sfc: check MTU against minimum threshold (72a31d85) · Commits · 戴 / test

drivers/net/ethernet/sfc/efx.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -2263,8 +2263,18 @@ static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
		rc = efx_check_disabled(efx);
		if (rc)
		return rc;
		if (new_mtu > EFX_MAX_MTU)
		if (new_mtu > EFX_MAX_MTU) {
		netif_err(efx, drv, efx->net_dev,
		"Requested MTU of %d too big (max: %d)\n",
		new_mtu, EFX_MAX_MTU);
		return -EINVAL;
		}
		if (new_mtu < EFX_MIN_MTU) {
		netif_err(efx, drv, efx->net_dev,
		"Requested MTU of %d too small (min: %d)\n",
		new_mtu, EFX_MIN_MTU);
		return -EINVAL;
		}

		netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);

+3 −0

Original line number	Diff line number	Diff line
		@@ -76,6 +76,9 @@
		/* Maximum possible MTU the driver supports */
		#define EFX_MAX_MTU (9 * 1024)

		/* Minimum MTU, from RFC791 (IP) */
		#define EFX_MIN_MTU 68

		/* Size of an RX scatter buffer. Small enough to pack 2 into a 4K page,
		* and should be a multiple of the cache line size.
		*/