IB/ipath: Remove ipath_layer dead code

The ipath_layer.[ch] code was an attempt to provide a single interface
for the ipath verbs and ipath_ether code to use. As verbs
functionality increased, the layer's functionality became insufficient
and the verbs code broke away to interface directly to the driver.
The failed attempt to get ipath_ether upstream was the final nail in
the coffin and now it sits quietly in a dark kernel.org corner waiting
for someone to notice the smell and send it along to it's final
resting place. Roland Dreier was that someone -- this patch expands
on his work...

Signed-off-by: Arthur Jones <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/hw/ipath/Makefile

···
 	ipath_init_chip.o \
 	ipath_intr.o \
 	ipath_keys.o \
-	ipath_layer.o \
 	ipath_mad.o \
 	ipath_mmap.o \
 	ipath_mr.o \

drivers/infiniband/hw/ipath/ipath_layer.c

···
-/*
- * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
- * Copyright (c) 2003, 2004, 2005, 2006 PathScale, 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.
- */
-
-/*
- * These are the routines used by layered drivers, currently just the
- * layered ethernet driver and verbs layer.
- */
-
-#include <linux/io.h>
-#include <asm/byteorder.h>
-
-#include "ipath_kernel.h"
-#include "ipath_layer.h"
-#include "ipath_verbs.h"
-#include "ipath_common.h"
-
-/* Acquire before ipath_devs_lock. */
-static DEFINE_MUTEX(ipath_layer_mutex);
-
-u16 ipath_layer_rcv_opcode;
-
-static int (*layer_intr)(void *, u32);
-static int (*layer_rcv)(void *, void *, struct sk_buff *);
-static int (*layer_rcv_lid)(void *, void *);
-
-static void *(*layer_add_one)(int, struct ipath_devdata *);
-static void (*layer_remove_one)(void *);
-
-int __ipath_layer_intr(struct ipath_devdata *dd, u32 arg)
-{
-	int ret = -ENODEV;
-
-	if (dd->ipath_layer.l_arg && layer_intr)
-		ret = layer_intr(dd->ipath_layer.l_arg, arg);
-
-	return ret;
-}
-
-int ipath_layer_intr(struct ipath_devdata *dd, u32 arg)
-{
-	int ret;
-
-	mutex_lock(&ipath_layer_mutex);
-
-	ret = __ipath_layer_intr(dd, arg);
-
-	mutex_unlock(&ipath_layer_mutex);
-
-	return ret;
-}
-
-int __ipath_layer_rcv(struct ipath_devdata *dd, void *hdr,
-		      struct sk_buff *skb)
-{
-	int ret = -ENODEV;
-
-	if (dd->ipath_layer.l_arg && layer_rcv)
-		ret = layer_rcv(dd->ipath_layer.l_arg, hdr, skb);
-
-	return ret;
-}
-
-int __ipath_layer_rcv_lid(struct ipath_devdata *dd, void *hdr)
-{
-	int ret = -ENODEV;
-
-	if (dd->ipath_layer.l_arg && layer_rcv_lid)
-		ret = layer_rcv_lid(dd->ipath_layer.l_arg, hdr);
-
-	return ret;
-}
-
-void ipath_layer_lid_changed(struct ipath_devdata *dd)
-{
-	mutex_lock(&ipath_layer_mutex);
-
-	if (dd->ipath_layer.l_arg && layer_intr)
-		layer_intr(dd->ipath_layer.l_arg, IPATH_LAYER_INT_LID);
-
-	mutex_unlock(&ipath_layer_mutex);
-}
-
-void ipath_layer_add(struct ipath_devdata *dd)
-{
-	mutex_lock(&ipath_layer_mutex);
-
-	if (layer_add_one)
-		dd->ipath_layer.l_arg =
-			layer_add_one(dd->ipath_unit, dd);
-
-	mutex_unlock(&ipath_layer_mutex);
-}
-
-void ipath_layer_remove(struct ipath_devdata *dd)
-{
-	mutex_lock(&ipath_layer_mutex);
-
-	if (dd->ipath_layer.l_arg && layer_remove_one) {
-		layer_remove_one(dd->ipath_layer.l_arg);
-		dd->ipath_layer.l_arg = NULL;
-	}
-
-	mutex_unlock(&ipath_layer_mutex);
-}
-
-int ipath_layer_register(void *(*l_add)(int, struct ipath_devdata *),
-			 void (*l_remove)(void *),
-			 int (*l_intr)(void *, u32),
-			 int (*l_rcv)(void *, void *, struct sk_buff *),
-			 u16 l_rcv_opcode,
-			 int (*l_rcv_lid)(void *, void *))
-{
-	struct ipath_devdata *dd, *tmp;
-	unsigned long flags;
-
-	mutex_lock(&ipath_layer_mutex);
-
-	layer_add_one = l_add;
-	layer_remove_one = l_remove;
-	layer_intr = l_intr;
-	layer_rcv = l_rcv;
-	layer_rcv_lid = l_rcv_lid;
-	ipath_layer_rcv_opcode = l_rcv_opcode;
-
-	spin_lock_irqsave(&ipath_devs_lock, flags);
-
-	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
-		if (!(dd->ipath_flags & IPATH_INITTED))
-			continue;
-
-		if (dd->ipath_layer.l_arg)
-			continue;
-
-		spin_unlock_irqrestore(&ipath_devs_lock, flags);
-		dd->ipath_layer.l_arg = l_add(dd->ipath_unit, dd);
-		spin_lock_irqsave(&ipath_devs_lock, flags);
-	}
-
-	spin_unlock_irqrestore(&ipath_devs_lock, flags);
-	mutex_unlock(&ipath_layer_mutex);
-
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_register);
-
-void ipath_layer_unregister(void)
-{
-	struct ipath_devdata *dd, *tmp;
-	unsigned long flags;
-
-	mutex_lock(&ipath_layer_mutex);
-	spin_lock_irqsave(&ipath_devs_lock, flags);
-
-	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
-		if (dd->ipath_layer.l_arg && layer_remove_one) {
-			spin_unlock_irqrestore(&ipath_devs_lock, flags);
-			layer_remove_one(dd->ipath_layer.l_arg);
-			spin_lock_irqsave(&ipath_devs_lock, flags);
-			dd->ipath_layer.l_arg = NULL;
-		}
-	}
-
-	spin_unlock_irqrestore(&ipath_devs_lock, flags);
-
-	layer_add_one = NULL;
-	layer_remove_one = NULL;
-	layer_intr = NULL;
-	layer_rcv = NULL;
-	layer_rcv_lid = NULL;
-
-	mutex_unlock(&ipath_layer_mutex);
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_unregister);
-
-int ipath_layer_open(struct ipath_devdata *dd, u32 * pktmax)
-{
-	int ret;
-	u32 intval = 0;
-
-	mutex_lock(&ipath_layer_mutex);
-
-	if (!dd->ipath_layer.l_arg) {
-		ret = -EINVAL;
-		goto bail;
-	}
-
-	ret = ipath_setrcvhdrsize(dd, IPATH_HEADER_QUEUE_WORDS);
-
-	if (ret < 0)
-		goto bail;
-
-	*pktmax = dd->ipath_ibmaxlen;
-
-	if (*dd->ipath_statusp & IPATH_STATUS_IB_READY)
-		intval |= IPATH_LAYER_INT_IF_UP;
-	if (dd->ipath_lid)
-		intval |= IPATH_LAYER_INT_LID;
-	if (dd->ipath_mlid)
-		intval |= IPATH_LAYER_INT_BCAST;
-	/*
-	 * do this on open, in case low level is already up and
-	 * just layered driver was reloaded, etc.
-	 */
-	if (intval)
-		layer_intr(dd->ipath_layer.l_arg, intval);
-
-	ret = 0;
-bail:
-	mutex_unlock(&ipath_layer_mutex);
-
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_open);
-
-u16 ipath_layer_get_lid(struct ipath_devdata *dd)
-{
-	return dd->ipath_lid;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_get_lid);
-
-/**
- * ipath_layer_get_mac - get the MAC address
- * @dd: the infinipath device
- * @mac: the MAC is put here
- *
- * This is the EUID-64 OUI octets (top 3), then
- * skip the next 2 (which should both be zero or 0xff).
- * The returned MAC is in network order
- * mac points to at least 6 bytes of buffer
- * We assume that by the time the LID is set, that the GUID is as valid
- * as it's ever going to be, rather than adding yet another status bit.
- */
-
-int ipath_layer_get_mac(struct ipath_devdata *dd, u8 * mac)
-{
-	u8 *guid;
-
-	guid = (u8 *) &dd->ipath_guid;
-
-	mac[0] = guid[0];
-	mac[1] = guid[1];
-	mac[2] = guid[2];
-	mac[3] = guid[5];
-	mac[4] = guid[6];
-	mac[5] = guid[7];
-	if ((guid[3] || guid[4]) && !(guid[3] == 0xff && guid[4] == 0xff))
-		ipath_dbg("Warning, guid bytes 3 and 4 not 0 or 0xffff: "
-			  "%x %x\n", guid[3], guid[4]);
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_get_mac);
-
-u16 ipath_layer_get_bcast(struct ipath_devdata *dd)
-{
-	return dd->ipath_mlid;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_get_bcast);
-
-int ipath_layer_send_hdr(struct ipath_devdata *dd, struct ether_header *hdr)
-{
-	int ret = 0;
-	u32 __iomem *piobuf;
-	u32 plen, *uhdr;
-	size_t count;
-	__be16 vlsllnh;
-
-	if (!(dd->ipath_flags & IPATH_RCVHDRSZ_SET)) {
-		ipath_dbg("send while not open\n");
-		ret = -EINVAL;
-	} else
-		if ((dd->ipath_flags & (IPATH_LINKUNK | IPATH_LINKDOWN)) ||
-		    dd->ipath_lid == 0) {
-			/*
-			 * lid check is for when sma hasn't yet configured
-			 */
-			ret = -ENETDOWN;
-			ipath_cdbg(VERBOSE, "send while not ready, "
-				   "mylid=%u, flags=0x%x\n",
-				   dd->ipath_lid, dd->ipath_flags);
-		}
-
-	vlsllnh = *((__be16 *) hdr);
-	if (vlsllnh != htons(IPATH_LRH_BTH)) {
-		ipath_dbg("Warning: lrh[0] wrong (%x, not %x); "
-			  "not sending\n", be16_to_cpu(vlsllnh),
-			  IPATH_LRH_BTH);
-		ret = -EINVAL;
-	}
-	if (ret)
-		goto done;
-
-	/* Get a PIO buffer to use. */
-	piobuf = ipath_getpiobuf(dd, NULL);
-	if (piobuf == NULL) {
-		ret = -EBUSY;
-		goto done;
-	}
-
-	plen = (sizeof(*hdr) >> 2); /* actual length */
-	ipath_cdbg(EPKT, "0x%x+1w pio %p\n", plen, piobuf);
-
-	writeq(plen+1, piobuf); /* len (+1 for pad) to pbc, no flags */
-	ipath_flush_wc();
-	piobuf += 2;
-	uhdr = (u32 *)hdr;
-	count = plen-1; /* amount we can copy before trigger word */
-	__iowrite32_copy(piobuf, uhdr, count);
-	ipath_flush_wc();
-	__raw_writel(uhdr[count], piobuf + count);
-	ipath_flush_wc(); /* ensure it's sent, now */
-
-	ipath_stats.sps_ether_spkts++;	/* ether packet sent */
-
-done:
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_send_hdr);
-
-int ipath_layer_set_piointbufavail_int(struct ipath_devdata *dd)
-{
-	set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
-
-	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
-			 dd->ipath_sendctrl);
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(ipath_layer_set_piointbufavail_int);

drivers/infiniband/hw/ipath/ipath_layer.h

···
-/*
- * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
- * Copyright (c) 2003, 2004, 2005, 2006 PathScale, 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 _IPATH_LAYER_H
-#define _IPATH_LAYER_H
-
-/*
- * This header file is for symbols shared between the infinipath driver
- * and drivers layered upon it (such as ipath).
- */
-
-struct sk_buff;
-struct ipath_devdata;
-struct ether_header;
-
-int ipath_layer_register(void *(*l_add)(int, struct ipath_devdata *),
-			 void (*l_remove)(void *),
-			 int (*l_intr)(void *, u32),
-			 int (*l_rcv)(void *, void *,
-				      struct sk_buff *),
-			 u16 rcv_opcode,
-			 int (*l_rcv_lid)(void *, void *));
-void ipath_layer_unregister(void);
-int ipath_layer_open(struct ipath_devdata *, u32 * pktmax);
-u16 ipath_layer_get_lid(struct ipath_devdata *dd);
-int ipath_layer_get_mac(struct ipath_devdata *dd, u8 *);
-u16 ipath_layer_get_bcast(struct ipath_devdata *dd);
-int ipath_layer_send_hdr(struct ipath_devdata *dd,
-			 struct ether_header *hdr);
-int ipath_layer_set_piointbufavail_int(struct ipath_devdata *dd);
-
-/* ipath_ether interrupt values */
-#define IPATH_LAYER_INT_IF_UP 0x2
-#define IPATH_LAYER_INT_IF_DOWN 0x4
-#define IPATH_LAYER_INT_LID 0x8
-#define IPATH_LAYER_INT_SEND_CONTINUE 0x10
-#define IPATH_LAYER_INT_BCAST 0x40
-
-extern unsigned ipath_debug; /* debugging bit mask */
-
-#endif				/* _IPATH_LAYER_H */

drivers/infiniband/hw/ipath/ipath_verbs.h

···
 #include <rdma/ib_pack.h>
 #include <rdma/ib_user_verbs.h>
 
-#include "ipath_layer.h"
-
 #define IPATH_MAX_RDMA_ATOMIC	4
 
 #define QPN_MAX                 (1 << 24)