sfxge: erase nvram partitions in chunks equal to their erase size

The erase size is reported by the nvram info command.

Submitted by:   Paul Fox <pfox at solarflare.com>
Reviewed by:    gnn
Sponsored by:   Solarflare Communications, Inc.
MFC after:      2 days
Differential Revision: https://reviews.freebsd.org/D4386

1 files changed, 26 insertions, 1 deletions

diff --git a/sys/dev/sfxge/common/hunt_nvram.c b/sys/dev/sfxge/common/hunt_nvram.c
index c32f8ab..341a31b 100644
--- a/sys/dev/sfxge/common/hunt_nvram.c
+++ b/sys/dev/sfxge/common/hunt_nvram.c
@@ -1363,12 +1363,37 @@ hunt_nvram_partn_erase(
 	__in			size_t size)
 {
 	efx_rc_t rc;
+	uint32_t erase_size;
 
-	if ((rc = efx_mcdi_nvram_erase(enp, partn, offset, size)) != 0)
+	if ((rc = efx_mcdi_nvram_info(enp, partn, NULL, NULL,
+	    &erase_size, NULL)) != 0)
 		goto fail1;
 
+	if (erase_size == 0) {
+		if ((rc = efx_mcdi_nvram_erase(enp, partn, offset, size)) != 0)
+			goto fail2;
+	} else {
+		if (size % erase_size != 0) {
+			rc = EINVAL;
+			goto fail3;
+		}
+		while (size > 0) {
+			if ((rc = efx_mcdi_nvram_erase(enp, partn, offset,
+			    erase_size)) != 0)
+				goto fail4;
+			offset += erase_size;
+			size -= erase_size;
+		}
+	}
+
 	return (0);
 
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
 fail1:
 	EFSYS_PROBE1(fail1, efx_rc_t, rc);