FW: [PATCH v7 1/4] net/bnx2x: fix warnings about rte_memcpy lengths

FW: [PATCH v7 1/4] net/bnx2x: fix warnings about rte_memcpy lengths

[Morten Brørup]

Julien, welcome aboard as the new bnx2x maintainer. Can you please review this patch?

Med venlig hilsen / Kind regards,
-Morten Brørup

-----Original Message-----
From: Morten Brørup [mailto:mb@smartsharesystems.com] 
Sent: Monday, 16 January 2023 14.07
To: dev@dpdk.org; roretzla@linux.microsoft.com; rmody@marvell.com; timothy.mcdaniel@intel.com; matan@nvidia.com; viacheslavo@nvidia.com
Cc: ruifeng.wang@arm.com; zhoumin@loongson.cn; drc@linux.vnet.ibm.com; kda@semihalf.com; bruce.richardson@intel.com; konstantin.v.ananyev@yandex.ru; Morten Brørup; stephen@networkplumber.org; shshaikh@marvell.com
Subject: [PATCH v7 1/4] net/bnx2x: fix warnings about rte_memcpy lengths

Bugfix: The vlan in the bulletin does not contain a VLAN header, only the
VLAN ID, so only copy 2 byte, not 4. The target structure has padding
after the field, so copying 2 byte too many is effectively harmless.
There is no need to backport this patch.

Use RTE_PTR_ADD where copying arrays to the offset of a first field in a
structure holding multiple fields, to avoid compiler warnings with
decorated rte_memcpy.

Bugzilla ID: 1146

Fixes: 540a211084a7695a1c7bc43068934c140d6989be ("bnx2x: driver core")
Cc: stephen@networkplumber.org
Cc: rmody@marvell.com
Cc: shshaikh@marvell.com

Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
---
v7:
* No changes.
v6:
* Add Fixes to patch description.
* Fix checkpatch warnings.
v5:
* No changes.
v4:
* Type casting did not fix the warnings, so use RTE_PTR_ADD instead.
v3:
* First patch in series.
---
 drivers/net/bnx2x/bnx2x_stats.c | 11 +++++++----
 drivers/net/bnx2x/bnx2x_vfpf.c  |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bnx2x/bnx2x_stats.c b/drivers/net/bnx2x/bnx2x_stats.c
index c07b01510a..bc4a8b8e71 100644
--- a/drivers/net/bnx2x/bnx2x_stats.c
+++ b/drivers/net/bnx2x/bnx2x_stats.c
@@ -819,8 +819,9 @@ bnx2x_hw_stats_update(struct bnx2x_softc *sc)
 
     rte_memcpy(old, new, sizeof(struct nig_stats));
 
-    rte_memcpy(&(estats->rx_stat_ifhcinbadoctets_hi), &(pstats->mac_stx[1]),
-	   sizeof(struct mac_stx));
+	rte_memcpy(RTE_PTR_ADD(estats,
+			offsetof(struct bnx2x_eth_stats, rx_stat_ifhcinbadoctets_hi)),
+			&pstats->mac_stx[1], sizeof(struct mac_stx));
     estats->brb_drop_hi = pstats->brb_drop_hi;
     estats->brb_drop_lo = pstats->brb_drop_lo;
 
@@ -1492,9 +1493,11 @@ bnx2x_stats_init(struct bnx2x_softc *sc)
 		REG_RD(sc, NIG_REG_STAT0_BRB_TRUNCATE + port*0x38);
 	if (!CHIP_IS_E3(sc)) {
 		REG_RD_DMAE(sc, NIG_REG_STAT0_EGRESS_MAC_PKT0 + port*0x50,
-				&(sc->port.old_nig_stats.egress_mac_pkt0_lo), 2);
+				RTE_PTR_ADD(&sc->port.old_nig_stats,
+				offsetof(struct nig_stats, egress_mac_pkt0_lo)), 2);
 		REG_RD_DMAE(sc, NIG_REG_STAT0_EGRESS_MAC_PKT1 + port*0x50,
-				&(sc->port.old_nig_stats.egress_mac_pkt1_lo), 2);
+				RTE_PTR_ADD(&sc->port.old_nig_stats,
+				offsetof(struct nig_stats, egress_mac_pkt1_lo)), 2);
 	}
 
 	/* function stats */
diff --git a/drivers/net/bnx2x/bnx2x_vfpf.c b/drivers/net/bnx2x/bnx2x_vfpf.c
index 63953c2979..87631c76ca 100644
--- a/drivers/net/bnx2x/bnx2x_vfpf.c
+++ b/drivers/net/bnx2x/bnx2x_vfpf.c
@@ -54,7 +54,7 @@ bnx2x_check_bull(struct bnx2x_softc *sc)
 	if (valid_bitmap & (1 << MAC_ADDR_VALID) && memcmp(bull->mac, sc->old_bulletin.mac, ETH_ALEN))
 		rte_memcpy(&sc->link_params.mac_addr, bull->mac, ETH_ALEN);
 	if (valid_bitmap & (1 << VLAN_VALID))
-		rte_memcpy(&bull->vlan, &sc->old_bulletin.vlan, RTE_VLAN_HLEN);
+		rte_memcpy(&bull->vlan, &sc->old_bulletin.vlan, sizeof(bull->vlan));
 
 	sc->old_bulletin = *bull;
 
-- 
2.17.1