From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A607511E9B; Wed, 30 Sep 2026 16:41:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786476; cv=none; b=awY+hE0TOQItWG0UGmdX6s8mSjxnIIBUwYGSnoAtdUCHBVfbHdcxziTnvV4OH/HSDtfE9uD9lEldDz7uFQsKsduIT24GNV2Rvg3IePseRCduP61hFloKjlGf9XnBb5amgCq+xNm8OSKMSUF93f8Usm5w0WKlU9uJJTxkP+2FIAs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786476; c=relaxed/simple; bh=egZ2EmrJ+KowUHlptcsIPKX1k3PUIQO9uUqgEM7cFfg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=USbsNcLbMkqQgDCsFyQ80lmVcZQYseNFUVo2DWy8a5eZQrFfLrxbXtUl3GgXCZkT097GPpNrhbg8cjuSusTjNT+ZVQnd5P8ABxN+mtSyHddDSL/H5xUn4fJhj6O692SkGcYG8GAg6HBtupAx9jBrbUSm+OHftPGwYZo077o7du8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=crA4l8GI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="crA4l8GI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F0BC1F000FF; Wed, 30 Sep 2026 16:41:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790786475; bh=Ybl8dhHGohArxEO8ufFv/B9bHHQCTptmflqMHqAXEwI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=crA4l8GIRXQZCbqucD/YGgQfE54PIfrKGlVilXNAPH1fcY0RwKEClEL9ZuMm82A6H 5qIDocdzPAPMB+YTG1iCJyYly1wSnUThaMK/oHDqHBkf6v997Q1UqHIlIdjoHogtUH ktFQsNDYq38Q9UaefYfP0TusMkpdJ6BaqzVHM8tk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Maxime Chevallier , Nicolai Buchwitz , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1 873/982] net: stmmac: dwmac4: Use the correct bufzise when the len is exactly 8K Date: Wed, 30 Sep 2026 17:26:49 +0200 Message-ID: <20260930152435.504173328@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maxime Chevallier [ Upstream commit b42e7012773a0e81e97a2dda6ef907f5147a6658 ] DMA bufsize selection isn't made on the MTU but the actual frame length, so including the L2 header. On DWMAC4, if the len is exactly BUF_SIZE_8KiB, the next larger size is incorrectly selected. Lets fix the comparison and while at it, rename the parameter from len to mtu. Fixes: c3efed5ad1b0 ("net: stmmac: Enable dwmac4 jumbo frame more than 8KiB"). Signed-off-by: Maxime Chevallier Reviewed-by: Nicolai Buchwitz Link: https://patch.msgid.link/20260917215339.2022523-6-maxime.chevallier@bootlin.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c | 4 ++-- drivers/net/ethernet/stmicro/stmmac/hwif.h | 2 +- drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c index 89a14084c6117..db47c8f6093c6 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c @@ -477,11 +477,11 @@ static void dwmac4_set_sarc(struct dma_desc *p, u32 sarc_type) p->des3 |= cpu_to_le32(sarc_type & TDES3_SA_INSERT_CTRL_MASK); } -static int set_16kib_bfsize(int mtu) +static int set_16kib_bfsize(int len) { int ret = 0; - if (unlikely(mtu >= BUF_SIZE_8KiB)) + if (unlikely(len > BUF_SIZE_8KiB)) ret = BUF_SIZE_16KiB; return ret; } diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h index 19424af936d2b..c4fe5c3f3de39 100644 --- a/drivers/net/ethernet/stmicro/stmmac/hwif.h +++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h @@ -565,7 +565,7 @@ struct stmmac_mode_ops { unsigned int (*is_jumbo_frm) (int len, int ehn_desc); int (*jumbo_frm)(struct stmmac_tx_queue *tx_q, struct sk_buff *skb, int csum); - int (*set_16kib_bfsize)(int mtu); + int (*set_16kib_bfsize)(int len); void (*init_desc3)(struct dma_desc *p); void (*refill_desc3)(struct stmmac_rx_queue *rx_q, struct dma_desc *p); void (*clean_desc3)(struct stmmac_tx_queue *tx_q, struct dma_desc *p); diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c index 45c14c1bb0eaa..88a8d22812f5d 100644 --- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c @@ -128,10 +128,10 @@ static void clean_desc3(struct stmmac_tx_queue *tx_q, struct dma_desc *p) p->des3 = 0; } -static int set_16kib_bfsize(int mtu) +static int set_16kib_bfsize(int len) { int ret = 0; - if (unlikely(mtu > BUF_SIZE_8KiB)) + if (unlikely(len > BUF_SIZE_8KiB)) ret = BUF_SIZE_16KiB; return ret; } -- 2.53.0