From f0064bfd969bea0d65ef20d191bea8b7494b4ec8 Mon Sep 17 00:00:00 2001 From: Björn Töpel Date: Tue, 25 Aug 2020 13:35:55 +0200 Subject: i40e: use 16B HW descriptors instead of 32B MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The i40e NIC supports two flavors of HW descriptors, 16 and 32 byte. The latter has, obviously, room for more offloading information. However, the only fields of the 32B HW descriptor that is being used by the driver, is also available in the 16B descriptor. In other words; Reading and writing 32 bytes instead of 16 byte is a waste of bus bandwidth. This commit starts using 16 byte descriptors instead of 32 byte descriptors. For AF_XDP the rx_drop benchmark was improved by 2%. Signed-off-by: Björn Töpel Tested-by: Aaron Brown Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/net/ethernet/intel/i40e/i40e_debugfs.c') diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c index d3ad2e3aa838..d7c13ca9be7d 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c +++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c @@ -604,10 +604,9 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n, } else { rxd = I40E_RX_DESC(ring, i); dev_info(&pf->pdev->dev, - " d[%03x] = 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n", + " d[%03x] = 0x%016llx 0x%016llx\n", i, rxd->read.pkt_addr, - rxd->read.hdr_addr, - rxd->read.rsvd1, rxd->read.rsvd2); + rxd->read.hdr_addr); } } } else if (cnt == 3) { @@ -625,10 +624,9 @@ static void i40e_dbg_dump_desc(int cnt, int vsi_seid, int ring_id, int desc_n, } else { rxd = I40E_RX_DESC(ring, desc_n); dev_info(&pf->pdev->dev, - "vsi = %02i rx ring = %02i d[%03x] = 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n", + "vsi = %02i rx ring = %02i d[%03x] = 0x%016llx 0x%016llx\n", vsi_seid, ring_id, desc_n, - rxd->read.pkt_addr, rxd->read.hdr_addr, - rxd->read.rsvd1, rxd->read.rsvd2); + rxd->read.pkt_addr, rxd->read.hdr_addr); } } else { dev_info(&pf->pdev->dev, "dump desc rx/tx/xdp []\n"); -- cgit