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cxgbe(4): Avoid unnecessary work in the firmware during netmap tx.

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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
This commit is contained in:
Navdeep Parhar 2020-09-29 09:25:52 +00:00
parent 7efe256233
commit 822967e7e5
1 changed files with 16 additions and 0 deletions
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16
sys/dev/cxgbe/t4_netmap.c
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@ -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, &param, &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);
}