bnx2: Adjust flow control water marks.

The current water marks are too high and can cause unnecessary flow
control frames.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 063f283..dbe487f 100644 (file)
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -1277,7 +1277,7 @@ bnx2_init_rx_context(struct bnx2 *bp, u32 cid)
                if (lo_water >= bp->rx_ring_size)
                        lo_water = 0;
 
-               hi_water = bp->rx_ring_size / 4;
+               hi_water = min_t(int, bp->rx_ring_size / 4, lo_water + 16);
 
                if (hi_water <= lo_water)
                        lo_water = 0;

diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index b860fbb..cd4b0e4 100644 (file)
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -349,7 +349,7 @@ struct l2_fhdr {
 #define BNX2_L2CTX_BD_PRE_READ                         0x00000000
 #define BNX2_L2CTX_CTX_SIZE                            0x00000000
 #define BNX2_L2CTX_CTX_TYPE                            0x00000000
-#define BNX2_L2CTX_LO_WATER_MARK_DEFAULT                32
+#define BNX2_L2CTX_LO_WATER_MARK_DEFAULT                4
 #define BNX2_L2CTX_LO_WATER_MARK_SCALE                  4
 #define BNX2_L2CTX_LO_WATER_MARK_DIS                    0
 #define BNX2_L2CTX_HI_WATER_MARK_SHIFT                  4