From patchwork Mon Dec 7 16:32:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 11956353 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 774A0C2BBCA for ; Mon, 7 Dec 2020 16:34:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50B01238E7 for ; Mon, 7 Dec 2020 16:34:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726718AbgLGQe0 (ORCPT ); Mon, 7 Dec 2020 11:34:26 -0500 Received: from mail.kernel.org ([198.145.29.99]:33016 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727017AbgLGQeZ (ORCPT ); Mon, 7 Dec 2020 11:34:25 -0500 From: Lorenzo Bianconi Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, shayagr@amazon.com, sameehj@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com, echaudro@redhat.com, lorenzo.bianconi@redhat.com, jasowang@redhat.com Subject: [PATCH v5 bpf-next 09/14] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Date: Mon, 7 Dec 2020 17:32:38 +0100 Message-Id: X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net introduce xdp_shared_info pointer in bpf_test_finish signature in order to copy back paged data from a xdp multi-buff frame to userspace buffer Signed-off-by: Lorenzo Bianconi --- net/bpf/test_run.c | 46 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index e4b7b749184d..32cda04ac7fb 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -81,7 +81,8 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, static int bpf_test_finish(const union bpf_attr *kattr, union bpf_attr __user *uattr, const void *data, - u32 size, u32 retval, u32 duration) + struct xdp_shared_info *xdp_sinfo, u32 size, + u32 retval, u32 duration) { void __user *data_out = u64_to_user_ptr(kattr->test.data_out); int err = -EFAULT; @@ -96,8 +97,37 @@ static int bpf_test_finish(const union bpf_attr *kattr, err = -ENOSPC; } - if (data_out && copy_to_user(data_out, data, copy_size)) - goto out; + if (data_out) { + int len = xdp_sinfo ? copy_size - xdp_sinfo->data_length + : copy_size; + + if (copy_to_user(data_out, data, len)) + goto out; + + if (xdp_sinfo) { + int i, offset = len, data_len; + + for (i = 0; i < xdp_sinfo->nr_frags; i++) { + skb_frag_t *frag = &xdp_sinfo->frags[i]; + + if (offset >= copy_size) { + err = -ENOSPC; + break; + } + + data_len = min_t(int, copy_size - offset, + xdp_get_frag_size(frag)); + + if (copy_to_user(data_out + offset, + xdp_get_frag_address(frag), + data_len)) + goto out; + + offset += data_len; + } + } + } + if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size))) goto out; if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) @@ -598,7 +628,8 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, /* bpf program can never convert linear skb to non-linear */ if (WARN_ON_ONCE(skb_is_nonlinear(skb))) size = skb_headlen(skb); - ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration); + ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval, + duration); if (!ret) ret = bpf_ctx_finish(kattr, uattr, ctx, sizeof(struct __sk_buff)); @@ -683,7 +714,8 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, goto out; size = xdp.data_end - xdp.data + xdp_sinfo->data_length; - ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration); + ret = bpf_test_finish(kattr, uattr, xdp.data, xdp_sinfo, size, retval, + duration); out: bpf_prog_change_xdp(prog, NULL); @@ -794,8 +826,8 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, do_div(time_spent, repeat); duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent; - ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys), - retval, duration); + ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL, + sizeof(flow_keys), retval, duration); if (!ret) ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(struct bpf_flow_keys));