bnx2x: Manual setting for MRRS

Allows better debug capabilities if the user wants to force an MRRS value
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x.h

@@ -864,6 +864,7 @@ struct bnx2x {
 
 	int			pm_cap;
 	int			pcie_cap;
+	int			mrrs;
 
 	struct delayed_work	sp_task;
 	struct work_struct	reset_task;

drivers/net/bnx2x_init.h

@@ -572,7 +572,12 @@ static void bnx2x_init_pxp(struct bnx2x *bp)
 			     bp->pcie_cap + PCI_EXP_DEVCTL, &devctl);
 	DP(NETIF_MSG_HW, "read 0x%x from devctl\n", devctl);
 	w_order = ((devctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5);
-	r_order = ((devctl & PCI_EXP_DEVCTL_READRQ) >> 12);
+	if (bp->mrrs == -1)
+		r_order = ((devctl & PCI_EXP_DEVCTL_READRQ) >> 12);
+	else {
+		DP(NETIF_MSG_HW, "force read order to %d\n", bp->mrrs);
+		r_order = bp->mrrs;
+	}
 
 	if (r_order > MAX_RD_ORD) {
 		DP(NETIF_MSG_HW, "read order of %d  order adjusted to %d\n",

drivers/net/bnx2x_main.c

@@ -88,6 +88,11 @@ module_param(int_mode, int, 0);
 MODULE_PARM_DESC(int_mode, " Force interrupt mode (1 INT#x; 2 MSI)");
 
 module_param(poll, int, 0);
+
+static int mrrs = -1;
+module_param(mrrs, int, 0);
+MODULE_PARM_DESC(mrrs, " Force Max Read Req Size (0..3) (for debug)");
+
 module_param(debug, int, 0);
 MODULE_PARM_DESC(disable_tpa, "disable the TPA (LRO) feature");
 MODULE_PARM_DESC(poll, "use polling (for debug)");
@@ -8160,6 +8165,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
 		bp->dev->features |= NETIF_F_LRO;
 	}
 
+	bp->mrrs = mrrs;
 
 	bp->tx_ring_size = MAX_TX_AVAIL;
 	bp->rx_ring_size = MAX_RX_AVAIL;