From mboxrd@z Thu Jan 1 00:00:00 1970 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 7AB82C433FE for ; Sun, 13 Mar 2022 08:36:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233970AbiCMIh4 (ORCPT ); Sun, 13 Mar 2022 04:37:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233898AbiCMIhy (ORCPT ); Sun, 13 Mar 2022 04:37:54 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FE061AC2AE for ; Sun, 13 Mar 2022 00:36:46 -0800 (PST) Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nTJiW-00073j-G7 for linux-can@vger.kernel.org; Sun, 13 Mar 2022 09:36:44 +0100 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 756BA49AAF for ; Sun, 13 Mar 2022 08:36:41 +0000 (UTC) Received: from hardanger.blackshift.org (unknown [172.20.34.65]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by bjornoya.blackshift.org (Postfix) with ESMTPS id 2805149A87; Sun, 13 Mar 2022 08:36:41 +0000 (UTC) Received: from blackshift.org (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id 73d14c9d; Sun, 13 Mar 2022 08:36:40 +0000 (UTC) From: Marc Kleine-Budde To: linux-can@vger.kernel.org Cc: kernel@pengutronix.de, Manivannan Sadhasivam , Thomas Kopp , Marc Kleine-Budde Subject: [can-next-rfc 05/12] can: mcp251xfd: ring: prepare support for runtime configurable RX/TX ring parameters Date: Sun, 13 Mar 2022 09:36:33 +0100 Message-Id: <20220313083640.501791-6-mkl@pengutronix.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220313083640.501791-1-mkl@pengutronix.de> References: <20220313083640.501791-1-mkl@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-can@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org This patch prepares the driver for runtime configurable RX and TX ring parameters. The actual runtime config support will be added in the next patch. Signed-off-by: Marc Kleine-Budde --- .../net/can/spi/mcp251xfd/mcp251xfd-ring.c | 26 ++++++++----------- drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 2 ++ 2 files changed, 13 insertions(+), 15 deletions(-) diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c index e540c97b4160..0e78941601bf 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c @@ -289,9 +289,9 @@ int mcp251xfd_ring_alloc(struct mcp251xfd_priv *priv) { struct mcp251xfd_tx_ring *tx_ring; struct mcp251xfd_rx_ring *rx_ring; - int tef_obj_size, tx_obj_size, rx_obj_size; - int tx_obj_num; - int ram_free, i; + u8 tef_obj_size, tx_obj_size, rx_obj_size; + u8 tx_obj_num; + u8 rem, i; tef_obj_size = sizeof(struct mcp251xfd_hw_tef_obj); if (mcp251xfd_is_fd_mode(priv)) { @@ -310,17 +310,14 @@ int mcp251xfd_ring_alloc(struct mcp251xfd_priv *priv) tx_ring->obj_num = tx_obj_num; tx_ring->obj_size = tx_obj_size; - ram_free = MCP251XFD_RAM_SIZE - tx_obj_num * - (tef_obj_size + tx_obj_size); + rem = (MCP251XFD_RAM_SIZE - tx_obj_num * + (tef_obj_size + tx_obj_size)) / rx_obj_size; + for (i = 0; i < ARRAY_SIZE(priv->rx) && rem; i++) { + u8 rx_obj_num; - for (i = 0; - i < ARRAY_SIZE(priv->rx) && ram_free >= rx_obj_size; - i++) { - int rx_obj_num; - - rx_obj_num = ram_free / rx_obj_size; - rx_obj_num = min(1 << (fls(rx_obj_num) - 1), - MCP251XFD_RX_OBJ_NUM_MAX); + rx_obj_num = min_t(u8, rounddown_pow_of_two(rem), + MCP251XFD_FIFO_DEPTH); + rem -= rx_obj_num; priv->rx_obj_num += rx_obj_num; @@ -330,11 +327,10 @@ int mcp251xfd_ring_alloc(struct mcp251xfd_priv *priv) mcp251xfd_ring_free(priv); return -ENOMEM; } + rx_ring->obj_num = rx_obj_num; rx_ring->obj_size = rx_obj_size; priv->rx[i] = rx_ring; - - ram_free -= rx_ring->obj_num * rx_ring->obj_size; } priv->rx_ring_num = i; diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h index 5c7a672464b1..bd7a9999b5e3 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h @@ -415,6 +415,8 @@ static_assert(MCP251XFD_TIMESTAMP_WORK_DELAY_SEC < #define MCP251XFD_FIFO_RX_NUM_MAX 1U #define MCP251XFD_FIFO_TX_NUM 1U +#define MCP251XFD_FIFO_DEPTH 32U + static_assert(MCP251XFD_FIFO_TEF_NUM == 1U); static_assert(MCP251XFD_FIFO_TEF_NUM == MCP251XFD_FIFO_TX_NUM); static_assert(MCP251XFD_FIFO_RX_NUM_MAX <= 4U); -- 2.35.1