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[2/9] tg3: Prevent rx producer ring overruns

Message ID 1266022033-3546-3-git-send-email-mcarlson@broadcom.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Matt Carlson Feb. 13, 2010, 12:47 a.m. UTC 
When operating in RSS mode, it is possible for one rx return ring to
submit enough rx buffers back to the hardware such that it inadvertently
overwrites data needed by another rx return ring.  This patch addresses
the problem by looking for non-NULL skb pointers in the
rx_[std|jmb]_buffers rings that parallel the rx producer rings.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
---
 drivers/net/tg3.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 6874ce5..115fb7c 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4552,6 +4552,12 @@  static void tg3_recycle_rx(struct tg3_napi *tnapi,
 			   pci_unmap_addr(src_map, mapping));
 	dest_desc->addr_hi = src_desc->addr_hi;
 	dest_desc->addr_lo = src_desc->addr_lo;
+
+	/* Ensure that the update to the skb happens after the physical
+	 * addresses have been transferred to the new BD location.
+	 */
+	smp_wmb();
+
 	src_map->skb = NULL;
 }
 
@@ -4816,6 +4822,22 @@  static void tg3_rx_prodring_xfer(struct tg3 *tp,
 		si = spr->rx_std_cons_idx;
 		di = dpr->rx_std_prod_idx;
 
+		for (i = di; i < di + cpycnt; i++) {
+			if (dpr->rx_std_buffers[i].skb) {
+				cpycnt = i - di;
+				break;
+			}
+		}
+
+		if (!cpycnt)
+			break;
+
+		/* Ensure that updates to the rx_std_buffers ring and the
+		 * shadowed hardware producer ring from tg3_recycle_skb() are
+		 * ordered correctly WRT the skb check above.
+		 */
+		smp_rmb();
+
 		memcpy(&dpr->rx_std_buffers[di],
 		       &spr->rx_std_buffers[si],
 		       cpycnt * sizeof(struct ring_info));
@@ -4856,6 +4878,22 @@  static void tg3_rx_prodring_xfer(struct tg3 *tp,
 		si = spr->rx_jmb_cons_idx;
 		di = dpr->rx_jmb_prod_idx;
 
+		for (i = di; i < di + cpycnt; i++) {
+			if (dpr->rx_jmb_buffers[i].skb) {
+				cpycnt = i - di;
+				break;
+			}
+		}
+
+		if (!cpycnt)
+			break;
+
+		/* Ensure that updates to the rx_jmb_buffers ring and the
+		 * shadowed hardware producer ring from tg3_recycle_skb() are
+		 * ordered correctly WRT the skb check above.
+		 */
+		smp_rmb();
+
 		memcpy(&dpr->rx_jmb_buffers[di],
 		       &spr->rx_jmb_buffers[si],
 		       cpycnt * sizeof(struct ring_info));