Patch "rxrpc: Generate rtt_min" has been added to the 6.12-stable tree
gregkh at linuxfoundation.org
gregkh at linuxfoundation.org
Fri Aug 7 06:07:26 PDT 2026
This is a note to let you know that I've just added the patch titled
rxrpc: Generate rtt_min
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rxrpc-generate-rtt_min.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.
>From stable+bounces-296834-greg=kroah.com at vger.kernel.org Thu Aug 6 15:52:10 2026
From: Sasha Levin <sashal at kernel.org>
Date: Thu, 6 Aug 2026 09:49:59 -0400
Subject: rxrpc: Generate rtt_min
To: stable at vger.kernel.org
Cc: David Howells <dhowells at redhat.com>, Marc Dionne <marc.dionne at auristor.com>, linux-afs at lists.infradead.org, Jakub Kicinski <kuba at kernel.org>, Sasha Levin <sashal at kernel.org>
Message-ID: <20260806135003.602726-1-sashal at kernel.org>
From: David Howells <dhowells at redhat.com>
[ Upstream commit c637bd066841de6d0a204898a62f1d9bb8fa1b7f ]
Generate rtt_min as this is required by RACK-TLP.
Signed-off-by: David Howells <dhowells at redhat.com>
cc: Marc Dionne <marc.dionne at auristor.com>
cc: linux-afs at lists.infradead.org
Link: https://patch.msgid.link/20241204074710.990092-27-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
Stable-dep-of: e4d2878369d5 ("rxrpc: Fix irq-disabled in local_bh_enable()")
Signed-off-by: Sasha Levin <sashal at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
lib/win_minmax.c | 1 +
net/rxrpc/ar-internal.h | 2 ++
net/rxrpc/rtt.c | 20 ++++++++++++++++----
3 files changed, 19 insertions(+), 4 deletions(-)
--- a/lib/win_minmax.c
+++ b/lib/win_minmax.c
@@ -97,3 +97,4 @@ u32 minmax_running_min(struct minmax *m,
return minmax_subwin_update(m, win, &val);
}
+EXPORT_SYMBOL(minmax_running_min);
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -349,6 +349,8 @@ struct rxrpc_peer {
spinlock_t rtt_input_lock; /* RTT lock for input routine */
ktime_t rtt_last_req; /* Time of last RTT request */
unsigned int rtt_count; /* Number of samples we've got */
+ unsigned int rtt_taken; /* Number of samples taken (wrapping) */
+ struct minmax min_rtt; /* Estimated minimum RTT */
u32 srtt_us; /* smoothed round trip time << 3 in usecs */
u32 mdev_us; /* medium deviation */
--- a/net/rxrpc/rtt.c
+++ b/net/rxrpc/rtt.c
@@ -127,16 +127,27 @@ static void rxrpc_set_rto(struct rxrpc_p
peer->rto_us = rxrpc_bound_rto(rto);
}
-static void rxrpc_ack_update_rtt(struct rxrpc_peer *peer, long rtt_us)
+static void rxrpc_update_rtt_min(struct rxrpc_peer *peer, ktime_t resp_time, long rtt_us)
+{
+ /* Window size 5mins in approx usec (ipv4.sysctl_tcp_min_rtt_wlen) */
+ u32 wlen_us = 5ULL * NSEC_PER_SEC / 1024;
+
+ minmax_running_min(&peer->min_rtt, wlen_us, resp_time / 1024,
+ (u32)rtt_us ? : jiffies_to_usecs(1));
+}
+
+static void rxrpc_ack_update_rtt(struct rxrpc_peer *peer, ktime_t resp_time, long rtt_us)
{
if (rtt_us < 0)
return;
- //rxrpc_update_rtt_min(peer, rtt_us);
+ /* Update RACK min RTT [RFC8985 6.1 Step 1]. */
+ rxrpc_update_rtt_min(peer, resp_time, rtt_us);
+
rxrpc_rtt_estimator(peer, rtt_us);
rxrpc_set_rto(peer);
- /* RFC6298: only reset backoff on valid RTT measurement. */
+ /* Only reset backoff on valid RTT measurement [RFC6298]. */
peer->backoff = 0;
}
@@ -157,9 +168,10 @@ void rxrpc_peer_add_rtt(struct rxrpc_cal
return;
spin_lock(&peer->rtt_input_lock);
- rxrpc_ack_update_rtt(peer, rtt_us);
+ rxrpc_ack_update_rtt(peer, resp_time, rtt_us);
if (peer->rtt_count < 3)
peer->rtt_count++;
+ peer->rtt_taken++;
spin_unlock(&peer->rtt_input_lock);
trace_rxrpc_rtt_rx(call, why, rtt_slot, send_serial, resp_serial,
Patches currently in stable-queue which might be from sashal at kernel.org are
queue-6.12/wifi-brcmfmac-set-f2-blocksize-to-256-for-bcm43752.patch
queue-6.12/net-dsa-mt7530-check-bus-read-errors-in-the-mdio-reg.patch
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queue-6.12/usb-gadget-f_tcm-synchronize-delayed-set_alt-with-teardown.patch
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queue-6.12/media-uapi-rkisp-correct-name-version-enum.patch
queue-6.12/net-sxgbe-free-tx-rings-on-rx-allocation-failure.patch
queue-6.12/rtase-fix-double-free-of-multi-frag-skb-on-dma-map-f.patch
queue-6.12/usb-typec-ucsi-fix-race-condition-and-ordering-in-port-unregistration.patch
queue-6.12/drm-xe-introduce-xe_gt_dbg_printer.patch
queue-6.12/drm-fb-helper-allocate-and-release-fb_info-in-single-place.patch
queue-6.12/drm-xe-rtp-maintain-oa-whitelists-separately.patch
queue-6.12/pinctrl-qcom-sc8280xp-add-missing-wakeup-entries-for.patch
queue-6.12/forcedeth-fix-uaf-of-txrx_stats-in-nv_remove.patch
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queue-6.12/hid-logitech-dj-standardise-hid_report_enum-variable.patch
queue-6.12/scsi-libsas-fix-ha-resume-deadlock-and-hisi_sas-disk.patch
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queue-6.12/bluetooth-iso-fix-timeout-vs-sync_timeout-typo-in-ch.patch
queue-6.12/um-set-parent-death-signal-for-ubd-io-thread-process.patch
queue-6.12/net-sxgbe-check-descriptor-ring-allocation-failures.patch
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