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authorMike Christie <michaelc@cs.wisc.edu>2011-07-25 13:48:50 -0500
committerJames Bottomley <JBottomley@Parallels.com>2011-08-27 08:36:21 -0600
commit90eeb01a038e5fec0efdea4df008f3c18f67b82c (patch)
tree9977dd9000374e1162f56934efcf0e5b8c7c7155 /drivers/scsi/scsi_transport_iscsi.c
parent6ac73e8cb02e65abeb2f8d43f0fe48e485444b44 (diff)
downloadlinux-90eeb01a038e5fec0efdea4df008f3c18f67b82c.tar.bz2
[SCSI] iscsi class: add bsg support to iscsi class
This patch adds bsg support to the iscsi class. There is only 1 request, the host vendor one, supported. It is expected that this would be used for things like flash updates. This patch is made over this one http://marc.info/?l=linux-scsi&m=131149780020992&w=2 Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c114
1 files changed, 113 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 13f90515ff6e..cde679f1b01d 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/bsg-lib.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
@@ -31,6 +32,7 @@
#include <scsi/scsi_transport_iscsi.h>
#include <scsi/iscsi_if.h>
#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_bsg_iscsi.h>
#define ISCSI_TRANSPORT_VERSION "2.0-870"
@@ -447,6 +449,99 @@ void iscsi_destroy_iface(struct iscsi_iface *iface)
}
EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
+/*
+ * BSG support
+ */
+/**
+ * iscsi_bsg_host_dispatch - Dispatch command to LLD.
+ * @job: bsg job to be processed
+ */
+static int iscsi_bsg_host_dispatch(struct bsg_job *job)
+{
+ struct Scsi_Host *shost = iscsi_job_to_shost(job);
+ struct iscsi_bsg_request *req = job->request;
+ struct iscsi_bsg_reply *reply = job->reply;
+ struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+ int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
+ int ret;
+
+ /* check if we have the msgcode value at least */
+ if (job->request_len < sizeof(uint32_t)) {
+ ret = -ENOMSG;
+ goto fail_host_msg;
+ }
+
+ /* Validate the host command */
+ switch (req->msgcode) {
+ case ISCSI_BSG_HST_VENDOR:
+ cmdlen += sizeof(struct iscsi_bsg_host_vendor);
+ if ((shost->hostt->vendor_id == 0L) ||
+ (req->rqst_data.h_vendor.vendor_id !=
+ shost->hostt->vendor_id)) {
+ ret = -ESRCH;
+ goto fail_host_msg;
+ }
+ break;
+ default:
+ ret = -EBADR;
+ goto fail_host_msg;
+ }
+
+ /* check if we really have all the request data needed */
+ if (job->request_len < cmdlen) {
+ ret = -ENOMSG;
+ goto fail_host_msg;
+ }
+
+ ret = i->iscsi_transport->bsg_request(job);
+ if (!ret)
+ return 0;
+
+fail_host_msg:
+ /* return the errno failure code as the only status */
+ BUG_ON(job->reply_len < sizeof(uint32_t));
+ reply->reply_payload_rcv_len = 0;
+ reply->result = ret;
+ job->reply_len = sizeof(uint32_t);
+ bsg_job_done(job, ret, 0);
+ return 0;
+}
+
+/**
+ * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
+ * @shost: shost for iscsi_host
+ * @cls_host: iscsi_cls_host adding the structures to
+ */
+static int
+iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
+{
+ struct device *dev = &shost->shost_gendev;
+ struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+ struct request_queue *q;
+ char bsg_name[20];
+ int ret;
+
+ if (!i->iscsi_transport->bsg_request)
+ return -ENOTSUPP;
+
+ snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
+
+ q = __scsi_alloc_queue(shost, bsg_request_fn);
+ if (!q)
+ return -ENOMEM;
+
+ ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
+ if (ret) {
+ shost_printk(KERN_ERR, shost, "bsg interface failed to "
+ "initialize - no request queue\n");
+ blk_cleanup_queue(q);
+ return ret;
+ }
+
+ ihost->bsg_q = q;
+ return 0;
+}
+
static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
struct device *cdev)
{
@@ -456,13 +551,30 @@ static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
memset(ihost, 0, sizeof(*ihost));
atomic_set(&ihost->nr_scans, 0);
mutex_init(&ihost->mutex);
+
+ iscsi_bsg_host_add(shost, ihost);
+ /* ignore any bsg add error - we just can't do sgio */
+
+ return 0;
+}
+
+static int iscsi_remove_host(struct transport_container *tc,
+ struct device *dev, struct device *cdev)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct iscsi_cls_host *ihost = shost->shost_data;
+
+ if (ihost->bsg_q) {
+ bsg_remove_queue(ihost->bsg_q);
+ blk_cleanup_queue(ihost->bsg_q);
+ }
return 0;
}
static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
"iscsi_host",
iscsi_setup_host,
- NULL,
+ iscsi_remove_host,
NULL);
static DECLARE_TRANSPORT_CLASS(iscsi_session_class,