[CCID3]: Use a function to update p_inv, and p is never used

This patch
 1) concentrates previously scattered computation of p_inv into one function;
 2) removes the `p' element of the CCID3 RX sock (it is redundant);
 3) makes the tfrc_rx_info structure standalone, only used on demand.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index cd9b9ffe2ec4aae74d3f1f065eb304157dc305e2..e31560daa0b94653404b7788468936975da43411 100644 (file)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -917,6 +917,7 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
                                  u32 __user *optval, int __user *optlen)
 {
        const struct ccid3_hc_rx_sock *hcrx;
+       struct tfrc_rx_info rx_info;
        const void *val;
 
        /* Listen socks doesn't have a private CCID block */
@@ -926,10 +927,14 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
        hcrx = ccid3_hc_rx_sk(sk);
        switch (optname) {
        case DCCP_SOCKOPT_CCID_RX_INFO:
-               if (len < sizeof(hcrx->ccid3hcrx_tfrc))
+               if (len < sizeof(rx_info))
                        return -EINVAL;
-               len = sizeof(hcrx->ccid3hcrx_tfrc);
-               val = &hcrx->ccid3hcrx_tfrc;
+               rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv;
+               rx_info.tfrcrx_rtt    = hcrx->ccid3hcrx_rtt;
+               rx_info.tfrcrx_p      = hcrx->ccid3hcrx_pinv == 0 ? ~0U :
+                                          scaled_div(1, hcrx->ccid3hcrx_pinv);
+               len = sizeof(rx_info);
+               val = &rx_info;
                break;
        default:
                return -ENOPROTOOPT;

diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index e9f6ff4f0552432b5fd675e7fd10fc331dee5502..49ca32bd7e79d608592aaae0371545ff246ab013 100644 (file)
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -139,6 +139,8 @@ enum ccid3_hc_rx_states {
  *  @ccid3hcrx_last_counter  -  Tracks window counter (RFC 4342, 8.1)
  *  @ccid3hcrx_state  -  Receiver state, one of %ccid3_hc_rx_states
  *  @ccid3hcrx_bytes_recv  -  Total sum of DCCP payload bytes
+ *  @ccid3hcrx_x_recv  -  Receiver estimate of send rate (RFC 3448, sec. 4.3)
+ *  @ccid3hcrx_rtt  -  Receiver estimate of RTT
  *  @ccid3hcrx_tstamp_last_feedback  -  Time at which last feedback was sent
  *  @ccid3hcrx_tstamp_last_ack  -  Time at which last feedback was sent
  *  @ccid3hcrx_hist  -  Packet history (loss detection + RTT sampling)
@@ -147,13 +149,11 @@ enum ccid3_hc_rx_states {
  *  @ccid3hcrx_pinv  -  Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
  */
 struct ccid3_hc_rx_sock {
-       struct tfrc_rx_info             ccid3hcrx_tfrc;
-#define ccid3hcrx_x_recv               ccid3hcrx_tfrc.tfrcrx_x_recv
-#define ccid3hcrx_rtt                  ccid3hcrx_tfrc.tfrcrx_rtt
-#define ccid3hcrx_p                    ccid3hcrx_tfrc.tfrcrx_p
        u8                              ccid3hcrx_last_counter:4;
        enum ccid3_hc_rx_states         ccid3hcrx_state:8;
        u32                             ccid3hcrx_bytes_recv;
+       u32                             ccid3hcrx_x_recv;
+       u32                             ccid3hcrx_rtt;
        ktime_t                         ccid3hcrx_tstamp_last_feedback;
        struct tfrc_rx_hist             ccid3hcrx_hist;
        struct tfrc_loss_hist           ccid3hcrx_li_hist;