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| author | Chuck Lever <chuck.lever@oracle.com> | 2026-01-27 19:53:59 -0500 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2026-01-28 05:54:53 -0500 |
| commit | afcae7d7b8a278a6c29e064f99e5bafd4ac1fb37 (patch) | |
| tree | 2d3840b87c5954450daf3c1f7c83dcde9e55cd93 /include | |
| parent | bea28ac14cab25d79ea759138def79aa82e0b428 (diff) | |
RDMA/core: add rdma_rw_max_sge() helper for SQ sizing
svc_rdma_accept() computes sc_sq_depth as the sum of rq_depth and the
number of rdma_rw contexts (ctxts). This value is used to allocate the
Send CQ and to initialize the sc_sq_avail credit pool.
However, when the device uses memory registration for RDMA operations,
rdma_rw_init_qp() inflates the QP's max_send_wr by a factor of three
per context to account for REG and INV work requests. The Send CQ and
credit pool remain sized for only one work request per context,
causing Send Queue exhaustion under heavy NFS WRITE workloads.
Introduce rdma_rw_max_sge() to compute the actual number of Send Queue
entries required for a given number of rdma_rw contexts. Upper layer
protocols call this helper before creating a Queue Pair so that their
Send CQs and credit accounting match the QP's true capacity.
Update svc_rdma_accept() to use rdma_rw_max_sge() when computing
sc_sq_depth, ensuring the credit pool reflects the work requests
that rdma_rw_init_qp() will reserve.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixes: 00bd1439f464 ("RDMA/rw: Support threshold for registration vs scattering to local pages")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://patch.msgid.link/20260128005400.25147-5-cel@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/rdma/rw.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/rdma/rw.h b/include/rdma/rw.h index 3400c017bfb6..6a1d08614e09 100644 --- a/include/rdma/rw.h +++ b/include/rdma/rw.h @@ -86,6 +86,8 @@ int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num, unsigned int rdma_rw_mr_factor(struct ib_device *device, u32 port_num, unsigned int maxpages); +unsigned int rdma_rw_max_send_wr(struct ib_device *dev, u32 port_num, + unsigned int max_rdma_ctxs, u32 create_flags); void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); void rdma_rw_cleanup_mrs(struct ib_qp *qp); |