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net: fec: use a member variable for maximum buffer size

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Refactor code to support Jumbo frame functionality by adding a member
variable in the fec_enet_private structure to store PKT_MAXBUF_SIZE.

Remove the OPT_FRAME_SIZE and define a new macro OPT_ARCH_HAS_MAX_FL to
indicate architectures that support configurable maximum frame length.
And update the MAX_FL register value to max_buf_size when
OPT_ARCH_HAS_MAX_FL is defined as 1.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Wei Fang <wei.fang@nxp.com>
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Link: https://patch.msgid.link/20250910185211.721341-2-shenwei.wang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Shenwei Wang
2025-09-10 13:52:06 -05:00
committed by Jakub Kicinski
parent d586676a27
commit ec2a1681ed
2 changed files with 11 additions and 6 deletions
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1
drivers/net/ethernet/freescale/fec.h
View File

@@ -619,6 +619,7 @@ struct fec_enet_private {
unsigned int total_tx_ring_size;
unsigned int total_rx_ring_size;
unsigned int max_buf_size;
struct platform_device *pdev;

16
drivers/net/ethernet/freescale/fec_main.c
View File

@@ -253,9 +253,9 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
defined(CONFIG_M520x) || defined(CONFIG_M532x) || defined(CONFIG_ARM) || \
defined(CONFIG_ARM64)
#define OPT_FRAME_SIZE (PKT_MAXBUF_SIZE << 16)
#define OPT_ARCH_HAS_MAX_FL 1
#else
#define OPT_FRAME_SIZE 0
#define OPT_ARCH_HAS_MAX_FL 0
#endif
/* FEC MII MMFR bits definition */
@@ -1083,7 +1083,7 @@ static void fec_enet_enable_ring(struct net_device *ndev)
for (i = 0; i < fep->num_rx_queues; i++) {
rxq = fep->rx_queue[i];
writel(rxq->bd.dma, fep->hwp + FEC_R_DES_START(i));
writel(PKT_MAXBUF_SIZE, fep->hwp + FEC_R_BUFF_SIZE(i));
writel(fep->max_buf_size, fep->hwp + FEC_R_BUFF_SIZE(i));
/* enable DMA1/2 */
if (i)
@@ -1145,8 +1145,11 @@ static void
fec_restart(struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
u32 rcntl = OPT_FRAME_SIZE | FEC_RCR_MII;
u32 ecntl = FEC_ECR_ETHEREN;
u32 rcntl = FEC_RCR_MII;
if (OPT_ARCH_HAS_MAX_FL)
rcntl |= fep->max_buf_size << 16;
if (fep->bufdesc_ex)
fec_ptp_save_state(fep);
@@ -1191,7 +1194,7 @@ fec_restart(struct net_device *ndev)
else
val &= ~FEC_RACC_OPTIONS;
writel(val, fep->hwp + FEC_RACC);
writel(PKT_MAXBUF_SIZE, fep->hwp + FEC_FTRL);
writel(fep->max_buf_size, fep->hwp + FEC_FTRL);
}
#endif
@@ -4560,7 +4563,8 @@ fec_probe(struct platform_device *pdev)
fec_enet_clk_enable(ndev, false);
pinctrl_pm_select_sleep_state(&pdev->dev);
ndev->max_mtu = PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN;
fep->max_buf_size = PKT_MAXBUF_SIZE;
ndev->max_mtu = fep->max_buf_size - ETH_HLEN - ETH_FCS_LEN;
ret = register_netdev(ndev);
if (ret)