[SCSI] qla2xxx: Implementation of bidirectional.

[jejb: merge fix for introduced warning]
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_bsg.c b/drivers/scsi/qla2xxx/qla_bsg.c
index 462ac707b8d6..dac3427ebf24 100644
--- a/drivers/scsi/qla2xxx/qla_bsg.c
+++ b/drivers/scsi/qla2xxx/qla_bsg.c
@@ -1650,6 +1650,186 @@ done:
 }
 
 static int
+qla24xx_process_bidir_cmd(struct fc_bsg_job *bsg_job)
+{
+	struct Scsi_Host *host = bsg_job->shost;
+	scsi_qla_host_t *vha = shost_priv(host);
+	struct qla_hw_data *ha = vha->hw;
+	uint16_t thread_id;
+	uint32_t rval = EXT_STATUS_OK;
+	uint16_t req_sg_cnt = 0;
+	uint16_t rsp_sg_cnt = 0;
+	uint16_t nextlid = 0;
+	uint32_t tot_dsds;
+	srb_t *sp = NULL;
+	uint32_t req_data_len = 0;
+	uint32_t rsp_data_len = 0;
+
+	/* Check the type of the adapter */
+	if (!IS_BIDI_CAPABLE(ha)) {
+		ql_log(ql_log_warn, vha, 0x70a0,
+			"This adapter is not supported\n");
+		rval = EXT_STATUS_NOT_SUPPORTED;
+		goto done;
+	}
+
+	if (test_bit(ISP_ABORT_NEEDED, &vha->dpc_flags) ||
+		test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags) ||
+		test_bit(ISP_ABORT_RETRY, &vha->dpc_flags)) {
+		rval =  EXT_STATUS_BUSY;
+		goto done;
+	}
+
+	/* Check if host is online */
+	if (!vha->flags.online) {
+		ql_log(ql_log_warn, vha, 0x70a1,
+			"Host is not online\n");
+		rval = EXT_STATUS_DEVICE_OFFLINE;
+		goto done;
+	}
+
+	/* Check if cable is plugged in or not */
+	if (vha->device_flags & DFLG_NO_CABLE) {
+		ql_log(ql_log_warn, vha, 0x70a2,
+			"Cable is unplugged...\n");
+		rval = EXT_STATUS_INVALID_CFG;
+		goto done;
+	}
+
+	/* Check if the switch is connected or not */
+	if (ha->current_topology != ISP_CFG_F) {
+		ql_log(ql_log_warn, vha, 0x70a3,
+			"Host is not connected to the switch\n");
+		rval = EXT_STATUS_INVALID_CFG;
+		goto done;
+	}
+
+	/* Check if operating mode is P2P */
+	if (ha->operating_mode != P2P) {
+		ql_log(ql_log_warn, vha, 0x70a4,
+		    "Host is operating mode is not P2p\n");
+		rval = EXT_STATUS_INVALID_CFG;
+		goto done;
+	}
+
+	thread_id = bsg_job->request->rqst_data.h_vendor.vendor_cmd[1];
+
+	mutex_lock(&ha->selflogin_lock);
+	if (vha->self_login_loop_id == 0) {
+		/* Initialize all required  fields of fcport */
+		vha->bidir_fcport.vha = vha;
+		vha->bidir_fcport.d_id.b.al_pa = vha->d_id.b.al_pa;
+		vha->bidir_fcport.d_id.b.area = vha->d_id.b.area;
+		vha->bidir_fcport.d_id.b.domain = vha->d_id.b.domain;
+		vha->bidir_fcport.loop_id = vha->loop_id;
+
+		if (qla2x00_fabric_login(vha, &(vha->bidir_fcport), &nextlid)) {
+			ql_log(ql_log_warn, vha, 0x70a7,
+			    "Failed to login port %06X for bidirectional IOCB\n",
+			    vha->bidir_fcport.d_id.b24);
+			mutex_unlock(&ha->selflogin_lock);
+			rval = EXT_STATUS_MAILBOX;
+			goto done;
+		}
+		vha->self_login_loop_id = nextlid - 1;
+
+	}
+	/* Assign the self login loop id to fcport */
+	mutex_unlock(&ha->selflogin_lock);
+
+	vha->bidir_fcport.loop_id = vha->self_login_loop_id;
+
+	req_sg_cnt = dma_map_sg(&ha->pdev->dev,
+		bsg_job->request_payload.sg_list,
+		bsg_job->request_payload.sg_cnt,
+		DMA_TO_DEVICE);
+
+	if (!req_sg_cnt) {
+		rval = EXT_STATUS_NO_MEMORY;
+		goto done;
+	}
+
+	rsp_sg_cnt = dma_map_sg(&ha->pdev->dev,
+		bsg_job->reply_payload.sg_list, bsg_job->reply_payload.sg_cnt,
+		DMA_FROM_DEVICE);
+
+	if (!rsp_sg_cnt) {
+		rval = EXT_STATUS_NO_MEMORY;
+		goto done_unmap_req_sg;
+	}
+
+	if ((req_sg_cnt !=  bsg_job->request_payload.sg_cnt) ||
+		(rsp_sg_cnt != bsg_job->reply_payload.sg_cnt)) {
+		ql_dbg(ql_dbg_user, vha, 0x70a9,
+		    "Dma mapping resulted in different sg counts "
+		    "[request_sg_cnt: %x dma_request_sg_cnt: %x reply_sg_cnt: "
+		    "%x dma_reply_sg_cnt: %x]\n",
+		    bsg_job->request_payload.sg_cnt, req_sg_cnt,
+		    bsg_job->reply_payload.sg_cnt, rsp_sg_cnt);
+		rval = EXT_STATUS_NO_MEMORY;
+		goto done_unmap_sg;
+	}
+
+	if (req_data_len != rsp_data_len) {
+		rval = EXT_STATUS_BUSY;
+		ql_log(ql_log_warn, vha, 0x70aa,
+		    "req_data_len != rsp_data_len\n");
+		goto done_unmap_sg;
+	}
+
+	req_data_len = bsg_job->request_payload.payload_len;
+	rsp_data_len = bsg_job->reply_payload.payload_len;
+
+
+	/* Alloc SRB structure */
+	sp = qla2x00_get_sp(vha, &(vha->bidir_fcport), GFP_KERNEL);
+	if (!sp) {
+		ql_dbg(ql_dbg_user, vha, 0x70ac,
+		    "Alloc SRB structure failed\n");
+		rval = EXT_STATUS_NO_MEMORY;
+		goto done_unmap_sg;
+	}
+
+	/*Populate srb->ctx with bidir ctx*/
+	sp->u.bsg_job = bsg_job;
+	sp->free = qla2x00_bsg_sp_free;
+	sp->type = SRB_BIDI_CMD;
+	sp->done = qla2x00_bsg_job_done;
+
+	/* Add the read and write sg count */
+	tot_dsds = rsp_sg_cnt + req_sg_cnt;
+
+	rval = qla2x00_start_bidir(sp, vha, tot_dsds);
+	if (rval != EXT_STATUS_OK)
+		goto done_free_srb;
+	/* the bsg request  will be completed in the interrupt handler */
+	return rval;
+
+done_free_srb:
+	mempool_free(sp, ha->srb_mempool);
+done_unmap_sg:
+	dma_unmap_sg(&ha->pdev->dev,
+	    bsg_job->reply_payload.sg_list,
+	    bsg_job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+done_unmap_req_sg:
+	dma_unmap_sg(&ha->pdev->dev,
+	    bsg_job->request_payload.sg_list,
+	    bsg_job->request_payload.sg_cnt, DMA_TO_DEVICE);
+done:
+
+	/* Return an error vendor specific response
+	 * and complete the bsg request
+	 */
+	bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] = rval;
+	bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+	bsg_job->reply->reply_payload_rcv_len = 0;
+	bsg_job->reply->result = (DID_OK) << 16;
+	bsg_job->job_done(bsg_job);
+	/* Always retrun success, vendor rsp carries correct status */
+	return 0;
+}
+
+static int
 qla2x00_process_vendor_specific(struct fc_bsg_job *bsg_job)
 {
 	switch (bsg_job->request->rqst_data.h_vendor.vendor_cmd[0]) {
@@ -1692,6 +1872,9 @@ qla2x00_process_vendor_specific(struct fc_bsg_job *bsg_job)
 	case QL_VND_READ_I2C:
 		return qla2x00_read_i2c(bsg_job);
 
+	case QL_VND_DIAG_IO_CMD:
+		return qla24xx_process_bidir_cmd(bsg_job);
+
 	default:
 		bsg_job->reply->result = (DID_ERROR << 16);
 		bsg_job->job_done(bsg_job);