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Handle multi-sector reads by splitting them into subcommands.

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This commit is contained in:
Michael Brown
2006-05-29 08:25:31 +00:00
parent 9a2a52693d
commit 6541338897
4 changed files with 54 additions and 3 deletions
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50
src/net/aoe.c
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@@ -84,7 +84,7 @@ static int aoe_send_command ( struct aoe_session *aoe ) {
aoecmd->cmd_stat = command->cb.cmd_stat;
aoecmd->lba.u64 = cpu_to_le64 ( command->cb.lba.native );
if ( ! command->cb.lba48 )
aoecmd->lba.bytes[3] |= command->cb.device;
aoecmd->lba.bytes[3] |= ( command->cb.device & ATA_DEV_MASK );
/* Fill data payload */
copy_from_user ( pkb_put ( pkb, command->data_out_len ),
@@ -244,8 +244,11 @@ void aoe_kick ( struct aoe_session *aoe ) {
* Issue ATA command via an open AoE session
*
* @v aoe AoE session
* @v command AoE command
* @v command ATA command
* @ret rc Return status code
*
* The ATA command must fit within a single AoE frame (i.e. the sector
* count must not exceed AOE_MAX_COUNT).
*/
int aoe_issue ( struct aoe_session *aoe, struct ata_command *command ) {
aoe->command = command;
@@ -259,3 +262,46 @@ int aoe_issue ( struct aoe_session *aoe, struct ata_command *command ) {
return ( ( aoe->status & AOE_STATUS_ERR_MASK ) ? -EIO : 0 );
}
/**
* Issue ATA command via an open AoE session
*
* @v aoe AoE session
* @v command ATA command
* @ret rc Return status code
*
* The ATA command will be split into several smaller ATA commands,
* each with a sector count no larger than AOE_MAX_COUNT.
*/
int aoe_issue_split ( struct aoe_session *aoe, struct ata_command *command ) {
struct ata_command subcommand;
unsigned int offset;
unsigned int count;
unsigned int data_len;
unsigned int status = 0;
int rc = 0;
/* Split ATA command into AoE-sized subcommands */
for ( offset = 0; offset < command->cb.count.native; offset += count ){
memcpy ( &subcommand, command, sizeof ( subcommand ) );
count = ( command->cb.count.native - offset );
if ( count > AOE_MAX_COUNT )
count = AOE_MAX_COUNT;
data_len = count * ATA_SECTOR_SIZE;
if ( subcommand.data_in_len )
subcommand.data_in_len = data_len;
if ( subcommand.data_out_len )
subcommand.data_out_len = data_len;
aoe->command_offset = ( offset * ATA_SECTOR_SIZE );
subcommand.cb.lba.native += offset;
subcommand.cb.count.native = count;
if ( ( rc = aoe_issue ( aoe, &subcommand ) ) != 0 )
goto done;
status |= subcommand.cb.cmd_stat;
}
command->cb.cmd_stat = status;
done:
aoe->command_offset = 0;
return rc;
}