e1000: Adding e1000_dump function

When TX hang occurs e1000_dump prints TX ring, RX ring and Device registers.

Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

3 files changed, 235 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/e1000/e1000.h b/drivers/net/ethernet/intel/e1000/e1000.h
index 1e1596990b5c..2b6cd02bfba0 100644
--- a/drivers/net/ethernet/intel/e1000/e1000.h
+++ b/drivers/net/ethernet/intel/e1000/e1000.h
@@ -254,6 +254,7 @@ struct e1000_adapter {
         atomic_t tx_fifo_stall;
         bool pcix_82544;
         bool detect_tx_hung;
+        bool dump_buffers;
 
         /* RX */
         bool (*clean_rx)(struct e1000_adapter *adapter,
diff --git a/drivers/net/ethernet/intel/e1000/e1000_hw.h b/drivers/net/ethernet/intel/e1000/e1000_hw.h
index f6c4d7e2560c..11578c8978db 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_hw.h
+++ b/drivers/net/ethernet/intel/e1000/e1000_hw.h
@@ -895,6 +895,11 @@ struct e1000_ffvt_entry {
 #define E1000_FCRTL    0x02160  /* Flow Control Receive Threshold Low - RW */
 #define E1000_FCRTH    0x02168  /* Flow Control Receive Threshold High - RW */
 #define E1000_PSRCTL   0x02170  /* Packet Split Receive Control - RW */
+#define E1000_RDFH     0x02410  /* RX Data FIFO Head - RW */
+#define E1000_RDFT     0x02418  /* RX Data FIFO Tail - RW */
+#define E1000_RDFHS    0x02420  /* RX Data FIFO Head Saved - RW */
+#define E1000_RDFTS    0x02428  /* RX Data FIFO Tail Saved - RW */
+#define E1000_RDFPC    0x02430  /* RX Data FIFO Packet Count - RW */
 #define E1000_RDBAL    0x02800  /* RX Descriptor Base Address Low - RW */
 #define E1000_RDBAH    0x02804  /* RX Descriptor Base Address High - RW */
 #define E1000_RDLEN    0x02808  /* RX Descriptor Length - RW */
@@ -1074,6 +1079,11 @@ struct e1000_ffvt_entry {
 #define E1000_82542_IMC      E1000_IMC
 #define E1000_82542_RCTL     E1000_RCTL
 #define E1000_82542_RDTR     0x00108
+#define E1000_82542_RDFH     E1000_RDFH
+#define E1000_82542_RDFT     E1000_RDFT
+#define E1000_82542_RDFHS    E1000_RDFHS
+#define E1000_82542_RDFTS    E1000_RDFTS
+#define E1000_82542_RDFPC    E1000_RDFPC
 #define E1000_82542_RDBAL    0x00110
 #define E1000_82542_RDBAH    0x00114
 #define E1000_82542_RDLEN    0x00118
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 363fd395c75b..1f86a70b88af 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -3239,6 +3239,228 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
         return NETDEV_TX_OK;
 }
 
+#define NUM_REGS 38 /* 1 based count */
+static void e1000_regdump(struct e1000_adapter *adapter)
+{
+        struct e1000_hw *hw = &adapter->hw;
+        u32 regs[NUM_REGS];
+        u32 *regs_buff = regs;
+        int i = 0;
+
+        char *reg_name[] = {
+        "CTRL",  "STATUS",
+        "RCTL", "RDLEN", "RDH", "RDT", "RDTR",
+        "TCTL", "TDBAL", "TDBAH", "TDLEN", "TDH", "TDT",
+        "TIDV", "TXDCTL", "TADV", "TARC0",
+        "TDBAL1", "TDBAH1", "TDLEN1", "TDH1", "TDT1",
+        "TXDCTL1", "TARC1",
+        "CTRL_EXT", "ERT", "RDBAL", "RDBAH",
+        "TDFH", "TDFT", "TDFHS", "TDFTS", "TDFPC",
+        "RDFH", "RDFT", "RDFHS", "RDFTS", "RDFPC"
+        };
+
+        regs_buff[0]  = er32(CTRL);
+        regs_buff[1]  = er32(STATUS);
+
+        regs_buff[2]  = er32(RCTL);
+        regs_buff[3]  = er32(RDLEN);
+        regs_buff[4]  = er32(RDH);
+        regs_buff[5]  = er32(RDT);
+        regs_buff[6]  = er32(RDTR);
+
+        regs_buff[7]  = er32(TCTL);
+        regs_buff[8]  = er32(TDBAL);
+        regs_buff[9]  = er32(TDBAH);
+        regs_buff[10] = er32(TDLEN);
+        regs_buff[11] = er32(TDH);
+        regs_buff[12] = er32(TDT);
+        regs_buff[13] = er32(TIDV);
+        regs_buff[14] = er32(TXDCTL);
+        regs_buff[15] = er32(TADV);
+        regs_buff[16] = er32(TARC0);
+
+        regs_buff[17] = er32(TDBAL1);
+        regs_buff[18] = er32(TDBAH1);
+        regs_buff[19] = er32(TDLEN1);
+        regs_buff[20] = er32(TDH1);
+        regs_buff[21] = er32(TDT1);
+        regs_buff[22] = er32(TXDCTL1);
+        regs_buff[23] = er32(TARC1);
+        regs_buff[24] = er32(CTRL_EXT);
+        regs_buff[25] = er32(ERT);
+        regs_buff[26] = er32(RDBAL0);
+        regs_buff[27] = er32(RDBAH0);
+        regs_buff[28] = er32(TDFH);
+        regs_buff[29] = er32(TDFT);
+        regs_buff[30] = er32(TDFHS);
+        regs_buff[31] = er32(TDFTS);
+        regs_buff[32] = er32(TDFPC);
+        regs_buff[33] = er32(RDFH);
+        regs_buff[34] = er32(RDFT);
+        regs_buff[35] = er32(RDFHS);
+        regs_buff[36] = er32(RDFTS);
+        regs_buff[37] = er32(RDFPC);
+
+        pr_info("Register dump\n");
+        for (i = 0; i < NUM_REGS; i++) {
+                printk(KERN_INFO "%-15s  %08x\n",
+                reg_name[i], regs_buff[i]);
+        }
+}
+
+/*
+ * e1000_dump: Print registers, tx ring and rx ring
+ */
+static void e1000_dump(struct e1000_adapter *adapter)
+{
+        /* this code doesn't handle multiple rings */
+        struct e1000_tx_ring *tx_ring = adapter->tx_ring;
+        struct e1000_rx_ring *rx_ring = adapter->rx_ring;
+        int i;
+
+        if (!netif_msg_hw(adapter))
+                return;
+
+        /* Print Registers */
+        e1000_regdump(adapter);
+
+        /*
+         * transmit dump
+         */
+        pr_info("TX Desc ring0 dump\n");
+
+        /* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)
+         *
+         * Legacy Transmit Descriptor
+         *   +--------------------------------------------------------------+
+         * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |
+         *   +--------------------------------------------------------------+
+         * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |
+         *   +--------------------------------------------------------------+
+         *   63       48 47        36 35    32 31     24 23    16 15        0
+         *
+         * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload
+         *   63      48 47    40 39       32 31             16 15    8 7      0
+         *   +----------------------------------------------------------------+
+         * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |
+         *   +----------------------------------------------------------------+
+         * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |
+         *   +----------------------------------------------------------------+
+         *   63      48 47    40 39 36 35 32 31   24 23  20 19                0
+         *
+         * Extended Data Descriptor (DTYP=0x1)
+         *   +----------------------------------------------------------------+
+         * 0 |                     Buffer Address [63:0]                      |
+         *   +----------------------------------------------------------------+
+         * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |
+         *   +----------------------------------------------------------------+
+         *   63       48 47     40 39  36 35    32 31     24 23  20 19        0
+         */
+        printk(KERN_INFO "Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ]"
+               " leng  ntw timestmp         bi->skb\n");
+        printk(KERN_INFO "Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ]"
+               " leng  ntw timestmp         bi->skb\n");
+
+        if (!netif_msg_tx_done(adapter))
+                goto rx_ring_summary;
+
+        for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
+                struct e1000_tx_desc *tx_desc = E1000_TX_DESC(*tx_ring, i);
+                struct e1000_buffer *buffer_info = &tx_ring->buffer_info[i];
+                struct my_u { u64 a; u64 b; };
+                struct my_u *u = (struct my_u *)tx_desc;
+                printk(KERN_INFO "T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X "
+                       "%016llX %p",
+                       ((le64_to_cpu(u->b) & (1<<20)) ? 'd' : 'c'), i,
+                       le64_to_cpu(u->a), le64_to_cpu(u->b),
+                       (u64)buffer_info->dma, buffer_info->length,
+                       buffer_info->next_to_watch, (u64)buffer_info->time_stamp,
+                       buffer_info->skb);
+                if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)
+                        printk(KERN_CONT" NTC/U\n");
+                else if (i == tx_ring->next_to_use)
+                        printk(KERN_CONT " NTU\n");
+                else if (i == tx_ring->next_to_clean)
+                        printk(KERN_CONT " NTC\n");
+                else
+                        printk(KERN_CONT "\n");
+
+
+                if (netif_msg_pktdata(adapter) && buffer_info->dma != 0)
+                        print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
+                                        16, 1, phys_to_virt(buffer_info->dma),
+                                        buffer_info->length, true);
+        }
+
+rx_ring_summary:
+        /*
+         * receive dump
+         */
+        pr_info("\nRX Desc ring dump\n");
+
+        /* Legacy Receive Descriptor Format
+         *
+         * +-----------------------------------------------------+
+         * |                Buffer Address [63:0]                |
+         * +-----------------------------------------------------+
+         * | VLAN Tag | Errors | Status 0 | Packet csum | Length |
+         * +-----------------------------------------------------+
+         * 63       48 47    40 39      32 31         16 15      0
+         */
+        printk(KERN_INFO "R[desc]      [address 63:0  ] [vl er S cks ln] "
+                "[bi->dma       ] [bi->skb]\n");
+
+        if (!netif_msg_rx_status(adapter))
+                goto exit;
+
+        for (i = 0; rx_ring->desc && (i < rx_ring->count); i++) {
+                struct e1000_rx_desc *rx_desc = E1000_RX_DESC(*rx_ring, i);
+                struct e1000_buffer *buffer_info = &rx_ring->buffer_info[i];
+                struct my_u { u64 a; u64 b; };
+                struct my_u *u = (struct my_u *)rx_desc;
+                printk(KERN_INFO "R[0x%03X]     %016llX %016llX %016llX %p",
+                        i, le64_to_cpu(u->a), le64_to_cpu(u->b),
+                        (u64)buffer_info->dma, buffer_info->skb);
+                if (i == rx_ring->next_to_use)
+                        printk(KERN_CONT " NTU\n");
+                else if (i == rx_ring->next_to_clean)
+                        printk(KERN_CONT " NTC\n");
+                else
+                        printk(KERN_CONT "\n");
+
+                if (netif_msg_pktdata(adapter))
+                        print_hex_dump(KERN_INFO, "",
+                                DUMP_PREFIX_ADDRESS, 16, 1,
+                                phys_to_virt(buffer_info->dma),
+                                buffer_info->length, true);
+
+        } /* for */
+
+        /* dump the descriptor caches */
+        /* rx */
+        printk(KERN_INFO "e1000: Rx descriptor cache in 64bit format\n");
+        for (i = 0x6000; i <= 0x63FF ; i += 0x10) {
+                printk(KERN_INFO "R%04X: %08X|%08X %08X|%08X\n",
+                                i,
+                                readl(adapter->hw.hw_addr + i+4),
+                                readl(adapter->hw.hw_addr + i),
+                                readl(adapter->hw.hw_addr + i+12),
+                                readl(adapter->hw.hw_addr + i+8));
+        }
+        /* tx */
+        printk(KERN_INFO "e1000: Tx descriptor cache in 64bit format\n");
+        for (i = 0x7000; i <= 0x73FF ; i += 0x10) {
+                printk(KERN_INFO "T%04X: %08X|%08X %08X|%08X\n",
+                                i,
+                                readl(adapter->hw.hw_addr + i+4),
+                                readl(adapter->hw.hw_addr + i),
+                                readl(adapter->hw.hw_addr + i+12),
+                                readl(adapter->hw.hw_addr + i+8));
+        }
+exit:
+        return;
+}
+
 /**
  * e1000_tx_timeout - Respond to a Tx Hang
  * @netdev: network interface device structure
@@ -3260,6 +3482,7 @@ static void e1000_reset_task(struct work_struct *work)
 
         if (test_bit(__E1000_DOWN, &adapter->flags))
                 return;
+        e_err(drv, "Reset adapter\n");
         e1000_reinit_safe(adapter);
 }
 
@@ -3677,6 +3900,7 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
                                 eop,
                                 jiffies,
                                 eop_desc->upper.fields.status);
+                        e1000_dump(adapter);
                         netif_stop_queue(netdev);
                 }
         }