scsi: qla2xxx: Add ability to autodetect SFP type

SFP can come in 2 formats: short range/SR and long range/LR.  For LR,
user the can increase the number of Buffer to Buffer credits between end
points via Cavium's command line tool.  By default, FW uses a lower BB
Credit value optimized for SR.  This patch will read the SFP for each
link up event and during chip reset sequence. If the SFP type and
setting are mismatch, then the chip is reset 1 time to use the
appropriate setting.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 6 insertions, 36 deletions

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 08a1feb3a195..9d2862233e3c 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -565,47 +565,17 @@ qla2x00_sysfs_read_sfp(struct file *filp, struct kobject *kobj,
 {
 	struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
-	struct qla_hw_data *ha = vha->hw;
-	uint16_t iter, addr, offset;
 	int rval;
 
-	if (!capable(CAP_SYS_ADMIN) || off != 0 || count != SFP_DEV_SIZE * 2)
+	if (!capable(CAP_SYS_ADMIN) || off != 0 || count < SFP_DEV_SIZE)
 		return 0;
 
-	if (ha->sfp_data)
-		goto do_read;
-
-	ha->sfp_data = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL,
-	    &ha->sfp_data_dma);
-	if (!ha->sfp_data) {
-		ql_log(ql_log_warn, vha, 0x706c,
-		    "Unable to allocate memory for SFP read-data.\n");
+	if (qla2x00_reset_active(vha))
 		return 0;
-	}
-
-do_read:
-	memset(ha->sfp_data, 0, SFP_BLOCK_SIZE);
-	addr = 0xa0;
-	for (iter = 0, offset = 0; iter < (SFP_DEV_SIZE * 2) / SFP_BLOCK_SIZE;
-	    iter++, offset += SFP_BLOCK_SIZE) {
-		if (iter == 4) {
-			/* Skip to next device address. */
-			addr = 0xa2;
-			offset = 0;
-		}
-
-		rval = qla2x00_read_sfp(vha, ha->sfp_data_dma, ha->sfp_data,
-		    addr, offset, SFP_BLOCK_SIZE, BIT_1);
-		if (rval != QLA_SUCCESS) {
-			ql_log(ql_log_warn, vha, 0x706d,
-			    "Unable to read SFP data (%x/%x/%x).\n", rval,
-			    addr, offset);
 
-			return -EIO;
-		}
-		memcpy(buf, ha->sfp_data, SFP_BLOCK_SIZE);
-		buf += SFP_BLOCK_SIZE;
-	}
+	rval = qla2x00_read_sfp_dev(vha, buf, count);
+	if (rval)
+		return -EIO;
 
 	return count;
 }
@@ -615,7 +585,7 @@ static struct bin_attribute sysfs_sfp_attr = {
 		.name = "sfp",
 		.mode = S_IRUSR | S_IWUSR,
 	},
-	.size = SFP_DEV_SIZE * 2,
+	.size = SFP_DEV_SIZE,
 	.read = qla2x00_sysfs_read_sfp,
 };