diff options
Diffstat (limited to 'drivers/net/mlx4/mlx4_mr.h')
| -rw-r--r-- | drivers/net/mlx4/mlx4_mr.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/net/mlx4/mlx4_mr.h b/drivers/net/mlx4/mlx4_mr.h new file mode 100644 index 00000000..37a365a8 --- /dev/null +++ b/drivers/net/mlx4/mlx4_mr.h @@ -0,0 +1,122 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright 2018 6WIND S.A. + * Copyright 2018 Mellanox Technologies, Ltd + */ + +#ifndef RTE_PMD_MLX4_MR_H_ +#define RTE_PMD_MLX4_MR_H_ + +#include <stddef.h> +#include <stdint.h> +#include <sys/queue.h> + +/* Verbs headers do not support -pedantic. */ +#ifdef PEDANTIC +#pragma GCC diagnostic ignored "-Wpedantic" +#endif +#include <infiniband/verbs.h> +#ifdef PEDANTIC +#pragma GCC diagnostic error "-Wpedantic" +#endif + +#include <rte_eal_memconfig.h> +#include <rte_ethdev.h> +#include <rte_rwlock.h> +#include <rte_bitmap.h> + +/* Size of per-queue MR cache array for linear search. */ +#define MLX4_MR_CACHE_N 8 + +/* Size of MR cache table for binary search. */ +#define MLX4_MR_BTREE_CACHE_N 256 + +/* Memory Region object. */ +struct mlx4_mr { + LIST_ENTRY(mlx4_mr) mr; /**< Pointer to the prev/next entry. */ + struct ibv_mr *ibv_mr; /* Verbs Memory Region. */ + const struct rte_memseg_list *msl; + int ms_base_idx; /* Start index of msl->memseg_arr[]. */ + int ms_n; /* Number of memsegs in use. */ + uint32_t ms_bmp_n; /* Number of bits in memsegs bit-mask. */ + struct rte_bitmap *ms_bmp; /* Bit-mask of memsegs belonged to MR. */ +}; + +/* Cache entry for Memory Region. */ +struct mlx4_mr_cache { + uintptr_t start; /* Start address of MR. */ + uintptr_t end; /* End address of MR. */ + uint32_t lkey; /* rte_cpu_to_be_32(ibv_mr->lkey). */ +} __rte_packed; + +/* MR Cache table for Binary search. */ +struct mlx4_mr_btree { + uint16_t len; /* Number of entries. */ + uint16_t size; /* Total number of entries. */ + int overflow; /* Mark failure of table expansion. */ + struct mlx4_mr_cache (*table)[]; +} __rte_packed; + +/* Per-queue MR control descriptor. */ +struct mlx4_mr_ctrl { + uint32_t *dev_gen_ptr; /* Generation number of device to poll. */ + uint32_t cur_gen; /* Generation number saved to flush caches. */ + uint16_t mru; /* Index of last hit entry in top-half cache. */ + uint16_t head; /* Index of the oldest entry in top-half cache. */ + struct mlx4_mr_cache cache[MLX4_MR_CACHE_N]; /* Cache for top-half. */ + struct mlx4_mr_btree cache_bh; /* Cache for bottom-half. */ +} __rte_packed; + +extern struct mlx4_dev_list mlx4_mem_event_cb_list; +extern rte_rwlock_t mlx4_mem_event_rwlock; + +/* First entry must be NULL for comparison. */ +#define mlx4_mr_btree_len(bt) ((bt)->len - 1) + +int mlx4_mr_btree_init(struct mlx4_mr_btree *bt, int n, int socket); +void mlx4_mr_btree_free(struct mlx4_mr_btree *bt); +void mlx4_mr_btree_dump(struct mlx4_mr_btree *bt); +void mlx4_mr_mem_event_cb(enum rte_mem_event event_type, const void *addr, + size_t len, void *arg); +int mlx4_mr_update_mp(struct rte_eth_dev *dev, struct mlx4_mr_ctrl *mr_ctrl, + struct rte_mempool *mp); +void mlx4_mr_dump_dev(struct rte_eth_dev *dev); +void mlx4_mr_release(struct rte_eth_dev *dev); + +/** + * Look up LKey from given lookup table by linear search. Firstly look up the + * last-hit entry. If miss, the entire array is searched. If found, update the + * last-hit index and return LKey. + * + * @param lkp_tbl + * Pointer to lookup table. + * @param[in,out] cached_idx + * Pointer to last-hit index. + * @param n + * Size of lookup table. + * @param addr + * Search key. + * + * @return + * Searched LKey on success, UINT32_MAX on no match. + */ +static __rte_always_inline uint32_t +mlx4_mr_lookup_cache(struct mlx4_mr_cache *lkp_tbl, uint16_t *cached_idx, + uint16_t n, uintptr_t addr) +{ + uint16_t idx; + + if (likely(addr >= lkp_tbl[*cached_idx].start && + addr < lkp_tbl[*cached_idx].end)) + return lkp_tbl[*cached_idx].lkey; + for (idx = 0; idx < n && lkp_tbl[idx].start != 0; ++idx) { + if (addr >= lkp_tbl[idx].start && + addr < lkp_tbl[idx].end) { + /* Found. */ + *cached_idx = idx; + return lkp_tbl[idx].lkey; + } + } + return UINT32_MAX; +} + +#endif /* RTE_PMD_MLX4_MR_H_ */ |