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38b50dba47
Avoid a bunch of syscalls on forwarding paths by: - storing minimum and maximum file descriptor numbers for each protocol, fall back to SO_PROTOCOL query only on overlaps - allocating a larger receive buffer -- this can result in more coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024), so make sure we don't exceed that within a single call to protocol tap handlers - nesting the handling loop in tap_handler() in the receive loop, so that we have better chances of filling our receive buffer in fewer calls - skipping the recvfrom() in the UDP handler on EPOLLERR -- there's nothing to be done in that case and while at it: - restore the 20ms timer interval for periodic (TCP) events, I accidentally changed that to 100ms in an earlier commit - attempt using SO_ZEROCOPY for UDP -- if it's not available, sendmmsg() will succeed anyway - fix the handling of the status code from sendmmsg(), if it fails, we'll try to discard the first message, hence return 1 from the UDP handler Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
20 lines
463 B
C
20 lines
463 B
C
#ifndef UDP_H
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#define UDP_H
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void udp_sock_handler(struct ctx *c, int s, uint32_t events);
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int udp_tap_handler(struct ctx *c, int af, void *addr,
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struct tap_msg *msg, int count);
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int udp_sock_init(struct ctx *c);
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/**
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* struct udp_ctx - Execution context for UDP
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* @fd_min: Lowest file descriptor number for UDP ever used
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* @fd_max: Highest file descriptor number for UDP ever used
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*/
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struct udp_ctx {
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int fd_min;
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int fd_max;
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};
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#endif /* UDP_H */
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