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linux/drivers/infiniband/hw/cxgb3/iwch_cm.h
Steve Wise f8b0dfd152 RDMA/cxgb3: Support peer-2-peer connection setup 
Open MPI, Intel MPI and other applications don't respect the iWARP
requirement that the client (active) side of the connection send the
first RDMA message.  This class of application connection setup is
called peer-to-peer.  Typically once the connection is setup, _both_
sides want to send data.

This patch enables supporting peer-to-peer over the chelsio RNIC by
enforcing this iWARP requirement in the driver itself as part of RDMA
connection setup.

Connection setup is extended, when the peer2peer module option is 1,
such that the MPA initiator will send a 0B Read (the RTR) just after
connection setup.  The MPA responder will suspend SQ processing until
the RTR message is received and reply-to.

In the longer term, this will be handled in a standardized way by
enhancing the MPA negotiation so peers can indicate whether they
want/need the RTR and what type of RTR (0B read, 0B write, or 0B send)
should be sent.  This will be done by standardizing a few bits of the
private data in order to negotiate all this.  However this patch
enables peer-to-peer applications now and allows most of the required
firmware and driver changes to be done and tested now.

Design:

 - Add a module option, peer2peer, to enable this mode.

 - New firmware support for peer-to-peer mode:

	- a new bit in the rdma_init WR to tell it to do peer-2-peer
	  and what form of RTR message to send or expect.

	- process _all_ preposted recvs before moving the connection
	  into rdma mode.

	- passive side: defer completing the rdma_init WR until all
	  pre-posted recvs are processed.  Suspend SQ processing until
	  the RTR is received.

	- active side: expect and process the 0B read WR on offload TX
	  queue. Defer completing the rdma_init WR until all
	  pre-posted recvs are processed.  Suspend SQ processing until
	  the 0B read WR is processed from the offload TX queue.

 - If peer2peer is set, driver posts 0B read request on offload TX
   queue just after posting the rdma_init WR to the offload TX queue.

 - Add CQ poll logic to ignore unsolicitied read responses.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2008-04-29 13:46:52 -07:00

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/*
* Copyright (c) 2006 Chelsio, 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 _IWCH_CM_H_
#define _IWCH_CM_H_
#include <linux/inet.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <rdma/ib_verbs.h>
#include <rdma/iw_cm.h>
#include "cxgb3_offload.h"
#include "iwch_provider.h"
#define MPA_KEY_REQ "MPA ID Req Frame"
#define MPA_KEY_REP "MPA ID Rep Frame"
#define MPA_MAX_PRIVATE_DATA 256
#define MPA_REV 0 /* XXX - amso1100 uses rev 0 ! */
#define MPA_REJECT 0x20
#define MPA_CRC 0x40
#define MPA_MARKERS 0x80
#define MPA_FLAGS_MASK 0xE0
#define put_ep(ep) { \
PDBG("put_ep (via %s:%u) ep %p refcnt %d\n", __func__, __LINE__, \
ep, atomic_read(&((ep)->kref.refcount))); \
WARN_ON(atomic_read(&((ep)->kref.refcount)) < 1); \
kref_put(&((ep)->kref), __free_ep); \
}
#define get_ep(ep) { \
PDBG("get_ep (via %s:%u) ep %p, refcnt %d\n", __func__, __LINE__, \
ep, atomic_read(&((ep)->kref.refcount))); \
kref_get(&((ep)->kref)); \
}
struct mpa_message {
u8 key[16];
u8 flags;
u8 revision;
__be16 private_data_size;
u8 private_data[0];
};
struct terminate_message {
u8 layer_etype;
u8 ecode;
__be16 hdrct_rsvd;
u8 len_hdrs[0];
};
#define TERM_MAX_LENGTH (sizeof(struct terminate_message) + 2 + 18 + 28)
enum iwch_layers_types {
LAYER_RDMAP = 0x00,
LAYER_DDP = 0x10,
LAYER_MPA = 0x20,
RDMAP_LOCAL_CATA = 0x00,
RDMAP_REMOTE_PROT = 0x01,
RDMAP_REMOTE_OP = 0x02,
DDP_LOCAL_CATA = 0x00,
DDP_TAGGED_ERR = 0x01,
DDP_UNTAGGED_ERR = 0x02,
DDP_LLP = 0x03
};
enum iwch_rdma_ecodes {
RDMAP_INV_STAG = 0x00,
RDMAP_BASE_BOUNDS = 0x01,
RDMAP_ACC_VIOL = 0x02,
RDMAP_STAG_NOT_ASSOC = 0x03,
RDMAP_TO_WRAP = 0x04,
RDMAP_INV_VERS = 0x05,
RDMAP_INV_OPCODE = 0x06,
RDMAP_STREAM_CATA = 0x07,
RDMAP_GLOBAL_CATA = 0x08,
RDMAP_CANT_INV_STAG = 0x09,
RDMAP_UNSPECIFIED = 0xff
};
enum iwch_ddp_ecodes {
DDPT_INV_STAG = 0x00,
DDPT_BASE_BOUNDS = 0x01,
DDPT_STAG_NOT_ASSOC = 0x02,
DDPT_TO_WRAP = 0x03,
DDPT_INV_VERS = 0x04,
DDPU_INV_QN = 0x01,
DDPU_INV_MSN_NOBUF = 0x02,
DDPU_INV_MSN_RANGE = 0x03,
DDPU_INV_MO = 0x04,
DDPU_MSG_TOOBIG = 0x05,
DDPU_INV_VERS = 0x06
};
enum iwch_mpa_ecodes {
MPA_CRC_ERR = 0x02,
MPA_MARKER_ERR = 0x03
};
enum iwch_ep_state {
IDLE = 0,
LISTEN,
CONNECTING,
MPA_REQ_WAIT,
MPA_REQ_SENT,
MPA_REQ_RCVD,
MPA_REP_SENT,
FPDU_MODE,
ABORTING,
CLOSING,
MORIBUND,
DEAD,
};
enum iwch_ep_flags {
PEER_ABORT_IN_PROGRESS = (1 << 0),
ABORT_REQ_IN_PROGRESS = (1 << 1),
};
struct iwch_ep_common {
struct iw_cm_id *cm_id;
struct iwch_qp *qp;
struct t3cdev *tdev;
enum iwch_ep_state state;
struct kref kref;
spinlock_t lock;
struct sockaddr_in local_addr;
struct sockaddr_in remote_addr;
wait_queue_head_t waitq;
int rpl_done;
int rpl_err;
};
struct iwch_listen_ep {
struct iwch_ep_common com;
unsigned int stid;
int backlog;
};
struct iwch_ep {
struct iwch_ep_common com;
struct iwch_ep *parent_ep;
struct timer_list timer;
unsigned int atid;
u32 hwtid;
u32 snd_seq;
u32 rcv_seq;
struct l2t_entry *l2t;
struct dst_entry *dst;
struct sk_buff *mpa_skb;
struct iwch_mpa_attributes mpa_attr;
unsigned int mpa_pkt_len;
u8 mpa_pkt[sizeof(struct mpa_message) + MPA_MAX_PRIVATE_DATA];
u8 tos;
u16 emss;
u16 plen;
u32 ird;
u32 ord;
u32 flags;
};
static inline struct iwch_ep *to_ep(struct iw_cm_id *cm_id)
{
return cm_id->provider_data;
}
static inline struct iwch_listen_ep *to_listen_ep(struct iw_cm_id *cm_id)
{
return cm_id->provider_data;
}
static inline int compute_wscale(int win)
{
int wscale = 0;
while (wscale < 14 && (65535<<wscale) < win)
wscale++;
return wscale;
}
/* CM prototypes */
int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
int iwch_create_listen(struct iw_cm_id *cm_id, int backlog);
int iwch_destroy_listen(struct iw_cm_id *cm_id);
int iwch_reject_cr(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len);
int iwch_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
int iwch_ep_disconnect(struct iwch_ep *ep, int abrupt, gfp_t gfp);
int iwch_quiesce_tid(struct iwch_ep *ep);
int iwch_resume_tid(struct iwch_ep *ep);
void __free_ep(struct kref *kref);
void iwch_rearp(struct iwch_ep *ep);
int iwch_ep_redirect(void *ctx, struct dst_entry *old, struct dst_entry *new, struct l2t_entry *l2t);
int __init iwch_cm_init(void);
void __exit iwch_cm_term(void);
extern int peer2peer;
#endif /* _IWCH_CM_H_ */
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