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realtek: RTL93xx: do not drop packets in software

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Now that the counter registers work fine there is no need to
free buffers in software. Hardware will automatically block
input processing when software processing is too slow.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/19960
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Markus Stockhausen 2025-09-05 02:33:56 -04:00 • committed by Robert Marko
parent a93e725140
commit e3ccd1a287
1 changed files with 0 additions and 34 deletions
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34
target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
View file

@ -331,39 +331,6 @@ static bool rtl931x_decode_tag(struct p_hdr *h, struct dsa_tag *t)
return t->l2_offloaded;
}
/* Discard the RX ring-buffers, called as part of the net-ISR
* when the buffer runs over
*/
static void rtl838x_rb_cleanup(struct rtl838x_eth_priv *priv, int status)
{
for (int r = 0; r < priv->rxrings; r++) {
struct ring_b *ring = priv->membase;
struct p_hdr *h;
u32 *last;
pr_debug("In %s working on r: %d\n", __func__, r);
last = (u32 *)KSEG1ADDR(sw_r32(priv->r->dma_if_rx_cur + r * 4));
do {
if ((ring->rx_r[r][ring->c_rx[r]] & 0x1))
break;
pr_debug("Got something: %d\n", ring->c_rx[r]);
h = &ring->rx_header[r][ring->c_rx[r]];
memset(h, 0, sizeof(struct p_hdr));
h->buf = (u8 *)KSEG1ADDR(ring->rx_space +
r * priv->rxringlen * RING_BUFFER +
ring->c_rx[r] * RING_BUFFER);
h->size = RING_BUFFER;
/* make sure the header is visible to the ASIC */
mb();
ring->rx_r[r][ring->c_rx[r]] = KSEG1ADDR(h) | 0x1 | (ring->c_rx[r] == (priv->rxringlen - 1) ?
WRAP :
0x1);
ring->c_rx[r] = (ring->c_rx[r] + 1) % priv->rxringlen;
} while (&ring->rx_r[r][ring->c_rx[r]] != last);
}
}
struct fdb_update_work {
struct work_struct work;
struct net_device *ndev;
@ -497,7 +464,6 @@ static irqreturn_t rtl93xx_net_irq(int irq, void *dev_id)
pr_debug("RX buffer overrun: status %x, mask: %x\n",
status_rx_r, sw_r32(priv->r->dma_if_intr_rx_runout_msk));
sw_w32(status_rx_r, priv->r->dma_if_intr_rx_runout_sts);
rtl838x_rb_cleanup(priv, status_rx_r);
}
return IRQ_HANDLED;