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cxgb4: request the TX CIDX updates to status page 

For adapters which support the SGE Doorbell Queue Timer facility,
we configured the Ethernet TX Queues to send CIDX Updates to the
Associated Ethernet RX Response Queue with CPL_SGE_EGR_UPDATE
messages to allow us to respond more quickly to the CIDX Updates.
But, this was adding load to PCIe Link RX bandwidth and,
potentially, resulting in higher CPU Interrupt load.

This patch requests the HW to deliver the CIDX updates to the TX
queue status page rather than generating an ingress queue message
(as an interrupt). With this patch, the load on RX bandwidth is
reduced and a substantial improvement in BW is noticed at lower
IO sizes.

Fixes: d429005fdf ("cxgb4/cxgb4vf: Add support for SGE doorbell queue timer")
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Raju Rangoju 2019-10-23 23:03:55 +05:30 committed by David S. Miller
parent d4e4fdf9e4
commit 7c3bebc3d8
1 changed files with 2 additions and 6 deletions
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8
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -3791,15 +3791,11 @@ int t4_sge_alloc_eth_txq(struct adapter *adap, struct sge_eth_txq *txq,
* write the CIDX Updates into the Status Page at the end of the * write the CIDX Updates into the Status Page at the end of the
* TX Queue. * TX Queue.
*/ */
c.autoequiqe_to_viid = htonl((dbqt c.autoequiqe_to_viid = htonl(FW_EQ_ETH_CMD_AUTOEQUEQE_F |
? FW_EQ_ETH_CMD_AUTOEQUIQE_F
: FW_EQ_ETH_CMD_AUTOEQUEQE_F) |
FW_EQ_ETH_CMD_VIID_V(pi->viid)); FW_EQ_ETH_CMD_VIID_V(pi->viid));
c.fetchszm_to_iqid = c.fetchszm_to_iqid =
htonl(FW_EQ_ETH_CMD_HOSTFCMODE_V(dbqt htonl(FW_EQ_ETH_CMD_HOSTFCMODE_V(HOSTFCMODE_STATUS_PAGE_X) |
? HOSTFCMODE_INGRESS_QUEUE_X
: HOSTFCMODE_STATUS_PAGE_X) |
FW_EQ_ETH_CMD_PCIECHN_V(pi->tx_chan) | FW_EQ_ETH_CMD_PCIECHN_V(pi->tx_chan) |
FW_EQ_ETH_CMD_FETCHRO_F | FW_EQ_ETH_CMD_IQID_V(iqid)); FW_EQ_ETH_CMD_FETCHRO_F | FW_EQ_ETH_CMD_IQID_V(iqid));