bnx2x: dcb - send all unmapped priorities to same COS as L2

As a result of DCBX negotiation some priorities maybe untouched and still
unmapped to any COS; instead of sending them to COS0 we assign them
to the same COS as L2 traffic - to avoid collisions with storage class of
service.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 33 insertions, 6 deletions

diff --git a/drivers/net/bnx2x/bnx2x_dcb.c b/drivers/net/bnx2x/bnx2x_dcb.c
index d028794a2298..a4ea35f6a456 100644
--- a/drivers/net/bnx2x/bnx2x_dcb.c
+++ b/drivers/net/bnx2x/bnx2x_dcb.c
@@ -19,15 +19,13 @@
 #include <linux/netdevice.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/rtnetlink.h>
+#include <net/dcbnl.h>
 
 #include "bnx2x.h"
 #include "bnx2x_cmn.h"
 #include "bnx2x_dcb.h"
 
-#ifdef BCM_DCBNL
-#include <linux/rtnetlink.h>
-#endif
-
 /* forward declarations of dcbx related functions */
 static int bnx2x_dcbx_stop_hw_tx(struct bnx2x *bp);
 static void bnx2x_pfc_set_pfc(struct bnx2x *bp);
@@ -333,6 +331,32 @@ static void  bnx2x_dcbx_get_pfc_feature(struct bnx2x *bp,
         }
 }
 
+/* maps unmapped priorities to to the same COS as L2 */
+static void bnx2x_dcbx_map_nw(struct bnx2x *bp)
+{
+        int i;
+        u32 unmapped = (1 << MAX_PFC_PRIORITIES) - 1; /* all ones */
+        u32 *ttp = bp->dcbx_port_params.app.traffic_type_priority;
+        u32 nw_prio = 1 << ttp[LLFC_TRAFFIC_TYPE_NW];
+        struct bnx2x_dcbx_cos_params *cos_params =
+                        bp->dcbx_port_params.ets.cos_params;
+
+        /* get unmapped priorities by clearing mapped bits */
+        for (i = 0; i < LLFC_DRIVER_TRAFFIC_TYPE_MAX; i++)
+                unmapped &= ~(1 << ttp[i]);
+
+        /* find cos for nw prio and extend it with unmapped */
+        for (i = 0; i < ARRAY_SIZE(bp->dcbx_port_params.ets.cos_params); i++) {
+                if (cos_params[i].pri_bitmask & nw_prio) {
+                        /* extend the bitmask with unmapped */
+                        DP(NETIF_MSG_LINK,
+                           "cos %d extended with 0x%08x", i, unmapped);
+                        cos_params[i].pri_bitmask |= unmapped;
+                        break;
+                }
+        }
+}
+
 static void bnx2x_get_dcbx_drv_param(struct bnx2x *bp,
                                      struct dcbx_features *features,
                                      u32 error)
@@ -342,6 +366,8 @@ static void bnx2x_get_dcbx_drv_param(struct bnx2x *bp,
         bnx2x_dcbx_get_pfc_feature(bp, &features->pfc, error);
 
         bnx2x_dcbx_get_ets_feature(bp, &features->ets, error);
+
+        bnx2x_dcbx_map_nw(bp);
 }
 
 #define DCBX_LOCAL_MIB_MAX_TRY_READ             (100)
@@ -682,6 +708,8 @@ static inline void bnx2x_dcbx_update_tc_mapping(struct bnx2x *bp)
                         if (bp->dcbx_port_params.ets.cos_params[cos].pri_bitmask
                             & (1 << prio)) {
                                 bp->prio_to_cos[prio] = cos;
+                                DP(NETIF_MSG_LINK,
+                                   "tx_mapping %d --> %d\n", prio, cos);
                         }
                 }
         }
@@ -749,7 +777,7 @@ void bnx2x_dcbx_set_params(struct bnx2x *bp, u32 state)
                 DP(NETIF_MSG_LINK, "BNX2X_DCBX_STATE_TX_RELEASED\n");
                 bnx2x_fw_command(bp, DRV_MSG_CODE_DCBX_PMF_DRV_OK, 0);
 #ifdef BCM_DCBNL
-                /**
+                /*
                  * Send a notification for the new negotiated parameters
                  */
                 dcbnl_cee_notify(bp->dev, RTM_GETDCB, DCB_CMD_CEE_GET, 0, 0);
@@ -1732,7 +1760,6 @@ static void bnx2x_dcbx_fill_cos_params(struct bnx2x *bp,
                                                           pri_join_mask,
                                                           num_of_dif_pri);
 
-
         for (i = 0; i < cos_data.num_of_cos ; i++) {
                 struct bnx2x_dcbx_cos_params *p =
                         &bp->dcbx_port_params.ets.cos_params[i];