From patchwork Tue Oct 29 12:17:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13854916 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DEAB3D2AB3B for ; Tue, 29 Oct 2024 13:04:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GGBrW6s1iDZGgAw1vKKsS6IoQiQB5AZQ9VznYANSAto=; b=e3w+RgzPBUtqoIGxgcPm5TF5mw 3YGPhjyYzPW244guFfg4hz4tGioSd/UaIdsrbODOv7yNJR/m61LS5q/EWwitjlcTDty6fGjw9IepR JXi26ULZ3IupVvfLNr+id4wcCD4LnxWoWalZrle2EPVWQzXldDzIi6IiGKTo+FC+CaUfo7u3fOp3n bgH9fPAA8q9IlZusT2SqMVbBEgbNrB61L245azrWBT7U0a19keP2QDpwpg91XeAIJEwp6RnDsiy67 /e5N1j8SWvvJgoPR66gLwWh3lPTBJy38qDsY9l242Jk0nMPCQpDIkoY8W1pzCT1TXAF+t9J8kHbmN aQynW2+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t5ltu-0000000EVxH-0d08; Tue, 29 Oct 2024 13:04:46 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t5lAN-0000000ENeI-1zty; Tue, 29 Oct 2024 12:17:44 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E56125C5C81; Tue, 29 Oct 2024 12:16:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FA1DC4CECD; Tue, 29 Oct 2024 12:17:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730204262; bh=tDkCaSGHNwLmvBZ1sIOYlpYZET0YJNWlUhpzReHjttw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Ce2LSR3SW+LRk8THt1OeL4bpr+mNwqDl0mPzdmsISqGfIPtUBe83bur1Ygs9dJ35w gx7NWDaEaKeESZzZkQ6ceNbW8LH4F7CM8EVuuvqXEg8mYx56v7TyktNXWbNA+RNJD+ UCbD7hvACBiZs/27X7JKPOnKPmlK4Fo4HWGoMmV88DbK0vkfGhLU6XmMIjh9ugU1Y2 UOjHMRMTrHnj0cK8pmjYH+jO2UK+iSQRor3dhhpeG7TRcLCwIeXsSUEL2bcHOZlIMB JidWfF7VevZwn89oYrl0wFKIeuWx740m7iSZOUlq0c7Bjyd3SSfuMUc3dgqfkCUIWH CcjSTnP6TlpWw== From: Lorenzo Bianconi Date: Tue, 29 Oct 2024 13:17:10 +0100 Subject: [PATCH net-next 2/2] net: airoha: Simplify Tx napi logic MIME-Version: 1.0 Message-Id: <20241029-airoha-en7581-tx-napi-work-v1-2-96ad1686b946@kernel.org> References: <20241029-airoha-en7581-tx-napi-work-v1-0-96ad1686b946@kernel.org> In-Reply-To: <20241029-airoha-en7581-tx-napi-work-v1-0-96ad1686b946@kernel.org> To: Felix Fietkau , Sean Wang , Mark Lee , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Matthias Brugger , AngeloGioacchino Del Regno Cc: linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, netdev@vger.kernel.org, Lorenzo Bianconi X-Mailer: b4 0.14.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241029_051743_638148_B6EE01FD X-CRM114-Status: GOOD ( 15.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Simplify Tx napi logic relying just on the packet index provided by completion queue indicating the completed packet that can be removed from the Tx DMA ring. This is a preliminary patch to add Qdisc offload for airoha_eth driver. Signed-off-by: Lorenzo Bianconi --- drivers/net/ethernet/mediatek/airoha_eth.c | 73 +++++++++++++++++------------- 1 file changed, 41 insertions(+), 32 deletions(-) diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c index 6cd8901ed38f0640a8a8f72174c120668b364045..6c683a12d5aa52dd9d966df123509075a989c0b3 100644 --- a/drivers/net/ethernet/mediatek/airoha_eth.c +++ b/drivers/net/ethernet/mediatek/airoha_eth.c @@ -1670,8 +1670,12 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget) irq_queued = FIELD_GET(IRQ_ENTRY_LEN_MASK, status); while (irq_queued > 0 && done < budget) { - u32 qid, last, val = irq_q->q[head]; + u32 qid, val = irq_q->q[head]; + struct airoha_qdma_desc *desc; + struct airoha_queue_entry *e; struct airoha_queue *q; + u32 index, desc_ctrl; + struct sk_buff *skb; if (val == 0xff) break; @@ -1681,9 +1685,7 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget) irq_queued--; done++; - last = FIELD_GET(IRQ_DESC_IDX_MASK, val); qid = FIELD_GET(IRQ_RING_IDX_MASK, val); - if (qid >= ARRAY_SIZE(qdma->q_tx)) continue; @@ -1691,46 +1693,53 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget) if (!q->ndesc) continue; + index = FIELD_GET(IRQ_DESC_IDX_MASK, val); + if (index >= q->ndesc) + continue; + spin_lock_bh(&q->lock); - while (q->queued > 0) { - struct airoha_qdma_desc *desc = &q->desc[q->tail]; - struct airoha_queue_entry *e = &q->entry[q->tail]; - u32 desc_ctrl = le32_to_cpu(desc->ctrl); - struct sk_buff *skb = e->skb; - u16 index = q->tail; + if (!q->queued) + goto unlock; - if (!(desc_ctrl & QDMA_DESC_DONE_MASK) && - !(desc_ctrl & QDMA_DESC_DROP_MASK)) - break; + desc = &q->desc[index]; + desc_ctrl = le32_to_cpu(desc->ctrl); - q->tail = (q->tail + 1) % q->ndesc; - q->queued--; + if (!(desc_ctrl & QDMA_DESC_DONE_MASK) && + !(desc_ctrl & QDMA_DESC_DROP_MASK)) + goto unlock; - dma_unmap_single(eth->dev, e->dma_addr, e->dma_len, - DMA_TO_DEVICE); + e = &q->entry[index]; + skb = e->skb; - WRITE_ONCE(desc->msg0, 0); - WRITE_ONCE(desc->msg1, 0); + dma_unmap_single(eth->dev, e->dma_addr, e->dma_len, + DMA_TO_DEVICE); + memset(e, 0, sizeof(*e)); + WRITE_ONCE(desc->msg0, 0); + WRITE_ONCE(desc->msg1, 0); + q->queued--; - if (skb) { - u16 queue = skb_get_queue_mapping(skb); - struct netdev_queue *txq; + /* completion ring can report out-of-order indexes if hw QoS + * is enabled and packets with different priority are queued + * to same DMA ring. Take into account possible out-of-order + * reports incrementing DMA ring tail pointer + */ + while (q->tail != q->head && !q->entry[q->tail].dma_addr) + q->tail = (q->tail + 1) % q->ndesc; - txq = netdev_get_tx_queue(skb->dev, queue); - netdev_tx_completed_queue(txq, 1, skb->len); - if (netif_tx_queue_stopped(txq) && - q->ndesc - q->queued >= q->free_thr) - netif_tx_wake_queue(txq); + if (skb) { + u16 queue = skb_get_queue_mapping(skb); + struct netdev_queue *txq; - dev_kfree_skb_any(skb); - e->skb = NULL; - } + txq = netdev_get_tx_queue(skb->dev, queue); + netdev_tx_completed_queue(txq, 1, skb->len); + if (netif_tx_queue_stopped(txq) && + q->ndesc - q->queued >= q->free_thr) + netif_tx_wake_queue(txq); - if (index == last) - break; + dev_kfree_skb_any(skb); } - +unlock: spin_unlock_bh(&q->lock); }