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([2402:e280:21c6:671:6651:2efb:bfb:bd73]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-87feb385ed8sm3204478b3a.45.2026.09.27.12.09.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 12:09:29 -0700 (PDT) From: "Hemendra M. Naik" To: netdev-bot+sashiko@kernel.org Cc: davem@davemloft.net, edumazet@google.com, hemendranaik@gmail.com, horms@kernel.org, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, shuah@kernel.org, tahiliani@nitk.edu.in, vishy0777@gmail.com Subject: Re: [PATCH net-next v8 2/3] selftests: tc-testing: add fq_pie per-flow class stats test Date: Mon, 28 Sep 2026 00:39:15 +0530 Message-Id: <20260927190915.12527-1-hemendranaik@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <179028364138.2160803.8521628163584007831@kernel.org> References: <179028364138.2160803.8521628163584007831@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Thank you for the review. Our response to the low-severity comment is inline below. > [Severity: Low] > This is a robustness point, not a bug. fq_pie_walk() in > net/sched/sch_fq_pie.c only dumps flows that have a non-empty flowchain: > > if (list_empty(&q->flows[i].flowchain)) { > arg->count++; > continue; > } > > That makes this ping the only thing that gets class 2:1 into the output. > > In the standard tdc setup this works. nsPlugin runs the command inside > the namespace, dummy is NOARP, and the 98-byte frame fits under tbf's > max_size of 100. > > If ping is missing, or doesn't accept -i 0.001 / -W 0.01, the "|| true" > and the redirect hide the error. The test then fails as a regex mismatch > in the verify stage, not as a setup error. > > Should this step be allowed to fail visibly? The same pattern is already > used elsewhere in tc-testing (infra/qdiscs.json), so it may be fine as is. Keeping it as is. tc-tests/infra/qdiscs.json (test ca5e, "Check class delete notification for ffff:") already uses the identical pattern: "ping -c1 -W0.01 -I $DUMMY 10.10.10.1 || true", as a setup step whose only job is to push a packet through the qdisc, with the same silent-failure trade-off described above. 83c0 follows existing practice here rather than introducing a new one. Regards, Hemendra