mirror of
https://github.com/torvalds/linux.git
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12abc5ee78
Add a helper to directly set the TCP_NODELAY sockopt from kernel space without going through a fake uaccess. Cleanup the callers to avoid pointless wrappers now that this is a simple function call. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Sagi Grimberg <sagi@grimberg.me> Acked-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1946 lines
46 KiB
C
1946 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
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/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
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/* Fredy Neeser */
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/* Greg Joyce <greg@opengridcomputing.com> */
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/* Copyright (c) 2008-2019, IBM Corporation */
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/* Copyright (c) 2017, Open Grid Computing, Inc. */
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/net.h>
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#include <linux/inetdevice.h>
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#include <net/addrconf.h>
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#include <linux/workqueue.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <linux/inet.h>
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#include <linux/tcp.h>
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#include <rdma/iw_cm.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_user_verbs.h>
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#include "siw.h"
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#include "siw_cm.h"
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/*
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* Set to any combination of
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* MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
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*/
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static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
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static const bool relaxed_ird_negotiation = true;
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static void siw_cm_llp_state_change(struct sock *s);
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static void siw_cm_llp_data_ready(struct sock *s);
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static void siw_cm_llp_write_space(struct sock *s);
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static void siw_cm_llp_error_report(struct sock *s);
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static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
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int status);
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static void siw_sk_assign_cm_upcalls(struct sock *sk)
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{
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_state_change = siw_cm_llp_state_change;
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sk->sk_data_ready = siw_cm_llp_data_ready;
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sk->sk_write_space = siw_cm_llp_write_space;
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sk->sk_error_report = siw_cm_llp_error_report;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void siw_sk_save_upcalls(struct sock *sk)
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{
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struct siw_cep *cep = sk_to_cep(sk);
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write_lock_bh(&sk->sk_callback_lock);
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cep->sk_state_change = sk->sk_state_change;
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cep->sk_data_ready = sk->sk_data_ready;
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cep->sk_write_space = sk->sk_write_space;
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cep->sk_error_report = sk->sk_error_report;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
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{
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sk->sk_state_change = cep->sk_state_change;
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sk->sk_data_ready = cep->sk_data_ready;
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sk->sk_write_space = cep->sk_write_space;
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sk->sk_error_report = cep->sk_error_report;
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sk->sk_user_data = NULL;
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}
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static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
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{
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struct socket *s = cep->sock;
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struct sock *sk = s->sk;
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write_lock_bh(&sk->sk_callback_lock);
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qp->attrs.sk = s;
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sk->sk_data_ready = siw_qp_llp_data_ready;
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sk->sk_write_space = siw_qp_llp_write_space;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void siw_socket_disassoc(struct socket *s)
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{
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struct sock *sk = s->sk;
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struct siw_cep *cep;
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if (sk) {
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write_lock_bh(&sk->sk_callback_lock);
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cep = sk_to_cep(sk);
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if (cep) {
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siw_sk_restore_upcalls(sk, cep);
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siw_cep_put(cep);
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} else {
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pr_warn("siw: cannot restore sk callbacks: no ep\n");
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}
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write_unlock_bh(&sk->sk_callback_lock);
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} else {
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pr_warn("siw: cannot restore sk callbacks: no sk\n");
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}
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}
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static void siw_rtr_data_ready(struct sock *sk)
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{
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struct siw_cep *cep;
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struct siw_qp *qp = NULL;
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read_descriptor_t rd_desc;
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read_lock(&sk->sk_callback_lock);
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cep = sk_to_cep(sk);
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if (!cep) {
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WARN(1, "No connection endpoint\n");
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goto out;
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}
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qp = sk_to_qp(sk);
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memset(&rd_desc, 0, sizeof(rd_desc));
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rd_desc.arg.data = qp;
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rd_desc.count = 1;
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tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
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/*
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* Check if first frame was successfully processed.
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* Signal connection full establishment if yes.
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* Failed data processing would have already scheduled
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* connection drop.
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*/
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if (!qp->rx_stream.rx_suspend)
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siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
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out:
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read_unlock(&sk->sk_callback_lock);
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if (qp)
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siw_qp_socket_assoc(cep, qp);
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}
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static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
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{
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struct sock *sk = cep->sock->sk;
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_data_ready = siw_rtr_data_ready;
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sk->sk_write_space = siw_qp_llp_write_space;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
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{
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cep->sock = s;
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siw_cep_get(cep);
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s->sk->sk_user_data = cep;
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siw_sk_save_upcalls(s->sk);
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siw_sk_assign_cm_upcalls(s->sk);
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}
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static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
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{
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struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
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unsigned long flags;
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if (!cep)
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return NULL;
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INIT_LIST_HEAD(&cep->listenq);
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INIT_LIST_HEAD(&cep->devq);
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INIT_LIST_HEAD(&cep->work_freelist);
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kref_init(&cep->ref);
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cep->state = SIW_EPSTATE_IDLE;
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init_waitqueue_head(&cep->waitq);
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spin_lock_init(&cep->lock);
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cep->sdev = sdev;
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cep->enhanced_rdma_conn_est = false;
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spin_lock_irqsave(&sdev->lock, flags);
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list_add_tail(&cep->devq, &sdev->cep_list);
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spin_unlock_irqrestore(&sdev->lock, flags);
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siw_dbg_cep(cep, "new endpoint\n");
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return cep;
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}
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static void siw_cm_free_work(struct siw_cep *cep)
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{
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struct list_head *w, *tmp;
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struct siw_cm_work *work;
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list_for_each_safe(w, tmp, &cep->work_freelist) {
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work = list_entry(w, struct siw_cm_work, list);
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list_del(&work->list);
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kfree(work);
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}
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}
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static void siw_cancel_mpatimer(struct siw_cep *cep)
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{
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spin_lock_bh(&cep->lock);
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if (cep->mpa_timer) {
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if (cancel_delayed_work(&cep->mpa_timer->work)) {
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siw_cep_put(cep);
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kfree(cep->mpa_timer); /* not needed again */
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}
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cep->mpa_timer = NULL;
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}
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spin_unlock_bh(&cep->lock);
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}
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static void siw_put_work(struct siw_cm_work *work)
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{
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INIT_LIST_HEAD(&work->list);
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spin_lock_bh(&work->cep->lock);
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list_add(&work->list, &work->cep->work_freelist);
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spin_unlock_bh(&work->cep->lock);
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}
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static void siw_cep_set_inuse(struct siw_cep *cep)
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{
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unsigned long flags;
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retry:
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spin_lock_irqsave(&cep->lock, flags);
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if (cep->in_use) {
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spin_unlock_irqrestore(&cep->lock, flags);
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wait_event_interruptible(cep->waitq, !cep->in_use);
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if (signal_pending(current))
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flush_signals(current);
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goto retry;
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} else {
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cep->in_use = 1;
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spin_unlock_irqrestore(&cep->lock, flags);
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}
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}
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static void siw_cep_set_free(struct siw_cep *cep)
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{
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unsigned long flags;
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spin_lock_irqsave(&cep->lock, flags);
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cep->in_use = 0;
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spin_unlock_irqrestore(&cep->lock, flags);
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wake_up(&cep->waitq);
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}
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static void __siw_cep_dealloc(struct kref *ref)
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{
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struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
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struct siw_device *sdev = cep->sdev;
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unsigned long flags;
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WARN_ON(cep->listen_cep);
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/* kfree(NULL) is safe */
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kfree(cep->mpa.pdata);
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spin_lock_bh(&cep->lock);
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if (!list_empty(&cep->work_freelist))
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siw_cm_free_work(cep);
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spin_unlock_bh(&cep->lock);
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spin_lock_irqsave(&sdev->lock, flags);
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list_del(&cep->devq);
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spin_unlock_irqrestore(&sdev->lock, flags);
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siw_dbg_cep(cep, "free endpoint\n");
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kfree(cep);
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}
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static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
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{
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struct siw_cm_work *work = NULL;
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spin_lock_bh(&cep->lock);
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if (!list_empty(&cep->work_freelist)) {
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work = list_entry(cep->work_freelist.next, struct siw_cm_work,
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list);
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list_del_init(&work->list);
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}
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spin_unlock_bh(&cep->lock);
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return work;
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}
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static int siw_cm_alloc_work(struct siw_cep *cep, int num)
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{
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struct siw_cm_work *work;
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while (num--) {
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work = kmalloc(sizeof(*work), GFP_KERNEL);
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if (!work) {
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if (!(list_empty(&cep->work_freelist)))
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siw_cm_free_work(cep);
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return -ENOMEM;
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}
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work->cep = cep;
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INIT_LIST_HEAD(&work->list);
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list_add(&work->list, &cep->work_freelist);
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}
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return 0;
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}
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/*
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* siw_cm_upcall()
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*
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* Upcall to IWCM to inform about async connection events
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*/
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static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
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int status)
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{
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struct iw_cm_event event;
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struct iw_cm_id *id;
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memset(&event, 0, sizeof(event));
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event.status = status;
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event.event = reason;
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if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
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event.provider_data = cep;
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id = cep->listen_cep->cm_id;
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} else {
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id = cep->cm_id;
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}
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/* Signal IRD and ORD */
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if (reason == IW_CM_EVENT_ESTABLISHED ||
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reason == IW_CM_EVENT_CONNECT_REPLY) {
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/* Signal negotiated IRD/ORD values we will use */
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event.ird = cep->ird;
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event.ord = cep->ord;
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} else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
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event.ird = cep->ord;
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event.ord = cep->ird;
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}
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/* Signal private data and address information */
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if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
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reason == IW_CM_EVENT_CONNECT_REPLY) {
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u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
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if (pd_len) {
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/*
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* hand over MPA private data
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*/
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event.private_data_len = pd_len;
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event.private_data = cep->mpa.pdata;
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/* Hide MPA V2 IRD/ORD control */
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if (cep->enhanced_rdma_conn_est) {
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event.private_data_len -=
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sizeof(struct mpa_v2_data);
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event.private_data +=
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sizeof(struct mpa_v2_data);
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}
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}
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getname_local(cep->sock, &event.local_addr);
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getname_peer(cep->sock, &event.remote_addr);
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}
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siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
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cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
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return id->event_handler(id, &event);
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}
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/*
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* siw_qp_cm_drop()
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*
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* Drops established LLP connection if present and not already
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* scheduled for dropping. Called from user context, SQ workqueue
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* or receive IRQ. Caller signals if socket can be immediately
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* closed (basically, if not in IRQ).
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*/
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void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
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{
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struct siw_cep *cep = qp->cep;
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qp->rx_stream.rx_suspend = 1;
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qp->tx_ctx.tx_suspend = 1;
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if (!qp->cep)
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return;
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if (schedule) {
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siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
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} else {
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siw_cep_set_inuse(cep);
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if (cep->state == SIW_EPSTATE_CLOSED) {
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siw_dbg_cep(cep, "already closed\n");
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goto out;
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}
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siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
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if (qp->term_info.valid)
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siw_send_terminate(qp);
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if (cep->cm_id) {
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switch (cep->state) {
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case SIW_EPSTATE_AWAIT_MPAREP:
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siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
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-EINVAL);
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break;
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case SIW_EPSTATE_RDMA_MODE:
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siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
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break;
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case SIW_EPSTATE_IDLE:
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case SIW_EPSTATE_LISTENING:
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case SIW_EPSTATE_CONNECTING:
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case SIW_EPSTATE_AWAIT_MPAREQ:
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case SIW_EPSTATE_RECVD_MPAREQ:
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case SIW_EPSTATE_CLOSED:
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default:
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break;
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}
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cep->cm_id->rem_ref(cep->cm_id);
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cep->cm_id = NULL;
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siw_cep_put(cep);
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}
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cep->state = SIW_EPSTATE_CLOSED;
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if (cep->sock) {
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siw_socket_disassoc(cep->sock);
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/*
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* Immediately close socket
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*/
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sock_release(cep->sock);
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cep->sock = NULL;
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}
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if (cep->qp) {
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cep->qp = NULL;
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siw_qp_put(qp);
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}
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out:
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siw_cep_set_free(cep);
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}
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}
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void siw_cep_put(struct siw_cep *cep)
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{
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WARN_ON(kref_read(&cep->ref) < 1);
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kref_put(&cep->ref, __siw_cep_dealloc);
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}
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void siw_cep_get(struct siw_cep *cep)
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{
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kref_get(&cep->ref);
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}
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/*
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* Expects params->pd_len in host byte order
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*/
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static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
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{
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struct socket *s = cep->sock;
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struct mpa_rr *rr = &cep->mpa.hdr;
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struct kvec iov[3];
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struct msghdr msg;
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int rv;
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int iovec_num = 0;
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int mpa_len;
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memset(&msg, 0, sizeof(msg));
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iov[iovec_num].iov_base = rr;
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iov[iovec_num].iov_len = sizeof(*rr);
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mpa_len = sizeof(*rr);
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if (cep->enhanced_rdma_conn_est) {
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iovec_num++;
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iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
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iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
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mpa_len += sizeof(cep->mpa.v2_ctrl);
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}
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if (pd_len) {
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iovec_num++;
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iov[iovec_num].iov_base = (char *)pdata;
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iov[iovec_num].iov_len = pd_len;
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mpa_len += pd_len;
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}
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if (cep->enhanced_rdma_conn_est)
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pd_len += sizeof(cep->mpa.v2_ctrl);
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rr->params.pd_len = cpu_to_be16(pd_len);
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rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
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return rv < 0 ? rv : 0;
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}
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/*
|
|
* 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)
|
|
tcp_sock_set_nodelay(new_s->sk);
|
|
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;
|
|
size_t size = laddr->sa_family == AF_INET ?
|
|
sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
|
|
|
|
/*
|
|
* Make address available again asap.
|
|
*/
|
|
sock_set_reuseaddr(s->sk);
|
|
|
|
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)
|
|
tcp_sock_set_nodelay(s->sk);
|
|
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;
|
|
|
|
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.
|
|
*/
|
|
sock_set_reuseaddr(s->sk);
|
|
|
|
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);
|
|
}
|
|
}
|