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net: axienet: limit minimum TX ring size

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commit 70f5817ded upstream.

The driver will not work properly if the TX ring size is set to below
MAX_SKB_FRAGS + 1 since it needs to hold at least one full maximally
fragmented packet in the TX ring. Limit setting the ring size to below
this value.

Fixes: 8b09ca823f ("net: axienet: Make RX/TX ring sizes configurable")
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robert Hancock
2022-01-18 15:41:28 -06:00
committed by Greg Kroah-Hartman
parent 2f548489d6
commit 7a3d3d7f6d
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@@ -43,6 +43,7 @@
/* Descriptors defines for Tx and Rx DMA */
#define TX_BD_NUM_DEFAULT 64
#define RX_BD_NUM_DEFAULT 1024
#define TX_BD_NUM_MIN (MAX_SKB_FRAGS + 1)
#define TX_BD_NUM_MAX 4096
#define RX_BD_NUM_MAX 4096
@@ -1373,7 +1374,8 @@ static int axienet_ethtools_set_ringparam(struct net_device *ndev,
if (ering->rx_pending > RX_BD_NUM_MAX ||
ering->rx_mini_pending ||
ering->rx_jumbo_pending ||
ering->rx_pending > TX_BD_NUM_MAX)
ering->tx_pending < TX_BD_NUM_MIN ||
ering->tx_pending > TX_BD_NUM_MAX)
return -EINVAL;
if (netif_running(ndev))