diff options
| author |   Sasha Neftin <sasha.neftin@intel.com> | 2019-04-18 10:11:08 +0300 |
|---|---|---|
| committer |   Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2019-05-28 16:13:57 -0700 |
| commit | 0373ad4d051cdc491e9627d4a66d00b258b6cd80 (patch) | |
| tree | 4fd5ee8b88524a9ab2e3b29e74c686978c3f71e6 /drivers/net | |
| parent | e1000e: start network tx queue only when link is up (diff) | |
| download | linux-dev-0373ad4d051cdc491e9627d4a66d00b258b6cd80.tar.xz linux-dev-0373ad4d051cdc491e9627d4a66d00b258b6cd80.zip | |
igc: Add flow control support
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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc_defines.h | 3 | ||||
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc_main.c | 21 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h index 5f6bc67cb33b..fc0ccfe38a20 100644 --- a/drivers/net/ethernet/intel/igc/igc_defines.h +++ b/drivers/net/ethernet/intel/igc/igc_defines.h @@ -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 diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 28072b9aa932..93f3b4e6185b 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -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); |