liquidio: fix VF driver off-by-one bug when setting ethtool -C ethX rx-frames

Weilin Chang · davem330 · commit 0430a2605473 · 2017-06-14T15:42:20.000-04:00
Signed-off-by: Weilin Chang &lt;weilin.chang@cavium.com&gt;
Signed-off-by: Derek Chickles &lt;derek.chickles@cavium.com&gt;
Signed-off-by: Felix Manlunas &lt;felix.manlunas@cavium.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c b/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c
@@ -1808,7 +1808,7 @@ oct_cfg_rx_intrcnt(struct lio *lio,
 			    (octeon_read_csr64(
 				 oct, CN23XX_VF_SLI_OQ_PKT_INT_LEVELS(q_no)) &
 			     (0x3fffff00000000UL)) |
-				rx_max_coalesced_frames);
+				(rx_max_coalesced_frames - 1));
 			/*consider writing to resend bit here*/
 		}
 		intrmod->rx_frames = rx_max_coalesced_frames;

Original file line number	Diff line number	Diff line change
`@@ -1808,7 +1808,7 @@ oct_cfg_rx_intrcnt(struct lio *lio,`
`1808`	`1808`	`(octeon_read_csr64(`
`1809`	`1809`	`oct, CN23XX_VF_SLI_OQ_PKT_INT_LEVELS(q_no)) &`
`1810`	`1810`	`(0x3fffff00000000UL)) \|`
`1811`		`- rx_max_coalesced_frames);`
	`1811`	`+ (rx_max_coalesced_frames - 1));`
`1812`	`1812`	`/consider writing to resend bit here/`
`1813`	`1813`	`}`
`1814`	`1814`	`intrmod->rx_frames = rx_max_coalesced_frames;`