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| author | Richard Sailer <richard_siegfried@systemli.org> | 2020-07-20 18:06:14 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-22 17:00:37 -0700 |
| commit | 749c08f8206cdf5cad15d557912898ce22aa55da (patch) | |
| tree | 486c1cab8a10de9925fdb2d739ebb54c3f476646 | |
| parent | 09a0d326b977dbcae393d702a4dadd09fcbd06c7 (diff) | |
| download | linux-749c08f8206cdf5cad15d557912898ce22aa55da.tar.bz2 | |
net: dccp: Add SIOCOUTQ IOCTL support (send buffer fill)
This adds support for the SIOCOUTQ IOCTL to get the send buffer fill
of a DCCP socket, like UDP and TCP sockets already have.
Regarding the used data field: DCCP uses per packet sequence numbers,
not per byte, so sequence numbers can't be used like in TCP. sk_wmem_queued
is not used by DCCP and always 0, even in test on highly congested paths.
Therefore this uses sk_wmem_alloc like in UDP.
Signed-off-by: Richard Sailer <richard_siegfried@systemli.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | Documentation/networking/dccp.rst | 3 | ||||
| -rw-r--r-- | net/dccp/proto.c | 9 |
2 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/networking/dccp.rst b/Documentation/networking/dccp.rst index dde16be04456..91e5c33ba3ff 100644 --- a/Documentation/networking/dccp.rst +++ b/Documentation/networking/dccp.rst @@ -192,6 +192,9 @@ FIONREAD Works as in udp(7): returns in the ``int`` argument pointer the size of the next pending datagram in bytes, or 0 when no datagram is pending. +SIOCOUTQ + Returns the number of unsent data bytes in the socket send queue as ``int`` + into the buffer specified by the argument pointer. Other tunables ============== diff --git a/net/dccp/proto.c b/net/dccp/proto.c index fd92d3fe321f..9e453611107f 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -375,6 +375,15 @@ int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) goto out; switch (cmd) { + case SIOCOUTQ: { + int amount = sk_wmem_alloc_get(sk); + /* Using sk_wmem_alloc here because sk_wmem_queued is not used by DCCP and + * always 0, comparably to UDP. + */ + + rc = put_user(amount, (int __user *)arg); + } + break; case SIOCINQ: { struct sk_buff *skb; unsigned long amount = 0; |