net/ena: validate Rx req ID upon acquiring descriptor

[ upstream commit 05cffdc ]

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: 2061fe4 ("net/ena: linearize Tx mbuf")

Signed-off-by: Ido Segev <idose@amazon.com>
Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Igor Chauskin <igorch@amazon.com>

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;

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
 

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;
 		}