From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from codeconstruct.com.au (pi.codeconstruct.com.au [203.29.241.158]) (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 4582636A35A; Wed, 8 Jul 2026 09:58:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.29.241.158 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783504737; cv=none; b=Ip68JvGDtruit1G8bdd0UfsDsV2S3J+qM4cHyzvHVho4R5z5xOUdL6xhM3/z14HGq9lEjmHpjqdT52jDRjtjptOWiUHOAfFRVRkndEJHLgpxrRLBXu1Ln+1V0n0DK+WHpsPAM9fpGk1m4m831hLDaNnT50s4yirOlKo7VEIrb0M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783504737; c=relaxed/simple; bh=/2Ier6FRdzjPO3Emli1gXM2xVhA3IkF3e6eshK4zg2E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=O/y4+NBYSZlcJCbGVcck7UPpEadYKwqpG9++i5J+hEJ5RF54eLIuxkKDCYohdCADY5fjAyAkJ2jg2DSxXPz0kO2kZjh78ODia0+XCv3S+1dr5ex+4569u57232gMAvTRaGl5xkYfppS15n60q6eK7mgYL+0VWcyL0+KnClQb9rM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au; spf=pass smtp.mailfrom=codeconstruct.com.au; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b=N7Je1sR9; arc=none smtp.client-ip=203.29.241.158 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b="N7Je1sR9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codeconstruct.com.au; s=2022a; t=1783504728; bh=bjKgiEdKsT7lRbJrX1xrLVJ5yD4EUl26YxZG1ln3Jpw=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=N7Je1sR9pyDf5rKYd29RBhwUS4LFE+MarUzAKGjhRrga4jp6Lx544IuhlYgjOLKFx wl2LvOLxFWgR73jxeO2izbX91mMfLvP8OtSsD4uQKtMQmZywUK9ZqSaiV0uOpTyccu vjAkrK5DASDsuwBCBuGtuSiRRKqbsY3WekZg9YU11rUgBG3hNNFAlB7qcgWqE8JcXJ s8WZXFpS26xIuADmOqKIl46xQXw+omujaWB5KjwCb78TJWDki2HrnK+7R9DiAr24eG ThQz6deaQW/Gq0k1f9oHxCCbWbbfwzz6TmD7xKzjU+zw8cVD3lG+tf4BNLKTZ7uTwT XmQ0v+c8LflRQ== Received: by codeconstruct.com.au (Postfix, from userid 10000) id 35F8D6654B; Wed, 8 Jul 2026 17:58:48 +0800 (AWST) From: Jeremy Kerr Date: Wed, 08 Jul 2026 17:58:32 +0800 Subject: [PATCH net-next v3 01/12] net: mctp: usb: Include version indicator in max packet size defines Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260708-dev-mctp-usb-1-1-v3-1-9e710155cdbf@codeconstruct.com.au> References: <20260708-dev-mctp-usb-1-1-v3-0-9e710155cdbf@codeconstruct.com.au> In-Reply-To: <20260708-dev-mctp-usb-1-1-v3-0-9e710155cdbf@codeconstruct.com.au> To: Matt Johnston , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Greg Kroah-Hartman Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org X-Mailer: b4 0.16-dev DSP0283 v1.1.0 will introduce larger maximum packet sizes. In preparation, indicate that the current maxima are specific to v1.0.x. Signed-off-by: Jeremy Kerr --- drivers/net/mctp/mctp-usb.c | 8 ++++---- include/linux/usb/mctp-usb.h | 5 +++-- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/net/mctp/mctp-usb.c b/drivers/net/mctp/mctp-usb.c index fade65f2f269..545eff06322c 100644 --- a/drivers/net/mctp/mctp-usb.c +++ b/drivers/net/mctp/mctp-usb.c @@ -76,7 +76,7 @@ static netdev_tx_t mctp_usb_start_xmit(struct sk_buff *skb, plen = skb->len; - if (plen + sizeof(*hdr) > MCTP_USB_XFER_SIZE) + if (plen + sizeof(*hdr) > MCTP_USB_1_0_XFER_SIZE) goto err_drop; rc = skb_cow_head(skb, sizeof(*hdr)); @@ -128,7 +128,7 @@ static int mctp_usb_rx_queue(struct mctp_usb *mctp_usb, gfp_t gfp) struct sk_buff *skb; int rc; - skb = __netdev_alloc_skb(mctp_usb->netdev, MCTP_USB_XFER_SIZE, gfp); + skb = __netdev_alloc_skb(mctp_usb->netdev, MCTP_USB_1_0_XFER_SIZE, gfp); if (!skb) { rc = -ENOMEM; goto err_retry; @@ -136,7 +136,7 @@ static int mctp_usb_rx_queue(struct mctp_usb *mctp_usb, gfp_t gfp) usb_fill_bulk_urb(mctp_usb->rx_urb, mctp_usb->usbdev, usb_rcvbulkpipe(mctp_usb->usbdev, mctp_usb->ep_in), - skb->data, MCTP_USB_XFER_SIZE, + skb->data, MCTP_USB_1_0_XFER_SIZE, mctp_usb_in_complete, skb); rc = usb_submit_urb(mctp_usb->rx_urb, gfp); @@ -301,7 +301,7 @@ static void mctp_usb_netdev_setup(struct net_device *dev) dev->mtu = MCTP_USB_MTU_MIN; dev->min_mtu = MCTP_USB_MTU_MIN; - dev->max_mtu = MCTP_USB_MTU_MAX; + dev->max_mtu = MCTP_USB_1_0_MTU_MAX; dev->hard_header_len = sizeof(struct mctp_usb_hdr); dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; diff --git a/include/linux/usb/mctp-usb.h b/include/linux/usb/mctp-usb.h index a2f6f1e04efb..47e2e3931d63 100644 --- a/include/linux/usb/mctp-usb.h +++ b/include/linux/usb/mctp-usb.h @@ -21,10 +21,11 @@ struct mctp_usb_hdr { u8 len; } __packed; -#define MCTP_USB_XFER_SIZE 512 +/* max transfer size for DSP0283 v1.0 */ +#define MCTP_USB_1_0_XFER_SIZE 512 #define MCTP_USB_BTU 68 #define MCTP_USB_MTU_MIN MCTP_USB_BTU -#define MCTP_USB_MTU_MAX (U8_MAX - sizeof(struct mctp_usb_hdr)) +#define MCTP_USB_1_0_MTU_MAX (U8_MAX - sizeof(struct mctp_usb_hdr)) #define MCTP_USB_DMTF_ID 0x1ab4 #endif /* __LINUX_USB_MCTP_USB_H */ -- 2.47.3