This patch adds support to the scsi transport layer for passing hba specific netlink messages to a low level driver. Also support is added to the fc transport, to enable an FC hba driver to post netlink message to a specific user process.
Signed-off-by: David C Somayajulu <david.somayajulu@xxxxxxxxxx>
---
drivers/scsi/scsi_netlink.c | 13 +++++++
drivers/scsi/scsi_transport_fc.c | 72 ++++++++++++++++++++++++++++++++++++++
include/scsi/scsi_host.h | 6 +++
include/scsi/scsi_netlink.h | 3 +-
include/scsi/scsi_transport_fc.h | 2 +
5 files changed, 95 insertions(+), 1 deletions(-)
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index ae7ed9a..3bc85c9 100644
--- a/drivers/scsi/scsi_netlink.c
+++ b/drivers/scsi/scsi_netlink.c
@@ -24,6 +24,7 @@
#include <net/sock.h>
#include <net/netlink.h>
+#include <scsi/scsi_host.h>
#include <scsi/scsi_netlink.h>
#include "scsi_priv.h"
@@ -47,6 +48,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
struct scsi_nl_hdr *hdr;
uint32_t rlen;
int err;
+ struct Scsi_Host *shost;
while (skb->len >= NLMSG_SPACE(0)) {
err = 0;
@@ -89,6 +91,17 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
/*
* We currently don't support anyone sending us a message
*/
+ if (hdr->msgtype == SCSI_NL_HOST_PRIVATE) {
+ shost = scsi_host_lookup(hdr->host_no);
+ if (!shost) {
+ printk(KERN_ERR "%s: scsi_host_lookup failed "
+ "host no %u\n", __FUNCTION__, hdr->host_no);
+ } else if (shost->hostt->netlink_rcv_msg) {
+ err = shost->hostt->netlink_rcv_msg(shost,
+ (void *)((char *)hdr+sizeof(*hdr)),
+ hdr->msglen, NETLINK_CREDS(skb)->pid);
+ }
+ }
next_msg:
if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index cb971f0..d1b38d9 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -627,6 +627,78 @@ EXPORT_SYMBOL(fc_host_post_vendor_event);
+/**
+ * fc_host_post_vendor_event_to_pid - called to post a vendor unique event
+ * on an fc_host to a specific process
+ * @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
+ * @vendor_id: Vendor id
+ * @pid: proc id of the receiver
+ *
+ * Notes:
+ * This routine assumes no locks are held on entry.
+ */
+void
+fc_host_post_vendor_event_to_pid(struct Scsi_Host *shost, u32 event_number,
+ u32 data_len, char * data_buf, u64 vendor_id, uint32_t pid)
+{
+ 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_unicast(scsi_nl_sock, skb, pid);
+ 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_to_pid);
+
static __init int fc_transport_init(void)
{
int error;
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 44a55d1..04afe93 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -485,6 +485,12 @@ struct scsi_host_template {
* module_init/module_exit.
*/
struct list_head legacy_hosts;
+ /*
+ * passes host specific to netlink messages received on scsi_nl_sock
+ * to the LLD
+ */
+ int (* netlink_rcv_msg)(struct Scsi_Host *, void *payload, uint32_t len,
+ uint32_t pid);
};
/*
diff --git a/include/scsi/scsi_netlink.h b/include/scsi/scsi_netlink.h
index 8c1470c..b32596e 100644
--- a/include/scsi/scsi_netlink.h
+++ b/include/scsi/scsi_netlink.h
@@ -42,6 +42,7 @@ struct scsi_nl_hdr {
uint16_t magic;
uint16_t msgtype;
uint16_t msglen;
+ uint16_t host_no;
} __attribute__((aligned(sizeof(uint64_t))));
/* scsi_nl_hdr->version value */
@@ -56,7 +57,7 @@ struct scsi_nl_hdr {
#define SCSI_NL_MAX_TRANSPORTS 2
/* scsi_nl_hdr->msgtype values are defined in each transport */
-
+#define SCSI_NL_HOST_PRIVATE 1
/*
* Vendor ID:
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 21018a4..217fdc9 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -747,6 +747,8 @@ void fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
enum fc_host_event_code event_code, u32 event_data);
void fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
u32 data_len, char * data_buf, u64 vendor_id);
+void fc_host_post_vendor_event_to_pid(struct Scsi_Host *shost, u32 event_number,
+ u32 data_len, char * data_buf, u64 vendor_id, uint32_t pid);
/* Note: when specifying vendor_id to fc_host_post_vendor_event()
* be sure to read the Vendor Type and ID formatting requirements
* specified in scsi_netlink.h
--
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