Signed-off-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
---
drivers/infiniband/sw/siw/siw_main.c | 711 +++++++++++++++++++++++++++
1 file changed, 711 insertions(+)
create mode 100644 drivers/infiniband/sw/siw/siw_main.c
diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
new file mode 100644
index 000000000000..56d5c9ff4c5a
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_main.c
@@ -0,0 +1,711 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+
+/* Authors: Bernard Metzler <bmt@xxxxxxxxxxxxxx> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#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 <linux/kthread.h>
+
+#include "siw.h"
+#include "siw_cm.h"
+#include "siw_verbs.h"
+#include "siw_debug.h"
+
+MODULE_AUTHOR("Bernard Metzler");
+MODULE_DESCRIPTION("Software iWARP Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+/* 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 siw maximum bandwidth.
+ * gso_seg_limit = 0 makes use of GSO for large transfers.
+ */
+const u8 gso_seg_limit = 1;
+
+/* 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;
+
+/* Control TCP_NODELAY socket option */
+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 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;
+
+ rv = ib_register_device(base_dev, name);
+ if (rv) {
+ pr_warn("siw: device registration error %d\n", rv);
+ return rv;
+ }
+ sdev->vendor_part_id = dev_id++;
+
+ siw_dbg(sdev, "HWaddr=%pM\n", sdev->netdev->dev_addr);
+
+ return 0;
+}
+
+static void siw_device_cleanup(struct ib_device *base_dev)
+{
+ struct siw_device *sdev = to_siw_dev(base_dev);
+
+ siw_dbg(sdev, "Cleanup device\n");
+
+ 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);
+ }
+ idr_destroy(&sdev->qp_idr);
+ idr_destroy(&sdev->mem_idr);
+
+ kfree(sdev->base_dev.iwcm);
+}
+
+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 = to_siw_qp(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 = to_siw_qp(base_qp);
+
+ down_write(&qp->state_lock);
+ siw_rq_flush(qp);
+ up_write(&qp->state_lock);
+}
+
+static const struct ib_device_ops siw_device_ops = {
+ .alloc_mr = siw_alloc_mr,
+ .alloc_pd = siw_alloc_pd,
+ .alloc_ucontext = siw_alloc_ucontext,
+ .create_cq = siw_create_cq,
+ .create_qp = siw_create_qp,
+ .create_srq = siw_create_srq,
+ .dealloc_driver = siw_device_cleanup,
+ .dealloc_pd = siw_dealloc_pd,
+ .dealloc_ucontext = siw_dealloc_ucontext,
+ .dereg_mr = siw_dereg_mr,
+ .destroy_cq = siw_destroy_cq,
+ .destroy_qp = siw_destroy_qp,
+ .destroy_srq = siw_destroy_srq,
+ .drain_rq = siw_verbs_rq_flush,
+ .drain_sq = siw_verbs_sq_flush,
+ .get_dma_mr = siw_get_dma_mr,
+ .get_port_immutable = siw_get_port_immutable,
+ .map_mr_sg = siw_map_mr_sg,
+ .mmap = siw_mmap,
+ .modify_qp = siw_verbs_modify_qp,
+ .modify_srq = siw_modify_srq,
+ .poll_cq = siw_poll_cq,
+ .post_recv = siw_post_receive,
+ .post_send = siw_post_send,
+ .post_srq_recv = siw_post_srq_recv,
+ .query_device = siw_query_device,
+ .query_gid = siw_query_gid,
+ .query_pkey = siw_query_pkey,
+ .query_port = siw_query_port,
+ .query_qp = siw_query_qp,
+ .query_srq = siw_query_srq,
+ .req_notify_cq = siw_req_notify_cq,
+ .reg_user_mr = siw_reg_user_mr,
+
+ INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd),
+ INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext),
+};
+
+static struct siw_device *siw_device_create(struct net_device *netdev)
+{
+ struct siw_device *sdev = NULL;
+ struct ib_device *base_dev;
+ struct device *parent = netdev->dev.parent;
+ int rv;
+
+ 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 error: no parent device\n",
+ netdev->name);
+ return NULL;
+ }
+ parent = &netdev->dev;
+ }
+ sdev = ib_alloc_device(siw_device, base_dev);
+ if (!sdev)
+ return NULL;
+
+ base_dev = &sdev->base_dev;
+
+ base_dev->iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL);
+ if (!base_dev->iwcm)
+ goto error;
+
+ sdev->netdev = netdev;
+
+ 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_QUERY_DEVICE) |
+ (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
+ (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
+ (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_POST_SRQ_RECV) |
+ (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
+ (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
+ (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);
+
+ 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();
+
+ ib_set_device_ops(base_dev, &siw_device_ops);
+ rv = ib_device_set_netdev(base_dev, netdev, 1);
+ if (rv)
+ goto error;
+
+ base_dev->iwcm->accept = siw_accept;
+ base_dev->iwcm->add_ref = siw_qp_get_ref;
+ base_dev->iwcm->connect = siw_connect;
+ base_dev->iwcm->create_listen = siw_create_listen;
+ base_dev->iwcm->destroy_listen = siw_destroy_listen;
+ base_dev->iwcm->get_qp = siw_get_base_qp;
+ base_dev->iwcm->reject = siw_reject;
+ base_dev->iwcm->rem_ref = siw_qp_put_ref;
+
+ /* 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;
+
+ idr_init(&sdev->qp_idr);
+ idr_init(&sdev->mem_idr);
+
+ 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);
+ spin_lock_init(&sdev->lock);
+
+ return sdev;
+error:
+ kfree(base_dev->iwcm);
+ ib_dealloc_device(base_dev);
+
+ return NULL;
+}
+
+/*
+ * Network link becomes unavailable. Mark all
+ * affected QP's accordingly.
+ */
+static void siw_netdev_down(struct work_struct *work)
+{
+ struct siw_device *sdev =
+ container_of(work, struct siw_device, netdev_down);
+
+ 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;
+
+ 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);
+ WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE));
+ up_write(&qp->state_lock);
+ }
+ ib_device_put(&sdev->base_dev);
+}
+
+static void siw_device_goes_down(struct siw_device *sdev)
+{
+ if (ib_device_try_get(&sdev->base_dev)) {
+ INIT_WORK(&sdev->netdev_down, siw_netdev_down);
+ schedule_work(&sdev->netdev_down);
+ }
+}
+
+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 ib_device *base_dev;
+ struct siw_device *sdev;
+
+ dev_dbg(&netdev->dev, "siw: event %lu\n", event);
+
+ if (dev_net(netdev) != &init_net)
+ return NOTIFY_OK;
+
+ base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
+ if (!base_dev)
+ return NOTIFY_OK;
+
+ sdev = to_siw_dev(base_dev);
+
+ switch (event) {
+ case NETDEV_UP:
+ sdev->state = IB_PORT_ACTIVE;
+ siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE);
+ break;
+
+ case NETDEV_GOING_DOWN:
+ siw_device_goes_down(sdev);
+ 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:
+ ib_unregister_device_queued(&sdev->base_dev);
+ 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_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 ib_device *base_dev;
+ struct siw_device *sdev = NULL;
+ int rv = -ENOMEM;
+
+ if (!siw_dev_qualified(netdev))
+ return -EINVAL;
+
+ base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
+ if (base_dev) {
+ ib_device_put(base_dev);
+ return -EEXIST;
+ }
+ 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_cleanup(&sdev->base_dev);
+ ib_dealloc_device(&sdev->base_dev);
+ }
+ }
+ 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;
+
+ /*
+ * 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) {
+ rv = -EOPNOTSUPP;
+ goto out_error;
+ }
+ }
+ rv = register_netdevice_notifier(&siw_netdev_nb);
+ if (rv)
+ 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_destroy_cpulist();
+
+ pr_info("SoftiWARP detached\n");
+}
+
+module_init(siw_init_module);
+module_exit(siw_exit_module);
+
+MODULE_ALIAS_RDMA_LINK("siw");
--
2.17.2
