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| author | Liang Chen <liangchen.linux@gmail.com> | 2023-09-20 14:56:58 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-09-28 16:25:14 +0200 |
| commit | 7c7dd1d64910d07ab36b858d53d00e89b6d918d6 (patch) | |
| tree | 069b782cd2793874fb8c7676a8c59796d7a4c165 /Documentation/networking | |
| parent | pktgen: Automate flag enumeration for unknown flag handling (diff) | |
| download | linux-7c7dd1d64910d07ab36b858d53d00e89b6d918d6.tar.xz linux-7c7dd1d64910d07ab36b858d53d00e89b6d918d6.zip | |
pktgen: Introducing 'SHARED' flag for testing with non-shared skb
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 <liangchen.linux@gmail.com>
Reviewed-by: Benjamin Poirier <bpoirier@nvidia.com>
Link: https://lore.kernel.org/r/20230920125658.46978-2-liangchen.linux@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/pktgen.rst | 12 |
1 files changed, 12 insertions, 0 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) |