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