tile: remove dead is_dup_ack() function from tilepro net driver

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/tile/tilepro.c b/drivers/net/ethernet/tile/tilepro.c
index 2f4b7b9..fd17af5 100644 (file)
--- a/drivers/net/ethernet/tile/tilepro.c
+++ b/drivers/net/ethernet/tile/tilepro.c
@@ -89,9 +89,6 @@
 /* ISSUE: This has not been thoroughly tested (except at 1500). */
 #define TILE_NET_MTU 1500
 
-/* Define this to collapse "duplicate" acks. */
-/* #define IGNORE_DUP_ACKS */
-
 /* HACK: Define this to verify incoming packets. */
 /* #define TILE_NET_VERIFY_INGRESS */
 
@@ -625,79 +622,6 @@ static void tile_net_handle_egress_timer(unsigned long arg)
 }
 
 
-#ifdef IGNORE_DUP_ACKS
-
-/*
- * Help detect "duplicate" ACKs.  These are sequential packets (for a
- * given flow) which are exactly 66 bytes long, sharing everything but
- * ID=2@0x12, Hsum=2@0x18, Ack=4@0x2a, WinSize=2@0x30, Csum=2@0x32,
- * Tstamps=10@0x38.  The ID's are +1, the Hsum's are -1, the Ack's are
- * +N, and the Tstamps are usually identical.
- *
- * NOTE: Apparently truly duplicate acks (with identical "ack" values),
- * should not be collapsed, as they are used for some kind of flow control.
- */
-static bool is_dup_ack(char *s1, char *s2, unsigned int len)
-{
-       int i;
-
-       unsigned long long ignorable = 0;
-
-       /* Identification. */
-       ignorable |= (1ULL << 0x12);
-       ignorable |= (1ULL << 0x13);
-
-       /* Header checksum. */
-       ignorable |= (1ULL << 0x18);
-       ignorable |= (1ULL << 0x19);
-
-       /* ACK. */
-       ignorable |= (1ULL << 0x2a);
-       ignorable |= (1ULL << 0x2b);
-       ignorable |= (1ULL << 0x2c);
-       ignorable |= (1ULL << 0x2d);
-
-       /* WinSize. */
-       ignorable |= (1ULL << 0x30);
-       ignorable |= (1ULL << 0x31);
-
-       /* Checksum. */
-       ignorable |= (1ULL << 0x32);
-       ignorable |= (1ULL << 0x33);
-
-       for (i = 0; i < len; i++, ignorable >>= 1) {
-
-               if ((ignorable & 1) || (s1[i] == s2[i]))
-                       continue;
-
-#ifdef TILE_NET_DEBUG
-               /* HACK: Mention non-timestamp diffs. */
-               if (i < 0x38 && i != 0x2f &&
-                   net_ratelimit())
-                       pr_info("Diff at 0x%x\n", i);
-#endif
-
-               return false;
-       }
-
-#ifdef TILE_NET_NO_SUPPRESS_DUP_ACKS
-       /* HACK: Do not suppress truly duplicate ACKs. */
-       /* ISSUE: Is this actually necessary or helpful? */
-       if (s1[0x2a] == s2[0x2a] &&
-           s1[0x2b] == s2[0x2b] &&
-           s1[0x2c] == s2[0x2c] &&
-           s1[0x2d] == s2[0x2d]) {
-               return false;
-       }
-#endif
-
-       return true;
-}
-
-#endif
-
-
-
 static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
 {
        struct tile_netio_queue *queue = &info->queue;