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cxgb4: Updates for T5 SGE's Egress Congestion Threshold

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Based on original work by Casey Leedom <leedom@chelsio.com>

Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kumar Sanghvi 2014-03-13 20:50:49 +05:30 committed by David S. Miller
parent 0f4d201f74
commit c2b955e006
2 changed files with 19 additions and 5 deletions
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18
drivers/net/ethernet/chelsio/cxgb4/sge.c
View file

@ -2776,8 +2776,8 @@ static int t4_sge_init_hard(struct adapter *adap)
int t4_sge_init(struct adapter *adap)
{
struct sge *s = &adap->sge;
u32 sge_control;
int ret;
u32 sge_control, sge_conm_ctrl;
int ret, egress_threshold;
/*
* Ingress Padding Boundary and Egress Status Page Size are set up by
@ -2802,10 +2802,18 @@ int t4_sge_init(struct adapter *adap)
* SGE's Egress Congestion Threshold. If it isn't, then we can get
* stuck waiting for new packets while the SGE is waiting for us to
* give it more Free List entries. (Note that the SGE's Egress
* Congestion Threshold is in units of 2 Free List pointers.)
* Congestion Threshold is in units of 2 Free List pointers.) For T4,
* there was only a single field to control this. For T5 there's the
* original field which now only applies to Unpacked Mode Free List
* buffers and a new field which only applies to Packed Mode Free List
* buffers.
*/
s->fl_starve_thres
= EGRTHRESHOLD_GET(t4_read_reg(adap, SGE_CONM_CTRL))*2 + 1;
sge_conm_ctrl = t4_read_reg(adap, SGE_CONM_CTRL);
if (is_t4(adap->params.chip))
egress_threshold = EGRTHRESHOLD_GET(sge_conm_ctrl);
else
egress_threshold = EGRTHRESHOLDPACKING_GET(sge_conm_ctrl);
s->fl_starve_thres = 2*egress_threshold + 1;
setup_timer(&s->rx_timer, sge_rx_timer_cb, (unsigned long)adap);
setup_timer(&s->tx_timer, sge_tx_timer_cb, (unsigned long)adap);

6
drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
View file

@ -230,6 +230,12 @@
#define EGRTHRESHOLD(x) ((x) << EGRTHRESHOLDshift)
#define EGRTHRESHOLD_GET(x) (((x) & EGRTHRESHOLD_MASK) >> EGRTHRESHOLDshift)
#define EGRTHRESHOLDPACKING_MASK 0x3fU
#define EGRTHRESHOLDPACKING_SHIFT 14
#define EGRTHRESHOLDPACKING(x) ((x) << EGRTHRESHOLDPACKING_SHIFT)
#define EGRTHRESHOLDPACKING_GET(x) (((x) >> EGRTHRESHOLDPACKING_SHIFT) & \
EGRTHRESHOLDPACKING_MASK)
#define SGE_DBFIFO_STATUS 0x10a4
#define HP_INT_THRESH_SHIFT 28
#define HP_INT_THRESH_MASK 0xfU