Hao | ba73657 | 2020-09-12 02:05:29 +0800 | [diff] [blame] | 1 | |
| 2 | #include <linux/netdevice.h> |
| 3 | #include <linux/ethtool.h> |
| 4 | #if IFNAMSIZ != 16 |
| 5 | #error "IFNAMSIZ != 16 is not supported" |
| 6 | #endif |
| 7 | #define MAX_QUEUE_NUM 1024 |
| 8 | |
| 9 | /** |
| 10 | * This union is use to store name of the specified interface |
| 11 | * and read it as two different data types |
| 12 | */ |
| 13 | union name_buf{ |
| 14 | char name[IFNAMSIZ]; |
| 15 | struct { |
| 16 | u64 hi; |
| 17 | u64 lo; |
| 18 | }name_int; |
| 19 | }; |
| 20 | |
| 21 | /* data retrieved in tracepoints */ |
| 22 | struct queue_data{ |
| 23 | u64 total_pkt_len; |
| 24 | u32 num_pkt; |
| 25 | u32 size_64B; |
| 26 | u32 size_512B; |
| 27 | u32 size_2K; |
| 28 | u32 size_16K; |
| 29 | u32 size_64K; |
| 30 | }; |
| 31 | |
| 32 | /* array of length 1 for device name */ |
| 33 | BPF_ARRAY(name_map, union name_buf, 1); |
| 34 | /* table for transmit & receive packets */ |
| 35 | BPF_HASH(tx_q, u16, struct queue_data, MAX_QUEUE_NUM); |
| 36 | BPF_HASH(rx_q, u16, struct queue_data, MAX_QUEUE_NUM); |
| 37 | |
| 38 | static inline int name_filter(struct sk_buff* skb){ |
| 39 | /* get device name from skb */ |
| 40 | union name_buf real_devname; |
| 41 | struct net_device *dev; |
| 42 | bpf_probe_read(&dev, sizeof(skb->dev), ((char *)skb + offsetof(struct sk_buff, dev))); |
| 43 | bpf_probe_read(&real_devname, IFNAMSIZ, dev->name); |
| 44 | |
| 45 | int key=0; |
| 46 | union name_buf *leaf = name_map.lookup(&key); |
| 47 | if(!leaf){ |
| 48 | return 0; |
| 49 | } |
| 50 | if((leaf->name_int).hi != real_devname.name_int.hi || (leaf->name_int).lo != real_devname.name_int.lo){ |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | static void updata_data(struct queue_data *data, u64 len){ |
| 58 | data->total_pkt_len += len; |
| 59 | data->num_pkt ++; |
| 60 | if(len / 64 == 0){ |
| 61 | data->size_64B ++; |
| 62 | } |
| 63 | else if(len / 512 == 0){ |
| 64 | data->size_512B ++; |
| 65 | } |
| 66 | else if(len / 2048 == 0){ |
| 67 | data->size_2K ++; |
| 68 | } |
| 69 | else if(len / 16384 == 0){ |
| 70 | data->size_16K ++; |
| 71 | } |
| 72 | else if(len / 65536 == 0){ |
| 73 | data->size_64K ++; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | TRACEPOINT_PROBE(net, net_dev_start_xmit){ |
| 78 | /* read device name */ |
| 79 | struct sk_buff* skb = (struct sk_buff*)args->skbaddr; |
| 80 | if(!name_filter(skb)){ |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | /* update table */ |
| 85 | u16 qid = skb->queue_mapping; |
| 86 | struct queue_data newdata; |
| 87 | __builtin_memset(&newdata, 0, sizeof(newdata)); |
| 88 | struct queue_data *data = tx_q.lookup_or_try_init(&qid, &newdata); |
| 89 | if(!data){ |
| 90 | return 0; |
| 91 | } |
| 92 | updata_data(data, skb->len); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | TRACEPOINT_PROBE(net, netif_receive_skb){ |
zhenwei pi | a55192b | 2020-12-21 19:49:36 +0800 | [diff] [blame] | 98 | struct sk_buff skb; |
| 99 | |
| 100 | bpf_probe_read(&skb, sizeof(skb), args->skbaddr); |
| 101 | if(!name_filter(&skb)){ |
Hao | ba73657 | 2020-09-12 02:05:29 +0800 | [diff] [blame] | 102 | return 0; |
| 103 | } |
| 104 | |
zhenwei pi | a55192b | 2020-12-21 19:49:36 +0800 | [diff] [blame] | 105 | /* case 1: if the NIC does not support multi-queue feature, there is only |
| 106 | * one queue(qid is always 0). |
| 107 | * case 2: if the NIC supports multi-queue feature, there are several queues |
| 108 | * with different qid(from 0 to n-1). |
| 109 | * The net device driver should mark queue id by API 'skb_record_rx_queue' |
| 110 | * for a recieved skb, otherwise it should be a BUG(all of the packets are |
| 111 | * reported as queue 0). For example, virtio net driver is fixed for linux: |
| 112 | * commit: 133bbb18ab1a2("virtio-net: per-queue RPS config") |
| 113 | */ |
| 114 | u16 qid = 0; |
| 115 | if (skb_rx_queue_recorded(&skb)) |
| 116 | qid = skb_get_rx_queue(&skb); |
| 117 | |
Hao | ba73657 | 2020-09-12 02:05:29 +0800 | [diff] [blame] | 118 | struct queue_data newdata; |
| 119 | __builtin_memset(&newdata, 0, sizeof(newdata)); |
| 120 | struct queue_data *data = rx_q.lookup_or_try_init(&qid, &newdata); |
| 121 | if(!data){ |
| 122 | return 0; |
| 123 | } |
zhenwei pi | a55192b | 2020-12-21 19:49:36 +0800 | [diff] [blame] | 124 | updata_data(data, skb.len); |
Hao | ba73657 | 2020-09-12 02:05:29 +0800 | [diff] [blame] | 125 | |
| 126 | return 0; |
| 127 | } |