->rx_num_pgs;
break;
+ case GET_ISCSI_IPV4ADDR: {
+ struct iscsi_ipv4addr *p = data;
+ struct port_info *pi = netdev_priv(p->dev);
+ p->ipv4addr = pi->iscsi_ipv4addr;
+ break;
+ }
default:
return -EOPNOTSUPP;
}

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