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+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@zurich.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);