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[2/4] RDMA/core: introduce check masks for T10-PI offload

Message ID 1527753926-18593-3-git-send-email-maxg@mellanox.com (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show

Commit Message

Max Gurtovoy May 31, 2018, 8:05 a.m. UTC 
T10-PI offload capability is currently supported in iSER protocol only,
and the definition of the HCA protection information checks are missing
from the core layer. Add those definition to avoid code duplication in
other drivers (such iSER target and NVMeoF).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
---
 include/rdma/ib_verbs.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 9fc8a82..d084b89 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -861,6 +861,19 @@  enum ib_sig_err_type {
 };
 
 /**
+ * Signature check masks (8 bytes in total) according to the T10-PI standard:
+ *  -------- -------- ------------
+ * | GUARD  | APPTAG |   REFTAG   |
+ * |  2B    |  2B    |    4B      |
+ *  -------- -------- ------------
+ */
+enum {
+	IB_SIG_CHECK_GUARD	= 0xc0,
+	IB_SIG_CHECK_APPTAG	= 0x30,
+	IB_SIG_CHECK_REFTAG	= 0x0f,
+};
+
+/**
  * struct ib_sig_err - signature error descriptor
  */
 struct ib_sig_err {