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rxrpc: Correctly initialise, limit and transmit call->rx_winsize 

call->rx_winsize should be initialised to the sysctl setting and the sysctl
setting should be limited to the maximum we want to permit.  Further, we
need to place this in the ACK info instead of the sysctl setting.

Furthermore, discard the idea of accepting the subpackets of a jumbo packet
that lie beyond the receive window when the first packet of the jumbo is
within the window.  Just discard the excess subpackets instead.  This
allows the receive window to be opened up right to the buffer size less one
for the dead slot.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-13 22:36:22 +01:00
parent 3432a757b1
commit 75e4212639
6 changed files with 26 additions and 13 deletions
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3
net/rxrpc/ar-internal.h
View File

@ -498,6 +498,7 @@ struct rxrpc_call {
*/
#define RXRPC_RXTX_BUFF_SIZE 64
#define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
#define RXRPC_INIT_RX_WINDOW_SIZE 32
struct sk_buff **rxtx_buffer;
u8 *rxtx_annotations;
#define RXRPC_TX_ANNO_ACK 0
@ -518,7 +519,7 @@ struct rxrpc_call {
rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
u8 rx_winsize; /* Size of Rx window */
u8 tx_winsize; /* Maximum size of Tx window */
u8 nr_jumbo_dup; /* Number of jumbo duplicates */
u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
/* receive-phase ACK management */
u8 ackr_reason; /* reason to ACK */

2
net/rxrpc/call_object.c
View File

@ -152,7 +152,7 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
memset(&call->sock_node, 0xed, sizeof(call->sock_node));
/* Leave space in the ring to handle a maxed-out jumbo packet */
call->rx_winsize = RXRPC_RXTX_BUFF_SIZE - 1 - 46;
call->rx_winsize = rxrpc_rx_window_size;
call->tx_winsize = 16;
call->rx_expect_next = 1;
return call;

23
net/rxrpc/input.c
View File

@ -164,7 +164,7 @@ protocol_error:
* (that information is encoded in the ACK packet).
*/
static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
u8 annotation, bool *_jumbo_dup)
u8 annotation, bool *_jumbo_bad)
{
/* Discard normal packets that are duplicates. */
if (annotation == 0)
@ -174,9 +174,9 @@ static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
* more partially duplicate jumbo packets, we refuse to take any more
* jumbos for this call.
*/
if (!*_jumbo_dup) {
call->nr_jumbo_dup++;
*_jumbo_dup = true;
if (!*_jumbo_bad) {
call->nr_jumbo_bad++;
*_jumbo_bad = true;
}
}
@ -191,7 +191,7 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
unsigned int ix;
rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0;
rxrpc_seq_t seq = sp->hdr.seq, hard_ack;
bool immediate_ack = false, jumbo_dup = false, queued;
bool immediate_ack = false, jumbo_bad = false, queued;
u16 len;
u8 ack = 0, flags, annotation = 0;
@ -222,7 +222,7 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
flags = sp->hdr.flags;
if (flags & RXRPC_JUMBO_PACKET) {
if (call->nr_jumbo_dup > 3) {
if (call->nr_jumbo_bad > 3) {
ack = RXRPC_ACK_NOSPACE;
ack_serial = serial;
goto ack;
@ -259,7 +259,7 @@ next_subpacket:
}
if (call->rxtx_buffer[ix]) {
rxrpc_input_dup_data(call, seq, annotation, &jumbo_dup);
rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad);
if (ack != RXRPC_ACK_DUPLICATE) {
ack = RXRPC_ACK_DUPLICATE;
ack_serial = serial;
@ -304,6 +304,15 @@ skip:
annotation++;
if (flags & RXRPC_JUMBO_PACKET)
annotation |= RXRPC_RX_ANNO_JLAST;
if (after(seq, hard_ack + call->rx_winsize)) {
ack = RXRPC_ACK_EXCEEDS_WINDOW;
ack_serial = serial;
if (!jumbo_bad) {
call->nr_jumbo_bad++;
jumbo_bad = true;
}
goto ack;
}
_proto("Rx DATA Jumbo %%%u", serial);
goto next_subpacket;

5
net/rxrpc/misc.c
View File

@ -50,7 +50,10 @@ unsigned int rxrpc_idle_ack_delay = 0.5 * HZ;
* limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
* packets.
*/
unsigned int rxrpc_rx_window_size = RXRPC_RXTX_BUFF_SIZE - 46;
unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
#if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
#error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
#endif
/*
* Maximum Rx MTU size. This indicates to the sender the size of jumbo packet

4
net/rxrpc/output.c
View File

@ -71,10 +71,10 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
mtu = call->conn->params.peer->if_mtu;
mtu -= call->conn->params.peer->hdrsize;
jmax = (call->nr_jumbo_dup > 3) ? 1 : rxrpc_rx_jumbo_max;
jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
pkt->ackinfo.maxMTU = htonl(mtu);
pkt->ackinfo.rwind = htonl(rxrpc_rx_window_size);
pkt->ackinfo.rwind = htonl(call->rx_winsize);
pkt->ackinfo.jumbo_max = htonl(jmax);
*ackp++ = 0;

2
net/rxrpc/sysctl.c
View File

@ -20,7 +20,7 @@ static const unsigned int one = 1;
static const unsigned int four = 4;
static const unsigned int thirtytwo = 32;
static const unsigned int n_65535 = 65535;
static const unsigned int n_max_acks = RXRPC_MAXACKS;
static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
/*
* RxRPC operating parameters.