cxgbe: fix minimum descriptors requirement

Most dpdk examples and apps seem to initialize with a minimum of 128 rx
descriptors and 512 tx descriptors for queue setup.  However, CXGBE PMD
enforces a minimum of 1024 descriptors.  This causes the dpdk stack
to return -EINVAL because the apps do not request the minimum required.

The fix is to relax this enforcing in CXGBE PMD. A minimum of 128
descriptors seems to be a good number with the least impact on the
performance.

Fixes: 946c9ed95616 ("cxgbe: get descriptor limits")

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>

diff --git a/drivers/net/cxgbe/cxgbe.h b/drivers/net/cxgbe/cxgbe.h
index adc0d92..0201c99 100644 (file)
--- a/drivers/net/cxgbe/cxgbe.h
+++ b/drivers/net/cxgbe/cxgbe.h
@@ -37,7 +37,7 @@
 #include "common.h"
 #include "t4_regs.h"
 
-#define CXGBE_MIN_RING_DESC_SIZE      1024 /* Min TX/RX descriptor ring size */
+#define CXGBE_MIN_RING_DESC_SIZE      128  /* Min TX/RX descriptor ring size */
 #define CXGBE_MAX_RING_DESC_SIZE      4096 /* Max TX/RX descriptor ring size */
 
 #define CXGBE_DEFAULT_TX_DESC_SIZE    1024 /* Default TX ring size */