net/mlx4_en: Fix BlueFlame race

Fix a race between BlueFlame flow and stamping in post send flow.
Example:
	SW: Build WQE 0 on the TX buffer, except the ownership bit
	SW: Set ownership for WQE 0 on the TX buffer
	SW: Ring doorbell for WQE 0
	SW: Build WQE 1 on the TX buffer, except the ownership bit
	SW: Set ownership for WQE 1 on the TX buffer
	HW: Read WQE 0 and then WQE 1, before doorbell was rung/BF was done for WQE 1
	HW: Produce CQEs for WQE 0 and WQE 1
	SW: Process the CQEs, and stamp WQE 0 and WQE 1 accordingly (on the TX buffer)
	SW: Copy WQE 1 from the TX buffer to the BF register - ALREADY STAMPED!
	HW: CQE error with index 0xFFFF  - the BF WQE's control segment is STAMPED,
		so the BF index is 0xFFFF. Error: Invalid Opcode.
As a result QP enters the error state and no traffic can be sent.

Solution:
When stamping - do not stamp last completed wqe.

Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 7c49238..6dcca98 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -191,6 +191,39 @@ void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
                       MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
 }
 
+static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
+                             struct mlx4_en_tx_ring *ring, int index,
+                             u8 owner)
+{
+       __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
+       struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
+       struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
+       void *end = ring->buf + ring->buf_size;
+       __be32 *ptr = (__be32 *)tx_desc;
+       int i;
+
+       /* Optimize the common case when there are no wraparounds */
+       if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
+               /* Stamp the freed descriptor */
+               for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
+                    i += STAMP_STRIDE) {
+                       *ptr = stamp;
+                       ptr += STAMP_DWORDS;
+               }
+       } else {
+               /* Stamp the freed descriptor */
+               for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
+                    i += STAMP_STRIDE) {
+                       *ptr = stamp;
+                       ptr += STAMP_DWORDS;
+                       if ((void *)ptr >= end) {
+                               ptr = ring->buf;
+                               stamp ^= cpu_to_be32(0x80000000);
+                       }
+               }
+       }
+}
+
 
 static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
                                struct mlx4_en_tx_ring *ring,
@@ -205,8 +238,6 @@ static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
        void *end = ring->buf + ring->buf_size;
        int frags = skb_shinfo(skb)->nr_frags;
        int i;
-       __be32 *ptr = (__be32 *)tx_desc;
-       __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
        struct skb_shared_hwtstamps hwts;
 
        if (timestamp) {
@@ -232,12 +263,6 @@ static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
                                        skb_frag_size(frag), PCI_DMA_TODEVICE);
                        }
                }
-               /* Stamp the freed descriptor */
-               for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) {
-                       *ptr = stamp;
-                       ptr += STAMP_DWORDS;
-               }
-
        } else {
                if (!tx_info->inl) {
                        if ((void *) data >= end) {
@@ -263,16 +288,6 @@ static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
                                ++data;
                        }
                }
-               /* Stamp the freed descriptor */
-               for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) {
-                       *ptr = stamp;
-                       ptr += STAMP_DWORDS;
-                       if ((void *) ptr >= end) {
-                               ptr = ring->buf;
-                               stamp ^= cpu_to_be32(0x80000000);
-                       }
-               }
-
        }
        dev_kfree_skb_any(skb);
        return tx_info->nr_txbb;
@@ -318,8 +333,9 @@ static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq)
        struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring];
        struct mlx4_cqe *cqe;
        u16 index;
-       u16 new_index, ring_index;
+       u16 new_index, ring_index, stamp_index;
        u32 txbbs_skipped = 0;
+       u32 txbbs_stamp = 0;
        u32 cons_index = mcq->cons_index;
        int size = cq->size;
        u32 size_mask = ring->size_mask;
@@ -335,6 +351,7 @@ static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq)
        index = cons_index & size_mask;
        cqe = &buf[(index << factor) + factor];
        ring_index = ring->cons & size_mask;
+       stamp_index = ring_index;
 
        /* Process all completed CQEs */
        while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
@@ -359,6 +376,12 @@ static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq)
                                        priv, ring, ring_index,
                                        !!((ring->cons + txbbs_skipped) &
                                        ring->size), timestamp);
+
+                       mlx4_en_stamp_wqe(priv, ring, stamp_index,
+                                         !!((ring->cons + txbbs_stamp) &
+                                               ring->size));
+                       stamp_index = ring_index;
+                       txbbs_stamp = txbbs_skipped;
                        packets++;
                        bytes += ring->tx_info[ring_index].nr_bytes;
                } while (ring_index != new_index);