[netdrvr] sfc: sfc: Add self-test support

Add a set of self-tests accessible thorugh ethtool.
Add hardware loopback and TX disable control code to support them.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c
index 9fd198442e8d..670622373ddf 100644
--- a/drivers/net/sfc/rx.c
+++ b/drivers/net/sfc/rx.c
@@ -19,6 +19,7 @@
 #include "rx.h"
 #include "efx.h"
 #include "falcon.h"
+#include "selftest.h"
 #include "workarounds.h"
 
 /* Number of RX descriptors pushed at once. */
@@ -683,6 +684,15 @@ void __efx_rx_packet(struct efx_channel *channel,
         struct sk_buff *skb;
         int lro = efx->net_dev->features & NETIF_F_LRO;
 
+        /* If we're in loopback test, then pass the packet directly to the
+         * loopback layer, and free the rx_buf here
+         */
+        if (unlikely(efx->loopback_selftest)) {
+                efx_loopback_rx_packet(efx, rx_buf->data, rx_buf->len);
+                efx_free_rx_buffer(efx, rx_buf);
+                goto done;
+        }
+
         if (rx_buf->skb) {
                 prefetch(skb_shinfo(rx_buf->skb));