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>

3 files changed, 13 insertions, 1 deletions

diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h
index 9834a86d8139..891a58ed7591 100644
--- a/drivers/net/bnx2x.h
+++ b/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;
diff --git a/drivers/net/bnx2x_init.h b/drivers/net/bnx2x_init.h
index a6c0b3abba29..961db4916f25 100644
--- a/drivers/net/bnx2x_init.h
+++ b/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",
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 60a4e94e6840..2e4d64df66f5 100644
--- a/drivers/net/bnx2x_main.c
+++ b/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;