Subject: [PATCH net-next v4 2/2] pktgen: Introducing 'SHARED' flag for testing with non-shared skb

From: Liang Chen <[email-masked]>
Date: Sat, 16 Sep 2023 21:29:32 +0800

Currently, skbs generated by pktgen always have their reference count
incremented before transmission, causing their reference count to be
always greater than 1, leading to two issues:
  1. Only the code paths for shared skbs can be tested.
  2. In certain situations, skbs can only be released by pktgen.
To enhance testing comprehensiveness, we are introducing the "SHARED"
flag to indicate whether an SKB is shared. This flag is enabled by
default, aligning with the current behavior. However, disabling this
flag allows skbs with a reference count of 1 to be transmitted.
So we can test non-shared skbs and code paths where skbs are released
within the stack.

Signed-off-by: Liang Chen <[email-masked]>
---
 Documentation/networking/pktgen.rst | 12 ++++++++
 net/core/pktgen.c                   | 48 ++++++++++++++++++++++++-----
 2 files changed, 52 insertions(+), 8 deletions(-)

diff --git a/Documentation/networking/pktgen.rst b/Documentation/networking/pktgen.rst
index 1225f0f63ff0..c945218946e1 100644
--- a/Documentation/networking/pktgen.rst
+++ b/Documentation/networking/pktgen.rst
@@ -178,6 +178,7 @@ Examples::
 			      IPSEC # IPsec encapsulation (needs CONFIG_XFRM)
 			      NODE_ALLOC # node specific memory allocation
 			      NO_TIMESTAMP # disable timestamping
+			      SHARED # enable shared SKB
  pgset 'flag ![name]'    Clear a flag to determine behaviour.
 			 Note that you might need to use single quote in
 			 interactive mode, so that your shell wouldn't expand
@@ -288,6 +289,16 @@ To avoid breaking existing testbed scripts for using AH type and tunnel mode,
 you can use "pgset spi SPI_VALUE" to specify which transformation mode
 to employ.
 
+Disable shared SKB
+==================
+By default, SKBs sent by pktgen are shared (user count > 1).
+To test with non-shared SKBs, remove the "SHARED" flag by simply setting::
+
+	pg_set "flag !SHARED"
+
+However, if the "clone_skb" or "burst" parameters are configured, the skb
+still needs to be held by pktgen for further access. Hence the skb must be
+shared.
 
 Current commands and configuration options
 ==========================================
@@ -357,6 +368,7 @@ Current commands and configuration options
     IPSEC
     NODE_ALLOC
     NO_TIMESTAMP
+    SHARED
 
     spi (ipsec)
 
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 48306a101fd9..c4e0814df325 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -200,6 +200,7 @@
 	pf(VID_RND)		/* Random VLAN ID */			\
 	pf(SVID_RND)		/* Random SVLAN ID */			\
 	pf(NODE)		/* Node memory alloc*/			\
+	pf(SHARED)		/* Shared SKB */			\
 
 #define pf(flag)		flag##_SHIFT,
 enum pkt_flags {
@@ -1198,7 +1199,8 @@ static ssize_t pktgen_if_write(struct file *file,
 		    ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
 		     !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
 			return -ENOTSUPP;
-		if (value > 0 && pkt_dev->n_imix_entries > 0)
+		if (value > 0 && (pkt_dev->n_imix_entries > 0 ||
+				  !(pkt_dev->flags & F_SHARED)))
 			return -EINVAL;
 
 		i += len;
@@ -1257,6 +1259,10 @@ static ssize_t pktgen_if_write(struct file *file,
 		     ((pkt_dev->xmit_mode == M_START_XMIT) &&
 		     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
 			return -ENOTSUPP;
+
+		if (value > 1 && !(pkt_dev->flags & F_SHARED))
+			return -EINVAL;
+
 		pkt_dev->burst = value < 1 ? 1 : value;
 		sprintf(pg_result, "OK: burst=%u", pkt_dev->burst);
 		return count;
@@ -1334,10 +1340,19 @@ static ssize_t pktgen_if_write(struct file *file,
 
 		flag = pktgen_read_flag(f, &disable);
 		if (flag) {
-			if (disable)
+			if (disable) {
+				/* If "clone_skb", or "burst" parameters are
+				 * configured, it means that the skb still
+				 * needs to be referenced by the pktgen, so
+				 * the skb must be shared.
+				 */
+				if (flag == F_SHARED && (pkt_dev->clone_skb ||
+							 pkt_dev->burst > 1))
+					return -EINVAL;
 				pkt_dev->flags &= ~flag;
-			else
+			} else {
 				pkt_dev->flags |= flag;
+			}
 
 			sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
 			return count;
@@ -3489,7 +3504,8 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 	if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
 		skb = pkt_dev->skb;
 		skb->protocol = eth_type_trans(skb, skb->dev);
-		refcount_add(burst, &skb->users);
+		if (pkt_dev->flags & F_SHARED)
+			refcount_add(burst, &skb->users);
 		local_bh_disable();
 		do {
 			ret = netif_receive_skb(skb);
@@ -3497,6 +3513,10 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 				pkt_dev->errors++;
 			pkt_dev->sofar++;
 			pkt_dev->seq_num++;
+			if (unlikely(!(pkt_dev->flags & F_SHARED))) {
+				pkt_dev->skb = NULL;
+				break;
+			}
 			if (refcount_read(&skb->users) != burst) {
 				/* skb was queued by rps/rfs or taps,
 				 * so cannot reuse this skb
@@ -3515,9 +3535,14 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 		goto out; /* Skips xmit_mode M_START_XMIT */
 	} else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
 		local_bh_disable();
-		refcount_inc(&pkt_dev->skb->users);
+		if (pkt_dev->flags & F_SHARED)
+			refcount_inc(&pkt_dev->skb->users);
 
 		ret = dev_queue_xmit(pkt_dev->skb);
+
+		if (!(pkt_dev->flags & F_SHARED) && dev_xmit_complete(ret))
+			pkt_dev->skb = NULL;
+
 		switch (ret) {
 		case NET_XMIT_SUCCESS:
 			pkt_dev->sofar++;
@@ -3555,11 +3580,15 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 		pkt_dev->last_ok = 0;
 		goto unlock;
 	}
-	refcount_add(burst, &pkt_dev->skb->users);
+	if (pkt_dev->flags & F_SHARED)
+		refcount_add(burst, &pkt_dev->skb->users);
 
 xmit_more:
 	ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
 
+	if (!(pkt_dev->flags & F_SHARED) && dev_xmit_complete(ret))
+		pkt_dev->skb = NULL;
+
 	switch (ret) {
 	case NETDEV_TX_OK:
 		pkt_dev->last_ok = 1;
@@ -3581,7 +3610,8 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 		fallthrough;
 	case NETDEV_TX_BUSY:
 		/* Retry it next time */
-		refcount_dec(&(pkt_dev->skb->users));
+		if (pkt_dev->flags & F_SHARED)
+			refcount_dec(&pkt_dev->skb->users);
 		pkt_dev->last_ok = 0;
 	}
 	if (unlikely(burst))
@@ -3594,7 +3624,8 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 
 	/* If pkt_dev->count is zero, then run forever */
 	if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
-		pktgen_wait_for_skb(pkt_dev);
+		if (pkt_dev->skb)
+			pktgen_wait_for_skb(pkt_dev);
 
 		/* Done with this */
 		pktgen_stop_device(pkt_dev);
@@ -3777,6 +3808,7 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
 	pkt_dev->svlan_id = 0xffff;
 	pkt_dev->burst = 1;
 	pkt_dev->node = NUMA_NO_NODE;
+	pkt_dev->flags = F_SHARED;	/* SKB shared by default */
 
 	err = pktgen_setup_dev(t->net, pkt_dev, ifname);
 	if (err)
-- 
2.40.1