From: Long Li <longli@microsoft.com>
Date: Thu, 3 Nov 2022 12:16:26 -0700
Subject: net: mana: Define max values for SGL entries
Patch-mainline: v6.2-rc1
Git-commit: aa56549792fb348892fbbae67f6f0c71bb750b65
References: bsc#1210741 jsc#PED-4022
The number of maximum SGl entries should be computed from the maximum
WQE size for the intended queue type and the corresponding OOB data
size. This guarantees the hardware queue can successfully queue requests
up to the queue depth exposed to the upper layer.
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Long Li <longli@microsoft.com>
Link: https://lore.kernel.org/r/1667502990-2559-9-git-send-email-longli@linuxonhyperv.com
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 2 +-
include/net/mana/gdma.h | 7 +++++++
include/net/mana/mana.h | 4 +---
3 files changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -187,7 +187,7 @@ int mana_start_xmit(struct sk_buff *skb,
pkg.wqe_req.client_data_unit = 0;
pkg.wqe_req.num_sge = 1 + skb_shinfo(skb)->nr_frags;
- WARN_ON_ONCE(pkg.wqe_req.num_sge > 30);
+ WARN_ON_ONCE(pkg.wqe_req.num_sge > MAX_TX_WQE_SGL_ENTRIES);
if (pkg.wqe_req.num_sge <= ARRAY_SIZE(pkg.sgl_array)) {
pkg.wqe_req.sgl = pkg.sgl_array;
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -428,6 +428,13 @@ struct gdma_wqe {
#define MAX_TX_WQE_SIZE 512
#define MAX_RX_WQE_SIZE 256
+#define MAX_TX_WQE_SGL_ENTRIES ((GDMA_MAX_SQE_SIZE - \
+ sizeof(struct gdma_sge) - INLINE_OOB_SMALL_SIZE) / \
+ sizeof(struct gdma_sge))
+
+#define MAX_RX_WQE_SGL_ENTRIES ((GDMA_MAX_RQE_SIZE - \
+ sizeof(struct gdma_sge)) / sizeof(struct gdma_sge))
+
struct gdma_cqe {
u32 cqe_data[GDMA_COMP_DATA_SIZE / 4];
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -265,8 +265,6 @@ struct mana_cq {
int budget;
};
-#define GDMA_MAX_RQE_SGES 15
-
struct mana_recv_buf_oob {
/* A valid GDMA work request representing the data buffer. */
struct gdma_wqe_request wqe_req;
@@ -276,7 +274,7 @@ struct mana_recv_buf_oob {
/* SGL of the buffer going to be sent has part of the work request. */
u32 num_sge;
- struct gdma_sge sgl[GDMA_MAX_RQE_SGES];
+ struct gdma_sge sgl[MAX_RX_WQE_SGL_ENTRIES];
/* Required to store the result of mana_gd_post_work_request.
* gdma_posted_wqe_info.wqe_size_in_bu is required for progressing the