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android_kernel_motorola_sm6225/net/rxrpc/call.c
Al Viro dd0fc66fb3 [PATCH] gfp flags annotations - part 1 
- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-08 15:00:57 -07:00

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/* call.c: Rx call routines
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <rxrpc/rxrpc.h>
#include <rxrpc/transport.h>
#include <rxrpc/peer.h>
#include <rxrpc/connection.h>
#include <rxrpc/call.h>
#include <rxrpc/message.h>
#include "internal.h"
__RXACCT_DECL(atomic_t rxrpc_call_count);
__RXACCT_DECL(atomic_t rxrpc_message_count);
LIST_HEAD(rxrpc_calls);
DECLARE_RWSEM(rxrpc_calls_sem);
unsigned rxrpc_call_rcv_timeout = HZ/3;
static unsigned rxrpc_call_acks_timeout = HZ/3;
static unsigned rxrpc_call_dfr_ack_timeout = HZ/20;
static unsigned short rxrpc_call_max_resend = HZ/10;
const char *rxrpc_call_states[] = {
"COMPLETE",
"ERROR",
"SRVR_RCV_OPID",
"SRVR_RCV_ARGS",
"SRVR_GOT_ARGS",
"SRVR_SND_REPLY",
"SRVR_RCV_FINAL_ACK",
"CLNT_SND_ARGS",
"CLNT_RCV_REPLY",
"CLNT_GOT_REPLY"
};
const char *rxrpc_call_error_states[] = {
"NO_ERROR",
"LOCAL_ABORT",
"PEER_ABORT",
"LOCAL_ERROR",
"REMOTE_ERROR"
};
const char *rxrpc_pkts[] = {
"?00",
"data", "ack", "busy", "abort", "ackall", "chall", "resp", "debug",
"?09", "?10", "?11", "?12", "?13", "?14", "?15"
};
static const char *rxrpc_acks[] = {
"---", "REQ", "DUP", "SEQ", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
"-?-"
};
static const char _acktype[] = "NA-";
static void rxrpc_call_receive_packet(struct rxrpc_call *call);
static void rxrpc_call_receive_data_packet(struct rxrpc_call *call,
struct rxrpc_message *msg);
static void rxrpc_call_receive_ack_packet(struct rxrpc_call *call,
struct rxrpc_message *msg);
static void rxrpc_call_definitively_ACK(struct rxrpc_call *call,
rxrpc_seq_t higest);
static void rxrpc_call_resend(struct rxrpc_call *call, rxrpc_seq_t highest);
static int __rxrpc_call_read_data(struct rxrpc_call *call);
static int rxrpc_call_record_ACK(struct rxrpc_call *call,
struct rxrpc_message *msg,
rxrpc_seq_t seq,
size_t count);
static int rxrpc_call_flush(struct rxrpc_call *call);
#define _state(call) \
_debug("[[[ state %s ]]]", rxrpc_call_states[call->app_call_state]);
static void rxrpc_call_default_attn_func(struct rxrpc_call *call)
{
wake_up(&call->waitq);
}
static void rxrpc_call_default_error_func(struct rxrpc_call *call)
{
wake_up(&call->waitq);
}
static void rxrpc_call_default_aemap_func(struct rxrpc_call *call)
{
switch (call->app_err_state) {
case RXRPC_ESTATE_LOCAL_ABORT:
call->app_abort_code = -call->app_errno;
case RXRPC_ESTATE_PEER_ABORT:
call->app_errno = -ECONNABORTED;
default:
break;
}
}
static void __rxrpc_call_acks_timeout(unsigned long _call)
{
struct rxrpc_call *call = (struct rxrpc_call *) _call;
_debug("ACKS TIMEOUT %05lu", jiffies - call->cjif);
call->flags |= RXRPC_CALL_ACKS_TIMO;
rxrpc_krxiod_queue_call(call);
}
static void __rxrpc_call_rcv_timeout(unsigned long _call)
{
struct rxrpc_call *call = (struct rxrpc_call *) _call;
_debug("RCV TIMEOUT %05lu", jiffies - call->cjif);
call->flags |= RXRPC_CALL_RCV_TIMO;
rxrpc_krxiod_queue_call(call);
}
static void __rxrpc_call_ackr_timeout(unsigned long _call)
{
struct rxrpc_call *call = (struct rxrpc_call *) _call;
_debug("ACKR TIMEOUT %05lu",jiffies - call->cjif);
call->flags |= RXRPC_CALL_ACKR_TIMO;
rxrpc_krxiod_queue_call(call);
}
/*****************************************************************************/
/*
* calculate a timeout based on an RTT value
*/
static inline unsigned long __rxrpc_rtt_based_timeout(struct rxrpc_call *call,
unsigned long val)
{
unsigned long expiry = call->conn->peer->rtt / (1000000 / HZ);
expiry += 10;
if (expiry < HZ / 25)
expiry = HZ / 25;
if (expiry > HZ)
expiry = HZ;
_leave(" = %lu jiffies", expiry);
return jiffies + expiry;
} /* end __rxrpc_rtt_based_timeout() */
/*****************************************************************************/
/*
* create a new call record
*/
static inline int __rxrpc_create_call(struct rxrpc_connection *conn,
struct rxrpc_call **_call)
{
struct rxrpc_call *call;
_enter("%p", conn);
/* allocate and initialise a call record */
call = (struct rxrpc_call *) get_zeroed_page(GFP_KERNEL);
if (!call) {
_leave(" ENOMEM");
return -ENOMEM;
}
atomic_set(&call->usage, 1);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->lock);
INIT_LIST_HEAD(&call->link);
INIT_LIST_HEAD(&call->acks_pendq);
INIT_LIST_HEAD(&call->rcv_receiveq);
INIT_LIST_HEAD(&call->rcv_krxiodq_lk);
INIT_LIST_HEAD(&call->app_readyq);
INIT_LIST_HEAD(&call->app_unreadyq);
INIT_LIST_HEAD(&call->app_link);
INIT_LIST_HEAD(&call->app_attn_link);
init_timer(&call->acks_timeout);
call->acks_timeout.data = (unsigned long) call;
call->acks_timeout.function = __rxrpc_call_acks_timeout;
init_timer(&call->rcv_timeout);
call->rcv_timeout.data = (unsigned long) call;
call->rcv_timeout.function = __rxrpc_call_rcv_timeout;
init_timer(&call->ackr_dfr_timo);
call->ackr_dfr_timo.data = (unsigned long) call;
call->ackr_dfr_timo.function = __rxrpc_call_ackr_timeout;
call->conn = conn;
call->ackr_win_bot = 1;
call->ackr_win_top = call->ackr_win_bot + RXRPC_CALL_ACK_WINDOW_SIZE - 1;
call->ackr_prev_seq = 0;
call->app_mark = RXRPC_APP_MARK_EOF;
call->app_attn_func = rxrpc_call_default_attn_func;
call->app_error_func = rxrpc_call_default_error_func;
call->app_aemap_func = rxrpc_call_default_aemap_func;
call->app_scr_alloc = call->app_scratch;
call->cjif = jiffies;
_leave(" = 0 (%p)", call);
*_call = call;
return 0;
} /* end __rxrpc_create_call() */
/*****************************************************************************/
/*
* create a new call record for outgoing calls
*/
int rxrpc_create_call(struct rxrpc_connection *conn,
rxrpc_call_attn_func_t attn,
rxrpc_call_error_func_t error,
rxrpc_call_aemap_func_t aemap,
struct rxrpc_call **_call)
{
DECLARE_WAITQUEUE(myself, current);
struct rxrpc_call *call;
int ret, cix, loop;
_enter("%p", conn);
/* allocate and initialise a call record */
ret = __rxrpc_create_call(conn, &call);
if (ret < 0) {
_leave(" = %d", ret);
return ret;
}
call->app_call_state = RXRPC_CSTATE_CLNT_SND_ARGS;
if (attn)
call->app_attn_func = attn;
if (error)
call->app_error_func = error;
if (aemap)
call->app_aemap_func = aemap;
_state(call);
spin_lock(&conn->lock);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&conn->chanwait, &myself);
try_again:
/* try to find an unused channel */
for (cix = 0; cix < 4; cix++)
if (!conn->channels[cix])
goto obtained_chan;
/* no free channels - wait for one to become available */
ret = -EINTR;
if (signal_pending(current))
goto error_unwait;
spin_unlock(&conn->lock);
schedule();
set_current_state(TASK_INTERRUPTIBLE);
spin_lock(&conn->lock);
goto try_again;
/* got a channel - now attach to the connection */
obtained_chan:
remove_wait_queue(&conn->chanwait, &myself);
set_current_state(TASK_RUNNING);
/* concoct a unique call number */
next_callid:
call->call_id = htonl(++conn->call_counter);
for (loop = 0; loop < 4; loop++)
if (conn->channels[loop] &&
conn->channels[loop]->call_id == call->call_id)
goto next_callid;
rxrpc_get_connection(conn);
conn->channels[cix] = call; /* assign _after_ done callid check loop */
do_gettimeofday(&conn->atime);
call->chan_ix = htonl(cix);
spin_unlock(&conn->lock);
down_write(&rxrpc_calls_sem);
list_add_tail(&call->call_link, &rxrpc_calls);
up_write(&rxrpc_calls_sem);
__RXACCT(atomic_inc(&rxrpc_call_count));
*_call = call;
_leave(" = 0 (call=%p cix=%u)", call, cix);
return 0;
error_unwait:
remove_wait_queue(&conn->chanwait, &myself);
set_current_state(TASK_RUNNING);
spin_unlock(&conn->lock);
free_page((unsigned long) call);
_leave(" = %d", ret);
return ret;
} /* end rxrpc_create_call() */
/*****************************************************************************/
/*
* create a new call record for incoming calls
*/
int rxrpc_incoming_call(struct rxrpc_connection *conn,
struct rxrpc_message *msg,
struct rxrpc_call **_call)
{
struct rxrpc_call *call;
unsigned cix;
int ret;
cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
_enter("%p,%u,%u", conn, ntohl(msg->hdr.callNumber), cix);
/* allocate and initialise a call record */
ret = __rxrpc_create_call(conn, &call);
if (ret < 0) {
_leave(" = %d", ret);
return ret;
}
call->pkt_rcv_count = 1;
call->app_call_state = RXRPC_CSTATE_SRVR_RCV_OPID;
call->app_mark = sizeof(uint32_t);
_state(call);
/* attach to the connection */
ret = -EBUSY;
call->chan_ix = htonl(cix);
call->call_id = msg->hdr.callNumber;
spin_lock(&conn->lock);
if (!conn->channels[cix] ||
conn->channels[cix]->app_call_state == RXRPC_CSTATE_COMPLETE ||
conn->channels[cix]->app_call_state == RXRPC_CSTATE_ERROR
) {
conn->channels[cix] = call;
rxrpc_get_connection(conn);
ret = 0;
}
spin_unlock(&conn->lock);
if (ret < 0) {
free_page((unsigned long) call);
call = NULL;
}
if (ret == 0) {
down_write(&rxrpc_calls_sem);
list_add_tail(&call->call_link, &rxrpc_calls);
up_write(&rxrpc_calls_sem);
__RXACCT(atomic_inc(&rxrpc_call_count));
*_call = call;
}
_leave(" = %d [%p]", ret, call);
return ret;
} /* end rxrpc_incoming_call() */
/*****************************************************************************/
/*
* free a call record
*/
void rxrpc_put_call(struct rxrpc_call *call)
{
struct rxrpc_connection *conn = call->conn;
struct rxrpc_message *msg;
_enter("%p{u=%d}",call,atomic_read(&call->usage));
/* sanity check */
if (atomic_read(&call->usage) <= 0)
BUG();
/* to prevent a race, the decrement and the de-list must be effectively
* atomic */
spin_lock(&conn->lock);
if (likely(!atomic_dec_and_test(&call->usage))) {
spin_unlock(&conn->lock);
_leave("");
return;
}
if (conn->channels[ntohl(call->chan_ix)] == call)
conn->channels[ntohl(call->chan_ix)] = NULL;
spin_unlock(&conn->lock);
wake_up(&conn->chanwait);
rxrpc_put_connection(conn);
/* clear the timers and dequeue from krxiod */
del_timer_sync(&call->acks_timeout);
del_timer_sync(&call->rcv_timeout);
del_timer_sync(&call->ackr_dfr_timo);
rxrpc_krxiod_dequeue_call(call);
/* clean up the contents of the struct */
if (call->snd_nextmsg)
rxrpc_put_message(call->snd_nextmsg);
if (call->snd_ping)
rxrpc_put_message(call->snd_ping);
while (!list_empty(&call->acks_pendq)) {
msg = list_entry(call->acks_pendq.next,
struct rxrpc_message, link);
list_del(&msg->link);
rxrpc_put_message(msg);
}
while (!list_empty(&call->rcv_receiveq)) {
msg = list_entry(call->rcv_receiveq.next,
struct rxrpc_message, link);
list_del(&msg->link);
rxrpc_put_message(msg);
}
while (!list_empty(&call->app_readyq)) {
msg = list_entry(call->app_readyq.next,
struct rxrpc_message, link);
list_del(&msg->link);
rxrpc_put_message(msg);
}
while (!list_empty(&call->app_unreadyq)) {
msg = list_entry(call->app_unreadyq.next,
struct rxrpc_message, link);
list_del(&msg->link);
rxrpc_put_message(msg);
}
module_put(call->owner);
down_write(&rxrpc_calls_sem);
list_del(&call->call_link);
up_write(&rxrpc_calls_sem);
__RXACCT(atomic_dec(&rxrpc_call_count));
free_page((unsigned long) call);
_leave(" [destroyed]");
} /* end rxrpc_put_call() */
/*****************************************************************************/
/*
* actually generate a normal ACK
*/
static inline int __rxrpc_call_gen_normal_ACK(struct rxrpc_call *call,
rxrpc_seq_t seq)
{
struct rxrpc_message *msg;
struct kvec diov[3];
__be32 aux[4];
int delta, ret;
/* ACKs default to DELAY */
if (!call->ackr.reason)
call->ackr.reason = RXRPC_ACK_DELAY;
_proto("Rx %05lu Sending ACK { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
jiffies - call->cjif,
ntohs(call->ackr.maxSkew),
ntohl(call->ackr.firstPacket),
ntohl(call->ackr.previousPacket),
ntohl(call->ackr.serial),
rxrpc_acks[call->ackr.reason],
call->ackr.nAcks);
aux[0] = htonl(call->conn->peer->if_mtu); /* interface MTU */
aux[1] = htonl(1444); /* max MTU */
aux[2] = htonl(16); /* rwind */
aux[3] = htonl(4); /* max packets */
diov[0].iov_len = sizeof(struct rxrpc_ackpacket);
diov[0].iov_base = &call->ackr;
diov[1].iov_len = call->ackr_pend_cnt + 3;
diov[1].iov_base = call->ackr_array;
diov[2].iov_len = sizeof(aux);
diov[2].iov_base = &aux;
/* 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,
gfp_t 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() */
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