[net] Octeontx2-pf: Fix Backpresure configuration

From: Hariprasad Kelam
Date: Tue Jun 17 2025 - 02:34:38 EST


NIX block can receive packets from multiple links such as
MAC (RPM), LBK and CPT.

-----------------
RPM --| NIX |
-----------------
|
|
LBK

Each link supports multiple channels for example RPM link supports
16 channels. In case of link oversubsribe, NIX will assert backpressure
on receive channels.

The previous patch considered a single channel per link, resulting in
backpressure not being enabled on the remaining channels

Fixes: a7ef63dbd588 ("octeontx2-af: Disable backpressure between CPT and NIX")
Signed-off-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 6f572589f1e5..6b5c9536d26d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -1822,7 +1822,7 @@ int otx2_nix_config_bp(struct otx2_nic *pfvf, bool enable)
req->chan_cnt = IEEE_8021QAZ_MAX_TCS;
req->bpid_per_chan = 1;
} else {
- req->chan_cnt = 1;
+ req->chan_cnt = pfvf->hw.rx_chan_cnt;
req->bpid_per_chan = 0;
}

@@ -1847,7 +1847,7 @@ int otx2_nix_cpt_config_bp(struct otx2_nic *pfvf, bool enable)
req->chan_cnt = IEEE_8021QAZ_MAX_TCS;
req->bpid_per_chan = 1;
} else {
- req->chan_cnt = 1;
+ req->chan_cnt = pfvf->hw.rx_chan_cnt;
req->bpid_per_chan = 0;
}

--
2.34.1