From: Stefano Brivio <sbrivio@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: passt-dev@passt.top
Subject: Re: [PATCH 08/11] tcp_splice: Exploit side symmetry in tcp_splice_timer()
Date: Fri, 3 Nov 2023 17:21:53 +0100 [thread overview]
Message-ID: <20231103172153.2f9894a8@elisabeth> (raw)
In-Reply-To: <20231012015114.2612066-9-david@gibson.dropbear.id.au>
On Thu, 12 Oct 2023 12:51:11 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:
> tcp_splice_timer() has two very similar blocks one after another that
> handle the SO_RCVLOWAT flags for the two sides of the connection. We can
> deduplicate this with a loop across the two sides.
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> tcp_splice.c | 27 +++++++++++----------------
> 1 file changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/tcp_splice.c b/tcp_splice.c
> index 4a0580c..259d774 100644
> --- a/tcp_splice.c
> +++ b/tcp_splice.c
> @@ -835,30 +835,25 @@ void tcp_splice_init(struct ctx *c)
> void tcp_splice_timer(struct ctx *c, union tcp_conn *conn_union)
> {
> struct tcp_splice_conn *conn = &conn_union->splice;
> + int side;
>
> if (conn->flags & CLOSING) {
> tcp_splice_destroy(c, conn_union);
> return;
> }
>
> - if ( (conn->flags & RCVLOWAT_SET_0) &&
> - !(conn->flags & RCVLOWAT_ACT_0)) {
> - if (setsockopt(conn->s[0], SOL_SOCKET, SO_RCVLOWAT,
> - &((int){ 1 }), sizeof(int))) {
> - trace("TCP (spliced): can't set SO_RCVLOWAT on "
> - "%i", conn->s[0]);
> - }
> - conn_flag(c, conn, ~RCVLOWAT_SET_0);
> - }
> + for (side = 0; side < SIDES; side++) {
> + uint8_t set = side == 0 ? RCVLOWAT_SET_0 : RCVLOWAT_SET_1;
> + uint8_t act = side == 0 ? RCVLOWAT_ACT_0 : RCVLOWAT_ACT_1;
>
> - if ( (conn->flags & RCVLOWAT_SET_1) &&
> - !(conn->flags & RCVLOWAT_ACT_1)) {
> - if (setsockopt(conn->s[1], SOL_SOCKET, SO_RCVLOWAT,
> - &((int){ 1 }), sizeof(int))) {
> - trace("TCP (spliced): can't set SO_RCVLOWAT on "
> - "%i", conn->s[1]);
> + if ( (conn->flags & set) && !(conn->flags & act)) {
^
Nit: this extra whitespace is now useless.
--
Stefano
next prev parent reply other threads:[~2023-11-03 16:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-12 1:51 [PATCH 00/11] tcp_splice: Better exploit symmetry between sides of connection David Gibson
2023-10-12 1:51 ` [PATCH 01/11] tcp_splice: Remove redundant tcp_splice_epoll_ctl() David Gibson
2023-10-12 1:51 ` [PATCH 02/11] tcp_splice: Correct error handling in tcp_splice_epoll_ctl() David Gibson
2023-10-12 1:51 ` [PATCH 03/11] tcp_splice: Don't handle EPOLL_CTL_DEL as part of tcp_splice_epoll_ctl() David Gibson
2023-11-03 16:20 ` Stefano Brivio
2023-11-04 5:56 ` David Gibson
2023-10-12 1:51 ` [PATCH 04/11] tcp_splice: Remove unnecessary forward declaration David Gibson
2023-10-12 1:51 ` [PATCH 05/11] tcp_splice: Avoid awkward temporaries in tcp_splice_epoll_ctl() David Gibson
2023-11-03 16:21 ` Stefano Brivio
2023-11-04 5:58 ` David Gibson
2023-10-12 1:51 ` [PATCH 06/11] tcp_splice: Don't pool pipes in pairs David Gibson
2023-10-12 1:51 ` [PATCH 07/11] tcp_splice: Rename sides of connection from a/b to 0/1 David Gibson
2023-10-12 1:51 ` [PATCH 08/11] tcp_splice: Exploit side symmetry in tcp_splice_timer() David Gibson
2023-11-03 16:21 ` Stefano Brivio [this message]
2023-11-04 5:59 ` David Gibson
2023-10-12 1:51 ` [PATCH 09/11] tcp_splice: Exploit side symmetry in tcp_splice_connect_finish() David Gibson
2023-10-12 1:51 ` [PATCH 10/11] tcp_splice: Exploit side symmetry in tcp_splice_destroy() David Gibson
2023-11-03 16:22 ` Stefano Brivio
2023-11-06 2:39 ` David Gibson
2023-11-06 13:21 ` Stefano Brivio
2023-10-12 1:51 ` [PATCH 11/11] tcp_splice: Simplify selection of socket and pipe sides in socket handler David Gibson
2023-11-03 16:21 ` Stefano Brivio
2023-11-04 6:02 ` David Gibson
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