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can: mcp251xfd: mcp251xfd_ring_init(): check TX-coalescing configuration

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When changing the interface from CAN-CC to CAN-FD mode the old
coalescing parameters are re-used. This might cause problem, as the
configured parameters are too big for CAN-FD mode.

During testing an invalid TX coalescing configuration has been seen.
The problem should be been fixed in the previous patch, but add a
safeguard here to ensure that the number of TEF coalescing buffers (if
configured) is exactly the half of all TEF buffers.

Link: https://lore.kernel.org/all/20240805-mcp251xfd-fix-ringconfig-v1-2-72086f0ca5ee@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2024-07-05 17:24:42 +02:00
parent 50ea5449c5
commit ac2b81eb8b
1 changed files with 11 additions and 3 deletions
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14
drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
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@ -290,7 +290,7 @@ int mcp251xfd_ring_init(struct mcp251xfd_priv *priv)
const struct mcp251xfd_rx_ring *rx_ring;
u16 base = 0, ram_used;
u8 fifo_nr = 1;
int i;
int err = 0, i;
netdev_reset_queue(priv->ndev);
@ -386,10 +386,18 @@ int mcp251xfd_ring_init(struct mcp251xfd_priv *priv)
netdev_err(priv->ndev,
"Error during ring configuration, using more RAM (%u bytes) than available (%u bytes).\n",
ram_used, MCP251XFD_RAM_SIZE);
return -ENOMEM;
err = -ENOMEM;
}
return 0;
if (priv->tx_obj_num_coalesce_irq &&
priv->tx_obj_num_coalesce_irq * 2 != priv->tx->obj_num) {
netdev_err(priv->ndev,
"Error during ring configuration, number of TEF coalescing buffers (%u) must be half of TEF buffers (%u).\n",
priv->tx_obj_num_coalesce_irq, priv->tx->obj_num);
err = -EINVAL;
}
return err;
}
void mcp251xfd_ring_free(struct mcp251xfd_priv *priv)