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authorMing Lei <ming.lei@redhat.com>2019-04-28 09:39:30 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2019-06-20 21:21:33 +0200
commit4635873c561ac57b66adfcc2487c38106b1c916c (patch)
tree328c277fd811943ccf9e8b619e13397009c7f3e6 /drivers/nvme/host/fc.c
parentscsi: esp: use sg helper to iterate over scatterlist (diff)
downloadlinux-4635873c561ac57b66adfcc2487c38106b1c916c.tar.xz
linux-4635873c561ac57b66adfcc2487c38106b1c916c.zip
scsi: lib/sg_pool.c: improve APIs for allocating sg pool
sg_alloc_table_chained() currently allows the caller to provide one preallocated SGL and returns if the requested number isn't bigger than size of that SGL. This is used to inline an SGL for an IO request. However, scattergather code only allows that size of the 1st preallocated SGL to be SG_CHUNK_SIZE(128). This means a substantial amount of memory (4KB) is claimed for the SGL for each IO request. If the I/O is small, it would be prudent to allocate a smaller SGL. Introduce an extra parameter to sg_alloc_table_chained() and sg_free_table_chained() for specifying size of the preallocated SGL. Both __sg_free_table() and __sg_alloc_table() assume that each SGL has the same size except for the last one. Change the code to allow both functions to accept a variable size for the 1st preallocated SGL. [mkp: attempted to clarify commit desc] Cc: Christoph Hellwig <hch@lst.de> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Ewan D. Milne <emilne@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: netdev@vger.kernel.org Cc: linux-nvme@lists.infradead.org Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/nvme/host/fc.c')
-rw-r--r--drivers/nvme/host/fc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index dd8169bbf0d2..46811caac9d2 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2112,7 +2112,8 @@ nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
freq->sg_table.sgl = freq->first_sgl;
ret = sg_alloc_table_chained(&freq->sg_table,
- blk_rq_nr_phys_segments(rq), freq->sg_table.sgl);
+ blk_rq_nr_phys_segments(rq), freq->sg_table.sgl,
+ SG_CHUNK_SIZE);
if (ret)
return -ENOMEM;
@@ -2122,7 +2123,7 @@ nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl,
op->nents, dir);
if (unlikely(freq->sg_cnt <= 0)) {
- sg_free_table_chained(&freq->sg_table, true);
+ sg_free_table_chained(&freq->sg_table, SG_CHUNK_SIZE);
freq->sg_cnt = 0;
return -EFAULT;
}
@@ -2148,7 +2149,7 @@ nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
nvme_cleanup_cmd(rq);
- sg_free_table_chained(&freq->sg_table, true);
+ sg_free_table_chained(&freq->sg_table, SG_CHUNK_SIZE);
freq->sg_cnt = 0;
}