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migration/rdma: fix return value for qio_channel_rdma_{readv,writev} 

upon errors. As the documentation in include/io/channel.h states, only
-1 and QIO_CHANNEL_ERR_BLOCK should be returned upon error. Other
values have the potential to confuse the call sites.

error_setg is used rather than error_setg_errno, because there are
certain code paths where -1 (as a non-errno) is propagated up (e.g.
starting from qemu_rdma_block_for_wrid or qemu_rdma_post_recv_control)
all the way to qio_channel_rdma_{readv,writev}.

Similar to a216ec85b7 ("migration/channel-block: fix return value for
qio_channel_block_{readv,writev}").

Suggested-by: Zhang Chen <chen.zhang@intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Fiona Ebner 2022-12-09 14:15:24 +01:00 committed by Juan Quintela
parent db18dee7d7
commit 74ecf6ac2b
1 changed files with 10 additions and 5 deletions
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15
migration/rdma.c
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@ -2785,7 +2785,8 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
rdma = qatomic_rcu_read(&rioc->rdmaout);
if (!rdma) {
return -EIO;
error_setg(errp, "RDMA control channel output is not set");
return -1;
}
CHECK_ERROR_STATE();
@ -2797,7 +2798,8 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
ret = qemu_rdma_write_flush(f, rdma);
if (ret < 0) {
rdma->error_state = ret;
return ret;
error_setg(errp, "qemu_rdma_write_flush returned %d", ret);
return -1;
}
for (i = 0; i < niov; i++) {
@ -2816,7 +2818,8 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
if (ret < 0) {
rdma->error_state = ret;
return ret;
error_setg(errp, "qemu_rdma_exchange_send returned %d", ret);
return -1;
}
data += len;
@ -2867,7 +2870,8 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc,
rdma = qatomic_rcu_read(&rioc->rdmain);
if (!rdma) {
return -EIO;
error_setg(errp, "RDMA control channel input is not set");
return -1;
}
CHECK_ERROR_STATE();
@ -2903,7 +2907,8 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc,
if (ret < 0) {
rdma->error_state = ret;
return ret;
error_setg(errp, "qemu_rdma_exchange_recv returned %d", ret);
return -1;
}
/*