From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Date: Mon, 23 Jan 2017 08:57:55 -0800 Subject: [Intel-wired-lan] [next PATCH v3 0/9] igb: Add support for writable pages and build_skb Message-ID: <20170123165647.13402.1254.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: This patch set enables support for using the recent changes that allow for unmapping pages without invalidating their contents via DMA_ATTR_SKIP_CPU_SYNC. With this change DMA pages should be writable and as a result we should be able to make use of build_skb which can be used to drop the skb->head memory allocation, header parsing, and memcpy from the receive path which can greatly help to improve performance. My main concern at this point is that there might be an architecture where I didn't get DMA_ATTR_SKIP_CPU_SYNC implemented that might still need it. For that reason I have also added a ethtool private flag called out as "legacy-rx". If a platform encounters an issue where the Rx can possibly corrupt data it can be enbled by running: ethtool --set-priv-flags DEVNAME legacy-rx on The testing matrix for all of these patches is going to be pretty extensive. Basically we want to test these patches on as many platforms and architectures as possible with as many features being toggled as possible including SR-IOV and Jumbo Frames all while receiving traffic. Within the patches there is also some intialization changes. Specifically I have updated the code paths to defer clearing the rings until we are about to initialize them and give them to hardware. By doing this we are able to avoid having to dirty memory we don't need to which should help to improve suspend/resume times for when we start looking at possibly using the suspend/resume approach for migration of interface in VMs. v2: Minor fixes to address a few issues found in testing v3: Fix minor build issues reported by kbuild test robot --- Alexander Duyck (9): igb: Add support for DMA_ATTR_WEAK_ORDERING igb: Use length to determine if descriptor is done igb: Clear Rx buffer_info in configure instead of clean igb: Don't bother clearing Tx buffer_info in igb_clean_tx_ring igb: Limit maximum frame Rx based on MTU igb: Add support for padding packet igb: Add support for ethtool private flag to allow use of legacy Rx igb: Break out Rx buffer page management igb: Re-add support for build_skb in igb drivers/net/ethernet/intel/igb/igb.h | 58 +++ drivers/net/ethernet/intel/igb/igb_ethtool.c | 65 +++ drivers/net/ethernet/intel/igb/igb_main.c | 511 ++++++++++++++++---------- drivers/net/ethernet/intel/igb/igb_ptp.c | 3 4 files changed, 435 insertions(+), 202 deletions(-) --