net/cadence_gem: Implement SAR match bit in rx desc

Bit 27 of the RX buffer desc word 1 should be set when the packet was
accepted due to specific address register match. Implement.

This feature is absent from the Xilinx documentation (UG585) but the
behaviour is tested as accurate on real hardware.

Reported-by: Deepika Dhamija <deepika@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 7e3f26fc4ab244e8123efc12723e7164730abdcb.1386136219.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index dceafb5..58d9b63 100644 (file)
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -243,6 +243,7 @@
 
 #define R_DESC_1_RX_SAR_SHIFT           25
 #define R_DESC_1_RX_SAR_LENGTH          2
+#define R_DESC_1_RX_SAR_MATCH           (1 << 27)
 #define R_DESC_1_RX_UNICAST_HASH        (1 << 29)
 #define R_DESC_1_RX_MULTICAST_HASH      (1 << 30)
 #define R_DESC_1_RX_BROADCAST           (1 << 31)
@@ -345,6 +346,7 @@ static inline void rx_desc_set_sar(unsigned *desc, int sar_idx)
 {
     desc[1] = deposit32(desc[1], R_DESC_1_RX_SAR_SHIFT, R_DESC_1_RX_SAR_LENGTH,
                         sar_idx);
+    desc[1] |= R_DESC_1_RX_SAR_MATCH;
 }
 
 #define TYPE_CADENCE_GEM "cadence_gem"