- 24 Jan, 2022 3 commits
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Daniel Borkmann authored
Revert commit 54435652 ("selftests/bpf: switch to new libbpf XDP APIs") for now given this will heavily conflict with 4b27480d ("bpf/selftests: convert xdp_link test to ASSERT_* macros") upon merge. Andrii agreed to redo the conversion cleanly after trees merged. Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Andrii Nakryiko <andrii@kernel.org>
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Magnus Karlsson authored
Fix the rx_full stats test so that it correctly reports pass even when the fill ring is not full of buffers. Fixes: 872a1184 ("selftests: xsk: Put the same buffer only once in the fill ring") Signed-off-by:
Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by:
Maciej Fijalkowski <maciej.fijalkowski@intel.com> Acked-by:
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kernel test robot authored
Zero-length and one-element arrays are deprecated, see: Documentation/process/deprecated.rst Flexible-array members should be used instead. Generated by: scripts/coccinelle/misc/flexible_array.cocci Fixes: c1ff181f ("selftests/bpf: Extend kfunc selftests") Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
Julia Lawall <julia.lawall@inria.fr> Signed-off-by:
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- 21 Jan, 2022 36 commits
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Alexei Starovoitov authored
Lorenzo Bianconi says: ==================== This series introduces XDP frags support. The mvneta driver is the first to support these new "non-linear" xdp_{buff,frame}. Reviewers please focus on how these new types of xdp_{buff,frame} packets traverse the different layers and the layout design. It is on purpose that BPF-helpers are kept simple, as we don't want to expose the internal layout to allow later changes. The main idea for the new XDP frags layout is to reuse the same structure used for non-linear SKB. This rely on the "skb_shared_info" struct at the end of the first buffer to link together subsequent buffers. Keeping the layout compatible with SKBs is also done to ease and speedup creating a SKB from an xdp_{buff,frame}. Converting xdp_frame to SKB and deliver it to the network stack is shown in patch 05/18 (e.g. cpumaps). A frags bit (XDP_FLAGS_HAS_FRAGS) has been introduced in the flags field of xdp_{buff,frame} structure to notify the bpf/network layer if this is a non-linear xdp frame (XDP_FLAGS_HAS_FRAGS set) or not (XDP_FLAGS_HAS_FRAGS not set). The frags bit will be set by a xdp frags capable driver only for non-linear frames maintaining the capability to receive linear frames without any extra cost since the skb_shared_info structure at the end of the first buffer will be initialized only if XDP_FLAGS_HAS_FRAGS bit is set. Moreover the flags field in xdp_{buff,frame} will be reused even for xdp rx csum offloading in future series. Typical use cases for this series are: - Jumbo-frames - Packet header split (please see Google’s use-case @ NetDevConf 0x14, [0]) - TSO/GRO for XDP_REDIRECT The three following ebpf helpers (and related selftests) has been introduced: - bpf_xdp_load_bytes: This helper is provided as an easy way to load data from a xdp buffer. It can be used to load len bytes from offset from the frame associated to xdp_md, into the buffer pointed by buf. - bpf_xdp_store_bytes: Store len bytes from buffer buf into the frame associated to xdp_md, at offset. - bpf_xdp_get_buff_len: Return the total frame size (linear + paged parts) bpf_xdp_adjust_tail and bpf_xdp_copy helpers have been modified to take into account non-linear xdp frames. Moreover, similar to skb_header_pointer, we introduced bpf_xdp_pointer utility routine to return a pointer to a given position in the xdp_buff if the requested area (offset + len) is contained in a contiguous memory area otherwise it must be copied in a bounce buffer provided by the caller running bpf_xdp_copy_buf(). BPF_F_XDP_HAS_FRAGS flag has been introduced to notify the kernel the eBPF program fully support xdp frags. SEC("xdp.frags"), SEC_DEF("xdp.frags/devmap") and SEC_DEF("xdp.frags/cpumap") have been introduced to declare xdp frags support. The NIC driver is expected to reject an eBPF program if it is running in XDP frags mode and the program does not support XDP frags. In the same way it is not possible to mix XDP frags and XDP legacy programs in a CPUMAP/DEVMAP or tailcall a XDP frags/legacy program from a legacy/frags one. More info about the main idea behind this approach can be found here [1][2]. Changes since v22: - remove leftover CHECK macro usage - reintroduce SEC_XDP_FRAGS flag in sec_def_flags - rename xdp multi_frags in xdp frags - do not report xdp_frags support in fdinfo Changes since v21: - rename *_mb in *_frags: e.g: s/xdp_buff_is_mb/xdp_buff_has_frags - rely on ASSERT_* and not on CHECK in bpf_xdp_load_bytes/bpf_xdp_store_bytes self-tests - change new multi.frags SEC definitions to use the following schema: prog_type.prog_flags/attach_place - get rid of unnecessary properties in new multi.frags SEC definitions - rebase on top of bpf-next Changes since v20: - rebase to current bpf-next Changes since v19: - do not run deprecated bpf_prog_load() - rely on skb_frag_size_add/skb_frag_size_sub in bpf_xdp_mb_increase_tail/bpf_xdp_mb_shrink_tail - rely on sinfo->nr_frags in bpf_xdp_mb_shrink_tail to check if the frame has been shrunk to a single-buffer one - allow XDP_REDIRECT of a xdp-mb frame into a CPUMAP Changes since v18: - fix bpf_xdp_copy_buf utility routine when we want to load/store data contained in frag<n> - add a selftest for bpf_xdp_load_bytes/bpf_xdp_store_bytes when the caller accesses data contained in frag<n> and frag<n+1> Changes since v17: - rework bpf_xdp_copy to squash base and frag management - remove unused variable in bpf_xdp_mb_shrink_tail() - move bpf_xdp_copy_buf() out of bpf_xdp_pointer() - add sanity check for len in bpf_xdp_pointer() - remove EXPORT_SYMBOL for __xdp_return() - introduce frag_size field in xdp_rxq_info to let the driver specify max value for xdp fragments. frag_size set to 0 means the tail increase of last the fragment is not supported. Changes since v16: - do not allow tailcalling a xdp multi-buffer/legacy program from a legacy/multi-buff one. - do not allow mixing xdp multi-buffer and xdp legacy programs in a CPUMAP/DEVMAP - add selftests for CPUMAP/DEVMAP xdp mb compatibility - disable XDP_REDIRECT for xdp multi-buff for the moment - set max offset value to 0xffff in bpf_xdp_pointer - use ARG_PTR_TO_UNINIT_MEM and ARG_CONST_SIZE for arg3_type and arg4_type of bpf_xdp_store_bytes/bpf_xdp_load_bytes Changes since v15: - let the verifier check buf is not NULL in bpf_xdp_load_bytes/bpf_xdp_store_bytes helpers - return an error if offset + length is over frame boundaries in bpf_xdp_pointer routine - introduce BPF_F_XDP_MB flag for bpf_attr to notify the kernel the eBPF program fully supports xdp multi-buffer. - reject a non XDP multi-buffer program if the driver is running in XDP multi-buffer mode. Changes since v14: - intrudce bpf_xdp_pointer utility routine and bpf_xdp_load_bytes/bpf_xdp_store_bytes helpers - drop bpf_xdp_adjust_data helper - drop xdp_frags_truesize in skb_shared_info - explode bpf_xdp_mb_adjust_tail in bpf_xdp_mb_increase_tail and bpf_xdp_mb_shrink_tail Changes since v13: - use u32 for xdp_buff/xdp_frame flags field - rename xdp_frags_tsize in xdp_frags_truesize - fixed comments Changes since v12: - fix bpf_xdp_adjust_data helper for single-buffer use case - return -EFAULT in bpf_xdp_adjust_{head,tail} in case the data pointers are not properly reset - collect ACKs from John Changes since v11: - add missing static to bpf_xdp_get_buff_len_proto structure - fix bpf_xdp_adjust_data helper when offset is smaller than linear area length. Changes since v10: - move xdp->data to the requested payload offset instead of to the beginning of the fragment in bpf_xdp_adjust_data() Changes since v9: - introduce bpf_xdp_adjust_data helper and related selftest - add xdp_frags_size and xdp_frags_tsize fields in skb_shared_info - introduce xdp_update_skb_shared_info utility routine in ordere to not reset frags array in skb_shared_info converting from a xdp_buff/xdp_frame to a skb - simplify bpf_xdp_copy routine Changes since v8: - add proper dma unmapping if XDP_TX fails on mvneta for a xdp multi-buff - switch back to skb_shared_info implementation from previous xdp_shared_info one - avoid using a bietfield in xdp_buff/xdp_frame since it introduces performance regressions. Tested now on 10G NIC (ixgbe) to verify there are no performance penalties for regular codebase - add bpf_xdp_get_buff_len helper and remove frame_length field in xdp ctx - add data_len field in skb_shared_info struct - introduce XDP_FLAGS_FRAGS_PF_MEMALLOC flag Changes since v7: - rebase on top of bpf-next - fix sparse warnings - improve comments for frame_length in include/net/xdp.h Changes since v6: - the main difference respect to previous versions is the new approach proposed by Eelco to pass full length of the packet to eBPF layer in XDP context - reintroduce multi-buff support to eBPF kself-tests - reintroduce multi-buff support to bpf_xdp_adjust_tail helper - introduce multi-buffer support to bpf_xdp_copy helper - rebase on top of bpf-next Changes since v5: - rebase on top of bpf-next - initialize mb bit in xdp_init_buff() and drop per-driver initialization - drop xdp->mb initialization in xdp_convert_zc_to_xdp_frame() - postpone introduction of frame_length field in XDP ctx to another series - minor changes Changes since v4: - rebase ontop of bpf-next - introduce xdp_shared_info to build xdp multi-buff instead of using the skb_shared_info struct - introduce frame_length in xdp ctx - drop previous bpf helpers - fix bpf_xdp_adjust_tail for xdp multi-buff - introduce xdp multi-buff self-tests for bpf_xdp_adjust_tail - fix xdp_return_frame_bulk for xdp multi-buff Changes since v3: - rebase ontop of bpf-next - add patch 10/13 to copy back paged data from a xdp multi-buff frame to userspace buffer for xdp multi-buff selftests Changes since v2: - add throughput measurements - drop bpf_xdp_adjust_mb_header bpf helper - introduce selftest for xdp multibuffer - addressed comments on bpf_xdp_get_frags_count - introduce xdp multi-buff support to cpumaps Changes since v1: - Fix use-after-free in xdp_return_{buff/frame} - Introduce bpf helpers - Introduce xdp_mb sample program - access skb_shared_info->nr_frags only on the last fragment Changes since RFC: - squash multi-buffer bit initialization in a single patch - add mvneta non-linear XDP buff support for tx side [0] https://netdevconf.info/0x14/session.html?talk-the-path-to-tcp-4k-mtu-and-rx-zerocopy [1] https://github.com/xdp-project/xdp-project/blob/master/areas/core/xdp-multi-buffer01-design.org [2] https://netdevconf.info/0x14/session.html?tutorial-add-XDP-support-to-a-NIC-driver (XDPmulti-buffers section) Eelco Chaudron (3): bpf: add frags support to the bpf_xdp_adjust_tail() API bpf: add frags support to xdp copy helpers bpf: selftests: update xdp_adjust_tail selftest to include xdp frags Lorenzo Bianconi (19): net: skbuff: add size metadata to skb_shared_info for xdp xdp: introduce flags field in xdp_buff/xdp_frame net: mvneta: update frags bit before passing the xdp buffer to eBPF layer net: mvneta: simplify mvneta_swbm_add_rx_fragment management net: xdp: add xdp_update_skb_shared_info utility routine net: marvell: rely on xdp_update_skb_shared_info utility routine xdp: add frags support to xdp_return_{buff/frame} net: mvneta: add frags support to XDP_TX bpf: introduce BPF_F_XDP_HAS_FRAGS flag in prog_flags loading the ebpf program net: mvneta: enable jumbo frames if the loaded XDP program support frags bpf: introduce bpf_xdp_get_buff_len helper bpf: move user_size out of bpf_test_init bpf: introduce frags support to bpf_prog_test_run_xdp() bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature libbpf: Add SEC name for xdp frags programs net: xdp: introduce bpf_xdp_pointer utility routine bpf: selftests: introduce bpf_xdp_{load,store}_bytes selftest bpf: selftests: add CPUMAP/DEVMAP selftests for xdp frags xdp: disable XDP_REDIRECT for xdp frags ==================== Signed-off-by: -
Lorenzo Bianconi authored
XDP_REDIRECT is not fully supported yet for xdp frags since not all XDP capable drivers can map non-linear xdp_frame in ndo_xdp_xmit so disable it for the moment. Acked-by:
Toke Hoiland-Jorgensen <toke@redhat.com> Acked-by:
John Fastabend <john.fastabend@gmail.com> Acked-by:
Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/0da25e117d0e2673f5d0ce6503393c55c6fb1be9.1642758637.git.lorenzo@kernel.orgSigned-off-by:
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Lorenzo Bianconi authored
Verify compatibility checks attaching a XDP frags program to a CPUMAP/DEVMAP Acked-by:
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Lorenzo Bianconi authored
Introduce kernel selftest for new bpf_xdp_{load,store}_bytes helpers. and bpf_xdp_pointer/bpf_xdp_copy_buf utility routines. Acked-by: -
Lorenzo Bianconi authored
Similar to skb_header_pointer, introduce bpf_xdp_pointer utility routine to return a pointer to a given position in the xdp_buff if the requested area (offset + len) is contained in a contiguous memory area otherwise it will be copied in a bounce buffer provided by the caller. Similar to the tc counterpart, introduce the two following xdp helpers: - bpf_xdp_load_bytes - bpf_xdp_store_bytes Reviewed-by:
Eelco Chaudron <echaudro@redhat.com> Acked-by:
Jakub Kicinski <kuba@kernel.org> Signed-off-by:
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Toke Hoiland-Jorgensen authored
The check for tail call map compatibility ensures that tail calls only happen between maps of the same type. To ensure backwards compatibility for XDP frags we need a similar type of check for cpumap and devmap programs, so move the state from bpf_array_aux into bpf_map, add xdp_has_frags to the check, and apply the same check to cpumap and devmap. Acked-by:
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Lorenzo Bianconi authored
Introduce support for the following SEC entries for XDP frags property: - SEC("xdp.frags") - SEC("xdp.frags/devmap") - SEC("xdp.frags/cpumap") Acked-by: -
Eelco Chaudron authored
This change adds test cases for the xdp frags scenarios when shrinking and growing. Acked-by:
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Lorenzo Bianconi authored
introduce xdp_shared_info pointer in bpf_test_finish signature in order to copy back paged data from a xdp frags frame to userspace buffer Acked-by:
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Lorenzo Bianconi authored
Introduce the capability to allocate a xdp frags in bpf_prog_test_run_xdp routine. This is a preliminary patch to introduce the selftests for new xdp frags ebpf helpers Acked-by:
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Lorenzo Bianconi authored
Rely on data_size_in in bpf_test_init routine signature. This is a preliminary patch to introduce xdp frags selftest Acked-by:
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Eelco Chaudron authored
This patch adds support for frags for the following helpers: - bpf_xdp_output() - bpf_perf_event_output() Acked-by:
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Eelco Chaudron authored
This change adds support for tail growing and shrinking for XDP frags. When called on a non-linear packet with a grow request, it will work on the last fragment of the packet. So the maximum grow size is the last fragments tailroom, i.e. no new buffer will be allocated. A XDP frags capable driver is expected to set frag_size in xdp_rxq_info data structure to notify the XDP core the fragment size. frag_size set to 0 is interpreted by the XDP core as tail growing is not allowed. Introduce __xdp_rxq_info_reg utility routine to initialize frag_size field. When shrinking, it will work from the last fragment, all the way down to the base buffer depending on the shrinking size. It's important to mention that once you shrink down the fragment(s) are freed, so you can not grow again to the original size. Acked-by:
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Lorenzo Bianconi authored
Introduce bpf_xdp_get_buff_len helper in order to return the xdp buffer total size (linear and paged area) Acked-by:
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Lorenzo Bianconi authored
Enable the capability to receive jumbo frames even if the interface is running in XDP mode if the loaded program declare to properly support xdp frags. At same time reject a xdp program not supporting xdp frags if the driver is running in xdp frags mode. Acked-by:
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Lorenzo Bianconi authored
Introduce BPF_F_XDP_HAS_FRAGS and the related field in bpf_prog_aux in order to notify the driver the loaded program support xdp frags. Acked-by:
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Lorenzo Bianconi authored
Introduce the capability to map non-linear xdp buffer running mvneta_xdp_submit_frame() for XDP_TX and XDP_REDIRECT Acked-by:
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Lorenzo Bianconi authored
Take into account if the received xdp_buff/xdp_frame is non-linear recycling/returning the frame memory to the allocator or into xdp_frame_bulk. Acked-by:
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Lorenzo Bianconi authored
Rely on xdp_update_skb_shared_info routine in order to avoid resetting frags array in skb_shared_info structure building the skb in mvneta_swbm_build_skb(). Frags array is expected to be initialized by the receiving driver building the xdp_buff and here we just need to update memory metadata. Acked-by:
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Lorenzo Bianconi authored
Introduce xdp_update_skb_shared_info routine to update frags array metadata in skb_shared_info data structure converting to a skb from a xdp_buff or xdp_frame. According to the current skb_shared_info architecture in xdp_frame/xdp_buff and to the xdp frags support, there is no need to run skb_add_rx_frag() and reset frags array converting the buffer to a skb since the frag array will be in the same position for xdp_buff/xdp_frame and for the skb, we just need to update memory metadata. Introduce XDP_FLAGS_PF_MEMALLOC flag in xdp_buff_flags in order to mark the xdp_buff or xdp_frame as under memory-pressure if pages of the frags array are under memory pressure. Doing so we can avoid looping over all fragments in xdp_update_skb_shared_info routine. The driver is expected to set the flag constructing the xdp_buffer using xdp_buff_set_frag_pfmemalloc utility routine. Rely on xdp_update_skb_shared_info in __xdp_build_skb_from_frame routine converting the non-linear xdp_frame to a skb after performing a XDP_REDIRECT. Acked-by:
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Lorenzo Bianconi authored
Relying on xdp frags bit, remove skb_shared_info structure allocated on the stack in mvneta_rx_swbm routine and simplify mvneta_swbm_add_rx_fragment accessing skb_shared_info in the xdp_buff structure directly. There is no performance penalty in this approach since mvneta_swbm_add_rx_fragment is run just for xdp frags use-case. Acked-by:
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Lorenzo Bianconi authored
Update frags bit (XDP_FLAGS_HAS_FRAGS) in xdp_buff to notify XDP/eBPF layer and XDP remote drivers if this is a "non-linear" XDP buffer. Access skb_shared_info only if XDP_FLAGS_HAS_FRAGS flag is set in order to avoid possible cache-misses. Acked-by:
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Lorenzo Bianconi authored
Introduce flags field in xdp_frame and xdp_buffer data structures to define additional buffer features. At the moment the only supported buffer feature is frags bit (XDP_FLAGS_HAS_FRAGS). frags bit is used to specify if this is a linear buffer (XDP_FLAGS_HAS_FRAGS not set) or a frags frame (XDP_FLAGS_HAS_FRAGS set). In the latter case the driver is expected to initialize the skb_shared_info structure at the end of the first buffer to link together subsequent buffers belonging to the same frame. Acked-by:
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Lorenzo Bianconi authored
Introduce xdp_frags_size field in skb_shared_info data structure to store xdp_buff/xdp_frame frame paged size (xdp_frags_size will be used in xdp frags support). In order to not increase skb_shared_info size we will use a hole due to skb_shared_info alignment. Acked-by:
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Di Zhu authored
Add test for querying progs attached to sockmap. we use an existing libbpf query interface to query prog cnt before and after progs attaching to sockmap and check whether the queried prog id is right. Signed-off-by:
Di Zhu <zhudi2@huawei.com> Acked-by:
Yonghong Song <yhs@fb.com> Reviewed-by:
Jakub Sitnicki <jakub@cloudflare.com> Link: https://lore.kernel.org/r/20220119014005.1209-2-zhudi2@huawei.comSigned-off-by:
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Di Zhu authored
Right now there is no way to query whether BPF programs are attached to a sockmap or not. we can use the standard interface in libbpf to query, such as: bpf_prog_query(mapFd, BPF_SK_SKB_STREAM_PARSER, 0, NULL, ...); the mapFd is the fd of sockmap. Signed-off-by:
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Alexei Starovoitov authored
Andrii Nakryiko says: ==================== Revamp existing low-level XDP APIs provided by libbpf to follow more consistent naming (new APIs follow bpf_tc_xxx() approach where it makes sense) and be extensible without ABI breakages (OPTS-based). See patch #1 for details, remaining patches switch bpftool, selftests/bpf and samples/bpf to new APIs. ==================== Signed-off-by: -
Andrii Nakryiko authored
Use new bpf_xdp_*() APIs across all XDP-related BPF samples. Signed-off-by:
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Andrii Nakryiko authored
Switch to using new bpf_xdp_*() APIs across all selftests. Take advantage of a more straightforward and user-friendly semantics of old_prog_fd (0 means "don't care") in few places. Signed-off-by:
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Andrii Nakryiko authored
Switch to new bpf_xdp_attach() API to avoid deprecation warnings. Signed-off-by:
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Andrii Nakryiko authored
Introduce 4 new netlink-based XDP APIs for attaching, detaching, and querying XDP programs: - bpf_xdp_attach; - bpf_xdp_detach; - bpf_xdp_query; - bpf_xdp_query_id. These APIs replace bpf_set_link_xdp_fd, bpf_set_link_xdp_fd_opts, bpf_get_link_xdp_id, and bpf_get_link_xdp_info APIs ([0]). The latter don't follow a consistent naming pattern and some of them use non-extensible approaches (e.g., struct xdp_link_info which can't be modified without breaking libbpf ABI). The approach I took with these low-level XDP APIs is similar to what we did with low-level TC APIs. There is a nice duality of bpf_tc_attach vs bpf_xdp_attach, and so on. I left bpf_xdp_attach() to support detaching when -1 is specified for prog_fd for generality and convenience, but bpf_xdp_detach() is preferred due to clearer naming and associated semantics. Both bpf_xdp_attach() and bpf_xdp_detach() accept the same opts struct allowing to specify expected old_prog_fd. While doing the refactoring, I noticed that old APIs require users to specify opts with old_fd == -1 to declare "don't care about already attached XDP prog fd" condition. Otherwise, FD 0 is assumed, which is essentially never an intended behavior. So I made this behavior consistent with other kernel and libbpf APIs, in which zero FD means "no FD". This seems to be more in line with the latest thinking in BPF land and should cause less user confusion, hopefully. For querying, I left two APIs, both more generic bpf_xdp_query() allowing to query multiple IDs and attach mode, but also a specialization of it, bpf_xdp_query_id(), which returns only requested prog_id. Uses of prog_id returning bpf_get_link_xdp_id() were so prevalent across selftests and samples, that it seemed a very common use case and using bpf_xdp_query() for doing it felt very cumbersome with a highly branches if/else chain based on flags and attach mode. Old APIs are scheduled for deprecation in libbpf 0.8 release. [0] Closes: https://github.com/libbpf/libbpf/issues/309Signed-off-by:
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Alexei Starovoitov authored
Andrii Nakryiko says: ==================== Officially deprecate legacy BPF map definitions in libbpf. They've been slated for deprecation for a while in favor of more powerful BTF-defined map definitions and this patch set adds warnings and a way to enforce this in libbpf through LIBBPF_STRICT_MAP_DEFINITIONS strict mode flag. Selftests are fixed up and updated, BPF documentation is updated, bpftool's strict mode usage is adjusted to avoid breaking users unnecessarily. v1->v2: - replace missed bpf_map_def case in Documentation/bpf/btf.rst (Alexei). ==================== Signed-off-by: -
Andrii Nakryiko authored
Use BTF-defined map definition in the documentation example. Signed-off-by:
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Andrii Nakryiko authored
Enact deprecation of legacy BPF map definition in SEC("maps") ([0]). For the definitions themselves introduce LIBBPF_STRICT_MAP_DEFINITIONS flag for libbpf strict mode. If it is set, error out on any struct bpf_map_def-based map definition. If not set, libbpf will print out a warning for each legacy BPF map to raise awareness that it goes away. For any use of BPF_ANNOTATE_KV_PAIR() macro providing a legacy way to associate BTF key/value type information with legacy BPF map definition, warn through libbpf's pr_warn() error message (but don't fail BPF object open). BPF-side struct bpf_map_def is marked as deprecated. User-space struct bpf_map_def has to be used internally in libbpf, so it is left untouched. It should be enough for bpf_map__def() to be marked deprecated to raise awareness that it goes away. bpftool is an interesting case that utilizes libbpf to open BPF ELF object to generate skeleton. As such, even though bpftool itself uses full on strict libbpf mode (LIBBPF_STRICT_ALL), it has to relax it a bit for BPF map definition handling to minimize unnecessary disruptions. So opt-out of LIBBPF_STRICT_MAP_DEFINITIONS for bpftool. User's code that will later use generated skeleton will make its own decision whether to enforce LIBBPF_STRICT_MAP_DEFINITIONS or not. There are few tests in selftests/bpf that are consciously using legacy BPF map definitions to test libbpf functionality. For those, temporary opt out of LIBBPF_STRICT_MAP_DEFINITIONS mode for the duration of those tests. [0] Closes: https://github.com/libbpf/libbpf/issues/272Signed-off-by: -
Andrii Nakryiko authored
Converted few remaining legacy BPF map definition to BTF-defined ones. For the remaining two bpf_map_def-based legacy definitions that we want to keep for testing purposes until libbpf 1.0 release, guard them in pragma to suppres deprecation warnings which will be added in libbpf in the next commit. Signed-off-by:
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Andrii Nakryiko authored
It's very easy to miss compilation warnings without -Werror, which is not set for selftests. libbpf and bpftool are already strict about this, so make selftests/bpf also treat compilation warnings as errors to catch such regressions early. Signed-off-by:
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- 20 Jan, 2022 1 commit
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Kumar Kartikeya Dwivedi authored
Some users have complained that selftests fail to build when CONFIG_NF_CONNTRACK=m. It would be useful to allow building as long as it is set to module or built-in, even though in case of building as module, user would need to load it before running the selftest. Note that this also allows building selftest when CONFIG_NF_CONNTRACK is disabled. Signed-off-by:
Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by:
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