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This small change adopts the excellent suggestion for using named

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structures in the add of a new tcp-stack that came in late to me
via email after the last commit. It also makes it so that a new
stack may optionally get a callback during a retransmit
timeout. This allows the new stack to clear specific state (think
sack scoreboards or other such structures).

Sponsored by:	Netflix Inc.
Differential Revision:	http://reviews.freebsd.org/D6303
This commit is contained in:
Randall Stewart 2016-05-17 09:53:22 +00:00
parent 71edebc7d5
commit 5105a92c49
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=300042
3 changed files with 13 additions and 25 deletions
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33
sys/netinet/tcp_stacks/fastpath.c
View File

@ -2375,34 +2375,17 @@ tcp_do_segment_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
}
struct tcp_function_block __tcp_fastslow = {
"fastslow",
tcp_output,
tcp_do_segment_fastslow,
tcp_default_ctloutput,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0
.tfb_tcp_block_name = "fastslow",
.tfb_tcp_output = tcp_output,
.tfb_tcp_do_segment = tcp_do_segment_fastslow,
.tfb_tcp_ctloutput = tcp_default_ctloutput,
};
struct tcp_function_block __tcp_fastack = {
"fastack",
tcp_output,
tcp_do_segment_fastack,
tcp_default_ctloutput,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0
.tfb_tcp_block_name = "fastack",
.tfb_tcp_output = tcp_output,
.tfb_tcp_do_segment = tcp_do_segment_fastack,
.tfb_tcp_ctloutput = tcp_default_ctloutput
};
static int

4
sys/netinet/tcp_timer.c
View File

@ -604,6 +604,10 @@ tcp_timer_rexmt(void * xtp)
KASSERT((tp->t_timers->tt_flags & TT_REXMT) != 0,
("%s: tp %p rexmt callout should be running", __func__, tp));
tcp_free_sackholes(tp);
if (tp->t_fb->tfb_tcp_rexmit_tmr) {
/* The stack has a timer action too. */
(*tp->t_fb->tfb_tcp_rexmit_tmr)(tp);
}
/*
* Retransmission timer went off. Message has not
* been acked within retransmit interval. Back off

1
sys/netinet/tcp_var.h
View File

@ -135,6 +135,7 @@ struct tcp_function_block {
uint32_t, u_int);
int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
volatile uint32_t tfb_refcnt;
uint32_t tfb_flags;
};