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net: ravb: Always process TX descriptor ring

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[ Upstream commit 596a425491 ]

The TX queue should be serviced each time the poll function is called,
even if the full RX work budget has been consumed. This prevents
starvation of the TX queue when RX bandwidth usage is high.

Fixes: c156633f13 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/20240402145305.82148-1-paul.barker.ct@bp.renesas.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul Barker 2024-04-02 15:53:04 +01:00 committed by Greg Kroah-Hartman
parent fcc739d7f0
commit 9df33e57f5
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/renesas/ravb_main.c
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@ -969,12 +969,12 @@ static int ravb_poll(struct napi_struct *napi, int budget)
int q = napi - priv->napi;
int mask = BIT(q);
int quota = budget;
bool unmask;
/* Processing RX Descriptor Ring */
/* Clear RX interrupt */
ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
if (ravb_rx(ndev, &quota, q))
goto out;
unmask = !ravb_rx(ndev, &quota, q);
/* Processing TX Descriptor Ring */
spin_lock_irqsave(&priv->lock, flags);
@ -984,6 +984,9 @@ static int ravb_poll(struct napi_struct *napi, int budget)
netif_wake_subqueue(ndev, q);
spin_unlock_irqrestore(&priv->lock, flags);
if (!unmask)
goto out;
napi_complete(napi);
/* Re-enable RX/TX interrupts */