diff options
Diffstat (limited to 'drivers/net/ixgbe/ixgbe_dcb_82599.c')
| -rw-r--r-- | drivers/net/ixgbe/ixgbe_dcb_82599.c | 77 |
1 files changed, 49 insertions, 28 deletions
diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c index 025af8c53ddb..d50cf78c234d 100644 --- a/drivers/net/ixgbe/ixgbe_dcb_82599.c +++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c @@ -39,36 +39,52 @@ */ static s32 ixgbe_dcb_config_packet_buffers_82599(struct ixgbe_hw *hw, u8 rx_pba) { - s32 ret_val = 0; - u32 value = IXGBE_RXPBSIZE_64KB; + int num_tcs = IXGBE_MAX_PACKET_BUFFERS; + u32 rx_pb_size = hw->mac.rx_pb_size << IXGBE_RXPBSIZE_SHIFT; + u32 rxpktsize; + u32 txpktsize; + u32 txpbthresh; u8 i = 0; - /* Setup Rx packet buffer sizes */ - switch (rx_pba) { - case pba_80_48: - /* Setup the first four at 80KB */ - value = IXGBE_RXPBSIZE_80KB; - for (; i < 4; i++) - IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value); - /* Setup the last four at 48KB...don't re-init i */ - value = IXGBE_RXPBSIZE_48KB; - /* Fall Through */ - case pba_equal: - default: - for (; i < IXGBE_MAX_PACKET_BUFFERS; i++) - IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value); - - /* Setup Tx packet buffer sizes */ - for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++) { - IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), - IXGBE_TXPBSIZE_20KB); - IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), - IXGBE_TXPBTHRESH_DCB); - } - break; + /* + * This really means configure the first half of the TCs + * (Traffic Classes) to use 5/8 of the Rx packet buffer + * space. To determine the size of the buffer for each TC, + * we are multiplying the average size by 5/4 and applying + * it to half of the traffic classes. + */ + if (rx_pba == pba_80_48) { + rxpktsize = (rx_pb_size * 5) / (num_tcs * 4); + rx_pb_size -= rxpktsize * (num_tcs / 2); + for (; i < (num_tcs / 2); i++) + IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize); + } + + /* Divide the remaining Rx packet buffer evenly among the TCs */ + rxpktsize = rx_pb_size / (num_tcs - i); + for (; i < num_tcs; i++) + IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize); + + /* + * Setup Tx packet buffer and threshold equally for all TCs + * TXPBTHRESH register is set in K so divide by 1024 and subtract + * 10 since the largest packet we support is just over 9K. + */ + txpktsize = IXGBE_TXPBSIZE_MAX / num_tcs; + txpbthresh = (txpktsize / 1024) - IXGBE_TXPKT_SIZE_MAX; + for (i = 0; i < num_tcs; i++) { + IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), txpktsize); + IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), txpbthresh); + } + + /* Clear unused TCs, if any, to zero buffer size*/ + for (; i < MAX_TRAFFIC_CLASS; i++) { + IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0); + IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), 0); + IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), 0); } - return ret_val; + return 0; } /** @@ -285,12 +301,17 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en) IXGBE_WRITE_REG(hw, IXGBE_FCCFG, reg); /* * Enable Receive PFC - * We will always honor XOFF frames we receive when - * we are in PFC mode. + * 82599 will always honor XOFF frames we receive when + * we are in PFC mode however X540 only honors enabled + * traffic classes. */ reg = IXGBE_READ_REG(hw, IXGBE_MFLCN); reg &= ~IXGBE_MFLCN_RFCE; reg |= IXGBE_MFLCN_RPFCE | IXGBE_MFLCN_DPF; + + if (hw->mac.type == ixgbe_mac_X540) + reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT; + IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg); } else { |