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https://github.com/torvalds/linux
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mptcp: Implement path manager interface commands
Fill in more path manager functionality by adding a worker function and modifying the related stub functions to schedule the worker. Co-developed-by: Florian Westphal <fw@strlen.de> Signed-off-by: Florian Westphal <fw@strlen.de> Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Krystad
David S. Miller
parent
ec3edaa7ca
commit
926bdeab55
132
net/mptcp/pm.c
132
net/mptcp/pm.c
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@ -15,7 +15,11 @@ static struct workqueue_struct *pm_wq;
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int mptcp_pm_announce_addr(struct mptcp_sock *msk,
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const struct mptcp_addr_info *addr)
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{
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return -ENOTSUPP;
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pr_debug("msk=%p, local_id=%d", msk, addr->id);
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msk->pm.local = *addr;
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WRITE_ONCE(msk->pm.addr_signal, true);
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return 0;
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}
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int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id)
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@ -41,13 +45,58 @@ void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side)
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bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk)
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{
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pr_debug("msk=%p", msk);
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return false;
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struct mptcp_pm_data *pm = &msk->pm;
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int ret;
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pr_debug("msk=%p subflows=%d max=%d allow=%d", msk, pm->subflows,
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pm->subflows_max, READ_ONCE(pm->accept_subflow));
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/* try to avoid acquiring the lock below */
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if (!READ_ONCE(pm->accept_subflow))
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return false;
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spin_lock_bh(&pm->lock);
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ret = pm->subflows < pm->subflows_max;
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if (ret && ++pm->subflows == pm->subflows_max)
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WRITE_ONCE(pm->accept_subflow, false);
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spin_unlock_bh(&pm->lock);
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return ret;
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}
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/* return true if the new status bit is currently cleared, that is, this event
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* can be server, eventually by an already scheduled work
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*/
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static bool mptcp_pm_schedule_work(struct mptcp_sock *msk,
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enum mptcp_pm_status new_status)
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{
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pr_debug("msk=%p status=%x new=%lx", msk, msk->pm.status,
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BIT(new_status));
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if (msk->pm.status & BIT(new_status))
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return false;
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msk->pm.status |= BIT(new_status);
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if (queue_work(pm_wq, &msk->pm.work))
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sock_hold((struct sock *)msk);
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return true;
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}
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void mptcp_pm_fully_established(struct mptcp_sock *msk)
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{
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struct mptcp_pm_data *pm = &msk->pm;
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pr_debug("msk=%p", msk);
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/* try to avoid acquiring the lock below */
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if (!READ_ONCE(pm->work_pending))
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return;
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spin_lock_bh(&pm->lock);
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if (READ_ONCE(pm->work_pending))
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mptcp_pm_schedule_work(msk, MPTCP_PM_ESTABLISHED);
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spin_unlock_bh(&pm->lock);
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}
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void mptcp_pm_connection_closed(struct mptcp_sock *msk)
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@ -58,7 +107,19 @@ void mptcp_pm_connection_closed(struct mptcp_sock *msk)
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void mptcp_pm_subflow_established(struct mptcp_sock *msk,
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struct mptcp_subflow_context *subflow)
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{
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struct mptcp_pm_data *pm = &msk->pm;
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pr_debug("msk=%p", msk);
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if (!READ_ONCE(pm->work_pending))
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return;
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spin_lock_bh(&pm->lock);
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if (READ_ONCE(pm->work_pending))
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mptcp_pm_schedule_work(msk, MPTCP_PM_SUBFLOW_ESTABLISHED);
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spin_unlock_bh(&pm->lock);
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}
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void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id)
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@ -69,7 +130,23 @@ void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id)
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void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
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const struct mptcp_addr_info *addr)
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{
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pr_debug("msk=%p, remote_id=%d", msk, addr->id);
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struct mptcp_pm_data *pm = &msk->pm;
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pr_debug("msk=%p remote_id=%d accept=%d", msk, addr->id,
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READ_ONCE(pm->accept_addr));
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/* avoid acquiring the lock if there is no room for fouther addresses */
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if (!READ_ONCE(pm->accept_addr))
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return;
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spin_lock_bh(&pm->lock);
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/* be sure there is something to signal re-checking under PM lock */
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if (READ_ONCE(pm->accept_addr) &&
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mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_RECEIVED))
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pm->remote = *addr;
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spin_unlock_bh(&pm->lock);
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}
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/* path manager helpers */
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@ -77,7 +154,24 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
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bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
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struct mptcp_addr_info *saddr)
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{
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return false;
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int ret = false;
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spin_lock_bh(&msk->pm.lock);
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/* double check after the lock is acquired */
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if (!mptcp_pm_should_signal(msk))
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goto out_unlock;
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if (remaining < mptcp_add_addr_len(msk->pm.local.family))
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goto out_unlock;
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*saddr = msk->pm.local;
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WRITE_ONCE(msk->pm.addr_signal, false);
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ret = true;
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out_unlock:
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spin_unlock_bh(&msk->pm.lock);
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return ret;
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}
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int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
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@ -87,6 +181,28 @@ int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
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static void pm_worker(struct work_struct *work)
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{
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struct mptcp_pm_data *pm = container_of(work, struct mptcp_pm_data,
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work);
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struct mptcp_sock *msk = container_of(pm, struct mptcp_sock, pm);
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struct sock *sk = (struct sock *)msk;
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lock_sock(sk);
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spin_lock_bh(&msk->pm.lock);
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pr_debug("msk=%p status=%x", msk, pm->status);
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if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) {
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pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);
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}
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if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) {
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pm->status &= ~BIT(MPTCP_PM_ESTABLISHED);
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}
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if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) {
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pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED);
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}
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spin_unlock_bh(&msk->pm.lock);
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release_sock(sk);
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sock_put(sk);
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}
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void mptcp_pm_data_init(struct mptcp_sock *msk)
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@ -105,6 +221,12 @@ void mptcp_pm_data_init(struct mptcp_sock *msk)
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INIT_WORK(&msk->pm.work, pm_worker);
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}
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void mptcp_pm_close(struct mptcp_sock *msk)
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{
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if (cancel_work_sync(&msk->pm.work))
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sock_put((struct sock *)msk);
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}
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void mptcp_pm_init(void)
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{
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pm_wq = alloc_workqueue("pm_wq", WQ_UNBOUND | WQ_MEM_RECLAIM, 8);
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@ -833,6 +833,7 @@ static void mptcp_close(struct sock *sk, long timeout)
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}
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mptcp_cancel_work(sk);
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mptcp_pm_close(msk);
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__skb_queue_purge(&sk->sk_receive_queue);
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@ -330,6 +330,7 @@ void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
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void mptcp_pm_init(void);
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void mptcp_pm_data_init(struct mptcp_sock *msk);
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void mptcp_pm_close(struct mptcp_sock *msk);
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void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
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void mptcp_pm_fully_established(struct mptcp_sock *msk);
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bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
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