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[PULL,11/31] ftgmac100: fix multicast hash routine

Message ID 20180608124517.29475-12-peter.maydell@linaro.org
State New
Headers show
Series [PULL,01/31] arm_gicv3_kvm: kvm_dist_get/put: skip the registers banked by GICR | expand

Commit Message

Peter Maydell June 8, 2018, 12:44 p.m. UTC 
From: Cédric Le Goater <clg@kaod.org>

Based on the multicast hash calculation of the FTGMAC100 Linux driver.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180530061711.23673-4-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/net/ftgmac100.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/net/ftgmac100.c b/hw/net/ftgmac100.c
index abf80655f28..8a7f274dc11 100644
--- a/hw/net/ftgmac100.c
+++ b/hw/net/ftgmac100.c
@@ -776,8 +776,8 @@  static int ftgmac100_filter(FTGMAC100State *s, const uint8_t *buf, size_t len)
                 return 0;
             }
 
-            /* TODO: this does not seem to work for ftgmac100 */
-            mcast_idx = net_crc32(buf, ETH_ALEN) >> 26;
+            mcast_idx = net_crc32_le(buf, ETH_ALEN);
+            mcast_idx = (~(mcast_idx >> 2)) & 0x3f;
             if (!(s->math[mcast_idx / 32] & (1 << (mcast_idx % 32)))) {
                 return 0;
             }