Message-Id: <1286261640-5121-1-git-send-email-bmt@zurich.ibm.com>
Date:	Tue,  5 Oct 2010 08:54:00 +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] SIW: Module initialization

---
 drivers/infiniband/hw/siw/siw_main.c |  440 ++++++++++++++++++++++++++++++++++
 1 files changed, 440 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..4eec70b
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_main.c
@@ -0,0 +1,440 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2010, 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 <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");
+
+static int loopback_enabled;
+module_param(loopback_enabled, int, 0644);
+MODULE_PARM_DESC(loopback_enabled, "enable_loopback");
+
+struct siw_dev *siw_device;
+
+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_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 struct device_attribute *siw_dev_attributes[] = {
+	&dev_attr_sw_version,
+	&dev_attr_if_type
+};
+
+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 = NULL;
+	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->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;
+	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;
+	}
+
+	/*
+	 * 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 = SIW_MAX_MR_SIZE;
+	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);
+
+	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);
+
+	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, ": Registered '%s' for interface '%s', "
+		"HWaddr=%02x.%02x.%02x.%02x.%02x.%02x\n",
+		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;
+}
+
+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));
+
+	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);
+}
+
+
+/*
+ * 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 in_dev)\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)) {
+#ifdef CHECK_DMA_CAPABILITIES
+			if (!dev->dev.parent || !get_dma_ops(dev->dev.parent)) {
+				dprint(DBG_DM|DBG_ON,
+					": No DMA capabilities: %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;
+			}
+			if (!siw_device) {
+				siw_device = siw_p;
+				siw_p->next = NULL;
+			} else {
+				siw_p->next = siw_device->next;
+				siw_device->next = siw_p;
+			}
+			siw_p->l2dev = dev;
+
+			rv = siw_register_device(siw_p);
+			if (rv) {
+				if (siw_device != siw_p)
+					siw_device->next = siw_p->next;
+				else
+					siw_device = NULL;
+
+				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 (!siw_device)
+		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();
+
+	printk(KERN_INFO "SoftIWARP attached\n");
+	return rv;
+}
+
+static void __exit siw_exit_module(void)
+{
+	struct siw_dev	*siw_p;
+
+	siw_sq_worker_exit();
+	siw_cm_exit();
+
+	while (siw_device) {
+		siw_p = siw_device->next;
+		siw_deregister_device(siw_device);
+		in_dev_put(siw_device->l2dev->ip_ptr);
+		ib_dealloc_device(&siw_device->ofa_dev);
+		siw_device = siw_p;
+	}
+	printk(KERN_INFO "SoftIWARP detached\n");
+}
+
+module_init(siw_init_module);
+module_exit(siw_exit_module);
-- 
1.5.4.3

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