[SCSI] libsas: add SAS management protocol handler
This patch adds support for SAS Management Protocol (SMP) passthrough
support via bsg. aic94xx can use this.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 969fd3e..a811953 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -23,6 +23,7 @@
*/
#include <linux/scatterlist.h>
+#include <linux/blkdev.h>
#include "sas_internal.h"
@@ -1972,3 +1973,50 @@
return res;
}
#endif
+
+int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
+ struct request *req)
+{
+ struct domain_device *dev;
+ int ret, type = rphy->identify.device_type;
+ struct request *rsp = req->next_rq;
+
+ if (!rsp) {
+ printk("%s: space for a smp response is missing\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ /* seems aic94xx doesn't support */
+ if (!rphy) {
+ printk("%s: can we send a smp request to a host?\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ if (type != SAS_EDGE_EXPANDER_DEVICE &&
+ type != SAS_FANOUT_EXPANDER_DEVICE) {
+ printk("%s: can we send a smp request to a device?\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ dev = sas_find_dev_by_rphy(rphy);
+ if (!dev) {
+ printk("%s: fail to find a domain_device?\n", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ /* do we need to support multiple segments? */
+ if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
+ printk("%s: multiple segments req %u %u, rsp %u %u\n",
+ __FUNCTION__, req->bio->bi_vcnt, req->data_len,
+ rsp->bio->bi_vcnt, rsp->data_len);
+ return -EINVAL;
+ }
+
+ ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
+ bio_data(rsp->bio), rsp->data_len);
+
+ return ret;
+}