[dpdk-stable] patch 'net/ena: validate Rx req ID upon acquiring descriptor' has been queued to stable release 20.11.1

[luca.boccassi at 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 02/07/21. 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/97e85ace6bb679f54e034aef92099ac21501467f

Thanks.

Luca Boccassi

---
>From 97e85ace6bb679f54e034aef92099ac21501467f Mon Sep 17 00:00:00 2001
From: Michal Krawczyk <mk at semihalf.com>
Date: Tue, 26 Jan 2021 19:32:24 +0100
Subject: [PATCH] net/ena: validate Rx req ID upon acquiring descriptor

[ upstream commit 05cffdcfa0f1940e0b2c5495aa7194c474cfe197 ]

Instead of verifying the Rx descriptor each time it's being used in the
driver code, now the verification happens on the HAL side.

This simplifies code a lot as instead of doing 2 validations, only
single one is needed. The driver have to check the rc value returned
by the ena_com upon reading the Rx descriptor and trigger the reset
if needed. It was previously the responsibility of the
validate_rx_req_id() function.

As part of the change, the version of the driver was bumped to v2.2.1.

Fixes: 2061fe41f212 ("net/ena: linearize Tx mbuf")

Signed-off-by: Ido Segev <idose at amazon.com>
Signed-off-by: Michal Krawczyk <mk at semihalf.com>
Reviewed-by: Igor Chauskin <igorch at amazon.com>
---
 drivers/net/ena/base/ena_eth_com.c   |  3 +++
 drivers/net/ena/base/ena_plat_dpdk.h |  1 +
 drivers/net/ena/ena_ethdev.c         | 38 ++++++++--------------------
 3 files changed, 14 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ena/base/ena_eth_com.c b/drivers/net/ena/base/ena_eth_com.c
index a35d92fbd3..5583a310a1 100644
--- a/drivers/net/ena/base/ena_eth_com.c
+++ b/drivers/net/ena/base/ena_eth_com.c
@@ -531,6 +531,7 @@ int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
 {
 	struct ena_com_rx_buf_info *ena_buf = &ena_rx_ctx->ena_bufs[0];
 	struct ena_eth_io_rx_cdesc_base *cdesc = NULL;
+	u16 q_depth = io_cq->q_depth;
 	u16 cdesc_idx = 0;
 	u16 nb_hw_desc;
 	u16 i = 0;
@@ -559,6 +560,8 @@ int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
 	do {
 		ena_buf[i].len = cdesc->length;
 		ena_buf[i].req_id = cdesc->req_id;
+		if (unlikely(ena_buf[i].req_id >= q_depth))
+			return ENA_COM_EIO;
 
 		if (++i >= nb_hw_desc)
 			break;
diff --git a/drivers/net/ena/base/ena_plat_dpdk.h b/drivers/net/ena/base/ena_plat_dpdk.h
index 48c77f0c19..a1d749f83f 100644
--- a/drivers/net/ena/base/ena_plat_dpdk.h
+++ b/drivers/net/ena/base/ena_plat_dpdk.h
@@ -51,6 +51,7 @@ typedef uint64_t dma_addr_t;
 #define ENA_COM_FAULT	-EFAULT
 #define ENA_COM_TRY_AGAIN	-EAGAIN
 #define ENA_COM_UNSUPPORTED    -EOPNOTSUPP
+#define ENA_COM_EIO    -EIO
 
 #define ____cacheline_aligned __rte_cache_aligned
 
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 111e830bfa..9ee9de6eb9 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -28,7 +28,7 @@
 
 #define DRV_MODULE_VER_MAJOR	2
 #define DRV_MODULE_VER_MINOR	2
-#define DRV_MODULE_VER_SUBMINOR	0
+#define DRV_MODULE_VER_SUBMINOR	1
 
 #define ENA_IO_TXQ_IDX(q)	(2 * (q))
 #define ENA_IO_RXQ_IDX(q)	(2 * (q) + 1)
@@ -380,20 +380,6 @@ static inline void ena_tx_mbuf_prepare(struct rte_mbuf *mbuf,
 	}
 }
 
-static inline int validate_rx_req_id(struct ena_ring *rx_ring, uint16_t req_id)
-{
-	if (likely(req_id < rx_ring->ring_size))
-		return 0;
-
-	PMD_DRV_LOG(ERR, "Invalid rx req_id: %hu\n", req_id);
-
-	rx_ring->adapter->reset_reason = ENA_REGS_RESET_INV_RX_REQ_ID;
-	rx_ring->adapter->trigger_reset = true;
-	++rx_ring->rx_stats.bad_req_id;
-
-	return -EFAULT;
-}
-
 static int validate_tx_req_id(struct ena_ring *tx_ring, u16 req_id)
 {
 	struct ena_tx_buffer *tx_info = NULL;
@@ -1486,10 +1472,6 @@ static int ena_populate_rx_queue(struct ena_ring *rxq, unsigned int count)
 			rte_prefetch0(mbufs[i + 4]);
 
 		req_id = rxq->empty_rx_reqs[next_to_use];
-		rc = validate_rx_req_id(rxq, req_id);
-		if (unlikely(rc))
-			break;
-
 		rx_info = &rxq->rx_buffer_info[req_id];
 
 		rc = ena_add_single_rx_desc(rxq->ena_com_io_sq, mbuf, req_id);
@@ -2114,8 +2096,6 @@ static struct rte_mbuf *ena_rx_mbuf(struct ena_ring *rx_ring,
 
 	len = ena_bufs[buf].len;
 	req_id = ena_bufs[buf].req_id;
-	if (unlikely(validate_rx_req_id(rx_ring, req_id)))
-		return NULL;
 
 	rx_info = &rx_ring->rx_buffer_info[req_id];
 
@@ -2139,10 +2119,6 @@ static struct rte_mbuf *ena_rx_mbuf(struct ena_ring *rx_ring,
 		++buf;
 		len = ena_bufs[buf].len;
 		req_id = ena_bufs[buf].req_id;
-		if (unlikely(validate_rx_req_id(rx_ring, req_id))) {
-			rte_mbuf_raw_free(mbuf_head);
-			return NULL;
-		}
 
 		rx_info = &rx_ring->rx_buffer_info[req_id];
 		RTE_ASSERT(rx_info->mbuf != NULL);
@@ -2230,10 +2206,16 @@ static uint16_t eth_ena_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 				    &ena_rx_ctx);
 		if (unlikely(rc)) {
 			PMD_DRV_LOG(ERR, "ena_com_rx_pkt error %d\n", rc);
-			rx_ring->adapter->reset_reason =
-				ENA_REGS_RESET_TOO_MANY_RX_DESCS;
+			if (rc == ENA_COM_NO_SPACE) {
+				++rx_ring->rx_stats.bad_desc_num;
+				rx_ring->adapter->reset_reason =
+					ENA_REGS_RESET_TOO_MANY_RX_DESCS;
+			} else {
+				++rx_ring->rx_stats.bad_req_id;
+				rx_ring->adapter->reset_reason =
+					ENA_REGS_RESET_INV_RX_REQ_ID;
+			}
 			rx_ring->adapter->trigger_reset = true;
-			++rx_ring->rx_stats.bad_desc_num;
 			return 0;
 		}
 
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:41.095524635 +0000
+++ 0270-net-ena-validate-Rx-req-ID-upon-acquiring-descriptor.patch	2021-02-05 11:18:29.354701545 +0000
@@ -1 +1 @@
-From 05cffdcfa0f1940e0b2c5495aa7194c474cfe197 Mon Sep 17 00:00:00 2001
+From 97e85ace6bb679f54e034aef92099ac21501467f Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 05cffdcfa0f1940e0b2c5495aa7194c474cfe197 ]
+
@@ -18 +19,0 @@
-Cc: stable at dpdk.org
@@ -63 +64 @@
-index 623b6dd2a0..1728ceb9a8 100644
+index 111e830bfa..9ee9de6eb9 100644