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linux/drivers/infiniband/sw/siw/siw_cm.c

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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
/* Fredy Neeser */
/* Greg Joyce <greg@opengridcomputing.com> */
/* Copyright (c) 2008-2019, IBM Corporation */
/* Copyright (c) 2017, Open Grid Computing, Inc. */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/inetdevice.h>
#include <net/addrconf.h>
#include <linux/workqueue.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <linux/inet.h>
#include <linux/tcp.h>
#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include "siw.h"
#include "siw_cm.h"
/*
* Set to any combination of
* MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
*/
static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
static const bool relaxed_ird_negotiation = true;
static void siw_cm_llp_state_change(struct sock *s);
static void siw_cm_llp_data_ready(struct sock *s);
static void siw_cm_llp_write_space(struct sock *s);
static void siw_cm_llp_error_report(struct sock *s);
static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
int status);
static void siw_sk_assign_cm_upcalls(struct sock *sk)
{
write_lock_bh(&sk->sk_callback_lock);
sk->sk_state_change = siw_cm_llp_state_change;
sk->sk_data_ready = siw_cm_llp_data_ready;
sk->sk_write_space = siw_cm_llp_write_space;
sk->sk_error_report = siw_cm_llp_error_report;
write_unlock_bh(&sk->sk_callback_lock);
}
static void siw_sk_save_upcalls(struct sock *sk)
{
struct siw_cep *cep = sk_to_cep(sk);
write_lock_bh(&sk->sk_callback_lock);
cep->sk_state_change = sk->sk_state_change;
cep->sk_data_ready = sk->sk_data_ready;
cep->sk_write_space = sk->sk_write_space;
cep->sk_error_report = sk->sk_error_report;
write_unlock_bh(&sk->sk_callback_lock);
}
static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
{
sk->sk_state_change = cep->sk_state_change;
sk->sk_data_ready = cep->sk_data_ready;
sk->sk_write_space = cep->sk_write_space;
sk->sk_error_report = cep->sk_error_report;
sk->sk_user_data = NULL;
}
static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
{
struct socket *s = cep->sock;
struct sock *sk = s->sk;
write_lock_bh(&sk->sk_callback_lock);
qp->attrs.sk = s;
sk->sk_data_ready = siw_qp_llp_data_ready;
sk->sk_write_space = siw_qp_llp_write_space;
write_unlock_bh(&sk->sk_callback_lock);
}
static void siw_socket_disassoc(struct socket *s)
{
struct sock *sk = s->sk;
struct siw_cep *cep;
if (sk) {
write_lock_bh(&sk->sk_callback_lock);
cep = sk_to_cep(sk);
if (cep) {
siw_sk_restore_upcalls(sk, cep);
siw_cep_put(cep);
} else {
pr_warn("siw: cannot restore sk callbacks: no ep\n");
}
write_unlock_bh(&sk->sk_callback_lock);
} else {
pr_warn("siw: cannot restore sk callbacks: no sk\n");
}
}
static void siw_rtr_data_ready(struct sock *sk)
{
struct siw_cep *cep;
struct siw_qp *qp = NULL;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
cep = sk_to_cep(sk);
if (!cep) {
WARN(1, "No connection endpoint\n");
goto out;
}
qp = sk_to_qp(sk);
memset(&rd_desc, 0, sizeof(rd_desc));
rd_desc.arg.data = qp;
rd_desc.count = 1;
tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
/*
* Check if first frame was successfully processed.
* Signal connection full establishment if yes.
* Failed data processing would have already scheduled
* connection drop.
*/
if (!qp->rx_stream.rx_suspend)
siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
out:
read_unlock(&sk->sk_callback_lock);
if (qp)
siw_qp_socket_assoc(cep, qp);
}
static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
{
struct sock *sk = cep->sock->sk;
write_lock_bh(&sk->sk_callback_lock);
sk->sk_data_ready = siw_rtr_data_ready;
sk->sk_write_space = siw_qp_llp_write_space;
write_unlock_bh(&sk->sk_callback_lock);
}
static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
{
cep->sock = s;
siw_cep_get(cep);
s->sk->sk_user_data = cep;
siw_sk_save_upcalls(s->sk);
siw_sk_assign_cm_upcalls(s->sk);
}
static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
{
struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
unsigned long flags;
if (!cep)
return NULL;
INIT_LIST_HEAD(&cep->listenq);
INIT_LIST_HEAD(&cep->devq);
INIT_LIST_HEAD(&cep->work_freelist);
kref_init(&cep->ref);
cep->state = SIW_EPSTATE_IDLE;
init_waitqueue_head(&cep->waitq);
spin_lock_init(&cep->lock);
cep->sdev = sdev;
cep->enhanced_rdma_conn_est = false;
spin_lock_irqsave(&sdev->lock, flags);
list_add_tail(&cep->devq, &sdev->cep_list);
spin_unlock_irqrestore(&sdev->lock, flags);
siw_dbg_cep(cep, "new endpoint\n");
return cep;
}
static void siw_cm_free_work(struct siw_cep *cep)
{
struct list_head *w, *tmp;
struct siw_cm_work *work;
list_for_each_safe(w, tmp, &cep->work_freelist) {
work = list_entry(w, struct siw_cm_work, list);
list_del(&work->list);
kfree(work);
}
}
static void siw_cancel_mpatimer(struct siw_cep *cep)
{
spin_lock_bh(&cep->lock);
if (cep->mpa_timer) {
if (cancel_delayed_work(&cep->mpa_timer->work)) {
siw_cep_put(cep);
kfree(cep->mpa_timer); /* not needed again */
}
cep->mpa_timer = NULL;
}
spin_unlock_bh(&cep->lock);
}
static void siw_put_work(struct siw_cm_work *work)
{
INIT_LIST_HEAD(&work->list);
spin_lock_bh(&work->cep->lock);
list_add(&work->list, &work->cep->work_freelist);
spin_unlock_bh(&work->cep->lock);
}
static void siw_cep_set_inuse(struct siw_cep *cep)
{
unsigned long flags;
retry:
spin_lock_irqsave(&cep->lock, flags);
if (cep->in_use) {
spin_unlock_irqrestore(&cep->lock, flags);
wait_event_interruptible(cep->waitq, !cep->in_use);
if (signal_pending(current))
flush_signals(current);
goto retry;
} else {
cep->in_use = 1;
spin_unlock_irqrestore(&cep->lock, flags);
}
}
static void siw_cep_set_free(struct siw_cep *cep)
{
unsigned long flags;
spin_lock_irqsave(&cep->lock, flags);
cep->in_use = 0;
spin_unlock_irqrestore(&cep->lock, flags);
wake_up(&cep->waitq);
}
static void __siw_cep_dealloc(struct kref *ref)
{
struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
struct siw_device *sdev = cep->sdev;
unsigned long flags;
WARN_ON(cep->listen_cep);
/* kfree(NULL) is safe */
kfree(cep->mpa.pdata);
spin_lock_bh(&cep->lock);
if (!list_empty(&cep->work_freelist))
siw_cm_free_work(cep);
spin_unlock_bh(&cep->lock);
spin_lock_irqsave(&sdev->lock, flags);
list_del(&cep->devq);
spin_unlock_irqrestore(&sdev->lock, flags);
siw_dbg_cep(cep, "free endpoint\n");
kfree(cep);
}
static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
{
struct siw_cm_work *work = NULL;
spin_lock_bh(&cep->lock);
if (!list_empty(&cep->work_freelist)) {
work = list_entry(cep->work_freelist.next, struct siw_cm_work,
list);
list_del_init(&work->list);
}
spin_unlock_bh(&cep->lock);
return work;
}
static int siw_cm_alloc_work(struct siw_cep *cep, int num)
{
struct siw_cm_work *work;
while (num--) {
work = kmalloc(sizeof(*work), GFP_KERNEL);
if (!work) {
if (!(list_empty(&cep->work_freelist)))
siw_cm_free_work(cep);
return -ENOMEM;
}
work->cep = cep;
INIT_LIST_HEAD(&work->list);
list_add(&work->list, &cep->work_freelist);
}
return 0;
}
/*
* siw_cm_upcall()
*
* Upcall to IWCM to inform about async connection events
*/
static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
int status)
{
struct iw_cm_event event;
struct iw_cm_id *id;
memset(&event, 0, sizeof(event));
event.status = status;
event.event = reason;
if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
event.provider_data = cep;
id = cep->listen_cep->cm_id;
} else {
id = cep->cm_id;
}
/* Signal IRD and ORD */
if (reason == IW_CM_EVENT_ESTABLISHED ||
reason == IW_CM_EVENT_CONNECT_REPLY) {
/* Signal negotiated IRD/ORD values we will use */
event.ird = cep->ird;
event.ord = cep->ord;
} else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
event.ird = cep->ord;
event.ord = cep->ird;
}
/* Signal private data and address information */
if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
reason == IW_CM_EVENT_CONNECT_REPLY) {
u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
if (pd_len) {
/*
* hand over MPA private data
*/
event.private_data_len = pd_len;
event.private_data = cep->mpa.pdata;
/* Hide MPA V2 IRD/ORD control */
if (cep->enhanced_rdma_conn_est) {
event.private_data_len -=
sizeof(struct mpa_v2_data);
event.private_data +=
sizeof(struct mpa_v2_data);
}
}
getname_local(cep->sock, &event.local_addr);
getname_peer(cep->sock, &event.remote_addr);
}
siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
return id->event_handler(id, &event);
}
/*
* siw_qp_cm_drop()
*
* Drops established LLP connection if present and not already
* scheduled for dropping. Called from user context, SQ workqueue
* or receive IRQ. Caller signals if socket can be immediately
* closed (basically, if not in IRQ).
*/
void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
{
struct siw_cep *cep = qp->cep;
qp->rx_stream.rx_suspend = 1;
qp->tx_ctx.tx_suspend = 1;
if (!qp->cep)
return;
if (schedule) {
siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
} else {
siw_cep_set_inuse(cep);
if (cep->state == SIW_EPSTATE_CLOSED) {
siw_dbg_cep(cep, "already closed\n");
goto out;
}
siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
if (qp->term_info.valid)
siw_send_terminate(qp);
if (cep->cm_id) {
switch (cep->state) {
case SIW_EPSTATE_AWAIT_MPAREP:
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
-EINVAL);
break;
case SIW_EPSTATE_RDMA_MODE:
siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
break;
case SIW_EPSTATE_IDLE:
case SIW_EPSTATE_LISTENING:
case SIW_EPSTATE_CONNECTING:
case SIW_EPSTATE_AWAIT_MPAREQ:
case SIW_EPSTATE_RECVD_MPAREQ:
case SIW_EPSTATE_CLOSED:
default:
break;
}
cep->cm_id->rem_ref(cep->cm_id);
cep->cm_id = NULL;
siw_cep_put(cep);
}
cep->state = SIW_EPSTATE_CLOSED;
if (cep->sock) {
siw_socket_disassoc(cep->sock);
/*
* Immediately close socket
*/
sock_release(cep->sock);
cep->sock = NULL;
}
if (cep->qp) {
cep->qp = NULL;
siw_qp_put(qp);
}
out:
siw_cep_set_free(cep);
}
}
void siw_cep_put(struct siw_cep *cep)
{
WARN_ON(kref_read(&cep->ref) < 1);
kref_put(&cep->ref, __siw_cep_dealloc);
}
void siw_cep_get(struct siw_cep *cep)
{
kref_get(&cep->ref);
}
/*
* Expects params->pd_len in host byte order
*/
static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
{
struct socket *s = cep->sock;
struct mpa_rr *rr = &cep->mpa.hdr;
struct kvec iov[3];
struct msghdr msg;
int rv;
int iovec_num = 0;
int mpa_len;
memset(&msg, 0, sizeof(msg));
iov[iovec_num].iov_base = rr;
iov[iovec_num].iov_len = sizeof(*rr);
mpa_len = sizeof(*rr);
if (cep->enhanced_rdma_conn_est) {
iovec_num++;
iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
mpa_len += sizeof(cep->mpa.v2_ctrl);
}
if (pd_len) {
iovec_num++;
iov[iovec_num].iov_base = (char *)pdata;
iov[iovec_num].iov_len = pd_len;
mpa_len += pd_len;
}
if (cep->enhanced_rdma_conn_est)
pd_len += sizeof(cep->mpa.v2_ctrl);
rr->params.pd_len = cpu_to_be16(pd_len);
rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
return rv < 0 ? rv : 0;
}
/*
* Receive MPA Request/Reply header.
*
* Returns 0 if complete MPA Request/Reply header including
* eventual private data was received. Returns -EAGAIN if
* header was partially received or negative error code otherwise.
*
* Context: May be called in process context only
*/
static int siw_recv_mpa_rr(struct siw_cep *cep)
{
struct mpa_rr *hdr = &cep->mpa.hdr;
struct socket *s = cep->sock;
u16 pd_len;
int rcvd, to_rcv;
if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) {
rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd,
sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd,
0);
if (rcvd <= 0)
return -ECONNABORTED;
cep->mpa.bytes_rcvd += rcvd;
if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr))
return -EAGAIN;
if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA)
return -EPROTO;
}
pd_len = be16_to_cpu(hdr->params.pd_len);
/*
* At least the MPA Request/Reply header (frame not including
* private data) has been received.
* Receive (or continue receiving) any private data.
*/
to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr));
if (!to_rcv) {
/*
* We must have hdr->params.pd_len == 0 and thus received a
* complete MPA Request/Reply frame.
* Check against peer protocol violation.
*/
u32 word;
rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT);
if (rcvd == -EAGAIN)
return 0;
if (rcvd == 0) {
siw_dbg_cep(cep, "peer EOF\n");
return -EPIPE;
}
if (rcvd < 0) {
siw_dbg_cep(cep, "error: %d\n", rcvd);
return rcvd;
}
siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd);
return -EPROTO;
}
/*
* At this point, we must have hdr->params.pd_len != 0.
* A private data buffer gets allocated if hdr->params.pd_len != 0.
*/
if (!cep->mpa.pdata) {
cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL);
if (!cep->mpa.pdata)
return -ENOMEM;
}
rcvd = ksock_recv(
s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr),
to_rcv + 4, MSG_DONTWAIT);
if (rcvd < 0)
return rcvd;
if (rcvd > to_rcv)
return -EPROTO;
cep->mpa.bytes_rcvd += rcvd;
if (to_rcv == rcvd) {
siw_dbg_cep(cep, "%d bytes private data received\n", pd_len);
return 0;
}
return -EAGAIN;
}
/*
* siw_proc_mpareq()
*
* Read MPA Request from socket and signal new connection to IWCM
* if success. Caller must hold lock on corresponding listening CEP.
*/
static int siw_proc_mpareq(struct siw_cep *cep)
{
struct mpa_rr *req;
int version, rv;
u16 pd_len;
rv = siw_recv_mpa_rr(cep);
if (rv)
return rv;
req = &cep->mpa.hdr;
version = __mpa_rr_revision(req->params.bits);
pd_len = be16_to_cpu(req->params.pd_len);
if (version > MPA_REVISION_2)
/* allow for 0, 1, and 2 only */
return -EPROTO;
if (memcmp(req->key, MPA_KEY_REQ, 16))
return -EPROTO;
/* Prepare for sending MPA reply */
memcpy(req->key, MPA_KEY_REP, 16);
if (version == MPA_REVISION_2 &&
(req->params.bits & MPA_RR_FLAG_ENHANCED)) {
/*
* MPA version 2 must signal IRD/ORD values and P2P mode
* in private data if header flag MPA_RR_FLAG_ENHANCED
* is set.
*/
if (pd_len < sizeof(struct mpa_v2_data))
goto reject_conn;
cep->enhanced_rdma_conn_est = true;
}
/* MPA Markers: currently not supported. Marker TX to be added. */
if (req->params.bits & MPA_RR_FLAG_MARKERS)
goto reject_conn;
if (req->params.bits & MPA_RR_FLAG_CRC) {
/*
* RFC 5044, page 27: CRC MUST be used if peer requests it.
* siw specific: 'mpa_crc_strict' parameter to reject
* connection with CRC if local CRC off enforced by
* 'mpa_crc_strict' module parameter.
*/
if (!mpa_crc_required && mpa_crc_strict)
goto reject_conn;
/* Enable CRC if requested by module parameter */
if (mpa_crc_required)
req->params.bits |= MPA_RR_FLAG_CRC;
}
if (cep->enhanced_rdma_conn_est) {
struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata;
/*
* Peer requested ORD becomes requested local IRD,
* peer requested IRD becomes requested local ORD.
* IRD and ORD get limited by global maximum values.
*/
cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
cep->ord = min(cep->ord, SIW_MAX_ORD_QP);
cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
cep->ird = min(cep->ird, SIW_MAX_IRD_QP);
/* May get overwritten by locally negotiated values */
cep->mpa.v2_ctrl.ird = htons(cep->ird);
cep->mpa.v2_ctrl.ord = htons(cep->ord);
/*
* Support for peer sent zero length Write or Read to
* let local side enter RTS. Writes are preferred.
* Sends would require pre-posting a Receive and are
* not supported.
* Propose zero length Write if none of Read and Write
* is indicated.
*/
if (v2->ird & MPA_V2_PEER_TO_PEER) {
cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
if (v2->ord & MPA_V2_RDMA_WRITE_RTR)
cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
else if (v2->ord & MPA_V2_RDMA_READ_RTR)
cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR;
else
cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
}
}
cep->state = SIW_EPSTATE_RECVD_MPAREQ;
/* Keep reference until IWCM accepts/rejects */
siw_cep_get(cep);
rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0);
if (rv)
siw_cep_put(cep);
return rv;
reject_conn:
siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n",
req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
mpa_crc_required, mpa_crc_strict,
req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
req->params.bits &= ~MPA_RR_FLAG_MARKERS;
req->params.bits |= MPA_RR_FLAG_REJECT;
if (!mpa_crc_required && mpa_crc_strict)
req->params.bits &= ~MPA_RR_FLAG_CRC;
if (pd_len)
kfree(cep->mpa.pdata);
cep->mpa.pdata = NULL;
siw_send_mpareqrep(cep, NULL, 0);
return -EOPNOTSUPP;
}
static int siw_proc_mpareply(struct siw_cep *cep)
{
struct siw_qp_attrs qp_attrs;
enum siw_qp_attr_mask qp_attr_mask;
struct siw_qp *qp = cep->qp;
struct mpa_rr *rep;
int rv;
u16 rep_ord;
u16 rep_ird;
bool ird_insufficient = false;
enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR;
rv = siw_recv_mpa_rr(cep);
if (rv != -EAGAIN)
siw_cancel_mpatimer(cep);
if (rv)
goto out_err;
rep = &cep->mpa.hdr;
if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) {
/* allow for 0, 1, and 2 only */
rv = -EPROTO;
goto out_err;
}
if (memcmp(rep->key, MPA_KEY_REP, 16)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA,
LLP_ECODE_INVALID_REQ_RESP, 0);
siw_send_terminate(qp);
rv = -EPROTO;
goto out_err;
}
if (rep->params.bits & MPA_RR_FLAG_REJECT) {
siw_dbg_cep(cep, "got mpa reject\n");
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET);
return -ECONNRESET;
}
if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) {
siw_dbg_cep(cep, "peer allows GSO on TX\n");
qp->tx_ctx.gso_seg_limit = 0;
}
if ((rep->params.bits & MPA_RR_FLAG_MARKERS) ||
(mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) ||
(mpa_crc_strict && !mpa_crc_required &&
(rep->params.bits & MPA_RR_FLAG_CRC))) {
siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n",
rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
mpa_crc_required, mpa_crc_strict,
rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED);
return -EINVAL;
}
if (cep->enhanced_rdma_conn_est) {
struct mpa_v2_data *v2;
if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 ||
!(rep->params.bits & MPA_RR_FLAG_ENHANCED)) {
/*
* Protocol failure: The responder MUST reply with
* MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED.
*/
siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n",
__mpa_rr_revision(rep->params.bits),
rep->params.bits & MPA_RR_FLAG_ENHANCED ?
1 :
0);
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
-ECONNRESET);
return -EINVAL;
}
v2 = (struct mpa_v2_data *)cep->mpa.pdata;
rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
if (cep->ird < rep_ord &&
(relaxed_ird_negotiation == false ||
rep_ord > cep->sdev->attrs.max_ird)) {
siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n",
cep->ird, rep_ord,
cep->sdev->attrs.max_ord);
ird_insufficient = true;
}
if (cep->ord > rep_ird && relaxed_ird_negotiation == false) {
siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord,
rep_ird);
ird_insufficient = true;
}
/*
* Always report negotiated peer values to user,
* even if IRD/ORD negotiation failed
*/
cep->ird = rep_ord;
cep->ord = rep_ird;
if (ird_insufficient) {
/*
* If the initiator IRD is insuffient for the
* responder ORD, send a TERM.
*/
siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
LLP_ETYPE_MPA,
LLP_ECODE_INSUFFICIENT_IRD, 0);
siw_send_terminate(qp);
rv = -ENOMEM;
goto out_err;
}
if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER)
mpa_p2p_mode =
cep->mpa.v2_ctrl_req.ord &
(MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR);
/*
* Check if we requested P2P mode, and if peer agrees
*/
if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
if ((mpa_p2p_mode & v2->ord) == 0) {
/*
* We requested RTR mode(s), but the peer
* did not pick any mode we support.
*/
siw_dbg_cep(cep,
"rtr mode: req %2x, got %2x\n",
mpa_p2p_mode,
v2->ord & (MPA_V2_RDMA_WRITE_RTR |
MPA_V2_RDMA_READ_RTR));
siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
LLP_ETYPE_MPA,
LLP_ECODE_NO_MATCHING_RTR,
0);
siw_send_terminate(qp);
rv = -EPROTO;
goto out_err;
}
mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR |
MPA_V2_RDMA_READ_RTR);
}
}
memset(&qp_attrs, 0, sizeof(qp_attrs));
if (rep->params.bits & MPA_RR_FLAG_CRC)
qp_attrs.flags = SIW_MPA_CRC;
qp_attrs.irq_size = cep->ird;
qp_attrs.orq_size = cep->ord;
qp_attrs.sk = cep->sock;
qp_attrs.state = SIW_QP_STATE_RTS;
qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA;
/* Move socket RX/TX under QP control */
down_write(&qp->state_lock);
if (qp->attrs.state > SIW_QP_STATE_RTR) {
rv = -EINVAL;
up_write(&qp->state_lock);
goto out_err;
}
rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask);
siw_qp_socket_assoc(cep, qp);
up_write(&qp->state_lock);
/* Send extra RDMA frame to trigger peer RTS if negotiated */
if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
rv = siw_qp_mpa_rts(qp, mpa_p2p_mode);
if (rv)
goto out_err;
}
if (!rv) {
rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0);
if (!rv)
cep->state = SIW_EPSTATE_RDMA_MODE;
return 0;
}
out_err:
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL);
return rv;
}
/*
* siw_accept_newconn - accept an incoming pending connection
*
*/
static void siw_accept_newconn(struct siw_cep *cep)
{
struct socket *s = cep->sock;
struct socket *new_s = NULL;
struct siw_cep *new_cep = NULL;
int rv = 0; /* debug only. should disappear */
if (cep->state != SIW_EPSTATE_LISTENING)
goto error;
new_cep = siw_cep_alloc(cep->sdev);
if (!new_cep)
goto error;
/*
* 4: Allocate a sufficient number of work elements
* to allow concurrent handling of local + peer close
* events, MPA header processing + MPA timeout.
*/
if (siw_cm_alloc_work(new_cep, 4) != 0)
goto error;
/*
* Copy saved socket callbacks from listening CEP
* and assign new socket with new CEP
*/
new_cep->sk_state_change = cep->sk_state_change;
new_cep->sk_data_ready = cep->sk_data_ready;
new_cep->sk_write_space = cep->sk_write_space;
new_cep->sk_error_report = cep->sk_error_report;
rv = kernel_accept(s, &new_s, O_NONBLOCK);
if (rv != 0) {
/*
* Connection already aborted by peer..?
*/
siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv);
goto error;
}
new_cep->sock = new_s;
siw_cep_get(new_cep);
new_s->sk->sk_user_data = new_cep;
if (siw_tcp_nagle == false) {
int val = 1;
rv = kernel_setsockopt(new_s, SOL_TCP, TCP_NODELAY,
(char *)&val, sizeof(val));
if (rv) {
siw_dbg_cep(cep, "setsockopt NODELAY error: %d\n", rv);
goto error;
}
}
new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT);
if (rv)
goto error;
/*
* See siw_proc_mpareq() etc. for the use of new_cep->listen_cep.
*/
new_cep->listen_cep = cep;
siw_cep_get(cep);
if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
/*
* MPA REQ already queued
*/
siw_dbg_cep(cep, "immediate mpa request\n");
siw_cep_set_inuse(new_cep);
rv = siw_proc_mpareq(new_cep);
siw_cep_set_free(new_cep);
if (rv != -EAGAIN) {
siw_cep_put(cep);
new_cep->listen_cep = NULL;
if (rv)
goto error;
}
}
return;
error:
if (new_cep)
siw_cep_put(new_cep);
if (new_s) {
siw_socket_disassoc(new_s);
sock_release(new_s);
new_cep->sock = NULL;
}
siw_dbg_cep(cep, "error %d\n", rv);
}
static void siw_cm_work_handler(struct work_struct *w)
{
struct siw_cm_work *work;
struct siw_cep *cep;
int release_cep = 0, rv = 0;
work = container_of(w, struct siw_cm_work, work.work);
cep = work->cep;
siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
cep->qp ? qp_id(cep->qp) : UINT_MAX,
work->type, cep->state);
siw_cep_set_inuse(cep);
switch (work->type) {
case SIW_CM_WORK_ACCEPT:
siw_accept_newconn(cep);
break;
case SIW_CM_WORK_READ_MPAHDR:
if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
if (cep->listen_cep) {
siw_cep_set_inuse(cep->listen_cep);
if (cep->listen_cep->state ==
SIW_EPSTATE_LISTENING)
rv = siw_proc_mpareq(cep);
else
rv = -EFAULT;
siw_cep_set_free(cep->listen_cep);
if (rv != -EAGAIN) {
siw_cep_put(cep->listen_cep);
cep->listen_cep = NULL;
if (rv)
siw_cep_put(cep);
}
}
} else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
rv = siw_proc_mpareply(cep);
} else {
/*
* CEP already moved out of MPA handshake.
* any connection management already done.
* silently ignore the mpa packet.
*/
if (cep->state == SIW_EPSTATE_RDMA_MODE) {
cep->sock->sk->sk_data_ready(cep->sock->sk);
siw_dbg_cep(cep, "already in RDMA mode");
} else {
siw_dbg_cep(cep, "out of state: %d\n",
cep->state);
}
}
if (rv && rv != EAGAIN)
release_cep = 1;
break;
case SIW_CM_WORK_CLOSE_LLP:
/*
* QP scheduled LLP close
*/
if (cep->qp && cep->qp->term_info.valid)
siw_send_terminate(cep->qp);
if (cep->cm_id)
siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
release_cep = 1;
break;
case SIW_CM_WORK_PEER_CLOSE:
if (cep->cm_id) {
if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
/*
* MPA reply not received, but connection drop
*/
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
-ECONNRESET);
} else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
/*
* NOTE: IW_CM_EVENT_DISCONNECT is given just
* to transition IWCM into CLOSING.
*/
siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
}
/*
* for other states there is no connection
* known to the IWCM.
*/
} else {
if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
/*
* Wait for the ulp/CM to call accept/reject
*/
siw_dbg_cep(cep,
"mpa req recvd, wait for ULP\n");
} else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
/*
* Socket close before MPA request received.
*/
siw_dbg_cep(cep, "no mpareq: drop listener\n");
siw_cep_put(cep->listen_cep);
cep->listen_cep = NULL;
}
}
release_cep = 1;
break;
case SIW_CM_WORK_MPATIMEOUT:
cep->mpa_timer = NULL;
if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
/*
* MPA request timed out:
* Hide any partially received private data and signal
* timeout
*/
cep->mpa.hdr.params.pd_len = 0;
if (cep->cm_id)
siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
-ETIMEDOUT);
release_cep = 1;
} else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
/*
* No MPA request received after peer TCP stream setup.
*/
if (cep->listen_cep) {
siw_cep_put(cep->listen_cep);
cep->listen_cep = NULL;
}
release_cep = 1;
}
break;
default:
WARN(1, "Undefined CM work type: %d\n", work->type);
}
if (release_cep) {
siw_dbg_cep(cep,
"release: timer=%s, QP[%u]\n",
cep->mpa_timer ? "y" : "n",
cep->qp ? qp_id(cep->qp) : UINT_MAX);
siw_cancel_mpatimer(cep);
cep->state = SIW_EPSTATE_CLOSED;
if (cep->qp) {
struct siw_qp *qp = cep->qp;
/*
* Serialize a potential race with application
* closing the QP and calling siw_qp_cm_drop()
*/
siw_qp_get(qp);
siw_cep_set_free(cep);
siw_qp_llp_close(qp);
siw_qp_put(qp);
siw_cep_set_inuse(cep);
cep->qp = NULL;
siw_qp_put(qp);
}
if (cep->sock) {
siw_socket_disassoc(cep->sock);
sock_release(cep->sock);
cep->sock = NULL;
}
if (cep->cm_id) {
cep->cm_id->rem_ref(cep->cm_id);
cep->cm_id = NULL;
siw_cep_put(cep);
}
}
siw_cep_set_free(cep);
siw_put_work(work);
siw_cep_put(cep);
}
static struct workqueue_struct *siw_cm_wq;
int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
{
struct siw_cm_work *work = siw_get_work(cep);
unsigned long delay = 0;
if (!work) {
siw_dbg_cep(cep, "failed with no work available\n");
return -ENOMEM;
}
work->type = type;
work->cep = cep;
siw_cep_get(cep);
INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
if (type == SIW_CM_WORK_MPATIMEOUT) {
cep->mpa_timer = work;
if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
delay = MPAREQ_TIMEOUT;
else
delay = MPAREP_TIMEOUT;
}
siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
cep->qp ? qp_id(cep->qp) : -1, type, delay);
queue_delayed_work(siw_cm_wq, &work->work, delay);
return 0;
}
static void siw_cm_llp_data_ready(struct sock *sk)
{
struct siw_cep *cep;
read_lock(&sk->sk_callback_lock);
cep = sk_to_cep(sk);
if (!cep)
goto out;
siw_dbg_cep(cep, "state: %d\n", cep->state);
switch (cep->state) {
case SIW_EPSTATE_RDMA_MODE:
/* fall through */
case SIW_EPSTATE_LISTENING:
break;
case SIW_EPSTATE_AWAIT_MPAREQ:
/* fall through */
case SIW_EPSTATE_AWAIT_MPAREP:
siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
break;
default:
siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
break;
}
out:
read_unlock(&sk->sk_callback_lock);
}
static void siw_cm_llp_write_space(struct sock *sk)
{
struct siw_cep *cep = sk_to_cep(sk);
if (cep)
siw_dbg_cep(cep, "state: %d\n", cep->state);
}
static void siw_cm_llp_error_report(struct sock *sk)
{
struct siw_cep *cep = sk_to_cep(sk);
if (cep) {
siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
sk->sk_err, sk->sk_state, cep->state);
cep->sk_error_report(sk);
}
}
static void siw_cm_llp_state_change(struct sock *sk)
{
struct siw_cep *cep;
void (*orig_state_change)(struct sock *s);
read_lock(&sk->sk_callback_lock);
cep = sk_to_cep(sk);
if (!cep) {
/* endpoint already disassociated */
read_unlock(&sk->sk_callback_lock);
return;
}
orig_state_change = cep->sk_state_change;
siw_dbg_cep(cep, "state: %d\n", cep->state);
switch (sk->sk_state) {
case TCP_ESTABLISHED:
/*
* handle accepting socket as special case where only
* new connection is possible
*/
siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
break;
case TCP_CLOSE:
case TCP_CLOSE_WAIT:
if (cep->qp)
cep->qp->tx_ctx.tx_suspend = 1;
siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
break;
default:
siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
}
read_unlock(&sk->sk_callback_lock);
orig_state_change(sk);
}
static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
struct sockaddr *raddr)
{
int rv, flags = 0, s_val = 1;
size_t size = laddr->sa_family == AF_INET ?
sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
/*
* Make address available again asap.
*/
rv = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
sizeof(s_val));
if (rv < 0)
return rv;
rv = s->ops->bind(s, laddr, size);
if (rv < 0)
return rv;
rv = s->ops->connect(s, raddr, size, flags);
return rv < 0 ? rv : 0;
}
int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
{
struct siw_device *sdev = to_siw_dev(id->device);
struct siw_qp *qp;
struct siw_cep *cep = NULL;
struct socket *s = NULL;
struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
*raddr = (struct sockaddr *)&id->remote_addr;
bool p2p_mode = peer_to_peer, v4 = true;
u16 pd_len = params->private_data_len;
int version = mpa_version, rv;
if (pd_len > MPA_MAX_PRIVDATA)
return -EINVAL;
if (params->ird > sdev->attrs.max_ird ||
params->ord > sdev->attrs.max_ord)
return -ENOMEM;
if (laddr->sa_family == AF_INET6)
v4 = false;
else if (laddr->sa_family != AF_INET)
return -EAFNOSUPPORT;
/*
* Respect any iwarp port mapping: Use mapped remote address
* if valid. Local address must not be mapped, since siw
* uses kernel TCP stack.
*/
if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
to_sockaddr_in6(id->remote_addr).sin6_port != 0)
raddr = (struct sockaddr *)&id->m_remote_addr;
qp = siw_qp_id2obj(sdev, params->qpn);
if (!qp) {
WARN(1, "[QP %u] does not exist\n", params->qpn);
rv = -EINVAL;
goto error;
}
siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr,
raddr);
rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
if (rv < 0)
goto error;
/*
* NOTE: For simplification, connect() is called in blocking
* mode. Might be reconsidered for async connection setup at
* TCP level.
*/
rv = kernel_bindconnect(s, laddr, raddr);
if (rv != 0) {
siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
goto error;
}
if (siw_tcp_nagle == false) {
int val = 1;
rv = kernel_setsockopt(s, SOL_TCP, TCP_NODELAY, (char *)&val,
sizeof(val));
if (rv) {
siw_dbg_qp(qp, "setsockopt NODELAY error: %d\n", rv);
goto error;
}
}
cep = siw_cep_alloc(sdev);
if (!cep) {
rv = -ENOMEM;
goto error;
}
siw_cep_set_inuse(cep);
/* Associate QP with CEP */
siw_cep_get(cep);
qp->cep = cep;
/* siw_qp_get(qp) already done by QP lookup */
cep->qp = qp;
id->add_ref(id);
cep->cm_id = id;
/*
* 4: Allocate a sufficient number of work elements
* to allow concurrent handling of local + peer close
* events, MPA header processing + MPA timeout.
*/
rv = siw_cm_alloc_work(cep, 4);
if (rv != 0) {
rv = -ENOMEM;
goto error;
}
cep->ird = params->ird;
cep->ord = params->ord;
if (p2p_mode && cep->ord == 0)
cep->ord = 1;
cep->state = SIW_EPSTATE_CONNECTING;
/*
* Associate CEP with socket
*/
siw_cep_socket_assoc(cep, s);
cep->state = SIW_EPSTATE_AWAIT_MPAREP;
/*
* Set MPA Request bits: CRC if required, no MPA Markers,
* MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
*/
cep->mpa.hdr.params.bits = 0;
if (version > MPA_REVISION_2) {
pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
version = MPA_REVISION_2;
/* Adjust also module parameter */
mpa_version = MPA_REVISION_2;
}
__mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
if (try_gso)
cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
if (mpa_crc_required)
cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
/*
* If MPA version == 2:
* o Include ORD and IRD.
* o Indicate peer-to-peer mode, if required by module
* parameter 'peer_to_peer'.
*/
if (version == MPA_REVISION_2) {
cep->enhanced_rdma_conn_est = true;
cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
cep->mpa.v2_ctrl.ird = htons(cep->ird);
cep->mpa.v2_ctrl.ord = htons(cep->ord);
if (p2p_mode) {
cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
cep->mpa.v2_ctrl.ord |= rtr_type;
}
/* Remember own P2P mode requested */
cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
}
memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
/*
* Reset private data.
*/
cep->mpa.hdr.params.pd_len = 0;
if (rv >= 0) {
rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
if (!rv) {
siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
siw_cep_set_free(cep);
return 0;
}
}
error:
siw_dbg(id->device, "failed: %d\n", rv);
if (cep) {
siw_socket_disassoc(s);
sock_release(s);
cep->sock = NULL;
cep->qp = NULL;
cep->cm_id = NULL;
id->rem_ref(id);
siw_cep_put(cep);
qp->cep = NULL;
siw_cep_put(cep);
cep->state = SIW_EPSTATE_CLOSED;
siw_cep_set_free(cep);
siw_cep_put(cep);
} else if (s) {
sock_release(s);
}
if (qp)
siw_qp_put(qp);
return rv;
}
/*
* siw_accept - Let SoftiWARP accept an RDMA connection request
*
* @id: New connection management id to be used for accepted
* connection request
* @params: Connection parameters provided by ULP for accepting connection
*
* Transition QP to RTS state, associate new CM id @id with accepted CEP
* and get prepared for TCP input by installing socket callbacks.
* Then send MPA Reply and generate the "connection established" event.
* Socket callbacks must be installed before sending MPA Reply, because
* the latter may cause a first RDMA message to arrive from the RDMA Initiator
* side very quickly, at which time the socket callbacks must be ready.
*/
int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
{
struct siw_device *sdev = to_siw_dev(id->device);
struct siw_cep *cep = (struct siw_cep *)id->provider_data;
struct siw_qp *qp;
struct siw_qp_attrs qp_attrs;
int rv, max_priv_data = MPA_MAX_PRIVDATA;
bool wait_for_peer_rts = false;
siw_cep_set_inuse(cep);
siw_cep_put(cep);
/* Free lingering inbound private data */
if (cep->mpa.hdr.params.pd_len) {
cep->mpa.hdr.params.pd_len = 0;
kfree(cep->mpa.pdata);
cep->mpa.pdata = NULL;
}
siw_cancel_mpatimer(cep);
if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
siw_dbg_cep(cep, "out of state\n");
siw_cep_set_free(cep);
siw_cep_put(cep);
return -ECONNRESET;
}
qp = siw_qp_id2obj(sdev, params->qpn);
if (!qp) {
WARN(1, "[QP %d] does not exist\n", params->qpn);
siw_cep_set_free(cep);
siw_cep_put(cep);
return -EINVAL;
}
down_write(&qp->state_lock);
if (qp->attrs.state > SIW_QP_STATE_RTR) {
rv = -EINVAL;
up_write(&qp->state_lock);
goto error;
}
siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
siw_dbg_cep(cep, "peer allows GSO on TX\n");
qp->tx_ctx.gso_seg_limit = 0;
}
if (params->ord > sdev->attrs.max_ord ||
params->ird > sdev->attrs.max_ird) {
siw_dbg_cep(
cep,
"[QP %u]: ord %d (max %d), ird %d (max %d)\n",
qp_id(qp), params->ord, sdev->attrs.max_ord,
params->ird, sdev->attrs.max_ird);
rv = -EINVAL;
up_write(&qp->state_lock);
goto error;
}
if (cep->enhanced_rdma_conn_est)
max_priv_data -= sizeof(struct mpa_v2_data);
if (params->private_data_len > max_priv_data) {
siw_dbg_cep(
cep,
"[QP %u]: private data length: %d (max %d)\n",
qp_id(qp), params->private_data_len, max_priv_data);
rv = -EINVAL;
up_write(&qp->state_lock);
goto error;
}
if (cep->enhanced_rdma_conn_est) {
if (params->ord > cep->ord) {
if (relaxed_ird_negotiation) {
params->ord = cep->ord;
} else {
cep->ird = params->ird;
cep->ord = params->ord;
rv = -EINVAL;
up_write(&qp->state_lock);
goto error;
}
}
if (params->ird < cep->ird) {
if (relaxed_ird_negotiation &&
cep->ird <= sdev->attrs.max_ird)
params->ird = cep->ird;
else {
rv = -ENOMEM;
up_write(&qp->state_lock);
goto error;
}
}
if (cep->mpa.v2_ctrl.ord &
(MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
wait_for_peer_rts = true;
/*
* Signal back negotiated IRD and ORD values
*/
cep->mpa.v2_ctrl.ord =
htons(params->ord & MPA_IRD_ORD_MASK) |
(cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
cep->mpa.v2_ctrl.ird =
htons(params->ird & MPA_IRD_ORD_MASK) |
(cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
}
cep->ird = params->ird;
cep->ord = params->ord;
cep->cm_id = id;
id->add_ref(id);
memset(&qp_attrs, 0, sizeof(qp_attrs));
qp_attrs.orq_size = cep->ord;
qp_attrs.irq_size = cep->ird;
qp_attrs.sk = cep->sock;
if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
qp_attrs.flags = SIW_MPA_CRC;
qp_attrs.state = SIW_QP_STATE_RTS;
siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
/* Associate QP with CEP */
siw_cep_get(cep);
qp->cep = cep;
/* siw_qp_get(qp) already done by QP lookup */
cep->qp = qp;
cep->state = SIW_EPSTATE_RDMA_MODE;
/* Move socket RX/TX under QP control */
rv = siw_qp_modify(qp, &qp_attrs,
SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
SIW_QP_ATTR_MPA);
up_write(&qp->state_lock);
if (rv)
goto error;
siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
qp_id(qp), params->private_data_len);
rv = siw_send_mpareqrep(cep, params->private_data,
params->private_data_len);
if (rv != 0)
goto error;
if (wait_for_peer_rts) {
siw_sk_assign_rtr_upcalls(cep);
} else {
siw_qp_socket_assoc(cep, qp);
rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
if (rv)
goto error;
}
siw_cep_set_free(cep);
return 0;
error:
siw_socket_disassoc(cep->sock);
sock_release(cep->sock);
cep->sock = NULL;
cep->state = SIW_EPSTATE_CLOSED;
if (cep->cm_id) {
cep->cm_id->rem_ref(id);
cep->cm_id = NULL;
}
if (qp->cep) {
siw_cep_put(cep);
qp->cep = NULL;
}
cep->qp = NULL;
siw_qp_put(qp);
siw_cep_set_free(cep);
siw_cep_put(cep);
return rv;
}
/*
* siw_reject()
*
* Local connection reject case. Send private data back to peer,
* close connection and dereference connection id.
*/
int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
{
struct siw_cep *cep = (struct siw_cep *)id->provider_data;
siw_cep_set_inuse(cep);
siw_cep_put(cep);
siw_cancel_mpatimer(cep);
if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
siw_dbg_cep(cep, "out of state\n");
siw_cep_set_free(cep);
siw_cep_put(cep); /* put last reference */
return -ECONNRESET;
}
siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
pd_len);
if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
siw_send_mpareqrep(cep, pdata, pd_len);
}
siw_socket_disassoc(cep->sock);
sock_release(cep->sock);
cep->sock = NULL;
cep->state = SIW_EPSTATE_CLOSED;
siw_cep_set_free(cep);
siw_cep_put(cep);
return 0;
}
/*
* siw_create_listen - Create resources for a listener's IWCM ID @id
*
* Starts listen on the socket address id->local_addr.
*
*/
int siw_create_listen(struct iw_cm_id *id, int backlog)
{
struct socket *s;
struct siw_cep *cep = NULL;
struct siw_device *sdev = to_siw_dev(id->device);
int addr_family = id->local_addr.ss_family;
int rv = 0, s_val;
if (addr_family != AF_INET && addr_family != AF_INET6)
return -EAFNOSUPPORT;
rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
if (rv < 0)
return rv;
/*
* Allow binding local port when still in TIME_WAIT from last close.
*/
s_val = 1;
rv = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
sizeof(s_val));
if (rv) {
siw_dbg(id->device, "setsockopt error: %d\n", rv);
goto error;
}
if (addr_family == AF_INET) {
struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
/* For wildcard addr, limit binding to current device only */
if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
rv = s->ops->bind(s, (struct sockaddr *)laddr,
sizeof(struct sockaddr_in));
} else {
struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
/* For wildcard addr, limit binding to current device only */
if (ipv6_addr_any(&laddr->sin6_addr))
s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
rv = s->ops->bind(s, (struct sockaddr *)laddr,
sizeof(struct sockaddr_in6));
}
if (rv) {
siw_dbg(id->device, "socket bind error: %d\n", rv);
goto error;
}
cep = siw_cep_alloc(sdev);
if (!cep) {
rv = -ENOMEM;
goto error;
}
siw_cep_socket_assoc(cep, s);
rv = siw_cm_alloc_work(cep, backlog);
if (rv) {
siw_dbg(id->device,
"alloc_work error %d, backlog %d\n",
rv, backlog);
goto error;
}
rv = s->ops->listen(s, backlog);
if (rv) {
siw_dbg(id->device, "listen error %d\n", rv);
goto error;
}
cep->cm_id = id;
id->add_ref(id);
/*
* In case of a wildcard rdma_listen on a multi-homed device,
* a listener's IWCM id is associated with more than one listening CEP.
*
* We currently use id->provider_data in three different ways:
*
* o For a listener's IWCM id, id->provider_data points to
* the list_head of the list of listening CEPs.
* Uses: siw_create_listen(), siw_destroy_listen()
*
* o For each accepted passive-side IWCM id, id->provider_data
* points to the CEP itself. This is a consequence of
* - siw_cm_upcall() setting event.provider_data = cep and
* - the IWCM's cm_conn_req_handler() setting provider_data of the
* new passive-side IWCM id equal to event.provider_data
* Uses: siw_accept(), siw_reject()
*
* o For an active-side IWCM id, id->provider_data is not used at all.
*
*/
if (!id->provider_data) {
id->provider_data =
kmalloc(sizeof(struct list_head), GFP_KERNEL);
if (!id->provider_data) {
rv = -ENOMEM;
goto error;
}
INIT_LIST_HEAD((struct list_head *)id->provider_data);
}
list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
cep->state = SIW_EPSTATE_LISTENING;
siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
return 0;
error:
siw_dbg(id->device, "failed: %d\n", rv);
if (cep) {
siw_cep_set_inuse(cep);
if (cep->cm_id) {
cep->cm_id->rem_ref(cep->cm_id);
cep->cm_id = NULL;
}
cep->sock = NULL;
siw_socket_disassoc(s);
cep->state = SIW_EPSTATE_CLOSED;
siw_cep_set_free(cep);
siw_cep_put(cep);
}
sock_release(s);
return rv;
}
static void siw_drop_listeners(struct iw_cm_id *id)
{
struct list_head *p, *tmp;
/*
* In case of a wildcard rdma_listen on a multi-homed device,
* a listener's IWCM id is associated with more than one listening CEP.
*/
list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
list_del(p);
siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
siw_cep_set_inuse(cep);
if (cep->cm_id) {
cep->cm_id->rem_ref(cep->cm_id);
cep->cm_id = NULL;
}
if (cep->sock) {
siw_socket_disassoc(cep->sock);
sock_release(cep->sock);
cep->sock = NULL;
}
cep->state = SIW_EPSTATE_CLOSED;
siw_cep_set_free(cep);
siw_cep_put(cep);
}
}
int siw_destroy_listen(struct iw_cm_id *id)
{
if (!id->provider_data) {
siw_dbg(id->device, "no cep(s)\n");
return 0;
}
siw_drop_listeners(id);
kfree(id->provider_data);
id->provider_data = NULL;
return 0;
}
int siw_cm_init(void)
{
/*
* create_single_workqueue for strict ordering
*/
siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
if (!siw_cm_wq)
return -ENOMEM;
return 0;
}
void siw_cm_exit(void)
{
if (siw_cm_wq) {
flush_workqueue(siw_cm_wq);
destroy_workqueue(siw_cm_wq);
}
}
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