linux-kernel - [PATCH v2] qed: Avoid implicit enum conversion in qed_ooo_submit_tx

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Date:   Thu,  4 Oct 2018 09:39:20 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ariel Elior <Ariel.Elior@...ium.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Dept-EngEverestLinuxL2@...ium.com,
        Tomer Tayar <Tomer.Tayar@...ium.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH v2] qed: Avoid implicit enum conversion in qed_ooo_submit_tx_buffers

Clang warns when one enumerated type is implicitly converted to another.

drivers/net/ethernet/qlogic/qed/qed_ll2.c:799:32: warning: implicit
conversion from enumeration type 'enum core_tx_dest' to different
enumeration type 'enum qed_ll2_tx_dest' [-Wenum-conversion]
                tx_pkt.tx_dest = p_ll2_conn->tx_dest;
                               ~ ~~~~~~~~~~~~^~~~~~~
1 warning generated.

Fix this by using a switch statement to convert between the enumerated
values since they are not 1 to 1, which matches how the rest of the
driver handles this conversion.

Link: https://github.com/ClangBuiltLinux/linux/issues/125
Suggested-by: Tomer Tayar <Tomer.Tayar@...ium.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

v1 -> v2:

* Use an explicit switch statement to convert between the enumerated
  types like the rest of the driver, as suggested by Tomer.

 drivers/net/ethernet/qlogic/qed/qed_ll2.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index da13117a604a..aa633381aa47 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -796,7 +796,18 @@ qed_ooo_submit_tx_buffers(struct qed_hwfn *p_hwfn,
 		tx_pkt.vlan = p_buffer->vlan;
 		tx_pkt.bd_flags = bd_flags;
 		tx_pkt.l4_hdr_offset_w = l4_hdr_offset_w;
-		tx_pkt.tx_dest = p_ll2_conn->tx_dest;
+		switch (p_ll2_conn->tx_dest) {
+		case CORE_TX_DEST_NW:
+			tx_pkt.tx_dest = QED_LL2_TX_DEST_NW;
+			break;
+		case CORE_TX_DEST_LB:
+			tx_pkt.tx_dest = QED_LL2_TX_DEST_LB;
+			break;
+		case CORE_TX_DEST_DROP:
+		default:
+			tx_pkt.tx_dest = QED_LL2_TX_DEST_DROP;
+			break;
+		}
 		tx_pkt.first_frag = first_frag;
 		tx_pkt.first_frag_len = p_buffer->packet_length;
 		tx_pkt.cookie = p_buffer;
-- 
2.19.0