net: shrink struct sock and request_sock by 8 bytes

One 32bit hole is following skc_refcnt, use it.
skc_incoming_cpu can also be an union for request_sock rcv_wnd.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index 6b818b7..2e73748 100644 (file)
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -51,15 +51,14 @@ struct request_sock {
 #define rsk_refcnt                     __req_common.skc_refcnt
 #define rsk_hash                       __req_common.skc_hash
 #define rsk_listener                   __req_common.skc_listener
+#define rsk_window_clamp               __req_common.skc_window_clamp
+#define rsk_rcv_wnd                    __req_common.skc_rcv_wnd
 
        struct request_sock             *dl_next;
        u16                             mss;
        u8                              num_retrans; /* number of retransmits */
        u8                              cookie_ts:1; /* syncookie: encode tcpopts in timestamp */
        u8                              num_timeout:7; /* number of timeouts */
-       /* The following two fields can be easily recomputed I think -AK */
-       u32                             window_clamp; /* window clamp at creation time */
-       u32                             rcv_wnd;          /* rcv_wnd offered first time */
        u32                             ts_recent;
        struct timer_list               rsk_timer;
        const struct request_sock_ops   *rsk_ops;

diff --git a/include/net/sock.h b/include/net/sock.h
index 6571240..19cfe1f 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -226,11 +226,18 @@ struct sock_common {
                struct hlist_nulls_node skc_nulls_node;
        };
        int                     skc_tx_queue_mapping;
-       int                     skc_incoming_cpu;
+       union {
+               int             skc_incoming_cpu;
+               u32             skc_rcv_wnd;
+       };
 
        atomic_t                skc_refcnt;
        /* private: */
        int                     skc_dontcopy_end[0];
+       union {
+               u32             skc_rxhash;
+               u32             skc_window_clamp;
+       };
        /* public: */
 };
 
@@ -287,7 +294,6 @@ struct cg_proto;
   *    @sk_rcvlowat: %SO_RCVLOWAT setting
   *    @sk_rcvtimeo: %SO_RCVTIMEO setting
   *    @sk_sndtimeo: %SO_SNDTIMEO setting
-  *    @sk_rxhash: flow hash received from netif layer
   *    @sk_txhash: computed flow hash for use on transmit
   *    @sk_filter: socket filtering instructions
   *    @sk_timer: sock cleanup timer
@@ -346,6 +352,7 @@ struct sock {
 #define sk_cookie              __sk_common.skc_cookie
 #define sk_incoming_cpu                __sk_common.skc_incoming_cpu
 #define sk_flags               __sk_common.skc_flags
+#define sk_rxhash              __sk_common.skc_rxhash
 
        socket_lock_t           sk_lock;
        struct sk_buff_head     sk_receive_queue;
@@ -365,9 +372,6 @@ struct sock {
        } sk_backlog;
 #define sk_rmem_alloc sk_backlog.rmem_alloc
        int                     sk_forward_alloc;
-#ifdef CONFIG_RPS
-       __u32                   sk_rxhash;
-#endif
 
        __u32                   sk_txhash;
 #ifdef CONFIG_NET_RX_BUSY_POLL

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 2dbb113..4c0892b 100644 (file)
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -382,10 +382,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
        }
 
        /* Try to redo what tcp_v4_send_synack did. */
-       req->window_clamp = tp->window_clamp ? :dst_metric(&rt->dst, RTAX_WINDOW);
+       req->rsk_window_clamp = tp->window_clamp ? :dst_metric(&rt->dst, RTAX_WINDOW);
 
        tcp_select_initial_window(tcp_full_space(sk), req->mss,
-                                 &req->rcv_wnd, &req->window_clamp,
+                                 &req->rsk_rcv_wnd, &req->rsk_window_clamp,
                                  ireq->wscale_ok, &rcv_wscale,
                                  dst_metric(&rt->dst, RTAX_INITRWND));
 

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ddadb31..3b35c3f 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6022,7 +6022,7 @@ static void tcp_openreq_init(struct request_sock *req,
 {
        struct inet_request_sock *ireq = inet_rsk(req);
 
-       req->rcv_wnd = 0;               /* So that tcp_send_synack() knows! */
+       req->rsk_rcv_wnd = 0;           /* So that tcp_send_synack() knows! */
        req->cookie_ts = 0;
        tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
        tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3431074..ddb1983 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -803,7 +803,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
         */
        tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ?
                        tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
-                       tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
+                       tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd,
                        tcp_time_stamp,
                        req->ts_recent,
                        0,

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 1079e6a..41828bd 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -381,18 +381,18 @@ void tcp_openreq_init_rwin(struct request_sock *req,
 
        window_clamp = READ_ONCE(tp->window_clamp);
        /* Set this up on the first call only */
-       req->window_clamp = window_clamp ? : dst_metric(dst, RTAX_WINDOW);
+       req->rsk_window_clamp = window_clamp ? : dst_metric(dst, RTAX_WINDOW);
 
        /* limit the window selection if the user enforce a smaller rx buffer */
        if (sk_listener->sk_userlocks & SOCK_RCVBUF_LOCK &&
-           (req->window_clamp > full_space || req->window_clamp == 0))
-               req->window_clamp = full_space;
+           (req->rsk_window_clamp > full_space || req->rsk_window_clamp == 0))
+               req->rsk_window_clamp = full_space;
 
        /* tcp_full_space because it is guaranteed to be the first packet */
        tcp_select_initial_window(full_space,
                mss - (ireq->tstamp_ok ? TCPOLEN_TSTAMP_ALIGNED : 0),
-               &req->rcv_wnd,
-               &req->window_clamp,
+               &req->rsk_rcv_wnd,
+               &req->rsk_window_clamp,
                ireq->wscale_ok,
                &rcv_wscale,
                dst_metric(dst, RTAX_INITRWND));
@@ -512,9 +512,9 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
                        if (sysctl_tcp_fack)
                                tcp_enable_fack(newtp);
                }
-               newtp->window_clamp = req->window_clamp;
-               newtp->rcv_ssthresh = req->rcv_wnd;
-               newtp->rcv_wnd = req->rcv_wnd;
+               newtp->window_clamp = req->rsk_window_clamp;
+               newtp->rcv_ssthresh = req->rsk_rcv_wnd;
+               newtp->rcv_wnd = req->rsk_rcv_wnd;
                newtp->rx_opt.wscale_ok = ireq->wscale_ok;
                if (newtp->rx_opt.wscale_ok) {
                        newtp->rx_opt.snd_wscale = ireq->snd_wscale;
@@ -707,7 +707,7 @@ 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,
-                                         tcp_rsk(req)->rcv_nxt, tcp_rsk(req)->rcv_nxt + req->rcv_wnd)) {
+                                         tcp_rsk(req)->rcv_nxt, tcp_rsk(req)->rcv_nxt + req->rsk_rcv_wnd)) {
                /* Out of window: send ACK and drop. */
                if (!(flg & TCP_FLAG_RST))
                        req->rsk_ops->send_ack(sk, skb, req);

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 55ed326..6e79fcb 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3023,7 +3023,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
        th->ack_seq = htonl(tcp_rsk(req)->rcv_nxt);
 
        /* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */
-       th->window = htons(min(req->rcv_wnd, 65535U));
+       th->window = htons(min(req->rsk_rcv_wnd, 65535U));
        tcp_options_write((__be32 *)(th + 1), NULL, &opts);
        th->doff = (tcp_header_size >> 2);
        TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_OUTSEGS);

diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index f610b53..bb8f2fa 100644 (file)
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -235,9 +235,9 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
                        goto out_free;
        }
 
-       req->window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
+       req->rsk_window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
        tcp_select_initial_window(tcp_full_space(sk), req->mss,
-                                 &req->rcv_wnd, &req->window_clamp,
+                                 &req->rsk_rcv_wnd, &req->rsk_window_clamp,
                                  ireq->wscale_ok, &rcv_wscale,
                                  dst_metric(dst, RTAX_INITRWND));
 

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 33334f0..2887c84 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -931,7 +931,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
         */
        tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
                        tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
-                       tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
+                       tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd,
                        tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if,
                        tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
                        0, 0);