--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright 2016 6WIND S.A.
+ * Copyright 2016 Mellanox.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of 6WIND S.A. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* Verbs header. */
+/* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
+#ifdef PEDANTIC
+#pragma GCC diagnostic ignored "-pedantic"
+#endif
+#include <infiniband/verbs.h>
+#ifdef PEDANTIC
+#pragma GCC diagnostic error "-pedantic"
+#endif
+
+/* DPDK headers don't like -pedantic. */
+#ifdef PEDANTIC
+#pragma GCC diagnostic ignored "-pedantic"
+#endif
+#include <rte_mempool.h>
+#ifdef PEDANTIC
+#pragma GCC diagnostic error "-pedantic"
+#endif
+
+#include "mlx5.h"
+#include "mlx5_rxtx.h"
+
+struct mlx5_check_mempool_data {
+ int ret;
+ char *start;
+ char *end;
+};
+
+/* Called by mlx5_check_mempool() when iterating the memory chunks. */
+static void
+mlx5_check_mempool_cb(struct rte_mempool *mp,
+ void *opaque, struct rte_mempool_memhdr *memhdr,
+ unsigned int mem_idx)
+{
+ struct mlx5_check_mempool_data *data = opaque;
+
+ (void)mp;
+ (void)mem_idx;
+
+ /* It already failed, skip the next chunks. */
+ if (data->ret != 0)
+ return;
+ /* It is the first chunk. */
+ if (data->start == NULL && data->end == NULL) {
+ data->start = memhdr->addr;
+ data->end = data->start + memhdr->len;
+ return;
+ }
+ if (data->end == memhdr->addr) {
+ data->end += memhdr->len;
+ return;
+ }
+ if (data->start == (char *)memhdr->addr + memhdr->len) {
+ data->start -= memhdr->len;
+ return;
+ }
+ /* Error, mempool is not virtually contiguous. */
+ data->ret = -1;
+}
+
+/**
+ * Check if a mempool can be used: it must be virtually contiguous.
+ *
+ * @param[in] mp
+ * Pointer to memory pool.
+ * @param[out] start
+ * Pointer to the start address of the mempool virtual memory area
+ * @param[out] end
+ * Pointer to the end address of the mempool virtual memory area
+ *
+ * @return
+ * 0 on success (mempool is virtually contiguous), -1 on error.
+ */
+static int mlx5_check_mempool(struct rte_mempool *mp, uintptr_t *start,
+ uintptr_t *end)
+{
+ struct mlx5_check_mempool_data data;
+
+ memset(&data, 0, sizeof(data));
+ rte_mempool_mem_iter(mp, mlx5_check_mempool_cb, &data);
+ *start = (uintptr_t)data.start;
+ *end = (uintptr_t)data.end;
+
+ return data.ret;
+}
+
+/**
+ * Register mempool as a memory region.
+ *
+ * @param pd
+ * Pointer to protection domain.
+ * @param mp
+ * Pointer to memory pool.
+ *
+ * @return
+ * Memory region pointer, NULL in case of error.
+ */
+struct ibv_mr *
+mlx5_mp2mr(struct ibv_pd *pd, struct rte_mempool *mp)
+{
+ const struct rte_memseg *ms = rte_eal_get_physmem_layout();
+ uintptr_t start;
+ uintptr_t end;
+ unsigned int i;
+
+ if (mlx5_check_mempool(mp, &start, &end) != 0) {
+ ERROR("mempool %p: not virtually contiguous",
+ (void *)mp);
+ return NULL;
+ }
+
+ DEBUG("mempool %p area start=%p end=%p size=%zu",
+ (void *)mp, (void *)start, (void *)end,
+ (size_t)(end - start));
+ /* Round start and end to page boundary if found in memory segments. */
+ for (i = 0; (i < RTE_MAX_MEMSEG) && (ms[i].addr != NULL); ++i) {
+ uintptr_t addr = (uintptr_t)ms[i].addr;
+ size_t len = ms[i].len;
+ unsigned int align = ms[i].hugepage_sz;
+
+ if ((start > addr) && (start < addr + len))
+ start = RTE_ALIGN_FLOOR(start, align);
+ if ((end > addr) && (end < addr + len))
+ end = RTE_ALIGN_CEIL(end, align);
+ }
+ DEBUG("mempool %p using start=%p end=%p size=%zu for MR",
+ (void *)mp, (void *)start, (void *)end,
+ (size_t)(end - start));
+ return ibv_reg_mr(pd,
+ (void *)start,
+ end - start,
+ IBV_ACCESS_LOCAL_WRITE);
+}
+
+/**
+ * Register a Memory Region (MR) <-> Memory Pool (MP) association in
+ * txq->mp2mr[]. If mp2mr[] is full, remove an entry first.
+ *
+ * This function should only be called by txq_mp2mr().
+ *
+ * @param txq
+ * Pointer to TX queue structure.
+ * @param[in] mp
+ * Memory Pool for which a Memory Region lkey must be returned.
+ * @param idx
+ * Index of the next available entry.
+ *
+ * @return
+ * mr->lkey on success, (uint32_t)-1 on failure.
+ */
+uint32_t
+txq_mp2mr_reg(struct txq *txq, struct rte_mempool *mp, unsigned int idx)
+{
+ struct txq_ctrl *txq_ctrl = container_of(txq, struct txq_ctrl, txq);
+ struct ibv_mr *mr;
+
+ /* Add a new entry, register MR first. */
+ DEBUG("%p: discovered new memory pool \"%s\" (%p)",
+ (void *)txq_ctrl, mp->name, (void *)mp);
+ mr = mlx5_mp2mr(txq_ctrl->priv->pd, mp);
+ if (unlikely(mr == NULL)) {
+ DEBUG("%p: unable to configure MR, ibv_reg_mr() failed.",
+ (void *)txq_ctrl);
+ return (uint32_t)-1;
+ }
+ if (unlikely(idx == RTE_DIM(txq_ctrl->txq.mp2mr))) {
+ /* Table is full, remove oldest entry. */
+ DEBUG("%p: MR <-> MP table full, dropping oldest entry.",
+ (void *)txq_ctrl);
+ --idx;
+ claim_zero(ibv_dereg_mr(txq_ctrl->txq.mp2mr[0].mr));
+ memmove(&txq_ctrl->txq.mp2mr[0], &txq_ctrl->txq.mp2mr[1],
+ (sizeof(txq_ctrl->txq.mp2mr) -
+ sizeof(txq_ctrl->txq.mp2mr[0])));
+ }
+ /* Store the new entry. */
+ txq_ctrl->txq.mp2mr[idx].mp = mp;
+ txq_ctrl->txq.mp2mr[idx].mr = mr;
+ txq_ctrl->txq.mp2mr[idx].lkey = htonl(mr->lkey);
+ DEBUG("%p: new MR lkey for MP \"%s\" (%p): 0x%08" PRIu32,
+ (void *)txq_ctrl, mp->name, (void *)mp,
+ txq_ctrl->txq.mp2mr[idx].lkey);
+ return txq_ctrl->txq.mp2mr[idx].lkey;
+}
+
+struct txq_mp2mr_mbuf_check_data {
+ int ret;
+};
+
+/**
+ * Callback function for rte_mempool_obj_iter() to check whether a given
+ * mempool object looks like a mbuf.
+ *
+ * @param[in] mp
+ * The mempool pointer
+ * @param[in] arg
+ * Context data (struct txq_mp2mr_mbuf_check_data). Contains the
+ * return value.
+ * @param[in] obj
+ * Object address.
+ * @param index
+ * Object index, unused.
+ */
+static void
+txq_mp2mr_mbuf_check(struct rte_mempool *mp, void *arg, void *obj,
+ uint32_t index __rte_unused)
+{
+ struct txq_mp2mr_mbuf_check_data *data = arg;
+ struct rte_mbuf *buf = obj;
+
+ /*
+ * Check whether mbuf structure fits element size and whether mempool
+ * pointer is valid.
+ */
+ if (sizeof(*buf) > mp->elt_size || buf->pool != mp)
+ data->ret = -1;
+}
+
+/**
+ * Iterator function for rte_mempool_walk() to register existing mempools and
+ * fill the MP to MR cache of a TX queue.
+ *
+ * @param[in] mp
+ * Memory Pool to register.
+ * @param *arg
+ * Pointer to TX queue structure.
+ */
+void
+txq_mp2mr_iter(struct rte_mempool *mp, void *arg)
+{
+ struct txq_ctrl *txq_ctrl = arg;
+ struct txq_mp2mr_mbuf_check_data data = {
+ .ret = 0,
+ };
+ unsigned int i;
+
+ /* Register mempool only if the first element looks like a mbuf. */
+ if (rte_mempool_obj_iter(mp, txq_mp2mr_mbuf_check, &data) == 0 ||
+ data.ret == -1)
+ return;
+ for (i = 0; (i != RTE_DIM(txq_ctrl->txq.mp2mr)); ++i) {
+ if (unlikely(txq_ctrl->txq.mp2mr[i].mp == NULL)) {
+ /* Unknown MP, add a new MR for it. */
+ break;
+ }
+ if (txq_ctrl->txq.mp2mr[i].mp == mp)
+ return;
+ }
+ txq_mp2mr_reg(&txq_ctrl->txq, mp, i);
+}
Code Review / deb_dpdk.git / blobdiff