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ixgbe: Fix checking TFCS register for TXOFF status when DCB is enabled
When DCB is enabled, the ixgbe_check_tx_hang() should check the corresponding TC's TXOFF in TFCS based on the TC that the tx ring belongs to. Adds a function to map from the tx_ring hw reg_idx to the correspodning TC and read TFCS accordingly. Signed-off-by: Yi Zou <yi.zou@intel.com> Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -226,6 +226,56 @@ static void ixgbe_unmap_and_free_tx_resource(struct ixgbe_adapter *adapter,
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/* tx_buffer_info must be completely set up in the transmit path */
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}
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/**
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* ixgbe_tx_is_paused - check if the tx ring is paused
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* @adapter: the ixgbe adapter
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* @tx_ring: the corresponding tx_ring
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*
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* If not in DCB mode, checks TFCS.TXOFF, otherwise, find out the
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* corresponding TC of this tx_ring when checking TFCS.
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*
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* Returns : true if paused
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*/
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static inline bool ixgbe_tx_is_paused(struct ixgbe_adapter *adapter,
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struct ixgbe_ring *tx_ring)
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{
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int tc;
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u32 txoff = IXGBE_TFCS_TXOFF;
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#ifdef CONFIG_IXGBE_DCB
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if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
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int reg_idx = tx_ring->reg_idx;
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int dcb_i = adapter->ring_feature[RING_F_DCB].indices;
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if (adapter->hw.mac.type == ixgbe_mac_82598EB) {
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tc = reg_idx >> 2;
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txoff = IXGBE_TFCS_TXOFF0;
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} else if (adapter->hw.mac.type == ixgbe_mac_82599EB) {
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tc = 0;
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txoff = IXGBE_TFCS_TXOFF;
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if (dcb_i == 8) {
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/* TC0, TC1 */
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tc = reg_idx >> 5;
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if (tc == 2) /* TC2, TC3 */
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tc += (reg_idx - 64) >> 4;
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else if (tc == 3) /* TC4, TC5, TC6, TC7 */
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tc += 1 + ((reg_idx - 96) >> 3);
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} else if (dcb_i == 4) {
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/* TC0, TC1 */
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tc = reg_idx >> 6;
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if (tc == 1) {
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tc += (reg_idx - 64) >> 5;
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if (tc == 2) /* TC2, TC3 */
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tc += (reg_idx - 96) >> 4;
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}
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}
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}
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txoff <<= tc;
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}
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#endif
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return IXGBE_READ_REG(&adapter->hw, IXGBE_TFCS) & txoff;
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}
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static inline bool ixgbe_check_tx_hang(struct ixgbe_adapter *adapter,
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struct ixgbe_ring *tx_ring,
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unsigned int eop)
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@ -237,7 +287,7 @@ static inline bool ixgbe_check_tx_hang(struct ixgbe_adapter *adapter,
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adapter->detect_tx_hung = false;
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if (tx_ring->tx_buffer_info[eop].time_stamp &&
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time_after(jiffies, tx_ring->tx_buffer_info[eop].time_stamp + HZ) &&
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!(IXGBE_READ_REG(&adapter->hw, IXGBE_TFCS) & IXGBE_TFCS_TXOFF)) {
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!ixgbe_tx_is_paused(adapter, tx_ring)) {
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/* detected Tx unit hang */
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union ixgbe_adv_tx_desc *tx_desc;
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tx_desc = IXGBE_TX_DESC_ADV(*tx_ring, eop);
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