From 822967e7e5b24d5fa980f69cab7b2982e1b6fa42 Mon Sep 17 00:00:00 2001 From: Navdeep Parhar Date: Tue, 29 Sep 2020 09:25:52 +0000 Subject: [PATCH] cxgbe(4): Avoid unnecessary work in the firmware during netmap tx. Bind the netmap tx queues to a special '0xff' scheduling class which makes the firmware skip some processing related to rate limiting on the outgoing traffic. Future firmwares will do this automatically. MFC after: 1 week Sponsored by: Chelsio Communications --- sys/dev/cxgbe/t4_netmap.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/sys/dev/cxgbe/t4_netmap.c b/sys/dev/cxgbe/t4_netmap.c index ecf7d76b12b..ffe6dc1b7b9 100644 --- a/sys/dev/cxgbe/t4_netmap.c +++ b/sys/dev/cxgbe/t4_netmap.c @@ -329,6 +329,22 @@ alloc_nm_txq_hwq(struct vi_info *vi, struct sge_nm_txq *nm_txq) nm_txq->udb = (volatile void *)udb; } + if (sc->params.fw_vers < FW_VERSION32(1, 25, 1, 0)) { + uint32_t param, val; + + param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) | + V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DMAQ_EQ_SCHEDCLASS_ETH) | + V_FW_PARAMS_PARAM_YZ(nm_txq->cntxt_id); + val = 0xff; + rc = -t4_set_params(sc, sc->mbox, sc->pf, 0, 1, ¶m, &val); + if (rc != 0) { + device_printf(vi->dev, + "failed to bind netmap txq %d to class 0xff: %d\n", + nm_txq->cntxt_id, rc); + rc = 0; + } + } + return (rc); }