[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>
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@ -917,6 +917,7 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
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u32 __user *optval, int __user *optlen)
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{
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const struct ccid3_hc_rx_sock *hcrx;
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struct tfrc_rx_info rx_info;
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const void *val;
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/* Listen socks doesn't have a private CCID block */
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@ -926,10 +927,14 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
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hcrx = ccid3_hc_rx_sk(sk);
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switch (optname) {
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case DCCP_SOCKOPT_CCID_RX_INFO:
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if (len < sizeof(hcrx->ccid3hcrx_tfrc))
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if (len < sizeof(rx_info))
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return -EINVAL;
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len = sizeof(hcrx->ccid3hcrx_tfrc);
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val = &hcrx->ccid3hcrx_tfrc;
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rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv;
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rx_info.tfrcrx_rtt = hcrx->ccid3hcrx_rtt;
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rx_info.tfrcrx_p = hcrx->ccid3hcrx_pinv == 0 ? ~0U :
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scaled_div(1, hcrx->ccid3hcrx_pinv);
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len = sizeof(rx_info);
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val = &rx_info;
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break;
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default:
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return -ENOPROTOOPT;
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@ -139,6 +139,8 @@ enum ccid3_hc_rx_states {
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* @ccid3hcrx_last_counter - Tracks window counter (RFC 4342, 8.1)
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* @ccid3hcrx_state - Receiver state, one of %ccid3_hc_rx_states
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* @ccid3hcrx_bytes_recv - Total sum of DCCP payload bytes
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* @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448, sec. 4.3)
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* @ccid3hcrx_rtt - Receiver estimate of RTT
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* @ccid3hcrx_tstamp_last_feedback - Time at which last feedback was sent
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* @ccid3hcrx_tstamp_last_ack - Time at which last feedback was sent
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* @ccid3hcrx_hist - Packet history (loss detection + RTT sampling)
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@ -147,13 +149,11 @@ enum ccid3_hc_rx_states {
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* @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
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*/
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struct ccid3_hc_rx_sock {
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struct tfrc_rx_info ccid3hcrx_tfrc;
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#define ccid3hcrx_x_recv ccid3hcrx_tfrc.tfrcrx_x_recv
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#define ccid3hcrx_rtt ccid3hcrx_tfrc.tfrcrx_rtt
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#define ccid3hcrx_p ccid3hcrx_tfrc.tfrcrx_p
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u8 ccid3hcrx_last_counter:4;
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enum ccid3_hc_rx_states ccid3hcrx_state:8;
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u32 ccid3hcrx_bytes_recv;
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u32 ccid3hcrx_x_recv;
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u32 ccid3hcrx_rtt;
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ktime_t ccid3hcrx_tstamp_last_feedback;
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struct tfrc_rx_hist ccid3hcrx_hist;
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struct tfrc_loss_hist ccid3hcrx_li_hist;
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