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authorJakub Grajciar <jgrajcia@cisco.com>2018-03-29 13:15:10 +0200
committerDamjan Marion <dmarion.lists@gmail.com>2018-03-30 20:48:36 +0000
commit3744fc7abce0cf8694d64b670589e35c6d7bf881 (patch)
tree04f5f42458a1ab4f3f4109f890e998221b22e622 /extras/libmemif/examples/icmp_responder
parent17ddc0fee1bc20d0da84dd70bb579c8844a48ef4 (diff)
libmemif: zero-copy-slave mode + header space
Slave is now able to dequeue buffers from rx queue and enqueue them to tx queue (zero-copy operation). Slave can produce buffers with headroom, which will allow adding encap without copy. Change-Id: Ia189f8de1a68be787545ed46cf78d36403e7e9bf Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Diffstat (limited to 'extras/libmemif/examples/icmp_responder')
-rw-r--r--extras/libmemif/examples/icmp_responder/icmp_proto.c186
-rw-r--r--extras/libmemif/examples/icmp_responder/icmp_proto.h16
-rw-r--r--extras/libmemif/examples/icmp_responder/main.c15
3 files changed, 210 insertions, 7 deletions
diff --git a/extras/libmemif/examples/icmp_responder/icmp_proto.c b/extras/libmemif/examples/icmp_responder/icmp_proto.c
index b27abb6a231..e1d255aca27 100644
--- a/extras/libmemif/examples/icmp_responder/icmp_proto.c
+++ b/extras/libmemif/examples/icmp_responder/icmp_proto.c
@@ -37,6 +37,7 @@
#include <net/if_arp.h>
#include <asm/byteorder.h>
#include <byteswap.h>
+#include <assert.h>
#include <icmp_proto.h>
@@ -337,3 +338,188 @@ generate_packet (void *pck, uint32_t * size, uint8_t saddr[4],
return 0;
}
+
+int
+generate_packet2 (void *pck, uint32_t * size, uint8_t saddr[4],
+ uint8_t daddr[4], uint8_t hw_daddr[6], uint32_t seq,
+ icmpr_flow_mode_t mode)
+{
+ struct ether_header *eh;
+ struct iphdr *ip;
+ struct icmphdr *icmp;
+
+ *size = 0;
+
+ if (mode == ICMPR_FLOW_MODE_ETH)
+ {
+ eh = (struct ether_header *) pck;
+ *size += generate_eth (eh, hw_daddr);
+ }
+
+ ip = (struct iphdr *) (pck + *size);
+ *size += generate_ip (ip, saddr, daddr);
+
+ icmp = (struct icmphdr *) (pck + *size);
+ *size += generate_icmp (icmp, seq);
+
+ ((struct icmphdr *) (pck + *size - sizeof (struct icmphdr)))->checksum =
+ cksum (pck + *size - sizeof (struct icmphdr), sizeof (struct icmphdr));
+
+ ip->tot_len = __bswap_16 (*size - sizeof (struct ether_header));
+ ip->check = 0;
+ ip->check = cksum (ip, sizeof (struct iphdr));
+
+ return 0;
+}
+
+#define GET_HEADER(out,hdr,src,off) do { \
+ out = (hdr*)(src + off); \
+ off += sizeof (hdr); \
+ } while (0)
+
+int
+resolve_packet2 (void *pck, uint32_t * size, uint8_t ip_addr[4])
+{
+ struct ether_header *eh;
+ struct ether_arp *eah;
+ struct iphdr *ip;
+ struct icmphdr *icmp;
+ uint32_t offset = 0;
+
+ if (pck == NULL)
+ return 0;
+
+ GET_HEADER (eh, struct ether_header, pck, offset);
+
+ memcpy (eh->ether_dhost, eh->ether_shost, 6);
+ memcpy (eh->ether_shost, "aaaaaa", 6);
+
+ if (eh->ether_type == 0x0608)
+ {
+ GET_HEADER (eah, struct ether_arp, pck, offset);
+ struct arphdr *arp = &eah->ea_hdr;
+
+ arp->ar_hrd = __bswap_16 (ARPHRD_ETHER);
+ arp->ar_pro = __bswap_16 (0x0800);
+
+ arp->ar_hln = 6;
+ arp->ar_pln = 4;
+
+ arp->ar_op = __bswap_16 (ARPOP_REPLY);
+
+ memcpy (eah->arp_tha, eah->arp_sha, 6);
+ memcpy (eah->arp_tpa, eah->arp_spa, 4);
+
+ memcpy (eah->arp_sha, eh->ether_shost, 6);
+ memcpy (eah->arp_spa, ip_addr, 4);
+ }
+
+ else if (eh->ether_type == 0x0008)
+ {
+ GET_HEADER (ip, struct iphdr, pck, offset);
+
+ if (ip->protocol == 1)
+ {
+ ip->ihl = 5;
+ ip->version = 4;
+ ip->tos = 0;
+ ip->tot_len = 0x0000;
+ ip->id = 0;
+ ip->frag_off = 0;
+ ip->ttl = 0x40;
+ ip->protocol = 1;
+ ip->check = 0x0000;
+ ip->daddr = ip->saddr;
+ ((uint8_t *) & ip->saddr)[0] = ip_addr[0];
+ ((uint8_t *) & ip->saddr)[1] = ip_addr[1];
+ ((uint8_t *) & ip->saddr)[2] = ip_addr[2];
+ ((uint8_t *) & ip->saddr)[3] = ip_addr[3];
+
+ GET_HEADER (icmp, struct icmphdr, pck, offset);
+
+ icmp->type = 0x00;
+ icmp->code = 0;
+ icmp->checksum = cksum (icmp, sizeof (struct icmphdr));
+
+ /* rest is payload */
+ offset = *size;
+
+ ip->tot_len = __bswap_16 (offset - sizeof (struct ether_header));
+ ip->check = cksum (ip, sizeof (struct iphdr));
+ }
+ }
+
+ assert (offset == *size && "unsupported protocol");
+ return 0;
+}
+
+
+int
+resolve_packet3 (void **pck_, uint32_t * size, uint8_t ip_addr[4])
+{
+ struct ether_header *eh;
+ struct ether_arp *eah;
+ struct iphdr *ip;
+ struct icmphdr *icmp;
+ int32_t offset = 0;
+ uint16_t encap_size = sizeof (struct ether_header);
+ void *pck = *pck_;
+
+ if (pck == NULL)
+ return 0;
+
+ *pck_ -= encap_size;
+ offset -= encap_size;
+
+ GET_HEADER (eh, struct ether_header, pck, offset);
+
+ uint8_t hw_daddr[6];
+ memset (hw_daddr, 0, sizeof (uint8_t) * 6);
+
+ generate_eth (eh, hw_daddr);
+
+ if (eh->ether_type == 0x0008)
+ {
+ GET_HEADER (ip, struct iphdr, pck, offset);
+
+ if (ip->protocol == 1)
+ {
+ ip->ihl = 5;
+ ip->version = 4;
+ ip->tos = 0;
+ ip->tot_len = 0x0000;
+ ip->id = 0;
+ ip->frag_off = 0;
+ ip->ttl = 0x40;
+ ip->protocol = 1;
+ ip->check = 0x0000;
+ ip->daddr = ip->saddr;
+ ((uint8_t *) & ip->saddr)[0] = ip_addr[0];
+ ((uint8_t *) & ip->saddr)[1] = ip_addr[1];
+ ((uint8_t *) & ip->saddr)[2] = ip_addr[2];
+ ((uint8_t *) & ip->saddr)[3] = ip_addr[3];
+
+ GET_HEADER (icmp, struct icmphdr, pck, offset);
+
+ icmp->type = 0x00;
+ icmp->code = 0;
+ icmp->checksum = cksum (icmp, sizeof (struct icmphdr));
+
+ /* rest is payload */
+ offset = *size;
+
+ ip->tot_len = __bswap_16 (offset - sizeof (struct ether_header));
+ ip->check = cksum (ip, sizeof (struct iphdr));
+ }
+ }
+
+ offset += encap_size;
+
+ assert (offset != *size &&
+ "new packet length must be increased by encap size");
+
+ /* overwrite packet size */
+ *size = offset;
+
+ return 0;
+}
diff --git a/extras/libmemif/examples/icmp_responder/icmp_proto.h b/extras/libmemif/examples/icmp_responder/icmp_proto.h
index ca72b2fe026..1575719bd6a 100644
--- a/extras/libmemif/examples/icmp_responder/icmp_proto.h
+++ b/extras/libmemif/examples/icmp_responder/icmp_proto.h
@@ -18,12 +18,28 @@
#ifndef _ICMP_PROTO_H_
#define _ICMP_PROTO_H_
+typedef enum
+{
+ ICMPR_FLOW_MODE_ETH = 0,
+ ICMPR_FLOW_MODE_IP,
+} icmpr_flow_mode_t;
+
int resolve_packet (void *in_pck, ssize_t in_size, void *out_pck,
uint32_t * out_size, uint8_t ip_addr[4]);
+/* resolve packet in place */
+int resolve_packet2 (void *pck, uint32_t * size, uint8_t ip_addr[4]);
+
+/* resolve packet in place and add eth encap */
+int resolve_packet3 (void **pck, uint32_t * size, uint8_t ip_addr[4]);
+
int generate_packet (void *pck, uint32_t * size, uint8_t saddr[4],
uint8_t daddr[4], uint8_t hw_daddr[6], uint32_t seq);
+int generate_packet2 (void *pck, uint32_t * size, uint8_t saddr[4],
+ uint8_t daddr[4], uint8_t hw_daddr[6], uint32_t seq,
+ icmpr_flow_mode_t);
+
int print_packet (void *pck);
#endif /* _ICMP_PROTO_H_ */
diff --git a/extras/libmemif/examples/icmp_responder/main.c b/extras/libmemif/examples/icmp_responder/main.c
index b820ad3b12d..5e78acd3537 100644
--- a/extras/libmemif/examples/icmp_responder/main.c
+++ b/extras/libmemif/examples/icmp_responder/main.c
@@ -225,7 +225,7 @@ icmpr_buffer_alloc (long n, uint16_t qid)
int err;
uint16_t r;
/* set data pointer to shared memory and set buffer_len to shared mmeory buffer len */
- err = memif_buffer_alloc (c->conn, qid, c->tx_bufs, n, &r, 128);
+ err = memif_buffer_alloc (c->conn, qid, c->tx_bufs, n, &r, 0);
if (err != MEMIF_ERR_SUCCESS)
{
INFO ("memif_buffer_alloc: %s", memif_strerror (err));
@@ -311,24 +311,25 @@ on_interrupt (memif_conn_handle_t conn, void *private_ctx, uint16_t qid)
&(c->tx_bufs + i)->len, c->ip_addr);
}
+ uint16_t fb;
/* mark memif buffers and shared memory buffers as free */
- err = memif_refill_queue (c->conn, qid, rx);
- c->rx_buf_num -= rx;
+ err = memif_refill_queue (c->conn, qid, rx, 0);
+ c->rx_buf_num -= fb;
DBG ("freed %d buffers. %u/%u alloc/free buffers",
- rx, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
+ fb, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
icmpr_tx_burst (c->tx_qid);
return 0;
error:
- err = memif_refill_queue (c->conn, qid, rx);
+ err = memif_refill_queue (c->conn, qid, rx, 0);
if (err != MEMIF_ERR_SUCCESS)
INFO ("memif_buffer_free: %s", memif_strerror (err));
- c->rx_buf_num -= rx;
+ c->rx_buf_num -= fb;
DBG ("freed %d buffers. %u/%u alloc/free buffers",
- rx, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
+ fb, c->rx_buf_num, MAX_MEMIF_BUFS - c->rx_buf_num);
return 0;
}