Date: Thu, 05 Feb 2026 21:57:40 +0000 From: Navdeep Parhar <np@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 9352d2f6dd55 - main - cxgbe(4): sysctl to disable/enable the TCB cache Message-ID: <69851254.47e36.400be12a@gitrepo.freebsd.org>
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The branch main has been updated by np: URL: https://cgit.FreeBSD.org/src/commit/?id=9352d2f6dd55afcf0ac24d2806da7c6febf19589 commit 9352d2f6dd55afcf0ac24d2806da7c6febf19589 Author: Navdeep Parhar <np@FreeBSD.org> AuthorDate: 2026-02-05 19:52:51 +0000 Commit: Navdeep Parhar <np@FreeBSD.org> CommitDate: 2026-02-05 20:11:58 +0000 cxgbe(4): sysctl to disable/enable the TCB cache The TCB cache can be enabled/disabled at any time on the T7 and this commit adds a sysctl to do that. This is for debug only. # sysctl dev.chnex.0.misc.tcb_cache=0 # sysctl dev.chnex.0.misc.tcb_cache=1 MFC after: 1 week Sponsored by: Chelsio Communications --- sys/dev/cxgbe/t4_main.c | 41 +++++++++++++++++++++++++++++++++++++++++ sys/dev/cxgbe/t4_sge.c | 15 ++++++++++----- 2 files changed, 51 insertions(+), 5 deletions(-) diff --git a/sys/dev/cxgbe/t4_main.c b/sys/dev/cxgbe/t4_main.c index 3237c6649713..e35bb9f64951 100644 --- a/sys/dev/cxgbe/t4_main.c +++ b/sys/dev/cxgbe/t4_main.c @@ -900,6 +900,7 @@ static int sysctl_ulprx_la(SYSCTL_HANDLER_ARGS); static int sysctl_wcwr_stats(SYSCTL_HANDLER_ARGS); static int sysctl_cpus(SYSCTL_HANDLER_ARGS); static int sysctl_reset(SYSCTL_HANDLER_ARGS); +static int sysctl_tcb_cache(SYSCTL_HANDLER_ARGS); #ifdef TCP_OFFLOAD static int sysctl_tls(SYSCTL_HANDLER_ARGS); static int sysctl_tp_tick(SYSCTL_HANDLER_ARGS); @@ -8119,6 +8120,12 @@ t4_sysctls(struct adapter *sc) sysctl_wcwr_stats, "A", "write combined work requests"); } + if (chip_id(sc) >= CHELSIO_T7) { + SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "tcb_cache", + CTLTYPE_INT | CTLFLAG_RW, sc, 0, sysctl_tcb_cache, "I", + "1 = enabled (default), 0 = disabled (for debug only)"); + } + #ifdef KERN_TLS if (is_ktls(sc)) { /* @@ -12204,6 +12211,40 @@ sysctl_reset(SYSCTL_HANDLER_ARGS) return (0); } +static int +sysctl_tcb_cache(SYSCTL_HANDLER_ARGS) +{ + struct adapter *sc = arg1; + u_int val, v; + int rc; + + mtx_lock(&sc->reg_lock); + if (hw_off_limits(sc)) { + rc = ENXIO; + goto done; + } + t4_tp_pio_read(sc, &v, 1, A_TP_CMM_CONFIG, 1); + mtx_unlock(&sc->reg_lock); + + val = v & F_GLFL ? 0 : 1; + rc = sysctl_handle_int(oidp, &val, 0, req); + if (rc != 0 || req->newptr == NULL) + return (rc); + if (val == 0) + v |= F_GLFL; + else + v &= ~F_GLFL; + + mtx_lock(&sc->reg_lock); + if (hw_off_limits(sc)) + rc = ENXIO; + else + t4_tp_pio_write(sc, &v, 1, A_TP_CMM_CONFIG, 1); +done: + mtx_unlock(&sc->reg_lock); + return (rc); +} + #ifdef TCP_OFFLOAD static int sysctl_tls(SYSCTL_HANDLER_ARGS) diff --git a/sys/dev/cxgbe/t4_sge.c b/sys/dev/cxgbe/t4_sge.c index b6d44792dce4..af18b3019760 100644 --- a/sys/dev/cxgbe/t4_sge.c +++ b/sys/dev/cxgbe/t4_sge.c @@ -828,12 +828,17 @@ t4_tweak_chip_settings(struct adapter *sc) t4_set_reg_field(sc, A_SGE_ITP_CONTROL, m, v); if (sc->debug_flags & DF_DISABLE_TCB_CACHE) { - m = V_RDTHRESHOLD(M_RDTHRESHOLD) | F_WRTHRTHRESHEN | - V_WRTHRTHRESH(M_WRTHRTHRESH); t4_tp_pio_read(sc, &v, 1, A_TP_CMM_CONFIG, 1); - v &= ~m; - v |= V_RDTHRESHOLD(1) | F_WRTHRTHRESHEN | - V_WRTHRTHRESH(16); + if (chip_id(sc) >= CHELSIO_T7) { + v |= F_GLFL; + } else { + m = V_RDTHRESHOLD(M_RDTHRESHOLD) | + F_WRTHRTHRESHEN | + V_WRTHRTHRESH(M_WRTHRTHRESH); + v &= ~m; + v |= V_RDTHRESHOLD(1) | F_WRTHRTHRESHEN | + V_WRTHRTHRESH(16); + } t4_tp_pio_write(sc, &v, 1, A_TP_CMM_CONFIG, 1); } }home | help
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