The change is good, however, I don't think this was really the problem.
We would like to know if this patch really solved an issue they observed.
A good data point to know is what adapter they're using.
If that adapter supports hybrid sgl (i.e. phba->cfg_xpsgl), then we
would have set the max sg_tablesize = LPFC_MAX_SG_TABLESIZE = 0xffff.
But even then, this patch implies that dma_map_sg() returned a crazy
huge amount with the MSB set.
A good data point to know is what adapter they're using.
If that adapter supports hybrid sgl (i.e. phba->cfg_xpsgl), then we
would have set the max sg_tablesize = LPFC_MAX_SG_TABLESIZE = 0xffff.
But even then, this patch implies that dma_map_sg() returned a crazy
huge amount with the MSB set.
On Wed, Dec 20, 2023 at 8:29 AM Daniel Wagner <dwagner@xxxxxxx> wrote:
From: Hannes Reinecke <hare@xxxxxxx>
LUNs going into “failed ready running” state observed on >1T and on
even numbers of size (2T, 4T, 6T, 8T and 10T). The issue occurs when
DIF is enabled at the host.
The kernel logs:
Cannot setup S/G List for HBAIO segs 1/1 SGL 512 SCSI 256: 3 0
The host lpfc driver is failing to setup scatter/gather list
(protection data) for the IO's.
The return type lpfc_bg_setup_sgl()/lpfc_bg_setup_sgl_prot() causes
the compiler to remove the most significant bit. Use an unsigned type
instead.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
[dwagner: added commit message]
Signed-off-by: Daniel Wagner <dwagner@xxxxxxx>
---
drivers/scsi/lpfc/lpfc_scsi.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index d26941b131fd..bf879d81846b 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -1918,7 +1918,7 @@ lpfc_bg_setup_bpl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
*
* Returns the number of SGEs added to the SGL.
**/
-static int
+static uint32_t
lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
struct sli4_sge *sgl, int datasegcnt,
struct lpfc_io_buf *lpfc_cmd)
@@ -1926,8 +1926,8 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
struct scatterlist *sgde = NULL; /* s/g data entry */
struct sli4_sge_diseed *diseed = NULL;
dma_addr_t physaddr;
- int i = 0, num_sge = 0, status;
- uint32_t reftag;
+ int i = 0, status;
+ uint32_t reftag, num_sge = 0;
uint8_t txop, rxop;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
uint32_t rc;
@@ -2099,7 +2099,7 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
*
* Returns the number of SGEs added to the SGL.
**/
-static int
+static uint32_t
lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
struct sli4_sge *sgl, int datacnt, int protcnt,
struct lpfc_io_buf *lpfc_cmd)
@@ -2123,8 +2123,8 @@ lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
uint32_t rc;
#endif
uint32_t checking = 1;
- uint32_t dma_offset = 0;
- int num_sge = 0, j = 2;
+ uint32_t dma_offset = 0, num_sge = 0;
+ int j = 2;
struct sli4_hybrid_sgl *sgl_xtra = NULL;
sgpe = scsi_prot_sglist(sc);
--
2.43.0
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