Date: Fri, 5 Mar 2021 23:42:28 GMT From: Richard Scheffenegger <rscheff@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: e53138694aa4 - main - tcp: Add prr_out in preparation for PRR/nonSACK and LRD Message-ID: <202103052342.125NgSFQ035311@gitrepo.freebsd.org>
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The branch main has been updated by rscheff: URL: https://cgit.FreeBSD.org/src/commit/?id=e53138694aa41c24c17847afe959225ce0eeff91 commit e53138694aa41c24c17847afe959225ce0eeff91 Author: Richard Scheffenegger <rscheff@FreeBSD.org> AuthorDate: 2021-03-05 23:36:48 +0000 Commit: Richard Scheffenegger <rscheff@FreeBSD.org> CommitDate: 2021-03-05 23:38:22 +0000 tcp: Add prr_out in preparation for PRR/nonSACK and LRD Reviewed By: #transport, kbowling MFC after: 3 days Sponsored By: Netapp, Inc. Differential Revision: https://reviews.freebsd.org/D29058 --- sys/netinet/tcp_input.c | 21 ++++++++------------- sys/netinet/tcp_output.c | 8 ++++++++ sys/netinet/tcp_var.h | 2 +- 3 files changed, 17 insertions(+), 14 deletions(-) diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index a5d2e1676364..7dfe1dbd4e4f 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -510,6 +510,7 @@ cc_post_recovery(struct tcpcb *tp, struct tcphdr *th) } /* XXXLAS: EXIT_RECOVERY ? */ tp->t_bytes_acked = 0; + tp->sackhint.prr_out = 0; } /* @@ -2595,17 +2596,14 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, imax(1, tp->snd_nxt - tp->snd_una); snd_cnt = howmany((long)tp->sackhint.prr_delivered * tp->snd_ssthresh, tp->sackhint.recover_fs) - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)); + tp->sackhint.prr_out; } else { if (V_tcp_do_prr_conservative) limit = tp->sackhint.prr_delivered - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)); + tp->sackhint.prr_out; else limit = imax(tp->sackhint.prr_delivered - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)), + tp->sackhint.prr_out, del_data) + maxseg; snd_cnt = imin(tp->snd_ssthresh - pipe, limit); } @@ -3972,18 +3970,15 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th) imax(1, tp->snd_nxt - tp->snd_una); snd_cnt = howmany((long)tp->sackhint.prr_delivered * tp->snd_ssthresh, tp->sackhint.recover_fs) - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)); + tp->sackhint.prr_out; } else { if (V_tcp_do_prr_conservative) limit = tp->sackhint.prr_delivered - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)); + tp->sackhint.prr_out; else limit = imax(tp->sackhint.prr_delivered - - (tp->sackhint.sack_bytes_rexmit + - (tp->snd_nxt - tp->snd_recover)), - del_data) + maxseg; + tp->sackhint.prr_out, del_data) + + maxseg; snd_cnt = imin((tp->snd_ssthresh - pipe), limit); } snd_cnt = imax(snd_cnt, 0) / maxseg; diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c index b4c7ab0a1ab7..d4b5a328e2a6 100644 --- a/sys/netinet/tcp_output.c +++ b/sys/netinet/tcp_output.c @@ -1236,6 +1236,14 @@ send: p->rxmit += len; tp->sackhint.sack_bytes_rexmit += len; } + if (IN_RECOVERY(tp->t_flags)) { + /* + * Account all bytes transmitted while + * IN_RECOVERY, simplifying PRR and + * Lost Retransmit Detection + */ + tp->sackhint.prr_out += len; + } th->th_ack = htonl(tp->rcv_nxt); if (optlen) { bcopy(opt, th + 1, optlen); diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h index 30009fa18205..8cd0c828ad66 100644 --- a/sys/netinet/tcp_var.h +++ b/sys/netinet/tcp_var.h @@ -115,7 +115,7 @@ struct sackhint { */ uint32_t recover_fs; /* Flight Size at the start of Loss recovery */ uint32_t prr_delivered; /* Total bytes delivered using PRR */ - uint32_t _pad[1]; /* TBD */ + uint32_t prr_out; /* Bytes sent during IN_RECOVERY */ }; #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
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