ps3: reduce allocation size of rx skb buffers
Reduced allocation size for rx skb buffers, from 2308 bytes to
1356 per buffer.
Signed-off-by: Masakazu Mokuno <mokuno@sm.sony.co.jp>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/ps3_gelic_net.c b/drivers/net/ps3_gelic_net.c
index d596df9..13d1c0a 100644
--- a/drivers/net/ps3_gelic_net.c
+++ b/drivers/net/ps3_gelic_net.c
@@ -917,31 +917,60 @@
goto refill;
}
- if ((status != GELIC_NET_DESCR_COMPLETE) &&
- (status != GELIC_NET_DESCR_FRAME_END)) {
+ if (status == GELIC_NET_DESCR_BUFFER_FULL) {
+ /*
+ * Buffer full would occur if and only if
+ * the frame length was longer than the size of this
+ * descriptor's buffer. If the frame length was equal
+ * to or shorter than buffer'size, FRAME_END condition
+ * would occur.
+ * Anyway this frame was longer than the MTU,
+ * just drop it.
+ */
+ dev_info(ctodev(card), "overlength frame\n");
+ goto refill;
+ }
+ /*
+ * descriptoers any other than FRAME_END here should
+ * be treated as error.
+ */
+ if (status != GELIC_NET_DESCR_FRAME_END) {
dev_dbg(ctodev(card), "RX descriptor with state %x\n",
status);
goto refill;
}
/* ok, we've got a packet in descr */
- gelic_net_pass_skb_up(descr, card); /* 1: skb_up sccess */
-
+ gelic_net_pass_skb_up(descr, card);
refill:
- descr->next_descr_addr = 0; /* unlink the descr */
+ /*
+ * So that always DMAC can see the end
+ * of the descriptor chain to avoid
+ * from unwanted DMAC overrun.
+ */
+ descr->next_descr_addr = 0;
/* change the descriptor state: */
gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
- /* refill one desc
- * FIXME: this can fail, but for now, just leave this
- * descriptor without skb
+ /*
+ * this call can fail, but for now, just leave this
+ * decriptor without skb
*/
gelic_net_prepare_rx_descr(card, descr);
+
chain->head = descr;
chain->tail = descr->next;
+
+ /*
+ * Set this descriptor the end of the chain.
+ */
descr->prev->next_descr_addr = descr->bus_addr;
+ /*
+ * If dmac chain was met, DMAC stopped.
+ * thus re-enable it
+ */
if (dmac_chain_ended) {
card->rx_dma_restart_required = 1;
dev_dbg(ctodev(card), "reenable rx dma scheduled\n");