[SCSI] qla4xxx: support iscsiadm session mgmt

Add scsi_transport_iscsi hooks in qla4xxx to support
iSCSI session management using iscsiadm.

This patch is based on discussion here
http://groups.google.com/group/open-iscsi/browse_thread/thread/e89fd888baf656a0#

Now users can use iscsiadm to do target discovery and do login/logout to
individual targets using the qla4xxx iSCSI class interface.

This patch leaves some dead code, but to make it easier to review
we are leaving and in the next patch we will remove that old code.

V2 - NOTE: Added code to avoid waiting for AEN during login/logout
in the driver, instead added a kernel to user event
to notify iscsid about login status. Because of this
iscsid will not get blocked.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 32 insertions, 4 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index b17f5c43bbe4..3e404fe8e36d 100644
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -36,9 +36,12 @@
 #include <scsi/scsi_transport_iscsi.h>
 #include <scsi/scsi_bsg_iscsi.h>
 #include <scsi/scsi_netlink.h>
+#include <scsi/libiscsi.h>
 
 #include "ql4_dbg.h"
 #include "ql4_nx.h"
+#include "ql4_fw.h"
+#include "ql4_nvram.h"
 
 #ifndef PCI_DEVICE_ID_QLOGIC_ISP4010
 #define PCI_DEVICE_ID_QLOGIC_ISP4010    0x4010
@@ -112,7 +115,7 @@
 #define MAX_BUSES               1
 #define MAX_TARGETS             MAX_DEV_DB_ENTRIES
 #define MAX_LUNS                0xffff
-#define MAX_AEN_ENTRIES         256 /* should be > EXT_DEF_MAX_AEN_QUEUE */
+#define MAX_AEN_ENTRIES         MAX_DEV_DB_ENTRIES
 #define MAX_DDB_ENTRIES         MAX_DEV_DB_ENTRIES
 #define MAX_PDU_ENTRIES         32
 #define INVALID_ENTRY           0xFFFF
@@ -296,8 +299,6 @@ struct ddb_entry {
 #define DF_FO_MASKED            3
 
 
-#include "ql4_fw.h"
-#include "ql4_nvram.h"
 
 struct ql82xx_hw_data {
         /* Offsets for flash/nvram access (set to ~0 if not used). */
@@ -607,6 +608,33 @@ struct scsi_qla_host {
 #define QLFLASH_WAITING         0
 #define QLFLASH_READING         1
 #define QLFLASH_WRITING         2
+        struct dma_pool *chap_dma_pool;
+#define CHAP_DMA_BLOCK_SIZE    512
+        struct workqueue_struct *task_wq;
+        unsigned long ddb_idx_map[MAX_DDB_ENTRIES / BITS_PER_LONG];
+};
+
+struct ql4_task_data {
+        struct scsi_qla_host *ha;
+        uint8_t iocb_req_cnt;
+        dma_addr_t data_dma;
+        void *req_buffer;
+        dma_addr_t req_dma;
+        void *resp_buffer;
+        dma_addr_t resp_dma;
+        uint32_t resp_len;
+        struct iscsi_task *task;
+        struct passthru_status sts;
+        struct work_struct task_work;
+};
+
+struct qla_endpoint {
+        struct Scsi_Host *host;
+        struct sockaddr dst_addr;
+};
+
+struct qla_conn {
+        struct qla_endpoint *qla_ep;
 };
 
 static inline int is_ipv4_enabled(struct scsi_qla_host *ha)
@@ -657,7 +685,7 @@ static inline int adapter_up(struct scsi_qla_host *ha)
 
 static inline struct scsi_qla_host* to_qla_host(struct Scsi_Host *shost)
 {
-        return (struct scsi_qla_host *)shost->hostdata;
+        return (struct scsi_qla_host *)iscsi_host_priv(shost);
 }
 
 static inline void __iomem* isp_semaphore(struct scsi_qla_host *ha)