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igc: Add flow control support

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This change adds flow control settings. This is required to
enable the legacy flow control support.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Sasha Neftin 2019-04-18 10:11:08 +03:00 committed by Jeff Kirsher
parent d17ba0f616
commit 0373ad4d05
2 changed files with 24 additions and 0 deletions
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3
drivers/net/ethernet/intel/igc/igc_defines.h
View File

@ -66,6 +66,9 @@
#define IGC_CONNSW_AUTOSENSE_EN 0x1
/* As per the EAS the maximum supported size is 9.5KB (9728 bytes) */
#define MAX_JUMBO_FRAME_SIZE 0x2600
/* PBA constants */
#define IGC_PBA_34K 0x0022

21
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -72,6 +72,27 @@ void igc_reset(struct igc_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
struct igc_hw *hw = &adapter->hw;
struct igc_fc_info *fc = &hw->fc;
u32 pba, hwm;
/* Repartition PBA for greater than 9k MTU if required */
pba = IGC_PBA_34K;
/* flow control settings
* The high water mark must be low enough to fit one full frame
* after transmitting the pause frame. As such we must have enough
* space to allow for us to complete our current transmit and then
* receive the frame that is in progress from the link partner.
* Set it to:
* - the full Rx FIFO size minus one full Tx plus one full Rx frame
*/
hwm = (pba << 10) - (adapter->max_frame_size + MAX_JUMBO_FRAME_SIZE);
fc->high_water = hwm & 0xFFFFFFF0; /* 16-byte granularity */
fc->low_water = fc->high_water - 16;
fc->pause_time = 0xFFFF;
fc->send_xon = 1;
fc->current_mode = fc->requested_mode;
hw->mac.ops.reset_hw(hw);