kernel.git/drivers/net/ethernet/sfc, branch linux-5.14.y

sfc: Don't use netif_info before net_device setup

2021-11-17T10:03:29Z

[ Upstream commit bf6abf345dfa77786aca554bc58c64bd428ecb1d ] Use pci_info instead to avoid unnamed/uninitialized noise: [197088.688729] sfc 0000:01:00.0: Solarflare NIC detected [197088.690333] sfc 0000:01:00.0: Part Number : SFN5122F [197088.729061] sfc 0000:01:00.0 (unnamed net_device) (uninitialized): no SR-IOV VFs probed [197088.729071] sfc 0000:01:00.0 (unnamed net_device) (uninitialized): no PTP support Inspired by fa44821a4ddd ("sfc: don't use netif_info et al before net_device is registered") from Heiner Kallweit. Signed-off-by: Erik Ekman Acked-by: Martin Habets Signed-off-by: David S. Miller Signed-off-by: Sasha Levin

sfc: Export fibre-specific supported link modes

2021-11-17T10:03:29Z

[ Upstream commit c62041c5baa9ded3bc6fd38d3f724de70683b489 ] The 1/10GbaseT modes were set up for cards with SFP+ cages in 3497ed8c852a5 ("sfc: report supported link speeds on SFP connections"). 10GbaseT was likely used since no 10G fibre mode existed. The missing fibre modes for 1/10G were added to ethtool.h in 5711a9822144 ("net: ethtool: add support for 1000BaseX and missing 10G link modes") shortly thereafter. The user guide available at https://support-nic.xilinx.com/wp/drivers lists support for the following cable and transceiver types in section 2.9: - QSFP28 100G Direct Attach Cables - QSFP28 100G SR Optical Transceivers (with SR4 modules listed) - SFP28 25G Direct Attach Cables - SFP28 25G SR Optical Transceivers - QSFP+ 40G Direct Attach Cables - QSFP+ 40G Active Optical Cables - QSFP+ 40G SR4 Optical Transceivers - QSFP+ to SFP+ Breakout Direct Attach Cables - QSFP+ to SFP+ Breakout Active Optical Cables - SFP+ 10G Direct Attach Cables - SFP+ 10G SR Optical Transceivers - SFP+ 10G LR Optical Transceivers - SFP 1000BASE‐T Transceivers - 1G Optical Transceivers (From user guide issue 28. Issue 16 which also includes older cards like SFN5xxx/SFN6xxx has matching lists for 1/10/40G transceiver types.) Regarding SFP+ 10GBASE‐T transceivers the latest guide says: "Solarflare adapters do not support 10GBASE‐T transceiver modules." Tested using SFN5122F-R7 (with 2 SFP+ ports). Supported link modes do not change depending on module used (tested with 1000BASE-T, 1000BASE-BX10, 10GBASE-LR). Before: $ ethtool ext Settings for ext: Supported ports: [ FIBRE ] Supported link modes: 1000baseT/Full 10000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: No Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Link partner advertised link modes: Not reported Link partner advertised pause frame use: No Link partner advertised auto-negotiation: No Link partner advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Auto-negotiation: off Port: FIBRE PHYAD: 255 Transceiver: internal Current message level: 0x000020f7 (8439) drv probe link ifdown ifup rx_err tx_err hw Link detected: yes After: $ ethtool ext Settings for ext: Supported ports: [ FIBRE ] Supported link modes: 1000baseT/Full 1000baseX/Full 10000baseCR/Full 10000baseSR/Full 10000baseLR/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: No Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Link partner advertised link modes: Not reported Link partner advertised pause frame use: No Link partner advertised auto-negotiation: No Link partner advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Auto-negotiation: off Port: FIBRE PHYAD: 255 Transceiver: internal Supports Wake-on: g Wake-on: d Current message level: 0x000020f7 (8439) drv probe link ifdown ifup rx_err tx_err hw Link detected: yes Signed-off-by: Erik Ekman Acked-by: Martin Habets Signed-off-by: David S. Miller Signed-off-by: Sasha Levin

sfc: Fix reading non-legacy supported link modes

2021-11-06T13:11:28Z

commit 041c61488236a5a84789083e3d9f0a51139b6edf upstream. Everything except the first 32 bits was lost when the pause flags were added. This makes the 50000baseCR2 mode flag (bit 34) not appear. I have tested this with a 10G card (SFN5122F-R7) by modifying it to return a non-legacy link mode (10000baseCR). Signed-off-by: Erik Ekman Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

sfc: add logs explaining XDP_TX/REDIRECT is not available

2021-07-13T17:02:41Z

If it's not possible to allocate enough channels for XDP, XDP_TX and XDP_REDIRECT don't work. However, only a message saying that not enough channels were available was shown, but not saying what are the consequences in that case. The user didn't know if he/she can use XDP or not, if the performance is reduced, or what. Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller

sfc: ensure correct number of XDP queues

2021-07-13T17:02:41Z

Commit 99ba0ea616aa ("sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues") intended to fix a problem caused by a round up when calculating the number of XDP channels and queues. However, this was not the real problem. The real problem was that the number of XDP TX queues had been reduced to half in commit e26ca4b53582 ("sfc: reduce the number of requested xdp ev queues"), but the variable xdp_tx_queue_count had remained the same. Once the correct number of XDP TX queues is created again in the previous patch of this series, this also can be reverted since the error doesn't actually exist. Only in the case that there is a bug in the code we can have different values in xdp_queue_number and efx->xdp_tx_queue_count. Because of this, and per Edward Cree's suggestion, I add instead a WARN_ON to catch if it happens again in the future. Note that the number of allocated queues can be higher than the number of used ones due to the round up, as explained in the existing comment in the code. That's why we also have to stop increasing xdp_queue_number beyond efx->xdp_tx_queue_count. Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller

sfc: fix lack of XDP TX queues - error XDP TX failed (-22)

2021-07-13T17:02:41Z

Fixes: e26ca4b53582 sfc: reduce the number of requested xdp ev queues The buggy commit intended to allocate less channels for XDP in order to be more unlikely to reach the limit of 32 channels of the driver. The idea was to use each IRQ/eventqeue for more XDP TX queues than before, calculating which is the maximum number of TX queues that one event queue can handle. For example, in EF10 each event queue could handle up to 8 queues, better than the 4 they were handling before the change. This way, it would have to allocate half of channels than before for XDP TX. The problem is that the TX queues are also contained inside the channel structs, and there are only 4 queues per channel. Reducing the number of channels means also reducing the number of queues, resulting in not having the desired number of 1 queue per CPU. This leads to getting errors on XDP_TX and XDP_REDIRECT if they're executed from a high numbered CPU, because there only exist queues for the low half of CPUs, actually. If XDP_TX/REDIRECT is executed in a low numbered CPU, the error doesn't happen. This is the error in the logs (repeated many times, even rate limited): sfc 0000:5e:00.0 ens3f0np0: XDP TX failed (-22) This errors happens in function efx_xdp_tx_buffers, where it expects to have a dedicated XDP TX queue per CPU. Reverting the change makes again more likely to reach the limit of 32 channels in machines with many CPUs. If this happen, no XDP_TX/REDIRECT will be possible at all, and we will have this log error messages: At interface probe: sfc 0000:5e:00.0: Insufficient resources for 12 XDP event queues (24 other channels, max 32) At every subsequent XDP_TX/REDIRECT failure, rate limited: sfc 0000:5e:00.0 ens3f0np0: XDP TX failed (-22) However, without reverting the change, it makes the user to think that everything is OK at probe time, but later it fails in an unpredictable way, depending on the CPU that handles the packet. It is better to restore the predictable behaviour. If the user sees the error message at probe time, he/she can try to configure the best way it fits his/her needs. At least, he/she will have 2 options: - Accept that XDP_TX/REDIRECT is not available (he/she may not need it) - Load sfc module with modparam 'rss_cpus' with a lower number, thus creating less normal RX queues/channels, letting more free resources for XDP, with some performance penalty. Anyway, let the calculation of maximum TX queues that can be handled by a single event queue, and use it only if it's less than the number of TX queues per channel. This doesn't happen in practice, but could happen if some constant values are tweaked in the future, such us EFX_MAX_TXQ_PER_CHANNEL, EFX_MAX_EVQ_SIZE or EFX_MAX_DMAQ_SIZE. Related mailing list thread: https://lore.kernel.org/bpf/20201215104327.2be76156@carbon/ Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2021-06-29T22:45:27Z

Trivial conflict in net/netfilter/nf_tables_api.c. Duplicate fix in tools/testing/selftests/net/devlink_port_split.py - take the net-next version. skmsg, and L4 bpf - keep the bpf code but remove the flags and err params. Signed-off-by: Jakub Kicinski

sfc: Remove rcu_read_lock() around XDP program invocation

2021-06-24T17:46:01Z

The sfc driver has rcu_read_lock()/rcu_read_unlock() pairs around XDP program invocations. However, the actual lifetime of the objects referred by the XDP program invocation is longer, all the way through to the call to xdp_do_flush(), making the scope of the rcu_read_lock() too small. This turns out to be harmless because it all happens in a single NAPI poll cycle (and thus under local_bh_disable()), but it makes the rcu_read_lock() misleading. Rather than extend the scope of the rcu_read_lock(), just get rid of it entirely. With the addition of RCU annotations to the XDP_REDIRECT map types that take bh execution into account, lockdep even understands this to be safe, so there's really no reason to keep it around. Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Daniel Borkmann Acked-by: Edward Cree Cc: Martin Habets Link: https://lore.kernel.org/bpf/20210624160609.292325-17-toke@redhat.com

sfc: avoid duplicated code in ef10_sriov

2021-06-22T16:51:13Z

The fail path of efx_ef10_sriov_alloc_vf_vswitching is identical to the full content of efx_ef10_sriov_free_vf_vswitching, so replace it for a single call to efx_ef10_sriov_free_vf_vswitching. Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller

sfc: explain that "attached" VFs only refer to Xen

2021-06-22T16:51:13Z

During SRIOV disabling it is checked wether any VF is currently attached to a guest, using pci_vfs_assigned function. However, this check only works with VFs attached with Xen, not with vfio/KVM. Added comments clarifying this point. Also, replaced manual check of PCI_DEV_FLAGS_ASSIGNED flag and used the helper function pci_is_dev_assigned instead. Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller