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[NET] Generalise TCP's struct open_request minisock infrastructure

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Kept this first changeset minimal, without changing existing names to
ease peer review.

Basicaly tcp_openreq_alloc now receives the or_calltable, that in turn
has two new members:

->slab, that replaces tcp_openreq_cachep
->obj_size, to inform the size of the openreq descendant for
  a specific protocol

The protocol specific fields in struct open_request were moved to a
class hierarchy, with the things that are common to all connection
oriented PF_INET protocols in struct inet_request_sock, the TCP ones
in tcp_request_sock, that is an inet_request_sock, that is an
open_request.

I.e. this uses the same approach used for the struct sock class
hierarchy, with sk_prot indicating if the protocol wants to use the
open_request infrastructure by filling in sk_prot->rsk_prot with an
or_calltable.

Results? Performance is improved and TCP v4 now uses only 64 bytes per
open request minisock, down from 96 without this patch :-)

Next changeset will rename some of the structs, fields and functions
mentioned above, struct or_calltable is way unclear, better name it
struct request_sock_ops, s/struct open_request/struct request_sock/g,
etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-06-18 22:46:52 -07:00
committed by David S. Miller
parent 1944972d3b
commit 2e6599cb89
16 changed files with 341 additions and 230 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
net/ipv4/tcp_minisocks.c
View File

@@ -692,6 +692,8 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct open_request *req,
struct sock *newsk = sk_alloc(PF_INET, GFP_ATOMIC, sk->sk_prot, 0);
if(newsk != NULL) {
struct inet_request_sock *ireq = inet_rsk(req);
struct tcp_request_sock *treq = tcp_rsk(req);
struct tcp_sock *newtp;
struct sk_filter *filter;
@@ -703,7 +705,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct open_request *req,
tcp_sk(newsk)->bind_hash = NULL;
/* Clone the TCP header template */
inet_sk(newsk)->dport = req->rmt_port;
inet_sk(newsk)->dport = ireq->rmt_port;
sock_lock_init(newsk);
bh_lock_sock(newsk);
@@ -739,14 +741,14 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct open_request *req,
/* Now setup tcp_sock */
newtp = tcp_sk(newsk);
newtp->pred_flags = 0;
newtp->rcv_nxt = req->rcv_isn + 1;
newtp->snd_nxt = req->snt_isn + 1;
newtp->snd_una = req->snt_isn + 1;
newtp->snd_sml = req->snt_isn + 1;
newtp->rcv_nxt = treq->rcv_isn + 1;
newtp->snd_nxt = treq->snt_isn + 1;
newtp->snd_una = treq->snt_isn + 1;
newtp->snd_sml = treq->snt_isn + 1;
tcp_prequeue_init(newtp);
tcp_init_wl(newtp, req->snt_isn, req->rcv_isn);
tcp_init_wl(newtp, treq->snt_isn, treq->rcv_isn);
newtp->retransmits = 0;
newtp->backoff = 0;
@@ -775,10 +777,10 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct open_request *req,
tcp_set_ca_state(newtp, TCP_CA_Open);
tcp_init_xmit_timers(newsk);
skb_queue_head_init(&newtp->out_of_order_queue);
newtp->rcv_wup = req->rcv_isn + 1;
newtp->write_seq = req->snt_isn + 1;
newtp->rcv_wup = treq->rcv_isn + 1;
newtp->write_seq = treq->snt_isn + 1;
newtp->pushed_seq = newtp->write_seq;
newtp->copied_seq = req->rcv_isn + 1;
newtp->copied_seq = treq->rcv_isn + 1;
newtp->rx_opt.saw_tstamp = 0;
@@ -808,18 +810,18 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct open_request *req,
newsk->sk_socket = NULL;
newsk->sk_sleep = NULL;
newtp->rx_opt.tstamp_ok = req->tstamp_ok;
if((newtp->rx_opt.sack_ok = req->sack_ok) != 0) {
newtp->rx_opt.tstamp_ok = ireq->tstamp_ok;
if((newtp->rx_opt.sack_ok = ireq->sack_ok) != 0) {
if (sysctl_tcp_fack)
newtp->rx_opt.sack_ok |= 2;
}
newtp->window_clamp = req->window_clamp;
newtp->rcv_ssthresh = req->rcv_wnd;
newtp->rcv_wnd = req->rcv_wnd;
newtp->rx_opt.wscale_ok = req->wscale_ok;
newtp->rx_opt.wscale_ok = ireq->wscale_ok;
if (newtp->rx_opt.wscale_ok) {
newtp->rx_opt.snd_wscale = req->snd_wscale;
newtp->rx_opt.rcv_wscale = req->rcv_wscale;
newtp->rx_opt.snd_wscale = ireq->snd_wscale;
newtp->rx_opt.rcv_wscale = ireq->rcv_wscale;
} else {
newtp->rx_opt.snd_wscale = newtp->rx_opt.rcv_wscale = 0;
newtp->window_clamp = min(newtp->window_clamp, 65535U);
@@ -881,7 +883,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
}
/* Check for pure retransmitted SYN. */
if (TCP_SKB_CB(skb)->seq == req->rcv_isn &&
if (TCP_SKB_CB(skb)->seq == tcp_rsk(req)->rcv_isn &&
flg == TCP_FLAG_SYN &&
!paws_reject) {
/*
@@ -959,7 +961,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
* Invalid ACK: reset will be sent by listening socket
*/
if ((flg & TCP_FLAG_ACK) &&
(TCP_SKB_CB(skb)->ack_seq != req->snt_isn+1))
(TCP_SKB_CB(skb)->ack_seq != tcp_rsk(req)->snt_isn + 1))
return sk;
/* Also, it would be not so bad idea to check rcv_tsecr, which
@@ -970,7 +972,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
/* RFC793: "first check sequence number". */
if (paws_reject || !tcp_in_window(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq,
req->rcv_isn+1, req->rcv_isn+1+req->rcv_wnd)) {
tcp_rsk(req)->rcv_isn + 1, tcp_rsk(req)->rcv_isn + 1 + req->rcv_wnd)) {
/* Out of window: send ACK and drop. */
if (!(flg & TCP_FLAG_RST))
req->class->send_ack(skb, req);
@@ -981,12 +983,12 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
/* In sequence, PAWS is OK. */
if (tmp_opt.saw_tstamp && !after(TCP_SKB_CB(skb)->seq, req->rcv_isn+1))
if (tmp_opt.saw_tstamp && !after(TCP_SKB_CB(skb)->seq, tcp_rsk(req)->rcv_isn + 1))
req->ts_recent = tmp_opt.rcv_tsval;
if (TCP_SKB_CB(skb)->seq == req->rcv_isn) {
if (TCP_SKB_CB(skb)->seq == tcp_rsk(req)->rcv_isn) {
/* Truncate SYN, it is out of window starting
at req->rcv_isn+1. */
at tcp_rsk(req)->rcv_isn + 1. */
flg &= ~TCP_FLAG_SYN;
}
@@ -1003,8 +1005,8 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
return NULL;
/* If TCP_DEFER_ACCEPT is set, drop bare ACK. */
if (tp->defer_accept && TCP_SKB_CB(skb)->end_seq == req->rcv_isn+1) {
req->acked = 1;
if (tp->defer_accept && TCP_SKB_CB(skb)->end_seq == tcp_rsk(req)->rcv_isn + 1) {
inet_rsk(req)->acked = 1;
return NULL;
}
@@ -1026,7 +1028,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
listen_overflow:
if (!sysctl_tcp_abort_on_overflow) {
req->acked = 1;
inet_rsk(req)->acked = 1;
return NULL;
}