From patchwork Sun Dec 3 16:51:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Yoong Siang X-Patchwork-Id: 13477370 X-Patchwork-Delegate: bpf@iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="KuUKFyox" Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B7B76ED; Sun, 3 Dec 2023 08:52:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701622330; x=1733158330; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=tCaT+m3AZjSK8LbmXRU+Tyo86wv3zOjItJHIo8Ysuzk=; b=KuUKFyoxE6L9bC/jdzjslAvr+/msW+m2ARnSyJMPSHcPdhtAUMvdeWPn srBPOwMDMqO6+FzwC/PiCjS2i5weOPeOWIDVjC8MXoDAdP5fyaOgcZL3U U9153FbBTwyskO1PeiR+/Yhtl1A2tJ+1Z8KTDzp3pdWBSiJzfPH86OxSO HwIXJeQdm4S2OW1ze5HLW/BwComJCPPNP+6djPYRvQlGRkDxsWlHM1JfZ MXQkPt7WYsL5uTklqVDSuwMWsvEQ2srfsysx60tTfZ12Zf0I+Xwi3Cw43 Y4egTeWiDWywESxWDiyVNRJGYNbMXrzmXr5I49I/1N+NL1gJUz7lOF8GI w==; X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="706831" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="706831" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2023 08:52:09 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="799345417" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="799345417" Received: from p12ill20yoongsia.png.intel.com ([10.88.227.28]) by orsmga008.jf.intel.com with ESMTP; 03 Dec 2023 08:51:58 -0800 From: Song Yoong Siang To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Bjorn Topel , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Lorenzo Bianconi , Tariq Toukan , Willem de Bruijn , Maxime Coquelin , Andrii Nakryiko , Mykola Lysenko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Shuah Khan , Alexandre Torgue , Jose Abreu Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, bpf@vger.kernel.org, xdp-hints@xdp-project.net, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Song Yoong Siang Subject: [PATCH bpf-next v3 1/3] xsk: add Launch Time HW offload to XDP Tx metadata Date: Mon, 4 Dec 2023 00:51:27 +0800 Message-Id: <20231203165129.1740512-2-yoong.siang.song@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231203165129.1740512-1-yoong.siang.song@intel.com> References: <20231203165129.1740512-1-yoong.siang.song@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net This patch extends the XDP Tx metadata framework so that user can requests Launch Time hardware offload, where the NIC will schedule the packet for transmission at a pre-determined time called launch time. The value of launch time is communicated from user space to Ethernet driver via launch_time field of struct xsk_tx_metadata. Suggested-by: Stanislav Fomichev Signed-off-by: Song Yoong Siang --- Documentation/netlink/specs/netdev.yaml | 4 ++++ Documentation/networking/xsk-tx-metadata.rst | 4 ++++ include/net/xdp_sock.h | 10 ++++++++++ include/net/xdp_sock_drv.h | 1 + include/uapi/linux/if_xdp.h | 9 +++++++++ include/uapi/linux/netdev.h | 3 +++ net/core/netdev-genl.c | 2 ++ net/xdp/xsk.c | 3 +++ tools/include/uapi/linux/if_xdp.h | 9 +++++++++ tools/include/uapi/linux/netdev.h | 3 +++ tools/net/ynl/generated/netdev-user.c | 1 + 11 files changed, 49 insertions(+) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml index eef6358ec587..a8bec7ddbdb0 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -66,6 +66,10 @@ definitions: name: tx-checksum doc: L3 checksum HW offload is supported by the driver. + - + name: launch-time + doc: + Launch Time HW offload is supported by the driver. attribute-sets: - diff --git a/Documentation/networking/xsk-tx-metadata.rst b/Documentation/networking/xsk-tx-metadata.rst index 97ecfa480d00..6d53e191d4ae 100644 --- a/Documentation/networking/xsk-tx-metadata.rst +++ b/Documentation/networking/xsk-tx-metadata.rst @@ -44,6 +44,9 @@ The flags field enables the particular offload: checksum. ``csum_start`` specifies byte offset of where the checksumming should start and ``csum_offset`` specifies byte offset where the device should store the computed checksum. +- ``XDP_TXMD_FLAGS_LAUNCH_TIME``: requests Launch Time HW offload to + launch the packet at a pre-determined time. ``launch_time`` indicates + the time which the NIC should schedule the packet for transmission. Besides the flags above, in order to trigger the offloads, the first packet's ``struct xdp_desc`` descriptor should set ``XDP_TX_METADATA`` @@ -68,6 +71,7 @@ Refer to ``xsk-flags`` features bitmask in - ``tx-timestamp``: device supports ``XDP_TXMD_FLAGS_TIMESTAMP`` - ``tx-checksum``: device supports ``XDP_TXMD_FLAGS_CHECKSUM`` +- ``launch-time``: device supports ``XDP_TXMD_FLAGS_LAUNCH_TIME`` See ``tools/net/ynl/samples/netdev.c`` on how to query this information. diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h index 3cb4dc9bd70e..516baa8a3b1f 100644 --- a/include/net/xdp_sock.h +++ b/include/net/xdp_sock.h @@ -110,11 +110,16 @@ struct xdp_sock { * indicates position where checksumming should start. * csum_offset indicates position where checksum should be stored. * + * void (*tmo_request_launch_time)(u64 launch_time, void *priv) + * Called when AF_XDP frame requested Launch Time HW offload support. + * launch_time indicates the time which the NIC should schedule the packet for + * transmission. */ struct xsk_tx_metadata_ops { void (*tmo_request_timestamp)(void *priv); u64 (*tmo_fill_timestamp)(void *priv); void (*tmo_request_checksum)(u16 csum_start, u16 csum_offset, void *priv); + void (*tmo_request_launch_time)(u64 launch_time, void *priv); }; #ifdef CONFIG_XDP_SOCKETS @@ -170,6 +175,11 @@ static inline void xsk_tx_metadata_request(const struct xsk_tx_metadata *meta, if (meta->flags & XDP_TXMD_FLAGS_CHECKSUM) ops->tmo_request_checksum(meta->request.csum_start, meta->request.csum_offset, priv); + + if (ops->tmo_request_launch_time) + if (meta->flags & XDP_TXMD_FLAGS_LAUNCH_TIME) + ops->tmo_request_launch_time(meta->request.launch_time, + priv); } /** diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h index 81e02de3f453..5b88559e956b 100644 --- a/include/net/xdp_sock_drv.h +++ b/include/net/xdp_sock_drv.h @@ -168,6 +168,7 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr) #define XDP_TXMD_FLAGS_VALID ( \ XDP_TXMD_FLAGS_TIMESTAMP | \ XDP_TXMD_FLAGS_CHECKSUM | \ + XDP_TXMD_FLAGS_LAUNCH_TIME | \ 0) static inline bool xsk_buff_valid_tx_metadata(struct xsk_tx_metadata *meta) diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h index d31698410410..e81bed455ec1 100644 --- a/include/uapi/linux/if_xdp.h +++ b/include/uapi/linux/if_xdp.h @@ -123,6 +123,12 @@ struct xdp_options { */ #define XDP_TXMD_FLAGS_CHECKSUM (1 << 1) +/* Request Launch Time HW offload to launch the packet at a pre-determined time. + * The time which the NIC should schedule the packet for transmission is + * communicated via launch_time field of struct xsk_tx_metadata. + */ +#define XDP_TXMD_FLAGS_LAUNCH_TIME (1 << 2) + /* AF_XDP offloads request. 'request' union member is consumed by the driver * when the packet is being transmitted. 'completion' union member is * filled by the driver when the transmit completion arrives. @@ -138,6 +144,9 @@ struct xsk_tx_metadata { __u16 csum_start; /* Offset from csum_start where checksum should be stored. */ __u16 csum_offset; + + /* XDP_TXMD_FLAGS_LAUNCH_TIME */ + __u64 launch_time; } request; struct { diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index 6244c0164976..b77baf1cffd7 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -56,10 +56,13 @@ enum netdev_xdp_rx_metadata { * by the driver. * @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the * driver. + * @NETDEV_XSK_FLAGS_LAUNCH_TIME: Launch Time HW offload is supported by the + * driver. */ enum netdev_xsk_flags { NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1, NETDEV_XSK_FLAGS_TX_CHECKSUM = 2, + NETDEV_XSK_FLAGS_LAUNCH_TIME = 3, }; enum { diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 10f2124e9e23..c38521269b4e 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -33,6 +33,8 @@ XDP_METADATA_KFUNC_xxx xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP; if (netdev->xsk_tx_metadata_ops->tmo_request_checksum) xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM; + if (netdev->xsk_tx_metadata_ops->tmo_request_launch_time) + xsk_features |= NETDEV_XSK_FLAGS_LAUNCH_TIME; } if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) || diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 281d49b4fca4..ad98ac6adb43 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -751,6 +751,9 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, goto free_err; } } + + if (meta->flags & XDP_TXMD_FLAGS_LAUNCH_TIME) + skb->skb_mstamp_ns = meta->request.launch_time; } } diff --git a/tools/include/uapi/linux/if_xdp.h b/tools/include/uapi/linux/if_xdp.h index 638c606dfa74..b9c5eeef0bfb 100644 --- a/tools/include/uapi/linux/if_xdp.h +++ b/tools/include/uapi/linux/if_xdp.h @@ -123,6 +123,12 @@ struct xdp_options { */ #define XDP_TXMD_FLAGS_CHECKSUM (1 << 1) +/* Request Launch Time HW offload to launch the packet at a pre-determined time. + * The time which the NIC should schedule the packet for transmission is + * communicated via launch_time field of struct xsk_tx_metadata. + */ +#define XDP_TXMD_FLAGS_LAUNCH_TIME (1 << 2) + /* AF_XDP offloads request. 'request' union member is consumed by the driver * when the packet is being transmitted. 'completion' union member is * filled by the driver when the transmit completion arrives. @@ -138,6 +144,9 @@ struct xsk_tx_metadata { __u16 csum_start; /* Offset from csum_start where checksum should be stored. */ __u16 csum_offset; + + /* XDP_TXMD_FLAGS_LAUNCH_TIME */ + __u64 launch_time; } request; struct { diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h index 6244c0164976..b77baf1cffd7 100644 --- a/tools/include/uapi/linux/netdev.h +++ b/tools/include/uapi/linux/netdev.h @@ -56,10 +56,13 @@ enum netdev_xdp_rx_metadata { * by the driver. * @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the * driver. + * @NETDEV_XSK_FLAGS_LAUNCH_TIME: Launch Time HW offload is supported by the + * driver. */ enum netdev_xsk_flags { NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1, NETDEV_XSK_FLAGS_TX_CHECKSUM = 2, + NETDEV_XSK_FLAGS_LAUNCH_TIME = 3, }; enum { diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c index 3b9dee94d4ce..5f20b23b64ba 100644 --- a/tools/net/ynl/generated/netdev-user.c +++ b/tools/net/ynl/generated/netdev-user.c @@ -66,6 +66,7 @@ const char *netdev_xdp_rx_metadata_str(enum netdev_xdp_rx_metadata value) static const char * const netdev_xsk_flags_strmap[] = { [0] = "tx-timestamp", [1] = "tx-checksum", + [2] = "launch-time" }; const char *netdev_xsk_flags_str(enum netdev_xsk_flags value) From patchwork Sun Dec 3 16:51:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Yoong Siang X-Patchwork-Id: 13477371 X-Patchwork-Delegate: bpf@iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="NKC9j9i7" Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7ED08E8; Sun, 3 Dec 2023 08:52:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701622342; x=1733158342; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=N9rjqssMGbAvr291sISynJdKrrI2CBF9OefB6kNHY6c=; b=NKC9j9i7fQN66ptshVzMwsPIkZ6w9V0TLjCogwmW6NfxoZ7E4KC9EH2v 3fzRanbpbMgFXA0lJ/YHWEO6NpP3Mav7DaDMIe+ZZwAMRxNHQCKTSkM+6 YiLt2pYP352za6SUGCL4OqQPwcuNyt21wEEplhMcm/yBhjkvsstpm2SsO WX22kMRmfM6VaUa2dOb7fArR16Ni7jQiGzwM9KXRWPqZml1Oh8iuZ9pnV f6c8s0gAVyHSdoD9tmk7UaC/wfOEob7fRLOxy1hZADIyFXgJHrKLPobu5 DkTVtyNyvMIg0qA1Z/KHzrvf/Rp5wItutX2dJzwPVGoMxRMZ9WlXGTw0z Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="706847" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="706847" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2023 08:52:21 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="799345480" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="799345480" Received: from p12ill20yoongsia.png.intel.com ([10.88.227.28]) by orsmga008.jf.intel.com with ESMTP; 03 Dec 2023 08:52:11 -0800 From: Song Yoong Siang To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Bjorn Topel , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Lorenzo Bianconi , Tariq Toukan , Willem de Bruijn , Maxime Coquelin , Andrii Nakryiko , Mykola Lysenko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Shuah Khan , Alexandre Torgue , Jose Abreu Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, bpf@vger.kernel.org, xdp-hints@xdp-project.net, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Song Yoong Siang Subject: [PATCH bpf-next v3 2/3] net: stmmac: add Launch Time support to XDP ZC Date: Mon, 4 Dec 2023 00:51:28 +0800 Message-Id: <20231203165129.1740512-3-yoong.siang.song@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231203165129.1740512-1-yoong.siang.song@intel.com> References: <20231203165129.1740512-1-yoong.siang.song@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net This patch enables Launch Time (Time-Based Scheduling) support to XDP zero copy via XDP Tx metadata framework. Signed-off-by: Song Yoong Siang --- drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 ++ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index 686c94c2e8a7..e8538af6e207 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h @@ -105,6 +105,8 @@ struct stmmac_metadata_request { struct stmmac_priv *priv; struct dma_desc *tx_desc; bool *set_ic; + struct dma_edesc *edesc; + int tbs; }; struct stmmac_xsk_tx_complete { diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index c2ac88aaffed..1fe80bfae24b 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2465,9 +2465,20 @@ static u64 stmmac_xsk_fill_timestamp(void *_priv) return 0; } +static void stmmac_xsk_request_launch_time(u64 launch_time, void *_priv) +{ + struct stmmac_metadata_request *meta_req = _priv; + struct timespec64 ts = ns_to_timespec64(launch_time); + + if (meta_req->tbs & STMMAC_TBS_EN) + stmmac_set_desc_tbs(meta_req->priv, meta_req->edesc, ts.tv_sec, + ts.tv_nsec); +} + static const struct xsk_tx_metadata_ops stmmac_xsk_tx_metadata_ops = { .tmo_request_timestamp = stmmac_xsk_request_timestamp, .tmo_fill_timestamp = stmmac_xsk_fill_timestamp, + .tmo_request_launch_time = stmmac_xsk_request_launch_time, }; static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget) @@ -2545,6 +2556,8 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget) meta_req.priv = priv; meta_req.tx_desc = tx_desc; meta_req.set_ic = &set_ic; + meta_req.tbs = tx_q->tbs; + meta_req.edesc = &tx_q->dma_entx[entry]; xsk_tx_metadata_request(meta, &stmmac_xsk_tx_metadata_ops, &meta_req); if (set_ic) { From patchwork Sun Dec 3 16:51:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Yoong Siang X-Patchwork-Id: 13477372 X-Patchwork-Delegate: bpf@iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="KbX2ippj" Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D510A106; Sun, 3 Dec 2023 08:52:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701622354; x=1733158354; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=EA2ji1tKwR3xZ86ktJFvtkVW0seRxPfhzpnrXQXAqB4=; b=KbX2ippj1PaACm0L/STZvJXEIuCSVeRW3+51NiiqUGhFG3aU8WmuMnng n6pBUbdggDWh9pGZsZsWHpeaGXq9jyehvVv7c7L41zSxqW1HHbzVQQoow 3KuRXjeRpzQXXAPdSOicV0AgAW0EDQi5drmGC4t+X+07cOFHL76UhBtS4 M+mdWwooQ1FxhppcWaCQqS5IhCZQO1dOo6UsEtjgIueOXHdeFxowwVglS LPP6MD4Ua8h9ghHiVIuyPeAysmW/99Jz9wQmJwX1lQtgvxavqc0ERmdqX ScWPmZP1CIbl7Gfj+jrjQWLlgJf3c/gv2bBNmqYK/hAkB30y2MKQWZHgM A==; X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="706864" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="706864" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2023 08:52:33 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10913"; a="799345527" X-IronPort-AV: E=Sophos;i="6.04,247,1695711600"; d="scan'208";a="799345527" Received: from p12ill20yoongsia.png.intel.com ([10.88.227.28]) by orsmga008.jf.intel.com with ESMTP; 03 Dec 2023 08:52:24 -0800 From: Song Yoong Siang To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Bjorn Topel , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Lorenzo Bianconi , Tariq Toukan , Willem de Bruijn , Maxime Coquelin , Andrii Nakryiko , Mykola Lysenko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Shuah Khan , Alexandre Torgue , Jose Abreu Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, bpf@vger.kernel.org, xdp-hints@xdp-project.net, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Song Yoong Siang Subject: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to xdp_hw_metadata Date: Mon, 4 Dec 2023 00:51:29 +0800 Message-Id: <20231203165129.1740512-4-yoong.siang.song@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231203165129.1740512-1-yoong.siang.song@intel.com> References: <20231203165129.1740512-1-yoong.siang.song@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net This patch adds Launch Time hw offload request to xdp_hw_metadata. User can configure the delta of HW launch time to HW RX-time by using "-l" argument. The default delta is set to 0.1 second. This patch is tested with stmmac on Intel Tiger Lake platform. Refer to result below, the delta between pre-determined launch time and actual HW transmit complete time is around 24 us. $ sudo ./xdp_hw_metadata eth0 ... xsk_ring_cons__peek: 1 0x55e577c3a7a8: rx_desc[0]->addr=80100 addr=80100 comp_addr=80100 EoP No rx_hash err=-95 HW RX-time: 1677762523393813392 (sec:1677762523.3938) delta to User RX-time sec:0.0003 (259.290 usec) XDP RX-time: 1677762523394050576 (sec:1677762523.3941) delta to User RX-time sec:0.0000 (22.106 usec) 0x55e577c3a7a8: ping-pong with csum=5619 (want 8626) csum_start=34 csum_offset=6 HW RX-time: 1677762523393813392 (sec:1677762523.3938) delta to HW Launch-time sec:0.1000 (100000.000 usec) 0x55e577c3a7a8: complete tx idx=0 addr=18 HW Launch-time: 1677762523493813392 (sec:1677762523.4938) delta to HW TX-complete-time sec:0.0000 (24.181 usec) HW TX-complete-time: 1677762523493837573 (sec:1677762523.4938) delta to User TX-complete-time sec:0.0007 (737.636 usec) XDP RX-time: 1677762523394050576 (sec:1677762523.3941) delta to User TX-complete-time sec:0.1005 (100524.633 usec) HW RX-time: 1677762523393813392 (sec:1677762523.3938) delta to HW TX-complete-time sec:0.1000 (100024.181 usec) 0x55e577c3a7a8: complete rx idx=128 addr=80100 $ sudo ./xdp_hw_metadata eth0 -l 10000000 ... poll: 1 (0) skip=17 fail=0 redir=17 xsk_ring_cons__peek: 1 0x558336d397a8: rx_desc[15]->addr=9e100 addr=9e100 comp_addr=9e100 EoP No rx_hash err=-95 HW RX-time: 1677762699254666655 (sec:1677762699.2547) delta to User RX-time sec:0.0003 (256.928 usec) XDP RX-time: 1677762699254901232 (sec:1677762699.2549) delta to User RX-time sec:0.0000 (22.351 usec) 0x558336d397a8: ping-pong with csum=5619 (want 8626) csum_start=34 csum_offset=6 HW RX-time: 1677762699254666655 (sec:1677762699.2547) delta to HW Launch-time sec:0.0100 (10000.000 usec) 0x558336d397a8: complete tx idx=15 addr=f018 HW Launch-time: 1677762699264666655 (sec:1677762699.2647) delta to HW TX-complete-time sec:0.0000 (24.307 usec) HW TX-complete-time: 1677762699264690962 (sec:1677762699.2647) delta to User TX-complete-time sec:0.0003 (309.901 usec) XDP RX-time: 1677762699254901232 (sec:1677762699.2549) delta to User TX-complete-time sec:0.0101 (10099.631 usec) HW RX-time: 1677762699254666655 (sec:1677762699.2547) delta to HW TX-complete-time sec:0.0100 (10024.307 usec) 0x558336d397a8: complete rx idx=143 addr=9e100 Signed-off-by: Song Yoong Siang --- tools/testing/selftests/bpf/xdp_hw_metadata.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c index 3291625ba4fb..3e238bb310b7 100644 --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c @@ -13,6 +13,7 @@ * - UDP 9091 packets trigger TX reply * - TX HW timestamp is requested and reported back upon completion * - TX checksum is requested + * - HW launch time is set for transmission */ #include @@ -61,6 +62,8 @@ int rxq; bool skip_tx; __u64 last_hw_rx_timestamp; __u64 last_xdp_rx_timestamp; +__u64 last_launch_time; +__u64 launch_time_delta_to_hw_rx_timestamp = 100000000; /* 0.1 second */ void test__fail(void) { /* for network_helpers.c */ } @@ -274,6 +277,8 @@ static bool complete_tx(struct xsk *xsk, clockid_t clock_id) if (meta->completion.tx_timestamp) { __u64 ref_tstamp = gettime(clock_id); + print_tstamp_delta("HW Launch-time", "HW TX-complete-time", + last_launch_time, meta->completion.tx_timestamp); print_tstamp_delta("HW TX-complete-time", "User TX-complete-time", meta->completion.tx_timestamp, ref_tstamp); print_tstamp_delta("XDP RX-time", "User TX-complete-time", @@ -371,6 +376,14 @@ static void ping_pong(struct xsk *xsk, void *rx_packet, clockid_t clock_id) xsk, ntohs(udph->check), ntohs(want_csum), meta->request.csum_start, meta->request.csum_offset); + /* Set the value of launch time */ + meta->flags |= XDP_TXMD_FLAGS_LAUNCH_TIME; + meta->request.launch_time = last_hw_rx_timestamp + + launch_time_delta_to_hw_rx_timestamp; + last_launch_time = meta->request.launch_time; + print_tstamp_delta("HW RX-time", "HW Launch-time", last_hw_rx_timestamp, + meta->request.launch_time); + memcpy(data, rx_packet, len); /* don't share umem chunk for simplicity */ tx_desc->options |= XDP_TX_METADATA; tx_desc->len = len; @@ -595,6 +608,7 @@ static void print_usage(void) " -h Display this help and exit\n\n" " -m Enable multi-buffer XDP for larger MTU\n" " -r Don't generate AF_XDP reply (rx metadata only)\n" + " -l Delta of HW Launch-time to HW RX-time in ns (default: 0.1s)\n" "Generate test packets on the other machine with:\n" " echo -n xdp | nc -u -q1 9091\n"; @@ -605,7 +619,7 @@ static void read_args(int argc, char *argv[]) { int opt; - while ((opt = getopt(argc, argv, "chmr")) != -1) { + while ((opt = getopt(argc, argv, "chmrl:")) != -1) { switch (opt) { case 'c': bind_flags &= ~XDP_USE_NEED_WAKEUP; @@ -621,6 +635,9 @@ static void read_args(int argc, char *argv[]) case 'r': skip_tx = true; break; + case 'l': + launch_time_delta_to_hw_rx_timestamp = atoll(optarg); + break; case '?': if (isprint(optopt)) fprintf(stderr, "Unknown option: -%c\n", optopt);