From nobody Wed Dec 17 10:24:14 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A01FC77B73 for ; Thu, 20 Apr 2023 12:13:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234662AbjDTMNb (ORCPT ); Thu, 20 Apr 2023 08:13:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234002AbjDTMN1 (ORCPT ); Thu, 20 Apr 2023 08:13:27 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F04F5BBC; Thu, 20 Apr 2023 05:12:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1681992772; x=1713528772; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=NRLHbDsBJVpzWvjpCk2Jx+iKC43ICF+rlOYgCNSiUaM=; b=EboPsy9/3OWENkYyNUxLFr7Ly5iy7lIDdf5tH07BtCDnsy9I6jWMbqYL k25QuZi7xYrSbqgM5EzJzGcHWYe9agJGZsaiQOXvVxm8BxKSP/hm8WXXR ebNCmBy0H4GbXx0xyyjKTxLj+URRr6RzFltay/1MczLkgXoNLUeBrqh3c ADNtSACbOzU+EKsfdxjrfj4ihPBT7g+DTJ2dCqIhkAguXojkBxF39hlM8 ZlLAF599nUufvRRt9khKlXAVrZmPMFd3XDvbxHs+6/YLc7Kz7SVhn/iiu 2x0cZlwzPc0QzzWf7SqnBG/a5IObEx767ez+6cEFLBcPRjVpb2RMAfp83 Q==; X-IronPort-AV: E=Sophos;i="5.99,212,1677567600"; d="scan'208";a="209953526" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 20 Apr 2023 05:12:08 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Thu, 20 Apr 2023 05:12:08 -0700 Received: from soft-dev3-1.microsemi.net (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2507.21 via Frontend Transport; Thu, 20 Apr 2023 05:12:03 -0700 From: Horatiu Vultur To: , , CC: , , , , , , , , , , , Horatiu Vultur Subject: [PATCH net-next] net: lan966x: Don't use xdp_frame when action is XDP_TX Date: Thu, 20 Apr 2023 14:11:52 +0200 Message-ID: <20230420121152.2737625-1-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.38.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When the action of an xdp program was XDP_TX, lan966x was creating a xdp_frame and use this one to send the frame back. But it is also possible to send back the frame without needing a xdp_frame, because it possible to send it back using the page. And then once the frame is transmitted is possible to use directly page_pool_recycle_direct as lan966x is using page pools. This would save some CPU usage on this path. Signed-off-by: Horatiu Vultur --- .../ethernet/microchip/lan966x/lan966x_fdma.c | 35 +++++++++++-------- .../ethernet/microchip/lan966x/lan966x_main.h | 2 ++ .../ethernet/microchip/lan966x/lan966x_xdp.c | 11 +++--- 3 files changed, 27 insertions(+), 21 deletions(-) diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/driver= s/net/ethernet/microchip/lan966x/lan966x_fdma.c index 2ed76bb61a731..7947259e67e4e 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c @@ -390,6 +390,7 @@ static void lan966x_fdma_stop_netdev(struct lan966x *la= n966x) static void lan966x_fdma_tx_clear_buf(struct lan966x *lan966x, int weight) { struct lan966x_tx *tx =3D &lan966x->tx; + struct lan966x_rx *rx =3D &lan966x->rx; struct lan966x_tx_dcb_buf *dcb_buf; struct xdp_frame_bulk bq; struct lan966x_db *db; @@ -432,7 +433,8 @@ static void lan966x_fdma_tx_clear_buf(struct lan966x *l= an966x, int weight) if (dcb_buf->xdp_ndo) xdp_return_frame_bulk(dcb_buf->data.xdpf, &bq); else - xdp_return_frame_rx_napi(dcb_buf->data.xdpf); + page_pool_recycle_direct(rx->page_pool, + dcb_buf->data.page); } =20 clear =3D true; @@ -702,6 +704,7 @@ static void lan966x_fdma_tx_start(struct lan966x_tx *tx= , int next_to_use) int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, struct xdp_frame *xdpf, struct page *page, + u32 len, bool dma_map) { struct lan966x *lan966x =3D port->lan966x; @@ -722,6 +725,15 @@ int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, goto out; } =20 + /* Fill up the buffer */ + next_dcb_buf =3D &tx->dcbs_buf[next_to_use]; + next_dcb_buf->use_skb =3D false; + next_dcb_buf->xdp_ndo =3D dma_map; + next_dcb_buf->len =3D len + IFH_LEN_BYTES; + next_dcb_buf->used =3D true; + next_dcb_buf->ptp =3D false; + next_dcb_buf->dev =3D port->dev; + /* Generate new IFH */ if (dma_map) { if (xdpf->headroom < IFH_LEN_BYTES) { @@ -736,16 +748,18 @@ int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, =20 dma_addr =3D dma_map_single(lan966x->dev, xdpf->data - IFH_LEN_BYTES, - xdpf->len + IFH_LEN_BYTES, + len + IFH_LEN_BYTES, DMA_TO_DEVICE); if (dma_mapping_error(lan966x->dev, dma_addr)) { ret =3D NETDEV_TX_OK; goto out; } =20 + next_dcb_buf->data.xdpf =3D xdpf; + /* Setup next dcb */ lan966x_fdma_tx_setup_dcb(tx, next_to_use, - xdpf->len + IFH_LEN_BYTES, + len + IFH_LEN_BYTES, dma_addr); } else { ifh =3D page_address(page) + XDP_PACKET_HEADROOM; @@ -756,25 +770,18 @@ int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, dma_addr =3D page_pool_get_dma_addr(page); dma_sync_single_for_device(lan966x->dev, dma_addr + XDP_PACKET_HEADROOM, - xdpf->len + IFH_LEN_BYTES, + len + IFH_LEN_BYTES, DMA_TO_DEVICE); =20 + next_dcb_buf->data.page =3D page; + /* Setup next dcb */ lan966x_fdma_tx_setup_dcb(tx, next_to_use, - xdpf->len + IFH_LEN_BYTES, + len + IFH_LEN_BYTES, dma_addr + XDP_PACKET_HEADROOM); } =20 - /* Fill up the buffer */ - next_dcb_buf =3D &tx->dcbs_buf[next_to_use]; - next_dcb_buf->use_skb =3D false; - next_dcb_buf->data.xdpf =3D xdpf; - next_dcb_buf->xdp_ndo =3D dma_map; - next_dcb_buf->len =3D xdpf->len + IFH_LEN_BYTES; next_dcb_buf->dma_addr =3D dma_addr; - next_dcb_buf->used =3D true; - next_dcb_buf->ptp =3D false; - next_dcb_buf->dev =3D port->dev; =20 /* Start the transmission */ lan966x_fdma_tx_start(tx, next_to_use); diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/driver= s/net/ethernet/microchip/lan966x/lan966x_main.h index 851afb0166b19..59da35a2c93d4 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h @@ -243,6 +243,7 @@ struct lan966x_tx_dcb_buf { union { struct sk_buff *skb; struct xdp_frame *xdpf; + struct page *page; } data; u32 len; u32 used : 1; @@ -544,6 +545,7 @@ int lan966x_fdma_xmit(struct sk_buff *skb, __be32 *ifh,= struct net_device *dev); int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, struct xdp_frame *frame, struct page *page, + u32 len, bool dma_map); int lan966x_fdma_change_mtu(struct lan966x *lan966x); void lan966x_fdma_netdev_init(struct lan966x *lan966x, struct net_device *= dev); diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c b/drivers= /net/ethernet/microchip/lan966x/lan966x_xdp.c index 2e6f486ec67d7..a8ad1f4e431cb 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c @@ -62,7 +62,7 @@ int lan966x_xdp_xmit(struct net_device *dev, struct xdp_frame *xdpf =3D frames[i]; int err; =20 - err =3D lan966x_fdma_xmit_xdpf(port, xdpf, NULL, true); + err =3D lan966x_fdma_xmit_xdpf(port, xdpf, NULL, xdpf->len, true); if (err) break; =20 @@ -76,7 +76,6 @@ int lan966x_xdp_run(struct lan966x_port *port, struct pag= e *page, u32 data_len) { struct bpf_prog *xdp_prog =3D port->xdp_prog; struct lan966x *lan966x =3D port->lan966x; - struct xdp_frame *xdpf; struct xdp_buff xdp; u32 act; =20 @@ -90,11 +89,9 @@ int lan966x_xdp_run(struct lan966x_port *port, struct pa= ge *page, u32 data_len) case XDP_PASS: return FDMA_PASS; case XDP_TX: - xdpf =3D xdp_convert_buff_to_frame(&xdp); - if (!xdpf) - return FDMA_DROP; - - return lan966x_fdma_xmit_xdpf(port, xdpf, page, false) ? + return lan966x_fdma_xmit_xdpf(port, NULL, page, + data_len - IFH_LEN_BYTES, + false) ? FDMA_DROP : FDMA_TX; case XDP_REDIRECT: if (xdp_do_redirect(port->dev, &xdp, xdp_prog)) --=20 2.38.0