Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753096AbdHZBeC (ORCPT ); Fri, 25 Aug 2017 21:34:02 -0400 Received: from mail-wr0-f194.google.com ([209.85.128.194]:35188 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751411AbdHZBeA (ORCPT ); Fri, 25 Aug 2017 21:34:00 -0400 From: Florian Fainelli To: netdev@vger.kernel.org Cc: edumazet@gmail.com, davem@davemloft.net, Florian Fainelli , Jeff Kirsher , intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net-next v3] e1000e: Be drop monitor friendly Date: Fri, 25 Aug 2017 18:14:24 -0700 Message-Id: <20170826011424.27251-1-f.fainelli@gmail.com> X-Mailer: git-send-email 2.9.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3177 Lines: 94 e1000e_put_txbuf() can be called from normal reclamation path as well as when a DMA mapping failure, so we need to differentiate these two cases when freeing SKBs to be drop monitor friendly. e1000e_tx_hwtstamp_work() and e1000_remove() are processing TX timestamped SKBs and those should not be accounted as drops either. Signed-off-by: Florian Fainelli --- Changes in v3: - differentiate normal reclamation from TX DMA fragment mapping errors - removed a few invalid dev_kfree_skb() replacements (those are already drop monitor friendly) Changes in v2: - make it compile drivers/net/ethernet/intel/e1000e/netdev.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 327dfe5bedc0..cfd21858c095 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -1071,7 +1071,8 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done, } static void e1000_put_txbuf(struct e1000_ring *tx_ring, - struct e1000_buffer *buffer_info) + struct e1000_buffer *buffer_info, + bool drop) { struct e1000_adapter *adapter = tx_ring->adapter; @@ -1085,7 +1086,10 @@ static void e1000_put_txbuf(struct e1000_ring *tx_ring, buffer_info->dma = 0; } if (buffer_info->skb) { - dev_kfree_skb_any(buffer_info->skb); + if (drop) + dev_kfree_skb_any(buffer_info->skb); + else + dev_consume_skb_any(buffer_info->skb); buffer_info->skb = NULL; } buffer_info->time_stamp = 0; @@ -1199,7 +1203,7 @@ static void e1000e_tx_hwtstamp_work(struct work_struct *work) wmb(); /* force write prior to skb_tstamp_tx */ skb_tstamp_tx(skb, &shhwtstamps); - dev_kfree_skb_any(skb); + dev_consume_skb_any(skb); } else if (time_after(jiffies, adapter->tx_hwtstamp_start + adapter->tx_timeout_factor * HZ)) { dev_kfree_skb_any(adapter->tx_hwtstamp_skb); @@ -1254,7 +1258,7 @@ static bool e1000_clean_tx_irq(struct e1000_ring *tx_ring) } } - e1000_put_txbuf(tx_ring, buffer_info); + e1000_put_txbuf(tx_ring, buffer_info, false); tx_desc->upper.data = 0; i++; @@ -2421,7 +2425,7 @@ static void e1000_clean_tx_ring(struct e1000_ring *tx_ring) for (i = 0; i < tx_ring->count; i++) { buffer_info = &tx_ring->buffer_info[i]; - e1000_put_txbuf(tx_ring, buffer_info); + e1000_put_txbuf(tx_ring, buffer_info, false); } netdev_reset_queue(adapter->netdev); @@ -5614,7 +5618,7 @@ static int e1000_tx_map(struct e1000_ring *tx_ring, struct sk_buff *skb, i += tx_ring->count; i--; buffer_info = &tx_ring->buffer_info[i]; - e1000_put_txbuf(tx_ring, buffer_info); + e1000_put_txbuf(tx_ring, buffer_info, true); } return 0; @@ -7411,7 +7415,7 @@ static void e1000_remove(struct pci_dev *pdev) if (adapter->flags & FLAG_HAS_HW_TIMESTAMP) { cancel_work_sync(&adapter->tx_hwtstamp_work); if (adapter->tx_hwtstamp_skb) { - dev_kfree_skb_any(adapter->tx_hwtstamp_skb); + dev_consume_skb_any(adapter->tx_hwtstamp_skb); adapter->tx_hwtstamp_skb = NULL; } } -- 2.9.3