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authorMoni Shoua <monis@mellanox.com>2016-06-16 16:45:23 +0300
committerDoug Ledford <dledford@redhat.com>2016-08-04 11:13:12 -0400
commit8700e3e7c4857d28ebaa824509934556da0b3e76 (patch)
tree16df6bc7f4764311d5ec0c6a311eaf3b95a269e3 /drivers/infiniband/sw/rxe/rxe.c
parentLinux 4.7-rc4 (diff)
downloadlinux-dev-8700e3e7c4857d28ebaa824509934556da0b3e76.tar.xz
linux-dev-8700e3e7c4857d28ebaa824509934556da0b3e76.zip
Soft RoCE driver
Soft RoCE (RXE) - The software RoCE driver ib_rxe implements the RDMA transport and registers to the RDMA core device as a kernel verbs provider. It also implements the packet IO layer. On the other hand ib_rxe registers to the Linux netdev stack as a udp encapsulating protocol, in that case RDMA, for sending and receiving packets over any Ethernet device. This yields a RDMA transport over the UDP/Ethernet network layer forming a RoCEv2 compatible device. The configuration procedure of the Soft RoCE drivers requires binding to any existing Ethernet network device. This is done with /sys interface. A userspace Soft RoCE library (librxe) provides user applications the ability to run with Soft RoCE devices. The use of rxe verbs ins user space requires the inclusion of librxe as a device specifics plug-in to libibverbs. librxe is packaged separately. Architecture: +-----------------------------------------------------------+ | Application | +-----------------------------------------------------------+ +-----------------------------------+ | libibverbs | User +-----------------------------------+ +----------------+ +----------------+ | librxe | | HW RoCE lib | +----------------+ +----------------+ +---------------------------------------------------------------+ +--------------+ +------------+ | Sockets | | RDMA ULP | +--------------+ +------------+ +--------------+ +---------------------+ | TCP/IP | | ib_core | +--------------+ +---------------------+ +------------+ +----------------+ Kernel | ib_rxe | | HW RoCE driver | +------------+ +----------------+ +------------------------------------+ | NIC driver | +------------------------------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +-----------------------------------------------------------+ | Application | +-----------------------------------------------------------+ +-----------------------------------+ | libibverbs | User +-----------------------------------+ +----------------+ +----------------+ | librxe | | HW RoCE lib | +----------------+ +----------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +--------------+ +------------+ | Sockets | | RDMA ULP | +--------------+ +------------+ +--------------+ +---------------------+ | TCP/IP | | ib_core | +--------------+ +---------------------+ +------------+ +----------------+ Kernel | ib_rxe | | HW RoCE driver | +------------+ +----------------+ +------------------------------------+ | NIC driver | +------------------------------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Soft RoCE resources: [1[ https://github.com/SoftRoCE/librxe-dev librxe - source code in Github [2] https://github.com/SoftRoCE/rxe-dev/wiki/rxe-dev:-Home - Soft RoCE Wiki page [3] https://github.com/SoftRoCE/librxe-dev - Soft RoCE userspace library Signed-off-by: Kamal Heib <kamalh@mellanox.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: Moni Shoua <monis@mellanox.com> Reviewed-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe.c')
-rw-r--r--drivers/infiniband/sw/rxe/rxe.c386
1 files changed, 386 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
new file mode 100644
index 000000000000..55f0e8f0ca79
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe.c
@@ -0,0 +1,386 @@
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 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.
+ */
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+MODULE_AUTHOR("Bob Pearson, Frank Zago, John Groves, Kamal Heib");
+MODULE_DESCRIPTION("Soft RDMA transport");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION("0.2");
+
+/* free resources for all ports on a device */
+static void rxe_cleanup_ports(struct rxe_dev *rxe)
+{
+ kfree(rxe->port.pkey_tbl);
+ rxe->port.pkey_tbl = NULL;
+
+}
+
+/* free resources for a rxe device all objects created for this device must
+ * have been destroyed
+ */
+static void rxe_cleanup(struct rxe_dev *rxe)
+{
+ rxe_pool_cleanup(&rxe->uc_pool);
+ rxe_pool_cleanup(&rxe->pd_pool);
+ rxe_pool_cleanup(&rxe->ah_pool);
+ rxe_pool_cleanup(&rxe->srq_pool);
+ rxe_pool_cleanup(&rxe->qp_pool);
+ rxe_pool_cleanup(&rxe->cq_pool);
+ rxe_pool_cleanup(&rxe->mr_pool);
+ rxe_pool_cleanup(&rxe->mw_pool);
+ rxe_pool_cleanup(&rxe->mc_grp_pool);
+ rxe_pool_cleanup(&rxe->mc_elem_pool);
+
+ rxe_cleanup_ports(rxe);
+}
+
+/* called when all references have been dropped */
+void rxe_release(struct kref *kref)
+{
+ struct rxe_dev *rxe = container_of(kref, struct rxe_dev, ref_cnt);
+
+ rxe_cleanup(rxe);
+ ib_dealloc_device(&rxe->ib_dev);
+}
+
+void rxe_dev_put(struct rxe_dev *rxe)
+{
+ kref_put(&rxe->ref_cnt, rxe_release);
+}
+EXPORT_SYMBOL_GPL(rxe_dev_put);
+
+/* initialize rxe device parameters */
+static int rxe_init_device_param(struct rxe_dev *rxe)
+{
+ rxe->max_inline_data = RXE_MAX_INLINE_DATA;
+
+ rxe->attr.fw_ver = RXE_FW_VER;
+ rxe->attr.max_mr_size = RXE_MAX_MR_SIZE;
+ rxe->attr.page_size_cap = RXE_PAGE_SIZE_CAP;
+ rxe->attr.vendor_id = RXE_VENDOR_ID;
+ rxe->attr.vendor_part_id = RXE_VENDOR_PART_ID;
+ rxe->attr.hw_ver = RXE_HW_VER;
+ rxe->attr.max_qp = RXE_MAX_QP;
+ rxe->attr.max_qp_wr = RXE_MAX_QP_WR;
+ rxe->attr.device_cap_flags = RXE_DEVICE_CAP_FLAGS;
+ rxe->attr.max_sge = RXE_MAX_SGE;
+ rxe->attr.max_sge_rd = RXE_MAX_SGE_RD;
+ rxe->attr.max_cq = RXE_MAX_CQ;
+ rxe->attr.max_cqe = (1 << RXE_MAX_LOG_CQE) - 1;
+ rxe->attr.max_mr = RXE_MAX_MR;
+ rxe->attr.max_pd = RXE_MAX_PD;
+ rxe->attr.max_qp_rd_atom = RXE_MAX_QP_RD_ATOM;
+ rxe->attr.max_ee_rd_atom = RXE_MAX_EE_RD_ATOM;
+ rxe->attr.max_res_rd_atom = RXE_MAX_RES_RD_ATOM;
+ rxe->attr.max_qp_init_rd_atom = RXE_MAX_QP_INIT_RD_ATOM;
+ rxe->attr.max_ee_init_rd_atom = RXE_MAX_EE_INIT_RD_ATOM;
+ rxe->attr.atomic_cap = RXE_ATOMIC_CAP;
+ rxe->attr.max_ee = RXE_MAX_EE;
+ rxe->attr.max_rdd = RXE_MAX_RDD;
+ rxe->attr.max_mw = RXE_MAX_MW;
+ rxe->attr.max_raw_ipv6_qp = RXE_MAX_RAW_IPV6_QP;
+ rxe->attr.max_raw_ethy_qp = RXE_MAX_RAW_ETHY_QP;
+ rxe->attr.max_mcast_grp = RXE_MAX_MCAST_GRP;
+ rxe->attr.max_mcast_qp_attach = RXE_MAX_MCAST_QP_ATTACH;
+ rxe->attr.max_total_mcast_qp_attach = RXE_MAX_TOT_MCAST_QP_ATTACH;
+ rxe->attr.max_ah = RXE_MAX_AH;
+ rxe->attr.max_fmr = RXE_MAX_FMR;
+ rxe->attr.max_map_per_fmr = RXE_MAX_MAP_PER_FMR;
+ rxe->attr.max_srq = RXE_MAX_SRQ;
+ rxe->attr.max_srq_wr = RXE_MAX_SRQ_WR;
+ rxe->attr.max_srq_sge = RXE_MAX_SRQ_SGE;
+ rxe->attr.max_fast_reg_page_list_len = RXE_MAX_FMR_PAGE_LIST_LEN;
+ rxe->attr.max_pkeys = RXE_MAX_PKEYS;
+ rxe->attr.local_ca_ack_delay = RXE_LOCAL_CA_ACK_DELAY;
+
+ rxe->max_ucontext = RXE_MAX_UCONTEXT;
+
+ return 0;
+}
+
+/* initialize port attributes */
+static int rxe_init_port_param(struct rxe_port *port)
+{
+ port->attr.state = RXE_PORT_STATE;
+ port->attr.max_mtu = RXE_PORT_MAX_MTU;
+ port->attr.active_mtu = RXE_PORT_ACTIVE_MTU;
+ port->attr.gid_tbl_len = RXE_PORT_GID_TBL_LEN;
+ port->attr.port_cap_flags = RXE_PORT_PORT_CAP_FLAGS;
+ port->attr.max_msg_sz = RXE_PORT_MAX_MSG_SZ;
+ port->attr.bad_pkey_cntr = RXE_PORT_BAD_PKEY_CNTR;
+ port->attr.qkey_viol_cntr = RXE_PORT_QKEY_VIOL_CNTR;
+ port->attr.pkey_tbl_len = RXE_PORT_PKEY_TBL_LEN;
+ port->attr.lid = RXE_PORT_LID;
+ port->attr.sm_lid = RXE_PORT_SM_LID;
+ port->attr.lmc = RXE_PORT_LMC;
+ port->attr.max_vl_num = RXE_PORT_MAX_VL_NUM;
+ port->attr.sm_sl = RXE_PORT_SM_SL;
+ port->attr.subnet_timeout = RXE_PORT_SUBNET_TIMEOUT;
+ port->attr.init_type_reply = RXE_PORT_INIT_TYPE_REPLY;
+ port->attr.active_width = RXE_PORT_ACTIVE_WIDTH;
+ port->attr.active_speed = RXE_PORT_ACTIVE_SPEED;
+ port->attr.phys_state = RXE_PORT_PHYS_STATE;
+ port->mtu_cap =
+ ib_mtu_enum_to_int(RXE_PORT_ACTIVE_MTU);
+ port->subnet_prefix = cpu_to_be64(RXE_PORT_SUBNET_PREFIX);
+
+ return 0;
+}
+
+/* initialize port state, note IB convention that HCA ports are always
+ * numbered from 1
+ */
+static int rxe_init_ports(struct rxe_dev *rxe)
+{
+ struct rxe_port *port = &rxe->port;
+
+ rxe_init_port_param(port);
+
+ if (!port->attr.pkey_tbl_len || !port->attr.gid_tbl_len)
+ return -EINVAL;
+
+ port->pkey_tbl = kcalloc(port->attr.pkey_tbl_len,
+ sizeof(*port->pkey_tbl), GFP_KERNEL);
+
+ if (!port->pkey_tbl)
+ return -ENOMEM;
+
+ port->pkey_tbl[0] = 0xffff;
+ port->port_guid = rxe->ifc_ops->port_guid(rxe);
+
+ spin_lock_init(&port->port_lock);
+
+ return 0;
+}
+
+/* init pools of managed objects */
+static int rxe_init_pools(struct rxe_dev *rxe)
+{
+ int err;
+
+ err = rxe_pool_init(rxe, &rxe->uc_pool, RXE_TYPE_UC,
+ rxe->max_ucontext);
+ if (err)
+ goto err1;
+
+ err = rxe_pool_init(rxe, &rxe->pd_pool, RXE_TYPE_PD,
+ rxe->attr.max_pd);
+ if (err)
+ goto err2;
+
+ err = rxe_pool_init(rxe, &rxe->ah_pool, RXE_TYPE_AH,
+ rxe->attr.max_ah);
+ if (err)
+ goto err3;
+
+ err = rxe_pool_init(rxe, &rxe->srq_pool, RXE_TYPE_SRQ,
+ rxe->attr.max_srq);
+ if (err)
+ goto err4;
+
+ err = rxe_pool_init(rxe, &rxe->qp_pool, RXE_TYPE_QP,
+ rxe->attr.max_qp);
+ if (err)
+ goto err5;
+
+ err = rxe_pool_init(rxe, &rxe->cq_pool, RXE_TYPE_CQ,
+ rxe->attr.max_cq);
+ if (err)
+ goto err6;
+
+ err = rxe_pool_init(rxe, &rxe->mr_pool, RXE_TYPE_MR,
+ rxe->attr.max_mr);
+ if (err)
+ goto err7;
+
+ err = rxe_pool_init(rxe, &rxe->mw_pool, RXE_TYPE_MW,
+ rxe->attr.max_mw);
+ if (err)
+ goto err8;
+
+ err = rxe_pool_init(rxe, &rxe->mc_grp_pool, RXE_TYPE_MC_GRP,
+ rxe->attr.max_mcast_grp);
+ if (err)
+ goto err9;
+
+ err = rxe_pool_init(rxe, &rxe->mc_elem_pool, RXE_TYPE_MC_ELEM,
+ rxe->attr.max_total_mcast_qp_attach);
+ if (err)
+ goto err10;
+
+ return 0;
+
+err10:
+ rxe_pool_cleanup(&rxe->mc_grp_pool);
+err9:
+ rxe_pool_cleanup(&rxe->mw_pool);
+err8:
+ rxe_pool_cleanup(&rxe->mr_pool);
+err7:
+ rxe_pool_cleanup(&rxe->cq_pool);
+err6:
+ rxe_pool_cleanup(&rxe->qp_pool);
+err5:
+ rxe_pool_cleanup(&rxe->srq_pool);
+err4:
+ rxe_pool_cleanup(&rxe->ah_pool);
+err3:
+ rxe_pool_cleanup(&rxe->pd_pool);
+err2:
+ rxe_pool_cleanup(&rxe->uc_pool);
+err1:
+ return err;
+}
+
+/* initialize rxe device state */
+static int rxe_init(struct rxe_dev *rxe)
+{
+ int err;
+
+ /* init default device parameters */
+ rxe_init_device_param(rxe);
+
+ err = rxe_init_ports(rxe);
+ if (err)
+ goto err1;
+
+ err = rxe_init_pools(rxe);
+ if (err)
+ goto err2;
+
+ /* init pending mmap list */
+ spin_lock_init(&rxe->mmap_offset_lock);
+ spin_lock_init(&rxe->pending_lock);
+ INIT_LIST_HEAD(&rxe->pending_mmaps);
+ INIT_LIST_HEAD(&rxe->list);
+
+ mutex_init(&rxe->usdev_lock);
+
+ return 0;
+
+err2:
+ rxe_cleanup_ports(rxe);
+err1:
+ return err;
+}
+
+int rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
+{
+ struct rxe_port *port = &rxe->port;
+ enum ib_mtu mtu;
+
+ mtu = eth_mtu_int_to_enum(ndev_mtu);
+
+ /* Make sure that new MTU in range */
+ mtu = mtu ? min_t(enum ib_mtu, mtu, RXE_PORT_MAX_MTU) : IB_MTU_256;
+
+ port->attr.active_mtu = mtu;
+ port->mtu_cap = ib_mtu_enum_to_int(mtu);
+
+ return 0;
+}
+EXPORT_SYMBOL(rxe_set_mtu);
+
+/* called by ifc layer to create new rxe device.
+ * The caller should allocate memory for rxe by calling ib_alloc_device.
+ */
+int rxe_add(struct rxe_dev *rxe, unsigned int mtu)
+{
+ int err;
+
+ kref_init(&rxe->ref_cnt);
+
+ err = rxe_init(rxe);
+ if (err)
+ goto err1;
+
+ err = rxe_set_mtu(rxe, mtu);
+ if (err)
+ goto err1;
+
+ err = rxe_register_device(rxe);
+ if (err)
+ goto err1;
+
+ return 0;
+
+err1:
+ rxe_dev_put(rxe);
+ return err;
+}
+EXPORT_SYMBOL(rxe_add);
+
+/* called by the ifc layer to remove a device */
+void rxe_remove(struct rxe_dev *rxe)
+{
+ rxe_unregister_device(rxe);
+
+ rxe_dev_put(rxe);
+}
+EXPORT_SYMBOL(rxe_remove);
+
+static int __init rxe_module_init(void)
+{
+ int err;
+
+ /* initialize slab caches for managed objects */
+ err = rxe_cache_init();
+ if (err) {
+ pr_err("rxe: unable to init object pools\n");
+ return err;
+ }
+
+ err = rxe_net_init();
+ if (err) {
+ pr_err("rxe: unable to init\n");
+ rxe_cache_exit();
+ return err;
+ }
+ pr_info("rxe: loaded\n");
+
+ return 0;
+}
+
+static void __exit rxe_module_exit(void)
+{
+ rxe_remove_all();
+ rxe_net_exit();
+ rxe_cache_exit();
+
+ pr_info("rxe: unloaded\n");
+}
+
+module_init(rxe_module_init);
+module_exit(rxe_module_exit);