[BNX2]: Fine-tune flow control on 5709.

Make use of the programmable high/low water marks in 5709 for
802.3 flow control.

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

2 files changed, 56 insertions, 6 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 8af63b4ec67d..bd31a4b9c3ad 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -992,6 +992,42 @@ bnx2_copper_linkup(struct bnx2 *bp)
         return 0;
 }
 
+static void
+bnx2_init_rx_context0(struct bnx2 *bp)
+{
+        u32 val, rx_cid_addr = GET_CID_ADDR(RX_CID);
+
+        val = BNX2_L2CTX_CTX_TYPE_CTX_BD_CHN_TYPE_VALUE;
+        val |= BNX2_L2CTX_CTX_TYPE_SIZE_L2;
+        val |= 0x02 << 8;
+
+        if (CHIP_NUM(bp) == CHIP_NUM_5709) {
+                u32 lo_water, hi_water;
+
+                if (bp->flow_ctrl & FLOW_CTRL_TX)
+                        lo_water = BNX2_L2CTX_LO_WATER_MARK_DEFAULT;
+                else
+                        lo_water = BNX2_L2CTX_LO_WATER_MARK_DIS;
+                if (lo_water >= bp->rx_ring_size)
+                        lo_water = 0;
+
+                hi_water = bp->rx_ring_size / 4;
+
+                if (hi_water <= lo_water)
+                        lo_water = 0;
+
+                hi_water /= BNX2_L2CTX_HI_WATER_MARK_SCALE;
+                lo_water /= BNX2_L2CTX_LO_WATER_MARK_SCALE;
+
+                if (hi_water > 0xf)
+                        hi_water = 0xf;
+                else if (hi_water == 0)
+                        lo_water = 0;
+                val |= lo_water | (hi_water << BNX2_L2CTX_HI_WATER_MARK_SHIFT);
+        }
+        bnx2_ctx_wr(bp, rx_cid_addr, BNX2_L2CTX_CTX_TYPE, val);
+}
+
 static int
 bnx2_set_mac_link(struct bnx2 *bp)
 {
@@ -1056,6 +1092,9 @@ bnx2_set_mac_link(struct bnx2 *bp)
         /* Acknowledge the interrupt. */
         REG_WR(bp, BNX2_EMAC_STATUS, BNX2_EMAC_STATUS_LINK_CHANGE);
 
+        if (CHIP_NUM(bp) == CHIP_NUM_5709)
+                bnx2_init_rx_context0(bp);
+
         return 0;
 }
 
@@ -4616,6 +4655,13 @@ bnx2_init_rx_ring(struct bnx2 *bp)
         bnx2_init_rxbd_rings(bp->rx_desc_ring, bp->rx_desc_mapping,
                              bp->rx_buf_use_size, bp->rx_max_ring);
 
+        bnx2_init_rx_context0(bp);
+
+        if (CHIP_NUM(bp) == CHIP_NUM_5709) {
+                val = REG_RD(bp, BNX2_MQ_MAP_L2_5);
+                REG_WR(bp, BNX2_MQ_MAP_L2_5, val | BNX2_MQ_MAP_L2_5_ARM);
+        }
+
         bnx2_ctx_wr(bp, rx_cid_addr, BNX2_L2CTX_PG_BUF_SIZE, 0);
         if (bp->rx_pg_ring_size) {
                 bnx2_init_rxbd_rings(bp->rx_pg_desc_ring,
@@ -4636,11 +4682,6 @@ bnx2_init_rx_ring(struct bnx2 *bp)
                         REG_WR(bp, BNX2_MQ_MAP_L2_3, BNX2_MQ_MAP_L2_3_DEFAULT);
         }
 
-        val = BNX2_L2CTX_CTX_TYPE_CTX_BD_CHN_TYPE_VALUE;
-        val |= BNX2_L2CTX_CTX_TYPE_SIZE_L2;
-        val |= 0x02 << 8;
-        bnx2_ctx_wr(bp, rx_cid_addr, BNX2_L2CTX_CTX_TYPE, val);
-
         val = (u64) bp->rx_desc_mapping[0] >> 32;
         bnx2_ctx_wr(bp, rx_cid_addr, BNX2_L2CTX_NX_BDHADDR_HI, val);
 
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index c5fe34013548..3aa0364942e2 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -348,6 +348,12 @@ 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_SCALE                   4
+#define BNX2_L2CTX_LO_WATER_MARK_DIS                     0
+#define BNX2_L2CTX_HI_WATER_MARK_SHIFT                   4
+#define BNX2_L2CTX_HI_WATER_MARK_SCALE                   16
+#define BNX2_L2CTX_WATER_MARKS_MSK                       0x000000ff
 #define BNX2_L2CTX_CTX_TYPE_SIZE_L2                      ((0x20/20)<<16)
 #define BNX2_L2CTX_CTX_TYPE_CTX_BD_CHN_TYPE              (0xf<<28)
 #define BNX2_L2CTX_CTX_TYPE_CTX_BD_CHN_TYPE_UNDEFINED    (0<<28)
@@ -4494,6 +4500,9 @@ struct l2_fhdr {
 #define BNX2_MQ_MAP_L2_3_ENA                             (0x1L<<31)
 #define BNX2_MQ_MAP_L2_3_DEFAULT                         0x82004646
 
+#define BNX2_MQ_MAP_L2_5                                0x00003d34
+#define BNX2_MQ_MAP_L2_5_ARM                             (0x3L<<26)
+
 /*
  *  tsch_reg definition
  *  offset: 0x4c00
@@ -6405,7 +6414,7 @@ struct l2_fhdr {
 
 #define RX_COPY_THRESH                  128
 
-#define BNX2_MISC_ENABLE_DEFAULT        0x7ffffff
+#define BNX2_MISC_ENABLE_DEFAULT        0x17ffffff
 
 #define DMA_READ_CHANS  5
 #define DMA_WRITE_CHANS 3