PERFORCE change 93082 for review

[Olivier Houchard]

http://perforce.freebsd.org/chv.cgi?CH=93082

Change 93082 by cognet at cognet on 2006/03/10 00:06:58

	Split the received mbuf into two mbuf, for alignment constraints.

Affected files ...

.. //depot/projects/arm/src/sys/arm/at91/if_ate.c#35 edit

Differences ...

==== //depot/projects/arm/src/sys/arm/at91/if_ate.c#35 (text+ko) ====

@@ -74,7 +74,7 @@
 #include "miibus_if.h"
 
 #define ATE_MAX_TX_BUFFERS 2		/* We have ping-pong tx buffers */
-#define ATE_MAX_RX_BUFFERS 64
+#define ATE_MAX_RX_BUFFERS 8
 
 struct ate_softc
 {
@@ -579,7 +579,7 @@
 	struct ate_softc *sc = xsc;
 	int status;
 	int i;
-	struct mbuf *mb;
+	struct mbuf *mb, *tmp_mbuf;
 	bus_dma_segment_t seg;
 	int rx_stat;
 	int nsegs;
@@ -630,8 +630,6 @@
 			 * the new buffer is loaded for dma.
 			 */
 			sc->rx_mbuf[i] = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
-			sc->rx_mbuf[i]->m_len =
-			    sc->rx_mbuf[i]->m_pkthdr.len = MCLBYTES;
 			if (!sc->rx_mbuf[i]) {
 				printf("Failed to get another mbuf -- discarding packet\n");
 				sc->rx_mbuf[i] = mb;
@@ -642,6 +640,8 @@
 				    BUS_DMASYNC_PREWRITE);
 				continue;
 			}
+			sc->rx_mbuf[i]->m_len =
+			    sc->rx_mbuf[i]->m_pkthdr.len = MCLBYTES;
 			bus_dmamap_unload(sc->rxtag, sc->rx_map[i]);
 			if (bus_dmamap_load_mbuf_sg(sc->rxtag, sc->rx_map[i],
 			    sc->rx_mbuf[i], &seg, &nsegs, 0) != 0) {
@@ -657,6 +657,7 @@
 			mb->m_len = rx_stat & ETH_LEN_MASK;
 			mb->m_pkthdr.len = mb->m_len;
 			mb->m_pkthdr.rcvif = sc->ifp;
+			tmp_mbuf = m_copyup(mb, ETHER_HDR_LEN, 2);
 			/*
 			 * For the last buffer, set the wrap bit so
 			 * the controller restarts from the first
@@ -670,7 +671,7 @@
 			    BUS_DMASYNC_PREREAD);
 			bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
 			    BUS_DMASYNC_PREWRITE);
-			(*sc->ifp->if_input)(sc->ifp, mb);
+			(*sc->ifp->if_input)(sc->ifp, tmp_mbuf);
 		}
 	}
 	if (status & ETH_ISR_TCOM) {