From patchwork Mon Oct 3 09:32:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 12997400 X-Patchwork-Delegate: nbd@nbd.name 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 82394C433F5 for ; Mon, 3 Oct 2022 09:46:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229956AbiJCJqR (ORCPT ); Mon, 3 Oct 2022 05:46:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229953AbiJCJpz (ORCPT ); Mon, 3 Oct 2022 05:45:55 -0400 Received: from nbd.name (nbd.name [46.4.11.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D19BE52820 for ; Mon, 3 Oct 2022 02:43:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Sender:Reply-To:Cc:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=s0uRK9re9MEqKxFEzmqpwuLwIGA3bf7xCrXNAQx29PA=; b=F9fcRPaIHyXewg1SpHOQGQhJ2R qumIWgVJUcTDzG+dbYw5gYAxw7Pt1JuXQqIeXxlfvq2KAmnC4psvYkBXlNeFnHYnraDzXvJBY5tNL XLHT85TeLDaiJyMmkLb5Qzxur7n0NjfE4FMdMSPZP3jdwJhHI2VAEKJgXJIqWBNNB6t4=; Received: from p200300daa7301d00d4086823c46c59c0.dip0.t-ipconnect.de ([2003:da:a730:1d00:d408:6823:c46c:59c0] helo=Maecks.lan) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (Exim 4.94.2) (envelope-from ) id 1ofHnz-009qu9-6J for linux-wireless@vger.kernel.org; Mon, 03 Oct 2022 11:32:07 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 2/4] wifi: mt76: dma: add support for mapping skb fragments Date: Mon, 3 Oct 2022 11:32:04 +0200 Message-Id: <20221003093206.86323-2-nbd@nbd.name> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221003093206.86323-1-nbd@nbd.name> References: <20221003093206.86323-1-nbd@nbd.name> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Only supported for skbs without frag_list. This is needed to support scatter/gather for packets on WLAN devices with A-MSDU offload Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/dma.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c index 4901aa02b4fb..ceb63b3aaced 100644 --- a/drivers/net/wireless/mediatek/mt76/dma.c +++ b/drivers/net/wireless/mediatek/mt76/dma.c @@ -359,12 +359,17 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, .skb = skb, }; struct ieee80211_hw *hw; - int len, n = 0, ret = -ENOMEM; + int len, i, n = 0, ret = -ENOMEM; struct mt76_txwi_cache *t; struct sk_buff *iter; dma_addr_t addr; u8 *txwi; + if (skb_shinfo(skb)->nr_frags && + skb_shinfo(skb)->nr_frags + 1 > dev->hw->max_tx_fragments && + skb_linearize(skb)) + goto free_skb; + t = mt76_get_txwi(dev); if (!t) goto free_skb; @@ -385,6 +390,22 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, tx_info.buf[n].addr = addr; tx_info.buf[n++].len = len; + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + if (n == ARRAY_SIZE(tx_info.buf)) + goto unmap; + + len = skb_frag_size(frag); + addr = skb_frag_dma_map(dev->dma_dev, frag, 0, len, + DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(dev->dma_dev, addr))) + goto unmap; + + tx_info.buf[n].addr = addr; + tx_info.buf[n++].len = len; + } + skb_walk_frags(skb, iter) { if (n == ARRAY_SIZE(tx_info.buf)) goto unmap;