vtnet: Adjust for ethernet alignment.

If the header that we add to the packet's size is 0 % 4 and we're
strictly aligning, then we need to adjust where we store the header so
the packet that follows will have it's struct ip header properly
aligned.  We do this on allocation (and when we check the length of the
mbufs in the lro_nomrg case). We can't just adjust the clustersz in the
softc, because it's also used to allocate the mbufs and it needs to be
the proper size for that. Since we otherwise use the size of the mbuf
(or sometimes the smaller size of the received packet) to compute how
much we can buffer, this ensures no overflows. The 2 byte adjustment
also does not affect how many packets we can receive in the lro_nomrg
case.

PR:			271288
Sponsored by:		Netflix
Reviewed by:		bryanv
Differential Revision:	https://reviews.freebsd.org/D43224

(cherry picked from commit 3be59adbb5a2ae7600d46432d3bc82286e507e95)

1 files changed, 21 insertions, 0 deletions

diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c
index 9737e964a591..3945826f91a0 100644
--- a/sys/dev/virtio/network/if_vtnet.c
+++ b/sys/dev/virtio/network/if_vtnet.c
@@ -1545,6 +1545,15 @@ vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
 		}
 
 		m->m_len = size;
+#ifndef __NO_STRICT_ALIGNMENT
+		/*
+		 * Need to offset the mbuf if the header we're going to add
+		 * will misalign.
+		 */
+		if (sc->vtnet_hdr_size % 4 == 0) {
+			m_adj(m, ETHER_ALIGN);
+		}
+#endif
 		if (m_head != NULL) {
 			m_tail->m_next = m;
 			m_tail = m;
@@ -1571,6 +1580,14 @@ vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0,
 
 	sc = rxq->vtnrx_sc;
 	clustersz = sc->vtnet_rx_clustersz;
+#ifndef __NO_STRICT_ALIGNMENT
+	/*
+	 * Need to offset the mbuf if the header we're going to add will
+	 * misalign, account for that here.
+	 */
+	if (sc->vtnet_hdr_size % 4 == 0)
+		clustersz -= ETHER_ALIGN;
+#endif
 
 	m_prev = NULL;
 	m_tail = NULL;
@@ -1694,6 +1711,10 @@ vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m)
 	header_inlined = vtnet_modern(sc) ||
 	    (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */
 
+	/*
+	 * Note: The mbuf has been already adjusted when we allocate it if we
+	 * have to do strict alignment.
+	 */
 	if (header_inlined)
 		error = sglist_append_mbuf(sg, m);
 	else {