s390: scatter-gather for inbound traffic in qeth driver

For large incoming packets > PAGE_SIZE/2 qeth creates a fragmented skb
by adding pointers to qdio pages to the fragment list of the skb.
This avoids allocating big chunks of consecutive memory. Also copying
data from the qdio buffer to the skb is economized.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/s390/net/qeth_proc.c b/drivers/s390/net/qeth_proc.c
index 89d56c8ecdd2..f1ff165a5e05 100644
--- a/drivers/s390/net/qeth_proc.c
+++ b/drivers/s390/net/qeth_proc.c
@@ -212,6 +212,12 @@ qeth_perf_procfile_seq_show(struct seq_file *s, void *it)
                       "  Skb fragments sent in SG mode          : %u\n\n",
                       card->perf_stats.sg_skbs_sent,
                       card->perf_stats.sg_frags_sent);
+        seq_printf(s, "  Skbs received in SG mode               : %u\n"
+                      "  Skb fragments received in SG mode      : %u\n"
+                      "  Page allocations for rx SG mode        : %u\n\n",
+                      card->perf_stats.sg_skbs_rx,
+                      card->perf_stats.sg_frags_rx,
+                      card->perf_stats.sg_alloc_page_rx);
         seq_printf(s, "  large_send tx (in Kbytes)              : %u\n"
                       "  large_send count                       : %u\n\n",
                       card->perf_stats.large_send_bytes >> 10,