Improve mxge receive performance:

- Update to the latest (1.4.18) f/w.  This f/w introduces a new
  receive mode which allows us to use FreeBSD's physically discontinuous
  MJUM9BYTES clusters.

- Switch the driver from chaining MJUMPAGESIZE clusters to using
  MJUM9BYTES clusters to avoid mbuf chaining overheads.  Due to this
  change, people running obsolete f/w images will be limited to an MTU of
  PAGE_SIZE - 16.

- Add (disabled by default) support for Large Receive Offload.

Sponsored by: Myricom, Inc.

1 files changed, 11 insertions, 1 deletions

diff --git a/sys/dev/mxge/mxge_mcp.h b/sys/dev/mxge/mxge_mcp.h
index d5da5a5..9dae5b2 100644
--- a/sys/dev/mxge/mxge_mcp.h
+++ b/sys/dev/mxge/mxge_mcp.h
@@ -263,8 +263,18 @@ enum myri10ge_mcp_cmd_type {
   /* same than DMA_TEST (same args) but abort with UNALIGNED on unaligned
      chipset */
 
-  MXGEFW_CMD_UNALIGNED_STATUS
+  MXGEFW_CMD_UNALIGNED_STATUS,
   /* return data = boolean, true if the chipset is known to be unaligned */
+  
+  MXGEFW_CMD_ALWAYS_USE_N_BIG_BUFFERS,
+  /* data0 = number of big buffers to use.  It must be 0 or a power of 2.
+   * 0 indicates that the NIC consumes as many buffers as they are required
+   * for packet. This is the default behavior.
+   * A power of 2 number indicates that the NIC always uses the specified
+   * number of buffers for each big receive packet.
+   * It is up to the driver to ensure that this value is big enough for
+   * the NIC to be able to receive maximum-sized packets.
+   */
 };
 typedef enum myri10ge_mcp_cmd_type myri10ge_mcp_cmd_type_t;