be2net: Fix a bug in Rx buffer posting

The numPosted field in the ERX Doorbell register is 8-bits wide.
So the max buffers that we can post at a time is 255 and not 256
which we are doing currently.

Signed-off-by: Ajit Khaparde <ajit.khaparde@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 27b9fe99a9bd..204ec43438c4 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -97,6 +97,7 @@
 #define BE_NAPI_WEIGHT          64
 #define MAX_RX_POST             BE_NAPI_WEIGHT /* Frags posted at a time */
 #define RX_FRAGS_REFILL_WM      (RX_Q_LEN - MAX_RX_POST)
+#define MAX_NUM_POST_ERX_DB     255u
 
 #define MAX_VFS                 30 /* Max VFs supported by BE3 FW */
 #define FW_VER_LEN              32
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index e6b790f0d9dc..ad2b5094a498 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -2032,7 +2032,7 @@ static void be_post_rx_frags(struct be_rx_obj *rxo, gfp_t gfp, u32 frags_needed)
                 if (rxo->rx_post_starved)
                         rxo->rx_post_starved = false;
                 do {
-                        notify = min(256u, posted);
+                        notify = min(MAX_NUM_POST_ERX_DB, posted);
                         be_rxq_notify(adapter, rxq->id, notify);
                         posted -= notify;
                 } while (posted);