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Subject[PATCH v2 01/11] firewire: Add function to get speed from opaque struct fw_request
Sometimes it's useful to know the FireWire speed of the request that has
just come in to a fw_address_handler callback. As struct fw_request is
opaque we can't peek inside to get the speed out of the struct fw_packet
that's just inside. For example, the SBP-2 spec says:

"The speed at which the block write request to the MANAGEMENT_AGENT
register is received shall determine the speed used by the target for
all subsequent requests to read the initiator’s configuration ROM, fetch
ORB’s from initiator memory or store status at the initiator’s
status_FIFO. Command block ORB’s separately specify the speed for
requests addressed to the data buffer or page table."

[ ANSI T10/1155D Revision 4 page 53/54 ]

Signed-off-by: Chris Boot <>
Acked-by: Stefan Richter <>
Cc: Clemens Ladisch <>
drivers/firewire/core-transaction.c | 16 ++++++++++++++++
include/linux/firewire.h | 1 +
2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 855ab3f..614f592 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -820,6 +820,22 @@ void fw_send_response(struct fw_card *card,

+ * fw_get_request_speed() - Discover bus speed used for this request
+ * @request: The struct fw_request from which to obtain the speed.
+ *
+ * In certain circumstances it's important to be able to obtain the speed at
+ * which a request was made to an address handler, for example when
+ * implementing an SBP-2 or SBP-3 target. This function inspects the response
+ * object to obtain the speed, which is copied from the request packet in
+ * allocate_request().
+ */
+int fw_get_request_speed(struct fw_request *request)
+ return request->response.speed;
static void handle_exclusive_region_request(struct fw_card *card,
struct fw_packet *p,
struct fw_request *request,
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index 84ccf8e..f010307 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -340,6 +340,7 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
void fw_core_remove_address_handler(struct fw_address_handler *handler);
void fw_send_response(struct fw_card *card,
struct fw_request *request, int rcode);
+int fw_get_request_speed(struct fw_request *request);
void fw_send_request(struct fw_card *card, struct fw_transaction *t,
int tcode, int destination_id, int generation, int speed,
unsigned long long offset, void *payload, size_t length,
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