freebsd-skq/sys/dev/iser/iser_verbs.c

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/* $FreeBSD$ */
/*-
* Copyright (c) 2015, Mellanox Technologies, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "icl_iser.h"
static MALLOC_DEFINE(M_ISER_VERBS, "iser_verbs", "iser verbs backend");
static int iser_cq_poll_limit = 512;
static void
iser_cq_event_callback(struct ib_event *cause, void *context)
{
ISER_ERR("got cq event %d", cause->event);
}
static void
iser_qp_event_callback(struct ib_event *cause, void *context)
{
ISER_ERR("got qp event %d", cause->event);
}
static void
iser_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
ISER_ERR("async event %d on device %s port %d",
event->event, event->device->name,
event->element.port_num);
}
/**
* is_iser_tx_desc - Indicate if the completion wr_id
* is a TX descriptor or not.
* @iser_conn: iser connection
* @wr_id: completion WR identifier
*
* Since we cannot rely on wc opcode in FLUSH errors
* we must work around it by checking if the wr_id address
* falls in the iser connection rx_descs buffer. If so
* it is an RX descriptor, otherwize it is a TX.
*/
static inline bool
is_iser_tx_desc(struct iser_conn *iser_conn, void *wr_id)
{
void *start = iser_conn->rx_descs;
u64 len = iser_conn->num_rx_descs * sizeof(*iser_conn->rx_descs);
void *end = (void *)((uintptr_t)start + (uintptr_t)len);
if (start) {
if (wr_id >= start && wr_id < end)
return false;
} else {
return ((uintptr_t)wr_id != (uintptr_t)iser_conn->login_resp_buf);
}
return true;
}
/**
* iser_handle_comp_error() - Handle error completion
* @ib_conn: connection RDMA resources
* @wc: work completion
*
* Notes: Update post_recv_buf_count in case of recv error completion.
* For non-FLUSH error completion we should also notify iscsi layer that
* connection is failed (in case we passed bind stage).
*/
static void
iser_handle_comp_error(struct ib_conn *ib_conn,
struct ib_wc *wc)
{
void *wr_id = (void *)(uintptr_t)wc->wr_id;
struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
ib_conn);
if (is_iser_tx_desc(iser_conn, wr_id)) {
ISER_DBG("conn %p got send comp error", iser_conn);
} else {
ISER_DBG("conn %p got recv comp error", iser_conn);
ib_conn->post_recv_buf_count--;
}
if (wc->status != IB_WC_WR_FLUSH_ERR)
iser_conn->icl_conn.ic_error(&iser_conn->icl_conn);
}
/**
* iser_handle_wc - handle a single work completion
* @wc: work completion
*
* Soft-IRQ context, work completion can be either
* SEND or RECV, and can turn out successful or
* with error (or flush error).
*/
static void iser_handle_wc(struct ib_wc *wc)
{
struct ib_conn *ib_conn;
struct iser_tx_desc *tx_desc;
struct iser_rx_desc *rx_desc;
ib_conn = wc->qp->qp_context;
if (likely(wc->status == IB_WC_SUCCESS)) {
if (wc->opcode == IB_WC_RECV) {
rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
iser_rcv_completion(rx_desc, wc->byte_len,
ib_conn);
} else
if (wc->opcode == IB_WC_SEND) {
tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
iser_snd_completion(tx_desc, ib_conn);
} else {
ISER_ERR("Unknown wc opcode %d", wc->opcode);
}
} else {
struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
ib_conn);
if (wc->status != IB_WC_WR_FLUSH_ERR) {
ISER_ERR("conn %p wr id %llx status %d vend_err %x",
iser_conn, (unsigned long long)wc->wr_id,
wc->status, wc->vendor_err);
} else {
ISER_DBG("flush error: conn %p wr id %llx",
iser_conn, (unsigned long long)wc->wr_id);
}
if (wc->wr_id == ISER_BEACON_WRID) {
/* all flush errors were consumed */
mtx_lock(&ib_conn->beacon.flush_lock);
ISER_DBG("conn %p got ISER_BEACON_WRID", iser_conn);
cv_signal(&ib_conn->beacon.flush_cv);
mtx_unlock(&ib_conn->beacon.flush_lock);
} else {
iser_handle_comp_error(ib_conn, wc);
}
}
}
static void
iser_cq_tasklet_fn(void *data, int pending)
{
struct iser_comp *comp = (struct iser_comp *)data;
struct ib_cq *cq = comp->cq;
struct ib_wc *const wcs = comp->wcs;
int completed = 0;
int i;
int n;
while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
for (i = 0; i < n; i++)
iser_handle_wc(&wcs[i]);
completed += n;
if (completed >= iser_cq_poll_limit)
break;
}
/*
* It is assumed here that arming CQ only once its empty
* would not cause interrupts to be missed.
*/
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
}
static void
iser_cq_callback(struct ib_cq *cq, void *cq_context)
{
struct iser_comp *comp = cq_context;
taskqueue_enqueue(comp->tq, &comp->task);
}
/**
* iser_create_device_ib_res - creates Protection Domain (PD), Completion
* Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
* the adapator.
*
* returns 0 on success, -1 on failure
*/
static int
iser_create_device_ib_res(struct iser_device *device)
{
struct ib_device_attr *dev_attr = &device->dev_attr;
int ret, i, max_cqe;
ret = ib_query_device(device->ib_device, dev_attr);
if (ret) {
ISER_ERR("Query device failed for %s", device->ib_device->name);
return (ret);
}
if (!(dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) {
ISER_ERR("device %s doesn't support Fastreg, "
"can't register memory", device->ib_device->name);
return (1);
}
device->comps_used = min(mp_ncpus, device->ib_device->num_comp_vectors);
device->comps = malloc(device->comps_used * sizeof(*device->comps),
M_ISER_VERBS, M_WAITOK | M_ZERO);
if (!device->comps)
goto comps_err;
max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe);
ISER_DBG("using %d CQs, device %s supports %d vectors max_cqe %d",
device->comps_used, device->ib_device->name,
device->ib_device->num_comp_vectors, max_cqe);
device->pd = ib_alloc_pd(device->ib_device);
if (IS_ERR(device->pd))
goto pd_err;
for (i = 0; i < device->comps_used; i++) {
struct iser_comp *comp = &device->comps[i];
comp->device = device;
comp->cq = ib_create_cq(device->ib_device,
iser_cq_callback,
iser_cq_event_callback,
(void *)comp,
max_cqe, i);
if (IS_ERR(comp->cq)) {
comp->cq = NULL;
goto cq_err;
}
if (ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP))
goto cq_err;
TASK_INIT(&comp->task, 0, iser_cq_tasklet_fn, comp);
comp->tq = taskqueue_create_fast("iser_taskq", M_NOWAIT,
taskqueue_thread_enqueue, &comp->tq);
if (!comp->tq)
goto tq_err;
taskqueue_start_threads(&comp->tq, 1, PI_NET, "iser taskq");
}
device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ);
if (IS_ERR(device->mr))
goto tq_err;
INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device,
iser_event_handler);
if (ib_register_event_handler(&device->event_handler))
goto handler_err;
return (0);
handler_err:
ib_dereg_mr(device->mr);
tq_err:
for (i = 0; i < device->comps_used; i++) {
struct iser_comp *comp = &device->comps[i];
if (comp->tq)
taskqueue_free(comp->tq);
}
cq_err:
for (i = 0; i < device->comps_used; i++) {
struct iser_comp *comp = &device->comps[i];
if (comp->cq)
ib_destroy_cq(comp->cq);
}
ib_dealloc_pd(device->pd);
pd_err:
free(device->comps, M_ISER_VERBS);
comps_err:
ISER_ERR("failed to allocate an IB resource");
return (1);
}
/**
* iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
* CQ and PD created with the device associated with the adapator.
*/
static void
iser_free_device_ib_res(struct iser_device *device)
{
int i;
for (i = 0; i < device->comps_used; i++) {
struct iser_comp *comp = &device->comps[i];
taskqueue_free(comp->tq);
ib_destroy_cq(comp->cq);
comp->cq = NULL;
}
(void)ib_unregister_event_handler(&device->event_handler);
(void)ib_dereg_mr(device->mr);
(void)ib_dealloc_pd(device->pd);
free(device->comps, M_ISER_VERBS);
device->comps = NULL;
device->mr = NULL;
device->pd = NULL;
}
static int
iser_alloc_reg_res(struct ib_device *ib_device,
struct ib_pd *pd,
struct iser_reg_resources *res)
{
int ret;
res->frpl = ib_alloc_fast_reg_page_list(ib_device,
ISCSI_ISER_SG_TABLESIZE + 1);
if (IS_ERR(res->frpl)) {
ret = -PTR_ERR(res->frpl);
ISER_ERR("Failed to allocate fast reg page list err=%d", ret);
return (ret);
}
res->mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1);
if (IS_ERR(res->mr)) {
ret = -PTR_ERR(res->mr);
ISER_ERR("Failed to allocate fast reg mr err=%d", ret);
goto fast_reg_mr_failure;
}
res->mr_valid = 1;
return (0);
fast_reg_mr_failure:
ib_free_fast_reg_page_list(res->frpl);
return (ret);
}
static void
iser_free_reg_res(struct iser_reg_resources *rsc)
{
ib_dereg_mr(rsc->mr);
ib_free_fast_reg_page_list(rsc->frpl);
}
static struct fast_reg_descriptor *
iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd)
{
struct fast_reg_descriptor *desc;
int ret;
desc = malloc(sizeof(*desc), M_ISER_VERBS, M_WAITOK | M_ZERO);
if (!desc) {
ISER_ERR("Failed to allocate a new fastreg descriptor");
return (NULL);
}
ret = iser_alloc_reg_res(ib_device, pd, &desc->rsc);
if (ret) {
ISER_ERR("failed to allocate reg_resources");
goto err;
}
return (desc);
err:
free(desc, M_ISER_VERBS);
return (NULL);
}
/**
* iser_create_fmr_pool - Creates FMR pool and page_vector
*
* returns 0 on success, or errno code on failure
*/
int
iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max)
{
struct iser_device *device = ib_conn->device;
struct fast_reg_descriptor *desc;
int i;
INIT_LIST_HEAD(&ib_conn->fastreg.pool);
ib_conn->fastreg.pool_size = 0;
for (i = 0; i < cmds_max; i++) {
desc = iser_create_fastreg_desc(device->ib_device, device->pd);
if (!desc) {
ISER_ERR("Failed to create fastreg descriptor");
goto err;
}
list_add_tail(&desc->list, &ib_conn->fastreg.pool);
ib_conn->fastreg.pool_size++;
}
return (0);
err:
iser_free_fastreg_pool(ib_conn);
return (ENOMEM);
}
/**
* iser_free_fmr_pool - releases the FMR pool and page vec
*/
void
iser_free_fastreg_pool(struct ib_conn *ib_conn)
{
struct fast_reg_descriptor *desc, *tmp;
int i = 0;
if (list_empty(&ib_conn->fastreg.pool))
return;
ISER_DBG("freeing conn %p fr pool", ib_conn);
list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) {
list_del(&desc->list);
iser_free_reg_res(&desc->rsc);
free(desc, M_ISER_VERBS);
++i;
}
if (i < ib_conn->fastreg.pool_size)
ISER_WARN("pool still has %d regions registered",
ib_conn->fastreg.pool_size - i);
}
/**
* iser_create_ib_conn_res - Queue-Pair (QP)
*
* returns 0 on success, 1 on failure
*/
static int
iser_create_ib_conn_res(struct ib_conn *ib_conn)
{
struct iser_conn *iser_conn;
struct iser_device *device;
struct ib_device_attr *dev_attr;
struct ib_qp_init_attr init_attr;
int index, min_index = 0;
int ret = -ENOMEM;
iser_conn = container_of(ib_conn, struct iser_conn, ib_conn);
device = ib_conn->device;
dev_attr = &device->dev_attr;
mtx_lock(&ig.connlist_mutex);
/* select the CQ with the minimal number of usages */
for (index = 0; index < device->comps_used; index++) {
if (device->comps[index].active_qps <
device->comps[min_index].active_qps)
min_index = index;
}
ib_conn->comp = &device->comps[min_index];
ib_conn->comp->active_qps++;
mtx_unlock(&ig.connlist_mutex);
ISER_INFO("cq index %d used for ib_conn %p", min_index, ib_conn);
memset(&init_attr, 0, sizeof init_attr);
init_attr.event_handler = iser_qp_event_callback;
init_attr.qp_context = (void *)ib_conn;
init_attr.send_cq = ib_conn->comp->cq;
init_attr.recv_cq = ib_conn->comp->cq;
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
init_attr.cap.max_send_sge = 2;
init_attr.cap.max_recv_sge = 1;
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
init_attr.qp_type = IB_QPT_RC;
if (dev_attr->max_qp_wr > ISER_QP_MAX_REQ_DTOS) {
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
iser_conn->max_cmds =
ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS);
} else {
init_attr.cap.max_send_wr = dev_attr->max_qp_wr;
iser_conn->max_cmds =
ISER_GET_MAX_XMIT_CMDS(dev_attr->max_qp_wr);
}
ISER_DBG("device %s supports max_send_wr %d",
device->ib_device->name, dev_attr->max_qp_wr);
ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
if (ret)
goto out_err;
ib_conn->qp = ib_conn->cma_id->qp;
ISER_DBG("setting conn %p cma_id %p qp %p",
ib_conn, ib_conn->cma_id,
ib_conn->cma_id->qp);
return (ret);
out_err:
mtx_lock(&ig.connlist_mutex);
ib_conn->comp->active_qps--;
mtx_unlock(&ig.connlist_mutex);
ISER_ERR("unable to alloc mem or create resource, err %d", ret);
return (ret);
}
/**
* based on the resolved device node GUID see if there already allocated
* device for this device. If there's no such, create one.
*/
static struct iser_device *
iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
{
struct iser_device *device;
sx_xlock(&ig.device_list_mutex);
list_for_each_entry(device, &ig.device_list, ig_list)
/* find if there's a match using the node GUID */
if (device->ib_device->node_guid == cma_id->device->node_guid)
goto inc_refcnt;
device = malloc(sizeof *device, M_ISER_VERBS, M_WAITOK | M_ZERO);
if (device == NULL)
goto out;
/* assign this device to the device */
device->ib_device = cma_id->device;
/* init the device and link it into ig device list */
if (iser_create_device_ib_res(device)) {
free(device, M_ISER_VERBS);
device = NULL;
goto out;
}
list_add(&device->ig_list, &ig.device_list);
inc_refcnt:
device->refcount++;
ISER_INFO("device %p refcount %d", device, device->refcount);
out:
sx_xunlock(&ig.device_list_mutex);
return (device);
}
/* if there's no demand for this device, release it */
static void
iser_device_try_release(struct iser_device *device)
{
sx_xlock(&ig.device_list_mutex);
device->refcount--;
ISER_INFO("device %p refcount %d", device, device->refcount);
if (!device->refcount) {
iser_free_device_ib_res(device);
list_del(&device->ig_list);
free(device, M_ISER_VERBS);
device = NULL;
}
sx_xunlock(&ig.device_list_mutex);
}
/**
* Called with state mutex held
**/
static int iser_conn_state_comp_exch(struct iser_conn *iser_conn,
enum iser_conn_state comp,
enum iser_conn_state exch)
{
int ret;
ret = (iser_conn->state == comp);
if (ret)
iser_conn->state = exch;
return ret;
}
/**
* iser_free_ib_conn_res - release IB related resources
* @iser_conn: iser connection struct
* @destroy: indicator if we need to try to release the
* iser device and memory regoins pool (only iscsi
* shutdown and DEVICE_REMOVAL will use this).
*
* This routine is called with the iser state mutex held
* so the cm_id removal is out of here. It is Safe to
* be invoked multiple times.
*/
void
iser_free_ib_conn_res(struct iser_conn *iser_conn,
bool destroy)
{
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct iser_device *device = ib_conn->device;
ISER_INFO("freeing conn %p cma_id %p qp %p",
iser_conn, ib_conn->cma_id, ib_conn->qp);
if (ib_conn->qp != NULL) {
mtx_lock(&ig.connlist_mutex);
ib_conn->comp->active_qps--;
mtx_unlock(&ig.connlist_mutex);
rdma_destroy_qp(ib_conn->cma_id);
ib_conn->qp = NULL;
}
if (destroy) {
if (iser_conn->login_buf)
iser_free_login_buf(iser_conn);
if (iser_conn->rx_descs)
iser_free_rx_descriptors(iser_conn);
if (device != NULL) {
iser_device_try_release(device);
ib_conn->device = NULL;
}
}
}
/**
* triggers start of the disconnect procedures and wait for them to be done
* Called with state mutex held
*/
int
iser_conn_terminate(struct iser_conn *iser_conn)
{
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct ib_send_wr *bad_send_wr;
struct ib_recv_wr *bad_recv_wr;
int err = 0;
/* terminate the iser conn only if the conn state is UP */
if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP,
ISER_CONN_TERMINATING))
return (0);
ISER_INFO("iser_conn %p state %d\n", iser_conn, iser_conn->state);
if (ib_conn->qp == NULL) {
/* HOW can this be??? */
ISER_WARN("qp wasn't created");
return (1);
}
/*
* Todo: This is a temporary workaround.
* We serialize the connection closure using global lock in order to
* receive all posted beacons completions.
* Without Serialization, in case we open many connections (QPs) on
* the same CQ, we might miss beacons because of missing interrupts.
*/
sx_xlock(&ig.close_conns_mutex);
/*
* In case we didn't already clean up the cma_id (peer initiated
* a disconnection), we need to Cause the CMA to change the QP
* state to ERROR.
*/
if (ib_conn->cma_id) {
err = rdma_disconnect(ib_conn->cma_id);
if (err)
ISER_ERR("Failed to disconnect, conn: 0x%p err %d",
iser_conn, err);
mtx_lock(&ib_conn->beacon.flush_lock);
memset(&ib_conn->beacon.send, 0, sizeof(struct ib_send_wr));
ib_conn->beacon.send.wr_id = ISER_BEACON_WRID;
ib_conn->beacon.send.opcode = IB_WR_SEND;
/* post an indication that all send flush errors were consumed */
err = ib_post_send(ib_conn->qp, &ib_conn->beacon.send, &bad_send_wr);
if (err) {
ISER_ERR("conn %p failed to post send_beacon", ib_conn);
mtx_unlock(&ib_conn->beacon.flush_lock);
goto out;
}
ISER_DBG("before send cv_wait: %p", iser_conn);
cv_wait(&ib_conn->beacon.flush_cv, &ib_conn->beacon.flush_lock);
ISER_DBG("after send cv_wait: %p", iser_conn);
memset(&ib_conn->beacon.recv, 0, sizeof(struct ib_recv_wr));
ib_conn->beacon.recv.wr_id = ISER_BEACON_WRID;
/* post an indication that all recv flush errors were consumed */
err = ib_post_recv(ib_conn->qp, &ib_conn->beacon.recv, &bad_recv_wr);
if (err) {
ISER_ERR("conn %p failed to post recv_beacon", ib_conn);
mtx_unlock(&ib_conn->beacon.flush_lock);
goto out;
}
ISER_DBG("before recv cv_wait: %p", iser_conn);
cv_wait(&ib_conn->beacon.flush_cv, &ib_conn->beacon.flush_lock);
mtx_unlock(&ib_conn->beacon.flush_lock);
ISER_DBG("after recv cv_wait: %p", iser_conn);
}
out:
sx_xunlock(&ig.close_conns_mutex);
return (1);
}
/**
* Called with state mutex held
**/
static void
iser_connect_error(struct rdma_cm_id *cma_id)
{
struct iser_conn *iser_conn;
iser_conn = cma_id->context;
ISER_ERR("conn %p", iser_conn);
iser_conn->state = ISER_CONN_TERMINATING;
cv_signal(&iser_conn->up_cv);
}
/**
* Called with state mutex held
**/
static void
iser_addr_handler(struct rdma_cm_id *cma_id)
{
struct iser_device *device;
struct iser_conn *iser_conn;
struct ib_conn *ib_conn;
int ret;
iser_conn = cma_id->context;
ib_conn = &iser_conn->ib_conn;
device = iser_device_find_by_ib_device(cma_id);
if (!device) {
ISER_ERR("conn %p device lookup/creation failed",
iser_conn);
iser_connect_error(cma_id);
return;
}
ib_conn->device = device;
ret = rdma_resolve_route(cma_id, 1000);
if (ret) {
ISER_ERR("conn %p resolve route failed: %d", iser_conn, ret);
iser_connect_error(cma_id);
return;
}
}
/**
* Called with state mutex held
**/
static void
iser_route_handler(struct rdma_cm_id *cma_id)
{
struct rdma_conn_param conn_param;
int ret;
struct iser_cm_hdr req_hdr;
struct iser_conn *iser_conn = cma_id->context;
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct iser_device *device = ib_conn->device;
ret = iser_create_ib_conn_res(ib_conn);
if (ret)
goto failure;
memset(&conn_param, 0, sizeof conn_param);
conn_param.responder_resources = device->dev_attr.max_qp_rd_atom;
conn_param.retry_count = 7;
conn_param.rnr_retry_count = 6;
/*
* Initiaotr depth should not be set, but in order to compat
* with old targets, we keep this value set.
*/
conn_param.initiator_depth = 1;
memset(&req_hdr, 0, sizeof(req_hdr));
req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED |
ISER_SEND_W_INV_NOT_SUPPORTED);
conn_param.private_data = (void *)&req_hdr;
conn_param.private_data_len = sizeof(struct iser_cm_hdr);
ret = rdma_connect(cma_id, &conn_param);
if (ret) {
ISER_ERR("conn %p failure connecting: %d", iser_conn, ret);
goto failure;
}
return;
failure:
iser_connect_error(cma_id);
}
/**
* Called with state mutex held
**/
static void
iser_connected_handler(struct rdma_cm_id *cma_id)
{
struct iser_conn *iser_conn;
struct ib_qp_attr attr;
struct ib_qp_init_attr init_attr;
iser_conn = cma_id->context;
(void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
ISER_INFO("remote qpn:%x my qpn:%x",
attr.dest_qp_num, cma_id->qp->qp_num);
iser_conn->state = ISER_CONN_UP;
cv_signal(&iser_conn->up_cv);
}
/**
* Called with state mutex held
**/
static void
iser_cleanup_handler(struct rdma_cm_id *cma_id, bool destroy)
{
struct iser_conn *iser_conn = cma_id->context;
if (iser_conn_terminate(iser_conn))
iser_conn->icl_conn.ic_error(&iser_conn->icl_conn);
}
int
iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
{
struct iser_conn *iser_conn;
int ret = 0;
iser_conn = cma_id->context;
ISER_INFO("event %d status %d conn %p id %p",
event->event, event->status, cma_id->context, cma_id);
sx_xlock(&iser_conn->state_mutex);
switch (event->event) {
case RDMA_CM_EVENT_ADDR_RESOLVED:
iser_addr_handler(cma_id);
break;
case RDMA_CM_EVENT_ROUTE_RESOLVED:
iser_route_handler(cma_id);
break;
case RDMA_CM_EVENT_ESTABLISHED:
iser_connected_handler(cma_id);
break;
case RDMA_CM_EVENT_ADDR_ERROR:
case RDMA_CM_EVENT_ROUTE_ERROR:
case RDMA_CM_EVENT_CONNECT_ERROR:
case RDMA_CM_EVENT_UNREACHABLE:
case RDMA_CM_EVENT_REJECTED:
iser_connect_error(cma_id);
break;
case RDMA_CM_EVENT_DISCONNECTED:
case RDMA_CM_EVENT_ADDR_CHANGE:
case RDMA_CM_EVENT_TIMEWAIT_EXIT:
iser_cleanup_handler(cma_id, false);
break;
default:
ISER_ERR("Unexpected RDMA CM event (%d)", event->event);
break;
}
sx_xunlock(&iser_conn->state_mutex);
return (ret);
}
int
iser_post_recvl(struct iser_conn *iser_conn)
{
struct ib_recv_wr rx_wr, *rx_wr_failed;
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct ib_sge sge;
int ib_ret;
sge.addr = iser_conn->login_resp_dma;
sge.length = ISER_RX_LOGIN_SIZE;
sge.lkey = ib_conn->device->mr->lkey;
rx_wr.wr_id = (uintptr_t)iser_conn->login_resp_buf;
rx_wr.sg_list = &sge;
rx_wr.num_sge = 1;
rx_wr.next = NULL;
ib_conn->post_recv_buf_count++;
ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
if (ib_ret) {
ISER_ERR("ib_post_recv failed ret=%d", ib_ret);
ib_conn->post_recv_buf_count--;
}
return (ib_ret);
}
int
iser_post_recvm(struct iser_conn *iser_conn, int count)
{
struct ib_recv_wr *rx_wr, *rx_wr_failed;
int i, ib_ret;
struct ib_conn *ib_conn = &iser_conn->ib_conn;
unsigned int my_rx_head = iser_conn->rx_desc_head;
struct iser_rx_desc *rx_desc;
for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
rx_desc = &iser_conn->rx_descs[my_rx_head];
rx_wr->wr_id = (uintptr_t)rx_desc;
rx_wr->sg_list = &rx_desc->rx_sg;
rx_wr->num_sge = 1;
rx_wr->next = rx_wr + 1;
my_rx_head = (my_rx_head + 1) % iser_conn->qp_max_recv_dtos;
}
rx_wr--;
rx_wr->next = NULL; /* mark end of work requests list */
ib_conn->post_recv_buf_count += count;
ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
if (ib_ret) {
ISER_ERR("ib_post_recv failed ret=%d", ib_ret);
ib_conn->post_recv_buf_count -= count;
} else
iser_conn->rx_desc_head = my_rx_head;
return (ib_ret);
}
/**
* iser_start_send - Initiate a Send DTO operation
*
* returns 0 on success, -1 on failure
*/
int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
bool signal)
{
int ib_ret;
struct ib_send_wr send_wr, *send_wr_failed;
ib_dma_sync_single_for_device(ib_conn->device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN,
DMA_TO_DEVICE);
send_wr.next = NULL;
send_wr.wr_id = (uintptr_t)tx_desc;
send_wr.sg_list = tx_desc->tx_sg;
send_wr.num_sge = tx_desc->num_sge;
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0;
ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
if (ib_ret)
ISER_ERR("ib_post_send failed, ret:%d", ib_ret);
return (ib_ret);
}