| Message ID | 20201204170235.84387-5-andraprs@amazon.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | vsock: Add flags field in the vsock address | expand |
On Fri, Dec 04, 2020 at 07:02:35PM +0200, Andra Paraschiv wrote: >The vsock flags field can be set in the connect and (listen) receive >paths. > >When the vsock transport is assigned, the remote CID is used to >distinguish between types of connection. > >Use the vsock flags value (in addition to the CID) from the remote >address to decide which vsock transport to assign. For the sibling VMs >use case, all the vsock packets need to be forwarded to the host, so >always assign the guest->host transport if the VMADDR_FLAG_TO_HOST flag >is set. For the other use cases, the vsock transport assignment logic is >not changed. > >Changelog > >v1 -> v2 > >* Use bitwise operator to check the vsock flag. >* Use the updated "VMADDR_FLAG_TO_HOST" flag naming. >* Merge the checks for the g2h transport assignment in one "if" block. > >Signed-off-by: Andra Paraschiv <andraprs@amazon.com> >--- > net/vmw_vsock/af_vsock.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > >diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c >index 83d035eab0b05..66e643c3b5f85 100644 >--- a/net/vmw_vsock/af_vsock.c >+++ b/net/vmw_vsock/af_vsock.c >@@ -421,7 +421,8 @@ static void vsock_deassign_transport(struct vsock_sock *vsk) > * The vsk->remote_addr is used to decide which transport to use: > * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if > * g2h is not loaded, will use local transport; >- * - remote CID <= VMADDR_CID_HOST will use guest->host transport; >+ * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field >+ * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; > * - remote CID > VMADDR_CID_HOST will use host->guest transport; > */ > int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) >@@ -429,6 +430,7 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) > const struct vsock_transport *new_transport; > struct sock *sk = sk_vsock(vsk); > unsigned int remote_cid = vsk->remote_addr.svm_cid; >+ unsigned short remote_flags; > int ret; > > /* If the packet is coming with the source and destination CIDs higher >@@ -443,6 +445,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) > vsk->remote_addr.svm_cid > VMADDR_CID_HOST) > vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; > >+ remote_flags = vsk->remote_addr.svm_flags; >+ > switch (sk->sk_type) { > case SOCK_DGRAM: > new_transport = transport_dgram; >@@ -450,7 +454,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) > case SOCK_STREAM: > if (vsock_use_local_transport(remote_cid)) > new_transport = transport_local; >- else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g) >+ else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || >+ (remote_flags & VMADDR_FLAG_TO_HOST) == VMADDR_FLAG_TO_HOST) Maybe "remote_flags & VMADDR_FLAG_TO_HOST" should be enough, but the patch is okay: Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> > new_transport = transport_g2h; > else > new_transport = transport_h2g; >-- >2.20.1 (Apple Git-117) > > > > >Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005. >
On 07/12/2020 12:00, Stefano Garzarella wrote: > > On Fri, Dec 04, 2020 at 07:02:35PM +0200, Andra Paraschiv wrote: >> The vsock flags field can be set in the connect and (listen) receive >> paths. >> >> When the vsock transport is assigned, the remote CID is used to >> distinguish between types of connection. >> >> Use the vsock flags value (in addition to the CID) from the remote >> address to decide which vsock transport to assign. For the sibling VMs >> use case, all the vsock packets need to be forwarded to the host, so >> always assign the guest->host transport if the VMADDR_FLAG_TO_HOST flag >> is set. For the other use cases, the vsock transport assignment logic is >> not changed. >> >> Changelog >> >> v1 -> v2 >> >> * Use bitwise operator to check the vsock flag. >> * Use the updated "VMADDR_FLAG_TO_HOST" flag naming. >> * Merge the checks for the g2h transport assignment in one "if" block. >> >> Signed-off-by: Andra Paraschiv <andraprs@amazon.com> >> --- >> net/vmw_vsock/af_vsock.c | 9 +++++++-- >> 1 file changed, 7 insertions(+), 2 deletions(-) >> >> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c >> index 83d035eab0b05..66e643c3b5f85 100644 >> --- a/net/vmw_vsock/af_vsock.c >> +++ b/net/vmw_vsock/af_vsock.c >> @@ -421,7 +421,8 @@ static void vsock_deassign_transport(struct >> vsock_sock *vsk) >> * The vsk->remote_addr is used to decide which transport to use: >> * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or >> VMADDR_CID_HOST if >> * g2h is not loaded, will use local transport; >> - * - remote CID <= VMADDR_CID_HOST will use guest->host transport; >> + * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote >> flags field >> + * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host >> transport; >> * - remote CID > VMADDR_CID_HOST will use host->guest transport; >> */ >> int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock >> *psk) >> @@ -429,6 +430,7 @@ int vsock_assign_transport(struct vsock_sock >> *vsk, struct vsock_sock *psk) >> const struct vsock_transport *new_transport; >> struct sock *sk = sk_vsock(vsk); >> unsigned int remote_cid = vsk->remote_addr.svm_cid; >> + unsigned short remote_flags; >> int ret; >> >> /* If the packet is coming with the source and destination CIDs >> higher >> @@ -443,6 +445,8 @@ int vsock_assign_transport(struct vsock_sock >> *vsk, struct vsock_sock *psk) >> vsk->remote_addr.svm_cid > VMADDR_CID_HOST) >> vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; >> >> + remote_flags = vsk->remote_addr.svm_flags; >> + >> switch (sk->sk_type) { >> case SOCK_DGRAM: >> new_transport = transport_dgram; >> @@ -450,7 +454,8 @@ int vsock_assign_transport(struct vsock_sock >> *vsk, struct vsock_sock *psk) >> case SOCK_STREAM: >> if (vsock_use_local_transport(remote_cid)) >> new_transport = transport_local; >> - else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g) >> + else if (remote_cid <= VMADDR_CID_HOST || >> !transport_h2g || >> + (remote_flags & VMADDR_FLAG_TO_HOST) == >> VMADDR_FLAG_TO_HOST) > > Maybe "remote_flags & VMADDR_FLAG_TO_HOST" should be enough, but the > patch is okay: > > Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Done, updated to have only the bitwise logic, without the comparison. Thanks, Andra > >> new_transport = transport_g2h; >> else >> new_transport = transport_h2g; >> -- >> 2.20.1 (Apple Git-117) >> >> >> >> >> Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. >> Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. >> Registered in Romania. Registration number J22/2621/2005. >> > Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 83d035eab0b05..66e643c3b5f85 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -421,7 +421,8 @@ static void vsock_deassign_transport(struct vsock_sock *vsk) * The vsk->remote_addr is used to decide which transport to use: * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if * g2h is not loaded, will use local transport; - * - remote CID <= VMADDR_CID_HOST will use guest->host transport; + * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field + * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; * - remote CID > VMADDR_CID_HOST will use host->guest transport; */ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) @@ -429,6 +430,7 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) const struct vsock_transport *new_transport; struct sock *sk = sk_vsock(vsk); unsigned int remote_cid = vsk->remote_addr.svm_cid; + unsigned short remote_flags; int ret; /* If the packet is coming with the source and destination CIDs higher @@ -443,6 +445,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) vsk->remote_addr.svm_cid > VMADDR_CID_HOST) vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; + remote_flags = vsk->remote_addr.svm_flags; + switch (sk->sk_type) { case SOCK_DGRAM: new_transport = transport_dgram; @@ -450,7 +454,8 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) case SOCK_STREAM: if (vsock_use_local_transport(remote_cid)) new_transport = transport_local; - else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g) + else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || + (remote_flags & VMADDR_FLAG_TO_HOST) == VMADDR_FLAG_TO_HOST) new_transport = transport_g2h; else new_transport = transport_h2g;
The vsock flags field can be set in the connect and (listen) receive paths. When the vsock transport is assigned, the remote CID is used to distinguish between types of connection. Use the vsock flags value (in addition to the CID) from the remote address to decide which vsock transport to assign. For the sibling VMs use case, all the vsock packets need to be forwarded to the host, so always assign the guest->host transport if the VMADDR_FLAG_TO_HOST flag is set. For the other use cases, the vsock transport assignment logic is not changed. Changelog v1 -> v2 * Use bitwise operator to check the vsock flag. * Use the updated "VMADDR_FLAG_TO_HOST" flag naming. * Merge the checks for the g2h transport assignment in one "if" block. Signed-off-by: Andra Paraschiv <andraprs@amazon.com> --- net/vmw_vsock/af_vsock.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)