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| author |   Stanislav Fomichev <stfomichev@gmail.com> | 2025-05-20 13:30:42 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2025-05-26 10:00:48 +0100 |
| commit | 384492c48e6a88c9a7f0376d8e8ac7f557988e92 (patch) | |
| tree | 95547cd8576faaa0b3228588c91fb4d24c35278e | |
| parent | net: ethernet: mtk_eth_soc: Correct spelling (diff) | |
| download | wireguard-linux-384492c48e6a88c9a7f0376d8e8ac7f557988e92.tar.xz wireguard-linux-384492c48e6a88c9a7f0376d8e8ac7f557988e92.zip | |
net: devmem: support single IOV with sendmsg
sendmsg() with a single iov becomes ITER_UBUF, sendmsg() with multiple
iovs becomes ITER_IOVEC. iter_iov_len does not return correct
value for UBUF, so teach to treat UBUF differently.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Mina Almasry <almasrymina@google.com>
Fixes: bd61848900bf ("net: devmem: Implement TX path")
Signed-off-by: Stanislav Fomichev <stfomichev@gmail.com>
Acked-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/uio.h | 8 | ||||
| -rw-r--r-- | net/core/datagram.c | 3 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h index 49ece9e1888f..393d0622cc28 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -99,7 +99,13 @@ static inline const struct iovec *iter_iov(const struct iov_iter *iter) } #define iter_iov_addr(iter) (iter_iov(iter)->iov_base + (iter)->iov_offset) -#define iter_iov_len(iter) (iter_iov(iter)->iov_len - (iter)->iov_offset) + +static inline size_t iter_iov_len(const struct iov_iter *i) +{ + if (i->iter_type == ITER_UBUF) + return i->count; + return iter_iov(i)->iov_len - i->iov_offset; +} static inline enum iter_type iov_iter_type(const struct iov_iter *i) { diff --git a/net/core/datagram.c b/net/core/datagram.c index b352a1009304..94cc4705e91d 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -702,7 +702,8 @@ zerocopy_fill_skb_from_devmem(struct sk_buff *skb, struct iov_iter *from, * iov_addrs are interpreted as an offset in bytes into the dma-buf to * send from. We do not support other iter types. */ - if (iov_iter_type(from) != ITER_IOVEC) + if (iov_iter_type(from) != ITER_IOVEC && + iov_iter_type(from) != ITER_UBUF) return -EFAULT; while (length && iov_iter_count(from)) { |