[dpdk-dev] [PATCH 2/4] net/mlx5: optimize Tx external memory registration
Yongseok Koh
yskoh at mellanox.com
Thu Nov 15 11:29:17 CET 2018
There's some performance drop due to extra condition checks on the
datapath. Checking for external memory registration should be consolidated
to the existing bottom-half.
Fixes: 7e43a32ee060 ("net/mlx5: support externally allocated static memory")
Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
drivers/net/mlx5/mlx5_mr.c | 28 +++++++++++++++++++++++++++-
drivers/net/mlx5/mlx5_rxtx.h | 26 ++++++--------------------
2 files changed, 33 insertions(+), 21 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index 6d7653d7d6..442b2d2321 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -1045,7 +1045,7 @@ mlx5_rx_addr2mr_bh(struct mlx5_rxq_data *rxq, uintptr_t addr)
* @return
* Searched LKey on success, UINT32_MAX on no match.
*/
-uint32_t
+static uint32_t
mlx5_tx_addr2mr_bh(struct mlx5_txq_data *txq, uintptr_t addr)
{
struct mlx5_txq_ctrl *txq_ctrl =
@@ -1060,6 +1060,32 @@ mlx5_tx_addr2mr_bh(struct mlx5_txq_data *txq, uintptr_t addr)
}
/**
+ * Bottom-half of LKey search on Tx. If it can't be searched in the memseg
+ * list, register the mempool of the mbuf as externally allocated memory.
+ *
+ * @param txq
+ * Pointer to Tx queue structure.
+ * @param mb
+ * Pointer to mbuf.
+ *
+ * @return
+ * Searched LKey on success, UINT32_MAX on no match.
+ */
+uint32_t
+mlx5_tx_mb2mr_bh(struct mlx5_txq_data *txq, struct rte_mbuf *mb)
+{
+ uintptr_t addr = (uintptr_t)mb->buf_addr;
+ uint32_t lkey;
+
+ lkey = mlx5_tx_addr2mr_bh(txq, addr);
+ if (lkey == UINT32_MAX && rte_errno == ENXIO) {
+ /* Mempool may have externally allocated memory. */
+ return mlx5_tx_update_ext_mp(txq, addr, mlx5_mb2mp(mb));
+ }
+ return lkey;
+}
+
+/**
* Flush all of the local cache entries.
*
* @param mr_ctrl
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 1b6200f6c8..59fb43fefe 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -363,7 +363,7 @@ uint16_t mlx5_rx_burst_vec(void *dpdk_txq, struct rte_mbuf **pkts,
void mlx5_mr_flush_local_cache(struct mlx5_mr_ctrl *mr_ctrl);
uint32_t mlx5_rx_addr2mr_bh(struct mlx5_rxq_data *rxq, uintptr_t addr);
-uint32_t mlx5_tx_addr2mr_bh(struct mlx5_txq_data *txq, uintptr_t addr);
+uint32_t mlx5_tx_mb2mr_bh(struct mlx5_txq_data *txq, struct rte_mbuf *mb);
uint32_t mlx5_tx_update_ext_mp(struct mlx5_txq_data *txq, uintptr_t addr,
struct rte_mempool *mp);
@@ -619,7 +619,7 @@ mlx5_tx_complete(struct mlx5_txq_data *txq)
* @return
* Memory pool where data is located for given mbuf.
*/
-static struct rte_mempool *
+static inline struct rte_mempool *
mlx5_mb2mp(struct rte_mbuf *buf)
{
if (unlikely(RTE_MBUF_INDIRECT(buf)))
@@ -668,9 +668,10 @@ mlx5_rx_addr2mr(struct mlx5_rxq_data *rxq, uintptr_t addr)
* Searched LKey on success, UINT32_MAX on no match.
*/
static __rte_always_inline uint32_t
-mlx5_tx_addr2mr(struct mlx5_txq_data *txq, uintptr_t addr)
+mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct rte_mbuf *mb)
{
struct mlx5_mr_ctrl *mr_ctrl = &txq->mr_ctrl;
+ uintptr_t addr = (uintptr_t)mb->buf_addr;
uint32_t lkey;
/* Check generation bit to see if there's any change on existing MRs. */
@@ -681,23 +682,8 @@ mlx5_tx_addr2mr(struct mlx5_txq_data *txq, uintptr_t addr)
MLX5_MR_CACHE_N, addr);
if (likely(lkey != UINT32_MAX))
return lkey;
- /* Take slower bottom-half (binary search) on miss. */
- return mlx5_tx_addr2mr_bh(txq, addr);
-}
-
-static __rte_always_inline uint32_t
-mlx5_tx_mb2mr(struct mlx5_txq_data *txq, struct rte_mbuf *mb)
-{
- uintptr_t addr = (uintptr_t)mb->buf_addr;
- uint32_t lkey = mlx5_tx_addr2mr(txq, addr);
-
- if (likely(lkey != UINT32_MAX))
- return lkey;
- if (rte_errno == ENXIO) {
- /* Mempool may have externally allocated memory. */
- lkey = mlx5_tx_update_ext_mp(txq, addr, mlx5_mb2mp(mb));
- }
- return lkey;
+ /* Take slower bottom-half on miss. */
+ return mlx5_tx_mb2mr_bh(txq, mb);
}
/**
--
2.11.0
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