[v4,03/13] SIW network and RDMA core interface

Message ID	20190130172136.23625-4-bmt@zurich.ibm.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-rdma-owner@kernel.org> Gateway: Authorized Use Only! Violators will be prosecuted for <linux-rdma@vger.kernel.org> from <bmt@zurich.ibm.com>; Wed, 30 Jan 2019 17:22:00 -0000 Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 30 Jan 2019 17:21:57 -0000 From: bmt@zurich.ibm.com To: linux-rdma@vger.kernel.org Cc: Bernard Metzler <bmt@zurich.ibm.com> Subject: [PATCH v4 03/13] SIW network and RDMA core interface Date: Wed, 30 Jan 2019 18:21:26 +0100 In-Reply-To: <20190130172136.23625-1-bmt@zurich.ibm.com> References: <20190130172136.23625-1-bmt@zurich.ibm.com> Message-Id: <20190130172136.23625-4-bmt@zurich.ibm.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk
Series	SIW: Request for Comments \| expand [v4,00/13] SIW: Request for Comments [v4,01/13] iWarp wire packet format [v4,02/13] SIW main include file [v4,03/13] SIW network and RDMA core interface [v4,04/13] SIW object management [v4,05/13] SIW connection management [v4,06/13] SIW application interface [v4,07/13] SIW application buffer management [v4,08/13] SIW queue pair methods [v4,09/13] SIW transmit path [v4,10/13] SIW receive path [v4,11/13] SIW completion queue methods [v4,12/13] SIW debugging [v4,13/13] SIW addition to kernel build environment

diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c new file mode 100644 index 000000000000..e8b12efd053e --- /dev/null +++ b/drivers/infiniband/sw/siw/siw_main.c @@ -0,0 +1,846 @@ +/* + * Software iWARP device driver + * + * Authors: Bernard Metzler <bmt@zurich.ibm.com> + * + * Copyright (c) 2008-2019, 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/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 <linux/kernel.h> +#include <linux/dma-mapping.h> + +#include <rdma/ib_verbs.h> +#include <rdma/ib_smi.h> +#include <rdma/ib_user_verbs.h> +#include <rdma/rdma_netlink.h> + +#include "siw.h" +#include "siw_obj.h" +#include "siw_cm.h" +#include "siw_verbs.h" +#include <linux/kthread.h> + +MODULE_AUTHOR("Bernard Metzler"); +MODULE_DESCRIPTION("Software iWARP Driver"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION("0.2"); + +/* transmit from user buffer, if possible */ +const bool zcopy_tx = true; + +/* Restrict usage of GSO, if hardware peer iwarp is unable to process + * large packets. gso_seg_limit = 1 lets siw send only packets up to + * one real MTU in size, but severly limits maximum bandwidth. + * gso_seg_limit = 0 makes use of GSO (and more than doubles throughput + * for large transfers). + */ +const int gso_seg_limit; + +/* Attach siw also with loopback devices */ +const bool loopback_enabled = true; + +/* We try to negotiate CRC on, if true */ +const bool mpa_crc_required; + +/* MPA CRC on/off enforced */ +const bool mpa_crc_strict; + +/* Set TCP_NODELAY, and push messages asap */ +const bool siw_tcp_nagle; + +/* Select MPA version to be used during connection setup */ +u_char mpa_version = MPA_REVISION_2; + +/* Selects MPA P2P mode (additional handshake during connection + * setup, if true. + */ +const bool peer_to_peer; + +struct task_struct *siw_tx_thread[NR_CPUS]; +struct crypto_shash *siw_crypto_shash; + +static ssize_t sw_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%x\n", VERSION_ID_SOFTIWARP); +} + +static DEVICE_ATTR_RO(sw_version); + +static ssize_t parent_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct siw_device *sdev = + rdma_device_to_drv_device(device, struct siw_device, base_dev); + + return snprintf(buf, 16, "%s\n", sdev->netdev->name); +} + +static DEVICE_ATTR_RO(parent); + +static struct attribute *siw_dev_attributes[] = { + &dev_attr_sw_version.attr, + &dev_attr_parent.attr, + NULL, +}; + +static const struct attribute_group siw_attr_group = { + .attrs = siw_dev_attributes, +}; + +static int siw_modify_port(struct ib_device *base_dev, u8 port, int mask, + struct ib_port_modify *props) +{ + return -EOPNOTSUPP; +} + +static int siw_device_register(struct siw_device *sdev, const char *name) +{ + struct ib_device *base_dev = &sdev->base_dev; + static int dev_id = 1; + int rv; + + base_dev->driver_id = RDMA_DRIVER_SIW; + rdma_set_device_sysfs_group(base_dev, &siw_attr_group); + + rv = ib_register_device(base_dev, name); + if (rv) { + pr_warn("siw: device registration error %d\n", rv); + return rv; + } + siw_debugfs_add_device(sdev); + + sdev->vendor_part_id = dev_id++; + + siw_dbg(sdev, "HWaddr=%02x.%02x.%02x.%02x.%02x.%02x\n", + *(u8 *)sdev->netdev->dev_addr, + *((u8 *)sdev->netdev->dev_addr + 1), + *((u8 *)sdev->netdev->dev_addr + 2), + *((u8 *)sdev->netdev->dev_addr + 3), + *((u8 *)sdev->netdev->dev_addr + 4), + *((u8 *)sdev->netdev->dev_addr + 5)); + + return 0; +} + +static void siw_device_cleanup(struct siw_device *sdev) +{ + siw_debugfs_del_device(sdev); + + if (atomic_read(&sdev->num_ctx) || atomic_read(&sdev->num_srq) || + atomic_read(&sdev->num_mr) || atomic_read(&sdev->num_cep) || + atomic_read(&sdev->num_qp) || atomic_read(&sdev->num_cq) || + atomic_read(&sdev->num_pd)) { + pr_warn("siw at %s: orphaned resources!\n", + sdev->netdev->name); + pr_warn(" CTX %d, SRQ %d, QP %d, CQ %d, MEM %d, CEP %d, PD %d\n", + atomic_read(&sdev->num_ctx), + atomic_read(&sdev->num_srq), + atomic_read(&sdev->num_qp), + atomic_read(&sdev->num_cq), + atomic_read(&sdev->num_mr), + atomic_read(&sdev->num_cep), + atomic_read(&sdev->num_pd)); + } + + while (!list_empty(&sdev->cep_list)) { + struct siw_cep *cep = list_entry(sdev->cep_list.next, + struct siw_cep, devq); + list_del(&cep->devq); + pr_warn("siw: at %s: free orphaned CEP 0x%p, state %d\n", + sdev->base_dev.name, cep, cep->state); + kfree(cep); + } +} + +static void siw_device_destroy(struct siw_device *sdev) +{ + siw_idr_release(sdev); + kfree(sdev->base_dev.iwcm); + dev_put(sdev->netdev); +} + +/* + * Returns siw device if registered for given net device. + * Increments reference count on contained base ib_device, + * if siw device was found (via ib_device_get_by_netdev()). + */ +static struct siw_device *siw_dev_from_netdev(struct net_device *netdev) +{ + struct ib_device *base_dev = + ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); + + return (base_dev != NULL) ? siw_dev_base2siw(base_dev) : NULL; +} + +static struct net_device *siw_get_netdev(struct ib_device *base_dev, u8 port) +{ + struct siw_device *sdev = siw_dev_base2siw(base_dev); + + if (!sdev->netdev) + return NULL; + + dev_hold(sdev->netdev); + + return sdev->netdev; +} + +static int siw_create_tx_threads(void) +{ + int cpu, rv, assigned = 0; + + for_each_online_cpu(cpu) { + /* Skip HT cores */ + if (cpu % cpumask_weight(topology_sibling_cpumask(cpu))) { + siw_tx_thread[cpu] = NULL; + continue; + } + siw_tx_thread[cpu] = kthread_create(siw_run_sq, + (unsigned long *)(long)cpu, + "siw_tx/%d", cpu); + if (IS_ERR(siw_tx_thread[cpu])) { + rv = PTR_ERR(siw_tx_thread[cpu]); + siw_tx_thread[cpu] = NULL; + pr_info("Creating TX thread for CPU %d failed", cpu); + continue; + } + kthread_bind(siw_tx_thread[cpu], cpu); + + wake_up_process(siw_tx_thread[cpu]); + assigned++; + } + return assigned; +} + +static int siw_dev_qualified(struct net_device *netdev) +{ + /* + * Additional hardware support can be added here + * (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see + * <linux/if_arp.h> for type identifiers. + */ + if (netdev->type == ARPHRD_ETHER || + netdev->type == ARPHRD_IEEE802 || + (netdev->type == ARPHRD_LOOPBACK && loopback_enabled)) + return 1; + + return 0; +} + +static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0)); + +static struct { + struct cpumask **tx_valid_cpus; + int num_nodes; +} siw_cpu_info; + +static int siw_init_cpulist(void) +{ + int i, num_nodes; + + num_nodes = num_possible_nodes(); + siw_cpu_info.num_nodes = num_nodes; + + siw_cpu_info.tx_valid_cpus = kcalloc(num_nodes, sizeof(void *), + GFP_KERNEL); + if (!siw_cpu_info.tx_valid_cpus) { + siw_cpu_info.num_nodes = 0; + return -ENOMEM; + } + + for (i = 0; i < siw_cpu_info.num_nodes; i++) { + siw_cpu_info.tx_valid_cpus[i] = kzalloc(sizeof(struct cpumask), + GFP_KERNEL); + if (!siw_cpu_info.tx_valid_cpus[i]) + goto out_err; + + cpumask_clear(siw_cpu_info.tx_valid_cpus[i]); + } + for_each_possible_cpu(i) + cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]); + + return 0; + +out_err: + siw_cpu_info.num_nodes = 0; + while (i) { + kfree(siw_cpu_info.tx_valid_cpus[i]); + siw_cpu_info.tx_valid_cpus[i--] = NULL; + } + kfree(siw_cpu_info.tx_valid_cpus); + siw_cpu_info.tx_valid_cpus = NULL; + + return -ENOMEM; +} + +static void siw_destroy_cpulist(void) +{ + int i = 0; + + while (i < siw_cpu_info.num_nodes) + kfree(siw_cpu_info.tx_valid_cpus[i++]); + + kfree(siw_cpu_info.tx_valid_cpus); +} + +/* + * Choose CPU with least number of active QP's from NUMA node of + * TX interface. + */ +int siw_get_tx_cpu(struct siw_device *sdev) +{ + const struct cpumask *tx_cpumask; + int i, num_cpus, cpu, min_use, + node = sdev->numa_node, + tx_cpu = -1; + + if (node < 0) + tx_cpumask = cpu_online_mask; + else + tx_cpumask = siw_cpu_info.tx_valid_cpus[node]; + + num_cpus = cpumask_weight(tx_cpumask); + if (!num_cpus) { + /* no CPU on this NUMA node */ + tx_cpumask = cpu_online_mask; + num_cpus = cpumask_weight(tx_cpumask); + } + if (!num_cpus) + goto out; + + cpu = cpumask_first(tx_cpumask); + + for (i = 0, min_use = SIW_MAX_QP; i < num_cpus; + i++, cpu = cpumask_next(cpu, tx_cpumask)) { + int usage; + + /* Skip any cores which have no TX thread */ + if (!siw_tx_thread[cpu]) + continue; + + usage = atomic_read(&per_cpu(use_cnt, cpu)); + if (usage <= min_use) { + tx_cpu = cpu; + min_use = usage; + } + } + siw_dbg(sdev, "tx cpu %d, node %d, %d qp's\n", + tx_cpu, node, min_use); + +out: + if (tx_cpu >= 0) + atomic_inc(&per_cpu(use_cnt, tx_cpu)); + else + pr_warn("siw: no tx cpu found\n"); + + return tx_cpu; +} + +void siw_put_tx_cpu(int cpu) +{ + atomic_dec(&per_cpu(use_cnt, cpu)); +} + +static void siw_verbs_sq_flush(struct ib_qp *base_qp) +{ + struct siw_qp *qp = siw_qp_base2siw(base_qp); + + down_write(&qp->state_lock); + siw_sq_flush(qp); + up_write(&qp->state_lock); +} + +static void siw_verbs_rq_flush(struct ib_qp *base_qp) +{ + struct siw_qp *qp = siw_qp_base2siw(base_qp); + + down_write(&qp->state_lock); + siw_rq_flush(qp); + up_write(&qp->state_lock); +} + +static struct ib_ah *siw_create_ah(struct ib_pd *pd, struct rdma_ah_attr *attr, + u32 flags, struct ib_udata *udata) +{ + return ERR_PTR(-EOPNOTSUPP); +} + +static int siw_destroy_ah(struct ib_ah *ah, u32 flags) +{ + return -EOPNOTSUPP; +} + +static void siw_unregistered(struct ib_device *base_dev) +{ + struct siw_device *sdev = siw_dev_base2siw(base_dev); + + siw_device_cleanup(sdev); + siw_device_destroy(sdev); +} + +static struct siw_device *siw_device_create(struct net_device *netdev) +{ + struct siw_device *sdev; + struct ib_device *base_dev; + struct device *parent = netdev->dev.parent; + + sdev = (struct siw_device *)ib_alloc_device(sizeof(*sdev)); + if (!sdev) + goto out; + + base_dev = &sdev->base_dev; + + base_dev->driver_unregister = siw_unregistered; + + if (!parent) { + /* + * The loopback device has no parent device, + * so it appears as a top-level device. To support + * loopback device connectivity, take this device + * as the parent device. Skip all other devices + * w/o parent device. + */ + if (netdev->type != ARPHRD_LOOPBACK) { + pr_warn("siw: device %s skipped (no parent dev)\n", + netdev->name); + ib_dealloc_device(base_dev); + sdev = NULL; + goto out; + } + parent = &netdev->dev; + } + base_dev->iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL); + if (!base_dev->iwcm) { + ib_dealloc_device(base_dev); + sdev = NULL; + goto out; + } + + sdev->netdev = netdev; + + memset(&base_dev->node_guid, 0, sizeof(base_dev->node_guid)); + + if (netdev->type != ARPHRD_LOOPBACK) { + memcpy(&base_dev->node_guid, netdev->dev_addr, 6); + } else { + /* + * The loopback device does not have a HW address, + * but connection mangagement lib expects gid != 0 + */ + size_t gidlen = min_t(size_t, strlen(base_dev->name), 6); + + memcpy(&base_dev->node_guid, base_dev->name, gidlen); + } + base_dev->owner = THIS_MODULE; + + base_dev->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_REG_MR) | + (1ull << IB_USER_VERBS_CMD_DEREG_MR) | + (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV); + + base_dev->node_type = RDMA_NODE_RNIC; + memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON, + sizeof(SIW_NODE_DESC_COMMON)); + + /* + * Current model (one-to-one device association): + * One Softiwarp device per net_device or, equivalently, + * per physical port. + */ + base_dev->phys_port_cnt = 1; + + base_dev->dev.parent = parent; + base_dev->dev.dma_ops = &dma_virt_ops; + + base_dev->num_comp_vectors = num_possible_cpus(); + base_dev->ops.query_device = siw_query_device; + base_dev->ops.query_port = siw_query_port; + base_dev->ops.get_port_immutable = siw_get_port_immutable; + base_dev->ops.get_netdev = siw_get_netdev; + base_dev->ops.query_qp = siw_query_qp; + base_dev->ops.modify_port = siw_modify_port; + base_dev->ops.query_pkey = siw_query_pkey; + base_dev->ops.query_gid = siw_query_gid; + base_dev->ops.alloc_ucontext = siw_alloc_ucontext; + base_dev->ops.dealloc_ucontext = siw_dealloc_ucontext; + base_dev->ops.mmap = siw_mmap; + base_dev->ops.alloc_pd = siw_alloc_pd; + base_dev->ops.dealloc_pd = siw_dealloc_pd; + base_dev->ops.create_ah = siw_create_ah; + base_dev->ops.destroy_ah = siw_destroy_ah; + base_dev->ops.create_qp = siw_create_qp; + base_dev->ops.modify_qp = siw_verbs_modify_qp; + base_dev->ops.destroy_qp = siw_destroy_qp; + base_dev->ops.create_cq = siw_create_cq; + base_dev->ops.destroy_cq = siw_destroy_cq; + base_dev->ops.resize_cq = NULL; + base_dev->ops.poll_cq = siw_poll_cq; + base_dev->ops.get_dma_mr = siw_get_dma_mr; + base_dev->ops.reg_user_mr = siw_reg_user_mr; + base_dev->ops.dereg_mr = siw_dereg_mr; + base_dev->ops.alloc_mr = siw_alloc_mr; + base_dev->ops.map_mr_sg = siw_map_mr_sg; + base_dev->ops.dealloc_mw = NULL; + + base_dev->ops.create_srq = siw_create_srq; + base_dev->ops.modify_srq = siw_modify_srq; + base_dev->ops.query_srq = siw_query_srq; + base_dev->ops.destroy_srq = siw_destroy_srq; + base_dev->ops.post_srq_recv = siw_post_srq_recv; + + base_dev->ops.attach_mcast = NULL; + base_dev->ops.detach_mcast = NULL; + base_dev->ops.process_mad = siw_no_mad; + + base_dev->ops.req_notify_cq = siw_req_notify_cq; + base_dev->ops.post_send = siw_post_send; + base_dev->ops.post_recv = siw_post_receive; + + base_dev->ops.drain_sq = siw_verbs_sq_flush; + base_dev->ops.drain_rq = siw_verbs_rq_flush; + + base_dev->iwcm->connect = siw_connect; + base_dev->iwcm->accept = siw_accept; + base_dev->iwcm->reject = siw_reject; + base_dev->iwcm->create_listen = siw_create_listen; + base_dev->iwcm->destroy_listen = siw_destroy_listen; + base_dev->iwcm->add_ref = siw_qp_get_ref; + base_dev->iwcm->rem_ref = siw_qp_put_ref; + base_dev->iwcm->get_qp = siw_get_base_qp; + + /* Disable TCP port mapper service */ + base_dev->iwcm->driver_flags = IW_F_NO_PORT_MAP; + + memcpy(base_dev->iwcm->ifname, netdev->name, + sizeof(base_dev->iwcm->ifname)); + + sdev->attrs.max_qp = SIW_MAX_QP; + sdev->attrs.max_qp_wr = SIW_MAX_QP_WR; + sdev->attrs.max_ord = SIW_MAX_ORD_QP; + sdev->attrs.max_ird = SIW_MAX_IRD_QP; + sdev->attrs.max_sge = SIW_MAX_SGE; + sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD; + sdev->attrs.max_cq = SIW_MAX_CQ; + sdev->attrs.max_cqe = SIW_MAX_CQE; + sdev->attrs.max_mr = SIW_MAX_MR; + sdev->attrs.max_pd = SIW_MAX_PD; + sdev->attrs.max_mw = SIW_MAX_MW; + sdev->attrs.max_fmr = SIW_MAX_FMR; + sdev->attrs.max_srq = SIW_MAX_SRQ; + sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR; + sdev->attrs.max_srq_sge = SIW_MAX_SGE; + + siw_idr_init(sdev); + INIT_LIST_HEAD(&sdev->cep_list); + INIT_LIST_HEAD(&sdev->qp_list); + INIT_LIST_HEAD(&sdev->mr_list); + + atomic_set(&sdev->num_ctx, 0); + atomic_set(&sdev->num_srq, 0); + atomic_set(&sdev->num_qp, 0); + atomic_set(&sdev->num_cq, 0); + atomic_set(&sdev->num_mr, 0); + atomic_set(&sdev->num_pd, 0); + atomic_set(&sdev->num_cep, 0); + + sdev->numa_node = dev_to_node(parent); +out: + if (sdev) + dev_hold(netdev); + + return sdev; +} + +static void siw_netdev_unregistered(struct work_struct *work) +{ + struct siw_device *sdev = container_of(work, struct siw_device, + netdev_unregister); + + struct siw_qp_attrs qp_attrs; + struct list_head *pos, *tmp; + + memset(&qp_attrs, 0, sizeof(qp_attrs)); + qp_attrs.state = SIW_QP_STATE_ERROR; + + /* + * Mark all current QP's of this device dead + */ + list_for_each_safe(pos, tmp, &sdev->qp_list) { + struct siw_qp *qp = list_entry(pos, struct siw_qp, devq); + + down_write(&qp->state_lock); + (void) siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE); + up_write(&qp->state_lock); + } + ib_unregister_device_and_put(&sdev->base_dev); +} + +static int siw_netdev_event(struct notifier_block *nb, unsigned long event, + void *arg) +{ + struct net_device *netdev = netdev_notifier_info_to_dev(arg); + struct siw_device *sdev; + + dev_dbg(&netdev->dev, "siw: event %lu\n", event); + + if (dev_net(netdev) != &init_net) + return NOTIFY_OK; + + sdev = siw_dev_from_netdev(netdev); + if (!sdev) + return NOTIFY_OK; + + switch (event) { + + case NETDEV_UP: + sdev->state = IB_PORT_ACTIVE; + siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE); + break; + + case NETDEV_DOWN: + sdev->state = IB_PORT_DOWN; + siw_port_event(sdev, 1, IB_EVENT_PORT_ERR); + break; + + case NETDEV_REGISTER: + /* + * Device registration now handled only by + * rdma netlink commands. So it shall be impossible + * to end up here with a valid siw device. + */ + siw_dbg(sdev, "unexpected NETDEV_REGISTER event\n"); + break; + + case NETDEV_UNREGISTER: + INIT_WORK(&sdev->netdev_unregister, siw_netdev_unregistered); + schedule_work(&sdev->netdev_unregister); + break; + + case NETDEV_CHANGEADDR: + siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE); + break; + /* + * Todo: Below netdev events are currently not handled. + */ + case NETDEV_CHANGEMTU: + case NETDEV_GOING_DOWN: + case NETDEV_CHANGE: + + break; + + default: + break; + } + ib_device_put(&sdev->base_dev); + + return NOTIFY_OK; +} + +static struct notifier_block siw_netdev_nb = { + .notifier_call = siw_netdev_event, +}; + +static int siw_newlink(const char *basedev_name, struct net_device *netdev) +{ + struct siw_device *sdev; + int rv; + + sdev = siw_dev_from_netdev(netdev); + if (sdev) { + ib_device_put(&sdev->base_dev); + rv = -EEXIST; + goto out; + } + if (!siw_dev_qualified(netdev)) { + rv = -EINVAL; + goto out; + } + sdev = siw_device_create(netdev); + if (sdev) { + dev_dbg(&netdev->dev, "siw: new device\n"); + + if (netif_running(netdev) && netif_carrier_ok(netdev)) + sdev->state = IB_PORT_ACTIVE; + else + sdev->state = IB_PORT_DOWN; + + rv = siw_device_register(sdev, basedev_name); + if (rv) { + siw_device_destroy(sdev); + ib_dealloc_device(&sdev->base_dev); + goto out; + } + } else { + rv = -ENOMEM; + } +out: + return rv; +} + +static struct rdma_link_ops siw_link_ops = { + .type = "siw", + .newlink = siw_newlink, +}; + +/* + * siw_init_module - Initialize Softiwarp module and register with netdev + * subsystem to create Softiwarp devices per net_device + */ +static __init int siw_init_module(void) +{ + int rv; + int nr_cpu; + + if (SENDPAGE_THRESH < SIW_MAX_INLINE) { + pr_info("siw: sendpage threshold too small: %u\n", + (int)SENDPAGE_THRESH); + rv = EINVAL; + goto out_error; + } + rv = siw_init_cpulist(); + if (rv) + goto out_error; + + rv = siw_cm_init(); + if (rv) + goto out_error; + + siw_debug_init(); + + /* + * Allocate CRC SHASH object. Fail loading siw only, if CRC is + * required by kernel module + */ + siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(siw_crypto_shash)) { + pr_info("siw: Loading CRC32c failed: %ld\n", + PTR_ERR(siw_crypto_shash)); + siw_crypto_shash = NULL; + if (mpa_crc_required == true) + goto out_error; + } + rv = register_netdevice_notifier(&siw_netdev_nb); + if (rv) { + siw_debugfs_delete(); + goto out_error; + } + for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) + siw_tx_thread[nr_cpu] = NULL; + + if (!siw_create_tx_threads()) { + pr_info("siw: Could not start any TX thread\n"); + unregister_netdevice_notifier(&siw_netdev_nb); + goto out_error; + } + rdma_link_register(&siw_link_ops); + + pr_info("SoftiWARP attached\n"); + return 0; + +out_error: + for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) { + if (siw_tx_thread[nr_cpu]) { + siw_stop_tx_thread(nr_cpu); + siw_tx_thread[nr_cpu] = NULL; + } + } + if (siw_crypto_shash) + crypto_free_shash(siw_crypto_shash); + + pr_info("SoftIWARP attach failed. Error: %d\n", rv); + + siw_cm_exit(); + siw_destroy_cpulist(); + + return rv; +} + +static void __exit siw_exit_module(void) +{ + int nr_cpu; + + for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) { + if (siw_tx_thread[nr_cpu]) { + siw_stop_tx_thread(nr_cpu); + siw_tx_thread[nr_cpu] = NULL; + } + } + unregister_netdevice_notifier(&siw_netdev_nb); + rdma_link_unregister(&siw_link_ops); + ib_unregister_driver(RDMA_DRIVER_SIW); + + siw_cm_exit(); + + if (siw_crypto_shash) + crypto_free_shash(siw_crypto_shash); + + siw_debugfs_delete(); + siw_destroy_cpulist(); + + pr_info("SoftiWARP detached\n"); +} + +module_init(siw_init_module); +module_exit(siw_exit_module); + +MODULE_ALIAS_RDMA_LINK("siw");

[v4,03/13] SIW network and RDMA core interface

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