[Bug 199174] em tx and rx hang

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199174

--- Comment #31 from Sean Bruno <sbruno at FreeBSD.org> ---
(In reply to david.keller from comment #30)
I just tested an alignment of 128 and I don't see any changes to behavior.  I
still get a lockup with TSO enabled.

@@ -3350,13 +3356,13 @@
         * Setup DMA descriptor areas.
         */
        if ((error = bus_dma_tag_create(bus_get_dma_tag(dev),
-                              1, 0,                    /* alignment, bounds */
+                              128, 0,                  /* alignment, bounds */
                               BUS_SPACE_MAXADDR,       /* lowaddr */
                               BUS_SPACE_MAXADDR,       /* highaddr */
                               NULL, NULL,              /* filter, filterarg */

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