linux-kernel - [PATCH 5.1 05/70] net: ethernet: ti: cpsw

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Date:   Sun,  9 Jun 2019 18:41:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.1 05/70] net: ethernet: ti: cpsw_ethtool: fix ethtool ring param set

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

[ Upstream commit 09faf5a7d7c0bcb07faba072f611937af9dd5788 ]

Fix ability to set RX descriptor number, the reason - initially
"tx_max_pending" was set incorrectly, but the issue appears after
adding sanity check, so fix is for "sanity" patch.

Fixes: 37e2d99b59c476 ("ethtool: Ensure new ring parameters are within bounds during SRINGPARAM")
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/ti/cpsw.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -3130,6 +3130,7 @@ static void cpsw_get_ringparam(struct ne
 	struct cpsw_common *cpsw = priv->cpsw;
 
 	/* not supported */
+	ering->tx_max_pending = descs_pool_size - CPSW_MAX_QUEUES;
 	ering->tx_max_pending = 0;
 	ering->tx_pending = cpdma_get_num_tx_descs(cpsw->dma);
 	ering->rx_max_pending = descs_pool_size - CPSW_MAX_QUEUES;