[dpdk-stable] patch 'net/ixgbe: fix UDP zero checksum on x86' has been queued to stable release 20.11.1

[luca.boccassi@gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/14/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/6d465a7fc46e22375bb21138bb41035a15bbfad7

Thanks.

Luca Boccassi

---
From 6d465a7fc46e22375bb21138bb41035a15bbfad7 Mon Sep 17 00:00:00 2001
From: Haiyue Wang <haiyue.wang@intel.com>
Date: Thu, 4 Feb 2021 22:39:48 +0800
Subject: [PATCH] net/ixgbe: fix UDP zero checksum on x86

[ upstream commit 9a40edb599d76f7f9d116bb2f91b23c082b5f154 ]

There is an 82599 errata that UDP frames with a zero checksum are
incorrectly marked as checksum invalid by the hardware.  This was
leading to misleading PKT_RX_L4_CKSUM_BAD flag.

This patch changes the bad UDP checksum to PKT_RX_L4_CKSUM_UNKNOWN,
so the software application will then have to recompute the checksum
itself if needed.

Bugzilla ID: 629
Fixes: af75078fece3 ("first public release")

Reported-by: Paolo Valerio <pvalerio@redhat.com>
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Tested-by: Paolo Valerio <pvalerio@redhat.com>
---
 doc/guides/nics/ixgbe.rst              | 10 ++++++++
 drivers/net/ixgbe/ixgbe_rxtx.c         | 30 ++++++++++++++++++++----
 drivers/net/ixgbe/ixgbe_rxtx.h         |  2 ++
 drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 32 +++++++++++++++++++++++---
 4 files changed, 67 insertions(+), 7 deletions(-)

diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst
index c801dbae81..4f4d3b1c2c 100644
--- a/doc/guides/nics/ixgbe.rst
+++ b/doc/guides/nics/ixgbe.rst
@@ -252,6 +252,16 @@ Before binding ``vfio`` with legacy mode in X550 NICs, use ``modprobe vfio ``
 ``nointxmask=1`` to load ``vfio`` module if the intx is not shared with other
 devices.
 
+UDP with zero checksum is reported as error
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Intel 82599 10 Gigabit Ethernet Controller Specification Update (Revision 2.87)
+Errata: 44 Integrity Error Reported for IPv4/UDP Packets With Zero Checksum
+
+To support UDP zero checksum, the zero and bad UDP checksum packet is marked as
+PKT_RX_L4_CKSUM_UNKNOWN, so the application needs to recompute the checksum to
+validate it.
+
 Inline crypto processing support
 --------------------------------
 
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index f1fc307ffd..3b893b0df0 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -1441,7 +1441,8 @@ rx_desc_status_to_pkt_flags(uint32_t rx_status, uint64_t vlan_flags)
 }
 
 static inline uint64_t
-rx_desc_error_to_pkt_flags(uint32_t rx_status)
+rx_desc_error_to_pkt_flags(uint32_t rx_status, uint16_t pkt_info,
+			   uint8_t rx_udp_csum_zero_err)
 {
 	uint64_t pkt_flags;
 
@@ -1458,6 +1459,15 @@ rx_desc_error_to_pkt_flags(uint32_t rx_status)
 	pkt_flags = error_to_pkt_flags_map[(rx_status >>
 		IXGBE_RXDADV_ERR_CKSUM_BIT) & IXGBE_RXDADV_ERR_CKSUM_MSK];
 
+	/* Mask out the bad UDP checksum error if the hardware has UDP zero
+	 * checksum error issue, so that the software application will then
+	 * have to recompute the checksum itself if needed.
+	 */
+	if ((rx_status & IXGBE_RXDADV_ERR_TCPE) &&
+	    (pkt_info & IXGBE_RXDADV_PKTTYPE_UDP) &&
+	    rx_udp_csum_zero_err)
+		pkt_flags &= ~PKT_RX_L4_CKSUM_BAD;
+
 	if ((rx_status & IXGBE_RXD_STAT_OUTERIPCS) &&
 	    (rx_status & IXGBE_RXDADV_ERR_OUTERIPER)) {
 		pkt_flags |= PKT_RX_EIP_CKSUM_BAD;
@@ -1544,7 +1554,9 @@ ixgbe_rx_scan_hw_ring(struct ixgbe_rx_queue *rxq)
 			/* convert descriptor fields to rte mbuf flags */
 			pkt_flags = rx_desc_status_to_pkt_flags(s[j],
 				vlan_flags);
-			pkt_flags |= rx_desc_error_to_pkt_flags(s[j]);
+			pkt_flags |= rx_desc_error_to_pkt_flags(s[j],
+					(uint16_t)pkt_info[j],
+					rxq->rx_udp_csum_zero_err);
 			pkt_flags |= ixgbe_rxd_pkt_info_to_pkt_flags
 					((uint16_t)pkt_info[j]);
 			mb->ol_flags = pkt_flags;
@@ -1877,7 +1889,9 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		rxm->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);
 
 		pkt_flags = rx_desc_status_to_pkt_flags(staterr, vlan_flags);
-		pkt_flags = pkt_flags | rx_desc_error_to_pkt_flags(staterr);
+		pkt_flags = pkt_flags |
+			rx_desc_error_to_pkt_flags(staterr, (uint16_t)pkt_info,
+						   rxq->rx_udp_csum_zero_err);
 		pkt_flags = pkt_flags |
 			ixgbe_rxd_pkt_info_to_pkt_flags((uint16_t)pkt_info);
 		rxm->ol_flags = pkt_flags;
@@ -1970,7 +1984,8 @@ ixgbe_fill_cluster_head_buf(
 	head->vlan_tci = rte_le_to_cpu_16(desc->wb.upper.vlan);
 	pkt_info = rte_le_to_cpu_32(desc->wb.lower.lo_dword.data);
 	pkt_flags = rx_desc_status_to_pkt_flags(staterr, rxq->vlan_flags);
-	pkt_flags |= rx_desc_error_to_pkt_flags(staterr);
+	pkt_flags |= rx_desc_error_to_pkt_flags(staterr, (uint16_t)pkt_info,
+						rxq->rx_udp_csum_zero_err);
 	pkt_flags |= ixgbe_rxd_pkt_info_to_pkt_flags((uint16_t)pkt_info);
 	head->ol_flags = pkt_flags;
 	head->packet_type =
@@ -3091,6 +3106,13 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	else
 		rxq->pkt_type_mask = IXGBE_PACKET_TYPE_MASK_82599;
 
+	/*
+	 * 82599 errata, UDP frames with a 0 checksum can be marked as checksum
+	 * errors.
+	 */
+	if (hw->mac.type == ixgbe_mac_82599EB)
+		rxq->rx_udp_csum_zero_err = 1;
+
 	/*
 	 * Allocate RX ring hardware descriptors. A memzone large enough to
 	 * handle the maximum ring size is allocated in order to allow for
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.h b/drivers/net/ixgbe/ixgbe_rxtx.h
index 6d2f7c9da3..bcadaf79ce 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.h
+++ b/drivers/net/ixgbe/ixgbe_rxtx.h
@@ -129,6 +129,8 @@ struct ixgbe_rx_queue {
 	uint8_t             crc_len;  /**< 0 if CRC stripped, 4 otherwise. */
 	uint8_t             drop_en;  /**< If not 0, set SRRCTL.Drop_En. */
 	uint8_t             rx_deferred_start; /**< not in global dev start. */
+	/** UDP frames with a 0 checksum can be marked as checksum errors. */
+	uint8_t             rx_udp_csum_zero_err;
 	/** flags to set in mbuf when a vlan is detected. */
 	uint64_t            vlan_flags;
 	uint64_t	    offloads; /**< Rx offloads with DEV_RX_OFFLOAD_* */
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
index 90c076825a..52add17b5d 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
@@ -132,9 +132,9 @@ desc_to_olflags_v_ipsec(__m128i descs[4], struct rte_mbuf **rx_pkts)
 
 static inline void
 desc_to_olflags_v(__m128i descs[4], __m128i mbuf_init, uint8_t vlan_flags,
-	struct rte_mbuf **rx_pkts)
+		  uint16_t udp_p_flag, struct rte_mbuf **rx_pkts)
 {
-	__m128i ptype0, ptype1, vtag0, vtag1, csum;
+	__m128i ptype0, ptype1, vtag0, vtag1, csum, udp_csum_skip;
 	__m128i rearm0, rearm1, rearm2, rearm3;
 
 	/* mask everything except rss type */
@@ -161,6 +161,7 @@ desc_to_olflags_v(__m128i descs[4], __m128i mbuf_init, uint8_t vlan_flags,
 		(IXGBE_RXDADV_ERR_TCPE | IXGBE_RXDADV_ERR_IPE) >> 16,
 		IXGBE_RXD_STAT_VP, IXGBE_RXD_STAT_VP,
 		IXGBE_RXD_STAT_VP, IXGBE_RXD_STAT_VP);
+
 	/* map vlan present (0x8), IPE (0x2), L4E (0x1) to ol_flags */
 	const __m128i vlan_csum_map_lo = _mm_set_epi8(
 		0, 0, 0, 0,
@@ -182,12 +183,23 @@ desc_to_olflags_v(__m128i descs[4], __m128i mbuf_init, uint8_t vlan_flags,
 		0, PKT_RX_L4_CKSUM_GOOD >> sizeof(uint8_t), 0,
 		PKT_RX_L4_CKSUM_GOOD >> sizeof(uint8_t));
 
+	/* mask everything except UDP header present if specified */
+	const __m128i udp_hdr_p_msk = _mm_set_epi16
+		(0, 0, 0, 0,
+		 udp_p_flag, udp_p_flag, udp_p_flag, udp_p_flag);
+
+	const __m128i udp_csum_bad_shuf = _mm_set_epi8
+		(0, 0, 0, 0, 0, 0, 0, 0,
+		 0, 0, 0, 0, 0, 0, ~(uint8_t)PKT_RX_L4_CKSUM_BAD, 0xFF);
+
 	ptype0 = _mm_unpacklo_epi16(descs[0], descs[1]);
 	ptype1 = _mm_unpacklo_epi16(descs[2], descs[3]);
 	vtag0 = _mm_unpackhi_epi16(descs[0], descs[1]);
 	vtag1 = _mm_unpackhi_epi16(descs[2], descs[3]);
 
 	ptype0 = _mm_unpacklo_epi32(ptype0, ptype1);
+	/* save the UDP header present information */
+	udp_csum_skip = _mm_and_si128(ptype0, udp_hdr_p_msk);
 	ptype0 = _mm_and_si128(ptype0, rsstype_msk);
 	ptype0 = _mm_shuffle_epi8(rss_flags, ptype0);
 
@@ -215,6 +227,15 @@ desc_to_olflags_v(__m128i descs[4], __m128i mbuf_init, uint8_t vlan_flags,
 
 	vtag1 = _mm_or_si128(ptype0, vtag1);
 
+	/* convert the UDP header present 0x200 to 0x1 for aligning with each
+	 * PKT_RX_L4_CKSUM_BAD value in low byte of 16 bits word ol_flag in
+	 * vtag1 (4x16). Then mask out the bad checksum value by shuffle and
+	 * bit-mask.
+	 */
+	udp_csum_skip = _mm_srli_epi16(udp_csum_skip, 9);
+	udp_csum_skip = _mm_shuffle_epi8(udp_csum_bad_shuf, udp_csum_skip);
+	vtag1 = _mm_and_si128(vtag1, udp_csum_skip);
+
 	/*
 	 * At this point, we have the 4 sets of flags in the low 64-bits
 	 * of vtag1 (4x16).
@@ -341,6 +362,7 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	__m128i dd_check, eop_check;
 	__m128i mbuf_init;
 	uint8_t vlan_flags;
+	uint16_t udp_p_flag = 0; /* Rx Descriptor UDP header present */
 
 	/* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */
 	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_DESCS_PER_LOOP);
@@ -365,6 +387,9 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 				rte_cpu_to_le_32(IXGBE_RXDADV_STAT_DD)))
 		return 0;
 
+	if (rxq->rx_udp_csum_zero_err)
+		udp_p_flag = IXGBE_RXDADV_PKTTYPE_UDP;
+
 	/* 4 packets DD mask */
 	dd_check = _mm_set_epi64x(0x0000000100000001LL, 0x0000000100000001LL);
 
@@ -477,7 +502,8 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 		sterr_tmp1 = _mm_unpackhi_epi32(descs[1], descs[0]);
 
 		/* set ol_flags with vlan packet type */
-		desc_to_olflags_v(descs, mbuf_init, vlan_flags, &rx_pkts[pos]);
+		desc_to_olflags_v(descs, mbuf_init, vlan_flags, udp_p_flag,
+				  &rx_pkts[pos]);
 
 #ifdef RTE_LIB_SECURITY
 		if (unlikely(use_ipsec))
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-12 23:40:09.940486750 +0000
+++ 0002-net-ixgbe-fix-UDP-zero-checksum-on-x86.patch	2021-02-12 23:40:09.871090501 +0000
@@ -1 +1 @@
-From 9a40edb599d76f7f9d116bb2f91b23c082b5f154 Mon Sep 17 00:00:00 2001
+From 6d465a7fc46e22375bb21138bb41035a15bbfad7 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 9a40edb599d76f7f9d116bb2f91b23c082b5f154 ]
+
@@ -16 +17,0 @@
-Cc: stable@dpdk.org
@@ -30 +31 @@
-index 696cbd93ba..4c644c0e68 100644
+index c801dbae81..4f4d3b1c2c 100644
@@ -33,3 +34,3 @@
-@@ -257,6 +257,16 @@ RSS isn't supported when QinQ is enabled
- 
- Due to FW limitation, IXGBE doesn't support RSS when QinQ is enabled currently.
+@@ -252,6 +252,16 @@ Before binding ``vfio`` with legacy mode in X550 NICs, use ``modprobe vfio ``
+ ``nointxmask=1`` to load ``vfio`` module if the intx is not shared with other
+ devices.
@@ -51 +52 @@
-index 72d27f35ca..950b7894e0 100644
+index f1fc307ffd..3b893b0df0 100644
@@ -54 +55 @@
-@@ -1466,7 +1466,8 @@ rx_desc_status_to_pkt_flags(uint32_t rx_status, uint64_t vlan_flags)
+@@ -1441,7 +1441,8 @@ rx_desc_status_to_pkt_flags(uint32_t rx_status, uint64_t vlan_flags)
@@ -64 +65 @@
-@@ -1483,6 +1484,15 @@ rx_desc_error_to_pkt_flags(uint32_t rx_status)
+@@ -1458,6 +1459,15 @@ rx_desc_error_to_pkt_flags(uint32_t rx_status)
@@ -80 +81 @@
-@@ -1569,7 +1579,9 @@ ixgbe_rx_scan_hw_ring(struct ixgbe_rx_queue *rxq)
+@@ -1544,7 +1554,9 @@ ixgbe_rx_scan_hw_ring(struct ixgbe_rx_queue *rxq)
@@ -91 +92 @@
-@@ -1902,7 +1914,9 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+@@ -1877,7 +1889,9 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
@@ -102 +103 @@
-@@ -1995,7 +2009,8 @@ ixgbe_fill_cluster_head_buf(
+@@ -1970,7 +1984,8 @@ ixgbe_fill_cluster_head_buf(
@@ -112 +113 @@
-@@ -3116,6 +3131,13 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
+@@ -3091,6 +3106,13 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
@@ -127 +128 @@
-index 8a25e98df6..476ef62cfd 100644
+index 6d2f7c9da3..bcadaf79ce 100644
@@ -140 +141 @@
-index 9bbffe6119..7610fd93db 100644
+index 90c076825a..52add17b5d 100644