This patchset adds support for passing an xdp_md via ctx_in/ctx_out in bpf_attr for BPF_PROG_TEST_RUN of XDP programs. Patch 1 adds a function to validate XDP meta data lengths. Patch 2 adds initial support for passing XDP meta data in addition to packet data. Patch 3 adds support for also specifying the ingress interface and rx queue. Patch 4 adds selftests to ensure functionality is correct. Changelog: ---------- v7->v8 v7: https://lore.kernel.org/bpf/20210624211304.90807-1-zeffron@xxxxxxxxxxxxx/ * Fix too long comment line in patch 3 v6->v7 v6: https://lore.kernel.org/bpf/20210617232904.1899-1-zeffron@xxxxxxxxxxxxx/ * Add Yonghong Song's Acked-by to commit message in patch 1 * Add Yonghong Song's Acked-by to commit message in patch 2 * Extracted the post-update of the xdp_md context into a function (again) * Validate that the rx queue was registered with XDP info * Decrement the reference count on a found netdevice on failure to find a valid rx queue * Decrement the reference count on a found netdevice after the XDP program is run * Drop Yonghong Song's Acked-By for patch 3 because of patch changes * Improve a comment in the selftests * Drop Yonghong Song's Acked-By for patch 4 because of patch changes v5->v6 v5: https://lore.kernel.org/bpf/20210616224712.3243-1-zeffron@xxxxxxxxxxxxx/ * Correct commit messages in patches 1 and 3 * Add Acked-by to commit message in patch 4 * Use gotos instead of returns to correctly free resources in bpf_prog_test_run_xdp * Rename xdp_metalen_valid to xdp_metalen_invalid * Improve the function signature for xdp_metalen_invalid * Merged declaration of ingress_ifindex and rx_queue_index into one line v4->v5 v4: https://lore.kernel.org/bpf/20210604220235.6758-1-zeffron@xxxxxxxxxxxxx/ * Add new patch to introduce xdp_metalen_valid inline function to avoid duplicated code from net/core/filter.c * Correct size of bad_ctx in selftests * Make all declarations reverse Christmas tree * Move data check from xdp_convert_md_to_buff to bpf_prog_test_run_xdp * Merge xdp_convert_buff_to_md into bpf_prog_test_run_xdp * Fix line too long * Extracted common checks in selftests to a helper function * Removed redundant assignment in selftests * Reordered test cases in selftests * Check data against 0 instead of data_meta in selftests * Made selftests use EINVAL instead of hardcoded 22 * Dropped "_" from XDP function name * Changed casts in XDP program from unsigned long to long * Added a comment explaining the use of the loopback interface in selftests * Change parameter order in xdp_convert_md_to_buff to be input first * Assigned xdp->ingress_ifindex and xdp->rx_queue_index to local variables in xdp_convert_md_to_buff * Made use of "meta data" versus "metadata" consistent in comments and commit messages v3->v4 v3: https://lore.kernel.org/bpf/20210602190815.8096-1-zeffron@xxxxxxxxxxxxx/ * Clean up nits * Validate xdp_md->data_end in bpf_prog_test_run_xdp * Remove intermediate metalen variables v2 -> v3 v2: https://lore.kernel.org/bpf/20210527201341.7128-1-zeffron@xxxxxxxxxxxxx/ * Check errno first in selftests * Use DECLARE_LIBBPF_OPTS * Rename tattr to opts in selftests * Remove extra new line * Rename convert_xdpmd_to_xdpb to xdp_convert_md_to_buff * Rename convert_xdpb_to_xdpmd to xdp_convert_buff_to_md * Move declaration of device and rxqueue in xdp_convert_md_to_buff to patch 2 * Reorder the kfree calls in bpf_prog_test_run_xdp v1 -> v2 v1: https://lore.kernel.org/bpf/20210524220555.251473-1-zeffron@xxxxxxxxxxxxx * Fix null pointer dereference with no context * Use the BPF skeleton and replace CHECK with ASSERT macros Zvi Effron (4): bpf: add function for XDP meta data length check bpf: support input xdp_md context in BPF_PROG_TEST_RUN bpf: support specifying ingress via xdp_md context in BPF_PROG_TEST_RUN selftests/bpf: Add test for xdp_md context in BPF_PROG_TEST_RUN include/net/xdp.h | 5 + include/uapi/linux/bpf.h | 3 - net/bpf/test_run.c | 109 ++++++++++++++++-- net/core/filter.c | 4 +- .../bpf/prog_tests/xdp_context_test_run.c | 105 +++++++++++++++++ .../bpf/progs/test_xdp_context_test_run.c | 20 ++++ 6 files changed, 233 insertions(+), 13 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c base-commit: 5e437416ff66981d8154687cfdf7de50b1d82bfc -- 2.31.1
