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Date: Fri, 22 Aug 2008 11:38:32 -0700
From: Karen Xie <kxie@...lsio.com>
To: netdev@...r.kernel.org, open-iscsi@...glegroups.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jgarzik@...ox.com, davem@...emloft.net, michaelc@...wisc.edu,
swise@...ngridcomputing.com, rdreier@...co.com, daisyc@...ibm.com,
wenxiong@...ibm.com, bhua@...ibm.com, divy@...lsio.com,
dm@...lsio.com, leedom@...lsio.com, kxie@...lsio.com
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@...lsio.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@...lsio.com>
---
drivers/net/cxgb3/adapter.h | 1 +
drivers/net/cxgb3/cxgb3_ctl_defs.h | 7 ++++
drivers/net/cxgb3/cxgb3_main.c | 65 ++++++++++++++++++++++++++++++++++++
drivers/net/cxgb3/cxgb3_offload.c | 6 +++
4 files changed, 79 insertions(+), 0 deletions(-)
diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2711404..0e4fe95 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_ipaddr;
};
enum { /* adapter flags */
diff --git a/drivers/net/cxgb3/cxgb3_ctl_defs.h b/drivers/net/cxgb3/cxgb3_ctl_defs.h
index 6ad9240..e171aa8 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_IPADDR = 51,
};
/*
@@ -86,6 +87,12 @@ struct iff_mac {
u16 vlan_tag;
};
+/* Structure used to request a port's iSCSI IP address */
+struct iscsi_ipaddr {
+ struct net_device *dev; /* the net_device */
+ __be32 ipaddr; /* the return iSCSI IP address */
+};
+
struct pci_dev;
/*
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 5447f3e..1c8952c 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -687,6 +687,66 @@ static struct attribute *offload_attrs[] = {
static struct attribute_group offload_attr_group = {.attrs = offload_attrs };
+static ssize_t iscsi_ipaddr_attr_show(struct device *d,
+ char *buf)
+{
+ struct port_info *pi = netdev_priv(to_net_dev(d));
+ __be32 a = ntohl(pi->iscsi_ipaddr);
+
+ return sprintf(buf, "%d.%d.%d.%d\n",
+ (a >> 24) & 0xff,
+ (a >> 16) & 0xff,
+ (a >> 8) & 0xff,
+ (a >> 0) & 0xff);
+}
+
+static ssize_t iscsi_ipaddr_attr_store(struct device *d,
+ const char *buf, size_t len)
+{
+ struct port_info *pi = netdev_priv(to_net_dev(d));
+ __be32 a = 0;
+ unsigned long octet;
+ const char *parse = buf;
+ char *endp;
+ int i;
+
+ for (i = 1; i <= 4; i++) {
+ octet = simple_strtoul(parse, &endp, 10);
+ if (endp == buf || octet > 255 ||
+ (i < 4 && *endp != '.') ||
+ (i == 4 && *endp != '\0' && *endp != '\n'))
+ return -EINVAL;
+ a = (a << 8) | octet;
+ parse = endp+1;
+ }
+ pi->iscsi_ipaddr = htonl(a);
+ return endp-buf;
+}
+
+#define ISCSI_IPADDR_ATTR(name) \
+static ssize_t show_##name(struct device *d, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ return iscsi_ipaddr_attr_show(d, buf); \
+} \
+static ssize_t store_##name(struct device *d, struct device_attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ return iscsi_ipaddr_attr_store(d, buf, len); \
+} \
+static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_##name, store_##name)
+
+ISCSI_IPADDR_ATTR(iscsi_ipaddr);
+
+static struct attribute *iscsi_offload_attrs[] = {
+ &dev_attr_iscsi_ipaddr.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 +1138,7 @@ 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 +1161,9 @@ 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);
@@ -2681,6 +2745,7 @@ static int __devinit init_one(struct pci_dev *pdev,
pi->first_qset = i;
pi->activity = 0;
pi->port_id = i;
+ pi->iscsi_ipaddr = 0;
netif_carrier_off(netdev);
netdev->irq = pdev->irq;
netdev->mem_start = mmio_start;
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index c5b3de1..d5687dc 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_IPADDR: {
+ struct iscsi_ipaddr *p = data;
+ struct port_info *pi = netdev_priv(p->dev);
+ p->ipaddr = pi->iscsi_ipaddr;
+ break;
+ }
default:
return -EOPNOTSUPP;
}
--
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