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Tue, 27 Oct 2026 20:44:43 +0000 Message-ID: Date: Tue, 27 Oct 2026 13:44:40 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net 1/3] igc: pad preemptible packets before reserving TX timestamps To: Paul Moses , CC: , , , , , , , , , , , , , , , , , References: <20261026091549.605810-1-p@1g4.org> <179310342759.3134.9480442291648763504@kernel.org> Content-Language: en-US From: Jacob Keller In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0227.namprd04.prod.outlook.com (2603:10b6:303:87::22) To DS0PR11MB7381.namprd11.prod.outlook.com (2603:10b6:8:134::14) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7381:EE_|SA2PR11MB4780:EE_ X-MS-Office365-Filtering-Correlation-Id: 93000f08-e585-40f3-58a1-08df346b20f6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|23010399003|1800799024|7416014|22082099003|18002099003|6133799003|261026121527099003|56012099006|4143699003|11063799006|10067099003|261021121427099003|261021135927099003; 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Can the same shared skb problem come >> up here? >> >> When a GSO skb with a cloned header (for example with a packet tap or tc >> mirred active) is hardware timestamped: >> >> igc_xmit_frame_ring() >> igc_request_tx_tstamp() >> tstamp->skb = skb_get(skb); >> igc_tso() >> skb_cow_head(skb, 0) >> __skb_cow() >> pskb_expand_head() >> BUG_ON(skb_shared(skb)); >> >> igc_tx_csum() can reach pskb_expand_head() the same way, through >> skb_checksum_help()->skb_ensure_writable(), on a cloned skb. >> >> The next patch in this series, "igc: prepare TSO and checksum offloads >> before TX timestamps", moves igc_tso() and igc_tx_csum() ahead of the >> timestamp reservation. That fixes this by the end of the series. Should >> the two patches be backported together, since this one alone leaves the >> TSO and checksum paths exposed? >> > > Yes, I maybe need to research how to properly denote this Personally, I think its clear from the series context. Thanks, Jake