Message-Id: <1308228122-22616-1-git-send-email-bmt@zurich.ibm.com>
Date:	Thu, 16 Jun 2011 14:42:02 +0200
From:	Bernard Metzler <bmt@...ich.ibm.com>
To:	netdev@...r.kernel.org
Cc:	linux-rdma@...r.kernel.org, Bernard Metzler <bmt@...ich.ibm.com>
Subject: [PATCH 04/14] SIWv2: Module initialization: siw_main.c

---
 drivers/infiniband/hw/siw/siw_main.c |  603 ++++++++++++++++++++++++++++++++++
 1 files changed, 603 insertions(+), 0 deletions(-)
 create mode 100644 drivers/infiniband/hw/siw/siw_main.c

diff --git a/drivers/infiniband/hw/siw/siw_main.c b/drivers/infiniband/hw/siw/siw_main.c
new file mode 100644
index 0000000..b2b7bea
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_main.c
@@ -0,0 +1,603 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2011, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <net/net_namespace.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_arp.h>
+#include <linux/list.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_user_verbs.h>
+
+#include "siw.h"
+#include "siw_obj.h"
+#include "siw_cm.h"
+#include "siw_verbs.h"
+
+
+MODULE_DESCRIPTION("Software iWARP Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION("0.1");
+
+#define SIW_MAX_IF 12
+static char *iface_list[SIW_MAX_IF];
+module_param_array(iface_list, charp, NULL, 0444);
+MODULE_PARM_DESC(iface_list, "Interface list siw attaches to if present");
+
+static bool loopback_enabled;
+module_param(loopback_enabled, bool, 0644);
+MODULE_PARM_DESC(loopback_enabled, "enable_loopback");
+
+atomic_t siw_num_wqe;
+atomic_t siw_num_cep;
+
+static LIST_HEAD(siw_devlist);
+
+
+static ssize_t show_sw_version(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct siw_dev *siw_dev = container_of(dev, struct siw_dev,
+						 ofa_dev.dev);
+
+	return sprintf(buf, "%x\n", siw_dev->attrs.version);
+}
+
+static ssize_t show_stats(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct siw_dev *siw_dev = container_of(dev, struct siw_dev,
+					       ofa_dev.dev);
+
+	return sprintf(buf, "Allocated SIW Objects:\n"
+#if DPRINT_MASK > 0
+			"Global     :\t%s: %d\n"
+#endif
+			"Device %s:\t"
+			"%s: %d, %s: %d, %s: %d, %s: %d, %s: %d, %s: %d\n",
+#if DPRINT_MASK > 0
+			"WQEs", atomic_read(&siw_num_wqe),
+#endif
+			siw_dev->ofa_dev.name,
+			"PDs", atomic_read(&siw_dev->num_pd),
+			"QPs", atomic_read(&siw_dev->num_qp),
+			"CQs", atomic_read(&siw_dev->num_cq),
+			"SRQs", atomic_read(&siw_dev->num_srq),
+			"MRs", atomic_read(&siw_dev->num_mem),
+			"CEPs", atomic_read(&siw_dev->num_cep));
+}
+
+static ssize_t show_ceps(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct siw_dev *siw_dev = container_of(dev, struct siw_dev,
+					       ofa_dev.dev);
+
+	struct list_head *pos, *tmp;
+	int len, num_cep = atomic_read(&siw_dev->num_cep);
+
+	if (buf)
+		len = sprintf(buf, "%s: %d CEPs %s\n", siw_dev->ofa_dev.name,
+			      num_cep,
+			      num_cep ? "- see dmesg for details" : "");
+	else
+		len = 0;
+
+	if (num_cep)
+		printk(KERN_INFO "\n%d CEPs on device %s:\n",
+			num_cep, siw_dev->ofa_dev.name);
+	else
+		return len;
+
+	printk(KERN_INFO "%-20s%-6s%-6s%-7s%-3s%-3s%-4s%-21s%-9s\n",
+		"CEP", "State", "Ref's", "QP-ID", "LQ", "LC", "U", "Sock",
+		"CM-ID");
+
+	list_for_each_safe(pos, tmp, &siw_dev->cep_list) {
+		struct siw_cep *cep = list_entry(pos, struct siw_cep, devq);
+
+		printk(KERN_INFO "0x%-18p%-6d%-6d%-7d%-3s%-3s%-4d0x%-18p"
+			" 0x%-16p\n",
+			cep, cep->state,
+			atomic_read(&cep->ref.refcount),
+			cep->qp ? QP_ID(cep->qp) : -1,
+			list_empty(&cep->listenq) ? "n" : "y",
+			cep->listen_cep ? "y" : "n",
+			cep->in_use,
+			cep->llp.sock,
+			cep->cm_id);
+	}
+	return len;
+}
+
+static ssize_t show_qps(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct siw_dev *siw_dev = container_of(dev, struct siw_dev,
+					       ofa_dev.dev);
+
+	struct list_head *pos, *tmp;
+	int len, num_qp = atomic_read(&siw_dev->num_qp);
+
+	len = sprintf(buf, "%s: %d QPs %s\n", siw_dev->ofa_dev.name,
+		      num_qp, num_qp ? "- see dmesg for details" : "");
+
+	if (num_qp)
+		printk(KERN_INFO "\n%d QPs on device %s:\n",
+		       num_qp, siw_dev->ofa_dev.name);
+	else
+		return len;
+
+	printk(KERN_INFO "%-7s%-6s%-6s%-5s%-5s%-5s%-5s%-5s%-20s%-20s\n",
+		"QP-ID", "State", "Ref's", "SQ", "RQ", "IRQ", "ORQ", "s/r",
+		"Sock", "CEP");
+
+	list_for_each_safe(pos, tmp, &siw_dev->qp_list) {
+		struct siw_qp *qp = list_entry(pos, struct siw_qp, devq);
+
+		printk(KERN_INFO "%-7d%-6d%-6d%-5d%-5d%-5d%-5d%d/%-3d0x%-17p"
+			" 0x%-18p\n",
+			QP_ID(qp),
+			qp->attrs.state,
+			atomic_read(&qp->hdr.ref.refcount),
+			qp->attrs.sq_size - atomic_read(&qp->sq_space),
+			qp->attrs.rq_size - atomic_read(&qp->rq_space),
+			qp->attrs.ird - atomic_read(&qp->irq_space),
+			qp->attrs.ord - atomic_read(&qp->orq_space),
+			tx_wqe(qp) ? 1 : 0,
+			rx_wqe(qp) ? 1 : 0,
+			qp->attrs.llp_stream_handle,
+			qp->cep);
+	}
+	return len;
+}
+
+static ssize_t show_if_type(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct siw_dev *siw_dev = container_of(dev, struct siw_dev,
+					       ofa_dev.dev);
+
+	return sprintf(buf, "%d\n", siw_dev->attrs.iftype);
+}
+
+static DEVICE_ATTR(sw_version, S_IRUGO, show_sw_version, NULL);
+static DEVICE_ATTR(if_type, S_IRUGO, show_if_type, NULL);
+static DEVICE_ATTR(stats, S_IRUGO, show_stats, NULL);
+static DEVICE_ATTR(qp, S_IRUGO, show_qps, NULL);
+static DEVICE_ATTR(cep, S_IRUGO, show_ceps, NULL);
+
+static struct device_attribute *siw_dev_attributes[] = {
+	&dev_attr_sw_version,
+	&dev_attr_if_type,
+	&dev_attr_stats,
+	&dev_attr_qp,
+	&dev_attr_cep
+};
+
+static int siw_modify_port(struct ib_device *ofa_dev, u8 port, int mask,
+			   struct ib_port_modify *props)
+{
+	return -EOPNOTSUPP;
+}
+
+
+static int siw_register_device(struct siw_dev *dev)
+{
+	struct ib_device *ibdev = &dev->ofa_dev;
+	int rv, i;
+
+	if (dev->l2dev->type != ARPHRD_LOOPBACK)
+		strlcpy(ibdev->name, "siw%d", IB_DEVICE_NAME_MAX);
+	else
+		strlcpy(ibdev->name, "siw_lo%d", IB_DEVICE_NAME_MAX);
+	memset(&ibdev->node_guid, 0, sizeof(ibdev->node_guid));
+	memcpy(&ibdev->node_guid, dev->l2dev->dev_addr, 6);
+
+	ibdev->owner = THIS_MODULE;
+
+	ibdev->uverbs_cmd_mask =
+	    (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
+	    (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
+	    (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
+	    (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
+	    (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
+	    (1ull << IB_USER_VERBS_CMD_REG_MR) |
+	    (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
+	    (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
+	    (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
+	    (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
+	    (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
+	    (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
+	    (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
+	    (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
+	    (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
+	    (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
+	    (1ull << IB_USER_VERBS_CMD_POST_SEND) |
+	    (1ull << IB_USER_VERBS_CMD_POST_RECV) |
+	    (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
+	    (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
+	    (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
+	    (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ) |
+	    (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
+
+	ibdev->node_type = RDMA_NODE_RNIC;
+	memcpy(ibdev->node_desc, SIW_NODE_DESC, sizeof(SIW_NODE_DESC));
+
+	/*
+	 * Current model (one-to-one device association):
+	 * One Softiwarp device per net_device or, equivalently,
+	 * per physical port.
+	 */
+	ibdev->phys_port_cnt = 1;
+
+	ibdev->num_comp_vectors = 1;
+	/*
+	 * While DMA adresses are not used a device must be provided
+	 * as long as the code relies on OFA's ib_umem_get() function for
+	 * memory pinning. calling ib_umem_get() includes a
+	 * (for siw case useless) translation of memory to DMA
+	 * adresses for that device.
+	 */
+	ibdev->dma_device = dev->l2dev->dev.parent;
+	ibdev->query_device = siw_query_device;
+	ibdev->query_port = siw_query_port;
+	ibdev->query_qp = siw_query_qp;
+	ibdev->modify_port = siw_modify_port;
+	ibdev->query_pkey = siw_query_pkey;
+	ibdev->query_gid = siw_query_gid;
+	ibdev->alloc_ucontext = siw_alloc_ucontext;
+	ibdev->dealloc_ucontext = siw_dealloc_ucontext;
+	ibdev->mmap = siw_mmap;
+	ibdev->alloc_pd = siw_alloc_pd;
+	ibdev->dealloc_pd = siw_dealloc_pd;
+	ibdev->create_ah = siw_create_ah;
+	ibdev->destroy_ah = siw_destroy_ah;
+	ibdev->create_qp = siw_create_qp;
+	ibdev->modify_qp = siw_ofed_modify_qp;
+	ibdev->destroy_qp = siw_destroy_qp;
+	ibdev->create_cq = siw_create_cq;
+	ibdev->destroy_cq = siw_destroy_cq;
+	ibdev->resize_cq = NULL;
+	ibdev->poll_cq = siw_poll_cq;
+	ibdev->get_dma_mr = siw_get_dma_mr;
+	ibdev->reg_phys_mr = NULL;
+	ibdev->rereg_phys_mr = NULL;
+	ibdev->reg_user_mr = siw_reg_user_mr;
+	ibdev->dereg_mr = siw_dereg_mr;
+	ibdev->alloc_mw = NULL;
+	ibdev->bind_mw = NULL;
+	ibdev->dealloc_mw = NULL;
+
+	ibdev->create_srq = siw_create_srq;
+	ibdev->modify_srq = siw_modify_srq;
+	ibdev->query_srq = siw_query_srq;
+	ibdev->destroy_srq = siw_destroy_srq;
+	ibdev->post_srq_recv = siw_post_srq_recv;
+
+	ibdev->attach_mcast = NULL;
+	ibdev->detach_mcast = NULL;
+	ibdev->process_mad = siw_no_mad;
+
+	ibdev->req_notify_cq = siw_req_notify_cq;
+	ibdev->post_send = siw_post_send;
+	ibdev->post_recv = siw_post_receive;
+
+	ibdev->dma_ops = &siw_dma_mapping_ops;
+
+	ibdev->iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL);
+	if (!ibdev->iwcm)
+		return -ENOMEM;
+
+	ibdev->iwcm->connect = siw_connect;
+	ibdev->iwcm->accept = siw_accept;
+	ibdev->iwcm->reject = siw_reject;
+	ibdev->iwcm->create_listen = siw_create_listen;
+	ibdev->iwcm->destroy_listen = siw_destroy_listen;
+	ibdev->iwcm->add_ref = siw_qp_get_ref;
+	ibdev->iwcm->rem_ref = siw_qp_put_ref;
+	ibdev->iwcm->get_qp = siw_get_ofaqp;
+	/*
+	 * set and register sw version + user if type
+	 */
+	dev->attrs.version = VERSION_ID_SOFTIWARP;
+	dev->attrs.iftype  = SIW_IF_OFED;
+
+	dev->attrs.vendor_id = SIW_VENDOR_ID;
+	dev->attrs.vendor_part_id = SIW_VENDORT_PART_ID;
+	dev->attrs.sw_version = SIW_SW_VERSION;
+	dev->attrs.max_qp = SIW_MAX_QP;
+	dev->attrs.max_qp_wr = SIW_MAX_QP_WR;
+	dev->attrs.max_ord = SIW_MAX_ORD;
+	dev->attrs.max_ird = SIW_MAX_IRD;
+	dev->attrs.cap_flags = 0;
+	dev->attrs.max_sge = SIW_MAX_SGE;
+	dev->attrs.max_sge_rd = SIW_MAX_SGE_RD;
+	dev->attrs.max_cq = SIW_MAX_CQ;
+	dev->attrs.max_cqe = SIW_MAX_CQE;
+	dev->attrs.max_mr = SIW_MAX_MR;
+	dev->attrs.max_mr_size = rlimit(RLIMIT_MEMLOCK);
+	dev->attrs.max_pd = SIW_MAX_PD;
+	dev->attrs.max_mw = SIW_MAX_MW;
+	dev->attrs.max_fmr = SIW_MAX_FMR;
+	dev->attrs.max_srq = SIW_MAX_SRQ;
+	dev->attrs.max_srq_wr = SIW_MAX_SRQ_WR;
+	dev->attrs.max_srq_sge = SIW_MAX_SGE;
+
+	siw_idr_init(dev);
+	INIT_LIST_HEAD(&dev->cep_list);
+	INIT_LIST_HEAD(&dev->qp_list);
+
+	atomic_set(&dev->num_srq, 0);
+	atomic_set(&dev->num_qp, 0);
+	atomic_set(&dev->num_cq, 0);
+	atomic_set(&dev->num_mem, 0);
+	atomic_set(&dev->num_pd, 0);
+	atomic_set(&dev->num_cep, 0);
+
+	rv = ib_register_device(ibdev, NULL);
+	if (rv) {
+		dprint(DBG_DM|DBG_ON, "(dev=%s): "
+			"ib_register_device failed: rv=%d\n", ibdev->name, rv);
+		return rv;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(siw_dev_attributes); ++i) {
+		rv = device_create_file(&ibdev->dev, siw_dev_attributes[i]);
+		if (rv) {
+			dprint(DBG_DM|DBG_ON, "(dev=%s): "
+				"device_create_file failed: i=%d, rv=%d\n",
+				ibdev->name, i, rv);
+			ib_unregister_device(ibdev);
+			return rv;
+		}
+	}
+
+	dprint(DBG_DM, ": dev 0x%p: Registered '%s' for interface '%s', "
+		"HWaddr=%02x.%02x.%02x.%02x.%02x.%02x\n",
+		dev, ibdev->name, dev->l2dev->name,
+		*(u8 *)dev->l2dev->dev_addr,
+		*((u8 *)dev->l2dev->dev_addr + 1),
+		*((u8 *)dev->l2dev->dev_addr + 2),
+		*((u8 *)dev->l2dev->dev_addr + 3),
+		*((u8 *)dev->l2dev->dev_addr + 4),
+		*((u8 *)dev->l2dev->dev_addr + 5));
+	return 0;
+}
+
+static void siw_deregister_device(struct siw_dev *dev)
+{
+	int i;
+
+	siw_idr_release(dev);
+
+	WARN_ON(atomic_read(&dev->num_srq) || atomic_read(&dev->num_qp) ||
+		atomic_read(&dev->num_cq) || atomic_read(&dev->num_mem) ||
+		atomic_read(&dev->num_pd));
+
+	if (!list_empty(&dev->cep_list)) {
+		int num_ceps = 0;
+
+		show_ceps(&dev->ofa_dev.dev, NULL, NULL);
+		while (!list_empty(&dev->cep_list)) {
+			struct siw_cep  *cep = list_entry(dev->cep_list.next,
+						struct siw_cep, devq);
+			list_del(&cep->devq);
+			kfree(cep);
+			num_ceps++;
+		}
+		printk(KERN_INFO "siw_deregister_device: "
+			"free'd %d orphaned CEPs\n", num_ceps);
+	}
+	for (i = 0; i < ARRAY_SIZE(siw_dev_attributes); ++i)
+		device_remove_file(&dev->ofa_dev.dev, siw_dev_attributes[i]);
+
+	dprint(DBG_OBJ, ": Unregister '%s' for interface '%s'\n",
+		dev->ofa_dev.name, dev->l2dev->name);
+
+	ib_unregister_device(&dev->ofa_dev);
+}
+
+static int siw_match_iflist(struct net_device *dev)
+{
+	int i = 0, found = *iface_list ? 0 : 1;
+
+	while (iface_list[i]) {
+		if (!strcmp(iface_list[i++], dev->name)) {
+			found = 1;
+			break;
+		}
+	}
+	return found;
+}
+
+
+/*
+ * siw_init_module - Initialize Softiwarp module and create Softiwarp devices
+ *
+ * There are three design options for Softiwarp device management supporting
+ * - multiple physical Ethernet ports, i.e., multiple net_device instances
+ * - and multi-homing, i.e., multiple IP addresses associated with net_device,
+ * as follows:
+ *
+ *    Option 1: One Softiwarp device per net_device and
+ *              IP address associated with the net_device
+ *    Option 2: One Softiwarp device per net_device
+ *              (and all IP addresses associated with the net_device)
+ *    Option 3: Single Softiwarp device for all net_device instances
+ *              (and all IP addresses associated with these instances)
+ *
+ * We currently use Option 2, registering a separate siw_dev for
+ * each net_device.
+ *
+ * TODO: Dynamic device management (network device registration/removal).
+ *       IPv6 support.
+ */
+static __init int siw_init_module(void)
+{
+	struct net_device	*dev;
+	struct siw_dev		*siw_p;
+	int rv = 0;
+
+	/*
+	 * Identify all net_device instances and create a
+	 * Softiwarp device for each net_device supporting IPv4
+	 *
+	 * TODO:
+	 * - Do we have to generalize for IPv6?
+	 * - Exclude devices based on IPoIB - if any
+	 * - Consider excluding Ethernet devices with an
+	 *   associated iWARP hardware device
+	 */
+	rtnl_lock();
+	for_each_netdev(&init_net, dev) {
+		struct in_device *in_dev;
+
+		in_dev = in_dev_get(dev);
+		if (!in_dev) {
+			dprint(DBG_DM, ": Skipped %s (no indev)\n", dev->name);
+			continue;
+		}
+		if (!in_dev->ifa_list) {
+			dprint(DBG_DM, ": Skipped %s (no ifa)\n", dev->name);
+			in_dev_put(in_dev);
+			continue;
+		}
+		/*
+		 * This device has an in_device attached. Attach to it
+		 * if it is LOOPBACK or ETHER or IEEE801-TR device.
+		 *
+		 * Additional hardware support can be added here
+		 * (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see
+		 * <linux/if_arp.h> for type identifiers.
+		 *
+		 * NOTE: ARPHRD_TUNNEL/6 are excluded.
+		 */
+		if (dev->type == ARPHRD_ETHER ||
+		    dev->type == ARPHRD_IEEE802 ||
+		    (dev->type == ARPHRD_LOOPBACK && loopback_enabled)) {
+			if (!siw_match_iflist(dev)) {
+				dprint(DBG_DM|DBG_ON, ": %s (not selected)\n",
+					dev->name);
+				in_dev_put(in_dev);
+				continue;
+			}
+#ifdef CHECK_DMA_CAPABILITIES
+			if (!dev->dev.parent ||
+			    !get_dma_ops(dev->dev.parent)) {
+				dprint(DBG_DM|DBG_ON,
+					": No DMA ops: %s (skipped)\n",
+					dev->name);
+				in_dev_put(in_dev);
+				continue;
+			}
+#endif
+			siw_p =
+			      (struct siw_dev *)ib_alloc_device(sizeof *siw_p);
+
+			if (!siw_p) {
+				in_dev_put(in_dev);
+				rv = -ENOMEM;
+				break;
+			}
+
+			siw_p->l2dev = dev;
+			list_add_tail(&siw_p->list, &siw_devlist);
+
+			rv = siw_register_device(siw_p);
+			if (rv) {
+				list_del(&siw_p->list);
+				in_dev_put(in_dev);
+				ib_dealloc_device(&siw_p->ofa_dev);
+
+				break;
+			}
+		} else {
+			dprint(DBG_DM, ": Skipped %s (type %d)\n",
+				dev->name, dev->type);
+			in_dev_put(in_dev);
+		}
+	}
+	rtnl_unlock();
+
+	if (list_empty(&siw_devlist))
+		return -ENODEV;
+
+	if (rv)
+		return rv;
+	/*
+	 * FIXME: In case of error, we leave devices allocated.
+	 *        Is this correct?
+	 */
+	rv = siw_cm_init();
+	if (rv)
+		return rv;
+
+	rv = siw_sq_worker_init();
+
+	atomic_set(&siw_num_wqe, 0);
+	atomic_set(&siw_num_cep, 0);
+
+	printk(KERN_INFO "SoftIWARP attached\n");
+	return rv;
+}
+
+static void __exit siw_exit_module(void)
+{
+	siw_sq_worker_exit();
+	siw_cm_exit();
+
+	while (!list_empty(&siw_devlist)) {
+		struct siw_dev  *siw_p =
+			list_entry(siw_devlist.next, struct siw_dev, list);
+		list_del(&siw_p->list);
+		siw_deregister_device(siw_p);
+		in_dev_put(siw_p->l2dev->ip_ptr);
+		ib_dealloc_device(&siw_p->ofa_dev);
+	}
+	printk(KERN_INFO "SoftIWARP detached\n");
+}
+
+module_init(siw_init_module);
+module_exit(siw_exit_module);
-- 
1.5.4.3

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