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samples/bpf: xdpsock: Add VLAN support for Tx-only operation
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In multi-queue environment testing, the support for VLAN-tag based
steering is useful. So, this patch adds the capability to add
VLAN tag (VLAN ID and Priority) to the generated Tx frame.

To set the VLAN ID=10 and Priority=2 for Tx only through TxQ=3:
 $ xdpsock -i eth0 -t -N -z -q 3 -V -J 10 -K 2

If VLAN ID (-J) and Priority (-K) is set, it default to
  VLAN ID = 1
  VLAN Priority = 0.

For example, VLAN-tagged Tx only, xdp copy mode through TxQ=1:
 $ xdpsock -i eth0 -t -N -c -q 1 -V

Signed-off-by: Ong Boon Leong <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
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@elvinongbl
elvinongbl authored and Alexei Starovoitov committed Jan 6, 2022
1 parent 5f60826 commit 2741a04
Showing 1 changed file with 75 additions and 15 deletions.
90 changes: 75 additions & 15 deletions samples/bpf/xdpsock_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,12 @@

#define DEBUG_HEXDUMP 0

#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT 13
#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
#define VLAN_VID__DEFAULT 1
#define VLAN_PRI__DEFAULT 0

typedef __u64 u64;
typedef __u32 u32;
typedef __u16 u16;
Expand All @@ -81,6 +87,9 @@ static u32 opt_batch_size = 64;
static int opt_pkt_count;
static u16 opt_pkt_size = MIN_PKT_SIZE;
static u32 opt_pkt_fill_pattern = 0x12345678;
static bool opt_vlan_tag;
static u16 opt_pkt_vlan_id = VLAN_VID__DEFAULT;
static u16 opt_pkt_vlan_pri = VLAN_PRI__DEFAULT;
static bool opt_extra_stats;
static bool opt_quiet;
static bool opt_app_stats;
Expand All @@ -101,6 +110,14 @@ static u32 prog_id;
static bool opt_busy_poll;
static bool opt_reduced_cap;

struct vlan_ethhdr {
unsigned char h_dest[6];
unsigned char h_source[6];
__be16 h_vlan_proto;
__be16 h_vlan_TCI;
__be16 h_vlan_encapsulated_proto;
};

struct xsk_ring_stats {
unsigned long rx_npkts;
unsigned long tx_npkts;
Expand Down Expand Up @@ -740,29 +757,56 @@ static inline u16 udp_csum(u32 saddr, u32 daddr, u32 len,

#define ETH_FCS_SIZE 4

#define PKT_HDR_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
#define ETH_HDR_SIZE (opt_vlan_tag ? sizeof(struct vlan_ethhdr) : \
sizeof(struct ethhdr))
#define PKT_HDR_SIZE (ETH_HDR_SIZE + sizeof(struct iphdr) + \
sizeof(struct udphdr))

#define PKT_SIZE (opt_pkt_size - ETH_FCS_SIZE)
#define IP_PKT_SIZE (PKT_SIZE - sizeof(struct ethhdr))
#define IP_PKT_SIZE (PKT_SIZE - ETH_HDR_SIZE)
#define UDP_PKT_SIZE (IP_PKT_SIZE - sizeof(struct iphdr))
#define UDP_PKT_DATA_SIZE (UDP_PKT_SIZE - sizeof(struct udphdr))

static u8 pkt_data[XSK_UMEM__DEFAULT_FRAME_SIZE];

static void gen_eth_hdr_data(void)
{
struct udphdr *udp_hdr = (struct udphdr *)(pkt_data +
sizeof(struct ethhdr) +
sizeof(struct iphdr));
struct iphdr *ip_hdr = (struct iphdr *)(pkt_data +
sizeof(struct ethhdr));
struct ethhdr *eth_hdr = (struct ethhdr *)pkt_data;

/* ethernet header */
memcpy(eth_hdr->h_dest, "\x3c\xfd\xfe\x9e\x7f\x71", ETH_ALEN);
memcpy(eth_hdr->h_source, "\xec\xb1\xd7\x98\x3a\xc0", ETH_ALEN);
eth_hdr->h_proto = htons(ETH_P_IP);
struct udphdr *udp_hdr;
struct iphdr *ip_hdr;

if (opt_vlan_tag) {
struct vlan_ethhdr *veth_hdr = (struct vlan_ethhdr *)pkt_data;
u16 vlan_tci = 0;

udp_hdr = (struct udphdr *)(pkt_data +
sizeof(struct vlan_ethhdr) +
sizeof(struct iphdr));
ip_hdr = (struct iphdr *)(pkt_data +
sizeof(struct vlan_ethhdr));

/* ethernet & VLAN header */
memcpy(veth_hdr->h_dest, "\x3c\xfd\xfe\x9e\x7f\x71", ETH_ALEN);
memcpy(veth_hdr->h_source, "\xec\xb1\xd7\x98\x3a\xc0", ETH_ALEN);
veth_hdr->h_vlan_proto = htons(ETH_P_8021Q);
vlan_tci = opt_pkt_vlan_id & VLAN_VID_MASK;
vlan_tci |= (opt_pkt_vlan_pri << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
veth_hdr->h_vlan_TCI = htons(vlan_tci);
veth_hdr->h_vlan_encapsulated_proto = htons(ETH_P_IP);
} else {
struct ethhdr *eth_hdr = (struct ethhdr *)pkt_data;

udp_hdr = (struct udphdr *)(pkt_data +
sizeof(struct ethhdr) +
sizeof(struct iphdr));
ip_hdr = (struct iphdr *)(pkt_data +
sizeof(struct ethhdr));

/* ethernet header */
memcpy(eth_hdr->h_dest, "\x3c\xfd\xfe\x9e\x7f\x71", ETH_ALEN);
memcpy(eth_hdr->h_source, "\xec\xb1\xd7\x98\x3a\xc0", ETH_ALEN);
eth_hdr->h_proto = htons(ETH_P_IP);
}


/* IP header */
ip_hdr->version = IPVERSION;
Expand Down Expand Up @@ -920,6 +964,9 @@ static struct option long_options[] = {
{"tx-pkt-count", required_argument, 0, 'C'},
{"tx-pkt-size", required_argument, 0, 's'},
{"tx-pkt-pattern", required_argument, 0, 'P'},
{"tx-vlan", no_argument, 0, 'V'},
{"tx-vlan-id", required_argument, 0, 'J'},
{"tx-vlan-pri", required_argument, 0, 'K'},
{"extra-stats", no_argument, 0, 'x'},
{"quiet", no_argument, 0, 'Q'},
{"app-stats", no_argument, 0, 'a'},
Expand Down Expand Up @@ -960,6 +1007,9 @@ static void usage(const char *prog)
" (Default: %d bytes)\n"
" Min size: %d, Max size %d.\n"
" -P, --tx-pkt-pattern=nPacket fill pattern. Default: 0x%x\n"
" -V, --tx-vlan Send VLAN tagged packets (For -t|--txonly)\n"
" -J, --tx-vlan-id=n Tx VLAN ID [1-4095]. Default: %d (For -V|--tx-vlan)\n"
" -K, --tx-vlan-pri=n Tx VLAN Priority [0-7]. Default: %d (For -V|--tx-vlan)\n"
" -x, --extra-stats Display extra statistics.\n"
" -Q, --quiet Do not display any stats.\n"
" -a, --app-stats Display application (syscall) statistics.\n"
Expand All @@ -969,7 +1019,8 @@ static void usage(const char *prog)
"\n";
fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE,
opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE,
XSK_UMEM__DEFAULT_FRAME_SIZE, opt_pkt_fill_pattern);
XSK_UMEM__DEFAULT_FRAME_SIZE, opt_pkt_fill_pattern,
VLAN_VID__DEFAULT, VLAN_PRI__DEFAULT);

exit(EXIT_FAILURE);
}
Expand All @@ -981,7 +1032,7 @@ static void parse_command_line(int argc, char **argv)
opterr = 0;

for (;;) {
c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:BR",
c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:VJ:K:xQaI:BR",
long_options, &option_index);
if (c == -1)
break;
Expand Down Expand Up @@ -1062,6 +1113,15 @@ static void parse_command_line(int argc, char **argv)
case 'P':
opt_pkt_fill_pattern = strtol(optarg, NULL, 16);
break;
case 'V':
opt_vlan_tag = true;
break;
case 'J':
opt_pkt_vlan_id = atoi(optarg);
break;
case 'K':
opt_pkt_vlan_pri = atoi(optarg);
break;
case 'x':
opt_extra_stats = 1;
break;
Expand Down

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