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net: marvell: mvpp2: increase MTU limit when XDP enabled

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Currently mvpp2_xdp_setup won't allow attaching XDP program if
  mtu > ETH_DATA_LEN (1500).

The mvpp2_change_mtu on the other hand checks whether
  MVPP2_RX_PKT_SIZE(mtu) > MVPP2_BM_LONG_PKT_SIZE.

These two checks are semantically different.

Moreover this limit can be increased to MVPP2_MAX_RX_BUF_SIZE, since in
mvpp2_rx we have
  xdp.data = data + MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM;
  xdp.frame_sz = PAGE_SIZE;

Change the checks to check whether
  mtu > MVPP2_MAX_RX_BUF_SIZE

Fixes: 07dd0a7aae ("mvpp2: add basic XDP support")
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Behún 2021-11-22 21:08:34 +01:00 committed by David S. Miller
parent e4e9bfb7c9
commit 7b1b62bc1e
1 changed files with 8 additions and 6 deletions
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14
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -5017,11 +5017,13 @@ static int mvpp2_change_mtu(struct net_device *dev, int mtu)
mtu = ALIGN(MVPP2_RX_PKT_SIZE(mtu), 8);
}
if (port->xdp_prog && mtu > MVPP2_MAX_RX_BUF_SIZE) {
netdev_err(dev, "Illegal MTU value %d (> %d) for XDP mode\n",
mtu, (int)MVPP2_MAX_RX_BUF_SIZE);
return -EINVAL;
}
if (MVPP2_RX_PKT_SIZE(mtu) > MVPP2_BM_LONG_PKT_SIZE) {
if (port->xdp_prog) {
netdev_err(dev, "Jumbo frames are not supported with XDP\n");
return -EINVAL;
}
if (priv->percpu_pools) {
netdev_warn(dev, "mtu %d too high, switching to shared buffers", mtu);
mvpp2_bm_switch_buffers(priv, false);
@ -5307,8 +5309,8 @@ static int mvpp2_xdp_setup(struct mvpp2_port *port, struct netdev_bpf *bpf)
bool running = netif_running(port->dev);
bool reset = !prog != !port->xdp_prog;
if (port->dev->mtu > ETH_DATA_LEN) {
NL_SET_ERR_MSG_MOD(bpf->extack, "XDP is not supported with jumbo frames enabled");
if (port->dev->mtu > MVPP2_MAX_RX_BUF_SIZE) {
NL_SET_ERR_MSG_MOD(bpf->extack, "MTU too large for XDP");
return -EOPNOTSUPP;
}