| Message ID | 20210903123238.3273526-1-arseny.krasnov@kaspersky.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtio/vsock: introduce MSG_EOR flag for SEQPACKET | expand |
On Fri, Sep 03, 2021 at 03:32:35PM +0300, Arseny Krasnov wrote: >'MSG_EOR' handling has similar logic as 'MSG_EOM' - if bit present >in packet's header, reset it to 0. Then restore it back if packet >processing wasn't completed. Instead of bool variable for each >flag, bit mask variable was added: it has logical OR of 'MSG_EOR' >and 'MSG_EOM' if needed, to restore flags, this variable is ORed >with flags field of packet. > >Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com> >--- > drivers/vhost/vsock.c | 22 +++++++++++++--------- > 1 file changed, 13 insertions(+), 9 deletions(-) > >diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c >index feaf650affbe..938aefbc75ec 100644 >--- a/drivers/vhost/vsock.c >+++ b/drivers/vhost/vsock.c >@@ -114,7 +114,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > size_t nbytes; > size_t iov_len, payload_len; > int head; >- bool restore_flag = false; >+ u32 flags_to_restore = 0; > > spin_lock_bh(&vsock->send_pkt_list_lock); > if (list_empty(&vsock->send_pkt_list)) { >@@ -179,15 +179,20 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > * created dynamically and are initialized with header > * of current packet(except length). But in case of > * SOCK_SEQPACKET, we also must clear message delimeter >- * bit(VIRTIO_VSOCK_SEQ_EOM). Otherwise, instead of one >- * packet with delimeter(which marks end of message), >- * there will be sequence of packets with delimeter >- * bit set. After initialized header will be copied to >- * rx buffer, this bit will be restored. >+ * bit (VIRTIO_VSOCK_SEQ_EOM) and MSG_EOR bit >+ * (VIRTIO_VSOCK_SEQ_EOR) if set. Otherwise, >+ * there will be sequence of packets with these >+ * bits set. After initialized header will be copied to >+ * rx buffer, these required bits will be restored. > */ > if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) { > pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); >- restore_flag = true; >+ flags_to_restore |= VIRTIO_VSOCK_SEQ_EOM; >+ >+ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) { >+ pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); >+ flags_to_restore |= VIRTIO_VSOCK_SEQ_EOR; >+ } > } > } > >@@ -224,8 +229,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > * to send it with the next available buffer. > */ > if (pkt->off < pkt->len) { >- if (restore_flag) >- pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); >+ pkt->hdr.flags |= cpu_to_le32(flags_to_restore); > > /* We are queueing the same virtio_vsock_pkt to > handle > * the remaining bytes, and we want to deliver it >-- >2.25.1 > Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index feaf650affbe..938aefbc75ec 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -114,7 +114,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, size_t nbytes; size_t iov_len, payload_len; int head; - bool restore_flag = false; + u32 flags_to_restore = 0; spin_lock_bh(&vsock->send_pkt_list_lock); if (list_empty(&vsock->send_pkt_list)) { @@ -179,15 +179,20 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, * created dynamically and are initialized with header * of current packet(except length). But in case of * SOCK_SEQPACKET, we also must clear message delimeter - * bit(VIRTIO_VSOCK_SEQ_EOM). Otherwise, instead of one - * packet with delimeter(which marks end of message), - * there will be sequence of packets with delimeter - * bit set. After initialized header will be copied to - * rx buffer, this bit will be restored. + * bit (VIRTIO_VSOCK_SEQ_EOM) and MSG_EOR bit + * (VIRTIO_VSOCK_SEQ_EOR) if set. Otherwise, + * there will be sequence of packets with these + * bits set. After initialized header will be copied to + * rx buffer, these required bits will be restored. */ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) { pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); - restore_flag = true; + flags_to_restore |= VIRTIO_VSOCK_SEQ_EOM; + + if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) { + pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); + flags_to_restore |= VIRTIO_VSOCK_SEQ_EOR; + } } } @@ -224,8 +229,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, * to send it with the next available buffer. */ if (pkt->off < pkt->len) { - if (restore_flag) - pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); + pkt->hdr.flags |= cpu_to_le32(flags_to_restore); /* We are queueing the same virtio_vsock_pkt to handle * the remaining bytes, and we want to deliver it
'MSG_EOR' handling has similar logic as 'MSG_EOM' - if bit present in packet's header, reset it to 0. Then restore it back if packet processing wasn't completed. Instead of bool variable for each flag, bit mask variable was added: it has logical OR of 'MSG_EOR' and 'MSG_EOM' if needed, to restore flags, this variable is ORed with flags field of packet. Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com> --- drivers/vhost/vsock.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)