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bnxt_en: Check TQM rings for maximum supported value. 

TQM rings are hardware resources that require host context memory
managed by the driver.  The driver supports up to 9 TQM rings and
the number of rings to use is requested by firmware during run-time.
Cap this number to the maximum supported to prevent accessing beyond
the array.  Future firmware may request more than 9 TQM rings.  Define
macros to remove the magic number 9 from the C code.

Fixes: ac3158cb01 ("bnxt_en: Allocate TQM ring context memory according to fw specification.")
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Chan 2020-12-27 14:18:18 -05:00 committed by Jakub Kicinski
parent fb1e6e562b
commit a029a2fef5
2 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -6790,8 +6790,10 @@ static int bnxt_hwrm_func_backing_store_qcaps(struct bnxt *bp)
ctx->tqm_fp_rings_count = resp->tqm_fp_rings_count;
if (!ctx->tqm_fp_rings_count)
ctx->tqm_fp_rings_count = bp->max_q;
else if (ctx->tqm_fp_rings_count > BNXT_MAX_TQM_FP_RINGS)
ctx->tqm_fp_rings_count = BNXT_MAX_TQM_FP_RINGS;
tqm_rings = ctx->tqm_fp_rings_count + 1;
tqm_rings = ctx->tqm_fp_rings_count + BNXT_MAX_TQM_SP_RINGS;
ctx_pg = kcalloc(tqm_rings, sizeof(*ctx_pg), GFP_KERNEL);
if (!ctx_pg) {
kfree(ctx);
@ -6925,7 +6927,8 @@ static int bnxt_hwrm_func_backing_store_cfg(struct bnxt *bp, u32 enables)
pg_attr = &req.tqm_sp_pg_size_tqm_sp_lvl,
pg_dir = &req.tqm_sp_page_dir,
ena = FUNC_BACKING_STORE_CFG_REQ_ENABLES_TQM_SP;
i < 9; i++, num_entries++, pg_attr++, pg_dir++, ena <<= 1) {
i < BNXT_MAX_TQM_RINGS;
i++, num_entries++, pg_attr++, pg_dir++, ena <<= 1) {
if (!(enables & ena))
continue;

7
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -1436,6 +1436,11 @@ struct bnxt_ctx_pg_info {
struct bnxt_ctx_pg_info **ctx_pg_tbl;
};
#define BNXT_MAX_TQM_SP_RINGS 1
#define BNXT_MAX_TQM_FP_RINGS 8
#define BNXT_MAX_TQM_RINGS \
(BNXT_MAX_TQM_SP_RINGS + BNXT_MAX_TQM_FP_RINGS)
struct bnxt_ctx_mem_info {
u32 qp_max_entries;
u16 qp_min_qp1_entries;
@ -1474,7 +1479,7 @@ struct bnxt_ctx_mem_info {
struct bnxt_ctx_pg_info stat_mem;
struct bnxt_ctx_pg_info mrav_mem;
struct bnxt_ctx_pg_info tim_mem;
struct bnxt_ctx_pg_info *tqm_mem[9];
struct bnxt_ctx_pg_info *tqm_mem[BNXT_MAX_TQM_RINGS];
};
struct bnxt_fw_health {