Add support for the latest 1G/10G Chelsio adapter, T3.

This driver is required by the Chelsio T3 RDMA driver posted by
Steve Wise.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 193 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/cxgb3_offload.h b/drivers/net/cxgb3/cxgb3_offload.h
new file mode 100644
index 000000000000..7b7798384ae8
--- /dev/null
+++ b/drivers/net/cxgb3/cxgb3_offload.h
@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2006 Open Grid Computing, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef _CXGB3_OFFLOAD_H
+#define _CXGB3_OFFLOAD_H
+
+#include <linux/list.h>
+#include <linux/skbuff.h>
+
+#include "l2t.h"
+
+#include "t3cdev.h"
+#include "t3_cpl.h"
+
+struct adapter;
+
+void cxgb3_offload_init(void);
+
+void cxgb3_adapter_ofld(struct adapter *adapter);
+void cxgb3_adapter_unofld(struct adapter *adapter);
+int cxgb3_offload_activate(struct adapter *adapter);
+void cxgb3_offload_deactivate(struct adapter *adapter);
+
+void cxgb3_set_dummy_ops(struct t3cdev *dev);
+
+/*
+ * Client registration.  Users of T3 driver must register themselves.
+ * The T3 driver will call the add function of every client for each T3
+ * adapter activated, passing up the t3cdev ptr.  Each client fills out an
+ * array of callback functions to process CPL messages.
+ */
+
+void cxgb3_register_client(struct cxgb3_client *client);
+void cxgb3_unregister_client(struct cxgb3_client *client);
+void cxgb3_add_clients(struct t3cdev *tdev);
+void cxgb3_remove_clients(struct t3cdev *tdev);
+
+typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
+                                      struct sk_buff *skb, void *ctx);
+
+struct cxgb3_client {
+        char *name;
+        void (*add) (struct t3cdev *);
+        void (*remove) (struct t3cdev *);
+        cxgb3_cpl_handler_func *handlers;
+        int (*redirect)(void *ctx, struct dst_entry *old,
+                        struct dst_entry *new, struct l2t_entry *l2t);
+        struct list_head client_list;
+};
+
+/*
+ * TID allocation services.
+ */
+int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
+                     void *ctx);
+int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client,
+                     void *ctx);
+void *cxgb3_free_atid(struct t3cdev *dev, int atid);
+void cxgb3_free_stid(struct t3cdev *dev, int stid);
+void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
+                      void *ctx, unsigned int tid);
+void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
+void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
+
+struct t3c_tid_entry {
+        struct cxgb3_client *client;
+        void *ctx;
+};
+
+/* CPL message priority levels */
+enum {
+        CPL_PRIORITY_DATA = 0,  /* data messages */
+        CPL_PRIORITY_SETUP = 1, /* connection setup messages */
+        CPL_PRIORITY_TEARDOWN = 0,      /* connection teardown messages */
+        CPL_PRIORITY_LISTEN = 1,        /* listen start/stop messages */
+        CPL_PRIORITY_ACK = 1,   /* RX ACK messages */
+        CPL_PRIORITY_CONTROL = 1        /* offload control messages */
+};
+
+/* Flags for return value of CPL message handlers */
+enum {
+        CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
+        CPL_RET_BAD_MSG = 2,  /* bad CPL message (e.g., unknown opcode) */
+        CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
+};
+
+typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
+
+/*
+ * Returns a pointer to the first byte of the CPL header in an sk_buff that
+ * contains a CPL message.
+ */
+static inline void *cplhdr(struct sk_buff *skb)
+{
+        return skb->data;
+}
+
+void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
+
+union listen_entry {
+        struct t3c_tid_entry t3c_tid;
+        union listen_entry *next;
+};
+
+union active_open_entry {
+        struct t3c_tid_entry t3c_tid;
+        union active_open_entry *next;
+};
+
+/*
+ * Holds the size, base address, free list start, etc of the TID, server TID,
+ * and active-open TID tables for a offload device.
+ * The tables themselves are allocated dynamically.
+ */
+struct tid_info {
+        struct t3c_tid_entry *tid_tab;
+        unsigned int ntids;
+        atomic_t tids_in_use;
+
+        union listen_entry *stid_tab;
+        unsigned int nstids;
+        unsigned int stid_base;
+
+        union active_open_entry *atid_tab;
+        unsigned int natids;
+        unsigned int atid_base;
+
+        /*
+         * The following members are accessed R/W so we put them in their own
+         * cache lines.
+         *
+         * XXX We could combine the atid fields above with the lock here since
+         * atids are use once (unlike other tids).  OTOH the above fields are
+         * usually in cache due to tid_tab.
+         */
+        spinlock_t atid_lock ____cacheline_aligned_in_smp;
+        union active_open_entry *afree;
+        unsigned int atids_in_use;
+
+        spinlock_t stid_lock ____cacheline_aligned;
+        union listen_entry *sfree;
+        unsigned int stids_in_use;
+};
+
+struct t3c_data {
+        struct list_head list_node;
+        struct t3cdev *dev;
+        unsigned int tx_max_chunk;      /* max payload for TX_DATA */
+        unsigned int max_wrs;   /* max in-flight WRs per connection */
+        unsigned int nmtus;
+        const unsigned short *mtus;
+        struct tid_info tid_maps;
+
+        struct t3c_tid_entry *tid_release_list;
+        spinlock_t tid_release_lock;
+        struct work_struct tid_release_task;
+};
+
+/*
+ * t3cdev -> t3c_data accessor
+ */
+#define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
+
+#endif