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idxd: zero out descriptor before use

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To avoid re-use of descriptors that may have fields set that are
reserved by the one being used now.  For example:

If a batch desc is being built and was previously used by a copy
we need to clear out the dst_addr field or things will explode
as this is a reserved field for a batch.

Signed-off-by: paul luse <paul.e.luse@intel.com>
Change-Id: I6ba50b76589e38a276683291f5ec2970c80e8aa8
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/11308
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
paul luse 2022-01-27 13:36:51 +00:00 committed by Jim Harris
parent 08f9b40113
commit 057fdedbff
1 changed files with 4 additions and 2 deletions
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6
lib/idxd/idxd.c
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@ -358,10 +358,14 @@ _idxd_prep_command(struct spdk_idxd_io_channel *chan, spdk_idxd_req_cb cb_fn,
{
struct idxd_hw_desc *desc;
struct idxd_ops *op;
uint64_t comp_addr;
if (!TAILQ_EMPTY(&chan->ops_pool)) {
op = *_op = TAILQ_FIRST(&chan->ops_pool);
desc = *_desc = op->desc;
comp_addr = desc->completion_addr;
memset(desc, 0, sizeof(*desc));
desc->completion_addr = comp_addr;
TAILQ_REMOVE(&chan->ops_pool, op, link);
} else {
/* The application needs to handle this, violation of flow control */
@ -983,7 +987,6 @@ _idxd_submit_crc32c_single(struct spdk_idxd_io_channel *chan, uint32_t *crc_dst,
/* Command specific. */
desc->opcode = IDXD_OPCODE_CRC32C_GEN;
desc->dst_addr = 0; /* Per spec, needs to be clear. */
desc->src_addr = src_addr;
desc->flags &= IDXD_CLEAR_CRC_FLAGS;
desc->crc32c.seed = seed;
@ -1042,7 +1045,6 @@ spdk_idxd_submit_crc32c(struct spdk_idxd_io_channel *chan,
}
desc->opcode = IDXD_OPCODE_CRC32C_GEN;
desc->dst_addr = 0; /* Per spec, needs to be clear. */
desc->src_addr = src_addr;
if (i == 0) {
desc->crc32c.seed = seed;