Thread (9 messages) 9 messages, 2 authors, 2024-09-06

Re: [PATCH net-next v9 3/7] net: stmmac: refactor FPE verification process

From: Vladimir Oltean <olteanv@gmail.com>
Date: 2024-09-06 12:53:03
Also in: lkml, netdev

On Fri, Sep 06, 2024 at 12:55:58PM +0800, Furong Xu wrote:
quoted hunk ↗ jump to hunk
@@ -5979,44 +5956,29 @@ static int stmmac_set_features(struct net_device *netdev,
 static void stmmac_fpe_event_status(struct stmmac_priv *priv, int status)
 {
 	struct stmmac_fpe_cfg *fpe_cfg = &priv->fpe_cfg;
-	enum stmmac_fpe_state *lo_state = &fpe_cfg->lo_fpe_state;
-	enum stmmac_fpe_state *lp_state = &fpe_cfg->lp_fpe_state;
-	bool *hs_enable = &fpe_cfg->hs_enable;
 
-	if (status == FPE_EVENT_UNKNOWN || !*hs_enable)
-		return;
+	/* This is interrupt context, just spin_lock() */
+	spin_lock(&fpe_cfg->lock);
 
-	/* If LP has sent verify mPacket, LP is FPE capable */
-	if ((status & FPE_EVENT_RVER) == FPE_EVENT_RVER) {
-		if (*lp_state < FPE_STATE_CAPABLE)
-			*lp_state = FPE_STATE_CAPABLE;
+	if (!fpe_cfg->pmac_enabled || status == FPE_EVENT_UNKNOWN)
+		goto unlock_out;
 
-		/* If user has requested FPE enable, quickly response */
-		if (*hs_enable)
-			stmmac_fpe_send_mpacket(priv, priv->ioaddr,
-						fpe_cfg,
-						MPACKET_RESPONSE);
-	}
+	/* LP has sent verify mPacket */
+	if ((status & FPE_EVENT_RVER) == FPE_EVENT_RVER)
+		stmmac_fpe_send_mpacket(priv, priv->ioaddr, fpe_cfg,
+					MPACKET_RESPONSE);
 
-	/* If Local has sent verify mPacket, Local is FPE capable */
-	if ((status & FPE_EVENT_TVER) == FPE_EVENT_TVER) {
-		if (*lo_state < FPE_STATE_CAPABLE)
-			*lo_state = FPE_STATE_CAPABLE;
-	}
+	/* Local has sent verify mPacket */
+	if ((status & FPE_EVENT_TVER) == FPE_EVENT_TVER &&
+	    fpe_cfg->status != ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED)
+		fpe_cfg->status = ETHTOOL_MM_VERIFY_STATUS_VERIFYING;
 
-	/* If LP has sent response mPacket, LP is entering FPE ON */
+	/* LP has sent response mPacket */
 	if ((status & FPE_EVENT_RRSP) == FPE_EVENT_RRSP)
-		*lp_state = FPE_STATE_ENTERING_ON;
+		fpe_cfg->status = ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED;
Nitpick, doesn't affect normal behavior.
If the link partner crafts an unsolicited Response mPacket, and we have
verify_enabled = false, what we should do is we should ignore it.
But what the code does is to transition the state to SUCCEEDED, as if
verify_enabled was true.

We should ignore FPE_EVENT_RRSP events if we are in the
ETHTOOL_MM_VERIFY_STATUS_DISABLED state.

Depending on how the maintainers feel, this could also be handled in a
subsequent patch.
 
-	/* If Local has sent response mPacket, Local is entering FPE ON */
-	if ((status & FPE_EVENT_TRSP) == FPE_EVENT_TRSP)
-		*lo_state = FPE_STATE_ENTERING_ON;
-
-	if (!test_bit(__FPE_REMOVING, &priv->fpe_task_state) &&
-	    !test_and_set_bit(__FPE_TASK_SCHED, &priv->fpe_task_state) &&
-	    priv->fpe_wq) {
-		queue_work(priv->fpe_wq, &priv->fpe_task);
-	}
+unlock_out:
+	spin_unlock(&fpe_cfg->lock);
 }
 
 static void stmmac_common_interrupt(struct stmmac_priv *priv)
  
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