net: only read from tapfd when we can send
Reduce the number of packets dropped under heavy network traffic by only reading a packet from the tapfd when a client can actually handle it. Signed-off-by: Mark McLoughlin <markmc@redhat.com>
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parent
2e1e064110
commit
3471b757d0
9
net.c
9
net.c
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@ -956,6 +956,13 @@ static void tap_receive(void *opaque, const uint8_t *buf, int size)
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}
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}
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}
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}
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static int tap_can_send(void *opaque)
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{
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TAPState *s = opaque;
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return qemu_can_send_packet(s->vc);
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}
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#ifdef __sun__
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#ifdef __sun__
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static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
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static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
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{
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{
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@ -1011,7 +1018,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan,
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s->vc = qemu_new_vlan_client(vlan, model, name, tap_receive,
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s->vc = qemu_new_vlan_client(vlan, model, name, tap_receive,
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NULL, tap_cleanup, s);
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NULL, tap_cleanup, s);
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s->vc->fd_readv = tap_receive_iov;
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s->vc->fd_readv = tap_receive_iov;
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qemu_set_fd_handler(s->fd, tap_send, NULL, s);
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qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
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snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
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snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
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return s;
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return s;
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}
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}
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