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-rw-r--r--net/rxrpc/ar-ack.c61
1 files changed, 51 insertions, 10 deletions
diff --git a/net/rxrpc/ar-ack.c b/net/rxrpc/ar-ack.c
index cd97a0c..c6be17a 100644
--- a/net/rxrpc/ar-ack.c
+++ b/net/rxrpc/ar-ack.c
@@ -19,7 +19,49 @@
#include <net/af_rxrpc.h>
#include "ar-internal.h"
-static unsigned int rxrpc_ack_defer = 1;
+/*
+ * How long to wait before scheduling ACK generation after seeing a
+ * packet with RXRPC_REQUEST_ACK set (in jiffies).
+ */
+unsigned rxrpc_requested_ack_delay = 1;
+
+/*
+ * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
+ *
+ * We use this when we've received new data packets. If those packets aren't
+ * all consumed within this time we will send a DELAY ACK if an ACK was not
+ * requested to let the sender know it doesn't need to resend.
+ */
+unsigned rxrpc_soft_ack_delay = 1 * HZ;
+
+/*
+ * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
+ *
+ * We use this when we've consumed some previously soft-ACK'd packets when
+ * further packets aren't immediately received to decide when to send an IDLE
+ * ACK let the other end know that it can free up its Tx buffer space.
+ */
+unsigned rxrpc_idle_ack_delay = 0.5 * HZ;
+
+/*
+ * Receive window size in packets. This indicates the maximum number of
+ * unconsumed received packets we're willing to retain in memory. Once this
+ * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
+ * packets.
+ */
+unsigned rxrpc_rx_window_size = 32;
+
+/*
+ * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
+ * made by gluing normal packets together that we're willing to handle.
+ */
+unsigned rxrpc_rx_mtu = 5692;
+
+/*
+ * The maximum number of fragments in a received jumbo packet that we tell the
+ * sender that we're willing to handle.
+ */
+unsigned rxrpc_rx_jumbo_max = 4;
static const char *rxrpc_acks(u8 reason)
{
@@ -82,24 +124,23 @@ void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
switch (ack_reason) {
case RXRPC_ACK_DELAY:
_debug("run delay timer");
- call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ;
- add_timer(&call->ack_timer);
- return;
+ expiry = rxrpc_soft_ack_delay;
+ goto run_timer;
case RXRPC_ACK_IDLE:
if (!immediate) {
_debug("run defer timer");
- expiry = 1;
+ expiry = rxrpc_idle_ack_delay;
goto run_timer;
}
goto cancel_timer;
case RXRPC_ACK_REQUESTED:
- if (!rxrpc_ack_defer)
+ expiry = rxrpc_requested_ack_delay;
+ if (!expiry)
goto cancel_timer;
if (!immediate || serial == cpu_to_be32(1)) {
_debug("run defer timer");
- expiry = rxrpc_ack_defer;
goto run_timer;
}
@@ -1174,11 +1215,11 @@ send_ACK:
mtu = call->conn->trans->peer->if_mtu;
mtu -= call->conn->trans->peer->hdrsize;
ackinfo.maxMTU = htonl(mtu);
- ackinfo.rwind = htonl(32);
+ ackinfo.rwind = htonl(rxrpc_rx_window_size);
/* permit the peer to send us jumbo packets if it wants to */
- ackinfo.rxMTU = htonl(5692);
- ackinfo.jumbo_max = htonl(4);
+ ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
+ ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max);
hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
_proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
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