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rxrpc: Only transmit one ACK per jumbo packet received 

Only generate one ACK packet for all the subpackets in a jumbo packet.  If
we would like to generate more than one ACK, we prioritise them base on
their reason code, in the order, highest first:

   OutOfSeq > NoSpace > ExceedsWin > Duplicate > Requested > Delay > Idle

For the first four, we reference the lowest offending subpacket; for the
last three, the highest.

This reduces the number of ACKs we end up transmitting to one per UDP
packet transmitted to reduce network loading and packet parsing.

Fixes: 5d7edbc923 ("rxrpc: Get rid of the Rx ring")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Reviewed-by: Jeffrey Altman <jaltman@auristor.com <mailto:jaltman@auristor.com>>
Link: https://lore.kernel.org/r/20240503150749.1001323-3-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Howells 2024-05-03 16:07:40 +01:00 committed by Jakub Kicinski
parent ba4e103848
commit 012b720691
1 changed files with 35 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
net/rxrpc/input.c
View File

@ -9,6 +9,17 @@
#include "ar-internal.h"
/* Override priority when generating ACKs for received DATA */
static const u8 rxrpc_ack_priority[RXRPC_ACK__INVALID] = {
[RXRPC_ACK_IDLE] = 1,
[RXRPC_ACK_DELAY] = 2,
[RXRPC_ACK_REQUESTED] = 3,
[RXRPC_ACK_DUPLICATE] = 4,
[RXRPC_ACK_EXCEEDS_WINDOW] = 5,
[RXRPC_ACK_NOSPACE] = 6,
[RXRPC_ACK_OUT_OF_SEQUENCE] = 7,
};
static void rxrpc_proto_abort(struct rxrpc_call *call, rxrpc_seq_t seq,
enum rxrpc_abort_reason why)
{
@ -365,7 +376,7 @@ static void rxrpc_input_queue_data(struct rxrpc_call *call, struct sk_buff *skb,
* Process a DATA packet.
*/
static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb,
bool *_notify)
bool *_notify, rxrpc_serial_t *_ack_serial, int *_ack_reason)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct sk_buff *oos;
@ -418,8 +429,6 @@ static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb,
/* Send an immediate ACK if we fill in a hole */
else if (!skb_queue_empty(&call->rx_oos_queue))
ack_reason = RXRPC_ACK_DELAY;
else
call->ackr_nr_unacked++;
window++;
if (after(window, wtop)) {
@ -497,12 +506,16 @@ static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb,
}
send_ack:
if (ack_reason >= 0)
rxrpc_send_ACK(call, ack_reason, serial,
rxrpc_propose_ack_input_data);
else
rxrpc_propose_delay_ACK(call, serial,
rxrpc_propose_ack_input_data);
if (ack_reason >= 0) {
if (rxrpc_ack_priority[ack_reason] > rxrpc_ack_priority[*_ack_reason]) {
*_ack_serial = serial;
*_ack_reason = ack_reason;
} else if (rxrpc_ack_priority[ack_reason] == rxrpc_ack_priority[*_ack_reason] &&
ack_reason == RXRPC_ACK_REQUESTED) {
*_ack_serial = serial;
*_ack_reason = ack_reason;
}
}
}
/*
@ -513,9 +526,11 @@ static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb
struct rxrpc_jumbo_header jhdr;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb), *jsp;
struct sk_buff *jskb;
rxrpc_serial_t ack_serial = 0;
unsigned int offset = sizeof(struct rxrpc_wire_header);
unsigned int len = skb->len - offset;
bool notify = false;
int ack_reason = 0;
while (sp->hdr.flags & RXRPC_JUMBO_PACKET) {
if (len < RXRPC_JUMBO_SUBPKTLEN)
@ -535,7 +550,7 @@ static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb
jsp = rxrpc_skb(jskb);
jsp->offset = offset;
jsp->len = RXRPC_JUMBO_DATALEN;
rxrpc_input_data_one(call, jskb, &notify);
rxrpc_input_data_one(call, jskb, &notify, &ack_serial, &ack_reason);
rxrpc_free_skb(jskb, rxrpc_skb_put_jumbo_subpacket);
sp->hdr.flags = jhdr.flags;
@ -548,7 +563,16 @@ static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb
sp->offset = offset;
sp->len = len;
rxrpc_input_data_one(call, skb, &notify);
rxrpc_input_data_one(call, skb, &notify, &ack_serial, &ack_reason);
if (ack_reason > 0) {
rxrpc_send_ACK(call, ack_reason, ack_serial,
rxrpc_propose_ack_input_data);
} else {
call->ackr_nr_unacked++;
rxrpc_propose_delay_ACK(call, sp->hdr.serial,
rxrpc_propose_ack_input_data);
}
if (notify) {
trace_rxrpc_notify_socket(call->debug_id, sp->hdr.serial);
rxrpc_notify_socket(call);