![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2279 lines
57 KiB
C
2279 lines
57 KiB
C
/* call.c: Rx call routines
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <rxrpc/rxrpc.h>
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#include <rxrpc/transport.h>
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#include <rxrpc/peer.h>
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#include <rxrpc/connection.h>
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#include <rxrpc/call.h>
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#include <rxrpc/message.h>
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#include "internal.h"
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__RXACCT_DECL(atomic_t rxrpc_call_count);
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__RXACCT_DECL(atomic_t rxrpc_message_count);
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LIST_HEAD(rxrpc_calls);
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DECLARE_RWSEM(rxrpc_calls_sem);
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unsigned rxrpc_call_rcv_timeout = HZ/3;
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static unsigned rxrpc_call_acks_timeout = HZ/3;
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static unsigned rxrpc_call_dfr_ack_timeout = HZ/20;
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static unsigned short rxrpc_call_max_resend = HZ/10;
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const char *rxrpc_call_states[] = {
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"COMPLETE",
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"ERROR",
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"SRVR_RCV_OPID",
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"SRVR_RCV_ARGS",
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"SRVR_GOT_ARGS",
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"SRVR_SND_REPLY",
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"SRVR_RCV_FINAL_ACK",
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"CLNT_SND_ARGS",
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"CLNT_RCV_REPLY",
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"CLNT_GOT_REPLY"
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};
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const char *rxrpc_call_error_states[] = {
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"NO_ERROR",
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"LOCAL_ABORT",
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"PEER_ABORT",
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"LOCAL_ERROR",
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"REMOTE_ERROR"
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};
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const char *rxrpc_pkts[] = {
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"?00",
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"data", "ack", "busy", "abort", "ackall", "chall", "resp", "debug",
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"?09", "?10", "?11", "?12", "?13", "?14", "?15"
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};
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static const char *rxrpc_acks[] = {
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"---", "REQ", "DUP", "SEQ", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
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"-?-"
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};
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static const char _acktype[] = "NA-";
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static void rxrpc_call_receive_packet(struct rxrpc_call *call);
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static void rxrpc_call_receive_data_packet(struct rxrpc_call *call,
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struct rxrpc_message *msg);
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static void rxrpc_call_receive_ack_packet(struct rxrpc_call *call,
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struct rxrpc_message *msg);
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static void rxrpc_call_definitively_ACK(struct rxrpc_call *call,
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rxrpc_seq_t higest);
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static void rxrpc_call_resend(struct rxrpc_call *call, rxrpc_seq_t highest);
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static int __rxrpc_call_read_data(struct rxrpc_call *call);
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static int rxrpc_call_record_ACK(struct rxrpc_call *call,
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struct rxrpc_message *msg,
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rxrpc_seq_t seq,
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size_t count);
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static int rxrpc_call_flush(struct rxrpc_call *call);
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#define _state(call) \
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_debug("[[[ state %s ]]]", rxrpc_call_states[call->app_call_state]);
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static void rxrpc_call_default_attn_func(struct rxrpc_call *call)
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{
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wake_up(&call->waitq);
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}
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static void rxrpc_call_default_error_func(struct rxrpc_call *call)
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{
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wake_up(&call->waitq);
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}
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static void rxrpc_call_default_aemap_func(struct rxrpc_call *call)
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{
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switch (call->app_err_state) {
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case RXRPC_ESTATE_LOCAL_ABORT:
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call->app_abort_code = -call->app_errno;
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case RXRPC_ESTATE_PEER_ABORT:
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call->app_errno = -ECONNABORTED;
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default:
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break;
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}
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}
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static void __rxrpc_call_acks_timeout(unsigned long _call)
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{
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struct rxrpc_call *call = (struct rxrpc_call *) _call;
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_debug("ACKS TIMEOUT %05lu", jiffies - call->cjif);
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call->flags |= RXRPC_CALL_ACKS_TIMO;
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rxrpc_krxiod_queue_call(call);
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}
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static void __rxrpc_call_rcv_timeout(unsigned long _call)
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{
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struct rxrpc_call *call = (struct rxrpc_call *) _call;
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_debug("RCV TIMEOUT %05lu", jiffies - call->cjif);
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call->flags |= RXRPC_CALL_RCV_TIMO;
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rxrpc_krxiod_queue_call(call);
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}
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static void __rxrpc_call_ackr_timeout(unsigned long _call)
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{
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struct rxrpc_call *call = (struct rxrpc_call *) _call;
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_debug("ACKR TIMEOUT %05lu",jiffies - call->cjif);
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call->flags |= RXRPC_CALL_ACKR_TIMO;
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rxrpc_krxiod_queue_call(call);
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}
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/*****************************************************************************/
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/*
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* calculate a timeout based on an RTT value
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*/
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static inline unsigned long __rxrpc_rtt_based_timeout(struct rxrpc_call *call,
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unsigned long val)
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{
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unsigned long expiry = call->conn->peer->rtt / (1000000 / HZ);
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expiry += 10;
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if (expiry < HZ / 25)
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expiry = HZ / 25;
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if (expiry > HZ)
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expiry = HZ;
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_leave(" = %lu jiffies", expiry);
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return jiffies + expiry;
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} /* end __rxrpc_rtt_based_timeout() */
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/*****************************************************************************/
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/*
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* create a new call record
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*/
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static inline int __rxrpc_create_call(struct rxrpc_connection *conn,
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struct rxrpc_call **_call)
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{
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struct rxrpc_call *call;
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_enter("%p", conn);
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/* allocate and initialise a call record */
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call = (struct rxrpc_call *) get_zeroed_page(GFP_KERNEL);
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if (!call) {
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_leave(" ENOMEM");
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return -ENOMEM;
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}
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atomic_set(&call->usage, 1);
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init_waitqueue_head(&call->waitq);
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spin_lock_init(&call->lock);
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INIT_LIST_HEAD(&call->link);
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INIT_LIST_HEAD(&call->acks_pendq);
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INIT_LIST_HEAD(&call->rcv_receiveq);
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INIT_LIST_HEAD(&call->rcv_krxiodq_lk);
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INIT_LIST_HEAD(&call->app_readyq);
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INIT_LIST_HEAD(&call->app_unreadyq);
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INIT_LIST_HEAD(&call->app_link);
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INIT_LIST_HEAD(&call->app_attn_link);
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init_timer(&call->acks_timeout);
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call->acks_timeout.data = (unsigned long) call;
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call->acks_timeout.function = __rxrpc_call_acks_timeout;
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init_timer(&call->rcv_timeout);
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call->rcv_timeout.data = (unsigned long) call;
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call->rcv_timeout.function = __rxrpc_call_rcv_timeout;
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init_timer(&call->ackr_dfr_timo);
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call->ackr_dfr_timo.data = (unsigned long) call;
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call->ackr_dfr_timo.function = __rxrpc_call_ackr_timeout;
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call->conn = conn;
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call->ackr_win_bot = 1;
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call->ackr_win_top = call->ackr_win_bot + RXRPC_CALL_ACK_WINDOW_SIZE - 1;
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call->ackr_prev_seq = 0;
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call->app_mark = RXRPC_APP_MARK_EOF;
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call->app_attn_func = rxrpc_call_default_attn_func;
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call->app_error_func = rxrpc_call_default_error_func;
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call->app_aemap_func = rxrpc_call_default_aemap_func;
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call->app_scr_alloc = call->app_scratch;
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call->cjif = jiffies;
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_leave(" = 0 (%p)", call);
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*_call = call;
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return 0;
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} /* end __rxrpc_create_call() */
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/*****************************************************************************/
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/*
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* create a new call record for outgoing calls
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*/
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int rxrpc_create_call(struct rxrpc_connection *conn,
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rxrpc_call_attn_func_t attn,
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rxrpc_call_error_func_t error,
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rxrpc_call_aemap_func_t aemap,
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struct rxrpc_call **_call)
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{
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DECLARE_WAITQUEUE(myself, current);
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struct rxrpc_call *call;
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int ret, cix, loop;
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_enter("%p", conn);
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/* allocate and initialise a call record */
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ret = __rxrpc_create_call(conn, &call);
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if (ret < 0) {
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_leave(" = %d", ret);
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return ret;
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}
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call->app_call_state = RXRPC_CSTATE_CLNT_SND_ARGS;
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if (attn)
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call->app_attn_func = attn;
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if (error)
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call->app_error_func = error;
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if (aemap)
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call->app_aemap_func = aemap;
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_state(call);
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spin_lock(&conn->lock);
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&conn->chanwait, &myself);
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try_again:
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/* try to find an unused channel */
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for (cix = 0; cix < 4; cix++)
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if (!conn->channels[cix])
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goto obtained_chan;
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/* no free channels - wait for one to become available */
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ret = -EINTR;
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if (signal_pending(current))
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goto error_unwait;
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spin_unlock(&conn->lock);
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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spin_lock(&conn->lock);
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goto try_again;
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/* got a channel - now attach to the connection */
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obtained_chan:
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remove_wait_queue(&conn->chanwait, &myself);
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set_current_state(TASK_RUNNING);
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/* concoct a unique call number */
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next_callid:
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call->call_id = htonl(++conn->call_counter);
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for (loop = 0; loop < 4; loop++)
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if (conn->channels[loop] &&
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conn->channels[loop]->call_id == call->call_id)
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goto next_callid;
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rxrpc_get_connection(conn);
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conn->channels[cix] = call; /* assign _after_ done callid check loop */
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do_gettimeofday(&conn->atime);
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call->chan_ix = htonl(cix);
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spin_unlock(&conn->lock);
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down_write(&rxrpc_calls_sem);
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list_add_tail(&call->call_link, &rxrpc_calls);
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up_write(&rxrpc_calls_sem);
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__RXACCT(atomic_inc(&rxrpc_call_count));
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*_call = call;
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_leave(" = 0 (call=%p cix=%u)", call, cix);
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return 0;
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error_unwait:
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remove_wait_queue(&conn->chanwait, &myself);
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set_current_state(TASK_RUNNING);
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spin_unlock(&conn->lock);
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free_page((unsigned long) call);
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_leave(" = %d", ret);
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return ret;
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} /* end rxrpc_create_call() */
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/*****************************************************************************/
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/*
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* create a new call record for incoming calls
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*/
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int rxrpc_incoming_call(struct rxrpc_connection *conn,
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struct rxrpc_message *msg,
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struct rxrpc_call **_call)
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{
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struct rxrpc_call *call;
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unsigned cix;
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int ret;
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cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
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_enter("%p,%u,%u", conn, ntohl(msg->hdr.callNumber), cix);
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/* allocate and initialise a call record */
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ret = __rxrpc_create_call(conn, &call);
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if (ret < 0) {
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_leave(" = %d", ret);
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return ret;
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}
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call->pkt_rcv_count = 1;
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call->app_call_state = RXRPC_CSTATE_SRVR_RCV_OPID;
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call->app_mark = sizeof(uint32_t);
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_state(call);
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/* attach to the connection */
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ret = -EBUSY;
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call->chan_ix = htonl(cix);
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call->call_id = msg->hdr.callNumber;
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spin_lock(&conn->lock);
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if (!conn->channels[cix] ||
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conn->channels[cix]->app_call_state == RXRPC_CSTATE_COMPLETE ||
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conn->channels[cix]->app_call_state == RXRPC_CSTATE_ERROR
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) {
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conn->channels[cix] = call;
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rxrpc_get_connection(conn);
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ret = 0;
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}
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spin_unlock(&conn->lock);
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if (ret < 0) {
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free_page((unsigned long) call);
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call = NULL;
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}
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if (ret == 0) {
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down_write(&rxrpc_calls_sem);
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list_add_tail(&call->call_link, &rxrpc_calls);
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up_write(&rxrpc_calls_sem);
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__RXACCT(atomic_inc(&rxrpc_call_count));
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*_call = call;
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}
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_leave(" = %d [%p]", ret, call);
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return ret;
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} /* end rxrpc_incoming_call() */
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/*****************************************************************************/
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/*
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* free a call record
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*/
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void rxrpc_put_call(struct rxrpc_call *call)
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{
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struct rxrpc_connection *conn = call->conn;
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struct rxrpc_message *msg;
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_enter("%p{u=%d}",call,atomic_read(&call->usage));
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/* sanity check */
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if (atomic_read(&call->usage) <= 0)
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BUG();
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/* to prevent a race, the decrement and the de-list must be effectively
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* atomic */
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spin_lock(&conn->lock);
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if (likely(!atomic_dec_and_test(&call->usage))) {
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spin_unlock(&conn->lock);
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_leave("");
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return;
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}
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if (conn->channels[ntohl(call->chan_ix)] == call)
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conn->channels[ntohl(call->chan_ix)] = NULL;
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spin_unlock(&conn->lock);
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wake_up(&conn->chanwait);
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rxrpc_put_connection(conn);
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/* clear the timers and dequeue from krxiod */
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del_timer_sync(&call->acks_timeout);
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del_timer_sync(&call->rcv_timeout);
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del_timer_sync(&call->ackr_dfr_timo);
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rxrpc_krxiod_dequeue_call(call);
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/* clean up the contents of the struct */
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if (call->snd_nextmsg)
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rxrpc_put_message(call->snd_nextmsg);
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if (call->snd_ping)
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rxrpc_put_message(call->snd_ping);
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while (!list_empty(&call->acks_pendq)) {
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msg = list_entry(call->acks_pendq.next,
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struct rxrpc_message, link);
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list_del(&msg->link);
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rxrpc_put_message(msg);
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}
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while (!list_empty(&call->rcv_receiveq)) {
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msg = list_entry(call->rcv_receiveq.next,
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struct rxrpc_message, link);
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list_del(&msg->link);
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rxrpc_put_message(msg);
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}
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while (!list_empty(&call->app_readyq)) {
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msg = list_entry(call->app_readyq.next,
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struct rxrpc_message, link);
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list_del(&msg->link);
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rxrpc_put_message(msg);
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}
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while (!list_empty(&call->app_unreadyq)) {
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msg = list_entry(call->app_unreadyq.next,
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struct rxrpc_message, link);
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list_del(&msg->link);
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rxrpc_put_message(msg);
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}
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module_put(call->owner);
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down_write(&rxrpc_calls_sem);
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list_del(&call->call_link);
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up_write(&rxrpc_calls_sem);
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__RXACCT(atomic_dec(&rxrpc_call_count));
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free_page((unsigned long) call);
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_leave(" [destroyed]");
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} /* end rxrpc_put_call() */
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|
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/*****************************************************************************/
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/*
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* actually generate a normal ACK
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*/
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static inline int __rxrpc_call_gen_normal_ACK(struct rxrpc_call *call,
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rxrpc_seq_t seq)
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{
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struct rxrpc_message *msg;
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struct kvec diov[3];
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__be32 aux[4];
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int delta, ret;
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|
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/* ACKs default to DELAY */
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if (!call->ackr.reason)
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call->ackr.reason = RXRPC_ACK_DELAY;
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_proto("Rx %05lu Sending ACK { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
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jiffies - call->cjif,
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ntohs(call->ackr.maxSkew),
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ntohl(call->ackr.firstPacket),
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ntohl(call->ackr.previousPacket),
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ntohl(call->ackr.serial),
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rxrpc_acks[call->ackr.reason],
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call->ackr.nAcks);
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aux[0] = htonl(call->conn->peer->if_mtu); /* interface MTU */
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aux[1] = htonl(1444); /* max MTU */
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aux[2] = htonl(16); /* rwind */
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aux[3] = htonl(4); /* max packets */
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|
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diov[0].iov_len = sizeof(struct rxrpc_ackpacket);
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diov[0].iov_base = &call->ackr;
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diov[1].iov_len = call->ackr_pend_cnt + 3;
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diov[1].iov_base = call->ackr_array;
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diov[2].iov_len = sizeof(aux);
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diov[2].iov_base = &aux;
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|
|
/* build and send the message */
|
|
ret = rxrpc_conn_newmsg(call->conn,call, RXRPC_PACKET_TYPE_ACK,
|
|
3, diov, GFP_KERNEL, &msg);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
msg->seq = seq;
|
|
msg->hdr.seq = htonl(seq);
|
|
msg->hdr.flags |= RXRPC_SLOW_START_OK;
|
|
|
|
ret = rxrpc_conn_sendmsg(call->conn, msg);
|
|
rxrpc_put_message(msg);
|
|
if (ret < 0)
|
|
goto out;
|
|
call->pkt_snd_count++;
|
|
|
|
/* count how many actual ACKs there were at the front */
|
|
for (delta = 0; delta < call->ackr_pend_cnt; delta++)
|
|
if (call->ackr_array[delta] != RXRPC_ACK_TYPE_ACK)
|
|
break;
|
|
|
|
call->ackr_pend_cnt -= delta; /* all ACK'd to this point */
|
|
|
|
/* crank the ACK window around */
|
|
if (delta == 0) {
|
|
/* un-ACK'd window */
|
|
}
|
|
else if (delta < RXRPC_CALL_ACK_WINDOW_SIZE) {
|
|
/* partially ACK'd window
|
|
* - shuffle down to avoid losing out-of-sequence packets
|
|
*/
|
|
call->ackr_win_bot += delta;
|
|
call->ackr_win_top += delta;
|
|
|
|
memmove(&call->ackr_array[0],
|
|
&call->ackr_array[delta],
|
|
call->ackr_pend_cnt);
|
|
|
|
memset(&call->ackr_array[call->ackr_pend_cnt],
|
|
RXRPC_ACK_TYPE_NACK,
|
|
sizeof(call->ackr_array) - call->ackr_pend_cnt);
|
|
}
|
|
else {
|
|
/* fully ACK'd window
|
|
* - just clear the whole thing
|
|
*/
|
|
memset(&call->ackr_array,
|
|
RXRPC_ACK_TYPE_NACK,
|
|
sizeof(call->ackr_array));
|
|
}
|
|
|
|
/* clear this ACK */
|
|
memset(&call->ackr, 0, sizeof(call->ackr));
|
|
|
|
out:
|
|
if (!call->app_call_state)
|
|
printk("___ STATE 0 ___\n");
|
|
return ret;
|
|
} /* end __rxrpc_call_gen_normal_ACK() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* note the reception of a packet in the call's ACK records and generate an
|
|
* appropriate ACK packet if necessary
|
|
* - returns 0 if packet should be processed, 1 if packet should be ignored
|
|
* and -ve on an error
|
|
*/
|
|
static int rxrpc_call_generate_ACK(struct rxrpc_call *call,
|
|
struct rxrpc_header *hdr,
|
|
struct rxrpc_ackpacket *ack)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
rxrpc_seq_t seq;
|
|
unsigned offset;
|
|
int ret = 0, err;
|
|
u8 special_ACK, do_ACK, force;
|
|
|
|
_enter("%p,%p { seq=%d tp=%d fl=%02x }",
|
|
call, hdr, ntohl(hdr->seq), hdr->type, hdr->flags);
|
|
|
|
seq = ntohl(hdr->seq);
|
|
offset = seq - call->ackr_win_bot;
|
|
do_ACK = RXRPC_ACK_DELAY;
|
|
special_ACK = 0;
|
|
force = (seq == 1);
|
|
|
|
if (call->ackr_high_seq < seq)
|
|
call->ackr_high_seq = seq;
|
|
|
|
/* deal with generation of obvious special ACKs first */
|
|
if (ack && ack->reason == RXRPC_ACK_PING) {
|
|
special_ACK = RXRPC_ACK_PING_RESPONSE;
|
|
ret = 1;
|
|
goto gen_ACK;
|
|
}
|
|
|
|
if (seq < call->ackr_win_bot) {
|
|
special_ACK = RXRPC_ACK_DUPLICATE;
|
|
ret = 1;
|
|
goto gen_ACK;
|
|
}
|
|
|
|
if (seq >= call->ackr_win_top) {
|
|
special_ACK = RXRPC_ACK_EXCEEDS_WINDOW;
|
|
ret = 1;
|
|
goto gen_ACK;
|
|
}
|
|
|
|
if (call->ackr_array[offset] != RXRPC_ACK_TYPE_NACK) {
|
|
special_ACK = RXRPC_ACK_DUPLICATE;
|
|
ret = 1;
|
|
goto gen_ACK;
|
|
}
|
|
|
|
/* okay... it's a normal data packet inside the ACK window */
|
|
call->ackr_array[offset] = RXRPC_ACK_TYPE_ACK;
|
|
|
|
if (offset < call->ackr_pend_cnt) {
|
|
}
|
|
else if (offset > call->ackr_pend_cnt) {
|
|
do_ACK = RXRPC_ACK_OUT_OF_SEQUENCE;
|
|
call->ackr_pend_cnt = offset;
|
|
goto gen_ACK;
|
|
}
|
|
|
|
if (hdr->flags & RXRPC_REQUEST_ACK) {
|
|
do_ACK = RXRPC_ACK_REQUESTED;
|
|
}
|
|
|
|
/* generate an ACK on the final packet of a reply just received */
|
|
if (hdr->flags & RXRPC_LAST_PACKET) {
|
|
if (call->conn->out_clientflag)
|
|
force = 1;
|
|
}
|
|
else if (!(hdr->flags & RXRPC_MORE_PACKETS)) {
|
|
do_ACK = RXRPC_ACK_REQUESTED;
|
|
}
|
|
|
|
/* re-ACK packets previously received out-of-order */
|
|
for (offset++; offset < RXRPC_CALL_ACK_WINDOW_SIZE; offset++)
|
|
if (call->ackr_array[offset] != RXRPC_ACK_TYPE_ACK)
|
|
break;
|
|
|
|
call->ackr_pend_cnt = offset;
|
|
|
|
/* generate an ACK if we fill up the window */
|
|
if (call->ackr_pend_cnt >= RXRPC_CALL_ACK_WINDOW_SIZE)
|
|
force = 1;
|
|
|
|
gen_ACK:
|
|
_debug("%05lu ACKs pend=%u norm=%s special=%s%s",
|
|
jiffies - call->cjif,
|
|
call->ackr_pend_cnt,
|
|
rxrpc_acks[do_ACK],
|
|
rxrpc_acks[special_ACK],
|
|
force ? " immediate" :
|
|
do_ACK == RXRPC_ACK_REQUESTED ? " merge-req" :
|
|
hdr->flags & RXRPC_LAST_PACKET ? " finalise" :
|
|
" defer"
|
|
);
|
|
|
|
/* send any pending normal ACKs if need be */
|
|
if (call->ackr_pend_cnt > 0) {
|
|
/* fill out the appropriate form */
|
|
call->ackr.bufferSpace = htons(RXRPC_CALL_ACK_WINDOW_SIZE);
|
|
call->ackr.maxSkew = htons(min(call->ackr_high_seq - seq,
|
|
65535U));
|
|
call->ackr.firstPacket = htonl(call->ackr_win_bot);
|
|
call->ackr.previousPacket = call->ackr_prev_seq;
|
|
call->ackr.serial = hdr->serial;
|
|
call->ackr.nAcks = call->ackr_pend_cnt;
|
|
|
|
if (do_ACK == RXRPC_ACK_REQUESTED)
|
|
call->ackr.reason = do_ACK;
|
|
|
|
/* generate the ACK immediately if necessary */
|
|
if (special_ACK || force) {
|
|
err = __rxrpc_call_gen_normal_ACK(
|
|
call, do_ACK == RXRPC_ACK_DELAY ? 0 : seq);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (call->ackr.reason == RXRPC_ACK_REQUESTED)
|
|
call->ackr_dfr_seq = seq;
|
|
|
|
/* start the ACK timer if not running if there are any pending deferred
|
|
* ACKs */
|
|
if (call->ackr_pend_cnt > 0 &&
|
|
call->ackr.reason != RXRPC_ACK_REQUESTED &&
|
|
!timer_pending(&call->ackr_dfr_timo)
|
|
) {
|
|
unsigned long timo;
|
|
|
|
timo = rxrpc_call_dfr_ack_timeout + jiffies;
|
|
|
|
_debug("START ACKR TIMER for cj=%lu", timo - call->cjif);
|
|
|
|
spin_lock(&call->lock);
|
|
mod_timer(&call->ackr_dfr_timo, timo);
|
|
spin_unlock(&call->lock);
|
|
}
|
|
else if ((call->ackr_pend_cnt == 0 ||
|
|
call->ackr.reason == RXRPC_ACK_REQUESTED) &&
|
|
timer_pending(&call->ackr_dfr_timo)
|
|
) {
|
|
/* stop timer if no pending ACKs */
|
|
_debug("CLEAR ACKR TIMER");
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
}
|
|
|
|
/* send a special ACK if one is required */
|
|
if (special_ACK) {
|
|
struct rxrpc_ackpacket ack;
|
|
struct kvec diov[2];
|
|
uint8_t acks[1] = { RXRPC_ACK_TYPE_ACK };
|
|
|
|
/* fill out the appropriate form */
|
|
ack.bufferSpace = htons(RXRPC_CALL_ACK_WINDOW_SIZE);
|
|
ack.maxSkew = htons(min(call->ackr_high_seq - seq,
|
|
65535U));
|
|
ack.firstPacket = htonl(call->ackr_win_bot);
|
|
ack.previousPacket = call->ackr_prev_seq;
|
|
ack.serial = hdr->serial;
|
|
ack.reason = special_ACK;
|
|
ack.nAcks = 0;
|
|
|
|
_proto("Rx Sending s-ACK"
|
|
" { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
|
|
ntohs(ack.maxSkew),
|
|
ntohl(ack.firstPacket),
|
|
ntohl(ack.previousPacket),
|
|
ntohl(ack.serial),
|
|
rxrpc_acks[ack.reason],
|
|
ack.nAcks);
|
|
|
|
diov[0].iov_len = sizeof(struct rxrpc_ackpacket);
|
|
diov[0].iov_base = &ack;
|
|
diov[1].iov_len = sizeof(acks);
|
|
diov[1].iov_base = acks;
|
|
|
|
/* build and send the message */
|
|
err = rxrpc_conn_newmsg(call->conn,call, RXRPC_PACKET_TYPE_ACK,
|
|
hdr->seq ? 2 : 1, diov,
|
|
GFP_KERNEL,
|
|
&msg);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out;
|
|
}
|
|
|
|
msg->seq = seq;
|
|
msg->hdr.seq = htonl(seq);
|
|
msg->hdr.flags |= RXRPC_SLOW_START_OK;
|
|
|
|
err = rxrpc_conn_sendmsg(call->conn, msg);
|
|
rxrpc_put_message(msg);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out;
|
|
}
|
|
call->pkt_snd_count++;
|
|
}
|
|
|
|
out:
|
|
if (hdr->seq)
|
|
call->ackr_prev_seq = hdr->seq;
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
} /* end rxrpc_call_generate_ACK() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* handle work to be done on a call
|
|
* - includes packet reception and timeout processing
|
|
*/
|
|
void rxrpc_call_do_stuff(struct rxrpc_call *call)
|
|
{
|
|
_enter("%p{flags=%lx}", call, call->flags);
|
|
|
|
/* handle packet reception */
|
|
if (call->flags & RXRPC_CALL_RCV_PKT) {
|
|
_debug("- receive packet");
|
|
call->flags &= ~RXRPC_CALL_RCV_PKT;
|
|
rxrpc_call_receive_packet(call);
|
|
}
|
|
|
|
/* handle overdue ACKs */
|
|
if (call->flags & RXRPC_CALL_ACKS_TIMO) {
|
|
_debug("- overdue ACK timeout");
|
|
call->flags &= ~RXRPC_CALL_ACKS_TIMO;
|
|
rxrpc_call_resend(call, call->snd_seq_count);
|
|
}
|
|
|
|
/* handle lack of reception */
|
|
if (call->flags & RXRPC_CALL_RCV_TIMO) {
|
|
_debug("- reception timeout");
|
|
call->flags &= ~RXRPC_CALL_RCV_TIMO;
|
|
rxrpc_call_abort(call, -EIO);
|
|
}
|
|
|
|
/* handle deferred ACKs */
|
|
if (call->flags & RXRPC_CALL_ACKR_TIMO ||
|
|
(call->ackr.nAcks > 0 && call->ackr.reason == RXRPC_ACK_REQUESTED)
|
|
) {
|
|
_debug("- deferred ACK timeout: cj=%05lu r=%s n=%u",
|
|
jiffies - call->cjif,
|
|
rxrpc_acks[call->ackr.reason],
|
|
call->ackr.nAcks);
|
|
|
|
call->flags &= ~RXRPC_CALL_ACKR_TIMO;
|
|
|
|
if (call->ackr.nAcks > 0 &&
|
|
call->app_call_state != RXRPC_CSTATE_ERROR) {
|
|
/* generate ACK */
|
|
__rxrpc_call_gen_normal_ACK(call, call->ackr_dfr_seq);
|
|
call->ackr_dfr_seq = 0;
|
|
}
|
|
}
|
|
|
|
_leave("");
|
|
|
|
} /* end rxrpc_call_do_stuff() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* send an abort message at call or connection level
|
|
* - must be called with call->lock held
|
|
* - the supplied error code is sent as the packet data
|
|
*/
|
|
static int __rxrpc_call_abort(struct rxrpc_call *call, int errno)
|
|
{
|
|
struct rxrpc_connection *conn = call->conn;
|
|
struct rxrpc_message *msg;
|
|
struct kvec diov[1];
|
|
int ret;
|
|
__be32 _error;
|
|
|
|
_enter("%p{%08x},%p{%d},%d",
|
|
conn, ntohl(conn->conn_id), call, ntohl(call->call_id), errno);
|
|
|
|
/* if this call is already aborted, then just wake up any waiters */
|
|
if (call->app_call_state == RXRPC_CSTATE_ERROR) {
|
|
spin_unlock(&call->lock);
|
|
call->app_error_func(call);
|
|
_leave(" = 0");
|
|
return 0;
|
|
}
|
|
|
|
rxrpc_get_call(call);
|
|
|
|
/* change the state _with_ the lock still held */
|
|
call->app_call_state = RXRPC_CSTATE_ERROR;
|
|
call->app_err_state = RXRPC_ESTATE_LOCAL_ABORT;
|
|
call->app_errno = errno;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
call->app_read_buf = NULL;
|
|
call->app_async_read = 0;
|
|
|
|
_state(call);
|
|
|
|
/* ask the app to translate the error code */
|
|
call->app_aemap_func(call);
|
|
|
|
spin_unlock(&call->lock);
|
|
|
|
/* flush any outstanding ACKs */
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
|
|
if (rxrpc_call_is_ack_pending(call))
|
|
__rxrpc_call_gen_normal_ACK(call, 0);
|
|
|
|
/* send the abort packet only if we actually traded some other
|
|
* packets */
|
|
ret = 0;
|
|
if (call->pkt_snd_count || call->pkt_rcv_count) {
|
|
/* actually send the abort */
|
|
_proto("Rx Sending Call ABORT { data=%d }",
|
|
call->app_abort_code);
|
|
|
|
_error = htonl(call->app_abort_code);
|
|
|
|
diov[0].iov_len = sizeof(_error);
|
|
diov[0].iov_base = &_error;
|
|
|
|
ret = rxrpc_conn_newmsg(conn, call, RXRPC_PACKET_TYPE_ABORT,
|
|
1, diov, GFP_KERNEL, &msg);
|
|
if (ret == 0) {
|
|
ret = rxrpc_conn_sendmsg(conn, msg);
|
|
rxrpc_put_message(msg);
|
|
}
|
|
}
|
|
|
|
/* tell the app layer to let go */
|
|
call->app_error_func(call);
|
|
|
|
rxrpc_put_call(call);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
} /* end __rxrpc_call_abort() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* send an abort message at call or connection level
|
|
* - the supplied error code is sent as the packet data
|
|
*/
|
|
int rxrpc_call_abort(struct rxrpc_call *call, int error)
|
|
{
|
|
spin_lock(&call->lock);
|
|
|
|
return __rxrpc_call_abort(call, error);
|
|
|
|
} /* end rxrpc_call_abort() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* process packets waiting for this call
|
|
*/
|
|
static void rxrpc_call_receive_packet(struct rxrpc_call *call)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
struct list_head *_p;
|
|
|
|
_enter("%p", call);
|
|
|
|
rxrpc_get_call(call); /* must not go away too soon if aborted by
|
|
* app-layer */
|
|
|
|
while (!list_empty(&call->rcv_receiveq)) {
|
|
/* try to get next packet */
|
|
_p = NULL;
|
|
spin_lock(&call->lock);
|
|
if (!list_empty(&call->rcv_receiveq)) {
|
|
_p = call->rcv_receiveq.next;
|
|
list_del_init(_p);
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
if (!_p)
|
|
break;
|
|
|
|
msg = list_entry(_p, struct rxrpc_message, link);
|
|
|
|
_proto("Rx %05lu Received %s packet (%%%u,#%u,%c%c%c%c%c)",
|
|
jiffies - call->cjif,
|
|
rxrpc_pkts[msg->hdr.type],
|
|
ntohl(msg->hdr.serial),
|
|
msg->seq,
|
|
msg->hdr.flags & RXRPC_JUMBO_PACKET ? 'j' : '-',
|
|
msg->hdr.flags & RXRPC_MORE_PACKETS ? 'm' : '-',
|
|
msg->hdr.flags & RXRPC_LAST_PACKET ? 'l' : '-',
|
|
msg->hdr.flags & RXRPC_REQUEST_ACK ? 'r' : '-',
|
|
msg->hdr.flags & RXRPC_CLIENT_INITIATED ? 'C' : 'S'
|
|
);
|
|
|
|
switch (msg->hdr.type) {
|
|
/* deal with data packets */
|
|
case RXRPC_PACKET_TYPE_DATA:
|
|
/* ACK the packet if necessary */
|
|
switch (rxrpc_call_generate_ACK(call, &msg->hdr,
|
|
NULL)) {
|
|
case 0: /* useful packet */
|
|
rxrpc_call_receive_data_packet(call, msg);
|
|
break;
|
|
case 1: /* duplicate or out-of-window packet */
|
|
break;
|
|
default:
|
|
rxrpc_put_message(msg);
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
/* deal with ACK packets */
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
rxrpc_call_receive_ack_packet(call, msg);
|
|
break;
|
|
|
|
/* deal with abort packets */
|
|
case RXRPC_PACKET_TYPE_ABORT: {
|
|
__be32 _dbuf, *dp;
|
|
|
|
dp = skb_header_pointer(msg->pkt, msg->offset,
|
|
sizeof(_dbuf), &_dbuf);
|
|
if (dp == NULL)
|
|
printk("Rx Received short ABORT packet\n");
|
|
|
|
_proto("Rx Received Call ABORT { data=%d }",
|
|
(dp ? ntohl(*dp) : 0));
|
|
|
|
spin_lock(&call->lock);
|
|
call->app_call_state = RXRPC_CSTATE_ERROR;
|
|
call->app_err_state = RXRPC_ESTATE_PEER_ABORT;
|
|
call->app_abort_code = (dp ? ntohl(*dp) : 0);
|
|
call->app_errno = -ECONNABORTED;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
call->app_read_buf = NULL;
|
|
call->app_async_read = 0;
|
|
|
|
/* ask the app to translate the error code */
|
|
call->app_aemap_func(call);
|
|
_state(call);
|
|
spin_unlock(&call->lock);
|
|
call->app_error_func(call);
|
|
break;
|
|
}
|
|
default:
|
|
/* deal with other packet types */
|
|
_proto("Rx Unsupported packet type %u (#%u)",
|
|
msg->hdr.type, msg->seq);
|
|
break;
|
|
}
|
|
|
|
rxrpc_put_message(msg);
|
|
}
|
|
|
|
out:
|
|
rxrpc_put_call(call);
|
|
_leave("");
|
|
} /* end rxrpc_call_receive_packet() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* process next data packet
|
|
* - as the next data packet arrives:
|
|
* - it is queued on app_readyq _if_ it is the next one expected
|
|
* (app_ready_seq+1)
|
|
* - it is queued on app_unreadyq _if_ it is not the next one expected
|
|
* - if a packet placed on app_readyq completely fills a hole leading up to
|
|
* the first packet on app_unreadyq, then packets now in sequence are
|
|
* tranferred to app_readyq
|
|
* - the application layer can only see packets on app_readyq
|
|
* (app_ready_qty bytes)
|
|
* - the application layer is prodded every time a new packet arrives
|
|
*/
|
|
static void rxrpc_call_receive_data_packet(struct rxrpc_call *call,
|
|
struct rxrpc_message *msg)
|
|
{
|
|
const struct rxrpc_operation *optbl, *op;
|
|
struct rxrpc_message *pmsg;
|
|
struct list_head *_p;
|
|
int ret, lo, hi, rmtimo;
|
|
__be32 opid;
|
|
|
|
_enter("%p{%u},%p{%u}", call, ntohl(call->call_id), msg, msg->seq);
|
|
|
|
rxrpc_get_message(msg);
|
|
|
|
/* add to the unready queue if we'd have to create a hole in the ready
|
|
* queue otherwise */
|
|
if (msg->seq != call->app_ready_seq + 1) {
|
|
_debug("Call add packet %d to unreadyq", msg->seq);
|
|
|
|
/* insert in seq order */
|
|
list_for_each(_p, &call->app_unreadyq) {
|
|
pmsg = list_entry(_p, struct rxrpc_message, link);
|
|
if (pmsg->seq > msg->seq)
|
|
break;
|
|
}
|
|
|
|
list_add_tail(&msg->link, _p);
|
|
|
|
_leave(" [unreadyq]");
|
|
return;
|
|
}
|
|
|
|
/* next in sequence - simply append into the call's ready queue */
|
|
_debug("Call add packet %d to readyq (+%Zd => %Zd bytes)",
|
|
msg->seq, msg->dsize, call->app_ready_qty);
|
|
|
|
spin_lock(&call->lock);
|
|
call->app_ready_seq = msg->seq;
|
|
call->app_ready_qty += msg->dsize;
|
|
list_add_tail(&msg->link, &call->app_readyq);
|
|
|
|
/* move unready packets to the readyq if we got rid of a hole */
|
|
while (!list_empty(&call->app_unreadyq)) {
|
|
pmsg = list_entry(call->app_unreadyq.next,
|
|
struct rxrpc_message, link);
|
|
|
|
if (pmsg->seq != call->app_ready_seq + 1)
|
|
break;
|
|
|
|
/* next in sequence - just move list-to-list */
|
|
_debug("Call transfer packet %d to readyq (+%Zd => %Zd bytes)",
|
|
pmsg->seq, pmsg->dsize, call->app_ready_qty);
|
|
|
|
call->app_ready_seq = pmsg->seq;
|
|
call->app_ready_qty += pmsg->dsize;
|
|
list_del_init(&pmsg->link);
|
|
list_add_tail(&pmsg->link, &call->app_readyq);
|
|
}
|
|
|
|
/* see if we've got the last packet yet */
|
|
if (!list_empty(&call->app_readyq)) {
|
|
pmsg = list_entry(call->app_readyq.prev,
|
|
struct rxrpc_message, link);
|
|
if (pmsg->hdr.flags & RXRPC_LAST_PACKET) {
|
|
call->app_last_rcv = 1;
|
|
_debug("Last packet on readyq");
|
|
}
|
|
}
|
|
|
|
switch (call->app_call_state) {
|
|
/* do nothing if call already aborted */
|
|
case RXRPC_CSTATE_ERROR:
|
|
spin_unlock(&call->lock);
|
|
_leave(" [error]");
|
|
return;
|
|
|
|
/* extract the operation ID from an incoming call if that's not
|
|
* yet been done */
|
|
case RXRPC_CSTATE_SRVR_RCV_OPID:
|
|
spin_unlock(&call->lock);
|
|
|
|
/* handle as yet insufficient data for the operation ID */
|
|
if (call->app_ready_qty < 4) {
|
|
if (call->app_last_rcv)
|
|
/* trouble - last packet seen */
|
|
rxrpc_call_abort(call, -EINVAL);
|
|
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
/* pull the operation ID out of the buffer */
|
|
ret = rxrpc_call_read_data(call, &opid, sizeof(opid), 0);
|
|
if (ret < 0) {
|
|
printk("Unexpected error from read-data: %d\n", ret);
|
|
if (call->app_call_state != RXRPC_CSTATE_ERROR)
|
|
rxrpc_call_abort(call, ret);
|
|
_leave("");
|
|
return;
|
|
}
|
|
call->app_opcode = ntohl(opid);
|
|
|
|
/* locate the operation in the available ops table */
|
|
optbl = call->conn->service->ops_begin;
|
|
lo = 0;
|
|
hi = call->conn->service->ops_end - optbl;
|
|
|
|
while (lo < hi) {
|
|
int mid = (hi + lo) / 2;
|
|
op = &optbl[mid];
|
|
if (call->app_opcode == op->id)
|
|
goto found_op;
|
|
if (call->app_opcode > op->id)
|
|
lo = mid + 1;
|
|
else
|
|
hi = mid;
|
|
}
|
|
|
|
/* search failed */
|
|
kproto("Rx Client requested operation %d from %s service",
|
|
call->app_opcode, call->conn->service->name);
|
|
rxrpc_call_abort(call, -EINVAL);
|
|
_leave(" [inval]");
|
|
return;
|
|
|
|
found_op:
|
|
_proto("Rx Client requested operation %s from %s service",
|
|
op->name, call->conn->service->name);
|
|
|
|
/* we're now waiting for the argument block (unless the call
|
|
* was aborted) */
|
|
spin_lock(&call->lock);
|
|
if (call->app_call_state == RXRPC_CSTATE_SRVR_RCV_OPID ||
|
|
call->app_call_state == RXRPC_CSTATE_SRVR_SND_REPLY) {
|
|
if (!call->app_last_rcv)
|
|
call->app_call_state =
|
|
RXRPC_CSTATE_SRVR_RCV_ARGS;
|
|
else if (call->app_ready_qty > 0)
|
|
call->app_call_state =
|
|
RXRPC_CSTATE_SRVR_GOT_ARGS;
|
|
else
|
|
call->app_call_state =
|
|
RXRPC_CSTATE_SRVR_SND_REPLY;
|
|
call->app_mark = op->asize;
|
|
call->app_user = op->user;
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
_state(call);
|
|
break;
|
|
|
|
case RXRPC_CSTATE_SRVR_RCV_ARGS:
|
|
/* change state if just received last packet of arg block */
|
|
if (call->app_last_rcv)
|
|
call->app_call_state = RXRPC_CSTATE_SRVR_GOT_ARGS;
|
|
spin_unlock(&call->lock);
|
|
|
|
_state(call);
|
|
break;
|
|
|
|
case RXRPC_CSTATE_CLNT_RCV_REPLY:
|
|
/* change state if just received last packet of reply block */
|
|
rmtimo = 0;
|
|
if (call->app_last_rcv) {
|
|
call->app_call_state = RXRPC_CSTATE_CLNT_GOT_REPLY;
|
|
rmtimo = 1;
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
if (rmtimo) {
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
}
|
|
|
|
_state(call);
|
|
break;
|
|
|
|
default:
|
|
/* deal with data reception in an unexpected state */
|
|
printk("Unexpected state [[[ %u ]]]\n", call->app_call_state);
|
|
__rxrpc_call_abort(call, -EBADMSG);
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
if (call->app_call_state == RXRPC_CSTATE_CLNT_RCV_REPLY &&
|
|
call->app_last_rcv)
|
|
BUG();
|
|
|
|
/* otherwise just invoke the data function whenever we can satisfy its desire for more
|
|
* data
|
|
*/
|
|
_proto("Rx Received Op Data: st=%u qty=%Zu mk=%Zu%s",
|
|
call->app_call_state, call->app_ready_qty, call->app_mark,
|
|
call->app_last_rcv ? " last-rcvd" : "");
|
|
|
|
spin_lock(&call->lock);
|
|
|
|
ret = __rxrpc_call_read_data(call);
|
|
switch (ret) {
|
|
case 0:
|
|
spin_unlock(&call->lock);
|
|
call->app_attn_func(call);
|
|
break;
|
|
case -EAGAIN:
|
|
spin_unlock(&call->lock);
|
|
break;
|
|
case -ECONNABORTED:
|
|
spin_unlock(&call->lock);
|
|
break;
|
|
default:
|
|
__rxrpc_call_abort(call, ret);
|
|
break;
|
|
}
|
|
|
|
_state(call);
|
|
|
|
_leave("");
|
|
|
|
} /* end rxrpc_call_receive_data_packet() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* received an ACK packet
|
|
*/
|
|
static void rxrpc_call_receive_ack_packet(struct rxrpc_call *call,
|
|
struct rxrpc_message *msg)
|
|
{
|
|
struct rxrpc_ackpacket _ack, *ap;
|
|
rxrpc_serial_net_t serial;
|
|
rxrpc_seq_t seq;
|
|
int ret;
|
|
|
|
_enter("%p{%u},%p{%u}", call, ntohl(call->call_id), msg, msg->seq);
|
|
|
|
/* extract the basic ACK record */
|
|
ap = skb_header_pointer(msg->pkt, msg->offset, sizeof(_ack), &_ack);
|
|
if (ap == NULL) {
|
|
printk("Rx Received short ACK packet\n");
|
|
return;
|
|
}
|
|
msg->offset += sizeof(_ack);
|
|
|
|
serial = ap->serial;
|
|
seq = ntohl(ap->firstPacket);
|
|
|
|
_proto("Rx Received ACK %%%d { b=%hu m=%hu f=%u p=%u s=%u r=%s n=%u }",
|
|
ntohl(msg->hdr.serial),
|
|
ntohs(ap->bufferSpace),
|
|
ntohs(ap->maxSkew),
|
|
seq,
|
|
ntohl(ap->previousPacket),
|
|
ntohl(serial),
|
|
rxrpc_acks[ap->reason],
|
|
call->ackr.nAcks
|
|
);
|
|
|
|
/* check the other side isn't ACK'ing a sequence number I haven't sent
|
|
* yet */
|
|
if (ap->nAcks > 0 &&
|
|
(seq > call->snd_seq_count ||
|
|
seq + ap->nAcks - 1 > call->snd_seq_count)) {
|
|
printk("Received ACK (#%u-#%u) for unsent packet\n",
|
|
seq, seq + ap->nAcks - 1);
|
|
rxrpc_call_abort(call, -EINVAL);
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
/* deal with RTT calculation */
|
|
if (serial) {
|
|
struct rxrpc_message *rttmsg;
|
|
|
|
/* find the prompting packet */
|
|
spin_lock(&call->lock);
|
|
if (call->snd_ping && call->snd_ping->hdr.serial == serial) {
|
|
/* it was a ping packet */
|
|
rttmsg = call->snd_ping;
|
|
call->snd_ping = NULL;
|
|
spin_unlock(&call->lock);
|
|
|
|
if (rttmsg) {
|
|
rttmsg->rttdone = 1;
|
|
rxrpc_peer_calculate_rtt(call->conn->peer,
|
|
rttmsg, msg);
|
|
rxrpc_put_message(rttmsg);
|
|
}
|
|
}
|
|
else {
|
|
struct list_head *_p;
|
|
|
|
/* it ought to be a data packet - look in the pending
|
|
* ACK list */
|
|
list_for_each(_p, &call->acks_pendq) {
|
|
rttmsg = list_entry(_p, struct rxrpc_message,
|
|
link);
|
|
if (rttmsg->hdr.serial == serial) {
|
|
if (rttmsg->rttdone)
|
|
/* never do RTT twice without
|
|
* resending */
|
|
break;
|
|
|
|
rttmsg->rttdone = 1;
|
|
rxrpc_peer_calculate_rtt(
|
|
call->conn->peer, rttmsg, msg);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&call->lock);
|
|
}
|
|
}
|
|
|
|
switch (ap->reason) {
|
|
/* deal with negative/positive acknowledgement of data
|
|
* packets */
|
|
case RXRPC_ACK_REQUESTED:
|
|
case RXRPC_ACK_DELAY:
|
|
case RXRPC_ACK_IDLE:
|
|
rxrpc_call_definitively_ACK(call, seq - 1);
|
|
|
|
case RXRPC_ACK_DUPLICATE:
|
|
case RXRPC_ACK_OUT_OF_SEQUENCE:
|
|
case RXRPC_ACK_EXCEEDS_WINDOW:
|
|
call->snd_resend_cnt = 0;
|
|
ret = rxrpc_call_record_ACK(call, msg, seq, ap->nAcks);
|
|
if (ret < 0)
|
|
rxrpc_call_abort(call, ret);
|
|
break;
|
|
|
|
/* respond to ping packets immediately */
|
|
case RXRPC_ACK_PING:
|
|
rxrpc_call_generate_ACK(call, &msg->hdr, ap);
|
|
break;
|
|
|
|
/* only record RTT on ping response packets */
|
|
case RXRPC_ACK_PING_RESPONSE:
|
|
if (call->snd_ping) {
|
|
struct rxrpc_message *rttmsg;
|
|
|
|
/* only do RTT stuff if the response matches the
|
|
* retained ping */
|
|
rttmsg = NULL;
|
|
spin_lock(&call->lock);
|
|
if (call->snd_ping &&
|
|
call->snd_ping->hdr.serial == ap->serial) {
|
|
rttmsg = call->snd_ping;
|
|
call->snd_ping = NULL;
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
if (rttmsg) {
|
|
rttmsg->rttdone = 1;
|
|
rxrpc_peer_calculate_rtt(call->conn->peer,
|
|
rttmsg, msg);
|
|
rxrpc_put_message(rttmsg);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
printk("Unsupported ACK reason %u\n", ap->reason);
|
|
break;
|
|
}
|
|
|
|
_leave("");
|
|
} /* end rxrpc_call_receive_ack_packet() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* record definitive ACKs for all messages up to and including the one with the
|
|
* 'highest' seq
|
|
*/
|
|
static void rxrpc_call_definitively_ACK(struct rxrpc_call *call,
|
|
rxrpc_seq_t highest)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
int now_complete;
|
|
|
|
_enter("%p{ads=%u},%u", call, call->acks_dftv_seq, highest);
|
|
|
|
while (call->acks_dftv_seq < highest) {
|
|
call->acks_dftv_seq++;
|
|
|
|
_proto("Definitive ACK on packet #%u", call->acks_dftv_seq);
|
|
|
|
/* discard those at front of queue until message with highest
|
|
* ACK is found */
|
|
spin_lock(&call->lock);
|
|
msg = NULL;
|
|
if (!list_empty(&call->acks_pendq)) {
|
|
msg = list_entry(call->acks_pendq.next,
|
|
struct rxrpc_message, link);
|
|
list_del_init(&msg->link); /* dequeue */
|
|
if (msg->state == RXRPC_MSG_SENT)
|
|
call->acks_pend_cnt--;
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
/* insanity check */
|
|
if (!msg)
|
|
panic("%s(): acks_pendq unexpectedly empty\n",
|
|
__FUNCTION__);
|
|
|
|
if (msg->seq != call->acks_dftv_seq)
|
|
panic("%s(): Packet #%u expected at front of acks_pendq"
|
|
" (#%u found)\n",
|
|
__FUNCTION__, call->acks_dftv_seq, msg->seq);
|
|
|
|
/* discard the message */
|
|
msg->state = RXRPC_MSG_DONE;
|
|
rxrpc_put_message(msg);
|
|
}
|
|
|
|
/* if all sent packets are definitively ACK'd then prod any sleepers just in case */
|
|
now_complete = 0;
|
|
spin_lock(&call->lock);
|
|
if (call->acks_dftv_seq == call->snd_seq_count) {
|
|
if (call->app_call_state != RXRPC_CSTATE_COMPLETE) {
|
|
call->app_call_state = RXRPC_CSTATE_COMPLETE;
|
|
_state(call);
|
|
now_complete = 1;
|
|
}
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
if (now_complete) {
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
call->app_attn_func(call);
|
|
}
|
|
|
|
_leave("");
|
|
} /* end rxrpc_call_definitively_ACK() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* record the specified amount of ACKs/NAKs
|
|
*/
|
|
static int rxrpc_call_record_ACK(struct rxrpc_call *call,
|
|
struct rxrpc_message *msg,
|
|
rxrpc_seq_t seq,
|
|
size_t count)
|
|
{
|
|
struct rxrpc_message *dmsg;
|
|
struct list_head *_p;
|
|
rxrpc_seq_t highest;
|
|
unsigned ix;
|
|
size_t chunk;
|
|
char resend, now_complete;
|
|
u8 acks[16];
|
|
|
|
_enter("%p{apc=%u ads=%u},%p,%u,%Zu",
|
|
call, call->acks_pend_cnt, call->acks_dftv_seq,
|
|
msg, seq, count);
|
|
|
|
/* handle re-ACK'ing of definitively ACK'd packets (may be out-of-order
|
|
* ACKs) */
|
|
if (seq <= call->acks_dftv_seq) {
|
|
unsigned delta = call->acks_dftv_seq - seq;
|
|
|
|
if (count <= delta) {
|
|
_leave(" = 0 [all definitively ACK'd]");
|
|
return 0;
|
|
}
|
|
|
|
seq += delta;
|
|
count -= delta;
|
|
msg->offset += delta;
|
|
}
|
|
|
|
highest = seq + count - 1;
|
|
resend = 0;
|
|
while (count > 0) {
|
|
/* extract up to 16 ACK slots at a time */
|
|
chunk = min(count, sizeof(acks));
|
|
count -= chunk;
|
|
|
|
memset(acks, 2, sizeof(acks));
|
|
|
|
if (skb_copy_bits(msg->pkt, msg->offset, &acks, chunk) < 0) {
|
|
printk("Rx Received short ACK packet\n");
|
|
_leave(" = -EINVAL");
|
|
return -EINVAL;
|
|
}
|
|
msg->offset += chunk;
|
|
|
|
/* check that the ACK set is valid */
|
|
for (ix = 0; ix < chunk; ix++) {
|
|
switch (acks[ix]) {
|
|
case RXRPC_ACK_TYPE_ACK:
|
|
break;
|
|
case RXRPC_ACK_TYPE_NACK:
|
|
resend = 1;
|
|
break;
|
|
default:
|
|
printk("Rx Received unsupported ACK state"
|
|
" %u\n", acks[ix]);
|
|
_leave(" = -EINVAL");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
_proto("Rx ACK of packets #%u-#%u "
|
|
"[%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c] (pend=%u)",
|
|
seq, (unsigned) (seq + chunk - 1),
|
|
_acktype[acks[0x0]],
|
|
_acktype[acks[0x1]],
|
|
_acktype[acks[0x2]],
|
|
_acktype[acks[0x3]],
|
|
_acktype[acks[0x4]],
|
|
_acktype[acks[0x5]],
|
|
_acktype[acks[0x6]],
|
|
_acktype[acks[0x7]],
|
|
_acktype[acks[0x8]],
|
|
_acktype[acks[0x9]],
|
|
_acktype[acks[0xA]],
|
|
_acktype[acks[0xB]],
|
|
_acktype[acks[0xC]],
|
|
_acktype[acks[0xD]],
|
|
_acktype[acks[0xE]],
|
|
_acktype[acks[0xF]],
|
|
call->acks_pend_cnt
|
|
);
|
|
|
|
/* mark the packets in the ACK queue as being provisionally
|
|
* ACK'd */
|
|
ix = 0;
|
|
spin_lock(&call->lock);
|
|
|
|
/* find the first packet ACK'd/NAK'd here */
|
|
list_for_each(_p, &call->acks_pendq) {
|
|
dmsg = list_entry(_p, struct rxrpc_message, link);
|
|
if (dmsg->seq == seq)
|
|
goto found_first;
|
|
_debug("- %u: skipping #%u", ix, dmsg->seq);
|
|
}
|
|
goto bad_queue;
|
|
|
|
found_first:
|
|
do {
|
|
_debug("- %u: processing #%u (%c) apc=%u",
|
|
ix, dmsg->seq, _acktype[acks[ix]],
|
|
call->acks_pend_cnt);
|
|
|
|
if (acks[ix] == RXRPC_ACK_TYPE_ACK) {
|
|
if (dmsg->state == RXRPC_MSG_SENT)
|
|
call->acks_pend_cnt--;
|
|
dmsg->state = RXRPC_MSG_ACKED;
|
|
}
|
|
else {
|
|
if (dmsg->state == RXRPC_MSG_ACKED)
|
|
call->acks_pend_cnt++;
|
|
dmsg->state = RXRPC_MSG_SENT;
|
|
}
|
|
ix++;
|
|
seq++;
|
|
|
|
_p = dmsg->link.next;
|
|
dmsg = list_entry(_p, struct rxrpc_message, link);
|
|
} while(ix < chunk &&
|
|
_p != &call->acks_pendq &&
|
|
dmsg->seq == seq);
|
|
|
|
if (ix < chunk)
|
|
goto bad_queue;
|
|
|
|
spin_unlock(&call->lock);
|
|
}
|
|
|
|
if (resend)
|
|
rxrpc_call_resend(call, highest);
|
|
|
|
/* if all packets are provisionally ACK'd, then wake up anyone who's
|
|
* waiting for that */
|
|
now_complete = 0;
|
|
spin_lock(&call->lock);
|
|
if (call->acks_pend_cnt == 0) {
|
|
if (call->app_call_state == RXRPC_CSTATE_SRVR_RCV_FINAL_ACK) {
|
|
call->app_call_state = RXRPC_CSTATE_COMPLETE;
|
|
_state(call);
|
|
}
|
|
now_complete = 1;
|
|
}
|
|
spin_unlock(&call->lock);
|
|
|
|
if (now_complete) {
|
|
_debug("- wake up waiters");
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
call->app_attn_func(call);
|
|
}
|
|
|
|
_leave(" = 0 (apc=%u)", call->acks_pend_cnt);
|
|
return 0;
|
|
|
|
bad_queue:
|
|
panic("%s(): acks_pendq in bad state (packet #%u absent)\n",
|
|
__FUNCTION__, seq);
|
|
|
|
} /* end rxrpc_call_record_ACK() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* transfer data from the ready packet queue to the asynchronous read buffer
|
|
* - since this func is the only one going to look at packets queued on
|
|
* app_readyq, we don't need a lock to modify or access them, only to modify
|
|
* the queue pointers
|
|
* - called with call->lock held
|
|
* - the buffer must be in kernel space
|
|
* - returns:
|
|
* 0 if buffer filled
|
|
* -EAGAIN if buffer not filled and more data to come
|
|
* -EBADMSG if last packet received and insufficient data left
|
|
* -ECONNABORTED if the call has in an error state
|
|
*/
|
|
static int __rxrpc_call_read_data(struct rxrpc_call *call)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
size_t qty;
|
|
int ret;
|
|
|
|
_enter("%p{as=%d buf=%p qty=%Zu/%Zu}",
|
|
call,
|
|
call->app_async_read, call->app_read_buf,
|
|
call->app_ready_qty, call->app_mark);
|
|
|
|
/* check the state */
|
|
switch (call->app_call_state) {
|
|
case RXRPC_CSTATE_SRVR_RCV_ARGS:
|
|
case RXRPC_CSTATE_CLNT_RCV_REPLY:
|
|
if (call->app_last_rcv) {
|
|
printk("%s(%p,%p,%Zd):"
|
|
" Inconsistent call state (%s, last pkt)",
|
|
__FUNCTION__,
|
|
call, call->app_read_buf, call->app_mark,
|
|
rxrpc_call_states[call->app_call_state]);
|
|
BUG();
|
|
}
|
|
break;
|
|
|
|
case RXRPC_CSTATE_SRVR_RCV_OPID:
|
|
case RXRPC_CSTATE_SRVR_GOT_ARGS:
|
|
case RXRPC_CSTATE_CLNT_GOT_REPLY:
|
|
break;
|
|
|
|
case RXRPC_CSTATE_SRVR_SND_REPLY:
|
|
if (!call->app_last_rcv) {
|
|
printk("%s(%p,%p,%Zd):"
|
|
" Inconsistent call state (%s, not last pkt)",
|
|
__FUNCTION__,
|
|
call, call->app_read_buf, call->app_mark,
|
|
rxrpc_call_states[call->app_call_state]);
|
|
BUG();
|
|
}
|
|
_debug("Trying to read data from call in SND_REPLY state");
|
|
break;
|
|
|
|
case RXRPC_CSTATE_ERROR:
|
|
_leave(" = -ECONNABORTED");
|
|
return -ECONNABORTED;
|
|
|
|
default:
|
|
printk("reading in unexpected state [[[ %u ]]]\n",
|
|
call->app_call_state);
|
|
BUG();
|
|
}
|
|
|
|
/* handle the case of not having an async buffer */
|
|
if (!call->app_async_read) {
|
|
if (call->app_mark == RXRPC_APP_MARK_EOF) {
|
|
ret = call->app_last_rcv ? 0 : -EAGAIN;
|
|
}
|
|
else {
|
|
if (call->app_mark >= call->app_ready_qty) {
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
ret = 0;
|
|
}
|
|
else {
|
|
ret = call->app_last_rcv ? -EBADMSG : -EAGAIN;
|
|
}
|
|
}
|
|
|
|
_leave(" = %d [no buf]", ret);
|
|
return 0;
|
|
}
|
|
|
|
while (!list_empty(&call->app_readyq) && call->app_mark > 0) {
|
|
msg = list_entry(call->app_readyq.next,
|
|
struct rxrpc_message, link);
|
|
|
|
/* drag as much data as we need out of this packet */
|
|
qty = min(call->app_mark, msg->dsize);
|
|
|
|
_debug("reading %Zu from skb=%p off=%lu",
|
|
qty, msg->pkt, msg->offset);
|
|
|
|
if (call->app_read_buf)
|
|
if (skb_copy_bits(msg->pkt, msg->offset,
|
|
call->app_read_buf, qty) < 0)
|
|
panic("%s: Failed to copy data from packet:"
|
|
" (%p,%p,%Zd)",
|
|
__FUNCTION__,
|
|
call, call->app_read_buf, qty);
|
|
|
|
/* if that packet is now empty, discard it */
|
|
call->app_ready_qty -= qty;
|
|
msg->dsize -= qty;
|
|
|
|
if (msg->dsize == 0) {
|
|
list_del_init(&msg->link);
|
|
rxrpc_put_message(msg);
|
|
}
|
|
else {
|
|
msg->offset += qty;
|
|
}
|
|
|
|
call->app_mark -= qty;
|
|
if (call->app_read_buf)
|
|
call->app_read_buf += qty;
|
|
}
|
|
|
|
if (call->app_mark == 0) {
|
|
call->app_async_read = 0;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
call->app_read_buf = NULL;
|
|
|
|
/* adjust the state if used up all packets */
|
|
if (list_empty(&call->app_readyq) && call->app_last_rcv) {
|
|
switch (call->app_call_state) {
|
|
case RXRPC_CSTATE_SRVR_RCV_OPID:
|
|
call->app_call_state = RXRPC_CSTATE_SRVR_SND_REPLY;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
_state(call);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
break;
|
|
case RXRPC_CSTATE_SRVR_GOT_ARGS:
|
|
call->app_call_state = RXRPC_CSTATE_SRVR_SND_REPLY;
|
|
_state(call);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
break;
|
|
default:
|
|
call->app_call_state = RXRPC_CSTATE_COMPLETE;
|
|
_state(call);
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
break;
|
|
}
|
|
}
|
|
|
|
_leave(" = 0");
|
|
return 0;
|
|
}
|
|
|
|
if (call->app_last_rcv) {
|
|
_debug("Insufficient data (%Zu/%Zu)",
|
|
call->app_ready_qty, call->app_mark);
|
|
call->app_async_read = 0;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
call->app_read_buf = NULL;
|
|
|
|
_leave(" = -EBADMSG");
|
|
return -EBADMSG;
|
|
}
|
|
|
|
_leave(" = -EAGAIN");
|
|
return -EAGAIN;
|
|
} /* end __rxrpc_call_read_data() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* attempt to read the specified amount of data from the call's ready queue
|
|
* into the buffer provided
|
|
* - since this func is the only one going to look at packets queued on
|
|
* app_readyq, we don't need a lock to modify or access them, only to modify
|
|
* the queue pointers
|
|
* - if the buffer pointer is NULL, then data is merely drained, not copied
|
|
* - if flags&RXRPC_CALL_READ_BLOCK, then the function will wait until there is
|
|
* enough data or an error will be generated
|
|
* - note that the caller must have added the calling task to the call's wait
|
|
* queue beforehand
|
|
* - if flags&RXRPC_CALL_READ_ALL, then an error will be generated if this
|
|
* function doesn't read all available data
|
|
*/
|
|
int rxrpc_call_read_data(struct rxrpc_call *call,
|
|
void *buffer, size_t size, int flags)
|
|
{
|
|
int ret;
|
|
|
|
_enter("%p{arq=%Zu},%p,%Zd,%x",
|
|
call, call->app_ready_qty, buffer, size, flags);
|
|
|
|
spin_lock(&call->lock);
|
|
|
|
if (unlikely(!!call->app_read_buf)) {
|
|
spin_unlock(&call->lock);
|
|
_leave(" = -EBUSY");
|
|
return -EBUSY;
|
|
}
|
|
|
|
call->app_mark = size;
|
|
call->app_read_buf = buffer;
|
|
call->app_async_read = 1;
|
|
call->app_read_count++;
|
|
|
|
/* read as much data as possible */
|
|
ret = __rxrpc_call_read_data(call);
|
|
switch (ret) {
|
|
case 0:
|
|
if (flags & RXRPC_CALL_READ_ALL &&
|
|
(!call->app_last_rcv || call->app_ready_qty > 0)) {
|
|
_leave(" = -EBADMSG");
|
|
__rxrpc_call_abort(call, -EBADMSG);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
spin_unlock(&call->lock);
|
|
call->app_attn_func(call);
|
|
_leave(" = 0");
|
|
return ret;
|
|
|
|
case -ECONNABORTED:
|
|
spin_unlock(&call->lock);
|
|
_leave(" = %d [aborted]", ret);
|
|
return ret;
|
|
|
|
default:
|
|
__rxrpc_call_abort(call, ret);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
case -EAGAIN:
|
|
spin_unlock(&call->lock);
|
|
|
|
if (!(flags & RXRPC_CALL_READ_BLOCK)) {
|
|
_leave(" = -EAGAIN");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* wait for the data to arrive */
|
|
_debug("blocking for data arrival");
|
|
|
|
for (;;) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!call->app_async_read || signal_pending(current))
|
|
break;
|
|
schedule();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
if (signal_pending(current)) {
|
|
_leave(" = -EINTR");
|
|
return -EINTR;
|
|
}
|
|
|
|
if (call->app_call_state == RXRPC_CSTATE_ERROR) {
|
|
_leave(" = -ECONNABORTED");
|
|
return -ECONNABORTED;
|
|
}
|
|
|
|
_leave(" = 0");
|
|
return 0;
|
|
}
|
|
|
|
} /* end rxrpc_call_read_data() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* write data to a call
|
|
* - the data may not be sent immediately if it doesn't fill a buffer
|
|
* - if we can't queue all the data for buffering now, siov[] will have been
|
|
* adjusted to take account of what has been sent
|
|
*/
|
|
int rxrpc_call_write_data(struct rxrpc_call *call,
|
|
size_t sioc,
|
|
struct kvec *siov,
|
|
u8 rxhdr_flags,
|
|
int alloc_flags,
|
|
int dup_data,
|
|
size_t *size_sent)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
struct kvec *sptr;
|
|
size_t space, size, chunk, tmp;
|
|
char *buf;
|
|
int ret;
|
|
|
|
_enter("%p,%Zu,%p,%02x,%x,%d,%p",
|
|
call, sioc, siov, rxhdr_flags, alloc_flags, dup_data,
|
|
size_sent);
|
|
|
|
*size_sent = 0;
|
|
size = 0;
|
|
ret = -EINVAL;
|
|
|
|
/* can't send more if we've sent last packet from this end */
|
|
switch (call->app_call_state) {
|
|
case RXRPC_CSTATE_SRVR_SND_REPLY:
|
|
case RXRPC_CSTATE_CLNT_SND_ARGS:
|
|
break;
|
|
case RXRPC_CSTATE_ERROR:
|
|
ret = call->app_errno;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
/* calculate how much data we've been given */
|
|
sptr = siov;
|
|
for (; sioc > 0; sptr++, sioc--) {
|
|
if (!sptr->iov_len)
|
|
continue;
|
|
|
|
if (!sptr->iov_base)
|
|
goto out;
|
|
|
|
size += sptr->iov_len;
|
|
}
|
|
|
|
_debug("- size=%Zu mtu=%Zu", size, call->conn->mtu_size);
|
|
|
|
do {
|
|
/* make sure there's a message under construction */
|
|
if (!call->snd_nextmsg) {
|
|
/* no - allocate a message with no data yet attached */
|
|
ret = rxrpc_conn_newmsg(call->conn, call,
|
|
RXRPC_PACKET_TYPE_DATA,
|
|
0, NULL, alloc_flags,
|
|
&call->snd_nextmsg);
|
|
if (ret < 0)
|
|
goto out;
|
|
_debug("- allocated new message [ds=%Zu]",
|
|
call->snd_nextmsg->dsize);
|
|
}
|
|
|
|
msg = call->snd_nextmsg;
|
|
msg->hdr.flags |= rxhdr_flags;
|
|
|
|
/* deal with zero-length terminal packet */
|
|
if (size == 0) {
|
|
if (rxhdr_flags & RXRPC_LAST_PACKET) {
|
|
ret = rxrpc_call_flush(call);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* work out how much space current packet has available */
|
|
space = call->conn->mtu_size - msg->dsize;
|
|
chunk = min(space, size);
|
|
|
|
_debug("- [before] space=%Zu chunk=%Zu", space, chunk);
|
|
|
|
while (!siov->iov_len)
|
|
siov++;
|
|
|
|
/* if we are going to have to duplicate the data then coalesce
|
|
* it too */
|
|
if (dup_data) {
|
|
/* don't allocate more that 1 page at a time */
|
|
if (chunk > PAGE_SIZE)
|
|
chunk = PAGE_SIZE;
|
|
|
|
/* allocate a data buffer and attach to the message */
|
|
buf = kmalloc(chunk, alloc_flags);
|
|
if (unlikely(!buf)) {
|
|
if (msg->dsize ==
|
|
sizeof(struct rxrpc_header)) {
|
|
/* discard an empty msg and wind back
|
|
* the seq counter */
|
|
rxrpc_put_message(msg);
|
|
call->snd_nextmsg = NULL;
|
|
call->snd_seq_count--;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
tmp = msg->dcount++;
|
|
set_bit(tmp, &msg->dfree);
|
|
msg->data[tmp].iov_base = buf;
|
|
msg->data[tmp].iov_len = chunk;
|
|
msg->dsize += chunk;
|
|
*size_sent += chunk;
|
|
size -= chunk;
|
|
|
|
/* load the buffer with data */
|
|
while (chunk > 0) {
|
|
tmp = min(chunk, siov->iov_len);
|
|
memcpy(buf, siov->iov_base, tmp);
|
|
buf += tmp;
|
|
siov->iov_base += tmp;
|
|
siov->iov_len -= tmp;
|
|
if (!siov->iov_len)
|
|
siov++;
|
|
chunk -= tmp;
|
|
}
|
|
}
|
|
else {
|
|
/* we want to attach the supplied buffers directly */
|
|
while (chunk > 0 &&
|
|
msg->dcount < RXRPC_MSG_MAX_IOCS) {
|
|
tmp = msg->dcount++;
|
|
msg->data[tmp].iov_base = siov->iov_base;
|
|
msg->data[tmp].iov_len = siov->iov_len;
|
|
msg->dsize += siov->iov_len;
|
|
*size_sent += siov->iov_len;
|
|
size -= siov->iov_len;
|
|
chunk -= siov->iov_len;
|
|
siov++;
|
|
}
|
|
}
|
|
|
|
_debug("- [loaded] chunk=%Zu size=%Zu", chunk, size);
|
|
|
|
/* dispatch the message when full, final or requesting ACK */
|
|
if (msg->dsize >= call->conn->mtu_size || rxhdr_flags) {
|
|
ret = rxrpc_call_flush(call);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
} while(size > 0);
|
|
|
|
ret = 0;
|
|
out:
|
|
_leave(" = %d (%Zd queued, %Zd rem)", ret, *size_sent, size);
|
|
return ret;
|
|
|
|
} /* end rxrpc_call_write_data() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* flush outstanding packets to the network
|
|
*/
|
|
static int rxrpc_call_flush(struct rxrpc_call *call)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
int ret = 0;
|
|
|
|
_enter("%p", call);
|
|
|
|
rxrpc_get_call(call);
|
|
|
|
/* if there's a packet under construction, then dispatch it now */
|
|
if (call->snd_nextmsg) {
|
|
msg = call->snd_nextmsg;
|
|
call->snd_nextmsg = NULL;
|
|
|
|
if (msg->hdr.flags & RXRPC_LAST_PACKET) {
|
|
msg->hdr.flags &= ~RXRPC_MORE_PACKETS;
|
|
if (call->app_call_state != RXRPC_CSTATE_CLNT_SND_ARGS)
|
|
msg->hdr.flags |= RXRPC_REQUEST_ACK;
|
|
}
|
|
else {
|
|
msg->hdr.flags |= RXRPC_MORE_PACKETS;
|
|
}
|
|
|
|
_proto("Sending DATA message { ds=%Zu dc=%u df=%02lu }",
|
|
msg->dsize, msg->dcount, msg->dfree);
|
|
|
|
/* queue and adjust call state */
|
|
spin_lock(&call->lock);
|
|
list_add_tail(&msg->link, &call->acks_pendq);
|
|
|
|
/* decide what to do depending on current state and if this is
|
|
* the last packet */
|
|
ret = -EINVAL;
|
|
switch (call->app_call_state) {
|
|
case RXRPC_CSTATE_SRVR_SND_REPLY:
|
|
if (msg->hdr.flags & RXRPC_LAST_PACKET) {
|
|
call->app_call_state =
|
|
RXRPC_CSTATE_SRVR_RCV_FINAL_ACK;
|
|
_state(call);
|
|
}
|
|
break;
|
|
|
|
case RXRPC_CSTATE_CLNT_SND_ARGS:
|
|
if (msg->hdr.flags & RXRPC_LAST_PACKET) {
|
|
call->app_call_state =
|
|
RXRPC_CSTATE_CLNT_RCV_REPLY;
|
|
_state(call);
|
|
}
|
|
break;
|
|
|
|
case RXRPC_CSTATE_ERROR:
|
|
ret = call->app_errno;
|
|
default:
|
|
spin_unlock(&call->lock);
|
|
goto out;
|
|
}
|
|
|
|
call->acks_pend_cnt++;
|
|
|
|
mod_timer(&call->acks_timeout,
|
|
__rxrpc_rtt_based_timeout(call,
|
|
rxrpc_call_acks_timeout));
|
|
|
|
spin_unlock(&call->lock);
|
|
|
|
ret = rxrpc_conn_sendmsg(call->conn, msg);
|
|
if (ret == 0)
|
|
call->pkt_snd_count++;
|
|
}
|
|
|
|
out:
|
|
rxrpc_put_call(call);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
} /* end rxrpc_call_flush() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* resend NAK'd or unacknowledged packets up to the highest one specified
|
|
*/
|
|
static void rxrpc_call_resend(struct rxrpc_call *call, rxrpc_seq_t highest)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
struct list_head *_p;
|
|
rxrpc_seq_t seq = 0;
|
|
|
|
_enter("%p,%u", call, highest);
|
|
|
|
_proto("Rx Resend required");
|
|
|
|
/* handle too many resends */
|
|
if (call->snd_resend_cnt >= rxrpc_call_max_resend) {
|
|
_debug("Aborting due to too many resends (rcv=%d)",
|
|
call->pkt_rcv_count);
|
|
rxrpc_call_abort(call,
|
|
call->pkt_rcv_count > 0 ? -EIO : -ETIMEDOUT);
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
spin_lock(&call->lock);
|
|
call->snd_resend_cnt++;
|
|
for (;;) {
|
|
/* determine which the next packet we might need to ACK is */
|
|
if (seq <= call->acks_dftv_seq)
|
|
seq = call->acks_dftv_seq;
|
|
seq++;
|
|
|
|
if (seq > highest)
|
|
break;
|
|
|
|
/* look for the packet in the pending-ACK queue */
|
|
list_for_each(_p, &call->acks_pendq) {
|
|
msg = list_entry(_p, struct rxrpc_message, link);
|
|
if (msg->seq == seq)
|
|
goto found_msg;
|
|
}
|
|
|
|
panic("%s(%p,%d):"
|
|
" Inconsistent pending-ACK queue (ds=%u sc=%u sq=%u)\n",
|
|
__FUNCTION__, call, highest,
|
|
call->acks_dftv_seq, call->snd_seq_count, seq);
|
|
|
|
found_msg:
|
|
if (msg->state != RXRPC_MSG_SENT)
|
|
continue; /* only un-ACK'd packets */
|
|
|
|
rxrpc_get_message(msg);
|
|
spin_unlock(&call->lock);
|
|
|
|
/* send each message again (and ignore any errors we might
|
|
* incur) */
|
|
_proto("Resending DATA message { ds=%Zu dc=%u df=%02lu }",
|
|
msg->dsize, msg->dcount, msg->dfree);
|
|
|
|
if (rxrpc_conn_sendmsg(call->conn, msg) == 0)
|
|
call->pkt_snd_count++;
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
spin_lock(&call->lock);
|
|
}
|
|
|
|
/* reset the timeout */
|
|
mod_timer(&call->acks_timeout,
|
|
__rxrpc_rtt_based_timeout(call, rxrpc_call_acks_timeout));
|
|
|
|
spin_unlock(&call->lock);
|
|
|
|
_leave("");
|
|
} /* end rxrpc_call_resend() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* handle an ICMP error being applied to a call
|
|
*/
|
|
void rxrpc_call_handle_error(struct rxrpc_call *call, int local, int errno)
|
|
{
|
|
_enter("%p{%u},%d", call, ntohl(call->call_id), errno);
|
|
|
|
/* if this call is already aborted, then just wake up any waiters */
|
|
if (call->app_call_state == RXRPC_CSTATE_ERROR) {
|
|
call->app_error_func(call);
|
|
}
|
|
else {
|
|
/* tell the app layer what happened */
|
|
spin_lock(&call->lock);
|
|
call->app_call_state = RXRPC_CSTATE_ERROR;
|
|
_state(call);
|
|
if (local)
|
|
call->app_err_state = RXRPC_ESTATE_LOCAL_ERROR;
|
|
else
|
|
call->app_err_state = RXRPC_ESTATE_REMOTE_ERROR;
|
|
call->app_errno = errno;
|
|
call->app_mark = RXRPC_APP_MARK_EOF;
|
|
call->app_read_buf = NULL;
|
|
call->app_async_read = 0;
|
|
|
|
/* map the error */
|
|
call->app_aemap_func(call);
|
|
|
|
del_timer_sync(&call->acks_timeout);
|
|
del_timer_sync(&call->rcv_timeout);
|
|
del_timer_sync(&call->ackr_dfr_timo);
|
|
|
|
spin_unlock(&call->lock);
|
|
|
|
call->app_error_func(call);
|
|
}
|
|
|
|
_leave("");
|
|
} /* end rxrpc_call_handle_error() */
|