[dpdk-dev] [PATCH v3 4/6] net/mlx5: reduce memory overhead for BF handling
Nelio Laranjeiro
nelio.laranjeiro at 6wind.com
Tue Sep 20 10:53:49 CEST 2016
Blue Flame (aka BF) is a buffer allocated with a power of two value, its
size is returned by Verbs in log2.
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
drivers/net/mlx5/mlx5_rxtx.c | 2 +-
drivers/net/mlx5/mlx5_rxtx.h | 2 +-
drivers/net/mlx5/mlx5_txq.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 4f28aa9..214922b 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -413,7 +413,7 @@ mlx5_tx_dbrec(struct txq *txq)
/* Ensure ordering between DB record and BF copy. */
rte_wmb();
rte_mov16(dst, (uint8_t *)data);
- txq->bf_offset ^= txq->bf_buf_size;
+ txq->bf_offset ^= (1 << txq->bf_buf_size);
}
/**
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 224614e..3dca8ca 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -249,8 +249,8 @@ struct txq {
uint16_t wqe_n; /* Number of WQ elements. */
uint16_t elts_n:4; /* (*elts)[] length (in log2). */
uint16_t cqe_n:4; /* Number of CQ elements (in log2). */
+ uint16_t bf_buf_size:4; /* Log2 Blueflame size. */
uint16_t bf_offset; /* Blueflame offset. */
- uint16_t bf_buf_size; /* Blueflame size. */
uint16_t max_inline; /* Multiple of RTE_CACHE_LINE_SIZE to inline. */
uint32_t qp_num_8s; /* QP number shifted by 8. */
volatile struct mlx5_cqe (*cqes)[]; /* Completion queue. */
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 6145b69..9919e37 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -221,7 +221,7 @@ txq_setup(struct txq_ctrl *tmpl, struct txq_ctrl *txq_ctrl)
tmpl->txq.qp_db = &qp->gen_data.db[MLX5_SND_DBR];
tmpl->txq.bf_reg = qp->gen_data.bf->reg;
tmpl->txq.bf_offset = qp->gen_data.bf->offset;
- tmpl->txq.bf_buf_size = qp->gen_data.bf->buf_size;
+ tmpl->txq.bf_buf_size = log2above(qp->gen_data.bf->buf_size);
tmpl->txq.cq_db = cq->dbrec;
tmpl->txq.cqes =
(volatile struct mlx5_cqe (*)[])
--
2.1.4
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