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Fri, 8 Aug 2025 12:54:00 +0000 Date: Fri, 8 Aug 2025 14:53:46 +0200 From: Michal Kubiak To: Alexander Lobakin CC: Jacob Keller , , , , , , Subject: Re: [Intel-wired-lan] [PATCH iwl-next 0/3] ice: convert Rx path to Page Pool Message-ID: References: <20250704161859.871152-1-michal.kubiak@intel.com> <7bbc6b88-760a-4158-bb65-8058393a731d@intel.com> <5a48f9b2-9a7f-4887-919c-cd99d8468c44@intel.com> <90721496-8458-4c57-9d1c-2f2bb4f4325f@intel.com> <4bac1eca-007c-4df2-9b35-d9ce5b787410@intel.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4bac1eca-007c-4df2-9b35-d9ce5b787410@intel.com> X-ClientProxiedBy: DB8PR04CA0004.eurprd04.prod.outlook.com (2603:10a6:10:110::14) To DS0PR11MB8665.namprd11.prod.outlook.com (2603:10b6:8:1b8::6) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB8665:EE_|PH0PR11MB7493:EE_ X-MS-Office365-Filtering-Correlation-Id: fcc7b6f7-e1c6-4d2a-d522-08ddd67aa55a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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> > struct ice_rx_ring *next; /* pointer to next ring in > > q_vector */ > > struct xsk_buff_pool *xsk_pool; > > - u32 nr_frags; > > u16 rx_buf_len; > > dma_addr_t dma; /* physical address of ring */ > > u8 dcb_tc; /* Traffic class of ring */ > > diff --git i/drivers/net/ethernet/intel/ice/ice_txrx.c > > w/drivers/net/ethernet/intel/ice/ice_txrx.c > > index 062291dac99c..403b5c54fd2a 100644 > > --- i/drivers/net/ethernet/intel/ice/ice_txrx.c > > +++ w/drivers/net/ethernet/intel/ice/ice_txrx.c > > @@ -831,8 +831,7 @@ static int ice_clean_rx_irq(struct ice_rx_ring > > *rx_ring, int budget) > > > > /* retrieve a buffer from the ring */ > > rx_buf = &rx_ring->rx_fqes[ntc]; > > - if (!libeth_xdp_process_buff(xdp, rx_buf, size)) > > - break; > > + libeth_xdp_process_buff(xdp, rx_buf, size); > > > > if (++ntc == cnt) > > ntc = 0; > > @@ -852,25 +851,18 @@ static int ice_clean_rx_irq(struct ice_rx_ring > > *rx_ring, int budget) > > > > xdp->data = NULL; > > rx_ring->first_desc = ntc; > > - rx_ring->nr_frags = 0; > > continue; > > construct_skb: > > skb = xdp_build_skb_from_buff(&xdp->base); > > + xdp->data = NULL; > > + rx_ring->first_desc = ntc; > > > > /* exit if we failed to retrieve a buffer */ > > if (!skb) { > > - rx_ring->ring_stats->rx_stats.alloc_page_failed++; > > - xdp_verdict = ICE_XDP_CONSUMED; > > - xdp->data = NULL; > > - rx_ring->first_desc = ntc; > > - rx_ring->nr_frags = 0; > > + rx_ring->ring_stats->rx_stats.alloc_buf_failed++; > > break; > > } > > > > - xdp->data = NULL; > > - rx_ring->first_desc = ntc; > > - rx_ring->nr_frags = 0; > > - > > stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S); > > if (unlikely(ice_test_staterr(rx_desc->wb.status_error0, > > stat_err_bits))) { > > More or less. I'm taking over this series since Michał's on a vacation, > I'll double check everything (against iavf and idpf as well). > > Anyway, thanks for the fix. > > > > > > > --->8--- > > > > The essential change is to not break if libeth_xdp_process_buff returns > > false, since we still need to move the ring forward in this case, and > > the usual reason it returns false is the zero-length descriptor we > > sometimes get when using larger MTUs. > > > > I also dropped some of the updates and re-ordered how we assign > > xdp->data, and fixed the bug with the ring stats using alloc_page_failed > > instead of alloc_buf_failed like we should have. I think this could be > > further improved or cleaned up, but might be better to wait until the > > full usage of the XDP helpers. > > > > Regardless, we need something like this to fix the issues with larger MTU. > > Thanks, > Olek Dear Jake and Olek, Thanks for your support, detailed testing and fixes! I successfully reproduced the crash during stress testing the series using: - MTU == 9k, - iperf3 (for UDP traffic), - heavy HTTP workload running 20 threads and 100000 connections. After applying the fixes for v2, I observed no issues. Thanks, Michal