diff options
| author |   Rahul Lakkireddy <rahul.lakkireddy@chelsio.com> | 2020-05-15 22:41:04 +0530 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-05-15 10:54:07 -0700 |
| commit | 4bccfc036abbdf510de808925c646c8c49e0309e (patch) | |
| tree | adcedec636264f3924879330cf8459b8df542cc3 /drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c | |
| parent | cxgb4: improve credits recovery in TC-MQPRIO Tx path (diff) | |
| download | wireguard-linux-4bccfc036abbdf510de808925c646c8c49e0309e.tar.xz wireguard-linux-4bccfc036abbdf510de808925c646c8c49e0309e.zip | |
cxgb4: tune burst buffer size for TC-MQPRIO offload
For each traffic class, firmware handles up to 4 * MTU amount of data
per burst cycle. Under heavy load, this small buffer size is a
bottleneck when buffering large TSO packets in <= 1500 MTU case.
Increase the burst buffer size to 8 * MTU when supported.
Also, keep the driver's traffic class configuration API similar to
the firmware API counterpart.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c')
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c index e6af4906d674..56079c9937db 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c @@ -342,6 +342,13 @@ static int cxgb4_mqprio_alloc_tc(struct net_device *dev, p.u.params.minrate = div_u64(mqprio->min_rate[i] * 8, 1000); p.u.params.maxrate = div_u64(mqprio->max_rate[i] * 8, 1000); + /* Request larger burst buffer for smaller MTU, so + * that hardware can work on more data per burst + * cycle. + */ + if (dev->mtu <= ETH_DATA_LEN) + p.u.params.burstsize = 8 * dev->mtu; + e = cxgb4_sched_class_alloc(dev, &p); if (!e) { ret = -ENOMEM; |