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net_util: Use two two different enums for MQ error

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Rather than use an embedded String inside the MultiQueueSupport error
value use two different values to differentiate the two cases.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-07-07 15:06:53 +01:00
parent 3e807a19b7
commit 2efd307c4e
1 changed files with 6 additions and 8 deletions
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14
net_util/src/open_tap.rs
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@ -13,8 +13,10 @@ use virtio_bindings::bindings::virtio_net::virtio_net_hdr_v1;
pub enum Error {
/// Failed to convert an hexadecimal string into an integer.
ConvertHexStringToInt(std::num::ParseIntError),
/// Error related to the multiqueue support.
MultiQueueSupport(String),
/// Error related to the multiqueue support (no support TAP side).
MultiQueueNoTapSupport,
/// Error related to the multiqueue support (no support device side).
MultiQueueNoDeviceSupport,
/// Failed to read the TAP flags from sysfs.
ReadSysfsTunFlags(io::Error),
/// Open tap device failed.
@ -53,13 +55,9 @@ fn check_mq_support(if_name: &Option<&str>, queue_pairs: usize) -> Result<()> {
let tun_flags = u32::from_str_radix(tun_flags_str.trim().trim_start_matches("0x"), 16)
.map_err(Error::ConvertHexStringToInt)?;
if (tun_flags & net_gen::IFF_MULTI_QUEUE != 0) && !mq {
return Err(Error::MultiQueueSupport(String::from(
"TAP interface supports MQ while device does not",
)));
return Err(Error::MultiQueueNoDeviceSupport);
} else if (tun_flags & net_gen::IFF_MULTI_QUEUE == 0) && mq {
return Err(Error::MultiQueueSupport(String::from(
"Device supports MQ while TAP interface does not",
)));
return Err(Error::MultiQueueNoTapSupport);
}
}
Ok(())