From patchwork Sun Nov 6 21:11:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Horatiu Vultur X-Patchwork-Id: 13033574 X-Patchwork-Delegate: kuba@kernel.org 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 4B877C4332F for ; Sun, 6 Nov 2022 21:07:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230259AbiKFVHo (ORCPT ); Sun, 6 Nov 2022 16:07:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230187AbiKFVHe (ORCPT ); Sun, 6 Nov 2022 16:07:34 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 875C91183B; Sun, 6 Nov 2022 13:07:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1667768853; x=1699304853; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9EaKjxyRgL3ce9mWgRq8+a6jtQ3V00iuJxjk1OMiI84=; b=WCOJ1fvD3apjo+Ln6dqRzETiUblSoEOQvT4X6imaGvbiN0JZ5r2li3gL +FPhwjl83wMxDBk3/wYnjEZLd1qaNIEhNOH6LfQkDWKGejva7qCSudOo1 tEQddmSaQdS96utSeM9cR7azTigG5P6DSbB6uKZ0gqsTyv8423GbI5nsZ bfv1GdxThJ+7Z/BDbsQuVEWfVcw3sMimq/aP9tmZvhZJgRbJXRQz+JZIR XgbAJ07dUAWHiWBeKrgE1AGzjm3b8M+sfkE3elZOPXo9spAvUObVpA0L8 Fw3lMrWQcKjp0FcNK9ymvV9/Vpis7FOYctjT1xKxsngoJxQu6FHr3p5hj w==; X-IronPort-AV: E=Sophos;i="5.96,142,1665471600"; d="scan'208";a="122044427" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 06 Nov 2022 14:07:32 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Sun, 6 Nov 2022 14:07:31 -0700 Received: from soft-dev3-1.microsemi.net (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Sun, 6 Nov 2022 14:07:29 -0700 From: Horatiu Vultur To: , , CC: , , , , , , , , , Horatiu Vultur Subject: [PATCH net-next v2 2/4] net: lan966x: Split function lan966x_fdma_rx_get_frame Date: Sun, 6 Nov 2022 22:11:52 +0100 Message-ID: <20221106211154.3225784-3-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221106211154.3225784-1-horatiu.vultur@microchip.com> References: <20221106211154.3225784-1-horatiu.vultur@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The function lan966x_fdma_rx_get_frame was unmapping the frame from device and check also if the frame was received on a valid port. And only after that it tried to generate the skb. Move this check in a different function, in preparation for xdp support. Such that xdp to be added here and the lan966x_fdma_rx_get_frame to be used only when giving the skb to upper layers. Signed-off-by: Horatiu Vultur --- .../ethernet/microchip/lan966x/lan966x_fdma.c | 85 +++++++++++++------ .../ethernet/microchip/lan966x/lan966x_main.h | 9 ++ 2 files changed, 69 insertions(+), 25 deletions(-) diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c index 6c102ee20f1d7..d37765ddd53ae 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c @@ -54,6 +54,17 @@ static void lan966x_fdma_rx_free_pages(struct lan966x_rx *rx) } } +static void lan966x_fdma_rx_free_page(struct lan966x_rx *rx) +{ + struct page *page; + + page = rx->page[rx->dcb_index][rx->db_index]; + if (unlikely(!page)) + return; + + __free_pages(page, rx->page_order); +} + static void lan966x_fdma_rx_add_dcb(struct lan966x_rx *rx, struct lan966x_rx_dcb *dcb, u64 nextptr) @@ -116,6 +127,12 @@ static int lan966x_fdma_rx_alloc(struct lan966x_rx *rx) return 0; } +static void lan966x_fdma_rx_advance_dcb(struct lan966x_rx *rx) +{ + rx->dcb_index++; + rx->dcb_index &= FDMA_DCB_MAX - 1; +} + static void lan966x_fdma_rx_free(struct lan966x_rx *rx) { struct lan966x *lan966x = rx->lan966x; @@ -403,38 +420,53 @@ static bool lan966x_fdma_rx_more_frames(struct lan966x_rx *rx) return true; } -static struct sk_buff *lan966x_fdma_rx_get_frame(struct lan966x_rx *rx) +static int lan966x_fdma_rx_check_frame(struct lan966x_rx *rx, u64 *src_port) { struct lan966x *lan966x = rx->lan966x; - u64 src_port, timestamp; struct lan966x_db *db; - struct sk_buff *skb; struct page *page; - /* Get the received frame and unmap it */ db = &rx->dcbs[rx->dcb_index].db[rx->db_index]; page = rx->page[rx->dcb_index][rx->db_index]; + if (unlikely(!page)) + return FDMA_ERROR; dma_sync_single_for_cpu(lan966x->dev, (dma_addr_t)db->dataptr, FDMA_DCB_STATUS_BLOCKL(db->status), DMA_FROM_DEVICE); + dma_unmap_single_attrs(lan966x->dev, (dma_addr_t)db->dataptr, + PAGE_SIZE << rx->page_order, DMA_FROM_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + + lan966x_ifh_get_src_port(page_address(page), src_port); + if (WARN_ON(*src_port >= lan966x->num_phys_ports)) + return FDMA_ERROR; + + return FDMA_PASS; +} + +static struct sk_buff *lan966x_fdma_rx_get_frame(struct lan966x_rx *rx, + u64 src_port) +{ + struct lan966x *lan966x = rx->lan966x; + struct lan966x_db *db; + struct sk_buff *skb; + struct page *page; + u64 timestamp; + + /* Get the received frame and unmap it */ + db = &rx->dcbs[rx->dcb_index].db[rx->db_index]; + page = rx->page[rx->dcb_index][rx->db_index]; + skb = build_skb(page_address(page), PAGE_SIZE << rx->page_order); if (unlikely(!skb)) - goto unmap_page; + goto free_page; skb_put(skb, FDMA_DCB_STATUS_BLOCKL(db->status)); - lan966x_ifh_get_src_port(skb->data, &src_port); lan966x_ifh_get_timestamp(skb->data, ×tamp); - if (WARN_ON(src_port >= lan966x->num_phys_ports)) - goto free_skb; - - dma_unmap_single_attrs(lan966x->dev, (dma_addr_t)db->dataptr, - PAGE_SIZE << rx->page_order, DMA_FROM_DEVICE, - DMA_ATTR_SKIP_CPU_SYNC); - skb->dev = lan966x->ports[src_port]->dev; skb_pull(skb, IFH_LEN_BYTES); @@ -457,12 +489,7 @@ static struct sk_buff *lan966x_fdma_rx_get_frame(struct lan966x_rx *rx) return skb; -free_skb: - kfree_skb(skb); -unmap_page: - dma_unmap_single_attrs(lan966x->dev, (dma_addr_t)db->dataptr, - PAGE_SIZE << rx->page_order, DMA_FROM_DEVICE, - DMA_ATTR_SKIP_CPU_SYNC); +free_page: __free_pages(page, rx->page_order); return NULL; @@ -478,6 +505,7 @@ static int lan966x_fdma_napi_poll(struct napi_struct *napi, int weight) struct sk_buff *skb; struct page *page; int counter = 0; + u64 src_port; u64 nextptr; lan966x_fdma_tx_clear_buf(lan966x, weight); @@ -487,19 +515,26 @@ static int lan966x_fdma_napi_poll(struct napi_struct *napi, int weight) if (!lan966x_fdma_rx_more_frames(rx)) break; - skb = lan966x_fdma_rx_get_frame(rx); + counter++; - rx->page[rx->dcb_index][rx->db_index] = NULL; - rx->dcb_index++; - rx->dcb_index &= FDMA_DCB_MAX - 1; + switch (lan966x_fdma_rx_check_frame(rx, &src_port)) { + case FDMA_PASS: + break; + case FDMA_ERROR: + lan966x_fdma_rx_free_page(rx); + lan966x_fdma_rx_advance_dcb(rx); + goto allocate_new; + } + skb = lan966x_fdma_rx_get_frame(rx, src_port); + lan966x_fdma_rx_advance_dcb(rx); if (!skb) - break; + goto allocate_new; napi_gro_receive(&lan966x->napi, skb); - counter++; } +allocate_new: /* Allocate new pages and map them */ while (dcb_reload != rx->dcb_index) { db = &rx->dcbs[dcb_reload].db[rx->db_index]; diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h index 4ec33999e4df6..464fb5e4a8ff6 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h @@ -100,6 +100,15 @@ enum macaccess_entry_type { ENTRYTYPE_MACV6, }; +/* FDMA return action codes for checking if the frame is valid + * FDMA_PASS, frame is valid and can be used + * FDMA_ERROR, something went wrong, stop getting more frames + */ +enum lan966x_fdma_action { + FDMA_PASS = 0, + FDMA_ERROR, +}; + struct lan966x_port; struct lan966x_db {