Author: hselasky
Date: Mon Jul 10 19:26:50 2017
New Revision: 320876
URL: https://svnweb.freebsd.org/changeset/base/320876
Log:
Make sure the mlx4en RX DMA ring gets stamped with software ownership
in order to prevent the flow of QP to error in the firmware once
UPDATE_QP is called.
MFC after: 3 days
Sponsored by: Mellanox Technologies
Modified:
head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c
Modified: head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c
==============================================================================
--- head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c Mon Jul 10 17:53:12 2017
(r320875)
+++ head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c Mon Jul 10 19:26:50 2017
(r320876)
@@ -394,8 +394,14 @@ int mlx4_en_activate_rx_rings(struct mlx4_en_priv *pri
ring->rx_mb_size = priv->rx_mb_size;
ring->stride = stride;
- if (ring->stride <= TXBB_SIZE)
+ if (ring->stride <= TXBB_SIZE) {
+ /* Stamp first unused send wqe */
+ __be32 *ptr = (__be32 *)ring->buf;
+ __be32 stamp = cpu_to_be32(1 << STAMP_SHIFT);
+ *ptr = stamp;
+ /* Move pointer to start of rx section */
ring->buf += TXBB_SIZE;
+ }
ring->log_stride = ffs(ring->stride) - 1;
ring->buf_size = ring->size * ring->stride;
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