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{
    "id": 1375811,
    "url": "http://patchwork.ozlabs.org/api/patches/1375811/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/25a087aee8345fd87244d2e860e6636db36af01a.1601648734.git.lorenzo@kernel.org/",
    "project": {
        "id": 7,
        "url": "http://patchwork.ozlabs.org/api/projects/7/?format=api",
        "name": "Linux network development",
        "link_name": "netdev",
        "list_id": "netdev.vger.kernel.org",
        "list_email": "netdev@vger.kernel.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<25a087aee8345fd87244d2e860e6636db36af01a.1601648734.git.lorenzo@kernel.org>",
    "list_archive_url": null,
    "date": "2020-10-02T14:42:08",
    "name": "[v4,bpf-next,10/13] bpf: test_run: add skb_shared_info pointer in bpf_test_finish signature",
    "commit_ref": null,
    "pull_url": null,
    "state": "changes-requested",
    "archived": false,
    "hash": "37648430f834f8531ea138f08060a0f17fc10bb6",
    "submitter": {
        "id": 76007,
        "url": "http://patchwork.ozlabs.org/api/people/76007/?format=api",
        "name": "Lorenzo Bianconi",
        "email": "lorenzo@kernel.org"
    },
    "delegate": {
        "id": 77147,
        "url": "http://patchwork.ozlabs.org/api/users/77147/?format=api",
        "username": "bpf",
        "first_name": "BPF",
        "last_name": "Maintainers",
        "email": "bpf@iogearbox.net"
    },
    "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/25a087aee8345fd87244d2e860e6636db36af01a.1601648734.git.lorenzo@kernel.org/mbox/",
    "series": [
        {
            "id": 205635,
            "url": "http://patchwork.ozlabs.org/api/series/205635/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=205635",
            "date": "2020-10-02T14:41:58",
            "name": "mvneta: introduce XDP multi-buffer support",
            "version": 4,
            "mbox": "http://patchwork.ozlabs.org/series/205635/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/1375811/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/1375811/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<netdev-owner@vger.kernel.org>",
        "X-Original-To": "patchwork-incoming-netdev@ozlabs.org",
        "Delivered-To": "patchwork-incoming-netdev@ozlabs.org",
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        ],
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n        s=default; t=1601649787;\n        bh=nTkR6CoGaIVQB6iOYx0cq2wjexcHkxglFc3NY+26Wsw=;\n        h=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n        b=Ux2FDOoM8BjL412Vr1UJU5hLGWpEa17G0a1LiL+kj5JCLk2juJr37L64GaJv3iSmt\n         xGfecMnzxslUMZAm4XO5tLy4fEZB2fDDTN+dCqzDUvtu4BKAJPqTWETbadlsvJkGu8\n         D+SE2TFTsp87i5mSN++6nP+eS51p+SeY/TDTIG50=",
        "From": "Lorenzo Bianconi <lorenzo@kernel.org>",
        "To": "bpf@vger.kernel.org, netdev@vger.kernel.org",
        "Cc": "davem@davemloft.net, kuba@kernel.org, ast@kernel.org,\n        daniel@iogearbox.net, shayagr@amazon.com, sameehj@amazon.com,\n        john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com,\n        lorenzo.bianconi@redhat.com, echaudro@redhat.com",
        "Subject": "[PATCH v4 bpf-next 10/13] bpf: test_run: add skb_shared_info pointer\n in bpf_test_finish signature",
        "Date": "Fri,  2 Oct 2020 16:42:08 +0200",
        "Message-Id": "\n <25a087aee8345fd87244d2e860e6636db36af01a.1601648734.git.lorenzo@kernel.org>",
        "X-Mailer": "git-send-email 2.26.2",
        "In-Reply-To": "<cover.1601648734.git.lorenzo@kernel.org>",
        "References": "<cover.1601648734.git.lorenzo@kernel.org>",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit",
        "Precedence": "bulk",
        "List-ID": "<netdev.vger.kernel.org>",
        "X-Mailing-List": "netdev@vger.kernel.org"
    },
    "content": "introduce skb_shared_info pointer in bpf_test_finish signature in order\nto copy back paged data from a xdp multi-buff frame to userspace buffer\n\nTested-by: Eelco Chaudron <echaudro@redhat.com>\nSigned-off-by: Lorenzo Bianconi <lorenzo@kernel.org>\n---\n net/bpf/test_run.c | 58 ++++++++++++++++++++++++++++++++++++++++------\n 1 file changed, 51 insertions(+), 7 deletions(-)",
    "diff": "diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c\nindex ec7286cd051b..7e33181f88ee 100644\n--- a/net/bpf/test_run.c\n+++ b/net/bpf/test_run.c\n@@ -79,9 +79,23 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,\n \treturn ret;\n }\n \n+static int bpf_test_get_buff_data_len(struct skb_shared_info *sinfo)\n+{\n+\tint i, size = 0;\n+\n+\tif (likely(!sinfo))\n+\t\treturn 0;\n+\n+\tfor (i = 0; i < sinfo->nr_frags; i++)\n+\t\tsize += skb_frag_size(&sinfo->frags[i]);\n+\n+\treturn size;\n+}\n+\n static int bpf_test_finish(const union bpf_attr *kattr,\n \t\t\t   union bpf_attr __user *uattr, const void *data,\n-\t\t\t   u32 size, u32 retval, u32 duration)\n+\t\t\t   struct skb_shared_info *sinfo, u32 size,\n+\t\t\t   u32 retval, u32 duration)\n {\n \tvoid __user *data_out = u64_to_user_ptr(kattr->test.data_out);\n \tint err = -EFAULT;\n@@ -96,8 +110,35 @@ static int bpf_test_finish(const union bpf_attr *kattr,\n \t\terr = -ENOSPC;\n \t}\n \n-\tif (data_out && copy_to_user(data_out, data, copy_size))\n-\t\tgoto out;\n+\tif (data_out) {\n+\t\tint len = copy_size - bpf_test_get_buff_data_len(sinfo);\n+\n+\t\tif (copy_to_user(data_out, data, len))\n+\t\t\tgoto out;\n+\n+\t\tif (sinfo) {\n+\t\t\tint i, offset = len, data_len;\n+\n+\t\t\tfor (i = 0; i < sinfo->nr_frags; i++) {\n+\t\t\t\tskb_frag_t *frag = &sinfo->frags[i];\n+\n+\t\t\t\tif (offset >= copy_size) {\n+\t\t\t\t\terr = -ENOSPC;\n+\t\t\t\t\tbreak;\n+\t\t\t\t}\n+\n+\t\t\t\tdata_len = min_t(int, copy_size - offset,\n+\t\t\t\t\t\t skb_frag_size(frag));\n+\t\t\t\tif (copy_to_user(data_out + offset,\n+\t\t\t\t\t\t skb_frag_address(frag),\n+\t\t\t\t\t\t data_len))\n+\t\t\t\t\tgoto out;\n+\n+\t\t\t\toffset += data_len;\n+\t\t\t}\n+\t\t}\n+\t}\n+\n \tif (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))\n \t\tgoto out;\n \tif (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))\n@@ -598,7 +639,8 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,\n \t/* bpf program can never convert linear skb to non-linear */\n \tif (WARN_ON_ONCE(skb_is_nonlinear(skb)))\n \t\tsize = skb_headlen(skb);\n-\tret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);\n+\tret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,\n+\t\t\t      duration);\n \tif (!ret)\n \t\tret = bpf_ctx_finish(kattr, uattr, ctx,\n \t\t\t\t     sizeof(struct __sk_buff));\n@@ -683,7 +725,9 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,\n \tif (xdp.data != data + headroom || xdp.data_end != xdp.data + size)\n \t\tsize += xdp.data_end - xdp.data - data_len;\n \n-\tret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);\n+\tret = bpf_test_finish(kattr, uattr, xdp.data, sinfo, size, retval,\n+\t\t\t      duration);\n+\n out:\n \tbpf_prog_change_xdp(prog, NULL);\n \tfor (i = 0; i < sinfo->nr_frags; i++)\n@@ -793,8 +837,8 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,\n \tdo_div(time_spent, repeat);\n \tduration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;\n \n-\tret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),\n-\t\t\t      retval, duration);\n+\tret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,\n+\t\t\t      sizeof(flow_keys), retval, duration);\n \tif (!ret)\n \t\tret = bpf_ctx_finish(kattr, uattr, user_ctx,\n \t\t\t\t     sizeof(struct bpf_flow_keys));\n",
    "prefixes": [
        "v4",
        "bpf-next",
        "10/13"
    ]
}