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authorDavid Howells <dhowells@redhat.com>2022-10-16 10:01:32 +0300
committerDavid Howells <dhowells@redhat.com>2023-01-31 19:38:35 +0300
commitf21e93485bcbfa2753d1447b6198604a2c3d57be (patch)
tree6a50ed8c839f6b87d580aac1ac1f51d417e9c4e5 /net/rxrpc/ar-internal.h
parent5bbf953382bec6d3b7003e9389668c1d0863db31 (diff)
downloadlinux-f21e93485bcbfa2753d1447b6198604a2c3d57be.tar.xz
rxrpc: Simplify ACK handling
Now that general ACK transmission is done from the same thread as incoming DATA packet wrangling, there's no possibility that the SACK table will be being updated by the latter whilst the former is trying to copy it to an ACK. This means that we can safely rotate the SACK table whilst updating it without having to take a lock, rather than keeping all the bits inside it in fixed place and copying and then rotating it in the transmitter. Therefore, simplify SACK handing by keeping track of starting point in the ring and rotate slots down as we consume them. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
Diffstat (limited to 'net/rxrpc/ar-internal.h')
-rw-r--r--net/rxrpc/ar-internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 2ca99688f7f0..2b1d0d3ca064 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -691,6 +691,7 @@ struct rxrpc_call {
/* Receive-phase ACK management (ACKs we send). */
u8 ackr_reason; /* reason to ACK */
+ u16 ackr_sack_base; /* Starting slot in SACK table ring */
rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
rxrpc_seq_t ackr_window; /* Base of SACK window */
rxrpc_seq_t ackr_wtop; /* Base of SACK window */