[SCSI] bnx2fc: Fix MTU issue by using static MTU

bnx2x now uses seperate MTUs for networking and FCoE. FCoE MTU is fixed to 2500
and bnx2fc now needs to match this logic by using FCOE_MTU instead of
netdev->mtu.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/bnx2fc/bnx2fc.h

@@ -89,6 +89,10 @@
 #define BNX2FC_ELSTM_XIDS		BNX2FC_CAN_QUEUE
 #define BNX2FC_MIN_PAYLOAD		256
 #define BNX2FC_MAX_PAYLOAD		2048
+#define BNX2FC_MFS			\
+			(BNX2FC_MAX_PAYLOAD + sizeof(struct fc_frame_header))
+#define BNX2FC_MINI_JUMBO_MTU		2500
+
 
 #define BNX2FC_RQ_BUF_SZ		256
 #define BNX2FC_RQ_BUF_LOG_SZ		(ilog2(BNX2FC_RQ_BUF_SZ))
@@ -128,7 +132,6 @@
 
 #define BNX2FC_WAIT_CNT			120
 #define BNX2FC_FW_TIMEOUT		(3 * HZ)
-
 #define PORT_MAX			2
 
 #define CMD_SCSI_STATUS(Cmnd)		((Cmnd)->SCp.Status)

drivers/scsi/bnx2fc/bnx2fc_fcoe.c

@@ -661,31 +661,6 @@ static int bnx2fc_shost_config(struct fc_lport *lport, struct device *dev)
 	return 0;
 }
 
-static int  bnx2fc_mfs_update(struct fc_lport *lport)
-{
-	struct fcoe_port *port = lport_priv(lport);
-	struct bnx2fc_hba *hba = port->priv;
-	struct net_device *netdev = hba->netdev;
-	u32 mfs;
-	u32 max_mfs;
-
-	mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
-			     sizeof(struct fcoe_crc_eof));
-	max_mfs = BNX2FC_MAX_PAYLOAD + sizeof(struct fc_frame_header);
-	BNX2FC_HBA_DBG(lport, "mfs = %d, max_mfs = %d\n", mfs, max_mfs);
-	if (mfs > max_mfs)
-		mfs = max_mfs;
-
-	/* Adjust mfs to be a multiple of 256 bytes */
-	mfs = (((mfs - sizeof(struct fc_frame_header)) / BNX2FC_MIN_PAYLOAD) *
-			BNX2FC_MIN_PAYLOAD);
-	mfs = mfs + sizeof(struct fc_frame_header);
-
-	BNX2FC_HBA_DBG(lport, "Set MFS = %d\n", mfs);
-	if (fc_set_mfs(lport, mfs))
-		return -EINVAL;
-	return 0;
-}
 static void bnx2fc_link_speed_update(struct fc_lport *lport)
 {
 	struct fcoe_port *port = lport_priv(lport);
@@ -754,7 +729,7 @@ static int bnx2fc_net_config(struct fc_lport *lport)
 	    !hba->phys_dev->ethtool_ops->get_pauseparam)
 		return -EOPNOTSUPP;
 
-	if (bnx2fc_mfs_update(lport))
+	if (fc_set_mfs(lport, BNX2FC_MFS))
 		return -EINVAL;
 
 	skb_queue_head_init(&port->fcoe_pending_queue);
@@ -825,14 +800,6 @@ static void bnx2fc_indicate_netevent(void *context, unsigned long event)
 		if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state))
 			printk(KERN_ERR "indicate_netevent: "\
 					"adapter is not UP!!\n");
-		/* fall thru to update mfs if MTU has changed */
-	case NETDEV_CHANGEMTU:
-		BNX2FC_HBA_DBG(lport, "NETDEV_CHANGEMTU event\n");
-		bnx2fc_mfs_update(lport);
-		mutex_lock(&lport->lp_mutex);
-		list_for_each_entry(vport, &lport->vports, list)
-			bnx2fc_mfs_update(vport);
-		mutex_unlock(&lport->lp_mutex);
 		break;
 
 	case NETDEV_DOWN:

drivers/scsi/bnx2fc/bnx2fc_hwi.c

@@ -87,7 +87,7 @@ int bnx2fc_send_fw_fcoe_init_msg(struct bnx2fc_hba *hba)
 	fcoe_init1.task_list_pbl_addr_lo = (u32) hba->task_ctx_bd_dma;
 	fcoe_init1.task_list_pbl_addr_hi =
 				(u32) ((u64) hba->task_ctx_bd_dma >> 32);
-	fcoe_init1.mtu = hba->netdev->mtu;
+	fcoe_init1.mtu = BNX2FC_MINI_JUMBO_MTU;
 
 	fcoe_init1.flags = (PAGE_SHIFT <<
 				FCOE_KWQE_INIT1_LOG_PAGE_SIZE_SHIFT);