[PATCH 2/4] igb: Introduce txrx ring enable/disable functions

Sriram Yagnaraman
2023-07-04T10:01:31Z

Add enable/disable functions for TX and RX rings, will be used in later
patches when AF_XDP zero-copy support is added.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
---
drivers/net/ethernet/intel/igb/igb.h | 5 ++-
drivers/net/ethernet/intel/igb/igb_main.c | 41 +++++++++++++++++++++++
2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 94440af6cf4b..5fa011c6ef2f 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -384,7 +384,8 @@ enum e1000_ring_flags_t {
IGB_RING_FLAG_RX_SCTP_CSUM,
IGB_RING_FLAG_RX_LB_VLAN_BSWAP,
IGB_RING_FLAG_TX_CTX_IDX,
- IGB_RING_FLAG_TX_DETECT_HANG
+ IGB_RING_FLAG_TX_DETECT_HANG,
+ IGB_RING_FLAG_TX_DISABLED
};

#define ring_uses_large_buffer(ring) \
@@ -735,6 +736,8 @@ void igb_free_tx_resources(struct igb_ring *);
void igb_free_rx_resources(struct igb_ring *);
void igb_configure_tx_ring(struct igb_adapter *, struct igb_ring *);
void igb_configure_rx_ring(struct igb_adapter *, struct igb_ring *);
+void igb_txrx_ring_disable(struct igb_adapter *adapter, u16 qid);
+void igb_txrx_ring_enable(struct igb_adapter *adapter, u16 qid);
void igb_setup_tctl(struct igb_adapter *);
void igb_setup_rctl(struct igb_adapter *);
void igb_setup_srrctl(struct igb_adapter *, struct igb_ring *);
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index dadc3d423cfd..391c0eb136d9 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4856,6 +4856,47 @@ static void igb_configure_rx(struct igb_adapter *adapter)
}
}

+void igb_txrx_ring_disable(struct igb_adapter *adapter, u16 qid)
+{
+ struct e1000_hw *hw = &adapter->hw;
+ struct igb_ring *tx_ring = adapter->tx_ring[qid];
+ struct igb_ring *rx_ring = adapter->rx_ring[qid];
+
+ set_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags);
+
+ wr32(E1000_TXDCTL(tx_ring->reg_idx), 0);
+ wr32(E1000_RXDCTL(rx_ring->reg_idx), 0);
+
+ /* Rx/Tx share the same napi context. */
+ napi_disable(&rx_ring->q_vector->napi);
+
+ igb_clean_tx_ring(tx_ring);
+ igb_clean_rx_ring(rx_ring);
+
+ memset(&rx_ring->rx_stats, 0, sizeof(rx_ring->rx_stats));
+ memset(&tx_ring->tx_stats, 0, sizeof(tx_ring->tx_stats));
+}
+
+void igb_txrx_ring_enable(struct igb_adapter *adapter, u16 qid)
+{
+ struct igb_ring *tx_ring = adapter->tx_ring[qid];
+ struct igb_ring *rx_ring = adapter->rx_ring[qid];
+
+ /* Rx/Tx share the same napi context. */
+ napi_enable(&rx_ring->q_vector->napi);
+
+ igb_configure_tx_ring(adapter, tx_ring);
+ igb_configure_rx_ring(adapter, rx_ring);
+
+ /* call igb_desc_unused which always leaves
+ * at least 1 descriptor unused to make sure
+ * next_to_use != next_to_clean
+ */
+ igb_alloc_rx_buffers(rx_ring, igb_desc_unused(rx_ring));
+
+ clear_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags);
+}
+
/**
* igb_free_tx_resources - Free Tx Resources per Queue
* @tx_ring: Tx descriptor ring for a specific queue
--
2.34.1