cxgb4: Check alignment constraint for T6

Update the check for setting  IPV4 filters and align filter_id
to multiple of 2, only for IPv6 filters in case of T6.

Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
index 6829de9..677a3ba 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -1189,6 +1189,7 @@ int __cxgb4_set_filter(struct net_device *dev, int filter_id,
                       struct filter_ctx *ctx)
 {
        struct adapter *adapter = netdev2adap(dev);
+       unsigned int chip_ver = CHELSIO_CHIP_VERSION(adapter->params.chip);
        unsigned int max_fidx, fidx;
        struct filter_entry *f;
        u32 iconf;
@@ -1225,12 +1226,18 @@ int __cxgb4_set_filter(struct net_device *dev, int filter_id,
         * insertion.
         */
        if (fs->type == 0) { /* IPv4 */
-               /* If our IPv4 filter isn't being written to a
-                * multiple of four filter index and there's an IPv6
-                * filter at the multiple of 4 base slot, then we
-                * prevent insertion.
+               /* For T6, If our IPv4 filter isn't being written to a
+                * multiple of two filter index and there's an IPv6
+                * filter at the multiple of 2 base slot, then we need
+                * to delete that IPv6 filter ...
+                * For adapters below T6, IPv6 filter occupies 4 entries.
+                * Hence we need to delete the filter in multiple of 4 slot.
                 */
-               fidx = filter_id & ~0x3;
+               if (chip_ver < CHELSIO_T6)
+                       fidx = filter_id & ~0x3;
+               else
+                       fidx = filter_id & ~0x1;
+
                if (fidx != filter_id &&
                    adapter->tids.ftid_tab[fidx].fs.type) {
                        f = &adapter->tids.ftid_tab[fidx];