4 files changed, 25 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
index 3cf9df833cb4..6ebb55d6a98f 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
@@ -341,6 +341,7 @@ union db_prod {
 #define SGE_PAGE_SIZE		PAGE_SIZE
 #define SGE_PAGE_SHIFT		PAGE_SHIFT
 #define SGE_PAGE_ALIGN(addr)	PAGE_ALIGN((typeof(PAGE_SIZE))(addr))
+#define SGE_PAGES		(SGE_PAGE_SIZE * PAGES_PER_SGE)
 
 /* SGE ring related macros */
 #define NUM_RX_SGE_PAGES	2
@@ -1210,6 +1211,7 @@ struct bnx2x {
 #define ETH_MAX_JUMBO_PACKET_SIZE	9600
 /* TCP with Timestamp Option (32) + IPv6 (40) */
 #define ETH_MAX_TPA_HEADER_SIZE		72
+#define ETH_MIN_TPA_HEADER_SIZE		40
 
 	/* Max supported alignment is 256 (8 shift) */
 #define BNX2X_RX_ALIGN_SHIFT		min(8, L1_CACHE_SHIFT)
@@ -1329,6 +1331,8 @@ struct bnx2x {
 
 	u8			wol;
 
+	bool			gro_check;
+
 	int			rx_ring_size;
 
 	u16			tx_quick_cons_trip_int;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 0a45251edb8f..f82dfff58243 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -330,6 +330,16 @@ static void bnx2x_tpa_start(struct bnx2x_fastpath *fp, u16 queue,
 		u16 gro_size = le16_to_cpu(cqe->pkt_len_or_gro_seg_len);
 		tpa_info->full_page =
 			SGE_PAGE_SIZE * PAGES_PER_SGE / gro_size * gro_size;
+		/*
+		 * FW 7.2.16 BUG workaround:
+		 * if SGE size is (exactly) multiple gro_size
+		 * fw will place one less frag on SGE.
+		 * the calculation is done only for potentially
+		 * dangerous MTUs.
+		 */
+		if (unlikely(bp->gro_check))
+			if (!(SGE_PAGE_SIZE * PAGES_PER_SGE % gro_size))
+				tpa_info->full_page -= gro_size;
 		tpa_info->gro_size = gro_size;
 	}
 
@@ -3486,6 +3496,8 @@ int bnx2x_change_mtu(struct net_device *dev, int new_mtu)
 	 */
 	dev->mtu = new_mtu;
 
+	bp->gro_check = bnx2x_need_gro_check(new_mtu);
+
 	return bnx2x_reload_if_running(dev);
 }
 
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
index d2093ee9b85e..33aa7de24016 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
@@ -1504,6 +1504,13 @@ static inline bool bnx2x_mtu_allows_gro(int mtu)
 	 */
 	return mtu <= SGE_PAGE_SIZE && (U_ETH_SGL_SIZE * fpp) <= MAX_SKB_FRAGS;
 }
+
+static inline bool bnx2x_need_gro_check(int mtu)
+{
+	return (SGE_PAGES / (mtu - ETH_MAX_TPA_HEADER_SIZE - 1)) !=
+		(SGE_PAGES / (mtu - ETH_MIN_TPA_HEADER_SIZE + 1));
+}
+
 /**
  * bnx2x_bz_fp - zero content of the fastpath structure.
  *
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 816e7d42f61c..b4afef60a25b 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -10214,6 +10214,8 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
 	if (CHIP_IS_E3B0(bp))
 		bp->max_cos = BNX2X_MULTI_TX_COS_E3B0;
 
+	bp->gro_check = bnx2x_need_gro_check(bp->dev->mtu);
+
 	return rc;
 }