[dpdk-dev] [PATCH v2 3/7] net/mlx4: save lkey in big-endian format
Ophir Munk
ophirmu at mellanox.com
Mon Oct 23 16:21:56 CEST 2017
mlx4 NIC is using lkey in big endian format. Save lkey in this format
in order to avoid conversions during Tx fast path
Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
drivers/net/mlx4/mlx4_rxtx.c | 16 +++++++---------
drivers/net/mlx4/mlx4_rxtx.h | 14 ++++++++------
2 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/net/mlx4/mlx4_rxtx.c b/drivers/net/mlx4/mlx4_rxtx.c
index ae37f9b..4a77be8 100644
--- a/drivers/net/mlx4/mlx4_rxtx.c
+++ b/drivers/net/mlx4/mlx4_rxtx.c
@@ -233,9 +233,9 @@ mlx4_txq_complete(struct txq *txq)
* Index in memory pool (MP) where to add memory region (MR)
*
* @return
- * Added mr->lkey on success, (uint32_t)-1 on failure.
+ * Added mr->lkey (rte_be32_t) on success, (uint32_t)-1 on failure.
*/
-uint32_t mlx4_txq_add_mr(struct txq *txq, struct rte_mempool *mp, uint32_t i)
+rte_be32_t mlx4_txq_add_mr(struct txq *txq, struct rte_mempool *mp, uint32_t i)
{
struct ibv_mr *mr;
@@ -260,9 +260,9 @@ uint32_t mlx4_txq_add_mr(struct txq *txq, struct rte_mempool *mp, uint32_t i)
/* Store the new entry. */
txq->mp2mr[i].mp = mp;
txq->mp2mr[i].mr = mr;
- txq->mp2mr[i].lkey = mr->lkey;
+ txq->mp2mr[i].lkey = rte_cpu_to_be_32(mr->lkey);
DEBUG("%p: new MR lkey for MP \"%s\" (%p): 0x%08" PRIu32,
- (void *)txq, mp->name, (void *)mp, txq->mp2mr[i].lkey);
+ (void *)txq, mp->name, (void *)mp, mr->lkey);
return txq->mp2mr[i].lkey;
}
@@ -289,7 +289,6 @@ mlx4_post_send(struct txq *txq, struct rte_mbuf *pkt)
uint16_t flags16[2];
} srcrb;
uint32_t head_idx = sq->head & sq->txbb_cnt_mask;
- uint32_t lkey;
uintptr_t addr;
uint32_t owner_opcode = MLX4_OPCODE_SEND;
uint32_t byte_count;
@@ -323,10 +322,10 @@ mlx4_post_send(struct txq *txq, struct rte_mbuf *pkt)
if (unlikely(dseg >= (struct mlx4_wqe_data_seg *)sq->eob))
dseg = (struct mlx4_wqe_data_seg *)sq->buf;
dseg->addr = rte_cpu_to_be_64(addr);
- /* Memory region key for this memory pool. */
- lkey = mlx4_txq_mp2mr(txq, mlx4_txq_mb2mp(buf));
+ /* Memory region key (big endian) for this memory pool. */
+ dseg->lkey = mlx4_txq_mp2mr(txq, mlx4_txq_mb2mp(buf));
#ifndef NDEBUG
- if (unlikely(lkey == (uint32_t)-1)) {
+ if (unlikely(dseg->lkey == rte_cpu_to_be_32((uint32_t)-1))) {
/* MR does not exist. */
DEBUG("%p: unable to get MP <-> MR association",
(void *)txq);
@@ -341,7 +340,6 @@ mlx4_post_send(struct txq *txq, struct rte_mbuf *pkt)
return -EFAULT;
}
#endif /* NDEBUG */
- dseg->lkey = rte_cpu_to_be_32(lkey);
if (likely(buf->data_len)) {
byte_count = rte_cpu_to_be_32(buf->data_len);
} else {
diff --git a/drivers/net/mlx4/mlx4_rxtx.h b/drivers/net/mlx4/mlx4_rxtx.h
index 719ef45..b1e8ac4 100644
--- a/drivers/net/mlx4/mlx4_rxtx.h
+++ b/drivers/net/mlx4/mlx4_rxtx.h
@@ -135,7 +135,7 @@ struct txq {
struct {
const struct rte_mempool *mp; /**< Cached memory pool. */
struct ibv_mr *mr; /**< Memory region (for mp). */
- uint32_t lkey; /**< mr->lkey copy. */
+ rte_be32_t lkey; /**< mr->lkey copy. (big endian) */
} mp2mr[MLX4_PMD_TX_MP_CACHE]; /**< MP to MR translation table. */
struct priv *priv; /**< Back pointer to private data. */
unsigned int socket; /**< CPU socket ID for allocations. */
@@ -169,7 +169,7 @@ uint16_t mlx4_tx_burst_removed(void *dpdk_txq, struct rte_mbuf **pkts,
uint16_t pkts_n);
uint16_t mlx4_rx_burst_removed(void *dpdk_rxq, struct rte_mbuf **pkts,
uint16_t pkts_n);
-uint32_t mlx4_txq_add_mr(struct txq *txq, struct rte_mempool *mp,
+rte_be32_t mlx4_txq_add_mr(struct txq *txq, struct rte_mempool *mp,
unsigned int i);
/* mlx4_txq.c */
@@ -207,9 +207,9 @@ mlx4_txq_mb2mp(struct rte_mbuf *buf)
* Memory pool for which a memory region lkey must be returned.
*
* @return
- * mr->lkey on success, (uint32_t)-1 on failure.
+ * mr->lkey (rte_be32_t) on success, (uint32_t)-1 on failure.
*/
-static __rte_always_inline uint32_t
+static __rte_always_inline rte_be32_t
mlx4_txq_mp2mr(struct txq *txq, struct rte_mempool *mp)
{
unsigned int i;
@@ -220,8 +220,10 @@ mlx4_txq_mp2mr(struct txq *txq, struct rte_mempool *mp)
break;
}
if (txq->mp2mr[i].mp == mp) {
- assert(txq->mp2mr[i].lkey != (uint32_t)-1);
- assert(txq->mp2mr[i].mr->lkey == txq->mp2mr[i].lkey);
+ assert(txq->mp2mr[i].lkey !=
+ rte_cpu_to_be_32((uint32_t)-1));
+ assert(txq->mp2mr[i].mr->lkey ==
+ rte_be_to_cpu_32(txq->mp2mr[i].lkey));
return txq->mp2mr[i].lkey;
}
}
--
2.7.4
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