igc: Add flow control support (0373ad4d) · Commits · 戴 / test

drivers/net/ethernet/intel/igc/igc_defines.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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);