bnx2x: add support for receive hashing

Add support to bnx2x to extract Toeplitz hash out of the receive
descriptor for use in skb->rxhash.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 19 insertions, 9 deletions

diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h
index 081953005b8..8bd23687c53 100644
--- a/drivers/net/bnx2x.h
+++ b/drivers/net/bnx2x.h
@@ -1330,7 +1330,7 @@ static inline u32 reg_poll(struct bnx2x *bp, u32 reg, u32 expected, int ms,
                 AEU_INPUTS_ATTN_BITS_MCP_LATCHED_UMP_TX_PARITY | \
                 AEU_INPUTS_ATTN_BITS_MCP_LATCHED_SCPAD_PARITY)
 
-#define MULTI_FLAGS(bp) \
+#define RSS_FLAGS(bp) \
                 (TSTORM_ETH_FUNCTION_COMMON_CONFIG_RSS_IPV4_CAPABILITY | \
                  TSTORM_ETH_FUNCTION_COMMON_CONFIG_RSS_IPV4_TCP_CAPABILITY | \
                  TSTORM_ETH_FUNCTION_COMMON_CONFIG_RSS_IPV6_CAPABILITY | \
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 0c6dba24e37..613f7274654 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -1582,7 +1582,7 @@ static int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
                 struct sw_rx_bd *rx_buf = NULL;
                 struct sk_buff *skb;
                 union eth_rx_cqe *cqe;
-                u8 cqe_fp_flags;
+                u8 cqe_fp_flags, cqe_fp_status_flags;
                 u16 len, pad;
 
                 comp_ring_cons = RCQ_BD(sw_comp_cons);
@@ -1598,6 +1598,7 @@ static int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
 
                 cqe = &fp->rx_comp_ring[comp_ring_cons];
                 cqe_fp_flags = cqe->fast_path_cqe.type_error_flags;
+                cqe_fp_status_flags = cqe->fast_path_cqe.status_flags;
 
                 DP(NETIF_MSG_RX_STATUS, "CQE type %x  err %x  status %x"
                    "  queue %x  vlan %x  len %u\n", CQE_TYPE(cqe_fp_flags),
@@ -1727,6 +1728,12 @@ reuse_rx:
 
                         skb->protocol = eth_type_trans(skb, bp->dev);
 
+                        if ((bp->dev->features & ETH_FLAG_RXHASH) &&
+                            (cqe_fp_status_flags &
+                             ETH_FAST_PATH_RX_CQE_RSS_HASH_FLG))
+                                skb->rxhash = le32_to_cpu(
+                                    cqe->fast_path_cqe.rss_hash_result);
+
                         skb->ip_summed = CHECKSUM_NONE;
                         if (bp->rx_csum) {
                                 if (likely(BNX2X_RX_CSUM_OK(cqe)))
@@ -5750,10 +5757,10 @@ static void bnx2x_init_internal_func(struct bnx2x *bp)
         u32 offset;
         u16 max_agg_size;
 
-        if (is_multi(bp)) {
-                tstorm_config.config_flags = MULTI_FLAGS(bp);
+        tstorm_config.config_flags = RSS_FLAGS(bp);
+
+        if (is_multi(bp))
                 tstorm_config.rss_result_mask = MULTI_MASK;
-        }
 
         /* Enable TPA if needed */
         if (bp->flags & TPA_ENABLE_FLAG)
@@ -6629,10 +6636,8 @@ static int bnx2x_init_common(struct bnx2x *bp)
         bnx2x_init_block(bp, PBF_BLOCK, COMMON_STAGE);
 
         REG_WR(bp, SRC_REG_SOFT_RST, 1);
-        for (i = SRC_REG_KEYRSS0_0; i <= SRC_REG_KEYRSS1_9; i += 4) {
-                REG_WR(bp, i, 0xc0cac01a);
-                /* TODO: replace with something meaningful */
-        }
+        for (i = SRC_REG_KEYRSS0_0; i <= SRC_REG_KEYRSS1_9; i += 4)
+                REG_WR(bp, i, random32());
         bnx2x_init_block(bp, SRCH_BLOCK, COMMON_STAGE);
 #ifdef BCM_CNIC
         REG_WR(bp, SRC_REG_KEYSEARCH_0, 0x63285672);
@@ -11001,6 +11006,11 @@ static int bnx2x_set_flags(struct net_device *dev, u32 data)
                 changed = 1;
         }
 
+        if (data & ETH_FLAG_RXHASH)
+                dev->features |= NETIF_F_RXHASH;
+        else
+                dev->features &= ~NETIF_F_RXHASH;
+
         if (changed && netif_running(dev)) {
                 bnx2x_nic_unload(bp, UNLOAD_NORMAL);
                 rc = bnx2x_nic_load(bp, LOAD_NORMAL);