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| author |   Alexander Duyck <alexander.h.duyck@intel.com> | 2017-03-14 10:15:27 -0700 |
|---|---|---|
| committer |   Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2017-03-29 02:15:07 -0700 |
| commit | dab86afdbbd1bc5d5a89b67ed141d2f46c3b4191 (patch) | |
| tree | 2ce6c7d5a6361409b4c8b95fdfe34363bfdf719d /drivers/net/ethernet/intel/i40evf/i40evf_main.c | |
| parent | i40e/i40evf: Add legacy-rx private flag to allow fallback to old Rx flow (diff) | |
| download | linux-dev-dab86afdbbd1bc5d5a89b67ed141d2f46c3b4191.tar.xz linux-dev-dab86afdbbd1bc5d5a89b67ed141d2f46c3b4191.zip | |
i40e/i40evf: Change the way we limit the maximum frame size for Rx
This patch changes the way we handle the maximum frame size for the Rx
path. Previously we were rounding up to 2K for a 1500 MTU and then brining
the max frame size down to MTU plus a fixed amount. With this patch
applied what we now do is limit the maximum frame to 1.5K minus the value
for NET_IP_ALIGN for standard MTU, and for any MTU greater than 1500 we
allow up to the maximum frame size. This makes the behavior more
consistent with the other drivers such as igb which had similar logic. In
addition it reduces the test matrix for MTU since we only have two max
frame sizes that are handled for Rx now.
Change-ID: I23a9d3c857e7df04b0ef28c64df63e659c013f3f
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/i40evf/i40evf_main.c')
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40evf_main.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index 6d666bde9df5..fb2811c23024 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c @@ -686,12 +686,26 @@ static void i40evf_configure_tx(struct i40evf_adapter *adapter) **/ static void i40evf_configure_rx(struct i40evf_adapter *adapter) { + unsigned int rx_buf_len = I40E_RXBUFFER_2048; + struct net_device *netdev = adapter->netdev; struct i40e_hw *hw = &adapter->hw; int i; + /* Legacy Rx will always default to a 2048 buffer size. */ +#if (PAGE_SIZE < 8192) + if (!(adapter->flags & I40EVF_FLAG_LEGACY_RX)) { + /* We use a 1536 buffer size for configurations with + * standard Ethernet mtu. On x86 this gives us enough room + * for shared info and 192 bytes of padding. + */ + if (netdev->mtu <= ETH_DATA_LEN) + rx_buf_len = I40E_RXBUFFER_1536 - NET_IP_ALIGN; + } +#endif + for (i = 0; i < adapter->num_active_queues; i++) { adapter->rx_rings[i].tail = hw->hw_addr + I40E_QRX_TAIL1(i); - adapter->rx_rings[i].rx_buf_len = I40EVF_RXBUFFER_2048; + adapter->rx_rings[i].rx_buf_len = rx_buf_len; } } |