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net: mvneta: enable jumbo frames if the loaded XDP program support frags

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Enable the capability to receive jumbo frames even if the interface is
running in XDP mode if the loaded program declare to properly support
xdp frags. At same time reject a xdp program not supporting xdp frags
if the driver is running in xdp frags mode.

Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/6909f81a3cbb8fb6b88e914752c26395771b882a.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2022-01-21 11:09:53 +01:00 committed by Alexei Starovoitov
parent c2f2cdbeff
commit e121d27083
1 changed files with 9 additions and 4 deletions
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13
drivers/net/ethernet/marvell/mvneta.c
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@ -3778,6 +3778,7 @@ static void mvneta_percpu_disable(void *arg)
static int mvneta_change_mtu(struct net_device *dev, int mtu)
{
struct mvneta_port *pp = netdev_priv(dev);
struct bpf_prog *prog = pp->xdp_prog;
int ret;
if (!IS_ALIGNED(MVNETA_RX_PKT_SIZE(mtu), 8)) {
@ -3786,8 +3787,11 @@ static int mvneta_change_mtu(struct net_device *dev, int mtu)
mtu = ALIGN(MVNETA_RX_PKT_SIZE(mtu), 8);
}
if (pp->xdp_prog && mtu > MVNETA_MAX_RX_BUF_SIZE) {
netdev_info(dev, "Illegal MTU value %d for XDP mode\n", mtu);
if (prog && !prog->aux->xdp_has_frags &&
mtu > MVNETA_MAX_RX_BUF_SIZE) {
netdev_info(dev, "Illegal MTU %d for XDP prog without frags\n",
mtu);
return -EINVAL;
}
@ -4528,8 +4532,9 @@ static int mvneta_xdp_setup(struct net_device *dev, struct bpf_prog *prog,
struct mvneta_port *pp = netdev_priv(dev);
struct bpf_prog *old_prog;
if (prog && dev->mtu > MVNETA_MAX_RX_BUF_SIZE) {
NL_SET_ERR_MSG_MOD(extack, "MTU too large for XDP");
if (prog && !prog->aux->xdp_has_frags &&
dev->mtu > MVNETA_MAX_RX_BUF_SIZE) {
NL_SET_ERR_MSG_MOD(extack, "prog does not support XDP frags");
return -EOPNOTSUPP;
}