summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/Kconfig6
-rw-r--r--drivers/scsi/Makefile1
-rw-r--r--drivers/scsi/scsi.c3
-rw-r--r--drivers/scsi/scsi_netlink.c199
-rw-r--r--drivers/scsi/scsi_priv.h11
-rw-r--r--drivers/scsi/scsi_transport_fc.c200
6 files changed, 419 insertions, 1 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index c8c606589ea6..4d1998d23f0f 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -27,6 +27,11 @@ config SCSI
However, do not compile this as a module if your root file system
(the one containing the directory /) is located on a SCSI device.
+config SCSI_NETLINK
+ tristate
+ default n
+ select NET
+
config SCSI_PROC_FS
bool "legacy /proc/scsi/ support"
depends on SCSI && PROC_FS
@@ -222,6 +227,7 @@ config SCSI_SPI_ATTRS
config SCSI_FC_ATTRS
tristate "FiberChannel Transport Attributes"
depends on SCSI
+ select SCSI_NETLINK
help
If you wish to export transport-specific information about
each attached FiberChannel device to sysfs, say Y.
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index fd9aeb1ba07f..8fc2c594b537 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -159,6 +159,7 @@ scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \
scsicam.o scsi_error.o scsi_lib.o \
scsi_scan.o scsi_sysfs.o \
scsi_devinfo.o
+scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 37843927e47f..eedfd059b82b 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -1118,6 +1118,8 @@ static int __init init_scsi(void)
for_each_possible_cpu(i)
INIT_LIST_HEAD(&per_cpu(scsi_done_q, i));
+ scsi_netlink_init();
+
printk(KERN_NOTICE "SCSI subsystem initialized\n");
return 0;
@@ -1138,6 +1140,7 @@ cleanup_queue:
static void __exit exit_scsi(void)
{
+ scsi_netlink_exit();
scsi_sysfs_unregister();
scsi_exit_sysctl();
scsi_exit_hosts();
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
new file mode 100644
index 000000000000..1b59b27e887f
--- /dev/null
+++ b/drivers/scsi/scsi_netlink.c
@@ -0,0 +1,199 @@
+/*
+ * scsi_netlink.c - SCSI Transport Netlink Interface
+ *
+ * Copyright (C) 2006 James Smart, Emulex Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <linux/time.h>
+#include <linux/jiffies.h>
+#include <linux/security.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+
+#include <scsi/scsi_netlink.h>
+#include "scsi_priv.h"
+
+struct sock *scsi_nl_sock = NULL;
+EXPORT_SYMBOL_GPL(scsi_nl_sock);
+
+
+/**
+ * scsi_nl_rcv_msg -
+ * Receive message handler. Extracts message from a receive buffer.
+ * Validates message header and calls appropriate transport message handler
+ *
+ * @skb: socket receive buffer
+ *
+ **/
+static void
+scsi_nl_rcv_msg(struct sk_buff *skb)
+{
+ struct nlmsghdr *nlh;
+ struct scsi_nl_hdr *hdr;
+ uint32_t rlen;
+ int err;
+
+ while (skb->len >= NLMSG_SPACE(0)) {
+ err = 0;
+
+ nlh = (struct nlmsghdr *) skb->data;
+ if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
+ (skb->len < nlh->nlmsg_len)) {
+ printk(KERN_WARNING "%s: discarding partial skb\n",
+ __FUNCTION__);
+ return;
+ }
+
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+
+ if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) {
+ err = -EBADMSG;
+ goto next_msg;
+ }
+
+ hdr = NLMSG_DATA(nlh);
+ if ((hdr->version != SCSI_NL_VERSION) ||
+ (hdr->magic != SCSI_NL_MAGIC)) {
+ err = -EPROTOTYPE;
+ goto next_msg;
+ }
+
+ if (security_netlink_recv(skb, CAP_SYS_ADMIN)) {
+ err = -EPERM;
+ goto next_msg;
+ }
+
+ if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) {
+ printk(KERN_WARNING "%s: discarding partial message\n",
+ __FUNCTION__);
+ return;
+ }
+
+ /*
+ * We currently don't support anyone sending us a message
+ */
+
+next_msg:
+ if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
+ netlink_ack(skb, nlh, err);
+
+ skb_pull(skb, rlen);
+ }
+}
+
+
+/**
+ * scsi_nl_rcv_msg -
+ * Receive handler for a socket. Extracts a received message buffer from
+ * the socket, and starts message processing.
+ *
+ * @sk: socket
+ * @len: unused
+ *
+ **/
+static void
+scsi_nl_rcv(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
+ scsi_nl_rcv_msg(skb);
+ kfree_skb(skb);
+ }
+}
+
+
+/**
+ * scsi_nl_rcv_event -
+ * Event handler for a netlink socket.
+ *
+ * @this: event notifier block
+ * @event: event type
+ * @ptr: event payload
+ *
+ **/
+static int
+scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct netlink_notify *n = ptr;
+
+ if (n->protocol != NETLINK_SCSITRANSPORT)
+ return NOTIFY_DONE;
+
+ /*
+ * Currently, we are not tracking PID's, etc. There is nothing
+ * to handle.
+ */
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block scsi_netlink_notifier = {
+ .notifier_call = scsi_nl_rcv_event,
+};
+
+
+/**
+ * scsi_netlink_init -
+ * Called by SCSI subsystem to intialize the SCSI transport netlink
+ * interface
+ *
+ **/
+void
+scsi_netlink_init(void)
+{
+ int error;
+
+ error = netlink_register_notifier(&scsi_netlink_notifier);
+ if (error) {
+ printk(KERN_ERR "%s: register of event handler failed - %d\n",
+ __FUNCTION__, error);
+ return;
+ }
+
+ scsi_nl_sock = netlink_kernel_create(NETLINK_SCSITRANSPORT,
+ SCSI_NL_GRP_CNT, scsi_nl_rcv, THIS_MODULE);
+ if (!scsi_nl_sock) {
+ printk(KERN_ERR "%s: register of recieve handler failed\n",
+ __FUNCTION__);
+ netlink_unregister_notifier(&scsi_netlink_notifier);
+ }
+
+ return;
+}
+
+
+/**
+ * scsi_netlink_exit -
+ * Called by SCSI subsystem to disable the SCSI transport netlink
+ * interface
+ *
+ **/
+void
+scsi_netlink_exit(void)
+{
+ if (scsi_nl_sock) {
+ sock_release(scsi_nl_sock->sk_socket);
+ netlink_unregister_notifier(&scsi_netlink_notifier);
+ }
+
+ return;
+}
+
+
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index ae24c85aaeea..5d023d44e5e7 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -8,6 +8,7 @@ struct scsi_cmnd;
struct scsi_device;
struct scsi_host_template;
struct Scsi_Host;
+struct scsi_nl_hdr;
/*
@@ -110,6 +111,16 @@ extern void __scsi_remove_device(struct scsi_device *);
extern struct bus_type scsi_bus_type;
+/* scsi_netlink.c */
+#ifdef CONFIG_SCSI_NETLINK
+extern void scsi_netlink_init(void);
+extern void scsi_netlink_exit(void);
+extern struct sock *scsi_nl_sock;
+#else
+static inline void scsi_netlink_init(void) {}
+static inline void scsi_netlink_exit(void) {}
+#endif
+
/*
* internal scsi timeout functions: for use by mid-layer and transport
* classes.
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 79d31ca2b741..05989f130554 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -32,6 +32,9 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_cmnd.h>
+#include <linux/netlink.h>
+#include <net/netlink.h>
+#include <scsi/scsi_netlink_fc.h>
#include "scsi_priv.h"
static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
@@ -93,6 +96,29 @@ fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN 50
+/* Convert fc_host_event_code values to ascii string name */
+static const struct {
+ enum fc_host_event_code value;
+ char *name;
+} fc_host_event_code_names[] = {
+ { FCH_EVT_LIP, "lip" },
+ { FCH_EVT_LINKUP, "link_up" },
+ { FCH_EVT_LINKDOWN, "link_down" },
+ { FCH_EVT_LIPRESET, "lip_reset" },
+ { FCH_EVT_RSCN, "rscn" },
+ { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
+ { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
+ { FCH_EVT_PORT_ONLINE, "port_online" },
+ { FCH_EVT_PORT_OFFLINE, "port_offline" },
+ { FCH_EVT_PORT_FABRIC, "port_fabric" },
+ { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
+ { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
+};
+fc_enum_name_search(host_event_code, fc_host_event_code,
+ fc_host_event_code_names)
+#define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
+
+
/* Convert fc_port_state values to ascii string name */
static struct {
enum fc_port_state value;
@@ -377,10 +403,182 @@ MODULE_PARM_DESC(dev_loss_tmo,
" exceeded, the scsi target is removed. Value should be"
" between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
+/**
+ * Netlink Infrastructure
+ **/
+
+static atomic_t fc_event_seq;
+
+/**
+ * fc_get_event_number - Obtain the next sequential FC event number
+ *
+ * Notes:
+ * We could have inline'd this, but it would have required fc_event_seq to
+ * be exposed. For now, live with the subroutine call.
+ * Atomic used to avoid lock/unlock...
+ **/
+u32
+fc_get_event_number(void)
+{
+ return atomic_add_return(1, &fc_event_seq);
+}
+EXPORT_SYMBOL(fc_get_event_number);
+
+
+/**
+ * fc_host_post_event - called to post an even on an fc_host.
+ *
+ * @shost: host the event occurred on
+ * @event_number: fc event number obtained from get_fc_event_number()
+ * @event_code: fc_host event being posted
+ * @event_data: 32bits of data for the event being posted
+ *
+ * Notes:
+ * This routine assumes no locks are held on entry.
+ **/
+void
+fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
+ enum fc_host_event_code event_code, u32 event_data)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ struct fc_nl_event *event;
+ const char *name;
+ u32 len, skblen;
+ int err;
+
+ if (!scsi_nl_sock) {
+ err = -ENOENT;
+ goto send_fail;
+ }
+
+ len = FC_NL_MSGALIGN(sizeof(*event));
+ skblen = NLMSG_SPACE(len);
+
+ skb = alloc_skb(skblen, GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto send_fail;
+ }
+
+ nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
+ skblen - sizeof(*nlh), 0);
+ if (!nlh) {
+ err = -ENOBUFS;
+ goto send_fail_skb;
+ }
+ event = NLMSG_DATA(nlh);
+
+ INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
+ FC_NL_ASYNC_EVENT, len);
+ event->seconds = get_seconds();
+ event->vendor_id = 0;
+ event->host_no = shost->host_no;
+ event->event_datalen = sizeof(u32); /* bytes */
+ event->event_num = event_number;
+ event->event_code = event_code;
+ event->event_data = event_data;
+
+ err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS);
+ if (err && (err != -ESRCH)) /* filter no recipient errors */
+ /* nlmsg_multicast already kfree_skb'd */
+ goto send_fail;
+
+ return;
+
+send_fail_skb:
+ kfree_skb(skb);
+send_fail:
+ name = get_fc_host_event_code_name(event_code);
+ printk(KERN_WARNING
+ "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
+ __FUNCTION__, shost->host_no,
+ (name) ? name : "<unknown>", event_data, err);
+ return;
+}
+EXPORT_SYMBOL(fc_host_post_event);
+
+
+/**
+ * fc_host_post_vendor_event - called to post a vendor unique event on
+ * a fc_host
+ *
+ * @shost: host the event occurred on
+ * @event_number: fc event number obtained from get_fc_event_number()
+ * @data_len: amount, in bytes, of vendor unique data
+ * @data_buf: pointer to vendor unique data
+ *
+ * Notes:
+ * This routine assumes no locks are held on entry.
+ **/
+void
+fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
+ u32 data_len, char * data_buf, u32 vendor_id)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ struct fc_nl_event *event;
+ u32 len, skblen;
+ int err;
+
+ if (!scsi_nl_sock) {
+ err = -ENOENT;
+ goto send_vendor_fail;
+ }
+
+ len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
+ skblen = NLMSG_SPACE(len);
+
+ skb = alloc_skb(skblen, GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto send_vendor_fail;
+ }
+
+ nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
+ skblen - sizeof(*nlh), 0);
+ if (!nlh) {
+ err = -ENOBUFS;
+ goto send_vendor_fail_skb;
+ }
+ event = NLMSG_DATA(nlh);
+
+ INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
+ FC_NL_ASYNC_EVENT, len);
+ event->seconds = get_seconds();
+ event->vendor_id = vendor_id;
+ event->host_no = shost->host_no;
+ event->event_datalen = data_len; /* bytes */
+ event->event_num = event_number;
+ event->event_code = FCH_EVT_VENDOR_UNIQUE;
+ memcpy(&event->event_data, data_buf, data_len);
+
+ err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS);
+ if (err && (err != -ESRCH)) /* filter no recipient errors */
+ /* nlmsg_multicast already kfree_skb'd */
+ goto send_vendor_fail;
+
+ return;
+
+send_vendor_fail_skb:
+ kfree_skb(skb);
+send_vendor_fail:
+ printk(KERN_WARNING
+ "%s: Dropped Event : host %d vendor_unique - err %d\n",
+ __FUNCTION__, shost->host_no, err);
+ return;
+}
+EXPORT_SYMBOL(fc_host_post_vendor_event);
+
+
static __init int fc_transport_init(void)
{
- int error = transport_class_register(&fc_host_class);
+ int error;
+
+ atomic_set(&fc_event_seq, 0);
+
+ error = transport_class_register(&fc_host_class);
if (error)
return error;
error = transport_class_register(&fc_rport_class);