diff mbox series

[net,3/6] net: enetc: take the MDIO lock only once per NAPI poll cycle

Message ID 20210225112357.3785911-4-olteanv@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Fixes for NXP ENETC driver | expand

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Commit Message

Vladimir Oltean Feb. 25, 2021, 11:23 a.m. UTC 
From: Vladimir Oltean <vladimir.oltean@nxp.com>

The workaround for the ENETC MDIO erratum caused a performance
degradation of 82 Kpps (seen with IP forwarding of two 1Gbps streams of
64B packets). This is due to excessive locking and unlocking in the fast
path, which can be avoided.

By taking the MDIO read-side lock only once per NAPI poll cycle, we are
able to regain 54 Kpps (65%) of the performance hit. The rest of the
performance degradation comes from the TX data path, but unfortunately
it doesn't look like we can optimize that away easily, even with
netdev_xmit_more(), there just isn't any skb batching done, to help with
taking the MDIO lock less often than once per packet.

Fixes: fd5736bf9f23 ("enetc: Workaround for MDIO register access issue")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c  | 31 ++++++-------------
 .../net/ethernet/freescale/enetc/enetc_hw.h   |  2 ++
 2 files changed, 11 insertions(+), 22 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 43f0fae30080..eebe08a99270 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -281,6 +281,8 @@  static int enetc_poll(struct napi_struct *napi, int budget)
 	int work_done;
 	int i;
 
+	enetc_lock_mdio();
+
 	for (i = 0; i < v->count_tx_rings; i++)
 		if (!enetc_clean_tx_ring(&v->tx_ring[i], budget))
 			complete = false;
@@ -291,8 +293,10 @@  static int enetc_poll(struct napi_struct *napi, int budget)
 	if (work_done)
 		v->rx_napi_work = true;
 
-	if (!complete)
+	if (!complete) {
+		enetc_unlock_mdio();
 		return budget;
+	}
 
 	napi_complete_done(napi, work_done);
 
@@ -301,8 +305,6 @@  static int enetc_poll(struct napi_struct *napi, int budget)
 
 	v->rx_napi_work = false;
 
-	enetc_lock_mdio();
-
 	/* enable interrupts */
 	enetc_wr_reg_hot(v->rbier, ENETC_RBIER_RXTIE);
 
@@ -327,8 +329,8 @@  static void enetc_get_tx_tstamp(struct enetc_hw *hw, union enetc_tx_bd *txbd,
 {
 	u32 lo, hi, tstamp_lo;
 
-	lo = enetc_rd(hw, ENETC_SICTR0);
-	hi = enetc_rd(hw, ENETC_SICTR1);
+	lo = enetc_rd_hot(hw, ENETC_SICTR0);
+	hi = enetc_rd_hot(hw, ENETC_SICTR1);
 	tstamp_lo = le32_to_cpu(txbd->wb.tstamp);
 	if (lo <= tstamp_lo)
 		hi -= 1;
@@ -358,9 +360,7 @@  static bool enetc_clean_tx_ring(struct enetc_bdr *tx_ring, int napi_budget)
 	i = tx_ring->next_to_clean;
 	tx_swbd = &tx_ring->tx_swbd[i];
 
-	enetc_lock_mdio();
 	bds_to_clean = enetc_bd_ready_count(tx_ring, i);
-	enetc_unlock_mdio();
 
 	do_tstamp = false;
 
@@ -403,8 +403,6 @@  static bool enetc_clean_tx_ring(struct enetc_bdr *tx_ring, int napi_budget)
 			tx_swbd = tx_ring->tx_swbd;
 		}
 
-		enetc_lock_mdio();
-
 		/* BD iteration loop end */
 		if (is_eof) {
 			tx_frm_cnt++;
@@ -415,8 +413,6 @@  static bool enetc_clean_tx_ring(struct enetc_bdr *tx_ring, int napi_budget)
 
 		if (unlikely(!bds_to_clean))
 			bds_to_clean = enetc_bd_ready_count(tx_ring, i);
-
-		enetc_unlock_mdio();
 	}
 
 	tx_ring->next_to_clean = i;
@@ -660,8 +656,6 @@  static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 		u32 bd_status;
 		u16 size;
 
-		enetc_lock_mdio();
-
 		if (cleaned_cnt >= ENETC_RXBD_BUNDLE) {
 			int count = enetc_refill_rx_ring(rx_ring, cleaned_cnt);
 
@@ -672,19 +666,15 @@  static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 
 		rxbd = enetc_rxbd(rx_ring, i);
 		bd_status = le32_to_cpu(rxbd->r.lstatus);
-		if (!bd_status) {
-			enetc_unlock_mdio();
+		if (!bd_status)
 			break;
-		}
 
 		enetc_wr_reg_hot(rx_ring->idr, BIT(rx_ring->index));
 		dma_rmb(); /* for reading other rxbd fields */
 		size = le16_to_cpu(rxbd->r.buf_len);
 		skb = enetc_map_rx_buff_to_skb(rx_ring, i, size);
-		if (!skb) {
-			enetc_unlock_mdio();
+		if (!skb)
 			break;
-		}
 
 		enetc_get_offloads(rx_ring, rxbd, skb);
 
@@ -696,7 +686,6 @@  static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 
 		if (unlikely(bd_status &
 			     ENETC_RXBD_LSTATUS(ENETC_RXBD_ERR_MASK))) {
-			enetc_unlock_mdio();
 			dev_kfree_skb(skb);
 			while (!(bd_status & ENETC_RXBD_LSTATUS_F)) {
 				dma_rmb();
@@ -736,8 +725,6 @@  static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 
 		enetc_process_skb(rx_ring, skb);
 
-		enetc_unlock_mdio();
-
 		napi_gro_receive(napi, skb);
 
 		rx_frm_cnt++;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index c71fe8d751d5..8b54562f5da6 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -453,6 +453,8 @@  static inline u64 _enetc_rd_reg64_wa(void __iomem *reg)
 #define enetc_wr_reg(reg, val)		_enetc_wr_reg_wa((reg), (val))
 #define enetc_rd(hw, off)		enetc_rd_reg((hw)->reg + (off))
 #define enetc_wr(hw, off, val)		enetc_wr_reg((hw)->reg + (off), val)
+#define enetc_rd_hot(hw, off)		enetc_rd_reg_hot((hw)->reg + (off))
+#define enetc_wr_hot(hw, off, val)	enetc_wr_reg_hot((hw)->reg + (off), val)
 #define enetc_rd64(hw, off)		_enetc_rd_reg64_wa((hw)->reg + (off))
 /* port register accessors - PF only */
 #define enetc_port_rd(hw, off)		enetc_rd_reg((hw)->port + (off))