e1000e: fix IPMI traffic

Some users reported that they have machines with BMCs enabled that cannot
receive IPMI traffic after e1000e is loaded.
http://marc.info/?l=e1000-devel&m=121909039127414&w=2
http://marc.info/?l=e1000-devel&m=121365543823387&w=2

This fixes the issue if they load with the new parameter = 0 by disabling
crc stripping, but leaves the performance feature on for most users.
Based on work done by Hong Zhang.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index c55de1c..c55fd6f 100644 (file)
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -299,6 +299,7 @@ struct e1000_adapter {
        unsigned long led_status;
 
        unsigned int flags;
+       unsigned int flags2;
        struct work_struct downshift_task;
        struct work_struct update_phy_task;
 };
@@ -306,6 +307,7 @@ struct e1000_adapter {
 struct e1000_info {
        enum e1000_mac_type     mac;
        unsigned int            flags;
+       unsigned int            flags2;
        u32                     pba;
        s32                     (*get_variants)(struct e1000_adapter *);
        struct e1000_mac_operations *mac_ops;
@@ -347,6 +349,9 @@ struct e1000_info {
 #define FLAG_RX_RESTART_NOW               (1 << 30)
 #define FLAG_MSI_TEST_FAILED              (1 << 31)
 
+/* CRC Stripping defines */
+#define FLAG2_CRC_STRIPPING               (1 << 0)
+
 #define E1000_RX_DESC_PS(R, i)     \
        (&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))
 #define E1000_GET_DESC(R, i, type)     (&(((struct type *)((R).desc))[i]))

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index f6ebebb..91795f7 100644 (file)
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -499,6 +499,10 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
                        goto next_desc;
                }
 
+               /* adjust length to remove Ethernet CRC */
+               if (!(adapter->flags2 & FLAG2_CRC_STRIPPING))
+                       length -= 4;
+
                total_rx_bytes += length;
                total_rx_packets++;
 
@@ -804,6 +808,10 @@ static bool e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
                        pci_dma_sync_single_for_device(pdev, ps_page->dma,
                                PAGE_SIZE, PCI_DMA_FROMDEVICE);
 
+                       /* remove the CRC */
+                       if (!(adapter->flags2 & FLAG2_CRC_STRIPPING))
+                               l1 -= 4;
+
                        skb_put(skb, l1);
                        goto copydone;
                } /* if */
@@ -825,6 +833,12 @@ static bool e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
                        skb->truesize += length;
                }
 
+               /* strip the ethernet crc, problem is we're using pages now so
+                * this whole operation can get a little cpu intensive
+                */
+               if (!(adapter->flags2 & FLAG2_CRC_STRIPPING))
+                       pskb_trim(skb, skb->len - 4);
+
 copydone:
                total_rx_bytes += skb->len;
                total_rx_packets++;
@@ -2301,8 +2315,12 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
        else
                rctl |= E1000_RCTL_LPE;
 
-       /* Enable hardware CRC frame stripping */
-       rctl |= E1000_RCTL_SECRC;
+       /* Some systems expect that the CRC is included in SMBUS traffic. The
+        * hardware strips the CRC before sending to both SMBUS (BMC) and to
+        * host memory when this is enabled
+        */
+       if (adapter->flags2 & FLAG2_CRC_STRIPPING)
+               rctl |= E1000_RCTL_SECRC;
 
        /* Setup buffer sizes */
        rctl &= ~E1000_RCTL_SZ_4096;
@@ -4766,6 +4784,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
        adapter->ei = ei;
        adapter->pba = ei->pba;
        adapter->flags = ei->flags;
+       adapter->flags2 = ei->flags2;
        adapter->hw.adapter = adapter;
        adapter->hw.mac.type = ei->mac;
        adapter->msg_enable = (1 << NETIF_MSG_DRV | NETIF_MSG_PROBE) - 1;

diff --git a/drivers/net/e1000e/param.c b/drivers/net/e1000e/param.c
index 77a3d72..e909f96 100644 (file)
--- a/drivers/net/e1000e/param.c
+++ b/drivers/net/e1000e/param.c
@@ -151,6 +151,16 @@ E1000_PARAM(KumeranLockLoss, "Enable Kumeran lock loss workaround");
  */
 E1000_PARAM(WriteProtectNVM, "Write-protect NVM [WARNING: disabling this can lead to corrupted NVM]");
 
+/*
+ * Enable CRC Stripping
+ *
+ * Valid Range: 0, 1
+ *
+ * Default Value: 1 (enabled)
+ */
+E1000_PARAM(CrcStripping, "Enable CRC Stripping, disable if your BMC needs " \
+                          "the CRC");
+
 struct e1000_option {
        enum { enable_option, range_option, list_option } type;
        const char *name;
@@ -404,6 +414,21 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
                                adapter->flags |= FLAG_SMART_POWER_DOWN;
                }
        }
+       { /* CRC Stripping */
+               const struct e1000_option opt = {
+                       .type = enable_option,
+                       .name = "CRC Stripping",
+                       .err  = "defaulting to enabled",
+                       .def  = OPTION_ENABLED
+               };
+
+               if (num_CrcStripping > bd) {
+                       unsigned int crc_stripping = CrcStripping[bd];
+                       e1000_validate_option(&crc_stripping, &opt, adapter);
+                       if (crc_stripping == OPTION_ENABLED)
+                               adapter->flags2 |= FLAG2_CRC_STRIPPING;
+               }
+       }
        { /* Kumeran Lock Loss Workaround */
                const struct e1000_option opt = {
                        .type = enable_option,