Commit 8b0d2f9e authored by Bjørn Mork's avatar Bjørn Mork Committed by David S. Miller

net: e100: ucode is optional in some cases

commit 9ac32e1b firmware: convert e100 driver to request_firmware()

did a straight conversion of the in-driver ucode to external
files.  This introduced the possibility of the driver failing
to enable an interface due to missing ucode. There was no
evaluation of the importance of the ucode at the time.

Based on comments in earlier versions of this driver, and in
the source code for the FreeBSD fxp driver, we can assume that
the ucode implements the "CPU Cycle Saver" feature on supported
adapters.  Although generally wanted, this is an optional
feature. The ucode source is not available, preventing it from
being included in free distributions. This creates unnecessary
problems for the end users. Doing a network install based on a
free distribution installer requires the user to download and
insert the ucode into the installer.

Making the ucode optional when possible improves the user
experience and driver usability.

The ucode for some adapters include a bugfix, making it
essential.  We continue to fail for these adapters unless the
ucode is available.
Signed-off-by: default avatarBjørn Mork <bjorn@mork.no>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 21502937
...@@ -1249,20 +1249,35 @@ static const struct firmware *e100_request_firmware(struct nic *nic) ...@@ -1249,20 +1249,35 @@ static const struct firmware *e100_request_firmware(struct nic *nic)
const struct firmware *fw = nic->fw; const struct firmware *fw = nic->fw;
u8 timer, bundle, min_size; u8 timer, bundle, min_size;
int err = 0; int err = 0;
bool required = false;
/* do not load u-code for ICH devices */ /* do not load u-code for ICH devices */
if (nic->flags & ich) if (nic->flags & ich)
return NULL; return NULL;
/* Search for ucode match against h/w revision */ /* Search for ucode match against h/w revision
if (nic->mac == mac_82559_D101M) *
* Based on comments in the source code for the FreeBSD fxp
* driver, the FIRMWARE_D102E ucode includes both CPUSaver and
*
* "fixes for bugs in the B-step hardware (specifically, bugs
* with Inline Receive)."
*
* So we must fail if it cannot be loaded.
*
* The other microcode files are only required for the optional
* CPUSaver feature. Nice to have, but no reason to fail.
*/
if (nic->mac == mac_82559_D101M) {
fw_name = FIRMWARE_D101M; fw_name = FIRMWARE_D101M;
else if (nic->mac == mac_82559_D101S) } else if (nic->mac == mac_82559_D101S) {
fw_name = FIRMWARE_D101S; fw_name = FIRMWARE_D101S;
else if (nic->mac == mac_82551_F || nic->mac == mac_82551_10) } else if (nic->mac == mac_82551_F || nic->mac == mac_82551_10) {
fw_name = FIRMWARE_D102E; fw_name = FIRMWARE_D102E;
else /* No ucode on other devices */ required = true;
} else { /* No ucode on other devices */
return NULL; return NULL;
}
/* If the firmware has not previously been loaded, request a pointer /* If the firmware has not previously been loaded, request a pointer
* to it. If it was previously loaded, we are reinitializing the * to it. If it was previously loaded, we are reinitializing the
...@@ -1273,10 +1288,17 @@ static const struct firmware *e100_request_firmware(struct nic *nic) ...@@ -1273,10 +1288,17 @@ static const struct firmware *e100_request_firmware(struct nic *nic)
err = request_firmware(&fw, fw_name, &nic->pdev->dev); err = request_firmware(&fw, fw_name, &nic->pdev->dev);
if (err) { if (err) {
if (required) {
netif_err(nic, probe, nic->netdev, netif_err(nic, probe, nic->netdev,
"Failed to load firmware \"%s\": %d\n", "Failed to load firmware \"%s\": %d\n",
fw_name, err); fw_name, err);
return ERR_PTR(err); return ERR_PTR(err);
} else {
netif_info(nic, probe, nic->netdev,
"CPUSaver disabled. Needs \"%s\": %d\n",
fw_name, err);
return NULL;
}
} }
/* Firmware should be precisely UCODE_SIZE (words) plus three bytes /* Firmware should be precisely UCODE_SIZE (words) plus three bytes
......
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