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path: root/drivers/net/ethernet/mediatek/airoha_eth.c
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2025-03-04net: airoha: Move airoha_eth driver in a dedicated folderLorenzo Bianconi1-3361/+0
The airoha_eth driver has no codebase shared with mtk_eth_soc one. Moreover, the upcoming features (flowtable hw offloading, PCS, ..) will not reuse any code from MediaTek driver. Move the Airoha driver in a dedicated folder. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-02-15net: airoha: Fix TSO support for header cloned skbsLorenzo Bianconi1-5/+5
For GSO packets, skb_cow_head() will reallocate the skb for TSO header cloned skbs in airoha_dev_xmit(). For this reason, sinfo pointer can be no more valid. Fix the issue relying on skb_shinfo() macro directly in airoha_dev_xmit(). The problem exists since commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") but it is not a user visible, since we can't currently enable TSO for DSA user ports since we are missing to initialize net_device vlan_features field. Reviewed-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20250213-airoha-en7581-flowtable-offload-v4-1-b69ca16d74db@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-01-23net: airoha: Fix wrong GDM4 register definitionChristian Marangi1-2/+2
Fix wrong GDM4 register definition, in Airoha SDK GDM4 is defined at offset 0x2400 but this doesn't make sense as it does conflict with the CDM4 that is in the same location. Following the pattern where each GDM base is at the FWD_CFG, currently GDM4 base offset is set to 0x2500. This is correct but REG_GDM4_FWD_CFG and REG_GDM4_SRC_PORT_SET are still using the SDK reference with the 0x2400 offset. Fix these 2 define by subtracting 0x100 to each register to reflect the real address location. Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Link: https://patch.msgid.link/20250120154148.13424-1-ansuelsmth@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-01-15net: airoha: Enforce ETS Qdisc priomapLorenzo Bianconi1-2/+15
EN7581 SoC supports fixed QoS band priority where WRR queues have lowest priorities with respect to SP ones. E.g: WRR0, WRR1, .., WRRm, SP0, SP1, .., SPn Enforce ETS Qdisc priomap according to the hw capabilities. Suggested-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Davide Caratti <dcaratti@redhat.com> Link: https://patch.msgid.link/20250112-airoha_ets_priomap-v1-1-fb616de159ba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-01-12net: airoha: Fix channel configuration for ETS QdiscLorenzo Bianconi1-1/+4
Limit ETS QoS channel to AIROHA_NUM_QOS_CHANNELS in airoha_tc_setup_qdisc_ets() in order to align the configured channel to the value set in airoha_dev_select_queue(). Fixes: 20bf7d07c956 ("net: airoha: Add sched ETS offload support") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> Link: https://patch.msgid.link/20250107-airoha-ets-fix-chan-v1-1-97f66ed3a068@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-01-07net: airoha: Add sched HTB offload supportLorenzo Bianconi1-1/+287
Introduce support for HTB Qdisc offload available in the Airoha EN7581 ethernet controller. EN7581 can offload only one level of HTB leafs. Each HTB leaf represents a QoS channel supported by EN7581 SoC. The typical use-case is creating a HTB leaf for QoS channel to rate limit the egress traffic and attach an ETS Qdisc to each HTB leaf in order to enforce traffic prioritization. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-01-07net: airoha: Add sched ETS offload supportLorenzo Bianconi1-1/+195
Introduce support for ETS Qdisc offload available on the Airoha EN7581 ethernet controller. In order to be effective, ETS Qdisc must configured as leaf of a HTB Qdisc (HTB Qdisc offload will be added in the following patch). ETS Qdisc available on EN7581 ethernet controller supports at most 8 concurrent bands (QoS queues). We can enable an ETS Qdisc for each available QoS channel. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-01-07net: airoha: Introduce ndo_select_queue callbackLorenzo Bianconi1-2/+28
Airoha EN7581 SoC supports 32 Tx DMA rings used to feed packets to QoS channels. Each channels supports 8 QoS queues where the user can apply QoS scheduling policies. In a similar way, the user can configure hw rate shaping for each QoS channel. Introduce ndo_select_queue callback in order to select the tx queue based on QoS channel and QoS queue. In particular, for dsa device select QoS channel according to the dsa user port index, rely on port id otherwise. Select QoS queue based on the skb priority. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-01-07net: airoha: Enable Tx drop capability for each Tx DMA ringLorenzo Bianconi1-0/+4
This is a preliminary patch in order to enable hw Qdisc offloading. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-12-20net: airoha: Fix error path in airoha_probe()Lorenzo Bianconi1-8/+25
Do not run napi_disable() if airoha_hw_init() fails since Tx/Rx napi has not been started yet. In order to fix the issue, introduce airoha_qdma_stop_napi routine and remove napi_disable in airoha_hw_cleanup(). Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20241216-airoha_probe-error-path-fix-v2-1-6b10e04e9a5c@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-11-03net: airoha: Simplify Tx napi logicLorenzo Bianconi1-32/+41
Simplify Tx napi logic relying just on the packet index provided by completion queue indicating the completed packet that can be removed from the Tx DMA ring. This is a preliminary patch to add Qdisc offload for airoha_eth driver. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20241029-airoha-en7581-tx-napi-work-v1-2-96ad1686b946@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-11-03net: airoha: Read completion queue data in airoha_qdma_tx_napi_poll()Lorenzo Bianconi1-18/+13
In order to avoid any possible race, read completion queue head and pending entry in airoha_qdma_tx_napi_poll routine instead of doing it in airoha_irq_handler. Remove unused airoha_tx_irq_queue unused fields. This is a preliminary patch to add Qdisc offload for airoha_eth driver. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20241029-airoha-en7581-tx-napi-work-v1-1-96ad1686b946@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-20net: airoha: Reset BQL stopping the netdeviceLorenzo Bianconi1-1/+9
Run airoha_qdma_cleanup_tx_queue() in ndo_stop callback in order to unmap pending skbs. Moreover, reset BQL txq state stopping the netdevice, Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Hariprasad Kelam <hkelam@marvell.com> Message-ID: <20241017-airoha-en7581-reset-bql-v1-1-08c0c9888de5@kernel.org> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
2024-10-18net: airoha: Fix typo in REG_CDM2_FWD_CFG configurationLorenzo Bianconi1-1/+2
Fix typo in airoha_fe_init routine configuring CDM2_OAM_QSEL_MASK field of REG_CDM2_FWD_CFG register. This bug is not introducing any user visible problem since Frame Engine CDM2 port is used just by the second QDMA block and we currently enable just QDMA1 block connected to the MT7530 dsa switch via CDM1 port. Introduced by commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Reported-by: ChihWei Cheng <chihwei.cheng@airoha.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Message-ID: <20241015-airoha-eth-cdm2-fixes-v1-1-9dc6993286c3@kernel.org> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
2024-10-15net: airoha: Implement BQL supportLorenzo Bianconi1-2/+6
Introduce BQL support in the airoha_eth driver reporting to the kernel info about tx hw DMA queues in order to avoid bufferbloat and keep the latency small. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20241012-en7581-bql-v2-1-4deb4efdb60b@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-10Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-4/+5
Cross-merge networking fixes after downstream PR (net-6.12-rc3). No conflicts and no adjacent changes. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-10net: airoha: Fix EGRESS_RATE_METER_EN_MASK definitionLorenzo Bianconi1-1/+1
Fix typo in EGRESS_RATE_METER_EN_MASK mask definition. This bus in not introducing any user visible problem since, even if we are setting EGRESS_RATE_METER_EN_MASK bit in REG_EGRESS_RATE_METER_CFG register, egress QoS metering is not supported yet since we are missing some other hw configurations (e.g token bucket rate, token bucket size). Introduced by commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241009-airoha-fixes-v2-1-18af63ec19bf@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-08net: airoha: Update tx cpu dma ring idx at the end of xmit loopLorenzo Bianconi1-4/+5
Move the tx cpu dma ring index update out of transmit loop of airoha_dev_xmit routine in order to not start transmitting the packet before it is fully DMA mapped (e.g. fragmented skbs). Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Reported-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241004-airoha-eth-7581-mapping-fix-v1-1-8e4279ab1812@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-05net: ethernet: Switch back to struct platform_driver::remove()Uwe Kleine-König1-1/+1
After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/net/ethernet to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/18f7c585a1a8a8ac8b03a2fca7de19bd5c52ac2b.1727949050.git.u.kleine-koenig@baylibre.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-04net: airoha: fix PSE memory configuration in airoha_fe_pse_ports_init()Lorenzo Bianconi1-2/+4
Align PSE memory configuration to vendor SDK. In particular, increase initial value of PSE reserved memory in airoha_fe_pse_ports_init() routine by the value used for the second Packet Processor Engine (PPE2) and do not overwrite the default value. Introduced by commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241001-airoha-eth-pse-fix-v2-2-9a56cdffd074@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-10-04net: airoha: read default PSE reserved pages value before updatingLorenzo Bianconi1-4/+10
Store the default value for the number of PSE reserved pages in orig_val at the beginning of airoha_fe_set_pse_oq_rsv routine, before updating it with airoha_fe_set_pse_queue_rsv_pages(). Introduce airoha_fe_get_pse_all_rsv utility routine. Introduced by commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241001-airoha-eth-pse-fix-v2-1-9a56cdffd074@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-28net: airoha: fix module autoloadingLiao Chen1-0/+1
Add MODULE_DEVICE_TABLE(), so modules could be properly autoloaded based on the alias from of_device_id table. Signed-off-by: Liao Chen <liaochen4@huawei.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20240826091858.369910-4-liaochen4@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-22net: airoha: configure hw mac address according to the port idLorenzo Bianconi1-9/+23
GDM1 port on EN7581 SoC is connected to the lan dsa switch. GDM{2,3,4} can be used as wan port connected to an external phy module. Configure hw mac address registers according to the port id. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/20240821-airoha-eth-wan-mac-addr-v2-1-8706d0cd6cd5@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-08-06net: airoha: honor reset return value in airoha_hw_init()Lorenzo Bianconi1-4/+12
Take into account return value from reset_control_bulk_assert and reset_control_bulk_deassert routines in airoha_hw_init(). Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/f49dc04a87653e0155f4fab3e3eb584785c8ad6a.1722699555.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Link the gdm port to the selected qdma controllerLorenzo Bianconi1-18/+19
Link the running gdm port to the qdma controller used to connect with the CPU. Moreover, load all QDMA controllers available on EN7581 SoC. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/95b515df34ba4727f7ae5b14a1d0462cceec84ff.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Start all qdma NAPIs in airoha_probe()Lorenzo Bianconi1-3/+4
This is a preliminary patch to support multi-QDMA controllers. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/b51cf69c94d8cbc81e0a0b35587f024d01e6d9c0.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Allow mapping IO region for multiple qdma controllersLorenzo Bianconi1-24/+32
Map MMIO regions of both qdma controllers available on EN7581 SoC. Run airoha_hw_cleanup routine for both QDMA controllers available on EN7581 SoC removing airoha_eth module or in airoha_probe error path. This is a preliminary patch to support multi-QDMA controllers. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/a734ae608da14b67ae749b375d880dbbc70868ea.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Use qdma pointer as private structure in airoha_irq_handler routineLorenzo Bianconi1-4/+3
This is a preliminary patch to support multi-QDMA controllers. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/1e40c3cb973881c0eb3c3c247c78550da62054ab.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Add airoha_qdma pointer in airoha_tx_irq_queue/airoha_queue ↵Lorenzo Bianconi1-43/+41
structures Move airoha_eth pointer in airoha_qdma structure from airoha_tx_irq_queue/airoha_queue ones. This is a preliminary patch to introduce support for multi-QDMA controllers available on EN7581. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/074565b82fd0ceefe66e186f21133d825dbd48eb.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Move irq_mask in airoha_qdma structureLorenzo Bianconi1-42/+42
QDMA controllers have independent irq lines, so move irqmask in airoha_qdma structure. This is a preliminary patch to support multiple QDMA controllers. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/1c8a06e8be605278a7b2f3cd8ac06e74bf5ebf2b.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Move airoha_queues in airoha_qdmaLorenzo Bianconi1-61/+65
QDMA controllers available in EN7581 SoC have independent tx/rx hw queues so move them in airoha_queues structure. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/795fc4797bffbf7f0a1351308aa9bf0e65b5126e.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-03net: airoha: Introduce airoha_qdma structLorenzo Bianconi1-85/+112
Introduce airoha_qdma struct and move qdma IO register mapping in airoha_qdma. This is a preliminary patch to enable both QDMA controllers available on EN7581 SoC. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/7df163bdc72ee29c3d27a0cbf54522ffeeafe53c.1722522582.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-07-23net: airoha: Fix MBI_RX_AGE_SEL_MASK definitionLorenzo Bianconi1-1/+1
Fix copy-paste error in MBI_RX_AGE_SEL_MASK macro definition Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/d27d0465be1bff3369e886e5f10c4d37fefc4934.1721419930.git.lorenzo@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-07-18net: airoha: Fix NULL pointer dereference in airoha_qdma_cleanup_rx_queue()Lorenzo Bianconi1-2/+1
Move page_pool_get_dma_dir() inside the while loop of airoha_qdma_cleanup_rx_queue routine in order to avoid possible NULL pointer dereference if airoha_qdma_init_rx_queue() fails before properly allocating the page_pool pointer. Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/7330a41bba720c33abc039955f6172457a3a34f0.1721205981.git.lorenzo@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-07-18net: airoha: fix error branch in airoha_dev_xmit and airoha_set_gdm_portsLorenzo Bianconi1-4/+6
Fix error case management in airoha_dev_xmit routine since we need to DMA unmap pending buffers starting from q->head. Moreover fix a typo in error case branch in airoha_set_gdm_ports routine. Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC") Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/b628871bc8ae4861b5e2ab4db90aaf373cbb7cee.1721203880.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-07-14net: airoha: Introduce ethernet support for EN7581 SoCLorenzo Bianconi1-0/+2730
Add airoha_eth driver in order to introduce ethernet support for Airoha EN7581 SoC available on EN7581 development board (en7581-evb). EN7581 mac controller is mainly composed by the Frame Engine (PSE+PPE) and QoS-DMA (QDMA) modules. FE is used for traffic offloading (just basic functionalities are currently supported) while QDMA is used for DMA operations and QOS functionalities between the mac layer and the external modules conncted to the FE GDM ports (e.g MT7530 DSA switch or external phys). A general overview of airoha_eth architecture is reported below: ┌───────┐ ┌───────┐ │ QDMA2 │ │ QDMA1 │ └───┬───┘ └───┬───┘ │ │ ┌───────▼─────────────────────────────────────────────▼────────┐ │ │ │ P5 P0 │ │ │ │ │ │ │ ┌──────┐ │ P3 ├────► GDM3 │ │ │ └──────┘ │ │ │ │ ┌─────┐ │ │ │ PPE ◄────┤ P4 PSE │ └─────┘ │ │ │ │ │ │ │ │ ┌──────┐ │ P9 ├────► GDM4 │ │ │ └──────┘ │ │ │ │ │ │ │ P2 P1 │ └─────────┬───────────────────────────────────────────┬────────┘ │ │ ┌───▼──┐ ┌──▼───┐ │ GDM2 │ │ GDM1 │ └──────┘ └──┬───┘ │ ┌────▼─────┐ │ MT7530 │ └──────────┘ Currently only hw LAN features (QDMA1+GDM1) are available while hw WAN (QDMA2+GDM{2,3,4}) ones will be added with subsequent patches introducing traffic offloading support. Tested-by: Benjamin Larsson <benjamin.larsson@genexis.eu> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://patch.msgid.link/274945d2391c195098ab180a46d0617b18b9e42c.1720818878.git.lorenzo@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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