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Date: Fri, 22 Aug 2008 12:08:51 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Karen Xie <kxie@...lsio.com>
Cc: netdev@...r.kernel.org, open-iscsi@...glegroups.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
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: Re: [PATCH 1/4 2.6.28] cxgb3 - manage a private ip address for
iSCSI
On Fri, 22 Aug 2008 11:38:32 -0700
Karen Xie <kxie@...lsio.com> wrote:
> [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)
could fit in a single 80-col line.
> +{
> + 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);
Use NIPQUAD and NIPQUAD_FMT here?
> +}
> +
> +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;
There's not really any need to use __be32 in kernel code. Plain old
be23 is fine.
> + 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;
> +}
This appears to be taking a dotted quad ipv4 address in ascii form,
turning it into a u32 while performing checking?
Surely we have a library function somewhere in networking which does
this? If not, I'd suggest writing one.
> +#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;
> }
I'm wondering about ipv6. Will it never ever be supported?
Even if not, it would perhaps be clearer if this was called
GET_ISCSI_IPV4ADDR?
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