netdev - [PATCH net-next 2/4 v2] gianfar: Fix and cleanup rxbd status handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1436793726-13310-3-git-send-email-claudiu.manoil@freescale.com>
Date:	Mon, 13 Jul 2015 16:22:04 +0300
From:	Claudiu Manoil <claudiu.manoil@...escale.com>
To:	<netdev@...r.kernel.org>
CC:	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH net-next 2/4 v2] gianfar: Fix and cleanup rxbd status handling

There are several (long standing) problems about how the status
field of the rx buffer descriptor (rxbd) is currently handled on
the error path:
- too many unnecessary 16bit reads of the two halves of the rxbd
status field (32bit), also resulting in overuse of endianness
convesion macros;
- "bdp->status = RXBD_LARGE" makes no sense, since the "large"
flag is read only (only eTSEC can write it), and trying to clear
the other status bits is also error prone in this context
(most of the rx status bits are read only anyway).

This is fixed with a single 32bit read of the "status" field,
and then the appropriate 16bit shifting is applied to access
the various status bits or the rx frame length. Also corrected
the use of the RXBD_LARGE flag.

Additional fix:
"rx_over_errors" stat is incremented instead of "rx_crc_errors"
in case of RXBD_OVERRUN occurrence.

Signed-off-by: Claudiu Manoil <claudiu.manoil@...escale.com>
---
v2: lstatus is "u32", not "unsigned long"

 drivers/net/ethernet/freescale/gianfar.c | 34 +++++++++++++++++---------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index b35bf3d..c839e76 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2756,14 +2756,14 @@ static void gfar_alloc_rx_buffs(struct gfar_priv_rx_q *rx_queue,
 	rx_queue->next_to_use = i;
 }
 
-static inline void count_errors(unsigned short status, struct net_device *dev)
+static void count_errors(u32 lstatus, struct net_device *dev)
 {
 	struct gfar_private *priv = netdev_priv(dev);
 	struct net_device_stats *stats = &dev->stats;
 	struct gfar_extra_stats *estats = &priv->extra_stats;
 
 	/* If the packet was truncated, none of the other errors matter */
-	if (status & RXBD_TRUNCATED) {
+	if (lstatus & BD_LFLAG(RXBD_TRUNCATED)) {
 		stats->rx_length_errors++;
 
 		atomic64_inc(&estats->rx_trunc);
@@ -2771,25 +2771,25 @@ static inline void count_errors(unsigned short status, struct net_device *dev)
 		return;
 	}
 	/* Count the errors, if there were any */
-	if (status & (RXBD_LARGE | RXBD_SHORT)) {
+	if (lstatus & BD_LFLAG(RXBD_LARGE | RXBD_SHORT)) {
 		stats->rx_length_errors++;
 
-		if (status & RXBD_LARGE)
+		if (lstatus & BD_LFLAG(RXBD_LARGE))
 			atomic64_inc(&estats->rx_large);
 		else
 			atomic64_inc(&estats->rx_short);
 	}
-	if (status & RXBD_NONOCTET) {
+	if (lstatus & BD_LFLAG(RXBD_NONOCTET)) {
 		stats->rx_frame_errors++;
 		atomic64_inc(&estats->rx_nonoctet);
 	}
-	if (status & RXBD_CRCERR) {
+	if (lstatus & BD_LFLAG(RXBD_CRCERR)) {
 		atomic64_inc(&estats->rx_crcerr);
 		stats->rx_crc_errors++;
 	}
-	if (status & RXBD_OVERRUN) {
+	if (lstatus & BD_LFLAG(RXBD_OVERRUN)) {
 		atomic64_inc(&estats->rx_overrun);
-		stats->rx_crc_errors++;
+		stats->rx_over_errors++;
 	}
 }
 
@@ -2921,6 +2921,7 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
 	i = rx_queue->next_to_clean;
 
 	while (rx_work_limit--) {
+		u32 lstatus;
 
 		if (cleaned_cnt >= GFAR_RX_BUFF_ALLOC) {
 			gfar_alloc_rx_buffs(rx_queue, cleaned_cnt);
@@ -2928,7 +2929,8 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
 		}
 
 		bdp = &rx_queue->rx_bd_base[i];
-		if (be16_to_cpu(bdp->status) & RXBD_EMPTY)
+		lstatus = be32_to_cpu(bdp->lstatus);
+		if (lstatus & BD_LFLAG(RXBD_EMPTY))
 			break;
 
 		/* order rx buffer descriptor reads */
@@ -2940,13 +2942,13 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
 		dma_unmap_single(priv->dev, be32_to_cpu(bdp->bufPtr),
 				 priv->rx_buffer_size, DMA_FROM_DEVICE);
 
-		if (unlikely(!(be16_to_cpu(bdp->status) & RXBD_ERR) &&
-			     be16_to_cpu(bdp->length) > priv->rx_buffer_size))
-			bdp->status = cpu_to_be16(RXBD_LARGE);
+		if (unlikely(!(lstatus & BD_LFLAG(RXBD_ERR)) &&
+			     (lstatus & BD_LENGTH_MASK) > priv->rx_buffer_size))
+			lstatus |= BD_LFLAG(RXBD_LARGE);
 
-		if (unlikely(!(be16_to_cpu(bdp->status) & RXBD_LAST) ||
-			     be16_to_cpu(bdp->status) & RXBD_ERR)) {
-			count_errors(be16_to_cpu(bdp->status), dev);
+		if (unlikely(!(lstatus & BD_LFLAG(RXBD_LAST)) ||
+			     (lstatus & BD_LFLAG(RXBD_ERR)))) {
+			count_errors(lstatus, dev);
 
 			/* discard faulty buffer */
 			dev_kfree_skb(skb);
@@ -2957,7 +2959,7 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
 			howmany++;
 
 			if (likely(skb)) {
-				int pkt_len = be16_to_cpu(bdp->length) -
+				int pkt_len = (lstatus & BD_LENGTH_MASK) -
 					  ETH_FCS_LEN;
 				/* Remove the FCS from the packet length */
 				skb_put(skb, pkt_len);
-- 
1.7.11.7

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html