patches for DPDK stable branches
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* [dpdk-stable] [PATCH] net/octeontx2: fix corruption in segments list
@ 2020-12-21 14:03 skori
  2020-12-28 12:17 ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
  0 siblings, 1 reply; 3+ messages in thread
From: skori @ 2020-12-21 14:03 UTC (permalink / raw)
  To: Jerin Jacob, Nithin Dabilpuram, Kiran Kumar K
  Cc: dev, Sunil Kumar Kori, stable

From: Sunil Kumar Kori <skori@marvell.com>

On Tx, lastseg->next is not being reset to null for multi segmented packet
and same mbuf can be used on Rx which has a stale mbuf entry into
mbuf->next.

On Rx, application receives mbuf with mbuf->next uninitialized though
mbuf->nb_segs is correct. Application iterates over all segments using
mbuf->next ignoring mbuf->nb_segs which leads to undefined behavior.

So earlier assumption of just having right value in mbuf->nb_segs is
enough, is incorrect. Mbuf must contain valid and synced value in
nb_segs and next pointer.

Fixes: 364eb0e46683 ("net/octeontx2: avoid per packet barrier with multi segment")
Cc: stable@dpdk.org

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
---
 drivers/net/octeontx2/otx2_rx.c | 6 ++++++
 drivers/net/octeontx2/otx2_rx.h | 7 +++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/octeontx2/otx2_rx.c b/drivers/net/octeontx2/otx2_rx.c
index 2da8efe77..ffeade595 100644
--- a/drivers/net/octeontx2/otx2_rx.c
+++ b/drivers/net/octeontx2/otx2_rx.c
@@ -279,6 +279,12 @@ nix_recv_pkts_vector(void *rx_queue, struct rte_mbuf **rx_pkts,
 		vst1q_u64((uint64_t *)mbuf2->rearm_data, rearm2);
 		vst1q_u64((uint64_t *)mbuf3->rearm_data, rearm3);
 
+		/* Update that no more segments */
+		mbuf0->next = NULL;
+		mbuf1->next = NULL;
+		mbuf2->next = NULL;
+		mbuf3->next = NULL;
+
 		/* Store the mbufs to rx_pkts */
 		vst1q_u64((uint64_t *)&rx_pkts[packets], mbuf01);
 		vst1q_u64((uint64_t *)&rx_pkts[packets + 2], mbuf23);
diff --git a/drivers/net/octeontx2/otx2_rx.h b/drivers/net/octeontx2/otx2_rx.h
index 926f614a4..0ba3d3d96 100644
--- a/drivers/net/octeontx2/otx2_rx.h
+++ b/drivers/net/octeontx2/otx2_rx.h
@@ -215,6 +215,7 @@ nix_cqe_xtract_mseg(const struct nix_rx_parse_s *rx,
 			iova_list = (const rte_iova_t *)(iova_list + 1);
 		}
 	}
+	mbuf->next = NULL;
 }
 
 static __rte_always_inline uint16_t
@@ -330,10 +331,12 @@ otx2_nix_cqe_to_mbuf(const struct nix_cqe_hdr_s *cq, const uint32_t tag,
 	*(uint64_t *)(&mbuf->rearm_data) = val;
 	mbuf->pkt_len = len;
 
-	if (flag & NIX_RX_MULTI_SEG_F)
+	if (flag & NIX_RX_MULTI_SEG_F) {
 		nix_cqe_xtract_mseg(rx, mbuf, val);
-	else
+	} else {
 		mbuf->data_len = len;
+		mbuf->next = NULL;
+	}
 }
 
 #define CKSUM_F NIX_RX_OFFLOAD_CHECKSUM_F
-- 
2.25.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-01-12 18:14 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-21 14:03 [dpdk-stable] [PATCH] net/octeontx2: fix corruption in segments list skori
2020-12-28 12:17 ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
2021-01-12 18:13   ` Jerin Jacob

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