linux-kernel - [PATCH net 0/5] rxrpc: Miscellaneous fixes

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Date: Fri,  3 May 2024 16:07:38 +0100
From: David Howells <dhowells@...hat.com>
To: netdev@...r.kernel.org
Cc: David Howells <dhowells@...hat.com>,
	Marc Dionne <marc.dionne@...istor.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-afs@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net 0/5] rxrpc: Miscellaneous fixes

Here some miscellaneous fixes for AF_RXRPC:

 (1) Fix the congestion control algorithm to start cwnd at 4 and to not cut
     ssthresh when the peer cuts its rwind size.

 (2) Only transmit a single ACK for all the DATA packets glued together
     into a jumbo packet to reduce the number of ACKs being generated.

 (3) Clean up the generation of flags in the protocol header when creating
     a packet for transmission.  This means we don't carry the old
     REQUEST-ACK bit around from previous transmissions, will make it
     easier to fix the MORE-PACKETS flag and make it easier to do jumbo
     packet assembly in future.

 (4) Fix how the MORE-PACKETS flag is driven.  We shouldn't be setting it
     in sendmsg() as the packet is then queued and the bit is left in that
     state, no matter how long it takes us to transmit the packet - and
     will still be in that state if the packet is retransmitted.

 (5) Request an ACK on an impending transmission stall due to the app layer
     not feeding us new data fast enough.  If we don't request an ACK, we
     may have to hold on to the packet buffers for a significant amount of
     time until the receiver gets bored and sends us an ACK anyway.

David

---
The patches can be found here also:

	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-fixes

David Howells (5):
  rxrpc: Fix congestion control algorithm
  rxrpc: Only transmit one ACK per jumbo packet received
  rxrpc: Clean up Tx header flags generation handling
  rxrpc: Change how the MORE-PACKETS rxrpc wire header flag is driven
  rxrpc: Request an ACK on impending Tx stall

 include/trace/events/rxrpc.h |  2 +-
 net/rxrpc/ar-internal.h      |  2 +-
 net/rxrpc/call_object.c      |  7 +-----
 net/rxrpc/input.c            | 49 +++++++++++++++++++++++++-----------
 net/rxrpc/output.c           | 26 ++++++++++++++-----
 net/rxrpc/proc.c             |  6 ++---
 net/rxrpc/sendmsg.c          |  3 ---
 7 files changed, 61 insertions(+), 34 deletions(-)