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Subject: socsvn commit: r307052 - soc2016/vincenzo/head/usr.sbin/bhyve
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Author: vincenzo
Date: Mon Aug  1 08:02:11 2016
New Revision: 307052
URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=307052

Log:
   pci_vtnet_proctx: optimize computation of plen and tlen

Modified:
  soc2016/vincenzo/head/usr.sbin/bhyve/pci_virtio_net.c

Modified: soc2016/vincenzo/head/usr.sbin/bhyve/pci_virtio_net.c
==============================================================================
--- soc2016/vincenzo/head/usr.sbin/bhyve/pci_virtio_net.c	Mon Aug  1 08:01:35 2016	(r307051)
+++ soc2016/vincenzo/head/usr.sbin/bhyve/pci_virtio_net.c	Mon Aug  1 08:02:11 2016	(r307052)
@@ -147,7 +147,7 @@
 	struct virtio_net_config vsc_config;
 
 	pthread_mutex_t	rx_mtx;
-	int		rx_in_progress;
+	int		rx_in_progress; /* XXX-VM: useless. */
 	int		rx_vhdrlen;
 	int		rx_merge;	/* merged rx bufs in use */
 
@@ -620,12 +620,11 @@
 	 */
 	n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);
 	assert(n >= 1 && n <= VTNET_MAXSEGS);
-	plen = 0;
-	tlen = iov[0].iov_len;
-	for (i = 1; i < n; i++) {
-		plen += iov[i].iov_len;
+	tlen = 0;
+	for (i = 0; i < n; i++) {
 		tlen += iov[i].iov_len;
 	}
+	plen = tlen - iov[0].iov_len;
 
 	DPRINTF(("virtio: packet send, %d bytes, %d segs\n\r", plen, n));
 	sc->pci_vtnet_tx(sc, &iov[1], n - 1, plen);