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author | np <np@FreeBSD.org> | 2014-09-22 13:07:03 +0000 |
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committer | np <np@FreeBSD.org> | 2014-09-22 13:07:03 +0000 |
commit | ed8e08d5db88e85f0297ca7eb59f9837bcba8720 (patch) | |
tree | 0a3c85c67a981be5f853c10d1528b91e0f1a0ad8 /sys/dev/cxgbe | |
parent | d214dc3b2061ca3ef809ec2b3cdd0d4cd7b0d821 (diff) | |
download | FreeBSD-src-ed8e08d5db88e85f0297ca7eb59f9837bcba8720.zip FreeBSD-src-ed8e08d5db88e85f0297ca7eb59f9837bcba8720.tar.gz |
MFC r271450:
cxgbe(4): knobs to enable/disable PAUSE frame based flow control.
Approved by: re (glebius)
Diffstat (limited to 'sys/dev/cxgbe')
-rw-r--r-- | sys/dev/cxgbe/t4_main.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/sys/dev/cxgbe/t4_main.c b/sys/dev/cxgbe/t4_main.c index cc51b76..d5db899 100644 --- a/sys/dev/cxgbe/t4_main.c +++ b/sys/dev/cxgbe/t4_main.c @@ -281,6 +281,15 @@ static char t4_cfg_file[32] = DEFAULT_CF; TUNABLE_STR("hw.cxgbe.config_file", t4_cfg_file, sizeof(t4_cfg_file)); /* + * PAUSE settings (bit 0, 1 = rx_pause, tx_pause respectively). + * rx_pause = 1 to heed incoming PAUSE frames, 0 to ignore them. + * tx_pause = 1 to emit PAUSE frames when the rx FIFO reaches its high water + * mark or when signalled to do so, 0 to never emit PAUSE. + */ +static int t4_pause_settings = PAUSE_TX | PAUSE_RX; +TUNABLE_INT("hw.cxgbe.pause_settings", &t4_pause_settings); + +/* * Firmware auto-install by driver during attach (0, 1, 2 = prohibited, allowed, * encouraged respectively). */ @@ -393,6 +402,7 @@ static int sysctl_holdoff_tmr_idx(SYSCTL_HANDLER_ARGS); static int sysctl_holdoff_pktc_idx(SYSCTL_HANDLER_ARGS); static int sysctl_qsize_rxq(SYSCTL_HANDLER_ARGS); static int sysctl_qsize_txq(SYSCTL_HANDLER_ARGS); +static int sysctl_pause_settings(SYSCTL_HANDLER_ARGS); static int sysctl_handle_t4_reg64(SYSCTL_HANDLER_ARGS); static int sysctl_temperature(SYSCTL_HANDLER_ARGS); #ifdef SBUF_DRAIN @@ -696,6 +706,12 @@ t4_attach(device_t dev) sc->port[i] = NULL; goto done; } + + pi->link_cfg.requested_fc &= ~(PAUSE_TX | PAUSE_RX); + pi->link_cfg.requested_fc |= t4_pause_settings; + pi->link_cfg.fc &= ~(PAUSE_TX | PAUSE_RX); + pi->link_cfg.fc |= t4_pause_settings; + rc = -t4_link_start(sc, sc->mbox, pi->tx_chan, &pi->link_cfg); if (rc != 0) { device_printf(dev, "port %d l1cfg failed: %d\n", i, rc); @@ -4755,6 +4771,10 @@ cxgbe_sysctls(struct port_info *pi) CTLTYPE_INT | CTLFLAG_RW, pi, 0, sysctl_qsize_txq, "I", "tx queue size"); + SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "pause_settings", + CTLTYPE_STRING | CTLFLAG_RW, pi, PAUSE_TX, sysctl_pause_settings, + "A", "PAUSE settings (bit 0 = rx_pause, bit 1 = tx_pause)"); + /* * dev.cxgbe.X.stats. */ @@ -5136,6 +5156,65 @@ sysctl_qsize_txq(SYSCTL_HANDLER_ARGS) } static int +sysctl_pause_settings(SYSCTL_HANDLER_ARGS) +{ + struct port_info *pi = arg1; + struct adapter *sc = pi->adapter; + struct link_config *lc = &pi->link_cfg; + int rc; + + if (req->newptr == NULL) { + struct sbuf *sb; + static char *bits = "\20\1PAUSE_RX\2PAUSE_TX"; + + rc = sysctl_wire_old_buffer(req, 0); + if (rc != 0) + return(rc); + + sb = sbuf_new_for_sysctl(NULL, NULL, 128, req); + if (sb == NULL) + return (ENOMEM); + + sbuf_printf(sb, "%b", lc->fc & (PAUSE_TX | PAUSE_RX), bits); + rc = sbuf_finish(sb); + sbuf_delete(sb); + } else { + char s[2]; + int n; + + s[0] = '0' + (lc->requested_fc & (PAUSE_TX | PAUSE_RX)); + s[1] = 0; + + rc = sysctl_handle_string(oidp, s, sizeof(s), req); + if (rc != 0) + return(rc); + + if (s[1] != 0) + return (EINVAL); + if (s[0] < '0' || s[0] > '9') + return (EINVAL); /* not a number */ + n = s[0] - '0'; + if (n & ~(PAUSE_TX | PAUSE_RX)) + return (EINVAL); /* some other bit is set too */ + + rc = begin_synchronized_op(sc, pi, SLEEP_OK | INTR_OK, "t4PAUSE"); + if (rc) + return (rc); + if ((lc->requested_fc & (PAUSE_TX | PAUSE_RX)) != n) { + int link_ok = lc->link_ok; + + lc->requested_fc &= ~(PAUSE_TX | PAUSE_RX); + lc->requested_fc |= n; + rc = -t4_link_start(sc, sc->mbox, pi->tx_chan, lc); + lc->link_ok = link_ok; /* restore */ + } + end_synchronized_op(sc, 0); + } + + return (rc); +} + +static int sysctl_handle_t4_reg64(SYSCTL_HANDLER_ARGS) { struct adapter *sc = arg1; |