480 lines
12 KiB
C
480 lines
12 KiB
C
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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#include <linux/bpf.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/jiffies.h>
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#include <linux/skbuff.h>
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#include <linux/timekeeping.h>
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#include "../ccm.h"
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#include "../nfp_app.h"
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#include "../nfp_net.h"
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#include "fw.h"
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#include "main.h"
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static struct sk_buff *
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nfp_bpf_cmsg_alloc(struct nfp_app_bpf *bpf, unsigned int size)
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{
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struct sk_buff *skb;
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skb = nfp_app_ctrl_msg_alloc(bpf->app, size, GFP_KERNEL);
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skb_put(skb, size);
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return skb;
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}
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static unsigned int
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nfp_bpf_cmsg_map_req_size(struct nfp_app_bpf *bpf, unsigned int n)
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{
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unsigned int size;
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size = sizeof(struct cmsg_req_map_op);
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size += (bpf->cmsg_key_sz + bpf->cmsg_val_sz) * n;
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return size;
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}
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static struct sk_buff *
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nfp_bpf_cmsg_map_req_alloc(struct nfp_app_bpf *bpf, unsigned int n)
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{
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return nfp_bpf_cmsg_alloc(bpf, nfp_bpf_cmsg_map_req_size(bpf, n));
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}
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static unsigned int
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nfp_bpf_cmsg_map_reply_size(struct nfp_app_bpf *bpf, unsigned int n)
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{
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unsigned int size;
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size = sizeof(struct cmsg_reply_map_op);
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size += (bpf->cmsg_key_sz + bpf->cmsg_val_sz) * n;
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return size;
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}
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static int
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nfp_bpf_ctrl_rc_to_errno(struct nfp_app_bpf *bpf,
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struct cmsg_reply_map_simple *reply)
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{
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static const int res_table[] = {
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[CMSG_RC_SUCCESS] = 0,
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[CMSG_RC_ERR_MAP_FD] = -EBADFD,
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[CMSG_RC_ERR_MAP_NOENT] = -ENOENT,
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[CMSG_RC_ERR_MAP_ERR] = -EINVAL,
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[CMSG_RC_ERR_MAP_PARSE] = -EIO,
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[CMSG_RC_ERR_MAP_EXIST] = -EEXIST,
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[CMSG_RC_ERR_MAP_NOMEM] = -ENOMEM,
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[CMSG_RC_ERR_MAP_E2BIG] = -E2BIG,
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};
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u32 rc;
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rc = be32_to_cpu(reply->rc);
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if (rc >= ARRAY_SIZE(res_table)) {
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cmsg_warn(bpf, "FW responded with invalid status: %u\n", rc);
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return -EIO;
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}
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return res_table[rc];
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}
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long long int
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nfp_bpf_ctrl_alloc_map(struct nfp_app_bpf *bpf, struct bpf_map *map)
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{
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struct cmsg_reply_map_alloc_tbl *reply;
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struct cmsg_req_map_alloc_tbl *req;
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struct sk_buff *skb;
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u32 tid;
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int err;
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skb = nfp_bpf_cmsg_alloc(bpf, sizeof(*req));
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if (!skb)
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return -ENOMEM;
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req = (void *)skb->data;
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req->key_size = cpu_to_be32(map->key_size);
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req->value_size = cpu_to_be32(map->value_size);
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req->max_entries = cpu_to_be32(map->max_entries);
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req->map_type = cpu_to_be32(map->map_type);
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req->map_flags = 0;
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skb = nfp_ccm_communicate(&bpf->ccm, skb, NFP_CCM_TYPE_BPF_MAP_ALLOC,
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sizeof(*reply));
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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reply = (void *)skb->data;
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err = nfp_bpf_ctrl_rc_to_errno(bpf, &reply->reply_hdr);
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if (err)
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goto err_free;
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tid = be32_to_cpu(reply->tid);
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dev_consume_skb_any(skb);
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return tid;
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err_free:
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dev_kfree_skb_any(skb);
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return err;
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}
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void nfp_bpf_ctrl_free_map(struct nfp_app_bpf *bpf, struct nfp_bpf_map *nfp_map)
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{
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struct cmsg_reply_map_free_tbl *reply;
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struct cmsg_req_map_free_tbl *req;
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struct sk_buff *skb;
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int err;
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skb = nfp_bpf_cmsg_alloc(bpf, sizeof(*req));
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if (!skb) {
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cmsg_warn(bpf, "leaking map - failed to allocate msg\n");
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return;
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}
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req = (void *)skb->data;
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req->tid = cpu_to_be32(nfp_map->tid);
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skb = nfp_ccm_communicate(&bpf->ccm, skb, NFP_CCM_TYPE_BPF_MAP_FREE,
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sizeof(*reply));
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if (IS_ERR(skb)) {
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cmsg_warn(bpf, "leaking map - I/O error\n");
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return;
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}
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reply = (void *)skb->data;
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err = nfp_bpf_ctrl_rc_to_errno(bpf, &reply->reply_hdr);
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if (err)
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cmsg_warn(bpf, "leaking map - FW responded with: %d\n", err);
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dev_consume_skb_any(skb);
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}
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static void *
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nfp_bpf_ctrl_req_key(struct nfp_app_bpf *bpf, struct cmsg_req_map_op *req,
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unsigned int n)
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{
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return &req->data[bpf->cmsg_key_sz * n + bpf->cmsg_val_sz * n];
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}
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static void *
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nfp_bpf_ctrl_req_val(struct nfp_app_bpf *bpf, struct cmsg_req_map_op *req,
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unsigned int n)
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{
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return &req->data[bpf->cmsg_key_sz * (n + 1) + bpf->cmsg_val_sz * n];
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}
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static void *
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nfp_bpf_ctrl_reply_key(struct nfp_app_bpf *bpf, struct cmsg_reply_map_op *reply,
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unsigned int n)
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{
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return &reply->data[bpf->cmsg_key_sz * n + bpf->cmsg_val_sz * n];
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}
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static void *
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nfp_bpf_ctrl_reply_val(struct nfp_app_bpf *bpf, struct cmsg_reply_map_op *reply,
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unsigned int n)
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{
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return &reply->data[bpf->cmsg_key_sz * (n + 1) + bpf->cmsg_val_sz * n];
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}
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static bool nfp_bpf_ctrl_op_cache_invalidate(enum nfp_ccm_type op)
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{
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return op == NFP_CCM_TYPE_BPF_MAP_UPDATE ||
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op == NFP_CCM_TYPE_BPF_MAP_DELETE;
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}
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static bool nfp_bpf_ctrl_op_cache_capable(enum nfp_ccm_type op)
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{
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return op == NFP_CCM_TYPE_BPF_MAP_LOOKUP ||
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op == NFP_CCM_TYPE_BPF_MAP_GETNEXT;
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}
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static bool nfp_bpf_ctrl_op_cache_fill(enum nfp_ccm_type op)
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{
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return op == NFP_CCM_TYPE_BPF_MAP_GETFIRST ||
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op == NFP_CCM_TYPE_BPF_MAP_GETNEXT;
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}
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static unsigned int
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nfp_bpf_ctrl_op_cache_get(struct nfp_bpf_map *nfp_map, enum nfp_ccm_type op,
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const u8 *key, u8 *out_key, u8 *out_value,
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u32 *cache_gen)
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{
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struct bpf_map *map = &nfp_map->offmap->map;
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struct nfp_app_bpf *bpf = nfp_map->bpf;
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unsigned int i, count, n_entries;
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struct cmsg_reply_map_op *reply;
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n_entries = nfp_bpf_ctrl_op_cache_fill(op) ? bpf->cmsg_cache_cnt : 1;
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spin_lock(&nfp_map->cache_lock);
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*cache_gen = nfp_map->cache_gen;
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if (nfp_map->cache_blockers)
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n_entries = 1;
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if (nfp_bpf_ctrl_op_cache_invalidate(op))
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goto exit_block;
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if (!nfp_bpf_ctrl_op_cache_capable(op))
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goto exit_unlock;
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if (!nfp_map->cache)
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goto exit_unlock;
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if (nfp_map->cache_to < ktime_get_ns())
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goto exit_invalidate;
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reply = (void *)nfp_map->cache->data;
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count = be32_to_cpu(reply->count);
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for (i = 0; i < count; i++) {
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void *cached_key;
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cached_key = nfp_bpf_ctrl_reply_key(bpf, reply, i);
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if (memcmp(cached_key, key, map->key_size))
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continue;
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if (op == NFP_CCM_TYPE_BPF_MAP_LOOKUP)
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memcpy(out_value, nfp_bpf_ctrl_reply_val(bpf, reply, i),
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map->value_size);
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if (op == NFP_CCM_TYPE_BPF_MAP_GETNEXT) {
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if (i + 1 == count)
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break;
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memcpy(out_key,
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nfp_bpf_ctrl_reply_key(bpf, reply, i + 1),
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map->key_size);
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}
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n_entries = 0;
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goto exit_unlock;
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}
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goto exit_unlock;
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exit_block:
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nfp_map->cache_blockers++;
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exit_invalidate:
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dev_consume_skb_any(nfp_map->cache);
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nfp_map->cache = NULL;
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exit_unlock:
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spin_unlock(&nfp_map->cache_lock);
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return n_entries;
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}
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static void
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nfp_bpf_ctrl_op_cache_put(struct nfp_bpf_map *nfp_map, enum nfp_ccm_type op,
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struct sk_buff *skb, u32 cache_gen)
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{
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bool blocker, filler;
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blocker = nfp_bpf_ctrl_op_cache_invalidate(op);
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filler = nfp_bpf_ctrl_op_cache_fill(op);
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if (blocker || filler) {
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u64 to = 0;
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if (filler)
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to = ktime_get_ns() + NFP_BPF_MAP_CACHE_TIME_NS;
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spin_lock(&nfp_map->cache_lock);
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if (blocker) {
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nfp_map->cache_blockers--;
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nfp_map->cache_gen++;
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}
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if (filler && !nfp_map->cache_blockers &&
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nfp_map->cache_gen == cache_gen) {
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nfp_map->cache_to = to;
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swap(nfp_map->cache, skb);
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}
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spin_unlock(&nfp_map->cache_lock);
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}
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dev_consume_skb_any(skb);
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}
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static int
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nfp_bpf_ctrl_entry_op(struct bpf_offloaded_map *offmap, enum nfp_ccm_type op,
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u8 *key, u8 *value, u64 flags, u8 *out_key, u8 *out_value)
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{
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struct nfp_bpf_map *nfp_map = offmap->dev_priv;
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unsigned int n_entries, reply_entries, count;
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struct nfp_app_bpf *bpf = nfp_map->bpf;
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struct bpf_map *map = &offmap->map;
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struct cmsg_reply_map_op *reply;
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struct cmsg_req_map_op *req;
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struct sk_buff *skb;
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u32 cache_gen;
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int err;
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/* FW messages have no space for more than 32 bits of flags */
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if (flags >> 32)
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return -EOPNOTSUPP;
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/* Handle op cache */
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n_entries = nfp_bpf_ctrl_op_cache_get(nfp_map, op, key, out_key,
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out_value, &cache_gen);
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if (!n_entries)
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return 0;
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skb = nfp_bpf_cmsg_map_req_alloc(bpf, 1);
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if (!skb) {
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err = -ENOMEM;
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goto err_cache_put;
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}
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req = (void *)skb->data;
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req->tid = cpu_to_be32(nfp_map->tid);
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req->count = cpu_to_be32(n_entries);
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req->flags = cpu_to_be32(flags);
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/* Copy inputs */
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if (key)
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memcpy(nfp_bpf_ctrl_req_key(bpf, req, 0), key, map->key_size);
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if (value)
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memcpy(nfp_bpf_ctrl_req_val(bpf, req, 0), value,
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map->value_size);
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skb = nfp_ccm_communicate(&bpf->ccm, skb, op, 0);
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if (IS_ERR(skb)) {
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err = PTR_ERR(skb);
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goto err_cache_put;
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}
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if (skb->len < sizeof(*reply)) {
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cmsg_warn(bpf, "cmsg drop - type 0x%02x too short %d!\n",
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op, skb->len);
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err = -EIO;
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goto err_free;
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}
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reply = (void *)skb->data;
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count = be32_to_cpu(reply->count);
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err = nfp_bpf_ctrl_rc_to_errno(bpf, &reply->reply_hdr);
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/* FW responds with message sized to hold the good entries,
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* plus one extra entry if there was an error.
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*/
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reply_entries = count + !!err;
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if (n_entries > 1 && count)
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err = 0;
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if (err)
|
||
|
|
goto err_free;
|
||
|
|
|
||
|
|
if (skb->len != nfp_bpf_cmsg_map_reply_size(bpf, reply_entries)) {
|
||
|
|
cmsg_warn(bpf, "cmsg drop - type 0x%02x too short %d for %d entries!\n",
|
||
|
|
op, skb->len, reply_entries);
|
||
|
|
err = -EIO;
|
||
|
|
goto err_free;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Copy outputs */
|
||
|
|
if (out_key)
|
||
|
|
memcpy(out_key, nfp_bpf_ctrl_reply_key(bpf, reply, 0),
|
||
|
|
map->key_size);
|
||
|
|
if (out_value)
|
||
|
|
memcpy(out_value, nfp_bpf_ctrl_reply_val(bpf, reply, 0),
|
||
|
|
map->value_size);
|
||
|
|
|
||
|
|
nfp_bpf_ctrl_op_cache_put(nfp_map, op, skb, cache_gen);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
err_free:
|
||
|
|
dev_kfree_skb_any(skb);
|
||
|
|
err_cache_put:
|
||
|
|
nfp_bpf_ctrl_op_cache_put(nfp_map, op, NULL, cache_gen);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
int nfp_bpf_ctrl_update_entry(struct bpf_offloaded_map *offmap,
|
||
|
|
void *key, void *value, u64 flags)
|
||
|
|
{
|
||
|
|
return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_UPDATE,
|
||
|
|
key, value, flags, NULL, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int nfp_bpf_ctrl_del_entry(struct bpf_offloaded_map *offmap, void *key)
|
||
|
|
{
|
||
|
|
return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_DELETE,
|
||
|
|
key, NULL, 0, NULL, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int nfp_bpf_ctrl_lookup_entry(struct bpf_offloaded_map *offmap,
|
||
|
|
void *key, void *value)
|
||
|
|
{
|
||
|
|
return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_LOOKUP,
|
||
|
|
key, NULL, 0, NULL, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
int nfp_bpf_ctrl_getfirst_entry(struct bpf_offloaded_map *offmap,
|
||
|
|
void *next_key)
|
||
|
|
{
|
||
|
|
return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_GETFIRST,
|
||
|
|
NULL, NULL, 0, next_key, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int nfp_bpf_ctrl_getnext_entry(struct bpf_offloaded_map *offmap,
|
||
|
|
void *key, void *next_key)
|
||
|
|
{
|
||
|
|
return nfp_bpf_ctrl_entry_op(offmap, NFP_CCM_TYPE_BPF_MAP_GETNEXT,
|
||
|
|
key, NULL, 0, next_key, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned int nfp_bpf_ctrl_cmsg_min_mtu(struct nfp_app_bpf *bpf)
|
||
|
|
{
|
||
|
|
return max(nfp_bpf_cmsg_map_req_size(bpf, 1),
|
||
|
|
nfp_bpf_cmsg_map_reply_size(bpf, 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned int nfp_bpf_ctrl_cmsg_mtu(struct nfp_app_bpf *bpf)
|
||
|
|
{
|
||
|
|
return max3(NFP_NET_DEFAULT_MTU,
|
||
|
|
nfp_bpf_cmsg_map_req_size(bpf, NFP_BPF_MAP_CACHE_CNT),
|
||
|
|
nfp_bpf_cmsg_map_reply_size(bpf, NFP_BPF_MAP_CACHE_CNT));
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned int nfp_bpf_ctrl_cmsg_cache_cnt(struct nfp_app_bpf *bpf)
|
||
|
|
{
|
||
|
|
unsigned int mtu, req_max, reply_max, entry_sz;
|
||
|
|
|
||
|
|
mtu = bpf->app->ctrl->dp.mtu;
|
||
|
|
entry_sz = bpf->cmsg_key_sz + bpf->cmsg_val_sz;
|
||
|
|
req_max = (mtu - sizeof(struct cmsg_req_map_op)) / entry_sz;
|
||
|
|
reply_max = (mtu - sizeof(struct cmsg_reply_map_op)) / entry_sz;
|
||
|
|
|
||
|
|
return min3(req_max, reply_max, NFP_BPF_MAP_CACHE_CNT);
|
||
|
|
}
|
||
|
|
|
||
|
|
void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
if (unlikely(skb->len < sizeof(struct cmsg_reply_map_simple))) {
|
||
|
|
cmsg_warn(bpf, "cmsg drop - too short %d!\n", skb->len);
|
||
|
|
dev_kfree_skb_any(skb);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (nfp_ccm_get_type(skb) == NFP_CCM_TYPE_BPF_BPF_EVENT) {
|
||
|
|
if (!nfp_bpf_event_output(bpf, skb->data, skb->len))
|
||
|
|
dev_consume_skb_any(skb);
|
||
|
|
else
|
||
|
|
dev_kfree_skb_any(skb);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
nfp_ccm_rx(&bpf->ccm, skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
nfp_bpf_ctrl_msg_rx_raw(struct nfp_app *app, const void *data, unsigned int len)
|
||
|
|
{
|
||
|
|
const struct nfp_ccm_hdr *hdr = data;
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
if (unlikely(len < sizeof(struct cmsg_reply_map_simple))) {
|
||
|
|
cmsg_warn(bpf, "cmsg drop - too short %d!\n", len);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hdr->type == NFP_CCM_TYPE_BPF_BPF_EVENT)
|
||
|
|
nfp_bpf_event_output(bpf, data, len);
|
||
|
|
else
|
||
|
|
cmsg_warn(bpf, "cmsg drop - msg type %d with raw buffer!\n",
|
||
|
|
hdr->type);
|
||
|
|
}
|