freebsd-dev/sys/dev/iser/icl_iser.c
Edward Tomasz Napierala 4686f1a660 Fix crash on removal of an unconnected iSER session.
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
2016-05-26 11:40:07 +00:00

565 lines
15 KiB
C

/* $FreeBSD$ */
/*-
* 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"
SYSCTL_NODE(_kern, OID_AUTO, iser, CTLFLAG_RW, 0, "iSER module");
int iser_debug = 0;
SYSCTL_INT(_kern_iser, OID_AUTO, debug, CTLFLAG_RWTUN,
&iser_debug, 0, "Enable iser debug messages");
static MALLOC_DEFINE(M_ICL_ISER, "icl_iser", "iSCSI iser backend");
static uma_zone_t icl_pdu_zone;
static volatile u_int icl_iser_ncons;
struct iser_global ig;
static void iser_conn_release(struct icl_conn *ic);
static icl_conn_new_pdu_t iser_conn_new_pdu;
static icl_conn_pdu_free_t iser_conn_pdu_free;
static icl_conn_pdu_data_segment_length_t iser_conn_pdu_data_segment_length;
static icl_conn_pdu_append_data_t iser_conn_pdu_append_data;
static icl_conn_pdu_queue_t iser_conn_pdu_queue;
static icl_conn_handoff_t iser_conn_handoff;
static icl_conn_free_t iser_conn_free;
static icl_conn_close_t iser_conn_close;
static icl_conn_connect_t iser_conn_connect;
static icl_conn_task_setup_t iser_conn_task_setup;
static icl_conn_task_done_t iser_conn_task_done;
static icl_conn_pdu_get_data_t iser_conn_pdu_get_data;
static kobj_method_t icl_iser_methods[] = {
KOBJMETHOD(icl_conn_new_pdu, iser_conn_new_pdu),
KOBJMETHOD(icl_conn_pdu_free, iser_conn_pdu_free),
KOBJMETHOD(icl_conn_pdu_data_segment_length, iser_conn_pdu_data_segment_length),
KOBJMETHOD(icl_conn_pdu_append_data, iser_conn_pdu_append_data),
KOBJMETHOD(icl_conn_pdu_queue, iser_conn_pdu_queue),
KOBJMETHOD(icl_conn_handoff, iser_conn_handoff),
KOBJMETHOD(icl_conn_free, iser_conn_free),
KOBJMETHOD(icl_conn_close, iser_conn_close),
KOBJMETHOD(icl_conn_connect, iser_conn_connect),
KOBJMETHOD(icl_conn_task_setup, iser_conn_task_setup),
KOBJMETHOD(icl_conn_task_done, iser_conn_task_done),
KOBJMETHOD(icl_conn_pdu_get_data, iser_conn_pdu_get_data),
{ 0, 0 }
};
DEFINE_CLASS(icl_iser, icl_iser_methods, sizeof(struct iser_conn));
/**
* iser_initialize_headers() - Initialize task headers
* @pdu: iser pdu
* @iser_conn: iser connection
*
* Notes:
* This routine may race with iser teardown flow for scsi
* error handling TMFs. So for TMF we should acquire the
* state mutex to avoid dereferencing the IB device which
* may have already been terminated (racing teardown sequence).
*/
int
iser_initialize_headers(struct icl_iser_pdu *pdu, struct iser_conn *iser_conn)
{
struct iser_tx_desc *tx_desc = &pdu->desc;
struct iser_device *device = iser_conn->ib_conn.device;
u64 dma_addr;
int ret = 0;
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
ret = -ENOMEM;
goto out;
}
tx_desc->mapped = true;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
tx_desc->tx_sg[0].lkey = device->mr->lkey;
out:
return (ret);
}
int
iser_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *request,
const void *addr, size_t len, int flags)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
if (request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_LOGIN_REQUEST ||
request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_TEXT_REQUEST) {
ISER_DBG("copy to login buff");
memcpy(iser_conn->login_req_buf, addr, len);
request->ip_data_len = len;
}
return (0);
}
void
iser_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip,
size_t off, void *addr, size_t len)
{
/* If we have a receive data, copy it to upper layer buffer */
if (ip->ip_data_mbuf)
memcpy(addr, ip->ip_data_mbuf + off, len);
}
/*
* Allocate icl_pdu with empty BHS to fill up by the caller.
*/
struct icl_pdu *
iser_new_pdu(struct icl_conn *ic, int flags)
{
struct icl_iser_pdu *iser_pdu;
struct icl_pdu *ip;
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
iser_pdu = uma_zalloc(icl_pdu_zone, flags | M_ZERO);
if (iser_pdu == NULL) {
ISER_WARN("failed to allocate %zd bytes", sizeof(*iser_pdu));
return (NULL);
}
iser_pdu->iser_conn = iser_conn;
ip = &iser_pdu->icl_pdu;
ip->ip_conn = ic;
ip->ip_bhs = &iser_pdu->desc.iscsi_header;
return (ip);
}
struct icl_pdu *
iser_conn_new_pdu(struct icl_conn *ic, int flags)
{
return (iser_new_pdu(ic, flags));
}
void
iser_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
{
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
uma_zfree(icl_pdu_zone, iser_pdu);
}
size_t
iser_conn_pdu_data_segment_length(struct icl_conn *ic,
const struct icl_pdu *request)
{
uint32_t len = 0;
len += request->ip_bhs->bhs_data_segment_len[0];
len <<= 8;
len += request->ip_bhs->bhs_data_segment_len[1];
len <<= 8;
len += request->ip_bhs->bhs_data_segment_len[2];
return (len);
}
void
iser_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
{
iser_pdu_free(ic, ip);
}
static bool
is_control_opcode(uint8_t opcode)
{
bool is_control = false;
switch (opcode & ISCSI_OPCODE_MASK) {
case ISCSI_BHS_OPCODE_NOP_OUT:
case ISCSI_BHS_OPCODE_LOGIN_REQUEST:
case ISCSI_BHS_OPCODE_LOGOUT_REQUEST:
case ISCSI_BHS_OPCODE_TEXT_REQUEST:
is_control = true;
break;
case ISCSI_BHS_OPCODE_SCSI_COMMAND:
is_control = false;
break;
default:
ISER_ERR("unknown opcode %d", opcode);
}
return (is_control);
}
void
iser_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
int ret;
if (iser_conn->state != ISER_CONN_UP)
return;
ret = iser_initialize_headers(iser_pdu, iser_conn);
if (ret) {
ISER_ERR("Failed to map TX descriptor pdu %p", iser_pdu);
return;
}
if (is_control_opcode(ip->ip_bhs->bhs_opcode)) {
ret = iser_send_control(iser_conn, iser_pdu);
if (unlikely(ret))
ISER_ERR("Failed to send control pdu %p", iser_pdu);
} else {
ret = iser_send_command(iser_conn, iser_pdu);
if (unlikely(ret))
ISER_ERR("Failed to send command pdu %p", iser_pdu);
}
}
static struct icl_conn *
iser_new_conn(const char *name, struct mtx *lock)
{
struct iser_conn *iser_conn;
struct icl_conn *ic;
refcount_acquire(&icl_iser_ncons);
iser_conn = (struct iser_conn *)kobj_create(&icl_iser_class, M_ICL_ISER, M_WAITOK | M_ZERO);
if (!iser_conn) {
ISER_ERR("failed to allocate iser conn");
refcount_release(&icl_iser_ncons);
return (NULL);
}
cv_init(&iser_conn->up_cv, "iser_cv");
sx_init(&iser_conn->state_mutex, "iser_conn_state_mutex");
mtx_init(&iser_conn->ib_conn.beacon.flush_lock, "flush_lock", NULL, MTX_DEF);
cv_init(&iser_conn->ib_conn.beacon.flush_cv, "flush_cv");
mtx_init(&iser_conn->ib_conn.lock, "lock", NULL, MTX_DEF);
ic = &iser_conn->icl_conn;
ic->ic_lock = lock;
ic->ic_name = name;
ic->ic_offload = strdup("iser", M_TEMP);
ic->ic_iser = true;
ic->ic_unmapped = true;
return (ic);
}
void
iser_conn_free(struct icl_conn *ic)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
iser_conn_release(ic);
cv_destroy(&iser_conn->ib_conn.beacon.flush_cv);
mtx_destroy(&iser_conn->ib_conn.beacon.flush_lock);
sx_destroy(&iser_conn->state_mutex);
cv_destroy(&iser_conn->up_cv);
kobj_delete((struct kobj *)iser_conn, M_ICL_ISER);
refcount_release(&icl_iser_ncons);
}
int
iser_conn_handoff(struct icl_conn *ic, int fd)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
int error = 0;
sx_xlock(&iser_conn->state_mutex);
if (iser_conn->state != ISER_CONN_UP) {
error = EINVAL;
ISER_ERR("iser_conn %p state is %d, teardown started\n",
iser_conn, iser_conn->state);
goto out;
}
error = iser_alloc_rx_descriptors(iser_conn, ic->ic_maxtags);
if (error)
goto out;
error = iser_post_recvm(iser_conn, iser_conn->min_posted_rx);
if (error)
goto post_error;
iser_conn->handoff_done = true;
sx_xunlock(&iser_conn->state_mutex);
return (error);
post_error:
iser_free_rx_descriptors(iser_conn);
out:
sx_xunlock(&iser_conn->state_mutex);
return (error);
}
/**
* Frees all conn objects
*/
static void
iser_conn_release(struct icl_conn *ic)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct iser_conn *curr, *tmp;
mtx_lock(&ig.connlist_mutex);
/*
* Search for iser connection in global list.
* It may not be there in case of failure in connection establishment
* stage.
*/
list_for_each_entry_safe(curr, tmp, &ig.connlist, conn_list) {
if (iser_conn == curr) {
ISER_WARN("found iser_conn %p", iser_conn);
list_del(&iser_conn->conn_list);
}
}
mtx_unlock(&ig.connlist_mutex);
/*
* In case we reconnecting or removing session, we need to
* release IB resources (which is safe to call more than once).
*/
sx_xlock(&iser_conn->state_mutex);
iser_free_ib_conn_res(iser_conn, true);
sx_xunlock(&iser_conn->state_mutex);
if (ib_conn->cma_id != NULL) {
rdma_destroy_id(ib_conn->cma_id);
ib_conn->cma_id = NULL;
}
}
void
iser_conn_close(struct icl_conn *ic)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
ISER_INFO("closing conn %p", iser_conn);
sx_xlock(&iser_conn->state_mutex);
/*
* In case iser connection is waiting on conditional variable
* (state PENDING) and we try to close it before connection establishment,
* we need to signal it to continue releasing connection properly.
*/
if (!iser_conn_terminate(iser_conn) && iser_conn->state == ISER_CONN_PENDING)
cv_signal(&iser_conn->up_cv);
sx_xunlock(&iser_conn->state_mutex);
}
int
iser_conn_connect(struct icl_conn *ic, int domain, int socktype,
int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
{
struct iser_conn *iser_conn = icl_to_iser_conn(ic);
struct ib_conn *ib_conn = &iser_conn->ib_conn;
int err = 0;
iser_conn_release(ic);
sx_xlock(&iser_conn->state_mutex);
/* the device is known only --after-- address resolution */
ib_conn->device = NULL;
iser_conn->handoff_done = false;
iser_conn->state = ISER_CONN_PENDING;
ib_conn->cma_id = rdma_create_id(iser_cma_handler, (void *)iser_conn,
RDMA_PS_TCP, IB_QPT_RC);
if (IS_ERR(ib_conn->cma_id)) {
err = -PTR_ERR(ib_conn->cma_id);
ISER_ERR("rdma_create_id failed: %d", err);
goto id_failure;
}
err = rdma_resolve_addr(ib_conn->cma_id, from_sa, to_sa, 1000);
if (err) {
ISER_ERR("rdma_resolve_addr failed: %d", err);
if (err < 0)
err = -err;
goto addr_failure;
}
ISER_DBG("before cv_wait: %p", iser_conn);
cv_wait(&iser_conn->up_cv, &iser_conn->state_mutex);
ISER_DBG("after cv_wait: %p", iser_conn);
if (iser_conn->state != ISER_CONN_UP) {
err = EIO;
goto addr_failure;
}
err = iser_alloc_login_buf(iser_conn);
if (err)
goto addr_failure;
sx_xunlock(&iser_conn->state_mutex);
mtx_lock(&ig.connlist_mutex);
list_add(&iser_conn->conn_list, &ig.connlist);
mtx_unlock(&ig.connlist_mutex);
return (0);
id_failure:
ib_conn->cma_id = NULL;
addr_failure:
sx_xunlock(&iser_conn->state_mutex);
return (err);
}
int
iser_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip,
struct ccb_scsiio *csio,
uint32_t *task_tagp, void **prvp)
{
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
*prvp = ip;
iser_pdu->csio = csio;
return (0);
}
void
iser_conn_task_done(struct icl_conn *ic, void *prv)
{
struct icl_pdu *ip = prv;
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
struct iser_device *device = iser_pdu->iser_conn->ib_conn.device;
struct iser_tx_desc *tx_desc = &iser_pdu->desc;
if (iser_pdu->dir[ISER_DIR_IN]) {
iser_unreg_rdma_mem(iser_pdu, ISER_DIR_IN);
iser_dma_unmap_task_data(iser_pdu,
&iser_pdu->data[ISER_DIR_IN],
DMA_FROM_DEVICE);
}
if (iser_pdu->dir[ISER_DIR_OUT]) {
iser_unreg_rdma_mem(iser_pdu, ISER_DIR_OUT);
iser_dma_unmap_task_data(iser_pdu,
&iser_pdu->data[ISER_DIR_OUT],
DMA_TO_DEVICE);
}
if (likely(tx_desc->mapped)) {
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
tx_desc->mapped = false;
}
iser_pdu_free(ic, ip);
}
static int
iser_limits(size_t *limitp)
{
*limitp = 128 * 1024;
return (0);
}
static int
icl_iser_load(void)
{
int error;
ISER_DBG("Starting iSER datamover...");
icl_pdu_zone = uma_zcreate("icl_iser_pdu", sizeof(struct icl_iser_pdu),
NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
/* FIXME: Check rc */
refcount_init(&icl_iser_ncons, 0);
error = icl_register("iser", true, 0, iser_limits, iser_new_conn);
KASSERT(error == 0, ("failed to register iser"));
memset(&ig, 0, sizeof(struct iser_global));
/* device init is called only after the first addr resolution */
sx_init(&ig.device_list_mutex, "global_device_lock");
INIT_LIST_HEAD(&ig.device_list);
mtx_init(&ig.connlist_mutex, "global_conn_lock", NULL, MTX_DEF);
INIT_LIST_HEAD(&ig.connlist);
sx_init(&ig.close_conns_mutex, "global_close_conns_lock");
return (error);
}
static int
icl_iser_unload(void)
{
ISER_DBG("Removing iSER datamover...");
if (icl_iser_ncons != 0)
return (EBUSY);
sx_destroy(&ig.close_conns_mutex);
mtx_destroy(&ig.connlist_mutex);
sx_destroy(&ig.device_list_mutex);
icl_unregister("iser", true);
uma_zdestroy(icl_pdu_zone);
return (0);
}
static int
icl_iser_modevent(module_t mod, int what, void *arg)
{
switch (what) {
case MOD_LOAD:
return (icl_iser_load());
case MOD_UNLOAD:
return (icl_iser_unload());
default:
return (EINVAL);
}
}
moduledata_t icl_iser_data = {
.name = "icl_iser",
.evhand = icl_iser_modevent,
.priv = 0
};
DECLARE_MODULE(icl_iser, icl_iser_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(icl_iser, icl, 1, 1, 1);
MODULE_DEPEND(icl_iser, ibcore, 1, 1, 1);
MODULE_DEPEND(icl_iser, linuxkpi, 1, 1, 1);
MODULE_VERSION(icl_iser, 1);