bnx2x: nvram enables dropless flow control

It is now possible to enable dropless flow control via nvram.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 31 insertions, 4 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
index 641d8847c326..03647bf3ddb9 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
@@ -1488,7 +1488,7 @@ struct bnx2x {
 
         int                     qm_cid_count;
 
-        int                     dropless_fc;
+        bool                    dropless_fc;
 
         void                    *t2;
         dma_addr_t              t2_mapping;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
index 9a51d4970ad5..3369a50ac6b4 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
@@ -500,7 +500,15 @@ struct port_hw_cfg {		    /* port 0: 0x12c  port 1: 0x2bc */
         u32 e3_cmn_pin_cfg1;                                /* 0x170 */
         #define PORT_HW_CFG_E3_OVER_CURRENT_MASK            0x000000FF
         #define PORT_HW_CFG_E3_OVER_CURRENT_SHIFT                    0
-        u32 reserved0[7];                                   /* 0x174 */
+
+        /*  pause on host ring */
+        u32 generic_features;                               /* 0x174 */
+        #define PORT_HW_CFG_PAUSE_ON_HOST_RING_MASK                   0x00000001
+        #define PORT_HW_CFG_PAUSE_ON_HOST_RING_SHIFT                  0
+        #define PORT_HW_CFG_PAUSE_ON_HOST_RING_DISABLED               0x00000000
+        #define PORT_HW_CFG_PAUSE_ON_HOST_RING_ENABLED                0x00000001
+
+        u32 reserved0[6];                                   /* 0x178 */
 
         u32 aeu_int_mask;                                   /* 0x190 */
 
@@ -1518,12 +1526,13 @@ enum mf_cfg_afex_vlan_mode {
 /* This structure is not applicable and should not be accessed on 57711 */
 struct func_ext_cfg {
         u32 func_cfg;
-        #define MACP_FUNC_CFG_FLAGS_MASK                0x000000FF
+        #define MACP_FUNC_CFG_FLAGS_MASK                0x0000007F
         #define MACP_FUNC_CFG_FLAGS_SHIFT               0
         #define MACP_FUNC_CFG_FLAGS_ENABLED             0x00000001
         #define MACP_FUNC_CFG_FLAGS_ETHERNET            0x00000002
         #define MACP_FUNC_CFG_FLAGS_ISCSI_OFFLOAD       0x00000004
         #define MACP_FUNC_CFG_FLAGS_FCOE_OFFLOAD        0x00000008
+        #define MACP_FUNC_CFG_PAUSE_ON_HOST_RING        0x00000080
 
         u32 iscsi_mac_addr_upper;
         u32 iscsi_mac_addr_lower;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 62fcf0f0e72a..89b3d10e1575 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -10641,8 +10641,26 @@ static void __devinit bnx2x_get_mac_hwinfo(struct bnx2x *bp)
                         "bad Ethernet MAC address configuration: %pM\n"
                         "change it manually before bringing up the appropriate network interface\n",
                         bp->dev->dev_addr);
+}
 
+static bool __devinit bnx2x_get_dropless_info(struct bnx2x *bp)
+{
+        int tmp;
+        u32 cfg;
 
+        if (IS_MF(bp) && !CHIP_IS_E1x(bp)) {
+                /* Take function: tmp = func */
+                tmp = BP_ABS_FUNC(bp);
+                cfg = MF_CFG_RD(bp, func_ext_config[tmp].func_cfg);
+                cfg = !!(cfg & MACP_FUNC_CFG_PAUSE_ON_HOST_RING);
+        } else {
+                /* Take port: tmp = port */
+                tmp = BP_PORT(bp);
+                cfg = SHMEM_RD(bp,
+                               dev_info.port_hw_config[tmp].generic_features);
+                cfg = !!(cfg & PORT_HW_CFG_PAUSE_ON_HOST_RING_ENABLED);
+        }
+        return cfg;
 }
 
 static int __devinit bnx2x_get_hwinfo(struct bnx2x *bp)
@@ -11063,7 +11081,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
         if (CHIP_IS_E1(bp))
                 bp->dropless_fc = 0;
         else
-                bp->dropless_fc = dropless_fc;
+                bp->dropless_fc = dropless_fc | bnx2x_get_dropless_info(bp);
 
         bp->mrrs = mrrs;