module that implements a soft IB device using ib_rxe in loopback.
Signed-off-by: Bob Pearson <rpear...@systemfabricworks.com>
---
drivers/infiniband/hw/rxe/rxe_sample.c | 226 +++++++++++++++++++++++++++++++++
1 file changed, 226 insertions(+)
Index: infiniband/drivers/infiniband/hw/rxe/rxe_sample.c
===================================================================
--- /dev/null
+++ infiniband/drivers/infiniband/hw/rxe/rxe_sample.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2009-2011 System Fabric Works, 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.
+ */
+
+/*
+ * sample driver for IB transport over rxe
+ * implements a simple loopback device on module load
+ */
+
+#include <linux/skbuff.h>
+
+#include <linux/device.h>
+
+#include "rxe.h"
+
+MODULE_AUTHOR("Bob Pearson");
+MODULE_DESCRIPTION("RDMA transport over Converged Enhanced Ethernet");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static __be64 node_guid(struct rxe_dev *rxe)
+{
+ return 0x3333333333333333ULL;
+}
+
+static __be64 port_guid(struct rxe_dev *rxe, unsigned int port_num)
+{
+ return 0x4444444444444444ULL;
+}
+
+/*
+ * the ofed core requires that we provide a valid device
+ * object for registration
+ */
+static struct class *my_class;
+static struct device *my_dev;
+
+static struct device *dma_device(struct rxe_dev *rxe)
+{
+ return my_dev;
+}
+
+static int mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
+{
+ return 0;
+}
+
+static int mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
+{
+ return 0;
+}
+
+/* just loopback packet */
+static int send(struct rxe_dev *rxe, struct sk_buff *skb)
+{
+ struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+
+ pkt->rxe = rxe;
+ pkt->mask = RXE_LRH_MASK;
+
+ return rxe_rcv(skb);
+}
+
+static struct sk_buff *init_packet(struct rxe_dev *rxe, struct rxe_av *av,
+ int paylen)
+{
+ struct sk_buff *skb;
+ struct rxe_pkt_info *pkt;
+
+ paylen += RXE_LRH_BYTES;
+
+ if (av->attr.ah_flags & IB_AH_GRH)
+ paylen += RXE_GRH_BYTES;
+
+ skb = alloc_skb(paylen, GFP_ATOMIC);
+ if (!skb)
+ return NULL;
+
+ skb->dev = NULL;
+ skb->protocol = 0;
+
+ pkt = SKB_TO_PKT(skb);
+ pkt->rxe = rxe;
+ pkt->port_num = 1;
+ pkt->hdr = skb_put(skb, paylen);
+ pkt->mask = RXE_LRH_MASK;
+ if (av->attr.ah_flags & IB_AH_GRH)
+ pkt->mask |= RXE_GRH_MASK;
+
+ return skb;
+}
+
+static int init_av(struct rxe_dev *rxe, struct ib_ah_attr *attr,
+ struct rxe_av *av)
+{
+ if (!av->attr.dlid)
+ av->attr.dlid = 1;
+ return 0;
+}
+
+static char *parent_name(struct rxe_dev *rxe, unsigned int port_num)
+{
+ return "sample";
+}
+
+static enum rdma_link_layer link_layer(struct rxe_dev *rxe,
+ unsigned int port_num)
+{
+ return IB_LINK_LAYER_INFINIBAND;
+}
+
+static struct rxe_ifc_ops ifc_ops = {
+ .node_guid = node_guid,
+ .port_guid = port_guid,
+ .dma_device = dma_device,
+ .mcast_add = mcast_add,
+ .mcast_delete = mcast_delete,
+ .send = send,
+ .init_packet = init_packet,
+ .init_av = init_av,
+ .parent_name = parent_name,
+ .link_layer = link_layer,
+};
+
+static struct rxe_dev *rxe_sample;
+
+static int rxe_sample_add(void)
+{
+ int err;
+ struct rxe_port *port;
+
+ rxe_sample = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe_sample));
+ if (!rxe_sample) {
+ err = -ENOMEM;
+ goto err1;
+ }
+
+ rxe_sample->ifc_ops = &ifc_ops;
+
+ err = rxe_add(rxe_sample, 4500);
+ if (err)
+ goto err2;
+
+ /* bit of a hack */
+ port = &rxe_sample->port[0];
+ port->attr.state = IB_PORT_ACTIVE;
+ port->attr.phys_state = 5;
+ port->attr.max_mtu = IB_MTU_4096;
+ port->attr.active_mtu = IB_MTU_4096;
+ port->mtu_cap = IB_MTU_4096;
+ port->attr.lid = 1;
+
+ pr_info("rxe_sample: added %s\n",
+ rxe_sample->ib_dev.name);
+ return 0;
+
+err2:
+ ib_dealloc_device(&rxe_sample->ib_dev);
+err1:
+ return err;
+}
+
+static void rxe_sample_remove(void)
+{
+ if (!rxe_sample)
+ goto done;
+
+ rxe_remove(rxe_sample);
+
+ pr_info("rxe_sample: removed %s\n",
+ rxe_sample->ib_dev.name);
+done:
+ return;
+}
+
+static int __init rxe_sample_init(void)
+{
+ int err;
+
+ rxe_crc_disable = 1;
+
+ my_class = class_create(THIS_MODULE, "foo");
+ my_dev = device_create(my_class, NULL, 0, NULL, "bar");
+
+ err = rxe_sample_add();
+ return err;
+}
+
+static void __exit rxe_sample_exit(void)
+{
+ rxe_sample_remove();
+
+ device_destroy(my_class, my_dev->devt);
+ class_destroy(my_class);
+ return;
+}
+
+module_init(rxe_sample_init);
+module_exit(rxe_sample_exit);
--
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