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Date: Tue, 19 May 2009 16:58:03 -0500
From: Mike Christie <michaelc@...wisc.edu>
To: open-iscsi@...glegroups.com
CC: "davem@...emloft.net" <davem@...emloft.net>,
"James.Bottomley@...senPartnership.com"
<James.Bottomley@...senPartnership.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
Karen Xie <kxie@...lsio.com>,
Anil Veerabhadrappa <anilgv@...adcom.com>,
Benjamin Li <benli@...adcom.com>
Subject: Re: [PATCH 4/4] bnx2i: Add bnx2i iSCSI driver.
Michael Chan wrote:
>
> On Tue, 2009-05-19 at 07:22 -0700, Mike Christie wrote:
>> Michael Chan wrote:
>>> Here are the more generic NETLINK_ISCSI messages and the iscsi transport
>>> code to support them, please review.
>>>
>>> diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
>>> index d69a53a..60cb6cb 100644
>>> --- a/drivers/scsi/scsi_transport_iscsi.c
>>> +++ b/drivers/scsi/scsi_transport_iscsi.c
>>> @@ -995,6 +995,39 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
>>> }
>>> EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
>>>
>>> +int iscsi_offload_mesg(struct Scsi_Host *shost,
>>> + struct iscsi_transport *transport, uint32_t type,
>>> + char *data, uint16_t data_size)
>>> +{
>>> + struct nlmsghdr *nlh;
>>> + struct sk_buff *skb;
>>> + struct iscsi_uevent *ev;
>>> + int len = NLMSG_SPACE(sizeof(*ev) + data_size);
>>> +
>>> + skb = alloc_skb(len, GFP_ATOMIC);
>>> + if (!skb) {
>>> + printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
>>> + ev = NLMSG_DATA(nlh);
>>> + memset(ev, 0, sizeof(*ev));
>>> + ev->type = type;
>>> + ev->transport_handle = iscsi_handle(transport);
>>> + switch (type) {
>>> + case ISCSI_KEVENT_PATH_REQ:
>>> + ev->r.req_path.host_no = shost->host_no;
>>> + case ISCSI_KEVENT_IF_DOWN:
>>> + ev->r.notify_if_down.host_no = shost->host_no;
>>> + }
>>> +
>>> + memcpy((char*)ev + sizeof(*ev), data, data_size);
>>> +
>>> + return iscsi_broadcast_skb(skb, GFP_KERNEL);
>>
>> You can sync up what the gfp flag used here and for the alloc_skb call
>> above. If you have process context, you probably want to use GFP_NOIO,
>> because this could be called for reconnect for a disk in use.
>>
>> If you do not have process context then you would need to use GFP_ATOMIC.
>>
>>
>
> We have process context, but I think we should make it more general for
> other future drivers and use GFP_ATOMIC.
If you have process context just use GFP_NOIO. We can change it later
when/if a driver needs it. I think we like to avoid GFP_ATOMIC if we
can. Or just add a gfp_t argument to the function so the caller can do
what is right for them if you want to make it general.
>
>>> +}
>>> +EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
>>> +
>>> void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
>>> {
>>> struct nlmsghdr *nlh;
>>> @@ -1393,6 +1426,30 @@ iscsi_set_host_param(struct iscsi_transport *transport,
>>> }
>>>
>>> static int
>>> +iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
>>> +{
>>> + struct Scsi_Host *shost;
>>> + struct iscsi_path *params;
>>> + int err;
>>> +
>>> + if (!transport->set_path)
>>> + return -ENOSYS;
>>> +
>>> + shost = scsi_host_lookup(ev->u.set_path.host_no);
>>> + if (!shost) {
>>> + printk(KERN_ERR "set path could not find host no %u\n",
>>> + ev->u.set_path.host_no);
>>> + return -ENODEV;
>>> + }
>>> +
>>> + params = (struct iscsi_path *)((char*)ev + sizeof(*ev));
>>> + err = transport->set_path(shost, params);
>>> +
>>> + scsi_host_put(shost);
>>> + return err;
>>> +}
>>> +
>>> +static int
>>> iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>>> {
>>> int err = 0;
>>> @@ -1411,7 +1468,8 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>>> if (!try_module_get(transport->owner))
>>> return -EINVAL;
>>>
>>> - priv->daemon_pid = NETLINK_CREDS(skb)->pid;
>>> + if (nlh->nlmsg_type != ISCSI_UEVENT_PATH_UPDATE)
>>> + priv->daemon_pid = NETLINK_CREDS(skb)->pid;
>>>
>> Instead of using broadcast above and in some other places and then doing
>> this check, could we just use multicast groups or something else? The
>> events from iscsid could be in one group and then events for uip would
>> be in another?
>
> We need to do this check because we don't want the daemon_pid to be
> overwritten with a pid that is not iscsid's. If it was overwritten,
> unicast NETLINK_ISCSI messages will not reach iscsid.
>
> We can use multicast group 2 for the new messages if you prefer. This
> way, I think iscsid will not receive the new messages since it is only
> listening on group 1. The pid check will still be needed though.
>
ok.
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