[SCSI] qla4xxx: add bsg support

This patch adds bsg support to qla4xxx.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Harish Zunjarrao <harish.zunjarrao@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

6 files changed, 238 insertions, 1 deletions

diff --git a/drivers/scsi/qla4xxx/Makefile b/drivers/scsi/qla4xxx/Makefile
index 252523d7847e..5b44139ff43d 100644
--- a/drivers/scsi/qla4xxx/Makefile
+++ b/drivers/scsi/qla4xxx/Makefile
@@ -1,5 +1,5 @@
 qla4xxx-y := ql4_os.o ql4_init.o ql4_mbx.o ql4_iocb.o ql4_isr.o \
-                ql4_nx.o ql4_nvram.o ql4_dbg.o ql4_attr.o
+                ql4_nx.o ql4_nvram.o ql4_dbg.o ql4_attr.o ql4_bsg.o
 
 obj-$(CONFIG_SCSI_QLA_ISCSI) += qla4xxx.o
 
diff --git a/drivers/scsi/qla4xxx/ql4_bsg.c b/drivers/scsi/qla4xxx/ql4_bsg.c
new file mode 100644
index 000000000000..daa2b0f8e309
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_bsg.c
@@ -0,0 +1,209 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c) 2011 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+
+#include "ql4_def.h"
+#include "ql4_glbl.h"
+#include "ql4_bsg.h"
+
+static int
+qla4xxx_read_flash(struct bsg_job *bsg_job)
+{
+        struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+        struct scsi_qla_host *ha = to_qla_host(host);
+        struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+        struct iscsi_bsg_request *bsg_req = bsg_job->request;
+        uint32_t sg_cnt;
+        uint32_t offset = 0;
+        uint32_t length = 0;
+        dma_addr_t flash_dma;
+        uint8_t *flash = NULL;
+        int rval = 0;
+
+        bsg_reply->reply_payload_rcv_len = 0;
+
+        if (unlikely(pci_channel_offline(ha->pdev)))
+                return -EINVAL;
+
+        if (ha->flash_state != QLFLASH_WAITING)
+                return -EBUSY;
+
+        /* TODO: Add check for adapter online, reset active?? */
+        sg_cnt = dma_map_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+                            bsg_job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+
+        if (!sg_cnt)
+                return -ENOMEM;
+
+        if (sg_cnt != bsg_job->reply_payload.sg_cnt) {
+                ql4_printk(KERN_ERR, ha, "dma mapping resulted in different"
+                           " sg counts, sg_cnt: %x dma_sg_cnt: %x\n",
+                           bsg_job->reply_payload.sg_cnt, sg_cnt);
+                rval = -EAGAIN;
+                goto unmap_sg;
+        }
+
+        offset = bsg_req->rqst_data.h_vendor.vendor_cmd[1];
+        length = bsg_job->reply_payload.payload_len;
+
+        flash = dma_alloc_coherent(&ha->pdev->dev, length, &flash_dma,
+                                   GFP_KERNEL);
+        if (!flash) {
+                ql4_printk(KERN_ERR, ha, "%s: dma alloc failed for flash "
+                           "data\n", __func__);
+                rval = -ENOMEM;
+                goto unmap_sg;
+        }
+
+        ha->flash_state = QLFLASH_READING;
+        if (qla4xxx_get_flash(ha, flash_dma, offset, length))
+                bsg_reply->result = (DID_ERROR << 16);
+        else {
+                sg_copy_from_buffer(bsg_job->reply_payload.sg_list,
+                                    bsg_job->reply_payload.sg_cnt,
+                                    flash, length);
+
+                bsg_reply->result = DID_OK;
+                bsg_reply->reply_payload_rcv_len = length;
+        }
+
+        if (flash)
+                dma_free_coherent(&ha->pdev->dev, length, flash, flash_dma);
+
+        ha->flash_state = QLFLASH_WAITING;
+unmap_sg:
+        dma_unmap_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+                     bsg_job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+        if (!rval)
+                bsg_job_done(bsg_job, bsg_reply->result,
+                             bsg_reply->reply_payload_rcv_len);
+        return rval;
+}
+
+static int
+qla4xxx_update_flash(struct bsg_job *bsg_job)
+{
+        struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+        struct scsi_qla_host *ha = to_qla_host(host);
+        struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+        struct iscsi_bsg_request *bsg_req = bsg_job->request;
+        uint32_t sg_cnt;
+        uint32_t length = 0;
+        uint32_t offset = 0;
+        uint32_t options = 0;
+        dma_addr_t flash_dma;
+        uint8_t *flash = NULL;
+        int rval = 0;
+
+        bsg_reply->reply_payload_rcv_len = 0;
+
+        if (unlikely(pci_channel_offline(ha->pdev)))
+                return -EINVAL;
+
+        if (ha->flash_state != QLFLASH_WAITING)
+                return -EBUSY;
+
+        sg_cnt = dma_map_sg(&ha->pdev->dev, bsg_job->request_payload.sg_list,
+                            bsg_job->request_payload.sg_cnt, DMA_TO_DEVICE);
+
+        if (!sg_cnt)
+                return -ENOMEM;
+
+        if (sg_cnt != bsg_job->request_payload.sg_cnt) {
+                ql4_printk(KERN_ERR, ha, "dma mapping resulted in different "
+                           "sg counts request_sg_cnt: %x dma_request_sg_cnt: "
+                           "%x\n", bsg_job->request_payload.sg_cnt, sg_cnt);
+                rval = -EAGAIN;
+                goto unmap_sg;
+        }
+
+        length = bsg_job->request_payload.payload_len;
+        offset = bsg_req->rqst_data.h_vendor.vendor_cmd[1];
+        options = bsg_req->rqst_data.h_vendor.vendor_cmd[2];
+
+        flash = dma_alloc_coherent(&ha->pdev->dev, length, &flash_dma,
+                                   GFP_KERNEL);
+        if (!flash) {
+                ql4_printk(KERN_ERR, ha, "%s: dma alloc failed for flash "
+                           "data\n", __func__);
+                rval = -ENOMEM;
+                goto unmap_sg;
+        }
+
+        ha->flash_state = QLFLASH_WRITING;
+        sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+                          bsg_job->request_payload.sg_cnt, flash, length);
+
+        if (qla4xxx_set_flash(ha, flash_dma, offset, length, options))
+                bsg_reply->result = (DID_ERROR << 16);
+        else {
+                bsg_reply->result = DID_OK;
+                bsg_reply->reply_payload_rcv_len = length;
+        }
+
+        if (flash)
+                dma_free_coherent(&ha->pdev->dev, length, flash, flash_dma);
+        ha->flash_state = QLFLASH_WAITING;
+unmap_sg:
+        dma_unmap_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+                     bsg_job->reply_payload.sg_cnt, DMA_TO_DEVICE);
+
+        if (!rval)
+                bsg_job_done(bsg_job, bsg_reply->result,
+                             bsg_reply->reply_payload_rcv_len);
+        return rval;
+}
+
+/**
+ * qla4xxx_process_vendor_specific - handle vendor specific bsg request
+ * @job: iscsi_bsg_job to handle
+ **/
+int qla4xxx_process_vendor_specific(struct bsg_job *bsg_job)
+{
+        struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+        struct iscsi_bsg_request *bsg_req = bsg_job->request;
+        struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+        struct scsi_qla_host *ha = to_qla_host(host);
+
+        switch (bsg_req->rqst_data.h_vendor.vendor_cmd[0]) {
+        case QLISCSI_VND_READ_FLASH:
+                return qla4xxx_read_flash(bsg_job);
+
+        case QLISCSI_VND_UPDATE_FLASH:
+                return qla4xxx_update_flash(bsg_job);
+
+        default:
+                ql4_printk(KERN_ERR, ha, "%s: invalid BSG vendor command: "
+                           "0x%x\n", __func__, bsg_req->msgcode);
+                bsg_reply->result = (DID_ERROR << 16);
+                bsg_reply->reply_payload_rcv_len = 0;
+                bsg_job_done(bsg_job, bsg_reply->result,
+                             bsg_reply->reply_payload_rcv_len);
+                return -ENOSYS;
+        }
+}
+
+/**
+ * qla4xxx_bsg_request - handle bsg request from ISCSI transport
+ * @job: iscsi_bsg_job to handle
+ */
+int qla4xxx_bsg_request(struct bsg_job *bsg_job)
+{
+        struct iscsi_bsg_request *bsg_req = bsg_job->request;
+        struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+        struct scsi_qla_host *ha = to_qla_host(host);
+
+        switch (bsg_req->msgcode) {
+        case ISCSI_BSG_HST_VENDOR:
+                return qla4xxx_process_vendor_specific(bsg_job);
+
+        default:
+                ql4_printk(KERN_ERR, ha, "%s: invalid BSG command: 0x%x\n",
+                           __func__, bsg_req->msgcode);
+        }
+
+        return -ENOSYS;
+}
diff --git a/drivers/scsi/qla4xxx/ql4_bsg.h b/drivers/scsi/qla4xxx/ql4_bsg.h
new file mode 100644
index 000000000000..5f6424ee6c1e
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_bsg.h
@@ -0,0 +1,14 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c) 2011 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+#ifndef __QL4_BSG_H
+#define __QL4_BSG_H
+
+/* BSG Vendor specific commands */
+#define QLISCSI_VND_READ_FLASH          1
+#define QLISCSI_VND_UPDATE_FLASH        2
+
+#endif
diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index 12db99280e04..b17f5c43bbe4 100644
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -25,6 +25,7 @@
 #include <linux/interrupt.h>
 #include <linux/mutex.h>
 #include <linux/aer.h>
+#include <linux/bsg-lib.h>
 
 #include <net/tcp.h>
 #include <scsi/scsi.h>
@@ -33,6 +34,8 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_iscsi.h>
+#include <scsi/scsi_bsg_iscsi.h>
+#include <scsi/scsi_netlink.h>
 
 #include "ql4_dbg.h"
 #include "ql4_nx.h"
@@ -599,6 +602,11 @@ struct scsi_qla_host {
         uint16_t bootload_minor;
         uint16_t bootload_patch;
         uint16_t bootload_build;
+
+        uint32_t flash_state;
+#define QLFLASH_WAITING         0
+#define QLFLASH_READING         1
+#define QLFLASH_WRITING         2
 };
 
 static inline int is_ipv4_enabled(struct scsi_qla_host *ha)
diff --git a/drivers/scsi/qla4xxx/ql4_glbl.h b/drivers/scsi/qla4xxx/ql4_glbl.h
index 786274c48313..77539ae00b83 100644
--- a/drivers/scsi/qla4xxx/ql4_glbl.h
+++ b/drivers/scsi/qla4xxx/ql4_glbl.h
@@ -151,6 +151,10 @@ void qla4_8xxx_need_qsnt_handler(struct scsi_qla_host *ha);
 void qla4_8xxx_clear_drv_active(struct scsi_qla_host *ha);
 void qla4_8xxx_set_drv_active(struct scsi_qla_host *ha);
 
+/* BSG Functions */
+int qla4xxx_bsg_request(struct bsg_job *bsg_job);
+int qla4xxx_process_vendor_specific(struct bsg_job *bsg_job);
+
 extern int ql4xextended_error_logging;
 extern int ql4xdontresethba;
 extern int ql4xenablemsix;
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index d5f9f60609b6..4e47bb1a85d1 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -131,6 +131,7 @@ static struct scsi_host_template qla4xxx_driver_template = {
 
         .max_sectors            = 0xFFFF,
         .shost_attrs            = qla4xxx_host_attrs,
+        .vendor_id              = SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_QLOGIC,
 };
 
 static struct iscsi_transport qla4xxx_iscsi_transport = {
@@ -146,6 +147,7 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
         .set_iface_param        = qla4xxx_iface_set_param,
         .session_recovery_timedout = qla4xxx_recovery_timedout,
         .get_iface_param        = qla4xxx_get_iface_param,
+        .bsg_request            = qla4xxx_bsg_request,
 };
 
 static struct scsi_transport_template *qla4xxx_scsi_transport;