netdev - [PATCH net-next] cxgb4: fix incorrect cim

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Message-Id: <1495188738-20546-1-git-send-email-ganeshgr@chelsio.com>
Date:   Fri, 19 May 2017 15:42:18 +0530
From:   Ganesh Goudar <ganeshgr@...lsio.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     nirranjan@...lsio.com, indranil@...lsio.com,
        Ganesh Goudar <ganeshgr@...lsio.com>
Subject: [PATCH net-next] cxgb4: fix incorrect cim_la output for T6

take care of UpDbgLaRdPtr[0-3] restriction for T6

Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index aded42b96..917b46b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -8268,6 +8268,13 @@ int t4_cim_read_la(struct adapter *adap, u32 *la_buf, unsigned int *wrptr)
 		if (ret)
 			break;
 		idx = (idx + 1) & UPDBGLARDPTR_M;
+
+		/* Bits 0-3 of UpDbgLaRdPtr can be between 0000 to 1001 to
+		 * identify the 32-bit portion of the full 312-bit data
+		 */
+		if (is_t6(adap->params.chip))
+			while ((idx & 0xf) > 9)
+				idx = (idx + 1) % UPDBGLARDPTR_M;
 	}
 restart:
 	if (cfg & UPDBGLAEN_F) {
-- 
2.1.0