Linux-2.6.12-rc2
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!
diff --git a/net/rxrpc/call.c b/net/rxrpc/call.c
new file mode 100644
index 0000000..5cfd4ca
--- /dev/null
+++ b/net/rxrpc/call.c
@@ -0,0 +1,2278 @@
+/* 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,
+ 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() */