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>

1 files changed, 37 insertions, 8 deletions

diff --git a/drivers/net/ps3_gelic_net.c b/drivers/net/ps3_gelic_net.c
index d596df987585..13d1c0a2a25f 100644
--- a/drivers/net/ps3_gelic_net.c
+++ b/drivers/net/ps3_gelic_net.c
@@ -917,31 +917,60 @@ static int gelic_net_decode_one_descr(struct gelic_net_card *card)
                 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");