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authorKaren Xie <kxie@chelsio.com>2008-12-09 14:15:32 -0800
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-30 10:45:33 -0600
commitc3673464ebc004a3d82063cd41b9cf74d1b55db2 (patch)
treeb061ecd04da7dd3ddddad8f39a4922f437493311 /drivers/scsi/cxgb3i/cxgb3i.h
parentb632ade282895562924d18b8eedd11a825f4b08c (diff)
[SCSI] cxgb3i: Add cxgb3i iSCSI driver.
This patch implements the cxgb3i iscsi connection acceleration for the open-iscsi initiator. The cxgb3i driver offers the iscsi PDU based offload: - digest insertion and verification - payload direct-placement into host memory buffer. Signed-off-by: Karen Xie <kxie@chelsio.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/cxgb3i/cxgb3i.h')
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i.h b/drivers/scsi/cxgb3i/cxgb3i.h
new file mode 100644
index 00000000000..fde6e4c634e
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i.h
@@ -0,0 +1,139 @@
+/*
+ * cxgb3i.h: Chelsio S3xx iSCSI driver.
+ *
+ * Copyright (c) 2008 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ */
+
+#ifndef __CXGB3I_H__
+#define __CXGB3I_H__
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/scatterlist.h>
+#include <scsi/libiscsi_tcp.h>
+
+/* from cxgb3 LLD */
+#include "common.h"
+#include "t3_cpl.h"
+#include "t3cdev.h"
+#include "cxgb3_ctl_defs.h"
+#include "cxgb3_offload.h"
+#include "firmware_exports.h"
+
+#include "cxgb3i_offload.h"
+#include "cxgb3i_ddp.h"
+
+#define CXGB3I_SCSI_QDEPTH_DFLT 128
+#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
+#define CXGB3I_MAX_LUN 512
+#define ISCSI_PDU_NONPAYLOAD_MAX \
+ (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
+
+struct cxgb3i_adapter;
+struct cxgb3i_hba;
+struct cxgb3i_endpoint;
+
+/**
+ * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
+ *
+ * @snic: cxgb3i adapter containing this port
+ * @ndev: pointer to netdev structure
+ * @shost: pointer to scsi host structure
+ */
+struct cxgb3i_hba {
+ struct cxgb3i_adapter *snic;
+ struct net_device *ndev;
+ struct Scsi_Host *shost;
+};
+
+/**
+ * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
+ *
+ * @listhead: list head to link elements
+ * @lock: lock for this structure
+ * @tdev: pointer to t3cdev used by cxgb3 driver
+ * @pdev: pointer to pci dev
+ * @hba_cnt: # of hbas (the same as # of ports)
+ * @hba: all the hbas on this adapter
+ * @tx_max_size: max. tx packet size supported
+ * @rx_max_size: max. rx packet size supported
+ * @tag_format: ddp tag format settings
+ */
+struct cxgb3i_adapter {
+ struct list_head list_head;
+ spinlock_t lock;
+ struct t3cdev *tdev;
+ struct pci_dev *pdev;
+ unsigned char hba_cnt;
+ struct cxgb3i_hba *hba[MAX_NPORTS];
+
+ unsigned int tx_max_size;
+ unsigned int rx_max_size;
+
+ struct cxgb3i_tag_format tag_format;
+};
+
+/**
+ * struct cxgb3i_conn - cxgb3i iscsi connection
+ *
+ * @listhead: list head to link elements
+ * @cep: pointer to iscsi_endpoint structure
+ * @conn: pointer to iscsi_conn structure
+ * @hba: pointer to the hba this conn. is going through
+ * @task_idx_bits: # of bits needed for session->cmds_max
+ */
+struct cxgb3i_conn {
+ struct list_head list_head;
+ struct cxgb3i_endpoint *cep;
+ struct iscsi_conn *conn;
+ struct cxgb3i_hba *hba;
+ unsigned int task_idx_bits;
+};
+
+/**
+ * struct cxgb3i_endpoint - iscsi tcp endpoint
+ *
+ * @c3cn: the h/w tcp connection representation
+ * @hba: pointer to the hba this conn. is going through
+ * @cconn: pointer to the associated cxgb3i iscsi connection
+ */
+struct cxgb3i_endpoint {
+ struct s3_conn *c3cn;
+ struct cxgb3i_hba *hba;
+ struct cxgb3i_conn *cconn;
+};
+
+int cxgb3i_iscsi_init(void);
+void cxgb3i_iscsi_cleanup(void);
+
+struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *);
+void cxgb3i_adapter_remove(struct t3cdev *);
+int cxgb3i_adapter_ulp_init(struct cxgb3i_adapter *);
+void cxgb3i_adapter_ulp_cleanup(struct cxgb3i_adapter *);
+
+struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *);
+struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
+ struct net_device *);
+void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
+
+int cxgb3i_pdu_init(void);
+void cxgb3i_pdu_cleanup(void);
+void cxgb3i_conn_cleanup_task(struct iscsi_task *);
+int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
+int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
+int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
+
+void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
+int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
+
+#endif