** Description changed:
SRU Justification:
[ Impact ]
- * Commit 27d5e84e810b ("net: qrtr: ns: Limit the total number of nodes")
- introduced a hard cap of 64 on the number of QRTR nodes the namespace
- server (qrtr_ns) will track, including the host node itself.
- That limit was set as a DoS mitigation but is too low for legitimate
- large-scale deployments, such as Qualcomm AI200 systems, which register
- up to 384 QRTR nodes across their SoCs/cards.
+ * Commit 27d5e84e810b ("net: qrtr: ns: Limit the total number of nodes")
+ introduced a hard cap of 64 on the number of QRTR nodes the namespace
+ server (qrtr_ns) will track, including the host node itself.
+ That limit was set as a DoS mitigation but is too low for legitimate
+ large-scale deployments, such as Qualcomm AI200 systems, which register
+ up to 384 QRTR nodes across their SoCs/cards.
- * This patch fixes this issue by increasing the limit to 512.
+ * This patch fixes this issue by increasing the limit to 512.
- * This patch should be backported because it affects deployments with 63
- or more Qualcomm AI100/AI200 targets.
+ * This patch should be backported because it affects deployments with 64
+ or more Qualcomm AI100/AI200 targets.
[ Test Plan ]
- * Checking dmesg on an Ubuntu 24.04 system with at least 6.8.0-136-generic,
- having at least 64 remote QRTR nodes, it will show "QRTR clients exceed max
- node limit!" for every extra node.
- * Also, by running a QRTR client then sending a QRTR_TYPE_NEW_LOOKUP packet,
- only 64 nodes will show up (63 remote node + the local node).
- * After applying the fix, dmesg should no longer show the error message, and
- the lookup client will return a full list of nodes.
+ * Checking dmesg on an Ubuntu 24.04 system with at least 6.8.0-136-generic,
+ having at least 64 remote QRTR nodes, it will show "QRTR clients exceed max
+ node limit!" for every extra node.
+ * Also, by running a QRTR client then sending a QRTR_TYPE_NEW_LOOKUP packet,
+ only 64 nodes will show up (63 remote node + the local node).
+ * After applying the fix, dmesg should no longer show the error message, and
+ the lookup client will return a full list of nodes.
[Fix]
- * Cherry-pick upstream commit:
- ff194cffd586 ("net: qrtr: ns: Raise node count limit to 512")
+ * Cherry-pick upstream commit:
+ ff194cffd586 ("net: qrtr: ns: Raise node count limit to 512")
[ Where problems could occur ]
- * If a deployment exceeds 512 nodes, the original symptom returns identically
- (same log message, same rejection behavior).
+ * If a deployment exceeds 512 nodes, the original symptom returns identically
+ (same log message, same rejection behavior).
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https://bugs.launchpad.net/bugs/2165140
Title:
qrtr: ns: node limit of 64 breaks QRTR routing on large multi-node
deployments
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