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- 09 Mar, 2023 5 commits
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Bjorn Helgaas authored
pci_enable_pcie_error_reporting() enables the device to send ERR_* Messages. Since f26e58bf ("PCI/AER: Enable error reporting when AER is native"), the PCI core does this for all devices during enumeration, so the driver doesn't need to do it itself. Remove the redundant pci_enable_pcie_error_reporting() call from the driver. Also remove the corresponding pci_disable_pcie_error_reporting() from the driver .remove() path. Note that this only controls ERR_* Messages from the device. An ERR_* Message may cause the Root Port to generate an interrupt, depending on the AER Root Error Command register managed by the AER service driver. Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Cc: Ariel Elior <aelior@marvell.com> Cc: Sudarsana Kalluru <skalluru@marvell.com> Cc: Manish Chopra <manishc@marvell.com> Acked-by:
Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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Bjorn Helgaas authored
pci_enable_pcie_error_reporting() enables the device to send ERR_* Messages. Since f26e58bf ("PCI/AER: Enable error reporting when AER is native"), the PCI core does this for all devices during enumeration, so the driver doesn't need to do it itself. Remove the redundant pci_enable_pcie_error_reporting() call from the driver. Also remove the corresponding pci_disable_pcie_error_reporting() from the driver .remove() path. Note that this only controls ERR_* Messages from the device. An ERR_* Message may cause the Root Port to generate an interrupt, depending on the AER Root Error Command register managed by the AER service driver. cd709aa9 ("bnx2: Add PCI Advanced Error Reporting support.") added pci_enable_pcie_error_reporting() for all devices, and c239f279 ("bnx2: Enable AER on PCIE devices only") restricted it to BNX2_CHIP_5709 devices to avoid an error message when it failed on non-PCIe devices. The PCI core only enables PCIe error reporting on PCIe devices, which I assume means BNX2_CHIP_5709. Signed-off-by:
Michael Chan <michael.chan@broadcom.com> Acked-by:
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Bjorn Helgaas authored
pci_enable_pcie_error_reporting() enables the device to send ERR_* Messages. Since f26e58bf ("PCI/AER: Enable error reporting when AER is native"), the PCI core does this for all devices during enumeration, so the driver doesn't need to do it itself. Remove the redundant pci_enable_pcie_error_reporting() call from the driver. Also remove the corresponding pci_disable_pcie_error_reporting() from the driver .remove() path. Note that this only controls ERR_* Messages from the device. An ERR_* Message may cause the Root Port to generate an interrupt, depending on the AER Root Error Command register managed by the AER service driver. Signed-off-by:
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Bjorn Helgaas authored
pci_enable_pcie_error_reporting() enables the device to send ERR_* Messages. Since f26e58bf ("PCI/AER: Enable error reporting when AER is native"), the PCI core does this for all devices during enumeration, so the driver doesn't need to do it itself. Remove the redundant pci_enable_pcie_error_reporting() call from the driver. Also remove the corresponding pci_disable_pcie_error_reporting() from the driver .remove() path. Note that this only controls ERR_* Messages from the device. An ERR_* Message may cause the Root Port to generate an interrupt, depending on the AER Root Error Command register managed by the AER service driver. Signed-off-by:
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Wolfram Sang authored
R-Car H3 ES1.* was only available to an internal development group and needed a lot of quirks and workarounds. These become a maintenance burden now, so our development group decided to remove upstream support and disable booting for this SoC. Public users only have ES2 onwards. Reviewed-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by:
Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by:
Simon Horman <simon.horman@corigine.com> Reviewed-by:
Sergey Shtylyov <s.shtylyov@omp.ru> Link: https://lore.kernel.org/all/20230307163041.3815-8-wsa+renesas@sang-engineering.com/Signed-off-by:
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- 08 Mar, 2023 24 commits
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https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextJakub Kicinski authored
Andrii Nakryiko says: ==================== pull-request: bpf-next 2023-03-08 We've added 23 non-merge commits during the last 2 day(s) which contain a total of 28 files changed, 414 insertions(+), 104 deletions(-). The main changes are: 1) Add more precise memory usage reporting for all BPF map types, from Yafang Shao. 2) Add ARM32 USDT support to libbpf, from Puranjay Mohan. 3) Fix BTF_ID_LIST size causing problems in !CONFIG_DEBUG_INFO_BTF, from Nathan Chancellor. 4) IMA selftests fix, from Roberto Sassu. 5) libbpf fix in APK support code, from Daniel Müller. * https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (23 commits) selftests/bpf: Fix IMA test libbpf: USDT arm arg parsing support libbpf: Refactor parse_usdt_arg() to re-use code libbpf: Fix theoretical u32 underflow in find_cd() function bpf: enforce all maps having memory usage callback bpf: offload map memory usage bpf, net: xskmap memory usage bpf, net: sock_map memory usage bpf, net: bpf_local_storage memory usage bpf: local_storage memory usage bpf: bpf_struct_ops memory usage bpf: queue_stack_maps memory usage bpf: devmap memory usage bpf: cpumap memory usage bpf: bloom_filter memory usage bpf: ringbuf memory usage bpf: reuseport_array memory usage bpf: stackmap memory usage bpf: arraymap memory usage bpf: hashtab memory usage ... ==================== Link: https://lore.kernel.org/r/20230308193533.1671597-1-andrii@kernel.orgSigned-off-by:
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Roberto Sassu authored
Commit 62622dab ("ima: return IMA digest value only when IMA_COLLECTED flag is set") caused bpf_ima_inode_hash() to refuse to give non-fresh digests. IMA test #3 assumed the old behavior, that bpf_ima_inode_hash() still returned also non-fresh digests. Correct the test by accepting both cases. If the samples returned are 1, assume that the commit above is applied and that the returned digest is fresh. If the samples returned are 2, assume that the commit above is not applied, and check both the non-fresh and fresh digest. Fixes: 62622dab ("ima: return IMA digest value only when IMA_COLLECTED flag is set") Reported-by:
David Vernet <void@manifault.com> Signed-off-by:
Roberto Sassu <roberto.sassu@huawei.com> Signed-off-by:
Andrii Nakryiko <andrii@kernel.org> Reviewed-by:
Matt Bobrowski <mattbobrowski@google.com> Link: https://lore.kernel.org/bpf/20230308103713.1681200-1-roberto.sassu@huaweicloud.com
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Eric Dumazet authored
Commit 0091bfc8 ("io_uring/af_unix: defer registered files gc to io_uring release") added one bit to struct sk_buff. This structure is critical for networking, and we try very hard to not add bloat on it, unless absolutely required. For instance, we can use a specific destructor as a wrapper around unix_destruct_scm(), to identify skbs that unix_gc() has to special case. Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Pavel Begunkov <asml.silence@gmail.com> Cc: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Cc: Jens Axboe <axboe@kernel.dk> Reviewed-by:
Jens Axboe <axboe@kernel.dk> Reviewed-by:
Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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David S. Miller authored
Steen Hegelund says: ==================== Add support for TC flower templates in Sparx5 This adds support for the TC template mechanism in the Sparx5 flower filter implementation. Templates are as such handled by the TC framework, but when a template is created (using a chain id) there are by definition no filters on this chain (an error will be returned if there are any). If the templates chain id is one that is represented by a VCAP lookup, then when the template is created, we know that it is safe to use the keys provided in the template to change the keyset configuration for the (port, lookup) combination, if this is needed to improve the match on the template. The original port keyset configuration is captured in the template state information which is kept per port, so that when the template is deleted the port keyset configuration can be restored to its previous setting. The template also provides the protocol parameter which is the basic information that is used to find out which port keyset configuration needs to be changed. The VCAPs and lookups are slightly different when it comes to which keys, keysets and protocol are supported and used for selection, so in some cases a bit of tweaking is needed to find a useful match. This is done by e.g. removing a key that prevents the best matching keyset from being selected. The debugfs output that is provided for a port allows inspection of the currently used keyset in each of the VCAPs lookups. So when a template has been created the debugfs output allows you to verify if the keyset configuration has been changed successfully. ==================== Signed-off-by: -
Steen Hegelund authored
This adds support for using the "template add" and "template destroy" functionality to change the port keyset configuration. If the VCAP lookup already contains rules, the port keyset is left unchanged, as a change would make these rules unusable. When the template is destroyed the port keyset configuration is restored. The filters using the template chain will automatically be deleted by the TC framework. Signed-off-by:
Steen Hegelund <steen.hegelund@microchip.com> Signed-off-by:
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Steen Hegelund authored
With this its is now possible for clients (like TC) to change the port keyset configuration in the Sparx5 VCAPs. This is typically done per traffic class which is guided with the L3 protocol information. Before the change the current keyset configuration is collected in a list that is handed back to the client. Signed-off-by:
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Steen Hegelund authored
This adds a list that is used to collect the templates that are active on a port. This allows the template creation to change the port configuration and the template destruction to change it back. Signed-off-by:
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Steen Hegelund authored
This provides these 3 functions in the VCAP API: - Count the number of rules in a VCAP lookup (chain) - Remove a key from a VCAP rule - Find the keyset that gives the smallest rule list from a list of keysets Signed-off-by:
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Steen Hegelund authored
Correct the name used in the debugfs output. Signed-off-by:
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Arınç ÜNAL authored
The line endings must be preserved on gpio-controller, io-supply, and reset-gpios properties to look proper when the YAML file is parsed. Currently it's interpreted as a single line when parsed. Change the style of the description of these properties to literal style to preserve the line endings. Signed-off-by:
Arınç ÜNAL <arinc.unal@arinc9.com> Acked-by:
Rob Herring <robh@kernel.org> Signed-off-by:
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Jiapeng Chong authored
No functional modification involved. drivers/net/ethernet/emulex/benet/be_cmds.c:1120 be_cmd_pmac_add() warn: inconsistent indenting. Reported-by:
Abaci Robot <abaci@linux.alibaba.com> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4396Signed-off-by:
Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by:
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Gustavo A. R. Silva authored
Zero-length arrays as fake flexible arrays are deprecated and we are moving towards adopting C99 flexible-array members instead. Transform zero-length array into flexible-array member in struct mlx4_en_rx_desc. Address the following warnings found with GCC-13 and -fstrict-flex-arrays=3 enabled: drivers/net/ethernet/mellanox/mlx4/en_rx.c:88:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:149:30: warning: array subscript 0 is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:127:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:128:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:129:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:117:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] drivers/net/ethernet/mellanox/mlx4/en_rx.c:119:30: warning: array subscript i is outside array bounds of ‘struct mlx4_wqe_data_seg[0]’ [-Warray-bounds=] This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. Link: https://github.com/KSPP/linux/issues/21 Link: https://github.com/KSPP/linux/issues/264 Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] Signed-off-by:
Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by:
Tariq Toukan <tariqt@nvidia.com> Signed-off-by:
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David S. Miller authored
Heiner Kallweit says: ==================== r8169: disable ASPM during NAPI poll This is a rework of ideas from Kai-Heng on how to avoid the known ASPM issues whilst still allowing for a maximum of ASPM-related power savings. As a prerequisite some locking is added first. ==================== Signed-off-by: -
Heiner Kallweit authored
Now that ASPM is disabled during NAPI poll, we can remove all ASPM restrictions. This allows for higher power savings if the network isn't fully loaded. Reviewed-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Tested-by:
Holger Hoffstätte <holger@applied-asynchrony.com> Signed-off-by:
Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by:
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Heiner Kallweit authored
Several chip versions have problems with ASPM, what may result in rx_missed errors or tx timeouts. The root cause isn't known but experience shows that disabling ASPM during NAPI poll can avoid these problems. Suggested-by:
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Heiner Kallweit authored
Bail out if the function is used with chip versions that don't support ASPM configuration. In addition remove the delay, it tuned out that it's not needed, also vendor driver r8125 doesn't have it. Suggested-by:
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Heiner Kallweit authored
For disabling ASPM during NAPI poll we'll have to unlock access to the config registers in atomic context. Other code parts running with config register access unlocked are partially longer and can sleep. Add a usage counter to enable parallel execution of code parts requiring unlocked config registers. Reviewed-by:
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Heiner Kallweit authored
For disabling ASPM during NAPI poll we'll have to access both registers in atomic context. Use a spinlock to protect access. Reviewed-by:
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Heiner Kallweit authored
For disabling ASPM during NAPI poll we'll have to access mac ocp registers in atomic context. This could result in races because a mac ocp read consists of a write to register OCPDR, followed by a read from the same register. Therefore add a spinlock to protect access to mac ocp registers. Reviewed-by:
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Vadim Fedorenko authored
When the feature was added it was enabled for SW timestamps only but with current hardware the same out-of-order timestamps can be seen. Let's expand the area for the feature to all types of timestamps. Signed-off-by:
Vadim Fedorenko <vadfed@meta.com> Reviewed-by:
Willem de Bruijn <willemb@google.com> Signed-off-by:
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Gustavo A. R. Silva authored
Zero-length arrays as fake flexible arrays are deprecated and we are moving towards adopting C99 flexible-array members instead. Transform zero-length array into flexible-array member in struct nx_cardrsp_rx_ctx_t. Address the following warnings found with GCC-13 and -fstrict-flex-arrays=3 enabled: drivers/net/ethernet/qlogic/netxen/netxen_nic_ctx.c:361:26: warning: array subscript <unknown> is outside array bounds of ‘char[0]’ [-Warray-bounds=] drivers/net/ethernet/qlogic/netxen/netxen_nic_ctx.c:372:25: warning: array subscript <unknown> is outside array bounds of ‘char[0]’ [-Warray-bounds=] This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. Link: https://github.com/KSPP/linux/issues/21 Link: https://github.com/KSPP/linux/issues/265 Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] Signed-off-by:
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Heiner Kallweit authored
lan95xx_config_aneg_ext() can be simplified by using phy_set_bits(). Signed-off-by:
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Eric Dumazet authored
enum skb_drop_reason is more generic, we can adopt it instead. Provide dev_kfree_skb_irq_reason() and dev_kfree_skb_any_reason(). This means drivers can use more precise drop reasons if they want to. Signed-off-by:
Yunsheng Lin <linyunsheng@huawei.com> Link: https://lore.kernel.org/r/20230306204313.10492-1-edumazet@google.comSigned-off-by:
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Heiner Kallweit authored
cond sometimes is (val & MASK) what may result in a false positive if val is a negative errno. We shouldn't evaluate cond if val < 0. This has no functional impact here, but it's not nice. Therefore switch order of the checks. Signed-off-by:
Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/6d8274ac-4344-23b4-d9a3-cad4c39517d4@gmail.comSigned-off-by:
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- 07 Mar, 2023 11 commits
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Andrii Nakryiko authored
Puranjay Mohan says: ==================== This series add the support of the ARM architecture to libbpf USDT. This involves implementing the parse_usdt_arg() function for ARM. It was seen that the last part of parse_usdt_arg() is repeated for all architectures, so, the first patch in this series refactors these functions and moved the post processing to parse_usdt_spec() Changes in V2[1] to V3: - Use a tabular approach to find register offsets. - Add the patch for refactoring parse_usdt_arg() ==================== Signed-off-by: -
Puranjay Mohan authored
Parsing of USDT arguments is architecture-specific; on arm it is relatively easy since registers used are r[0-10], fp, ip, sp, lr, pc. Format is slightly different compared to aarch64; forms are - "size @ [ reg, #offset ]" for dereferences, for example "-8 @ [ sp, #76 ]" ; " -4 @ [ sp ]" - "size @ reg" for register values; for example "-4@r0" - "size @ #value" for raw values; for example "-8@#1" Add support for parsing USDT arguments for ARM architecture. To test the above changes QEMU's virt[1] board with cortex-a15 CPU was used. libbpf-bootstrap's usdt example[2] was modified to attach to a test program with DTRACE_PROBE1/2/3/4... probes to test different combinations. [1] https://www.qemu.org/docs/master/system/arm/virt.html [2] https://github.com/libbpf/libbpf-bootstrap/blob/master/examples/c/usdt.bpf.cSigned-off-by:
Puranjay Mohan <puranjay12@gmail.com> Signed-off-by:
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Puranjay Mohan authored
The parse_usdt_arg() function is defined differently for each architecture but the last part of the function is repeated verbatim for each architecture. Refactor parse_usdt_arg() to fill the arg_sz and then do the repeated post-processing in parse_usdt_spec(). Signed-off-by:
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Daniel Müller authored
Coverity reported a potential underflow of the offset variable used in the find_cd() function. Switch to using a signed 64 bit integer for the representation of offset to make sure we can never underflow. Fixes: 1eebcb60 ("libbpf: Implement basic zip archive parsing support") Signed-off-by:
Daniel Müller <deso@posteo.net> Signed-off-by:
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Alexei Starovoitov authored
Yafang Shao says: ==================== Currently we can't get bpf memory usage reliably either from memcg or from bpftool. In memcg, there's not a 'bpf' item in memory.stat, but only 'kernel', 'sock', 'vmalloc' and 'percpu' which may related to bpf memory. With these items we still can't get the bpf memory usage, because bpf memory usage may far less than the kmem in a memcg, for example, the dentry may consume lots of kmem. bpftool now shows the bpf memory footprint, which is difference with bpf memory usage. The difference can be quite great in some cases, for example, - non-preallocated bpf map The non-preallocated bpf map memory usage is dynamically changed. The allocated elements count can be from 0 to the max entries. But the memory footprint in bpftool only shows a fixed number. - bpf metadata consumes more memory than bpf element In some corner cases, the bpf metadata can consumes a lot more memory than bpf element consumes. For example, it can happen when the element size is quite small. - some maps don't have key, value or max_entries For example the key_size and value_size of ringbuf is 0, so its memlock is always 0. We need a way to show the bpf memory usage especially there will be more and more bpf programs running on the production environment and thus the bpf memory usage is not trivial. This patchset introduces a new map ops ->map_mem_usage to calculate the memory usage. Note that we don't intend to make the memory usage 100% accurate, while our goal is to make sure there is only a small difference between what bpftool reports and the real memory. That small difference can be ignored compared to the total usage. That is enough to monitor the bpf memory usage. For example, the user can rely on this value to monitor the trend of bpf memory usage, compare the difference in bpf memory usage between different bpf program versions, figure out which maps consume large memory, and etc. This patchset implements the bpf memory usage for all maps, and yet there's still work to do. We don't want to introduce runtime overhead in the element update and delete path, but we have to do it for some non-preallocated maps, - devmap, xskmap When we update or delete an element, it will allocate or free memory. In order to track this dynamic memory, we have to track the count in element update and delete path. - cpumap The element size of each cpumap element is not determinated. If we want to track the usage, we have to count the size of all elements in the element update and delete path. So I just put it aside currently. - local_storage, bpf_local_storage When we attach or detach a cgroup, it will allocate or free memory. If we want to track the dynamic memory, we also need to do something in the update and delete path. So I just put it aside currently. - offload map The element update and delete of offload map is via the netdev dev_ops, in which it may dynamically allocate or free memory, but this dynamic memory isn't counted in offload map memory usage currently. The result of each map can be found in the individual patch. We may also need to track per-container bpf memory usage, that will be addressed by a different patchset. Changes: v3->v4: code improvement on ringbuf (Andrii) use READ_ONCE() to read lpm_trie (Tao) explain why we can't get bpf memory usage from memcg. v2->v3: check callback at map creation time and avoid warning (Alexei) fix build error under CONFIG_BPF=n (lkp@intel.com) v1->v2: calculate the memory usage within bpf (Alexei) - [v1] bpf, mm: bpf memory usage https://lwn.net/Articles/921991/ - [RFC PATCH v2] mm, bpf: Add BPF into /proc/meminfo https://lwn.net/Articles/919848/ - [RFC PATCH v1] mm, bpf: Add BPF into /proc/meminfo https://lwn.net/Articles/917647/ - [RFC PATCH] bpf, mm: Add a new item bpf into memory.stat https://lore.kernel.org/bpf/20220921170002.29557-1-laoar.shao@gmail].com/ ==================== Signed-off-by:Alexei Starovoitov <ast@kernel.org>
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Yafang Shao authored
We have implemented memory usage callback for all maps, and we enforce any newly added map having a callback as well. We check this callback at map creation time. If it doesn't have the callback, we will return EINVAL. Signed-off-by:
Yafang Shao <laoar.shao@gmail.com> Link: https://lore.kernel.org/r/20230305124615.12358-19-laoar.shao@gmail.comSigned-off-by:
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Yafang Shao authored
A new helper is introduced to calculate offload map memory usage. But currently the memory dynamically allocated in netdev dev_ops, like nsim_map_update_elem, is not counted. Let's just put it aside now. Signed-off-by:
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Yafang Shao authored
A new helper is introduced to calculate xskmap memory usage. The xfsmap memory usage can be dynamically changed when we add or remove a xsk_map_node. Hence we need to track the count of xsk_map_node to get its memory usage. The result as follows, - before 10: xskmap name count_map flags 0x0 key 4B value 4B max_entries 65536 memlock 524288B - after 10: xskmap name count_map flags 0x0 <<< no elements case key 4B value 4B max_entries 65536 memlock 524608B Signed-off-by: -
Yafang Shao authored
sockmap and sockhash don't have something in common in allocation, so let's introduce different helpers to calculate their memory usage. The reuslt as follows, - before 28: sockmap name count_map flags 0x0 key 4B value 4B max_entries 65536 memlock 524288B 29: sockhash name count_map flags 0x0 key 4B value 4B max_entries 65536 memlock 524288B - after 28: sockmap name count_map flags 0x0 key 4B value 4B max_entries 65536 memlock 524608B 29: sockhash name count_map flags 0x0 <<<< no updated elements key 4B value 4B max_entries 65536 memlock 1048896B Signed-off-by: -
Yafang Shao authored
A new helper is introduced into bpf_local_storage map to calculate the memory usage. This helper is also used by other maps like bpf_cgrp_storage, bpf_inode_storage, bpf_task_storage and etc. Note that currently the dynamically allocated storage elements are not counted in the usage, since it will take extra runtime overhead in the elements update or delete path. So let's put it aside now, and implement it in the future when someone really need it. Signed-off-by:
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Yafang Shao authored
A new helper is introduced to calculate local_storage map memory usage. Currently the dynamically allocated elements are not counted, since it will take runtime overhead in the element update or delete path. So let's put it aside currently, and implement it in the future if the user really needs it. Signed-off-by:
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