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SubjectRe: [RFC PATCH v1 3/7] vhost/vsock: support MSG_EOR bit processing
On Mon, Jul 26, 2021 at 07:33:38PM +0300, Arseny Krasnov wrote:
>It works in the same way as 'end-of-message' bit: if packet has
>'EOM' bit, also check for 'EOR' bit.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> drivers/vhost/vsock.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index 3b55de70ac77..3e2b150f9c6f 100644
>--- a/drivers/vhost/vsock.c
>+++ b/drivers/vhost/vsock.c
>@@ -115,6 +115,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> size_t iov_len, payload_len;
> int head;
> bool restore_msg_eom_flag = false;
>+ bool restore_msg_eor_flag = false;

Since we now have 2 flags to potentially restore, we could use a single
variable (e.g. uint32_t flags_to_restore), initialized to 0.

We can set all the flags we need to restore and then simply put it
in or with the `pkt->hdr.flags` field.

> spin_lock_bh(&vsock->send_pkt_list_lock);
> if (list_empty(&vsock->send_pkt_list)) {
>@@ -188,6 +189,11 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) {
> pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
> restore_msg_eom_flag = true;
>+
>+ if (le32_to_cpu(pkt->hdr.flags & VIRTIO_VSOCK_SEQ_EOR)) {
^
Here it should be `le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR`

>+ pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
>+ restore_msg_eor_flag = true;
>+ }
> }
> }
>
>@@ -224,9 +230,13 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> * to send it with the next available buffer.
> */
> if (pkt->off < pkt->len) {
>- if (restore_msg_eom_flag)
>+ if (restore_msg_eom_flag) {
> pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
>
>+ if (restore_msg_eor_flag)
>+ pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
>+ }
>+

If we use a single variable, here we can simply do:

pkt->hdr.flags |= cpu_to_le32(flags_to_restore);

Stefano

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