From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wang Xiao W Subject: [PATCH 06/28] fm10k: reset head instead of calling update_max_size Date: Thu, 10 Sep 2015 12:38:15 +0800 Message-ID: <1441859917-26475-7-git-send-email-xiao.w.wang@intel.com> References: <1441859917-26475-1-git-send-email-xiao.w.wang@intel.com> Cc: Wang Xiao W To: dev@dpdk.org Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id D083F8E81 for ; Thu, 10 Sep 2015 06:38:59 +0200 (CEST) In-Reply-To: <1441859917-26475-1-git-send-email-xiao.w.wang@intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" After shutting down the mailbox by force, we then go about resetting max size to 0, and clearing all messages in the FIFO. However, we should just reset the head pointer so that the FIFO will become empty, rather than changing the max size to 0. This helps prevent increment in tx_dropped counter during mailbox negotiation, which is confusing to viewers of Linux ethtool statistics output. Signed-off-by: Wang Xiao W --- drivers/net/fm10k/base/fm10k_mbx.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/net/fm10k/base/fm10k_mbx.c b/drivers/net/fm10k/base/fm10k_mbx.c index e6cf1c8..12f10f8 100644 --- a/drivers/net/fm10k/base/fm10k_mbx.c +++ b/drivers/net/fm10k/base/fm10k_mbx.c @@ -139,6 +139,18 @@ STATIC u16 fm10k_fifo_head_drop(struct fm10k_mbx_fifo *fifo) } /** + * fm10k_fifo_drop_all - Drop all messages in FIFO + * @fifo: pointer to FIFO + * + * This function resets the head pointer to drop all messages in the FIFO, + * and ensure the FIFO is empty. + **/ +STATIC void fm10k_fifo_drop_all(struct fm10k_mbx_fifo *fifo) +{ + fifo->head = fifo->tail; +} + +/** * fm10k_mbx_index_len - Convert a head/tail index into a length value * @mbx: pointer to mailbox * @head: head index @@ -1407,9 +1419,11 @@ STATIC void fm10k_mbx_disconnect(struct fm10k_hw *hw, timeout -= FM10K_MBX_POLL_DELAY; } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED)); - /* in case we didn't close just force the mailbox into shutdown */ + /* in case we didn't close, just force the mailbox into shutdown and + * drop all left over messages in the FIFO. + */ fm10k_mbx_connect_reset(mbx); - fm10k_mbx_update_max_size(mbx, 0); + fm10k_fifo_drop_all(&mbx->tx); FM10K_WRITE_MBX(hw, mbx->mbmem_reg, 0); } -- 1.9.3