linux/drivers/vhost, branch v3.16

vhost-scsi: don't open-code kvfree

2014-06-23T06:22:48Z

Now that we have kvfree, use it in vhost-scsi instead of the open-coded version. Cc: Nicholas Bellinger Signed-off-by: Michael S. Tsirkin

vhost-net: don't open-code kvfree

2014-06-23T06:22:48Z

Commit 23cc5a991c ("vhost-net: extend device allocation to vmalloc") added another open-coded version of kvfree (which is available since v3.15-rc5), nuke it. Signed-off-by: Romain Francoise Signed-off-by: Michael S. Tsirkin

Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

2014-06-13T05:38:32Z

Pull SCSI target updates from Nicholas Bellinger: "The highlights this round include: - Add support for T10 PI pass-through between vhost-scsi + virtio-scsi (MST + Paolo + MKP + nab) - Add support for T10 PI in qla2xxx target mode (Quinn + MKP + hch + nab, merged through scsi.git) - Add support for percpu-ida pre-allocation in qla2xxx target code (Quinn + nab) - A number of iser-target fixes related to hardening the network portal shutdown path (Sagi + Slava) - Fix response length residual handling for a number of control CDBs (Roland + Christophe V.) - Various iscsi RFC conformance fixes in the CHAP authentication path (Tejas and Calsoft folks + nab) - Return TASK_SET_FULL status for tcm_fc(FCoE) DataIn + Response failures (Vasu + Jun + nab) - Fix long-standing ABORT_TASK + session reset hang (nab) - Convert iser-initiator + iser-target to include T10 bytes into EDTL (Sagi + Or + MKP + Mike Christie) - Fix NULL pointer dereference regression related to XCOPY introduced in v3.15 + CC'ed to v3.12.y (nab)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (34 commits) target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd vhost-scsi: Include prot_bytes into expected data transfer length TARGET/sbc,loopback: Adjust command data length in case pi exists on the wire libiscsi, iser: Adjust data_length to include protection information scsi_cmnd: Introduce scsi_transfer_length helper target: Report correct response length for some commands target/sbc: Check that the LBA and number of blocks are correct in VERIFY target/sbc: Remove sbc_check_valid_sectors() Target/iscsi: Fix sendtargets response pdu for iser transport Target/iser: Fix a wrong dereference in case discovery session is over iser iscsi-target: Fix ABORT_TASK + connection reset iscsi_queue_req memory leak target: Use complete_all for se_cmd->t_transport_stop_comp target: Set CMD_T_ACTIVE bit for Task Management Requests target: cleanup some boolean tests target/spc: Simplify INQUIRY EVPD=0x80 tcm_fc: Generate TASK_SET_FULL status for response failures tcm_fc: Generate TASK_SET_FULL status for DataIN failures iscsi-target: Reject mutual authentication with reflected CHAP_C iscsi-target: Remove no-op from iscsit_tpg_del_portal_group iscsi-target: Fix CHAP_A parameter list handling ...

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2014-06-12T00:08:16Z

Pull vhost infrastructure updates from Michael S. Tsirkin: "This reworks vhost core dropping unnecessary RCU uses in favor of VQ mutexes which are used on fast path anyway. This fixes worst-case latency for users which change the memory mappings a lot. Memory allocation for vhost-net now supports fallback on vmalloc (same as for vhost-scsi) this makes it possible to create the device on systems where memory is very fragmented, with slightly lower performance" * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: vhost: move memory pointer to VQs vhost: move acked_features to VQs vhost: replace rcu with mutex vhost-net: extend device allocation to vmalloc

vhost-scsi: Include prot_bytes into expected data transfer length

2014-06-11T20:06:50Z

This patch updates vhost_scsi_get_tag() to accept the combined expected data transfer length + T10 PI bytes as the value passed into target_submit_cmd(). This is required now that target-core logic in commit 14ef9200 expects to subtract se_cmd->prot_length from se_cmd->data_length. Cc: Paolo Bonzini Cc: Michael S. Tsirkin Cc: Martin K. Petersen Cc: Sagi Grimberg Signed-off-by: Nicholas Bellinger

vhost: move memory pointer to VQs

2014-06-09T13:21:07Z

commit 2ae76693b8bcabf370b981cd00c36cd41d33fabc vhost: replace rcu with mutex replaced rcu sync for memory accesses with VQ mutex locl/unlock. This is correct since all accesses are under VQ mutex, but incomplete: we still do useless rcu lock/unlock operations, someone might copy this code into some other context where this won't be right. This use of RCU is also non standard and hard to understand. Let's copy the pointer to each VQ structure, this way the access rules become straight-forward, and there's no need for RCU anymore. Reported-by: Eric Dumazet Signed-off-by: Michael S. Tsirkin

vhost: move acked_features to VQs

2014-06-09T13:21:06Z

Refactor code to make sure features are only accessed under VQ mutex. This makes everything simpler, no need for RCU here anymore. Signed-off-by: Michael S. Tsirkin

vhost: replace rcu with mutex

2014-06-09T13:21:06Z

All memory accesses are done under some VQ mutex. So lock/unlock all VQs is a faster equivalent of synchronize_rcu() for memory access changes. Some guests cause a lot of these changes, so it's helpful to make them faster. Reported-by: "Gonglei (Arei)" Signed-off-by: Michael S. Tsirkin

vhost-net: extend device allocation to vmalloc

2014-06-09T13:21:05Z

Michael Mueller provided a patch to reduce the size of vhost-net structure as some allocations could fail under memory pressure/fragmentation. We are still left with high order allocations though. This patch is handling the problem at the core level, allowing vhost structures to use vmalloc() if kmalloc() failed. As vmalloc() adds overhead on a critical network path, add __GFP_REPEAT to kzalloc() flags to do this fallback only when really needed. People are still looking at cleaner ways to handle the problem at the API level, probably passing in multiple iovecs. This hack seems consistent with approaches taken since then by drivers/vhost/scsi.c and net/core/dev.c Based on patch by Romain Francoise. Cc: Michael Mueller Signed-off-by: Romain Francoise Acked-by: Michael S. Tsirkin

vhost/scsi: Enable T10 PI IOV -> SGL memory mapping

2014-06-02T19:42:14Z

This patch updates vhost_scsi_handle_vq() to check for the existance of virtio_scsi_cmd_req_pi comparing vq->iov[0].iov_len in order to calculate seperate data + protection SGLs from data_num. Also update tcm_vhost_submission_work() to pass the pre-allocated cmd->tvc_prot_sgl[] memory into target_submit_cmd_map_sgls(), and update vhost_scsi_get_tag() parameters to accept scsi_tag, lun, and task_attr. Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: H. Peter Anvin Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger