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udp: Introduce recvmmsg()/sendmmsg(), zero-copy path from socket

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Packets are received directly onto pre-cooked, static buffers
for IPv4 (with partial checksum pre-calculation) and IPv6 frames,
with pre-filled Ethernet addresses and, partially, IP headers,
and sent out from the same buffers with sendmmsg(), for both
passt and pasta (non-local traffic only) modes.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-07-21 12:01:04 +02:00
parent 7fa3e90290
commit 64a0ba3b27
9 changed files with 537 additions and 61 deletions

59
util.h
View file

@ -52,6 +52,64 @@ void debug(const char *format, ...);
#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 4)
#if __BYTE_ORDER == __BIG_ENDIAN
#define L2_BUF_ETH_IP4_INIT \
{ \
.h_dest = { 0 }, \
.h_source = { 0 }, \
.h_proto = ETH_P_IP, \
}
#else
#define L2_BUF_ETH_IP4_INIT \
{ \
.h_dest = { 0 }, \
.h_source = { 0 }, \
.h_proto = __bswap_constant_16(ETH_P_IP), \
}
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
#define L2_BUF_ETH_IP6_INIT \
{ \
.h_dest = { 0 }, \
.h_source = { 0 }, \
.h_proto = ETH_P_IPV6, \
}
#else
#define L2_BUF_ETH_IP6_INIT \
{ \
.h_dest = { 0 }, \
.h_source = { 0 }, \
.h_proto = __bswap_constant_16(ETH_P_IPV6), \
}
#endif
#define L2_BUF_IP4_INIT(proto) \
{ \
.version = 4, \
.ihl = 5, \
.tos = 0, \
.tot_len = 0, \
.id = 0, \
.frag_off = 0, \
.ttl = 255, \
.protocol = (proto), \
.saddr = 0, \
.daddr = 0, \
}
#define L2_BUF_IP6_INIT(proto) \
{ \
.priority = 0, \
.version = 6, \
.flow_lbl = { 0 }, \
.payload_len = 0, \
.nexthdr = (proto), \
.hop_limit = 255, \
.saddr = IN6ADDR_ANY_INIT, \
.daddr = IN6ADDR_ANY_INIT, \
}
#include <linux/ipv6.h>
#include <net/if.h>
#include <linux/ip.h>
@ -59,6 +117,7 @@ void debug(const char *format, ...);
struct ctx;
uint32_t sum_16b(void *buf, size_t len);
uint16_t csum_fold(uint32_t sum);
uint16_t csum_ip4(void *buf, size_t len);
void csum_tcp4(struct iphdr *iph);