LSO fix for vmxnet3s for Solaris.

[Mike <mic...@ne...>]

Good day.

  While trying to test vmxnet3s's LSO functionality under
Illumos (it is an OpenSolaris-based OS), I noticed, that
throughput was dramatically slow - about 200-300 Kbits/Sec.
Investigation led me to the fact that HW_LSO flag is resolved
in a wrong way in '

  Here is the patch that fixes the problem:


@@ -103,13 +103,19 @@ vmxnet3_tx_prepare_offload(vmxnet3_softc_t *dp,
                            mblk_t *mp)
 {
    int ret = 0;
-   uint32_t start, stuff, value, flags;
+   uint32_t start, stuff, value, flags, lsoflags, mss;
 
    ol->om = VMXNET3_OM_NONE;
    ol->hlen = 0;
    ol->msscof = 0;
 
    hcksum_retrieve(mp, NULL, NULL, &start, &stuff, NULL, &value,
&flags);
+
+   mac_lso_get(mp, &mss, &lsoflags);
+   if (lsoflags & HW_LSO) {
+           flags |= HW_LSO;
+   }
+


Sincerely,
Michael Tsymbalyuk