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authorYongseok Koh <yskoh@mellanox.com>2018-09-24 18:36:47 +0000
committerFerruh Yigit <ferruh.yigit@intel.com>2018-10-11 18:53:49 +0200
commit7e43a32ee06054e7af9de6b9830b61b783df063b (patch)
treef2d0ad730f97d7ffa9f311151323db9c2102a945 /drivers/net/mlx5/mlx5_mr.c
parent31912d9924039c3a4f58e1bb00f380e5b4c7bd81 (diff)
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net/mlx5: support externally allocated static memory
When MLX PMD registers memory for DMA, it accesses the global memseg list of DPDK to maximize the range of registration so that LKey search can be more efficient. Granularity of MR registration is per page. Externally allocated memory shouldn't be used for DMA because it can't be searched in the memseg list and free event can't be tracked by DPDK. If it is used, the following error will occur: net_mlx5: port 0 unable to find virtually contiguous chunk for address (0x5600017587c0). rte_memseg_contig_walk() failed. There's a pending patchset [1] which enables externally allocated memory. Once it is merged, users can register their own memory out of EAL then that will resolve this issue. Meanwhile, if the external memory is static (allocated on startup and never freed), such memory can also be registered by little tweak in the code. [1] http://patches.dpdk.org/project/dpdk/list/?series=1415 This patch is not a bug fix but needs to be included in stable versions. Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support") Cc: stable@dpdk.org Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Diffstat (limited to 'drivers/net/mlx5/mlx5_mr.c')
-rw-r--r--drivers/net/mlx5/mlx5_mr.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index 1d1bcb5..f4b15d3 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -277,6 +277,23 @@ mr_find_next_chunk(struct mlx5_mr *mr, struct mlx5_mr_cache *entry,
uintptr_t end = 0;
uint32_t idx = 0;
+ /* MR for external memory doesn't have memseg list. */
+ if (mr->msl == NULL) {
+ struct ibv_mr *ibv_mr = mr->ibv_mr;
+
+ assert(mr->ms_bmp_n == 1);
+ assert(mr->ms_n == 1);
+ assert(base_idx == 0);
+ /*
+ * Can't search it from memseg list but get it directly from
+ * verbs MR as there's only one chunk.
+ */
+ entry->start = (uintptr_t)ibv_mr->addr;
+ entry->end = (uintptr_t)ibv_mr->addr + mr->ibv_mr->length;
+ entry->lkey = rte_cpu_to_be_32(mr->ibv_mr->lkey);
+ /* Returning 1 ends iteration. */
+ return 1;
+ }
for (idx = base_idx; idx < mr->ms_bmp_n; ++idx) {
if (rte_bitmap_get(mr->ms_bmp, idx)) {
const struct rte_memseg_list *msl;
@@ -811,6 +828,7 @@ mlx5_mr_mem_event_free_cb(struct rte_eth_dev *dev, const void *addr, size_t len)
mr = mr_lookup_dev_list(dev, &entry, start);
if (mr == NULL)
continue;
+ assert(mr->msl); /* Can't be external memory. */
ms = rte_mem_virt2memseg((void *)start, msl);
assert(ms != NULL);
assert(msl->page_sz == ms->hugepage_sz);
@@ -1061,6 +1079,139 @@ mlx5_mr_flush_local_cache(struct mlx5_mr_ctrl *mr_ctrl)
(void *)mr_ctrl, mr_ctrl->cur_gen);
}
+/**
+ * Called during rte_mempool_mem_iter() by mlx5_mr_update_ext_mp().
+ *
+ * Externally allocated chunk is registered and a MR is created for the chunk.
+ * The MR object is added to the global list. If memseg list of a MR object
+ * (mr->msl) is null, the MR object can be regarded as externally allocated
+ * memory.
+ *
+ * Once external memory is registered, it should be static. If the memory is
+ * freed and the virtual address range has different physical memory mapped
+ * again, it may cause crash on device due to the wrong translation entry. PMD
+ * can't track the free event of the external memory for now.
+ */
+static void
+mlx5_mr_update_ext_mp_cb(struct rte_mempool *mp, void *opaque,
+ struct rte_mempool_memhdr *memhdr,
+ unsigned mem_idx __rte_unused)
+{
+ struct mr_update_mp_data *data = opaque;
+ struct rte_eth_dev *dev = data->dev;
+ struct priv *priv = dev->data->dev_private;
+ struct mlx5_mr_ctrl *mr_ctrl = data->mr_ctrl;
+ struct mlx5_mr *mr = NULL;
+ uintptr_t addr = (uintptr_t)memhdr->addr;
+ size_t len = memhdr->len;
+ struct mlx5_mr_cache entry;
+ uint32_t lkey;
+
+ /* If already registered, it should return. */
+ rte_rwlock_read_lock(&priv->mr.rwlock);
+ lkey = mr_lookup_dev(dev, &entry, addr);
+ rte_rwlock_read_unlock(&priv->mr.rwlock);
+ if (lkey != UINT32_MAX)
+ return;
+ mr = rte_zmalloc_socket(NULL,
+ RTE_ALIGN_CEIL(sizeof(*mr),
+ RTE_CACHE_LINE_SIZE),
+ RTE_CACHE_LINE_SIZE, mp->socket_id);
+ if (mr == NULL) {
+ DRV_LOG(WARNING,
+ "port %u unable to allocate memory for a new MR of"
+ " mempool (%s).",
+ dev->data->port_id, mp->name);
+ data->ret = -1;
+ return;
+ }
+ DRV_LOG(DEBUG, "port %u register MR for chunk #%d of mempool (%s)",
+ dev->data->port_id, mem_idx, mp->name);
+ mr->ibv_mr = mlx5_glue->reg_mr(priv->pd, (void *)addr, len,
+ IBV_ACCESS_LOCAL_WRITE);
+ if (mr->ibv_mr == NULL) {
+ DRV_LOG(WARNING,
+ "port %u fail to create a verbs MR for address (%p)",
+ dev->data->port_id, (void *)addr);
+ rte_free(mr);
+ data->ret = -1;
+ return;
+ }
+ mr->msl = NULL; /* Mark it is external memory. */
+ mr->ms_bmp = NULL;
+ mr->ms_n = 1;
+ mr->ms_bmp_n = 1;
+ rte_rwlock_write_lock(&priv->mr.rwlock);
+ LIST_INSERT_HEAD(&priv->mr.mr_list, mr, mr);
+ DRV_LOG(DEBUG,
+ "port %u MR CREATED (%p) for external memory %p:\n"
+ " [0x%" PRIxPTR ", 0x%" PRIxPTR "),"
+ " lkey=0x%x base_idx=%u ms_n=%u, ms_bmp_n=%u",
+ dev->data->port_id, (void *)mr, (void *)addr,
+ addr, addr + len, rte_cpu_to_be_32(mr->ibv_mr->lkey),
+ mr->ms_base_idx, mr->ms_n, mr->ms_bmp_n);
+ /* Insert to the global cache table. */
+ mr_insert_dev_cache(dev, mr);
+ rte_rwlock_write_unlock(&priv->mr.rwlock);
+ /* Insert to the local cache table */
+ mlx5_mr_addr2mr_bh(dev, mr_ctrl, addr);
+}
+
+/**
+ * Register MR for entire memory chunks in a Mempool having externally allocated
+ * memory and fill in local cache.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param mr_ctrl
+ * Pointer to per-queue MR control structure.
+ * @param mp
+ * Pointer to registering Mempool.
+ *
+ * @return
+ * 0 on success, -1 on failure.
+ */
+static uint32_t
+mlx5_mr_update_ext_mp(struct rte_eth_dev *dev, struct mlx5_mr_ctrl *mr_ctrl,
+ struct rte_mempool *mp)
+{
+ struct mr_update_mp_data data = {
+ .dev = dev,
+ .mr_ctrl = mr_ctrl,
+ .ret = 0,
+ };
+
+ rte_mempool_mem_iter(mp, mlx5_mr_update_ext_mp_cb, &data);
+ return data.ret;
+}
+
+/**
+ * Register MR entire memory chunks in a Mempool having externally allocated
+ * memory and search LKey of the address to return.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param addr
+ * Search key.
+ * @param mp
+ * Pointer to registering Mempool where addr belongs.
+ *
+ * @return
+ * LKey for address on success, UINT32_MAX on failure.
+ */
+uint32_t
+mlx5_tx_update_ext_mp(struct mlx5_txq_data *txq, uintptr_t addr,
+ struct rte_mempool *mp)
+{
+ struct mlx5_txq_ctrl *txq_ctrl =
+ container_of(txq, struct mlx5_txq_ctrl, txq);
+ struct mlx5_mr_ctrl *mr_ctrl = &txq->mr_ctrl;
+ struct priv *priv = txq_ctrl->priv;
+
+ mlx5_mr_update_ext_mp(ETH_DEV(priv), mr_ctrl, mp);
+ return mlx5_tx_addr2mr_bh(txq, addr);
+}
+
/* Called during rte_mempool_mem_iter() by mlx5_mr_update_mp(). */
static void
mlx5_mr_update_mp_cb(struct rte_mempool *mp __rte_unused, void *opaque,
@@ -1104,6 +1255,10 @@ mlx5_mr_update_mp(struct rte_eth_dev *dev, struct mlx5_mr_ctrl *mr_ctrl,
};
rte_mempool_mem_iter(mp, mlx5_mr_update_mp_cb, &data);
+ if (data.ret < 0 && rte_errno == ENXIO) {
+ /* Mempool may have externally allocated memory. */
+ return mlx5_mr_update_ext_mp(dev, mr_ctrl, mp);
+ }
return data.ret;
}