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net_util: Simplify TX/RX queue handling

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The main idea behind this commit is to remove all the complexity
associated with TX/RX handling for virtio-net. By using writev() and
readv() syscalls, we could get rid of intermediate buffers for both
queues.

The complexity regarding the TAP registration has been simplified as
well. The RX queue is only processed when some data are ready to be
read from TAP. The event related to the RX queue getting more
descriptors only serves the purpose to register the TAP file if it's not
already.

With all these simplifications, the code is more readable but more
performant as well. We can see an improvement of 10% for a single
queue device.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2021-02-16 22:17:37 +01:00
committed by Rob Bradford
parent 5ed2a654e8
commit 4ed0e1a3c8
5 changed files with 160 additions and 265 deletions
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2
vmm/src/seccomp_filters.rs
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@@ -353,6 +353,7 @@ fn vmm_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
allow_syscall(libc::SYS_pwrite64),
allow_syscall(libc::SYS_pwritev),
allow_syscall(libc::SYS_read),
allow_syscall(libc::SYS_readv),
#[cfg(target_arch = "x86_64")]
allow_syscall(libc::SYS_readlink),
allow_syscall(libc::SYS_recvfrom),
@@ -392,6 +393,7 @@ fn vmm_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
allow_syscall(libc::SYS_unlinkat),
allow_syscall(libc::SYS_wait4),
allow_syscall(libc::SYS_write),
allow_syscall(libc::SYS_writev),
])
}