tg3: Add RSS support

This patch adds code needed to enable RSS.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 76 insertions, 2 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index f51c29c64741..26e9db8c1b95 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -102,6 +102,7 @@
 #define TG3_DEF_RX_RING_PENDING         200
 #define TG3_RX_JUMBO_RING_SIZE          256
 #define TG3_DEF_RX_JUMBO_RING_PENDING   100
+#define TG3_RSS_INDIR_TBL_SIZE 128
 
 /* Do not place this n-ring entries value into the tp struct itself,
  * we really want to expose these constants to GCC so that modulo et
@@ -7497,6 +7498,12 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
         tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl);
         udelay(100);
 
+        if (tp->tg3_flags2 & TG3_FLG2_USING_MSIX) {
+                val = tr32(MSGINT_MODE);
+                val |= MSGINT_MODE_MULTIVEC_EN | MSGINT_MODE_ENABLE;
+                tw32(MSGINT_MODE, val);
+        }
+
         if (!(tp->tg3_flags2 & TG3_FLG2_5705_PLUS)) {
                 tw32_f(DMAC_MODE, DMAC_MODE_ENABLE);
                 udelay(40);
@@ -7565,7 +7572,10 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
         tw32(SNDDATAI_MODE, SNDDATAI_MODE_ENABLE);
         if (tp->tg3_flags2 & TG3_FLG2_HW_TSO)
                 tw32(SNDDATAI_MODE, SNDDATAI_MODE_ENABLE | 0x8);
-        tw32(SNDBDI_MODE, SNDBDI_MODE_ENABLE | SNDBDI_MODE_ATTN_ENABLE);
+        val = SNDBDI_MODE_ENABLE | SNDBDI_MODE_ATTN_ENABLE;
+        if (tp->tg3_flags2 & TG3_FLG2_USING_MSIX)
+                val |= SNDBDI_MODE_MULTI_TXQ_EN;
+        tw32(SNDBDI_MODE, val);
         tw32(SNDBDS_MODE, SNDBDS_MODE_ENABLE | SNDBDS_MODE_ATTN_ENABLE);
 
         if (tp->pci_chip_rev_id == CHIPREV_ID_5701_A0) {
@@ -7584,10 +7594,46 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
         tw32_f(MAC_TX_MODE, tp->tx_mode);
         udelay(100);
 
+        if (tp->tg3_flags3 & TG3_FLG3_ENABLE_RSS) {
+                u32 reg = MAC_RSS_INDIR_TBL_0;
+                u8 *ent = (u8 *)&val;
+
+                /* Setup the indirection table */
+                for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++) {
+                        int idx = i % sizeof(val);
+
+                        ent[idx] = i % (tp->irq_cnt - 1);
+                        if (idx == sizeof(val) - 1) {
+                                tw32(reg, val);
+                                reg += 4;
+                        }
+                }
+
+                /* Setup the "secret" hash key. */
+                tw32(MAC_RSS_HASH_KEY_0, 0x5f865437);
+                tw32(MAC_RSS_HASH_KEY_1, 0xe4ac62cc);
+                tw32(MAC_RSS_HASH_KEY_2, 0x50103a45);
+                tw32(MAC_RSS_HASH_KEY_3, 0x36621985);
+                tw32(MAC_RSS_HASH_KEY_4, 0xbf14c0e8);
+                tw32(MAC_RSS_HASH_KEY_5, 0x1bc27a1e);
+                tw32(MAC_RSS_HASH_KEY_6, 0x84f4b556);
+                tw32(MAC_RSS_HASH_KEY_7, 0x094ea6fe);
+                tw32(MAC_RSS_HASH_KEY_8, 0x7dda01e7);
+                tw32(MAC_RSS_HASH_KEY_9, 0xc04d7481);
+        }
+
         tp->rx_mode = RX_MODE_ENABLE;
         if (tp->tg3_flags3 & TG3_FLG3_5755_PLUS)
                 tp->rx_mode |= RX_MODE_IPV6_CSUM_ENABLE;
 
+        if (tp->tg3_flags3 & TG3_FLG3_ENABLE_RSS)
+                tp->rx_mode |= RX_MODE_RSS_ENABLE |
+                               RX_MODE_RSS_ITBL_HASH_BITS_7 |
+                               RX_MODE_RSS_IPV6_HASH_EN |
+                               RX_MODE_RSS_TCP_IPV6_HASH_EN |
+                               RX_MODE_RSS_IPV4_HASH_EN |
+                               RX_MODE_RSS_TCP_IPV4_HASH_EN;
+
         tw32_f(MAC_RX_MODE, tp->rx_mode);
         udelay(10);
 
@@ -8112,6 +8158,8 @@ static bool tg3_enable_msix(struct tg3 *tp)
                 tp->irq_cnt = rc;
         }
 
+        tp->tg3_flags3 |= TG3_FLG3_ENABLE_RSS;
+
         for (i = 0; i < tp->irq_max; i++)
                 tp->napi[i].irq_vec = msix_ent[i].vector;
 
@@ -8140,6 +8188,8 @@ static void tg3_ints_init(struct tg3 *tp)
 
         if (tp->tg3_flags2 & TG3_FLG2_USING_MSI_OR_MSIX) {
                 u32 msi_mode = tr32(MSGINT_MODE);
+                if (tp->tg3_flags2 & TG3_FLG2_USING_MSIX)
+                        msi_mode |= MSGINT_MODE_MULTIVEC_EN;
                 tw32(MSGINT_MODE, msi_mode | MSGINT_MODE_ENABLE);
         }
 defcfg:
@@ -8157,6 +8207,7 @@ static void tg3_ints_fini(struct tg3 *tp)
         else if (tp->tg3_flags2 & TG3_FLG2_USING_MSI)
                 pci_disable_msi(tp->pdev);
         tp->tg3_flags2 &= ~TG3_FLG2_USING_MSI_OR_MSIX;
+        tp->tg3_flags3 &= ~TG3_FLG3_ENABLE_RSS;
 }
 
 static int tg3_open(struct net_device *dev)
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 978b6d9546fb..348add254d11 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -446,6 +446,12 @@
 #define  RX_MODE_PROMISC                 0x00000100
 #define  RX_MODE_NO_CRC_CHECK            0x00000200
 #define  RX_MODE_KEEP_VLAN_TAG           0x00000400
+#define  RX_MODE_RSS_IPV4_HASH_EN        0x00010000
+#define  RX_MODE_RSS_TCP_IPV4_HASH_EN    0x00020000
+#define  RX_MODE_RSS_IPV6_HASH_EN        0x00040000
+#define  RX_MODE_RSS_TCP_IPV6_HASH_EN    0x00080000
+#define  RX_MODE_RSS_ITBL_HASH_BITS_7    0x00700000
+#define  RX_MODE_RSS_ENABLE              0x00800000
 #define  RX_MODE_IPV6_CSUM_ENABLE        0x01000000
 #define MAC_RX_STATUS                   0x0000046c
 #define  RX_STATUS_REMOTE_TX_XOFFED      0x00000001
@@ -690,7 +696,22 @@
 /* 0x5b8 --> 0x600 unused */
 #define MAC_TX_MAC_STATE_BASE           0x00000600 /* 16 bytes */
 #define MAC_RX_MAC_STATE_BASE           0x00000610 /* 20 bytes */
-/* 0x624 --> 0x800 unused */
+/* 0x624 --> 0x670 unused */
+
+#define MAC_RSS_INDIR_TBL_0             0x00000630
+
+#define MAC_RSS_HASH_KEY_0              0x00000670
+#define MAC_RSS_HASH_KEY_1              0x00000674
+#define MAC_RSS_HASH_KEY_2              0x00000678
+#define MAC_RSS_HASH_KEY_3              0x0000067c
+#define MAC_RSS_HASH_KEY_4              0x00000680
+#define MAC_RSS_HASH_KEY_5              0x00000684
+#define MAC_RSS_HASH_KEY_6              0x00000688
+#define MAC_RSS_HASH_KEY_7              0x0000068c
+#define MAC_RSS_HASH_KEY_8              0x00000690
+#define MAC_RSS_HASH_KEY_9              0x00000694
+/* 0x698 --> 0x800 unused */
+
 #define MAC_TX_STATS_OCTETS             0x00000800
 #define MAC_TX_STATS_RESV1              0x00000804
 #define MAC_TX_STATS_COLLISIONS         0x00000808
@@ -1465,6 +1486,7 @@
 #define MSGINT_MODE                     0x00006000
 #define  MSGINT_MODE_RESET               0x00000001
 #define  MSGINT_MODE_ENABLE              0x00000002
+#define  MSGINT_MODE_MULTIVEC_EN         0x00000080
 #define MSGINT_STATUS                   0x00006004
 #define MSGINT_FIFO                     0x00006008
 /* 0x600c --> 0x6400 unused */
@@ -2704,6 +2726,7 @@ struct tg3 {
 #define TG3_FLG3_NO_NVRAM               0x00004000
 #define TG3_FLG3_TOGGLE_10_100_L1PLLPD  0x00008000
 #define TG3_FLG3_PHY_IS_FET             0x00010000
+#define TG3_FLG3_ENABLE_RSS             0x00020000
 
         struct timer_list               timer;
         u16                             timer_counter;