Author: np
Date: Wed Feb 5 00:13:15 2020
New Revision: 357553
URL: https://svnweb.freebsd.org/changeset/base/357553
Log:
cxgbe(4): Add a knob to allow netmap tx traffic to be checksummed by
the hardware.
hw.cxgbe.nm_txcsum=1
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Modified:
head/sys/dev/cxgbe/t4_netmap.c
Modified: head/sys/dev/cxgbe/t4_netmap.c
==============================================================================
--- head/sys/dev/cxgbe/t4_netmap.c Wed Feb 5 00:08:58 2020
(r357552)
+++ head/sys/dev/cxgbe/t4_netmap.c Wed Feb 5 00:13:15 2020
(r357553)
@@ -110,6 +110,16 @@ static int nm_split_rss = 0;
SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_split_rss, CTLFLAG_RWTUN,
&nm_split_rss, 0, "Split the netmap rx queues into two groups.");
+/*
+ * netmap(4) says "netmap does not use features such as checksum offloading,
TCP
+ * segmentation offloading, encryption, VLAN encapsulation/decapsulation, etc."
+ * but this knob can be used to get the hardware to checksum all tx traffic
+ * anyway.
+ */
+static int nm_txcsum = 0;
+SYSCTL_INT(_hw_cxgbe, OID_AUTO, nm_txcsum, CTLFLAG_RWTUN,
+ &nm_txcsum, 0, "Enable transmit checksum offloading.");
+
static int
alloc_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq, int cong)
{
@@ -696,13 +706,8 @@ cxgbe_nm_tx(struct adapter *sc, struct sge_nm_txq *nm_
cpl->ctrl0 = nm_txq->cpl_ctrl0;
cpl->pack = 0;
cpl->len = htobe16(slot->len);
- /*
- * netmap(4) says "netmap does not use features such as
- * checksum offloading, TCP segmentation offloading,
- * encryption, VLAN encapsulation/decapsulation, etc."
- */
- cpl->ctrl1 = htobe64(F_TXPKT_IPCSUM_DIS |
- F_TXPKT_L4CSUM_DIS);
+ cpl->ctrl1 = nm_txcsum ? 0 :
+ htobe64(F_TXPKT_IPCSUM_DIS | F_TXPKT_L4CSUM_DIS);
usgl = (void *)(cpl + 1);
usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
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