bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature
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: Toke Hoiland-Jorgensen <toke@redhat.com> Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/c803673798c786f915bcdd6c9338edaa9740d3d6.1642758637.git.lorenzo@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Родитель
1c19499825
Коммит
7855e0db15
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@ -131,7 +131,8 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
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static int bpf_test_finish(const union bpf_attr *kattr,
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union bpf_attr __user *uattr, const void *data,
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u32 size, u32 retval, u32 duration)
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struct skb_shared_info *sinfo, u32 size,
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u32 retval, u32 duration)
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{
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void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
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int err = -EFAULT;
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@ -146,8 +147,36 @@ static int bpf_test_finish(const union bpf_attr *kattr,
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err = -ENOSPC;
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}
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if (data_out && copy_to_user(data_out, data, copy_size))
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goto out;
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if (data_out) {
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int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size;
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if (copy_to_user(data_out, data, len))
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goto out;
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if (sinfo) {
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int i, offset = len, data_len;
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for (i = 0; i < sinfo->nr_frags; i++) {
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skb_frag_t *frag = &sinfo->frags[i];
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if (offset >= copy_size) {
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err = -ENOSPC;
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break;
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}
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data_len = min_t(int, copy_size - offset,
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skb_frag_size(frag));
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if (copy_to_user(data_out + offset,
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skb_frag_address(frag),
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data_len))
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goto out;
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offset += data_len;
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}
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}
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}
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if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
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goto out;
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if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
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@ -801,7 +830,8 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
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/* bpf program can never convert linear skb to non-linear */
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if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
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size = skb_headlen(skb);
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ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
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ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
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duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, ctx,
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sizeof(struct __sk_buff));
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@ -969,8 +999,8 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
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goto out;
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size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
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ret = bpf_test_finish(kattr, uattr, xdp.data_meta, size, retval,
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duration);
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ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size,
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retval, duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, ctx,
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sizeof(struct xdp_md));
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@ -1062,8 +1092,8 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
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if (ret < 0)
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goto out;
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ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
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retval, duration);
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ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
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sizeof(flow_keys), retval, duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, user_ctx,
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sizeof(struct bpf_flow_keys));
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@ -1167,7 +1197,7 @@ int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kat
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user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
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}
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ret = bpf_test_finish(kattr, uattr, NULL, 0, retval, duration);
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ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
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if (!ret)
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ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
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