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nvmet-fc: simplify sg list handling

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The existing nvmet_fc sg list handling has 2 faults:
a) the request between LLDD and transport has too large of an sg
   list (256 elements), which is normally 256k (64 elements).
b) sglist handling doesn't optimize on the fact that each element
   is a page.

This patch removes the static sg list in the request and uses the
dynamic list already present in the nvmet_fc transport. It also
simplies the handling of the sg list on multiple sequences to
take advantage of the per-page divisions.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart
2017-07-31 13:21:14 -07:00
committed by Sagi Grimberg
parent 5533d42480
commit 48fa362b6c
2 changed files with 11 additions and 39 deletions
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2
include/linux/nvme-fc-driver.h
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@@ -624,7 +624,7 @@ struct nvmefc_tgt_fcp_req {
u32 timeout;
u32 transfer_length;
struct fc_ba_rjt ba_rjt;
struct scatterlist sg[NVME_FC_MAX_SEGMENTS];
struct scatterlist *sg;
int sg_cnt;
void *rspaddr;
dma_addr_t rspdma;