* Copyright 2016 6WIND S.A.
* Copyright 2020 Mellanox Technologies, Ltd
*/
+#include <stddef.h>
+
#include <rte_eal_memconfig.h>
+#include <rte_eal_paging.h>
#include <rte_errno.h>
#include <rte_mempool.h>
#include <rte_malloc.h>
const struct rte_memseg_list *msl;
};
+/* Virtual memory range. */
+struct mlx5_range {
+ uintptr_t start;
+ uintptr_t end;
+};
+
+/** Memory region for a mempool. */
+struct mlx5_mempool_mr {
+ struct mlx5_pmd_mr pmd_mr;
+ uint32_t refcnt; /**< Number of mempools sharing this MR. */
+};
+
+/* Mempool registration. */
+struct mlx5_mempool_reg {
+ LIST_ENTRY(mlx5_mempool_reg) next;
+ /** Registered mempool, used to designate registrations. */
+ struct rte_mempool *mp;
+ /** Memory regions for the address ranges of the mempool. */
+ struct mlx5_mempool_mr *mrs;
+ /** Number of memory regions. */
+ unsigned int mrs_n;
+};
+
/**
* Expand B-tree table to a given size. Can't be called with holding
* memory_hotplug_lock or share_cache.rwlock due to rte_realloc().
rte_rwlock_read_unlock(&share_cache->rwlock);
#endif
}
+
+static int
+mlx5_range_compare_start(const void *lhs, const void *rhs)
+{
+ const struct mlx5_range *r1 = lhs, *r2 = rhs;
+
+ if (r1->start > r2->start)
+ return 1;
+ else if (r1->start < r2->start)
+ return -1;
+ return 0;
+}
+
+static void
+mlx5_range_from_mempool_chunk(struct rte_mempool *mp, void *opaque,
+ struct rte_mempool_memhdr *memhdr,
+ unsigned int idx)
+{
+ struct mlx5_range *ranges = opaque, *range = &ranges[idx];
+ uint64_t page_size = rte_mem_page_size();
+
+ RTE_SET_USED(mp);
+ range->start = RTE_ALIGN_FLOOR((uintptr_t)memhdr->addr, page_size);
+ range->end = RTE_ALIGN_CEIL(range->start + memhdr->len, page_size);
+}
+
+/**
+ * Get VA-contiguous ranges of the mempool memory.
+ * Each range start and end is aligned to the system page size.
+ *
+ * @param[in] mp
+ * Analyzed mempool.
+ * @param[out] out
+ * Receives the ranges, caller must release it with free().
+ * @param[out] ount_n
+ * Receives the number of @p out elements.
+ *
+ * @return
+ * 0 on success, (-1) on failure.
+ */
+static int
+mlx5_get_mempool_ranges(struct rte_mempool *mp, struct mlx5_range **out,
+ unsigned int *out_n)
+{
+ struct mlx5_range *chunks;
+ unsigned int chunks_n = mp->nb_mem_chunks, contig_n, i;
+
+ /* Collect page-aligned memory ranges of the mempool. */
+ chunks = calloc(sizeof(chunks[0]), chunks_n);
+ if (chunks == NULL)
+ return -1;
+ rte_mempool_mem_iter(mp, mlx5_range_from_mempool_chunk, chunks);
+ /* Merge adjacent chunks and place them at the beginning. */
+ qsort(chunks, chunks_n, sizeof(chunks[0]), mlx5_range_compare_start);
+ contig_n = 1;
+ for (i = 1; i < chunks_n; i++)
+ if (chunks[i - 1].end != chunks[i].start) {
+ chunks[contig_n - 1].end = chunks[i - 1].end;
+ chunks[contig_n] = chunks[i];
+ contig_n++;
+ }
+ /* Extend the last contiguous chunk to the end of the mempool. */
+ chunks[contig_n - 1].end = chunks[i - 1].end;
+ *out = chunks;
+ *out_n = contig_n;
+ return 0;
+}
+
+/**
+ * Analyze mempool memory to select memory ranges to register.
+ *
+ * @param[in] mp
+ * Mempool to analyze.
+ * @param[out] out
+ * Receives memory ranges to register, aligned to the system page size.
+ * The caller must release them with free().
+ * @param[out] out_n
+ * Receives the number of @p out items.
+ * @param[out] share_hugepage
+ * Receives True if the entire pool resides within a single hugepage.
+ *
+ * @return
+ * 0 on success, (-1) on failure.
+ */
+static int
+mlx5_mempool_reg_analyze(struct rte_mempool *mp, struct mlx5_range **out,
+ unsigned int *out_n, bool *share_hugepage)
+{
+ struct mlx5_range *ranges = NULL;
+ unsigned int i, ranges_n = 0;
+ struct rte_memseg_list *msl;
+
+ if (mlx5_get_mempool_ranges(mp, &ranges, &ranges_n) < 0) {
+ DRV_LOG(ERR, "Cannot get address ranges for mempool %s",
+ mp->name);
+ return -1;
+ }
+ /* Check if the hugepage of the pool can be shared. */
+ *share_hugepage = false;
+ msl = rte_mem_virt2memseg_list((void *)ranges[0].start);
+ if (msl != NULL) {
+ uint64_t hugepage_sz = 0;
+
+ /* Check that all ranges are on pages of the same size. */
+ for (i = 0; i < ranges_n; i++) {
+ if (hugepage_sz != 0 && hugepage_sz != msl->page_sz)
+ break;
+ hugepage_sz = msl->page_sz;
+ }
+ if (i == ranges_n) {
+ /*
+ * If the entire pool is within one hugepage,
+ * combine all ranges into one of the hugepage size.
+ */
+ uintptr_t reg_start = ranges[0].start;
+ uintptr_t reg_end = ranges[ranges_n - 1].end;
+ uintptr_t hugepage_start =
+ RTE_ALIGN_FLOOR(reg_start, hugepage_sz);
+ uintptr_t hugepage_end = hugepage_start + hugepage_sz;
+ if (reg_end < hugepage_end) {
+ ranges[0].start = hugepage_start;
+ ranges[0].end = hugepage_end;
+ ranges_n = 1;
+ *share_hugepage = true;
+ }
+ }
+ }
+ *out = ranges;
+ *out_n = ranges_n;
+ return 0;
+}
+
+/** Create a registration object for the mempool. */
+static struct mlx5_mempool_reg *
+mlx5_mempool_reg_create(struct rte_mempool *mp, unsigned int mrs_n)
+{
+ struct mlx5_mempool_reg *mpr = NULL;
+
+ mpr = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO,
+ sizeof(*mpr) + mrs_n * sizeof(mpr->mrs[0]),
+ RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
+ if (mpr == NULL) {
+ DRV_LOG(ERR, "Cannot allocate mempool %s registration object",
+ mp->name);
+ return NULL;
+ }
+ mpr->mp = mp;
+ mpr->mrs = (struct mlx5_mempool_mr *)(mpr + 1);
+ mpr->mrs_n = mrs_n;
+ return mpr;
+}
+
+/**
+ * Destroy a mempool registration object.
+ *
+ * @param standalone
+ * Whether @p mpr owns its MRs excludively, i.e. they are not shared.
+ */
+static void
+mlx5_mempool_reg_destroy(struct mlx5_mr_share_cache *share_cache,
+ struct mlx5_mempool_reg *mpr, bool standalone)
+{
+ if (standalone) {
+ unsigned int i;
+
+ for (i = 0; i < mpr->mrs_n; i++)
+ share_cache->dereg_mr_cb(&mpr->mrs[i].pmd_mr);
+ }
+ mlx5_free(mpr);
+}
+
+/** Find registration object of a mempool. */
+static struct mlx5_mempool_reg *
+mlx5_mempool_reg_lookup(struct mlx5_mr_share_cache *share_cache,
+ struct rte_mempool *mp)
+{
+ struct mlx5_mempool_reg *mpr;
+
+ LIST_FOREACH(mpr, &share_cache->mempool_reg_list, next)
+ if (mpr->mp == mp)
+ break;
+ return mpr;
+}
+
+/** Increment reference counters of MRs used in the registration. */
+static void
+mlx5_mempool_reg_attach(struct mlx5_mempool_reg *mpr)
+{
+ unsigned int i;
+
+ for (i = 0; i < mpr->mrs_n; i++)
+ __atomic_add_fetch(&mpr->mrs[i].refcnt, 1, __ATOMIC_RELAXED);
+}
+
+/**
+ * Decrement reference counters of MRs used in the registration.
+ *
+ * @return True if no more references to @p mpr MRs exist, False otherwise.
+ */
+static bool
+mlx5_mempool_reg_detach(struct mlx5_mempool_reg *mpr)
+{
+ unsigned int i;
+ bool ret = false;
+
+ for (i = 0; i < mpr->mrs_n; i++)
+ ret |= __atomic_sub_fetch(&mpr->mrs[i].refcnt, 1,
+ __ATOMIC_RELAXED) == 0;
+ return ret;
+}
+
+static int
+mlx5_mr_mempool_register_primary(struct mlx5_mr_share_cache *share_cache,
+ void *pd, struct rte_mempool *mp)
+{
+ struct mlx5_range *ranges = NULL;
+ struct mlx5_mempool_reg *mpr, *new_mpr;
+ unsigned int i, ranges_n;
+ bool share_hugepage;
+ int ret = -1;
+
+ /* Early check to avoid unnecessary creation of MRs. */
+ rte_rwlock_read_lock(&share_cache->rwlock);
+ mpr = mlx5_mempool_reg_lookup(share_cache, mp);
+ rte_rwlock_read_unlock(&share_cache->rwlock);
+ if (mpr != NULL) {
+ DRV_LOG(DEBUG, "Mempool %s is already registered for PD %p",
+ mp->name, pd);
+ rte_errno = EEXIST;
+ goto exit;
+ }
+ if (mlx5_mempool_reg_analyze(mp, &ranges, &ranges_n,
+ &share_hugepage) < 0) {
+ DRV_LOG(ERR, "Cannot get mempool %s memory ranges", mp->name);
+ rte_errno = ENOMEM;
+ goto exit;
+ }
+ new_mpr = mlx5_mempool_reg_create(mp, ranges_n);
+ if (new_mpr == NULL) {
+ DRV_LOG(ERR,
+ "Cannot create a registration object for mempool %s in PD %p",
+ mp->name, pd);
+ rte_errno = ENOMEM;
+ goto exit;
+ }
+ /*
+ * If the entire mempool fits in a single hugepage, the MR for this
+ * hugepage can be shared across mempools that also fit in it.
+ */
+ if (share_hugepage) {
+ rte_rwlock_write_lock(&share_cache->rwlock);
+ LIST_FOREACH(mpr, &share_cache->mempool_reg_list, next) {
+ if (mpr->mrs[0].pmd_mr.addr == (void *)ranges[0].start)
+ break;
+ }
+ if (mpr != NULL) {
+ new_mpr->mrs = mpr->mrs;
+ mlx5_mempool_reg_attach(new_mpr);
+ LIST_INSERT_HEAD(&share_cache->mempool_reg_list,
+ new_mpr, next);
+ }
+ rte_rwlock_write_unlock(&share_cache->rwlock);
+ if (mpr != NULL) {
+ DRV_LOG(DEBUG, "Shared MR %#x in PD %p for mempool %s with mempool %s",
+ mpr->mrs[0].pmd_mr.lkey, pd, mp->name,
+ mpr->mp->name);
+ ret = 0;
+ goto exit;
+ }
+ }
+ for (i = 0; i < ranges_n; i++) {
+ struct mlx5_mempool_mr *mr = &new_mpr->mrs[i];
+ const struct mlx5_range *range = &ranges[i];
+ size_t len = range->end - range->start;
+
+ if (share_cache->reg_mr_cb(pd, (void *)range->start, len,
+ &mr->pmd_mr) < 0) {
+ DRV_LOG(ERR,
+ "Failed to create an MR in PD %p for address range "
+ "[0x%" PRIxPTR ", 0x%" PRIxPTR "] (%zu bytes) for mempool %s",
+ pd, range->start, range->end, len, mp->name);
+ break;
+ }
+ DRV_LOG(DEBUG,
+ "Created a new MR %#x in PD %p for address range "
+ "[0x%" PRIxPTR ", 0x%" PRIxPTR "] (%zu bytes) for mempool %s",
+ mr->pmd_mr.lkey, pd, range->start, range->end, len,
+ mp->name);
+ }
+ if (i != ranges_n) {
+ mlx5_mempool_reg_destroy(share_cache, new_mpr, true);
+ rte_errno = EINVAL;
+ goto exit;
+ }
+ /* Concurrent registration is not supposed to happen. */
+ rte_rwlock_write_lock(&share_cache->rwlock);
+ mpr = mlx5_mempool_reg_lookup(share_cache, mp);
+ if (mpr == NULL) {
+ mlx5_mempool_reg_attach(new_mpr);
+ LIST_INSERT_HEAD(&share_cache->mempool_reg_list,
+ new_mpr, next);
+ ret = 0;
+ }
+ rte_rwlock_write_unlock(&share_cache->rwlock);
+ if (mpr != NULL) {
+ DRV_LOG(DEBUG, "Mempool %s is already registered for PD %p",
+ mp->name, pd);
+ mlx5_mempool_reg_destroy(share_cache, new_mpr, true);
+ rte_errno = EEXIST;
+ goto exit;
+ }
+exit:
+ free(ranges);
+ return ret;
+}
+
+static int
+mlx5_mr_mempool_register_secondary(struct mlx5_mr_share_cache *share_cache,
+ void *pd, struct rte_mempool *mp,
+ struct mlx5_mp_id *mp_id)
+{
+ if (mp_id == NULL) {
+ rte_errno = EINVAL;
+ return -1;
+ }
+ return mlx5_mp_req_mempool_reg(mp_id, share_cache, pd, mp, true);
+}
+
+/**
+ * Register the memory of a mempool in the protection domain.
+ *
+ * @param share_cache
+ * Shared MR cache of the protection domain.
+ * @param pd
+ * Protection domain object.
+ * @param mp
+ * Mempool to register.
+ * @param mp_id
+ * Multi-process identifier, may be NULL for the primary process.
+ *
+ * @return
+ * 0 on success, (-1) on failure and rte_errno is set.
+ */
+int
+mlx5_mr_mempool_register(struct mlx5_mr_share_cache *share_cache, void *pd,
+ struct rte_mempool *mp, struct mlx5_mp_id *mp_id)
+{
+ if (mp->flags & MEMPOOL_F_NON_IO)
+ return 0;
+ switch (rte_eal_process_type()) {
+ case RTE_PROC_PRIMARY:
+ return mlx5_mr_mempool_register_primary(share_cache, pd, mp);
+ case RTE_PROC_SECONDARY:
+ return mlx5_mr_mempool_register_secondary(share_cache, pd, mp,
+ mp_id);
+ default:
+ return -1;
+ }
+}
+
+static int
+mlx5_mr_mempool_unregister_primary(struct mlx5_mr_share_cache *share_cache,
+ struct rte_mempool *mp)
+{
+ struct mlx5_mempool_reg *mpr;
+ bool standalone = false;
+
+ rte_rwlock_write_lock(&share_cache->rwlock);
+ LIST_FOREACH(mpr, &share_cache->mempool_reg_list, next)
+ if (mpr->mp == mp) {
+ LIST_REMOVE(mpr, next);
+ standalone = mlx5_mempool_reg_detach(mpr);
+ if (standalone)
+ /*
+ * The unlock operation below provides a memory
+ * barrier due to its store-release semantics.
+ */
+ ++share_cache->dev_gen;
+ break;
+ }
+ rte_rwlock_write_unlock(&share_cache->rwlock);
+ if (mpr == NULL) {
+ rte_errno = ENOENT;
+ return -1;
+ }
+ mlx5_mempool_reg_destroy(share_cache, mpr, standalone);
+ return 0;
+}
+
+static int
+mlx5_mr_mempool_unregister_secondary(struct mlx5_mr_share_cache *share_cache,
+ struct rte_mempool *mp,
+ struct mlx5_mp_id *mp_id)
+{
+ if (mp_id == NULL) {
+ rte_errno = EINVAL;
+ return -1;
+ }
+ return mlx5_mp_req_mempool_reg(mp_id, share_cache, NULL, mp, false);
+}
+
+/**
+ * Unregister the memory of a mempool from the protection domain.
+ *
+ * @param share_cache
+ * Shared MR cache of the protection domain.
+ * @param mp
+ * Mempool to unregister.
+ * @param mp_id
+ * Multi-process identifier, may be NULL for the primary process.
+ *
+ * @return
+ * 0 on success, (-1) on failure and rte_errno is set.
+ */
+int
+mlx5_mr_mempool_unregister(struct mlx5_mr_share_cache *share_cache,
+ struct rte_mempool *mp, struct mlx5_mp_id *mp_id)
+{
+ if (mp->flags & MEMPOOL_F_NON_IO)
+ return 0;
+ switch (rte_eal_process_type()) {
+ case RTE_PROC_PRIMARY:
+ return mlx5_mr_mempool_unregister_primary(share_cache, mp);
+ case RTE_PROC_SECONDARY:
+ return mlx5_mr_mempool_unregister_secondary(share_cache, mp,
+ mp_id);
+ default:
+ return -1;
+ }
+}
+
+/**
+ * Lookup a MR key by and address in a registered mempool.
+ *
+ * @param mpr
+ * Mempool registration object.
+ * @param addr
+ * Address within the mempool.
+ * @param entry
+ * Bottom-half cache entry to fill.
+ *
+ * @return
+ * MR key or UINT32_MAX on failure, which can only happen
+ * if the address is not from within the mempool.
+ */
+static uint32_t
+mlx5_mempool_reg_addr2mr(struct mlx5_mempool_reg *mpr, uintptr_t addr,
+ struct mr_cache_entry *entry)
+{
+ uint32_t lkey = UINT32_MAX;
+ unsigned int i;
+
+ for (i = 0; i < mpr->mrs_n; i++) {
+ const struct mlx5_pmd_mr *mr = &mpr->mrs[i].pmd_mr;
+ uintptr_t mr_addr = (uintptr_t)mr->addr;
+
+ if (mr_addr <= addr) {
+ lkey = rte_cpu_to_be_32(mr->lkey);
+ entry->start = mr_addr;
+ entry->end = mr_addr + mr->len;
+ entry->lkey = lkey;
+ break;
+ }
+ }
+ return lkey;
+}
+
+/**
+ * Update bottom-half cache from the list of mempool registrations.
+ *
+ * @param share_cache
+ * Pointer to a global shared MR cache.
+ * @param mr_ctrl
+ * Per-queue MR control handle.
+ * @param entry
+ * Pointer to an entry in the bottom-half cache to update
+ * with the MR lkey looked up.
+ * @param mp
+ * Mempool containing the address.
+ * @param addr
+ * Address to lookup.
+ * @return
+ * MR lkey on success, UINT32_MAX on failure.
+ */
+static uint32_t
+mlx5_lookup_mempool_regs(struct mlx5_mr_share_cache *share_cache,
+ struct mlx5_mr_ctrl *mr_ctrl,
+ struct mr_cache_entry *entry,
+ struct rte_mempool *mp, uintptr_t addr)
+{
+ struct mlx5_mr_btree *bt = &mr_ctrl->cache_bh;
+ struct mlx5_mempool_reg *mpr;
+ uint32_t lkey = UINT32_MAX;
+
+ /* If local cache table is full, try to double it. */
+ if (unlikely(bt->len == bt->size))
+ mr_btree_expand(bt, bt->size << 1);
+ /* Look up in mempool registrations. */
+ rte_rwlock_read_lock(&share_cache->rwlock);
+ mpr = mlx5_mempool_reg_lookup(share_cache, mp);
+ if (mpr != NULL)
+ lkey = mlx5_mempool_reg_addr2mr(mpr, addr, entry);
+ rte_rwlock_read_unlock(&share_cache->rwlock);
+ /*
+ * Update local cache. Even if it fails, return the found entry
+ * to update top-half cache. Next time, this entry will be found
+ * in the global cache.
+ */
+ if (lkey != UINT32_MAX)
+ mr_btree_insert(bt, entry);
+ return lkey;
+}
+
+/**
+ * Bottom-half lookup for the address from the mempool.
+ *
+ * @param share_cache
+ * Pointer to a global shared MR cache.
+ * @param mr_ctrl
+ * Per-queue MR control handle.
+ * @param mp
+ * Mempool containing the address.
+ * @param addr
+ * Address to lookup.
+ * @return
+ * MR lkey on success, UINT32_MAX on failure.
+ */
+uint32_t
+mlx5_mr_mempool2mr_bh(struct mlx5_mr_share_cache *share_cache,
+ struct mlx5_mr_ctrl *mr_ctrl,
+ struct rte_mempool *mp, uintptr_t addr)
+{
+ struct mr_cache_entry *repl = &mr_ctrl->cache[mr_ctrl->head];
+ uint32_t lkey;
+ uint16_t bh_idx = 0;
+
+ /* Binary-search MR translation table. */
+ lkey = mr_btree_lookup(&mr_ctrl->cache_bh, &bh_idx, addr);
+ /* Update top-half cache. */
+ if (likely(lkey != UINT32_MAX)) {
+ *repl = (*mr_ctrl->cache_bh.table)[bh_idx];
+ } else {
+ lkey = mlx5_lookup_mempool_regs(share_cache, mr_ctrl, repl,
+ mp, addr);
+ /* Can only fail if the address is not from the mempool. */
+ if (unlikely(lkey == UINT32_MAX))
+ return UINT32_MAX;
+ }
+ /* Update the most recently used entry. */
+ mr_ctrl->mru = mr_ctrl->head;
+ /* Point to the next victim, the oldest. */
+ mr_ctrl->head = (mr_ctrl->head + 1) % MLX5_MR_CACHE_N;
+ return lkey;
+}
git.droids-corp.org / dpdk.git / commitdiff